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Diffstat (limited to 'libpthread/linuxthreads')
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diff --git a/libpthread/linuxthreads/Changes b/libpthread/linuxthreads/Changes deleted file mode 100644 index b213f36c5..000000000 --- a/libpthread/linuxthreads/Changes +++ /dev/null @@ -1,85 +0,0 @@ -Release 0.9: -- more ports (SH, IA-64, s390) -- many bug fixes -- timed sync object wait functions -- barrier implementation -- spinlocks implementation -- thread register on x86 -- variable stack size and position on some platforms - -Release 0.8: -(ehmm, forgot to update, don't know anymore) - -Release 0.7: -- Destructors for thread-specific data now conform to the POSIX semantics - (call destructors again if non-NULL TSD remains after a round of - destruction). -- Implemented thread-specific data as a sparse array, allows more TSD keys - and smaller thread descriptors (Ulrich Drepper). -- Added "error checking" mutexes. -- Protect against multiple sigwait() on the same signals. -- Simplified implementation of semaphores when compare_and_swap is - not available. -- Fixed bug in fork() where stdin was closed if fork() was called before - the first pthread_create(). -- Fixed bug in the gethostby*_r functions (bad result if null bytes - in addresses). -- Typos in manual pages corrected. -- First cut at a PowerPC port (not working yet, runs into problems - with gcc and with the C library). - -Release 0.6: -- Validation of thread identifiers: no more crashes when operating on - a thread that has exited (based on Pavel Krauz's ideas). -- Added fallback implementation of semaphores for the 386 and the - Sparc. -- Fixed a bug in signal handling causing false restarts of suspended - threads. -- Fixed a bug in realtime scheduling causing all threads to have - default scheduling on Ix86 with libc5. -- With realtime scheduling, unlocking a mutex now restarts the - highest priority thread waiting on the mutex, not the - first-suspended thread (Richard Neitzel). -- Timing a process now returns cumulative times for all threads, not - just times for the initial thread (suggested by Wolfram Gloger). -- Cleaned up name space (internal defs prefixed by __, weak aliases - for non-portable extensions). -- MIPS port (contributed by Ralf Baechle). - -Release 0.5: -- Signal-safe semaphores a la POSIX 1003.1b added. -- Locking bug in pthread_mutex_trylock over recursive mutexes fixed. -- Race conditions in thread cancellation fixed. -- Sparc port (contributed by Miguel de Icaza). -- Support for getpwnam_r and getpwuid_r. -- Added pthread_kill_other_threads_np to be used in conjunction with - exec*(). - -Release 0.4: -- Manual pages for all functions. -- Synchronization bug causing accumulation of zombie processes fixed. -- Race condition in pthread_cond_timedwait fixed. -- Recursive mutexes are back by popular demand. -- Partial support for realtime scheduling (initiated by Richard Neitzel). -- pthread.h cleaned up a lot: now C++ compatible, added missing "const" - qualifiers, added short documentation, put to GNU libc standards - for name space pollution (Ulrich Drepper). -- Motorola 68k port (contributed by Andreas Schwab). -- Interaction with fork(2) cleaned up a lot. - -Release 0.3: -- Thread creation and reclaimation now performed by a centralized - "thread manager" thread. -- Removed recursive mutexes to make regular mutexes more efficient. -- Now available as a shared library (contributed by Richard Henderson). -- Alpha port (contributed by Richard Henderson). -- Fixed many small discrepancies with Posix 1003.1c. -- Put under the LGPL instead of the GPL. - -Release 0.2: -- Reentrant libc functions (adapted from libc 5.3.9 by Peeter Joot) -- pthread_cond_wait did not reacquire the mutex correctly on return -- More efficient pthread_cond_broadcast - -Release 0.1: -- First public release diff --git a/libpthread/linuxthreads/FAQ.html b/libpthread/linuxthreads/FAQ.html deleted file mode 100644 index 21be33ec4..000000000 --- a/libpthread/linuxthreads/FAQ.html +++ /dev/null @@ -1,1039 +0,0 @@ -<HTML> -<HEAD> -<TITLE>LinuxThreads Frequently Asked Questions</TITLE> -</HEAD> -<BODY> -<H1 ALIGN=center>LinuxThreads Frequently Asked Questions <BR> - (with answers)</H1> -<H2 ALIGN=center>[For LinuxThreads version 0.8]</H2> - -<HR><P> - -<A HREF="#A">A. The big picture</A><BR> -<A HREF="#B">B. Getting more information</A><BR> -<A HREF="#C">C. Issues related to the C library</A><BR> -<A HREF="#D">D. Problems, weird behaviors, potential bugs</A><BR> -<A HREF="#E">E. Missing functions, wrong types, etc</A><BR> -<A HREF="#F">F. C++ issues</A><BR> -<A HREF="#G">G. Debugging LinuxThreads programs</A><BR> -<A HREF="#H">H. Compiling multithreaded code; errno madness</A><BR> -<A HREF="#I">I. X-Windows and other libraries</A><BR> -<A HREF="#J">J. Signals and threads</A><BR> -<A HREF="#K">K. Internals of LinuxThreads</A><P> - -<HR> -<P> - -<H2><A NAME="A">A. The big picture</A></H2> - -<H4><A NAME="A.1">A.1: What is LinuxThreads?</A></H4> - -LinuxThreads is a Linux library for multi-threaded programming. -It implements the Posix 1003.1c API (Application Programming -Interface) for threads. It runs on any Linux system with kernel 2.0.0 -or more recent, and a suitable C library (see section <A HREF="C">C</A>). -<P> - -<H4><A NAME="A.2">A.2: What are threads?</A></H4> - -A thread is a sequential flow of control through a program. -Multi-threaded programming is, thus, a form of parallel programming -where several threads of control are executing concurrently in the -program. All threads execute in the same memory space, and can -therefore work concurrently on shared data.<P> - -Multi-threaded programming differs from Unix-style multi-processing in -that all threads share the same memory space (and a few other system -resources, such as file descriptors), instead of running in their own -memory space as is the case with Unix processes.<P> - -Threads are useful for two reasons. First, they allow a program to -exploit multi-processor machines: the threads can run in parallel on -several processors, allowing a single program to divide its work -between several processors, thus running faster than a single-threaded -program, which runs on only one processor at a time. Second, some -programs are best expressed as several threads of control that -communicate together, rather than as one big monolithic sequential -program. Examples include server programs, overlapping asynchronous -I/O, and graphical user interfaces.<P> - -<H4><A NAME="A.3">A.3: What is POSIX 1003.1c?</A></H4> - -It's an API for multi-threaded programming standardized by IEEE as -part of the POSIX standards. Most Unix vendors have endorsed the -POSIX 1003.1c standard. Implementations of the 1003.1c API are -already available under Sun Solaris 2.5, Digital Unix 4.0, -Silicon Graphics IRIX 6, and should soon be available from other -vendors such as IBM and HP. More generally, the 1003.1c API is -replacing relatively quickly the proprietary threads library that were -developed previously under Unix, such as Mach cthreads, Solaris -threads, and IRIX sprocs. Thus, multithreaded programs using the -1003.1c API are likely to run unchanged on a wide variety of Unix -platforms.<P> - -<H4><A NAME="A.4">A.4: What is the status of LinuxThreads?</A></H4> - -LinuxThreads implements almost all of Posix 1003.1c, as well as a few -extensions. The only part of LinuxThreads that does not conform yet -to Posix is signal handling (see section <A HREF="#J">J</A>). Apart -from the signal stuff, all the Posix 1003.1c base functionality, -as well as a number of optional extensions, are provided and conform -to the standard (to the best of my knowledge). -The signal stuff is hard to get right, at least without special kernel -support, and while I'm definitely looking at ways to implement the -Posix behavior for signals, this might take a long time before it's -completed.<P> - -<H4><A NAME="A.5">A.5: How stable is LinuxThreads?</A></H4> - -The basic functionality (thread creation and termination, mutexes, -conditions, semaphores) is very stable. Several industrial-strength -programs, such as the AOL multithreaded Web server, use LinuxThreads -and seem quite happy about it. There used to be some rough edges in -the LinuxThreads / C library interface with libc 5, but glibc 2 -fixes all of those problems and is now the standard C library on major -Linux distributions (see section <A HREF="#C">C</A>). <P> - -<HR> -<P> - -<H2><A NAME="B">B. Getting more information</A></H2> - -<H4><A NAME="B.1">B.1: What are good books and other sources of -information on POSIX threads?</A></H4> - -The FAQ for comp.programming.threads lists several books: -<A HREF="http://www.serpentine.com/~bos/threads-faq/">http://www.serpentine.com/~bos/threads-faq/</A>.<P> - -There are also some online tutorials. Follow the links from the -LinuxThreads web page: -<A HREF="http://pauillac.inria.fr/~xleroy/linuxthreads">http://pauillac.inria.fr/~xleroy/linuxthreads</A>.<P> - -<H4><A NAME="B.2">B.2: I'd like to be informed of future developments on -LinuxThreads. Is there a mailing list for this purpose?</A></H4> - -I post LinuxThreads-related announcements on the newsgroup -<A HREF="news:comp.os.linux.announce">comp.os.linux.announce</A>, -and also on the mailing list -<code>linux-threads@magenet.com</code>. -You can subscribe to the latter by writing -<A HREF="mailto:majordomo@magenet.com">majordomo@magenet.com</A>.<P> - -<H4><A NAME="B.3">B.3: What are good places for discussing -LinuxThreads?</A></H4> - -For questions about programming with POSIX threads in general, use -the newsgroup -<A HREF="news:comp.programming.threads">comp.programming.threads</A>. -Be sure you read the -<A HREF="http://www.serpentine.com/~bos/threads-faq/">FAQ</A> -for this group before you post.<P> - -For Linux-specific questions, use -<A -HREF="news:comp.os.linux.development.apps">comp.os.linux.development.apps</A> -and <A -HREF="news:comp.os.linux.development.kernel">comp.os.linux.development.kernel</A>. -The latter is especially appropriate for questions relative to the -interface between the kernel and LinuxThreads.<P> - -<H4><A NAME="B.4">B.4: How should I report a possible bug in -LinuxThreads?</A></H4> - -If you're using glibc 2, the best way by far is to use the -<code>glibcbug</code> script to mail a bug report to the glibc -maintainers. <P> - -If you're using an older libc, or don't have the <code>glibcbug</code> -script on your machine, then e-mail me directly -(<code>Xavier.Leroy@inria.fr</code>). <P> - -In both cases, before sending the bug report, make sure that it is not -addressed already in this FAQ. Also, try to send a short program that -reproduces the weird behavior you observed. <P> - -<H4><A NAME="B.5">B.5: I'd like to read the POSIX 1003.1c standard. Is -it available online?</A></H4> - -Unfortunately, no. POSIX standards are copyrighted by IEEE, and -IEEE does not distribute them freely. You can buy paper copies from -IEEE, but the price is fairly high ($120 or so). If you disagree with -this policy and you're an IEEE member, be sure to let them know.<P> - -On the other hand, you probably don't want to read the standard. It's -very hard to read, written in standard-ese, and targeted to -implementors who already know threads inside-out. A good book on -POSIX threads provides the same information in a much more readable form. -I can personally recommend Dave Butenhof's book, <CITE>Programming -with POSIX threads</CITE> (Addison-Wesley). Butenhof was part of the -POSIX committee and also designed the Digital Unix implementations of -POSIX threads, and it shows.<P> - -Another good source of information is the X/Open Group Single Unix -specification which is available both -<A HREF="http://www.rdg.opengroup.org/onlinepubs/7908799/index.html">on-line</A> -and as a -<A HREF="http://www.UNIX-systems.org/gosolo2/">book and CD/ROM</A>. -That specification includes pretty much all the POSIX standards, -including 1003.1c, with some extensions and clarifications.<P> - -<HR> -<P> - -<H2><A NAME="C">C. Issues related to the C library</A></H2> - -<H4><A NAME="C.1">C.1: Which version of the C library should I use -with LinuxThreads?</A></H4> - -The best choice by far is glibc 2, a.k.a. libc 6. It offers very good -support for multi-threading, and LinuxThreads has been closely -integrated with glibc 2. The glibc 2 distribution contains the -sources of a specially adapted version of LinuxThreads.<P> - -glibc 2 comes preinstalled as the default C library on several Linux -distributions, such as RedHat 5 and up, and Debian 2. -Those distributions include the version of LinuxThreads matching -glibc 2.<P> - -<H4><A NAME="C.2">C.2: My system has libc 5 preinstalled, not glibc -2. Can I still use LinuxThreads?</H4> - -Yes, but you're likely to run into some problems, as libc 5 only -offers minimal support for threads and contains some bugs that affect -multithreaded programs. <P> - -The versions of libc 5 that work best with LinuxThreads are -libc 5.2.18 on the one hand, and libc 5.4.12 or later on the other hand. -Avoid 5.3.12 and 5.4.7: these have problems with the per-thread errno -variable. <P> - -<H4><A NAME="C.3">C.3: So, should I switch to glibc 2, or stay with a -recent libc 5?</A></H4> - -I'd recommend you switch to glibc 2. Even for single-threaded -programs, glibc 2 is more solid and more standard-conformant than libc -5. And the shortcomings of libc 5 almost preclude any serious -multi-threaded programming.<P> - -Switching an already installed -system from libc 5 to glibc 2 is not completely straightforward. -See the <A HREF="http://sunsite.unc.edu/LDP/HOWTO/Glibc2-HOWTO.html">Glibc2 -HOWTO</A> for more information. Much easier is (re-)installing a -Linux distribution based on glibc 2, such as RedHat 6.<P> - -<H4><A NAME="C.4">C.4: Where can I find glibc 2 and the version of -LinuxThreads that goes with it?</A></H4> - -On <code>prep.ai.mit.edu</code> and its many, many mirrors around the world. -See <A -HREF="http://www.gnu.org/order/ftp.html">http://www.gnu.org/order/ftp.html</A> -for a list of mirrors.<P> - -<H4><A NAME="C.5">C.5: Where can I find libc 5 and the version of -LinuxThreads that goes with it?</A></H4> - -For libc 5, see <A HREF="ftp://sunsite.unc.edu/pub/Linux/devel/GCC/"><code>ftp://sunsite.unc.edu/pub/Linux/devel/GCC/</code></A>.<P> - -For the libc 5 version of LinuxThreads, see -<A HREF="ftp://ftp.inria.fr/INRIA/Projects/cristal/Xavier.Leroy/linuxthreads/">ftp://ftp.inria.fr/INRIA/Projects/cristal/Xavier.Leroy/linuxthreads/</A>.<P> - -<H4><A NAME="C.6">C.6: How can I recompile the glibc 2 version of the -LinuxThreads sources?</A></H4> - -You must transfer the whole glibc sources, then drop the LinuxThreads -sources in the <code>linuxthreads/</code> subdirectory, then recompile -glibc as a whole. There are now too many inter-dependencies between -LinuxThreads and glibc 2 to allow separate re-compilation of LinuxThreads. -<P> - -<H4><A NAME="C.7">C.7: What is the correspondence between LinuxThreads -version numbers, libc version numbers, and RedHat version -numbers?</A></H4> - -Here is a summary. (Information on Linux distributions other than -RedHat are welcome.)<P> - -<TABLE> -<TR><TD>LinuxThreads </TD> <TD>C library</TD> <TD>RedHat</TD></TR> -<TR><TD>0.7, 0.71 (for libc 5)</TD> <TD>libc 5.x</TD> <TD>RH 4.2</TD></TR> -<TR><TD>0.7, 0.71 (for glibc 2)</TD> <TD>glibc 2.0.x</TD> <TD>RH 5.x</TD></TR> -<TR><TD>0.8</TD> <TD>glibc 2.1.1</TD> <TD>RH 6.0</TD></TR> -<TR><TD>0.8</TD> <TD>glibc 2.1.2</TD> <TD>not yet released</TD></TR> -</TABLE> -<P> - -<HR> -<P> - -<H2><A NAME="D">D. Problems, weird behaviors, potential bugs</A></H2> - -<H4><A NAME="D.1">D.1: When I compile LinuxThreads, I run into problems in -file <code>libc_r/dirent.c</code></A></H4> - -You probably mean: -<PRE> - libc_r/dirent.c:94: structure has no member named `dd_lock' -</PRE> -I haven't actually seen this problem, but several users reported it. -My understanding is that something is wrong in the include files of -your Linux installation (<code>/usr/include/*</code>). Make sure -you're using a supported version of the libc 5 library. (See question <A -HREF="#C.2">C.2</A>).<P> - -<H4><A NAME="D.2">D.2: When I compile LinuxThreads, I run into problems with -<CODE>/usr/include/sched.h</CODE>: there are several occurrences of -<CODE>_p</CODE> that the C compiler does not understand</A></H4> - -Yes, <CODE>/usr/include/sched.h</CODE> that comes with libc 5.3.12 is broken. -Replace it with the <code>sched.h</code> file contained in the -LinuxThreads distribution. But really you should not be using libc -5.3.12 with LinuxThreads! (See question <A HREF="#C.2">C.1</A>.)<P> - -<H4><A NAME="D.3">D.3: My program does <CODE>fdopen()</CODE> on a file -descriptor opened on a pipe. When I link it with LinuxThreads, -<CODE>fdopen()</CODE> always returns NULL!</A></H4> - -You're using one of the buggy versions of libc (5.3.12, 5.4.7., etc). -See question <A HREF="#C.1">C.1</A> above.<P> - -<H4><A NAME="D.4">D.4: My program creates a lot of threads, and after -a while <CODE>pthread_create()</CODE> no longer returns!</A></H4> - -This is known bug in the version of LinuxThreads that comes with glibc -2.1.1. An upgrade to 2.1.2 is recommended. <P> - -<H4><A NAME="D.5">D.5: When I'm running a program that creates N -threads, <code>top</code> or <code>ps</code> -display N+2 processes that are running my program. What do all these -processes correspond to?</A></H4> - -Due to the general "one process per thread" model, there's one process -for the initial thread and N processes for the threads it created -using <CODE>pthread_create</CODE>. That leaves one process -unaccounted for. That extra process corresponds to the "thread -manager" thread, a thread created internally by LinuxThreads to handle -thread creation and thread termination. This extra thread is asleep -most of the time. - -<H4><A NAME="D.6">D.6: Scheduling seems to be very unfair when there -is strong contention on a mutex: instead of giving the mutex to each -thread in turn, it seems that it's almost always the same thread that -gets the mutex. Isn't this completely broken behavior?</A></H4> - -That behavior has mostly disappeared in recent releases of -LinuxThreads (version 0.8 and up). It was fairly common in older -releases, though. - -What happens in LinuxThreads 0.7 and before is the following: when a -thread unlocks a mutex, all other threads that were waiting on the -mutex are sent a signal which makes them runnable. However, the -kernel scheduler may or may not restart them immediately. If the -thread that unlocked the mutex tries to lock it again immediately -afterwards, it is likely that it will succeed, because the threads -haven't yet restarted. This results in an apparently very unfair -behavior, when the same thread repeatedly locks and unlocks the mutex, -while other threads can't lock the mutex.<P> - -In LinuxThreads 0.8 and up, <code>pthread_unlock</code> restarts only -one waiting thread, and pre-assign the mutex to that thread. Hence, -if the thread that unlocked the mutex tries to lock it again -immediately, it will block until other waiting threads have had a -chance to lock and unlock the mutex. This results in much fairer -scheduling.<P> - -Notice however that even the old "unfair" behavior is perfectly -acceptable with respect to the POSIX standard: for the default -scheduling policy, POSIX makes no guarantees of fairness, such as "the -thread waiting for the mutex for the longest time always acquires it -first". Properly written multithreaded code avoids that kind of heavy -contention on mutexes, and does not run into fairness problems. If -you need scheduling guarantees, you should consider using the -real-time scheduling policies <code>SCHED_RR</code> and -<code>SCHED_FIFO</code>, which have precisely defined scheduling -behaviors. <P> - -<H4><A NAME="D.7">D.7: I have a simple test program with two threads -that do nothing but <CODE>printf()</CODE> in tight loops, and from the -printout it seems that only one thread is running, the other doesn't -print anything!</A></H4> - -Again, this behavior is characteristic of old releases of LinuxThreads -(0.7 and before); more recent versions (0.8 and up) should not exhibit -this behavior.<P> - -The reason for this behavior is explained in -question <A HREF="#D.6">D.6</A> above: <CODE>printf()</CODE> performs -locking on <CODE>stdout</CODE>, and thus your two threads contend very -heavily for the mutex associated with <CODE>stdout</CODE>. But if you -do some real work between two calls to <CODE>printf()</CODE>, you'll -see that scheduling becomes much smoother.<P> - -<H4><A NAME="D.8">D.8: I've looked at <code><pthread.h></code> -and there seems to be a gross error in the <code>pthread_cleanup_push</code> -macro: it opens a block with <code>{</code> but does not close it! -Surely you forgot a <code>}</code> at the end of the macro, right? -</A></H4> - -Nope. That's the way it should be. The closing brace is provided by -the <code>pthread_cleanup_pop</code> macro. The POSIX standard -requires <code>pthread_cleanup_push</code> and -<code>pthread_cleanup_pop</code> to be used in matching pairs, at the -same level of brace nesting. This allows -<code>pthread_cleanup_push</code> to open a block in order to -stack-allocate some data structure, and -<code>pthread_cleanup_pop</code> to close that block. It's ugly, but -it's the standard way of implementing cleanup handlers.<P> - -<H4><A NAME="D.9">D.9: I tried to use real-time threads and my program -loops like crazy and freezes the whole machine!</A></H4> - -Versions of LinuxThreads prior to 0.8 are susceptible to ``livelocks'' -(one thread loops, consuming 100% of the CPU time) in conjunction with -real-time scheduling. Since real-time threads and processes have -higher priority than normal Linux processes, all other processes on -the machine, including the shell, the X server, etc, cannot run and -the machine appears frozen.<P> - -The problem is fixed in LinuxThreads 0.8.<P> - -<H4><A NAME="D.10">D.10: My application needs to create thousands of -threads, or maybe even more. Can I do this with -LinuxThreads?</A></H4> - -No. You're going to run into several hard limits: -<UL> -<LI>Each thread, from the kernel's standpoint, is one process. Stock -Linux kernels are limited to at most 512 processes for the super-user, -and half this number for regular users. This can be changed by -changing <code>NR_TASKS</code> in <code>include/linux/tasks.h</code> -and recompiling the kernel. On the x86 processors at least, -architectural constraints seem to limit <code>NR_TASKS</code> to 4090 -at most. -<LI>LinuxThreads contains a table of all active threads. This table -has room for 1024 threads at most. To increase this limit, you must -change <code>PTHREAD_THREADS_MAX</code> in the LinuxThreads sources -and recompile. -<LI>By default, each thread reserves 2M of virtual memory space for -its stack. This space is just reserved; actual memory is allocated -for the stack on demand. But still, on a 32-bit processor, the total -virtual memory space available for the stacks is on the order of 1G, -meaning that more than 500 threads will have a hard time fitting in. -You can overcome this limitation by moving to a 64-bit platform, or by -allocating smaller stacks yourself using the <code>setstackaddr</code> -attribute. -<LI>Finally, the Linux kernel contains many algorithms that run in -time proportional to the number of process table entries. Increasing -this number drastically will slow down the kernel operations -noticeably. -</UL> -(Other POSIX threads libraries have similar limitations, by the way.) -For all those reasons, you'd better restructure your application so -that it doesn't need more than, say, 100 threads. For instance, -in the case of a multithreaded server, instead of creating a new -thread for each connection, maintain a fixed-size pool of worker -threads that pick incoming connection requests from a queue.<P> - -<HR> -<P> - -<H2><A NAME="E">E. Missing functions, wrong types, etc</A></H2> - -<H4><A NAME="E.1">E.1: Where is <CODE>pthread_yield()</CODE> ? How -comes LinuxThreads does not implement it?</A></H4> - -Because it's not part of the (final) POSIX 1003.1c standard. -Several drafts of the standard contained <CODE>pthread_yield()</CODE>, -but then the POSIX guys discovered it was redundant with -<CODE>sched_yield()</CODE> and dropped it. So, just use -<CODE>sched_yield()</CODE> instead. - -<H4><A NAME="E.2">E.2: I've found some type errors in -<code><pthread.h></code>. -For instance, the second argument to <CODE>pthread_create()</CODE> -should be a <CODE>pthread_attr_t</CODE>, not a -<CODE>pthread_attr_t *</CODE>. Also, didn't you forget to declare -<CODE>pthread_attr_default</CODE>?</A></H4> - -No, I didn't. What you're describing is draft 4 of the POSIX -standard, which is used in OSF DCE threads. LinuxThreads conforms to the -final standard. Even though the functions have the same names as in -draft 4 and DCE, their calling conventions are slightly different. In -particular, attributes are passed by reference, not by value, and -default attributes are denoted by the NULL pointer. Since draft 4/DCE -will eventually disappear, you'd better port your program to use the -standard interface.<P> - -<H4><A NAME="E.3">E.3: I'm porting an application from Solaris and I -have to rename all thread functions from <code>thr_blah</code> to -<CODE>pthread_blah</CODE>. This is very annoying. Why did you change -all the function names?</A></H4> - -POSIX did it. The <code>thr_*</code> functions correspond to Solaris -threads, an older thread interface that you'll find only under -Solaris. The <CODE>pthread_*</CODE> functions correspond to POSIX -threads, an international standard available for many, many platforms. -Even Solaris 2.5 and later support the POSIX threads interface. So, -do yourself a favor and rewrite your code to use POSIX threads: this -way, it will run unchanged under Linux, Solaris, and quite a lot of -other platforms.<P> - -<H4><A NAME="E.4">E.4: How can I suspend and resume a thread from -another thread? Solaris has the <CODE>thr_suspend()</CODE> and -<CODE>thr_resume()</CODE> functions to do that; why don't you?</A></H4> - -The POSIX standard provides <B>no</B> mechanism by which a thread A can -suspend the execution of another thread B, without cooperation from B. -The only way to implement a suspend/restart mechanism is to have B -check periodically some global variable for a suspend request -and then suspend itself on a condition variable, which another thread -can signal later to restart B.<P> - -Notice that <CODE>thr_suspend()</CODE> is inherently dangerous and -prone to race conditions. For one thing, there is no control on where -the target thread stops: it can very well be stopped in the middle of -a critical section, while holding mutexes. Also, there is no -guarantee on when the target thread will actually stop. For these -reasons, you'd be much better off using mutexes and conditions -instead. The only situations that really require the ability to -suspend a thread are debuggers and some kind of garbage collectors.<P> - -If you really must suspend a thread in LinuxThreads, you can send it a -<CODE>SIGSTOP</CODE> signal with <CODE>pthread_kill</CODE>. Send -<CODE>SIGCONT</CODE> for restarting it. -Beware, this is specific to LinuxThreads and entirely non-portable. -Indeed, a truly conforming POSIX threads implementation will stop all -threads when one thread receives the <CODE>SIGSTOP</CODE> signal! -One day, LinuxThreads will implement that behavior, and the -non-portable hack with <CODE>SIGSTOP</CODE> won't work anymore.<P> - -<H4><A NAME="E.5">E.5: Does LinuxThreads implement -<CODE>pthread_attr_setstacksize()</CODE> and -<CODE>pthread_attr_setstackaddr()</CODE>?</A></H4> - -These optional functions are provided in recent versions of -LinuxThreads (0.8 and up). Earlier releases did not provide these -optional components of the POSIX standard.<P> - -Even if <CODE>pthread_attr_setstacksize()</CODE> and -<CODE>pthread_attr_setstackaddr()</CODE> are now provided, we still -recommend that you do not use them unless you really have strong -reasons for doing so. The default stack allocation strategy for -LinuxThreads is nearly optimal: stacks start small (4k) and -automatically grow on demand to a fairly large limit (2M). -Moreover, there is no portable way to estimate the stack requirements -of a thread, so setting the stack size yourself makes your program -less reliable and non-portable.<P> - -<H4><A NAME="E.6">E.6: LinuxThreads does not support the -<CODE>PTHREAD_SCOPE_PROCESS</CODE> value of the "contentionscope" -attribute. Why? </A></H4> - -With a "one-to-one" model, as in LinuxThreads (one kernel execution -context per thread), there is only one scheduler for all processes and -all threads on the system. So, there is no way to obtain the behavior of -<CODE>PTHREAD_SCOPE_PROCESS</CODE>. - -<H4><A NAME="E.7">E.7: LinuxThreads does not implement process-shared -mutexes, conditions, and semaphores. Why?</A></H4> - -This is another optional component of the POSIX standard. Portable -applications should test <CODE>_POSIX_THREAD_PROCESS_SHARED</CODE> -before using this facility. -<P> -The goal of this extension is to allow different processes (with -different address spaces) to synchronize through mutexes, conditions -or semaphores allocated in shared memory (either SVR4 shared memory -segments or <CODE>mmap()</CODE>ed files). -<P> -The reason why this does not work in LinuxThreads is that mutexes, -conditions, and semaphores are not self-contained: their waiting -queues contain pointers to linked lists of thread descriptors, and -these pointers are meaningful only in one address space. -<P> -Matt Messier and I spent a significant amount of time trying to design a -suitable mechanism for sharing waiting queues between processes. We -came up with several solutions that combined two of the following -three desirable features, but none that combines all three: -<UL> -<LI>allow sharing between processes having different UIDs -<LI>supports cancellation -<LI>supports <CODE>pthread_cond_timedwait</CODE> -</UL> -We concluded that kernel support is required to share mutexes, -conditions and semaphores between processes. That's one place where -Linus Torvalds's intuition that "all we need in the kernel is -<CODE>clone()</CODE>" fails. -<P> -Until suitable kernel support is available, you'd better use -traditional interprocess communications to synchronize different -processes: System V semaphores and message queues, or pipes, or sockets. -<P> - -<HR> -<P> - -<H2><A NAME="F">F. C++ issues</A></H2> - -<H4><A NAME="F.1">F.1: Are there C++ wrappers for LinuxThreads?</A></H4> - -Douglas Schmidt's ACE library contains, among a lot of other -things, C++ wrappers for LinuxThreads and quite a number of other -thread libraries. Check out -<A HREF="http://www.cs.wustl.edu/~schmidt/ACE.html">http://www.cs.wustl.edu/~schmidt/ACE.html</A><P> - -<H4><A NAME="F.2">F.2: I'm trying to use LinuxThreads from a C++ -program, and the compiler complains about the third argument to -<CODE>pthread_create()</CODE> !</A></H4> - -You're probably trying to pass a class member function or some -other C++ thing as third argument to <CODE>pthread_create()</CODE>. -Recall that <CODE>pthread_create()</CODE> is a C function, and it must -be passed a C function as third argument.<P> - -<H4><A NAME="F.3">F.3: I'm trying to use LinuxThreads in conjunction -with libg++, and I'm having all sorts of trouble.</A></H4> - ->From what I understand, thread support in libg++ is completely broken, -especially with respect to locking of iostreams. H.J.Lu wrote: -<BLOCKQUOTE> -If you want to use thread, I can only suggest egcs and glibc. You -can find egcs at -<A HREF="http://www.cygnus.com/egcs">http://www.cygnus.com/egcs</A>. -egcs has libsdtc++, which is MT safe under glibc 2. If you really -want to use the libg++, I have a libg++ add-on for egcs. -</BLOCKQUOTE> -<HR> -<P> - -<H2><A NAME="G">G. Debugging LinuxThreads programs</A></H2> - -<H4><A NAME="G.1">G.1: Can I debug LinuxThreads program using gdb?</A></H4> - -Yes, but not with the stock gdb 4.17. You need a specially patched -version of gdb 4.17 developed by Eric Paire and colleages at The Open -Group, Grenoble. The patches against gdb 4.17 are available at -<A HREF="http://www.gr.opengroup.org/java/jdk/linux/debug.htm"><code>http://www.gr.opengroup.org/java/jdk/linux/debug.htm</code></A>. -Precompiled binaries of the patched gdb are available in RedHat's RPM -format at <A -HREF="http://odin.appliedtheory.com/"><code>http://odin.appliedtheory.com/</code></A>.<P> - -Some Linux distributions provide an already-patched version of gdb; -others don't. For instance, the gdb in RedHat 5.2 is thread-aware, -but apparently not the one in RedHat 6.0. Just ask (politely) the -makers of your Linux distributions to please make sure that they apply -the correct patches to gdb.<P> - -<H4><A NAME="G.2">G.2: Does it work with post-mortem debugging?</A></H4> - -Not very well. Generally, the core file does not correspond to the -thread that crashed. The reason is that the kernel will not dump core -for a process that shares its memory with other processes, such as the -other threads of your program. So, the thread that crashes silently -disappears without generating a core file. Then, all other threads of -your program die on the same signal that killed the crashing thread. -(This is required behavior according to the POSIX standard.) The last -one that dies is no longer sharing its memory with anyone else, so the -kernel generates a core file for that thread. Unfortunately, that's -not the thread you are interested in. - -<H4><A NAME="G.3">G.3: Any other ways to debug multithreaded programs, then?</A></H4> - -Assertions and <CODE>printf()</CODE> are your best friends. Try to debug -sequential parts in a single-threaded program first. Then, put -<CODE>printf()</CODE> statements all over the place to get execution traces. -Also, check invariants often with the <CODE>assert()</CODE> macro. In truth, -there is no other effective way (save for a full formal proof of your -program) to track down concurrency bugs. Debuggers are not really -effective for subtle concurrency problems, because they disrupt -program execution too much.<P> - -<HR> -<P> - -<H2><A NAME="H">H. Compiling multithreaded code; errno madness</A></H2> - -<H4><A NAME="H.1">H.1: You say all multithreaded code must be compiled -with <CODE>_REENTRANT</CODE> defined. What difference does it make?</A></H4> - -It affects include files in three ways: -<UL> -<LI> The include files define prototypes for the reentrant variants of -some of the standard library functions, -e.g. <CODE>gethostbyname_r()</CODE> as a reentrant equivalent to -<CODE>gethostbyname()</CODE>.<P> - -<LI> If <CODE>_REENTRANT</CODE> is defined, some -<code><stdio.h></code> functions are no longer defined as macros, -e.g. <CODE>getc()</CODE> and <CODE>putc()</CODE>. In a multithreaded -program, stdio functions require additional locking, which the macros -don't perform, so we must call functions instead.<P> - -<LI> More importantly, <code><errno.h></code> redefines errno when -<CODE>_REENTRANT</CODE> is -defined, so that errno refers to the thread-specific errno location -rather than the global errno variable. This is achieved by the -following <code>#define</code> in <code><errno.h></code>: -<PRE> - #define errno (*(__errno_location())) -</PRE> -which causes each reference to errno to call the -<CODE>__errno_location()</CODE> function for obtaining the location -where error codes are stored. libc provides a default definition of -<CODE>__errno_location()</CODE> that always returns -<code>&errno</code> (the address of the global errno variable). Thus, -for programs not linked with LinuxThreads, defining -<CODE>_REENTRANT</CODE> makes no difference w.r.t. errno processing. -But LinuxThreads redefines <CODE>__errno_location()</CODE> to return a -location in the thread descriptor reserved for holding the current -value of errno for the calling thread. Thus, each thread operates on -a different errno location. -</UL> -<P> - -<H4><A NAME="H.2">H.2: Why is it so important that each thread has its -own errno variable? </A></H4> - -If all threads were to store error codes in the same, global errno -variable, then the value of errno after a system call or library -function returns would be unpredictable: between the time a system -call stores its error code in the global errno and your code inspects -errno to see which error occurred, another thread might have stored -another error code in the same errno location. <P> - -<H4><A NAME="H.3">H.3: What happens if I link LinuxThreads with code -not compiled with <CODE>-D_REENTRANT</CODE>?</A></H4> - -Lots of trouble. If the code uses <CODE>getc()</CODE> or -<CODE>putc()</CODE>, it will perform I/O without proper interlocking -of the stdio buffers; this can cause lost output, duplicate output, or -just crash other stdio functions. If the code consults errno, it will -get back the wrong error code. The following code fragment is a -typical example: -<PRE> - do { - r = read(fd, buf, n); - if (r == -1) { - if (errno == EINTR) /* an error we can handle */ - continue; - else { /* other errors are fatal */ - perror("read failed"); - exit(100); - } - } - } while (...); -</PRE> -Assume this code is not compiled with <CODE>-D_REENTRANT</CODE>, and -linked with LinuxThreads. At run-time, <CODE>read()</CODE> is -interrupted. Since the C library was compiled with -<CODE>-D_REENTRANT</CODE>, <CODE>read()</CODE> stores its error code -in the location pointed to by <CODE>__errno_location()</CODE>, which -is the thread-local errno variable. Then, the code above sees that -<CODE>read()</CODE> returns -1 and looks up errno. Since -<CODE>_REENTRANT</CODE> is not defined, the reference to errno -accesses the global errno variable, which is most likely 0. Hence the -code concludes that it cannot handle the error and stops.<P> - -<H4><A NAME="H.4">H.4: With LinuxThreads, I can no longer use the signals -<code>SIGUSR1</code> and <code>SIGUSR2</code> in my programs! Why? </A></H4> - -The short answer is: because the Linux kernel you're using does not -support realtime signals. <P> - -LinuxThreads needs two signals for its internal operation. -One is used to suspend and restart threads blocked on mutex, condition -or semaphore operations. The other is used for thread -cancellation.<P> - -On ``old'' kernels (2.0 and early 2.1 kernels), there are only 32 -signals available and the kernel reserves all of them but two: -<code>SIGUSR1</code> and <code>SIGUSR2</code>. So, LinuxThreads has -no choice but use those two signals.<P> - -On recent kernels (2.2 and up), more than 32 signals are provided in -the form of realtime signals. When run on one of those kernels, -LinuxThreads uses two reserved realtime signals for its internal -operation, thus leaving <code>SIGUSR1</code> and <code>SIGUSR2</code> -free for user code. (This works only with glibc, not with libc 5.) <P> - -<H4><A NAME="H.5">H.5: Is the stack of one thread visible from the -other threads? Can I pass a pointer into my stack to other threads? -</A></H4> - -Yes, you can -- if you're very careful. The stacks are indeed visible -from all threads in the system. Some non-POSIX thread libraries seem -to map the stacks for all threads at the same virtual addresses and -change the memory mapping when they switch from one thread to -another. But this is not the case for LinuxThreads, as it would make -context switching between threads more expensive, and at any rate -might not conform to the POSIX standard.<P> - -So, you can take the address of an "auto" variable and pass it to -other threads via shared data structures. However, you need to make -absolutely sure that the function doing this will not return as long -as other threads need to access this address. It's the usual mistake -of returning the address of an "auto" variable, only made much worse -because of concurrency. It's much, much safer to systematically -heap-allocate all shared data structures. <P> - -<HR> -<P> - -<H2><A NAME="I">I. X-Windows and other libraries</A></H2> - -<H4><A NAME="I.1">I.1: My program uses both Xlib and LinuxThreads. -It stops very early with an "Xlib: unknown 0 error" message. What -does this mean? </A></H4> - -That's a prime example of the errno problem described in question <A -HREF="#H.2">H.2</A>. The binaries for Xlib you're using have not been -compiled with <CODE>-D_REENTRANT</CODE>. It happens Xlib contains a -piece of code very much like the one in question <A -HREF="#H.2">H.2</A>. So, your Xlib fetches the error code from the -wrong errno location and concludes that an error it cannot handle -occurred.<P> - -<H4><A NAME="I.2">I.2: So, what can I do to build a multithreaded X -Windows client? </A></H4> - -The best solution is to use X libraries that have been compiled with -multithreading options set. Linux distributions that come with glibc -2 as the main C library generally provide thread-safe X libraries. -At least, that seems to be the case for RedHat 5 and later.<P> - -You can try to recompile yourself the X libraries with multithreading -options set. They contain optional support for multithreading; it's -just that the binaries provided by your Linux distribution were built -without this support. See the file <code>README.Xfree3.3</code> in -the LinuxThreads distribution for patches and info on how to compile -thread-safe X libraries from the Xfree3.3 distribution. The Xfree3.3 -sources are readily available in most Linux distributions, e.g. as a -source RPM for RedHat. Be warned, however, that X Windows is a huge -system, and recompiling even just the libraries takes a lot of time -and disk space.<P> - -Another, less involving solution is to call X functions only from the -main thread of your program. Even if all threads have their own errno -location, the main thread uses the global errno variable for its errno -location. Thus, code not compiled with <code>-D_REENTRANT</code> -still "sees" the right error values if it executes in the main thread -only. <P> - -<H4><A NAME="I.2">This is a lot of work. Don't you have precompiled -thread-safe X libraries that you could distribute?</A></H4> - -No, I don't. Sorry. But consider installing a Linux distribution -that comes with thread-safe X libraries, such as RedHat 6.<P> - -<H4><A NAME="I.3">I.3: Can I use library FOO in a multithreaded -program?</A></H4> - -Most libraries cannot be used "as is" in a multithreaded program. -For one thing, they are not necessarily thread-safe: calling -simultaneously two functions of the library from two threads might not -work, due to internal use of global variables and the like. Second, -the libraries must have been compiled with <CODE>-D_REENTRANT</CODE> to avoid -the errno problems explained in question <A HREF="#H.2">H.2</A>. -<P> - -<H4><A NAME="I.4">I.4: What if I make sure that only one thread calls -functions in these libraries?</A></H4> - -This avoids problems with the library not being thread-safe. But -you're still vulnerable to errno problems. At the very least, a -recompile of the library with <CODE>-D_REENTRANT</CODE> is needed. -<P> - -<H4><A NAME="I.5">I.5: What if I make sure that only the main thread -calls functions in these libraries?</A></H4> - -That might actually work. As explained in question <A HREF="#I.1">I.1</A>, -the main thread uses the global errno variable, and can therefore -execute code not compiled with <CODE>-D_REENTRANT</CODE>.<P> - -<H4><A NAME="I.6">I.6: SVGAlib doesn't work with LinuxThreads. Why? -</A></H4> - -Because both LinuxThreads and SVGAlib use the signals -<code>SIGUSR1</code> and <code>SIGUSR2</code>. See question <A -HREF="#H.4">H.4</A>. -<P> - - -<HR> -<P> - -<H2><A NAME="J">J. Signals and threads</A></H2> - -<H4><A NAME="J.1">J.1: When it comes to signals, what is shared -between threads and what isn't?</A></H4> - -Signal handlers are shared between all threads: when a thread calls -<CODE>sigaction()</CODE>, it sets how the signal is handled not only -for itself, but for all other threads in the program as well.<P> - -On the other hand, signal masks are per-thread: each thread chooses -which signals it blocks independently of others. At thread creation -time, the newly created thread inherits the signal mask of the thread -calling <CODE>pthread_create()</CODE>. But afterwards, the new thread -can modify its signal mask independently of its creator thread.<P> - -<H4><A NAME="J.2">J.2: When I send a <CODE>SIGKILL</CODE> to a -particular thread using <CODE>pthread_kill</CODE>, all my threads are -killed!</A></H4> - -That's how it should be. The POSIX standard mandates that all threads -should terminate when the process (i.e. the collection of all threads -running the program) receives a signal whose effect is to -terminate the process (such as <CODE>SIGKILL</CODE> or <CODE>SIGINT</CODE> -when no handler is installed on that signal). This behavior makes a -lot of sense: when you type "ctrl-C" at the keyboard, or when a thread -crashes on a division by zero or a segmentation fault, you really want -all threads to stop immediately, not just the one that caused the -segmentation violation or that got the <CODE>SIGINT</CODE> signal. -(This assumes default behavior for those signals; see question -<A HREF="#J.3">J.3</A> if you install handlers for those signals.)<P> - -If you're trying to terminate a thread without bringing the whole -process down, use <code>pthread_cancel()</code>.<P> - -<H4><A NAME="J.3">J.3: I've installed a handler on a signal. Which -thread executes the handler when the signal is received?</A></H4> - -If the signal is generated by a thread during its execution (e.g. a -thread executes a division by zero and thus generates a -<CODE>SIGFPE</CODE> signal), then the handler is executed by that -thread. This also applies to signals generated by -<CODE>raise()</CODE>.<P> - -If the signal is sent to a particular thread using -<CODE>pthread_kill()</CODE>, then that thread executes the handler.<P> - -If the signal is sent via <CODE>kill()</CODE> or the tty interface -(e.g. by pressing ctrl-C), then the POSIX specs say that the handler -is executed by any thread in the process that does not currently block -the signal. In other terms, POSIX considers that the signal is sent -to the process (the collection of all threads) as a whole, and any -thread that is not blocking this signal can then handle it.<P> - -The latter case is where LinuxThreads departs from the POSIX specs. -In LinuxThreads, there is no real notion of ``the process as a whole'': -in the kernel, each thread is really a distinct process with a -distinct PID, and signals sent to the PID of a thread can only be -handled by that thread. As long as no thread is blocking the signal, -the behavior conforms to the standard: one (unspecified) thread of the -program handles the signal. But if the thread to which PID the signal -is sent blocks the signal, and some other thread does not block the -signal, then LinuxThreads will simply queue in -that thread and execute the handler only when that thread unblocks -the signal, instead of executing the handler immediately in the other -thread that does not block the signal.<P> - -This is to be viewed as a LinuxThreads bug, but I currently don't see -any way to implement the POSIX behavior without kernel support.<P> - -<H4><A NAME="J.3">J.3: How shall I go about mixing signals and threads -in my program? </A></H4> - -The less you mix them, the better. Notice that all -<CODE>pthread_*</CODE> functions are not async-signal safe, meaning -that you should not call them from signal handlers. This -recommendation is not to be taken lightly: your program can deadlock -if you call a <CODE>pthread_*</CODE> function from a signal handler! -<P> - -The only sensible things you can do from a signal handler is set a -global flag, or call <CODE>sem_post</CODE> on a semaphore, to record -the delivery of the signal. The remainder of the program can then -either poll the global flag, or use <CODE>sem_wait()</CODE> and -<CODE>sem_trywait()</CODE> on the semaphore.<P> - -Another option is to do nothing in the signal handler, and dedicate -one thread (preferably the initial thread) to wait synchronously for -signals, using <CODE>sigwait()</CODE>, and send messages to the other -threads accordingly. - -<H4><A NAME="J.4">J.4: When one thread is blocked in -<CODE>sigwait()</CODE>, other threads no longer receive the signals -<CODE>sigwait()</CODE> is waiting for! What happens? </A></H4> - -It's an unfortunate consequence of how LinuxThreads implements -<CODE>sigwait()</CODE>. Basically, it installs signal handlers on all -signals waited for, in order to record which signal was received. -Since signal handlers are shared with the other threads, this -temporarily deactivates any signal handlers you might have previously -installed on these signals.<P> - -Though surprising, this behavior actually seems to conform to the -POSIX standard. According to POSIX, <CODE>sigwait()</CODE> is -guaranteed to work as expected only if all other threads in the -program block the signals waited for (otherwise, the signals could be -delivered to other threads than the one doing <CODE>sigwait()</CODE>, -which would make <CODE>sigwait()</CODE> useless). In this particular -case, the problem described in this question does not appear.<P> - -One day, <CODE>sigwait()</CODE> will be implemented in the kernel, -along with others POSIX 1003.1b extensions, and <CODE>sigwait()</CODE> -will have a more natural behavior (as well as better performances).<P> - -<HR> -<P> - -<H2><A NAME="K">K. Internals of LinuxThreads</A></H2> - -<H4><A NAME="K.1">K.1: What is the implementation model for -LinuxThreads?</A></H4> - -LinuxThreads follows the so-called "one-to-one" model: each thread is -actually a separate process in the kernel. The kernel scheduler takes -care of scheduling the threads, just like it schedules regular -processes. The threads are created with the Linux -<code>clone()</code> system call, which is a generalization of -<code>fork()</code> allowing the new process to share the memory -space, file descriptors, and signal handlers of the parent.<P> - -Advantages of the "one-to-one" model include: -<UL> -<LI> minimal overhead on CPU-intensive multiprocessing (with -about one thread per processor); -<LI> minimal overhead on I/O operations; -<LI> a simple and robust implementation (the kernel scheduler does -most of the hard work for us). -</UL> -The main disadvantage is more expensive context switches on mutex and -condition operations, which must go through the kernel. This is -mitigated by the fact that context switches in the Linux kernel are -pretty efficient.<P> - -<H4><A NAME="K.2">K.2: Have you considered other implementation -models?</A></H4> - -There are basically two other models. The "many-to-one" model -relies on a user-level scheduler that context-switches between the -threads entirely in user code; viewed from the kernel, there is only -one process running. This model is completely out of the question for -me, since it does not take advantage of multiprocessors, and require -unholy magic to handle blocking I/O operations properly. There are -several user-level thread libraries available for Linux, but I found -all of them deficient in functionality, performance, and/or robustness. -<P> - -The "many-to-many" model combines both kernel-level and user-level -scheduling: several kernel-level threads run concurrently, each -executing a user-level scheduler that selects between user threads. -Most commercial Unix systems (Solaris, Digital Unix, IRIX) implement -POSIX threads this way. This model combines the advantages of both -the "many-to-one" and the "one-to-one" model, and is attractive -because it avoids the worst-case behaviors of both models -- -especially on kernels where context switches are expensive, such as -Digital Unix. Unfortunately, it is pretty complex to implement, and -requires kernel support which Linux does not provide. Linus Torvalds -and other Linux kernel developers have always been pushing the -"one-to-one" model in the name of overall simplicity, and are doing a -pretty good job of making kernel-level context switches between -threads efficient. LinuxThreads is just following the general -direction they set.<P> - -<HR> -<ADDRESS>Xavier.Leroy@inria.fr</ADDRESS> -</BODY> -</HTML> diff --git a/libpthread/linuxthreads/LICENSE b/libpthread/linuxthreads/LICENSE deleted file mode 100644 index 7bcca6050..000000000 --- a/libpthread/linuxthreads/LICENSE +++ /dev/null @@ -1,501 +0,0 @@ -GNU LIBRARY GENERAL PUBLIC LICENSE -********************************** - - Version 2, June 1991 - - Copyright (C) 1991 Free Software Foundation, Inc. - 59 Temple Place -- Suite 330, Boston, MA 02111-1307, USA - - Everyone is permitted to copy and distribute verbatim copies - of this license document, but changing it is not allowed. - - [This is the first released version of the library GPL. It is - numbered 2 because it goes with version 2 of the ordinary GPL.] - -Preamble -======== - - The licenses for most software are designed to take away your -freedom to share and change it. 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Scheduling between threads is handled by -the kernel scheduler, just like scheduling between Unix processes. - - -REQUIREMENTS: - -- Linux version 2.0 and up (requires the new clone() system call - and the new realtime scheduler). - -- For Intel platforms: libc 5.2.18 or later is required. - 5.2.18 or 5.4.12 or later are recommended; - 5.3.12 and 5.4.7 have problems (see the FAQ.html file for more info). - -- Also supports glibc 2 (a.k.a. libc 6), which actually comes with - a specially-adapted version of this library. - -- Currently supports Intel, Alpha, Sparc, Motorola 68k, ARM and MIPS - platforms. - -- Multiprocessors are supported. - - -INSTALLATION: - -- Edit the Makefile, set the variables in the "Configuration" section. - -- Do "make". - -- Do "make install". - - -USING LINUXTHREADS: - - gcc -D_REENTRANT ... -lpthread - -A complete set of manual pages is included. Also see the subdirectory -Examples/ for some sample programs. - - -STATUS: - -- All functions in the Posix 1003.1c base interface implemented. - Also supports priority scheduling. - -- For users of libc 5 (H.J.Lu's libc), a number of C library functions - are reimplemented or wrapped to make them thread-safe, including: - * malloc functions - * stdio functions (define _REENTRANT before including <stdio.h>) - * per-thread errno variable (define _REENTRANT before including <errno.h>) - * directory reading functions (opendir(), etc) - * sleep() - * gmtime(), localtime() - - New library functions provided: - * flockfile(), funlockfile(), ftrylockfile() - * reentrant versions of network database functions (gethostbyname_r(), etc) - and password functions (getpwnam_r(), etc). - -- libc 6 (glibc 2) provides much better thread support than libc 5, - and comes with a specially-adapted version of LinuxThreads. - For serious multithreaded programming, you should consider switching - to glibc 2. It is available from ftp.gnu.org:/pub/gnu and its mirrors. - - -WARNING: - -Many existing libraries are not compatible with LinuxThreads, -either because they are not inherently thread-safe, or because they -have not been compiled with the -D_REENTRANT. For more info, see the -FAQ.html file in this directory. - -A prime example of the latter is Xlib. If you link it with -LinuxThreads, you'll probably get an "unknown 0 error" very -early. This is just a consequence of the Xlib binaries using the -global variable "errno" to fetch error codes, while LinuxThreads and -the C library use the per-thread "errno" location. - -See the file README.Xfree3.3 for info on how to compile the Xfree 3.3 -libraries to make them compatible with LinuxThreads. - - -KNOWN BUGS AND LIMITATIONS: - -- Threads share pretty much everything they should share according - to the standard: memory space, file descriptors, signal handlers, - current working directory, etc. One thing that they do not share - is their pid's and parent pid's. According to the standard, they - should have the same, but that's one thing we cannot achieve - in this implementation (until the CLONE_PID flag to clone() becomes - usable). - -- The current implementation uses the two signals SIGUSR1 and SIGUSR2, - so user-level code cannot employ them. Ideally, there should be two - signals reserved for this library. One signal is used for restarting - threads blocked on mutexes or conditions; the other is for thread - cancellation. - - *** This is not anymore true when the application runs on a kernel - newer than approximately 2.1.60. - -- The stacks for the threads are allocated high in the memory space, - below the stack of the initial process, and spaced 2M apart. - Stacks are allocated with the "grow on demand" flag, so they don't - use much virtual space initially (4k, currently), but can grow - up to 2M if needed. - - Reserving such a large address space for each thread means that, - on a 32-bit architecture, no more than about 1000 threads can - coexist (assuming a 2Gb address space for user processes), - but this is reasonable, since each thread uses up one entry in the - kernel's process table, which is usually limited to 512 processes. - - Another potential problem of the "grow on demand" scheme is that - nothing prevents the user from mmap'ing something in the 2M address - window reserved for a thread stack, possibly causing later extensions of - that stack to fail. Mapping at fixed addresses should be avoided - when using this library. - -- Signal handling does not fully conform to the Posix standard, - due to the fact that threads are here distinct processes that can be - sent signals individually, so there's no notion of sending a signal - to "the" process (the collection of all threads). - More precisely, here is a summary of the standard requirements - and how they are met by the implementation: - - 1- Synchronous signals (generated by the thread execution, e.g. SIGFPE) - are delivered to the thread that raised them. - (OK.) - - 2- A fatal asynchronous signal terminates all threads in the process. - (OK. The thread manager notices when a thread dies on a signal - and kills all other threads with the same signal.) - - 3- An asynchronous signal will be delivered to one of the threads - of the program which does not block the signal (it is unspecified - which). - (No, the signal is delivered to the thread it's been sent to, - based on the pid of the thread. If that thread is currently - blocking the signal, the signal remains pending.) - - 4- The signal will be delivered to at most one thread. - (OK, except for signals generated from the terminal or sent to - the process group, which will be delivered to all threads.) - -- The current implementation of the MIPS support assumes a MIPS ISA II - processor or better. These processors support atomic operations by - ll/sc instructions. Older R2000/R3000 series processors are not - supported yet; support for these will have higher overhead. - -- The current implementation of the ARM support assumes that the SWP - (atomic swap register with memory) instruction is available. This is - the case for all processors except for the ARM1 and ARM2. On StrongARM, - the SWP instruction does not bypass the cache, so multi-processor support - will be more troublesome. diff --git a/libpthread/linuxthreads/attr.c b/libpthread/linuxthreads/attr.c deleted file mode 100644 index 4432a04d1..000000000 --- a/libpthread/linuxthreads/attr.c +++ /dev/null @@ -1,214 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* changed for uClibc */ -#define __sched_get_priority_min sched_get_priority_min -#define __sched_get_priority_max sched_get_priority_max - -/* Handling of thread attributes */ - -#include <errno.h> -#include <string.h> -#include <unistd.h> -#include <sys/param.h> -#include "pthread.h" -#include "internals.h" - -extern int __getpagesize(void); - -/* NOTE: With uClibc I don't think we need this versioning stuff. - * Therefore, define the function pthread_attr_init() here using - * a strong symbol. */ - -//int __pthread_attr_init_2_1(pthread_attr_t *attr) -int pthread_attr_init(pthread_attr_t *attr) -{ - size_t ps = __getpagesize (); - - attr->__detachstate = PTHREAD_CREATE_JOINABLE; - attr->__schedpolicy = SCHED_OTHER; - attr->__schedparam.sched_priority = 0; - attr->__inheritsched = PTHREAD_EXPLICIT_SCHED; - attr->__scope = PTHREAD_SCOPE_SYSTEM; - attr->__guardsize = ps; - attr->__stackaddr = NULL; - attr->__stackaddr_set = 0; - attr->__stacksize = STACK_SIZE - ps; - return 0; -} - -/* uClibc: leave out this for now. */ -#if DO_PTHREAD_VERSIONING_WITH_UCLIBC -#if defined __HAVE_ELF__ && defined __PIC__ && defined DO_VERSIONING -default_symbol_version (__pthread_attr_init_2_1, pthread_attr_init, GLIBC_2.1); - -int __pthread_attr_init_2_0(pthread_attr_t *attr) -{ - attr->__detachstate = PTHREAD_CREATE_JOINABLE; - attr->__schedpolicy = SCHED_OTHER; - attr->__schedparam.sched_priority = 0; - attr->__inheritsched = PTHREAD_EXPLICIT_SCHED; - attr->__scope = PTHREAD_SCOPE_SYSTEM; - return 0; -} -symbol_version (__pthread_attr_init_2_0, pthread_attr_init, GLIBC_2.0); -#else -strong_alias (__pthread_attr_init_2_1, pthread_attr_init) -#endif -#endif /* DO_PTHREAD_VERSIONING_WITH_UCLIBC */ - -int pthread_attr_destroy(pthread_attr_t *attr) -{ - return 0; -} - -int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate) -{ - if (detachstate < PTHREAD_CREATE_JOINABLE || - detachstate > PTHREAD_CREATE_DETACHED) - return EINVAL; - attr->__detachstate = detachstate; - return 0; -} - -int pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate) -{ - *detachstate = attr->__detachstate; - return 0; -} - -int pthread_attr_setschedparam(pthread_attr_t *attr, - const struct sched_param *param) -{ - int max_prio = __sched_get_priority_max(attr->__schedpolicy); - int min_prio = __sched_get_priority_min(attr->__schedpolicy); - - if (param->sched_priority < min_prio || param->sched_priority > max_prio) - return EINVAL; - memcpy (&attr->__schedparam, param, sizeof (struct sched_param)); - return 0; -} - -int pthread_attr_getschedparam(const pthread_attr_t *attr, - struct sched_param *param) -{ - memcpy (param, &attr->__schedparam, sizeof (struct sched_param)); - return 0; -} - -int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy) -{ - if (policy != SCHED_OTHER && policy != SCHED_FIFO && policy != SCHED_RR) - return EINVAL; - attr->__schedpolicy = policy; - return 0; -} - -int pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy) -{ - *policy = attr->__schedpolicy; - return 0; -} - -int pthread_attr_setinheritsched(pthread_attr_t *attr, int inherit) -{ - if (inherit != PTHREAD_INHERIT_SCHED && inherit != PTHREAD_EXPLICIT_SCHED) - return EINVAL; - attr->__inheritsched = inherit; - return 0; -} - -int pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inherit) -{ - *inherit = attr->__inheritsched; - return 0; -} - -int pthread_attr_setscope(pthread_attr_t *attr, int scope) -{ - switch (scope) { - case PTHREAD_SCOPE_SYSTEM: - attr->__scope = scope; - return 0; - case PTHREAD_SCOPE_PROCESS: - return ENOTSUP; - default: - return EINVAL; - } -} - -int pthread_attr_getscope(const pthread_attr_t *attr, int *scope) -{ - *scope = attr->__scope; - return 0; -} - -int __pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize) -{ - size_t ps = __getpagesize (); - - /* First round up the guard size. */ - guardsize = roundup (guardsize, ps); - - /* The guard size must not be larger than the stack itself */ - if (guardsize >= attr->__stacksize) return EINVAL; - - attr->__guardsize = guardsize; - - return 0; -} -weak_alias (__pthread_attr_setguardsize, pthread_attr_setguardsize) - -int __pthread_attr_getguardsize(const pthread_attr_t *attr, size_t *guardsize) -{ - *guardsize = attr->__guardsize; - return 0; -} -weak_alias (__pthread_attr_getguardsize, pthread_attr_getguardsize) - -int __pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr) -{ - attr->__stackaddr = stackaddr; - attr->__stackaddr_set = 1; - return 0; -} -weak_alias (__pthread_attr_setstackaddr, pthread_attr_setstackaddr) - -int __pthread_attr_getstackaddr(const pthread_attr_t *attr, void **stackaddr) -{ - /* XXX This function has a stupid definition. The standard specifies - no error value but what is if no stack address was set? We simply - return the value we have in the member. */ - *stackaddr = attr->__stackaddr; - return 0; -} -weak_alias (__pthread_attr_getstackaddr, pthread_attr_getstackaddr) - -int __pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize) -{ - /* We don't accept value smaller than PTHREAD_STACK_MIN. */ - if (stacksize < PTHREAD_STACK_MIN) - return EINVAL; - - attr->__stacksize = stacksize; - return 0; -} -weak_alias (__pthread_attr_setstacksize, pthread_attr_setstacksize) - -int __pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *stacksize) -{ - *stacksize = attr->__stacksize; - return 0; -} -weak_alias (__pthread_attr_getstacksize, pthread_attr_getstacksize) diff --git a/libpthread/linuxthreads/cancel.c b/libpthread/linuxthreads/cancel.c deleted file mode 100644 index 1356348a7..000000000 --- a/libpthread/linuxthreads/cancel.c +++ /dev/null @@ -1,184 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Thread cancellation */ - -#define __FORCE_GLIBC -#include <features.h> -#include <errno.h> -#include "pthread.h" -#include "internals.h" -#include "spinlock.h" -#include "restart.h" -#ifdef __UCLIBC_HAS_RPC__ -#include <rpc/rpc.h> -extern void __rpc_thread_destroy(void); -#endif - - -int pthread_setcancelstate(int state, int * oldstate) -{ - pthread_descr self = thread_self(); - if (state < PTHREAD_CANCEL_ENABLE || state > PTHREAD_CANCEL_DISABLE) - return EINVAL; - if (oldstate != NULL) *oldstate = THREAD_GETMEM(self, p_cancelstate); - THREAD_SETMEM(self, p_cancelstate, state); - if (THREAD_GETMEM(self, p_canceled) && - THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE && - THREAD_GETMEM(self, p_canceltype) == PTHREAD_CANCEL_ASYNCHRONOUS) - pthread_exit(PTHREAD_CANCELED); - return 0; -} - -int pthread_setcanceltype(int type, int * oldtype) -{ - pthread_descr self = thread_self(); - if (type < PTHREAD_CANCEL_DEFERRED || type > PTHREAD_CANCEL_ASYNCHRONOUS) - return EINVAL; - if (oldtype != NULL) *oldtype = THREAD_GETMEM(self, p_canceltype); - THREAD_SETMEM(self, p_canceltype, type); - if (THREAD_GETMEM(self, p_canceled) && - THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE && - THREAD_GETMEM(self, p_canceltype) == PTHREAD_CANCEL_ASYNCHRONOUS) - pthread_exit(PTHREAD_CANCELED); - return 0; -} - -int pthread_cancel(pthread_t thread) -{ - pthread_handle handle = thread_handle(thread); - int pid; - int dorestart = 0; - pthread_descr th; - pthread_extricate_if *pextricate; - - __pthread_lock(&handle->h_lock, NULL); - if (invalid_handle(handle, thread)) { - __pthread_unlock(&handle->h_lock); - return ESRCH; - } - - th = handle->h_descr; - - if (th->p_canceled) { - __pthread_unlock(&handle->h_lock); - return 0; - } - - pextricate = th->p_extricate; - th->p_canceled = 1; - pid = th->p_pid; - - /* If the thread has registered an extrication interface, then - invoke the interface. If it returns 1, then we succeeded in - dequeuing the thread from whatever waiting object it was enqueued - with. In that case, it is our responsibility to wake it up. - And also to set the p_woken_by_cancel flag so the woken thread - can tell that it was woken by cancellation. */ - - if (pextricate != NULL) { - dorestart = pextricate->pu_extricate_func(pextricate->pu_object, th); - th->p_woken_by_cancel = dorestart; - } - - __pthread_unlock(&handle->h_lock); - - /* If the thread has suspended or is about to, then we unblock it by - issuing a restart, instead of a cancel signal. Otherwise we send - the cancel signal to unblock the thread from a cancellation point, - or to initiate asynchronous cancellation. The restart is needed so - we have proper accounting of restarts; suspend decrements the thread's - resume count, and restart() increments it. This also means that suspend's - handling of the cancel signal is obsolete. */ - - if (dorestart) - restart(th); - else - kill(pid, __pthread_sig_cancel); - - return 0; -} - -void pthread_testcancel(void) -{ - pthread_descr self = thread_self(); - if (THREAD_GETMEM(self, p_canceled) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) - pthread_exit(PTHREAD_CANCELED); -} - -void _pthread_cleanup_push(struct _pthread_cleanup_buffer * buffer, - void (*routine)(void *), void * arg) -{ - pthread_descr self = thread_self(); - buffer->__routine = routine; - buffer->__arg = arg; - buffer->__prev = THREAD_GETMEM(self, p_cleanup); - THREAD_SETMEM(self, p_cleanup, buffer); -} - -void _pthread_cleanup_pop(struct _pthread_cleanup_buffer * buffer, - int execute) -{ - pthread_descr self = thread_self(); - if (execute) buffer->__routine(buffer->__arg); - THREAD_SETMEM(self, p_cleanup, buffer->__prev); -} - -void _pthread_cleanup_push_defer(struct _pthread_cleanup_buffer * buffer, - void (*routine)(void *), void * arg) -{ - pthread_descr self = thread_self(); - buffer->__routine = routine; - buffer->__arg = arg; - buffer->__canceltype = THREAD_GETMEM(self, p_canceltype); - buffer->__prev = THREAD_GETMEM(self, p_cleanup); - THREAD_SETMEM(self, p_canceltype, PTHREAD_CANCEL_DEFERRED); - THREAD_SETMEM(self, p_cleanup, buffer); -} - -void _pthread_cleanup_pop_restore(struct _pthread_cleanup_buffer * buffer, - int execute) -{ - pthread_descr self = thread_self(); - if (execute) buffer->__routine(buffer->__arg); - THREAD_SETMEM(self, p_cleanup, buffer->__prev); - THREAD_SETMEM(self, p_canceltype, buffer->__canceltype); - if (THREAD_GETMEM(self, p_canceled) && - THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE && - THREAD_GETMEM(self, p_canceltype) == PTHREAD_CANCEL_ASYNCHRONOUS) - pthread_exit(PTHREAD_CANCELED); -} - -void __pthread_perform_cleanup(void) -{ - pthread_descr self = thread_self(); - struct _pthread_cleanup_buffer * c; - for (c = THREAD_GETMEM(self, p_cleanup); c != NULL; c = c->__prev) - c->__routine(c->__arg); - -#ifdef __UCLIBC_HAS_RPC__ - /* And the TSD which needs special help. */ - if (THREAD_GETMEM(self, p_libc_specific[_LIBC_TSD_KEY_RPC_VARS]) != NULL) - __rpc_thread_destroy (); -#endif -} - -#ifndef __PIC__ -/* We need a hook to force the cancelation wrappers to be linked in when - static libpthread is used. */ -extern const int __pthread_provide_wrappers; -static const int * const __pthread_require_wrappers = - &__pthread_provide_wrappers; -#endif diff --git a/libpthread/linuxthreads/condvar.c b/libpthread/linuxthreads/condvar.c deleted file mode 100644 index f9c46a331..000000000 --- a/libpthread/linuxthreads/condvar.c +++ /dev/null @@ -1,296 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* and Pavel Krauz (krauz@fsid.cvut.cz). */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Condition variables */ - -#include <errno.h> -#include <sched.h> -#include <stddef.h> -#include <sys/time.h> -#include "pthread.h" -#include "internals.h" -#include "spinlock.h" -#include "queue.h" -#include "restart.h" - -int pthread_cond_init(pthread_cond_t *cond, - const pthread_condattr_t *cond_attr) -{ - __pthread_init_lock(&cond->__c_lock); - cond->__c_waiting = NULL; - return 0; -} - -int pthread_cond_destroy(pthread_cond_t *cond) -{ - if (cond->__c_waiting != NULL) return EBUSY; - return 0; -} - -/* Function called by pthread_cancel to remove the thread from - waiting on a condition variable queue. */ - -static int cond_extricate_func(void *obj, pthread_descr th) -{ - volatile pthread_descr self = thread_self(); - pthread_cond_t *cond = obj; - int did_remove = 0; - - __pthread_lock(&cond->__c_lock, self); - did_remove = remove_from_queue(&cond->__c_waiting, th); - __pthread_unlock(&cond->__c_lock); - - return did_remove; -} - -int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) -{ - volatile pthread_descr self = thread_self(); - pthread_extricate_if extr; - int already_canceled = 0; - int spurious_wakeup_count; - - /* Check whether the mutex is locked and owned by this thread. */ - if (mutex->__m_kind != PTHREAD_MUTEX_TIMED_NP - && mutex->__m_kind != PTHREAD_MUTEX_ADAPTIVE_NP - && mutex->__m_owner != self) - return EINVAL; - - /* Set up extrication interface */ - extr.pu_object = cond; - extr.pu_extricate_func = cond_extricate_func; - - /* Register extrication interface */ - THREAD_SETMEM(self, p_condvar_avail, 0); - __pthread_set_own_extricate_if(self, &extr); - - /* Atomically enqueue thread for waiting, but only if it is not - canceled. If the thread is canceled, then it will fall through the - suspend call below, and then call pthread_exit without - having to worry about whether it is still on the condition variable queue. - This depends on pthread_cancel setting p_canceled before calling the - extricate function. */ - - __pthread_lock(&cond->__c_lock, self); - if (!(THREAD_GETMEM(self, p_canceled) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE)) - enqueue(&cond->__c_waiting, self); - else - already_canceled = 1; - __pthread_unlock(&cond->__c_lock); - - if (already_canceled) { - __pthread_set_own_extricate_if(self, 0); - pthread_exit(PTHREAD_CANCELED); - } - - pthread_mutex_unlock(mutex); - - spurious_wakeup_count = 0; - while (1) - { - suspend(self); - if (THREAD_GETMEM(self, p_condvar_avail) == 0 - && (THREAD_GETMEM(self, p_woken_by_cancel) == 0 - || THREAD_GETMEM(self, p_cancelstate) != PTHREAD_CANCEL_ENABLE)) - { - /* Count resumes that don't belong to us. */ - spurious_wakeup_count++; - continue; - } - break; - } - - __pthread_set_own_extricate_if(self, 0); - - /* Check for cancellation again, to provide correct cancellation - point behavior */ - - if (THREAD_GETMEM(self, p_woken_by_cancel) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) { - THREAD_SETMEM(self, p_woken_by_cancel, 0); - pthread_mutex_lock(mutex); - pthread_exit(PTHREAD_CANCELED); - } - - /* Put back any resumes we caught that don't belong to us. */ - while (spurious_wakeup_count--) - restart(self); - - pthread_mutex_lock(mutex); - return 0; -} - -static int -pthread_cond_timedwait_relative(pthread_cond_t *cond, - pthread_mutex_t *mutex, - const struct timespec * abstime) -{ - volatile pthread_descr self = thread_self(); - int already_canceled = 0; - pthread_extricate_if extr; - int spurious_wakeup_count; - - /* Check whether the mutex is locked and owned by this thread. */ - if (mutex->__m_kind != PTHREAD_MUTEX_TIMED_NP - && mutex->__m_kind != PTHREAD_MUTEX_ADAPTIVE_NP - && mutex->__m_owner != self) - return EINVAL; - - /* Set up extrication interface */ - extr.pu_object = cond; - extr.pu_extricate_func = cond_extricate_func; - - /* Register extrication interface */ - THREAD_SETMEM(self, p_condvar_avail, 0); - __pthread_set_own_extricate_if(self, &extr); - - /* Enqueue to wait on the condition and check for cancellation. */ - __pthread_lock(&cond->__c_lock, self); - if (!(THREAD_GETMEM(self, p_canceled) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE)) - enqueue(&cond->__c_waiting, self); - else - already_canceled = 1; - __pthread_unlock(&cond->__c_lock); - - if (already_canceled) { - __pthread_set_own_extricate_if(self, 0); - pthread_exit(PTHREAD_CANCELED); - } - - pthread_mutex_unlock(mutex); - - spurious_wakeup_count = 0; - while (1) - { - if (!timedsuspend(self, abstime)) { - int was_on_queue; - - /* __pthread_lock will queue back any spurious restarts that - may happen to it. */ - - __pthread_lock(&cond->__c_lock, self); - was_on_queue = remove_from_queue(&cond->__c_waiting, self); - __pthread_unlock(&cond->__c_lock); - - if (was_on_queue) { - __pthread_set_own_extricate_if(self, 0); - pthread_mutex_lock(mutex); - return ETIMEDOUT; - } - - /* Eat the outstanding restart() from the signaller */ - suspend(self); - } - - if (THREAD_GETMEM(self, p_condvar_avail) == 0 - && (THREAD_GETMEM(self, p_woken_by_cancel) == 0 - || THREAD_GETMEM(self, p_cancelstate) != PTHREAD_CANCEL_ENABLE)) - { - /* Count resumes that don't belong to us. */ - spurious_wakeup_count++; - continue; - } - break; - } - - __pthread_set_own_extricate_if(self, 0); - - /* The remaining logic is the same as in other cancellable waits, - such as pthread_join sem_wait or pthread_cond wait. */ - - if (THREAD_GETMEM(self, p_woken_by_cancel) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) { - THREAD_SETMEM(self, p_woken_by_cancel, 0); - pthread_mutex_lock(mutex); - pthread_exit(PTHREAD_CANCELED); - } - - /* Put back any resumes we caught that don't belong to us. */ - while (spurious_wakeup_count--) - restart(self); - - pthread_mutex_lock(mutex); - return 0; -} - -int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, - const struct timespec * abstime) -{ - /* Indirect call through pointer! */ - return pthread_cond_timedwait_relative(cond, mutex, abstime); -} - -int pthread_cond_signal(pthread_cond_t *cond) -{ - pthread_descr th; - - __pthread_lock(&cond->__c_lock, NULL); - th = dequeue(&cond->__c_waiting); - __pthread_unlock(&cond->__c_lock); - if (th != NULL) { - th->p_condvar_avail = 1; - WRITE_MEMORY_BARRIER(); - restart(th); - } - return 0; -} - -int pthread_cond_broadcast(pthread_cond_t *cond) -{ - pthread_descr tosignal, th; - - __pthread_lock(&cond->__c_lock, NULL); - /* Copy the current state of the waiting queue and empty it */ - tosignal = cond->__c_waiting; - cond->__c_waiting = NULL; - __pthread_unlock(&cond->__c_lock); - /* Now signal each process in the queue */ - while ((th = dequeue(&tosignal)) != NULL) { - th->p_condvar_avail = 1; - WRITE_MEMORY_BARRIER(); - restart(th); - } - return 0; -} - -int pthread_condattr_init(pthread_condattr_t *attr) -{ - return 0; -} - -int pthread_condattr_destroy(pthread_condattr_t *attr) -{ - return 0; -} - -int pthread_condattr_getpshared (const pthread_condattr_t *attr, int *pshared) -{ - *pshared = PTHREAD_PROCESS_PRIVATE; - return 0; -} - -int pthread_condattr_setpshared (pthread_condattr_t *attr, int pshared) -{ - if (pshared != PTHREAD_PROCESS_PRIVATE && pshared != PTHREAD_PROCESS_SHARED) - return EINVAL; - - /* For now it is not possible to shared a conditional variable. */ - if (pshared != PTHREAD_PROCESS_PRIVATE) - return ENOSYS; - - return 0; -} diff --git a/libpthread/linuxthreads/debug.h b/libpthread/linuxthreads/debug.h deleted file mode 100644 index a2ac5113a..000000000 --- a/libpthread/linuxthreads/debug.h +++ /dev/null @@ -1,56 +0,0 @@ -/**************************************************************************** -** -** NAME: -** debug.h -** -** DESCRIPTION: -** This header file defines the debug macros used in pthreads. To turn -** debugging on, add -DDEBUG_PT to CFLAGS. It was added to the original -** distribution of linuxthreads. -** -** This program is free software; you can redistribute it and/or -** modify it under the terms of the GNU Library General Public License -** as published by the Free Software Foundation; either version 2 -** of the License, or (at your option) any later version. -** -** This program is distributed in the hope that it will be useful, -** but WITHOUT ANY WARRANTY; without even the implied warranty of -** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -** GNU Library General Public License for more details. -** -****************************************************************************/ - -#ifndef _PT_DEBUG_H -#define _PT_DEBUG_H - -#include <features.h> - -#ifdef __DODEBUG_PT__ -# define DEBUG_PT -#endif - -/* include asserts for now */ -#define DO_ASSERT - -/* define the PDEBUG macro here */ -#undef PDEBUG -#ifdef DEBUG_PT -# define PDEBUG(fmt, args...) __pthread_message("%s: " fmt, __FUNCTION__, ## args) -#else -# define PDEBUG(fmt, args...) /* debug switched off */ -#endif - -/* nothing; placeholder to disable a PDEBUG message but don't delete it */ -#undef PDEBUGG -#define PDEBUGG(fmt, args...) - -/* Define ASSERT to stop/warn. Should be void in production code */ -#undef ASSERT -#ifdef DO_ASSERT -# define ASSERT(x) if (!(x)) fprintf(stderr, "pt: assertion failed in %s:%i.\n",\ - __FILE__, __LINE__) -#else -# define ASSERT(x) -#endif - -#endif /* _PT_DEBUG_H */ diff --git a/libpthread/linuxthreads/errno.c b/libpthread/linuxthreads/errno.c deleted file mode 100644 index f5778f98a..000000000 --- a/libpthread/linuxthreads/errno.c +++ /dev/null @@ -1,37 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Define the location of errno for the remainder of the C library */ - -#define __FORCE_GLIBC -#include <features.h> -#include <errno.h> -#include <netdb.h> -#include "pthread.h" -#include "internals.h" -#include <stdio.h> - -int * -__errno_location (void) -{ - pthread_descr self = thread_self(); - return THREAD_GETMEM (self, p_errnop); -} - -int * -__h_errno_location (void) -{ - pthread_descr self = thread_self(); - return THREAD_GETMEM (self, p_h_errnop); -} diff --git a/libpthread/linuxthreads/events.c b/libpthread/linuxthreads/events.c deleted file mode 100644 index a4bf1f898..000000000 --- a/libpthread/linuxthreads/events.c +++ /dev/null @@ -1,37 +0,0 @@ -/* Event functions used while debugging. - Copyright (C) 1999 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -/* The functions contained here do nothing, they just return. */ - -#include "internals.h" - -void -__linuxthreads_create_event (void) -{ -} - -void -__linuxthreads_death_event (void) -{ -} - -void -__linuxthreads_reap_event (void) -{ -} diff --git a/libpthread/linuxthreads/internals.h b/libpthread/linuxthreads/internals.h deleted file mode 100644 index 50a4d2d59..000000000 --- a/libpthread/linuxthreads/internals.h +++ /dev/null @@ -1,518 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -#ifndef _INTERNALS_H -#define _INTERNALS_H 1 - -/* Internal data structures */ - -/* Includes */ - -#include <bits/libc-tsd.h> /* for _LIBC_TSD_KEY_N */ -#include <limits.h> -#include <setjmp.h> -#include <signal.h> -#include <unistd.h> -#include <sys/types.h> -#include "pt-machine.h" -#include "semaphore.h" -#include "../linuxthreads_db/thread_dbP.h" -#ifdef __UCLIBC_HAS_XLOCALE__ -#include <bits/uClibc_locale.h> -#endif /* __UCLIBC_HAS_XLOCALE__ */ - -/* Use a funky version in a probably vein attempt at preventing gdb - * from dlopen()'ing glibc's libthread_db library... */ -#define STRINGIFY(s) STRINGIFY2 (s) -#define STRINGIFY2(s) #s -#define VERSION STRINGIFY(__UCLIBC_MAJOR__) "." STRINGIFY(__UCLIBC_MINOR__) "." STRINGIFY(__UCLIBC_SUBLEVEL__) - -#ifndef THREAD_GETMEM -# define THREAD_GETMEM(descr, member) descr->member -#endif -#ifndef THREAD_GETMEM_NC -# define THREAD_GETMEM_NC(descr, member) descr->member -#endif -#ifndef THREAD_SETMEM -# define THREAD_SETMEM(descr, member, value) descr->member = (value) -#endif -#ifndef THREAD_SETMEM_NC -# define THREAD_SETMEM_NC(descr, member, value) descr->member = (value) -#endif - -/* Arguments passed to thread creation routine */ - -struct pthread_start_args { - void * (*start_routine)(void *); /* function to run */ - void * arg; /* its argument */ - sigset_t mask; /* initial signal mask for thread */ - int schedpolicy; /* initial scheduling policy (if any) */ - struct sched_param schedparam; /* initial scheduling parameters (if any) */ -}; - - -/* We keep thread specific data in a special data structure, a two-level - array. The top-level array contains pointers to dynamically allocated - arrays of a certain number of data pointers. So we can implement a - sparse array. Each dynamic second-level array has - PTHREAD_KEY_2NDLEVEL_SIZE - entries. This value shouldn't be too large. */ -#define PTHREAD_KEY_2NDLEVEL_SIZE 32 - -/* We need to address PTHREAD_KEYS_MAX key with PTHREAD_KEY_2NDLEVEL_SIZE - keys in each subarray. */ -#define PTHREAD_KEY_1STLEVEL_SIZE \ - ((PTHREAD_KEYS_MAX + PTHREAD_KEY_2NDLEVEL_SIZE - 1) \ - / PTHREAD_KEY_2NDLEVEL_SIZE) - -typedef void (*destr_function)(void *); - -struct pthread_key_struct { - int in_use; /* already allocated? */ - destr_function destr; /* destruction routine */ -}; - - -#define PTHREAD_START_ARGS_INITIALIZER { NULL, NULL, {{0, }}, 0, { 0 } } - -/* The type of thread descriptors */ - -typedef struct _pthread_descr_struct * pthread_descr; - -/* Callback interface for removing the thread from waiting on an - object if it is cancelled while waiting or about to wait. - This hold a pointer to the object, and a pointer to a function - which ``extricates'' the thread from its enqueued state. - The function takes two arguments: pointer to the wait object, - and a pointer to the thread. It returns 1 if an extrication - actually occured, and hence the thread must also be signalled. - It returns 0 if the thread had already been extricated. */ - -typedef struct _pthread_extricate_struct { - void *pu_object; - int (*pu_extricate_func)(void *, pthread_descr); -} pthread_extricate_if; - -/* Atomic counter made possible by compare_and_swap */ - -struct pthread_atomic { - long p_count; - int p_spinlock; -}; - -/* Context info for read write locks. The pthread_rwlock_info structure - is information about a lock that has been read-locked by the thread - in whose list this structure appears. The pthread_rwlock_context - is embedded in the thread context and contains a pointer to the - head of the list of lock info structures, as well as a count of - read locks that are untracked, because no info structure could be - allocated for them. */ - -struct _pthread_rwlock_t; - -typedef struct _pthread_rwlock_info { - struct _pthread_rwlock_info *pr_next; - struct _pthread_rwlock_t *pr_lock; - int pr_lock_count; -} pthread_readlock_info; - -struct _pthread_descr_struct { - pthread_descr p_nextlive, p_prevlive; - /* Double chaining of active threads */ - pthread_descr p_nextwaiting; /* Next element in the queue holding the thr */ - pthread_descr p_nextlock; /* can be on a queue and waiting on a lock */ - pthread_t p_tid; /* Thread identifier */ - int p_pid; /* PID of Unix process */ - int p_priority; /* Thread priority (== 0 if not realtime) */ - struct _pthread_fastlock * p_lock; /* Spinlock for synchronized accesses */ - int p_signal; /* last signal received */ - sigjmp_buf * p_signal_jmp; /* where to siglongjmp on a signal or NULL */ - sigjmp_buf * p_cancel_jmp; /* where to siglongjmp on a cancel or NULL */ - char p_terminated; /* true if terminated e.g. by pthread_exit */ - char p_detached; /* true if detached */ - char p_exited; /* true if the assoc. process terminated */ - void * p_retval; /* placeholder for return value */ - int p_retcode; /* placeholder for return code */ - pthread_descr p_joining; /* thread joining on that thread or NULL */ - struct _pthread_cleanup_buffer * p_cleanup; /* cleanup functions */ - char p_cancelstate; /* cancellation state */ - char p_canceltype; /* cancellation type (deferred/async) */ - char p_canceled; /* cancellation request pending */ - int * p_errnop; /* pointer to used errno variable */ - int p_errno; /* error returned by last system call */ - int * p_h_errnop; /* pointer to used h_errno variable */ - int p_h_errno; /* error returned by last netdb function */ - char * p_in_sighandler; /* stack address of sighandler, or NULL */ - char p_sigwaiting; /* true if a sigwait() is in progress */ - struct pthread_start_args p_start_args; /* arguments for thread creation */ - void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE]; /* thread-specific data */ - void * p_libc_specific[_LIBC_TSD_KEY_N]; /* thread-specific data for libc */ - int p_userstack; /* nonzero if the user provided the stack */ - void *p_guardaddr; /* address of guard area or NULL */ - size_t p_guardsize; /* size of guard area */ - pthread_descr p_self; /* Pointer to this structure */ - int p_nr; /* Index of descriptor in __pthread_handles */ - int p_report_events; /* Nonzero if events must be reported. */ - td_eventbuf_t p_eventbuf; /* Data for event. */ - struct pthread_atomic p_resume_count; /* number of times restart() was - called on thread */ - char p_woken_by_cancel; /* cancellation performed wakeup */ - char p_condvar_avail; /* flag if conditional variable became avail */ - char p_sem_avail; /* flag if semaphore became available */ - pthread_extricate_if *p_extricate; /* See above */ - pthread_readlock_info *p_readlock_list; /* List of readlock info structs */ - pthread_readlock_info *p_readlock_free; /* Free list of structs */ - int p_untracked_readlock_count; /* Readlocks not tracked by list */ - /* New elements must be added at the end. */ -#ifdef __UCLIBC_HAS_XLOCALE__ - __locale_t locale; /* thread-specific locale from uselocale() only! */ -#endif /* __UCLIBC_HAS_XLOCALE__ */ -} __attribute__ ((aligned(32))); /* We need to align the structure so that - doubles are aligned properly. This is 8 - bytes on MIPS and 16 bytes on MIPS64. - 32 bytes might give better cache - utilization. */ - -/* The type of thread handles. */ - -typedef struct pthread_handle_struct * pthread_handle; - -struct pthread_handle_struct { - struct _pthread_fastlock h_lock; /* Fast lock for sychronized access */ - pthread_descr h_descr; /* Thread descriptor or NULL if invalid */ - char * h_bottom; /* Lowest address in the stack thread */ -}; - -/* The type of messages sent to the thread manager thread */ - -struct pthread_request { - pthread_descr req_thread; /* Thread doing the request */ - enum { /* Request kind */ - REQ_CREATE, REQ_FREE, REQ_PROCESS_EXIT, REQ_MAIN_THREAD_EXIT, - REQ_POST, REQ_DEBUG, REQ_KICK - } req_kind; - union { /* Arguments for request */ - struct { /* For REQ_CREATE: */ - const pthread_attr_t * attr; /* thread attributes */ - void * (*fn)(void *); /* start function */ - void * arg; /* argument to start function */ - sigset_t mask; /* signal mask */ - } create; - struct { /* For REQ_FREE: */ - pthread_t thread_id; /* identifier of thread to free */ - } free; - struct { /* For REQ_PROCESS_EXIT: */ - int code; /* exit status */ - } exit; - void * post; /* For REQ_POST: the semaphore */ - } req_args; -}; - - -/* Signals used for suspend/restart and for cancellation notification. */ - -extern int __pthread_sig_restart; -extern int __pthread_sig_cancel; - -/* Signal used for interfacing with gdb */ - -extern int __pthread_sig_debug; - -/* Global array of thread handles, used for validating a thread id - and retrieving the corresponding thread descriptor. Also used for - mapping the available stack segments. */ - -extern struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX]; - -/* Descriptor of the initial thread */ - -extern struct _pthread_descr_struct __pthread_initial_thread; - -/* Descriptor of the manager thread */ - -extern struct _pthread_descr_struct __pthread_manager_thread; - -/* Descriptor of the main thread */ - -extern pthread_descr __pthread_main_thread; - -/* Limit between the stack of the initial thread (above) and the - stacks of other threads (below). Aligned on a STACK_SIZE boundary. - Initially 0, meaning that the current thread is (by definition) - the initial thread. */ - -/* For non-MMU systems also remember to stack top of the initial thread. - * This is adapted when other stacks are malloc'ed since we don't know - * the bounds a-priori. -StS */ - -extern char *__pthread_initial_thread_bos; -#ifndef __ARCH_HAS_MMU__ -extern char *__pthread_initial_thread_tos; -#define NOMMU_INITIAL_THREAD_BOUNDS(tos,bos) \ - if ((tos)>=__pthread_initial_thread_bos \ - && (bos)<__pthread_initial_thread_tos) \ - __pthread_initial_thread_bos = (tos)+1 -#else -#define NOMMU_INITIAL_THREAD_BOUNDS(tos,bos) /* empty */ -#endif /* __ARCH_HAS_MMU__ */ - - -/* Indicate whether at least one thread has a user-defined stack (if 1), - or all threads have stacks supplied by LinuxThreads (if 0). */ - -extern int __pthread_nonstandard_stacks; - -/* File descriptor for sending requests to the thread manager. - Initially -1, meaning that __pthread_initialize_manager must be called. */ - -extern int __pthread_manager_request; - -/* Other end of the pipe for sending requests to the thread manager. */ - -extern int __pthread_manager_reader; - -/* Limits of the thread manager stack. */ - -extern char *__pthread_manager_thread_bos; -extern char *__pthread_manager_thread_tos; - -/* Pending request for a process-wide exit */ - -extern int __pthread_exit_requested, __pthread_exit_code; - -/* Set to 1 by gdb if we're debugging */ - -extern volatile int __pthread_threads_debug; - -/* Globally enabled events. */ -extern volatile td_thr_events_t __pthread_threads_events; - -/* Pointer to descriptor of thread with last event. */ -extern volatile pthread_descr __pthread_last_event; - -/* Return the handle corresponding to a thread id */ - -static inline pthread_handle thread_handle(pthread_t id) -{ - return &__pthread_handles[id % PTHREAD_THREADS_MAX]; -} - -/* Validate a thread handle. Must have acquired h->h_spinlock before. */ - -static inline int invalid_handle(pthread_handle h, pthread_t id) -{ - return h->h_descr == NULL || h->h_descr->p_tid != id; -} - -/* Fill in defaults left unspecified by pt-machine.h. */ - -/* The page size we can get from the system. This should likely not be - changed by the machine file but, you never know. */ -extern size_t __pagesize; -#include <bits/uClibc_page.h> -#ifndef PAGE_SIZE -#define PAGE_SIZE (sysconf (_SC_PAGESIZE)) -#endif - -/* The max size of the thread stack segments. If the default - THREAD_SELF implementation is used, this must be a power of two and - a multiple of PAGE_SIZE. */ -#ifndef STACK_SIZE -#ifdef __ARCH_HAS_MMU__ -#define STACK_SIZE (2 * 1024 * 1024) -#else -#define STACK_SIZE (4 * __pagesize) -#endif -#endif - -/* The initial size of the thread stack. Must be a multiple of PAGE_SIZE. */ -#ifndef INITIAL_STACK_SIZE -#define INITIAL_STACK_SIZE (4 * __pagesize) -#endif - -/* Size of the thread manager stack. The "- 32" avoids wasting space - with some malloc() implementations. */ -#ifndef THREAD_MANAGER_STACK_SIZE -#define THREAD_MANAGER_STACK_SIZE (2 * __pagesize - 32) -#endif - -/* The base of the "array" of thread stacks. The array will grow down from - here. Defaults to the calculated bottom of the initial application - stack. */ -#ifndef THREAD_STACK_START_ADDRESS -#define THREAD_STACK_START_ADDRESS __pthread_initial_thread_bos -#endif - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#ifndef CURRENT_STACK_FRAME -#define CURRENT_STACK_FRAME ({ char __csf; &__csf; }) -#endif - -/* If MEMORY_BARRIER isn't defined in pt-machine.h, assume the - architecture doesn't need a memory barrier instruction (e.g. Intel - x86). Still we need the compiler to respect the barrier and emit - all outstanding operations which modify memory. Some architectures - distinguish between full, read and write barriers. */ -#ifndef MEMORY_BARRIER -#define MEMORY_BARRIER() asm ("" : : : "memory") -#endif -#ifndef READ_MEMORY_BARRIER -#define READ_MEMORY_BARRIER() MEMORY_BARRIER() -#endif -#ifndef WRITE_MEMORY_BARRIER -#define WRITE_MEMORY_BARRIER() MEMORY_BARRIER() -#endif - -/* Recover thread descriptor for the current thread */ - -extern pthread_descr __pthread_find_self (void) __attribute__ ((const)); - -static inline pthread_descr thread_self (void) __attribute__ ((const)); -static inline pthread_descr thread_self (void) -{ -#ifdef THREAD_SELF - return THREAD_SELF; -#else - char *sp = CURRENT_STACK_FRAME; -#ifdef __ARCH_HAS_MMU__ - if (sp >= __pthread_initial_thread_bos) - return &__pthread_initial_thread; - else if (sp >= __pthread_manager_thread_bos - && sp < __pthread_manager_thread_tos) - return &__pthread_manager_thread; - else if (__pthread_nonstandard_stacks) - return __pthread_find_self(); - else - return (pthread_descr)(((unsigned long)sp | (STACK_SIZE-1))+1) - 1; -#else - /* For non-MMU we need to be more careful about the initial thread stack. - * We refine the initial thread stack bounds dynamically as we allocate - * the other stack frame such that it doesn't overlap with them. Then - * we can be sure to pick the right thread according to the current SP */ - - /* Since we allow other stack frames to be above or below, we need to - * treat this case special. When pthread_initialize() wasn't called yet, - * only the initial thread is there. */ - if (__pthread_initial_thread_bos == NULL) { - return &__pthread_initial_thread; - } - else if (sp >= __pthread_initial_thread_bos - && sp < __pthread_initial_thread_tos) { - return &__pthread_initial_thread; - } - else if (sp >= __pthread_manager_thread_bos - && sp < __pthread_manager_thread_tos) { - return &__pthread_manager_thread; - } - else { - return __pthread_find_self(); - } -#endif /* __ARCH_HAS_MMU__ */ -#endif -} - -/* Max number of times we must spin on a spinlock calling sched_yield(). - After MAX_SPIN_COUNT iterations, we put the calling thread to sleep. */ - -#ifndef MAX_SPIN_COUNT -#define MAX_SPIN_COUNT 50 -#endif - -/* Duration of sleep (in nanoseconds) when we can't acquire a spinlock - after MAX_SPIN_COUNT iterations of sched_yield(). - With the 2.0 and 2.1 kernels, this MUST BE > 2ms. - (Otherwise the kernel does busy-waiting for realtime threads, - giving other threads no chance to run.) */ - -#ifndef SPIN_SLEEP_DURATION -#define SPIN_SLEEP_DURATION 2000001 -#endif - -/* Debugging */ - -#ifdef DEBUG -#include <assert.h> -#define ASSERT assert -#define MSG __pthread_message -#else -#define ASSERT(x) -#define MSG(msg,arg...) -#endif - -/* Internal global functions */ - -void __pthread_destroy_specifics(void); -void __pthread_perform_cleanup(void); -int __pthread_initialize_manager(void); -void __pthread_message(char * fmt, ...); -int __pthread_manager(void *reqfd); -int __pthread_manager_event(void *reqfd); -void __pthread_manager_sighandler(int sig); -void __pthread_reset_main_thread(void); -void __fresetlockfiles(void); -void __pthread_manager_adjust_prio(int thread_prio); -void __pthread_initialize_minimal (void); - -extern int __pthread_attr_setguardsize __P ((pthread_attr_t *__attr, - size_t __guardsize)); -extern int __pthread_attr_getguardsize __P ((__const pthread_attr_t *__attr, - size_t *__guardsize)); -extern int __pthread_attr_setstackaddr __P ((pthread_attr_t *__attr, - void *__stackaddr)); -extern int __pthread_attr_getstackaddr __P ((__const pthread_attr_t *__attr, - void **__stackaddr)); -extern int __pthread_attr_setstacksize __P ((pthread_attr_t *__attr, - size_t __stacksize)); -extern int __pthread_attr_getstacksize __P ((__const pthread_attr_t *__attr, - size_t *__stacksize)); -extern int __pthread_getconcurrency __P ((void)); -extern int __pthread_setconcurrency __P ((int __level)); -extern int __pthread_mutexattr_gettype __P ((__const pthread_mutexattr_t *__attr, - int *__kind)); -extern void __pthread_kill_other_threads_np __P ((void)); - -extern void __pthread_restart_old(pthread_descr th); -extern void __pthread_suspend_old(pthread_descr self); -extern int __pthread_timedsuspend_old(pthread_descr self, const struct timespec *abs); - -extern void __pthread_restart_new(pthread_descr th); -extern void __pthread_suspend_new(pthread_descr self); -extern int __pthread_timedsuspend_new(pthread_descr self, const struct timespec *abs); - -extern void __pthread_wait_for_restart_signal(pthread_descr self); - -/* Global pointers to old or new suspend functions */ - -extern void (*__pthread_restart)(pthread_descr); -extern void (*__pthread_suspend)(pthread_descr); - -/* Prototypes for the function without cancelation support when the - normal version has it. */ -extern int __libc_close (int fd); -extern int __libc_nanosleep (const struct timespec *requested_time, - struct timespec *remaining); -extern ssize_t __libc_read (int fd, void *buf, size_t count); -extern pid_t __libc_waitpid (pid_t pid, int *stat_loc, int options); -extern ssize_t __libc_write (int fd, const void *buf, size_t count); - -/* Prototypes for some of the new semaphore functions. */ -extern int __new_sem_post (sem_t * sem); - -/* The functions called the signal events. */ -extern void __linuxthreads_create_event (void); -extern void __linuxthreads_death_event (void); -extern void __linuxthreads_reap_event (void); - -#endif /* internals.h */ diff --git a/libpthread/linuxthreads/join.c b/libpthread/linuxthreads/join.c deleted file mode 100644 index 5aeec6a20..000000000 --- a/libpthread/linuxthreads/join.c +++ /dev/null @@ -1,221 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Thread termination and joining */ - -#include <features.h> -#define __USE_GNU -#include <errno.h> -#include <sched.h> -#include <unistd.h> -#include <stdlib.h> -#include "pthread.h" -#include "internals.h" -#include "spinlock.h" -#include "restart.h" -#include "debug.h" /* PDEBUG, added by StS */ - -void pthread_exit(void * retval) -{ - pthread_descr self = thread_self(); - pthread_descr joining; - struct pthread_request request; - PDEBUG("self=%p, pid=%d\n", self, self->p_pid); - - /* Reset the cancellation flag to avoid looping if the cleanup handlers - contain cancellation points */ - THREAD_SETMEM(self, p_canceled, 0); - /* Call cleanup functions and destroy the thread-specific data */ - __pthread_perform_cleanup(); - __pthread_destroy_specifics(); - /* Store return value */ - __pthread_lock(THREAD_GETMEM(self, p_lock), self); - THREAD_SETMEM(self, p_retval, retval); - /* See whether we have to signal the death. */ - if (THREAD_GETMEM(self, p_report_events)) - { - /* See whether TD_DEATH is in any of the mask. */ - int idx = __td_eventword (TD_DEATH); - uint32_t mask = __td_eventmask (TD_DEATH); - - if ((mask & (__pthread_threads_events.event_bits[idx] - | THREAD_GETMEM_NC(self, - p_eventbuf.eventmask).event_bits[idx])) - != 0) - { - /* Yep, we have to signal the death. */ - THREAD_SETMEM(self, p_eventbuf.eventnum, TD_DEATH); - THREAD_SETMEM(self, p_eventbuf.eventdata, self); - __pthread_last_event = self; - - /* Now call the function to signal the event. */ - __linuxthreads_death_event(); - } - } - /* Say that we've terminated */ - THREAD_SETMEM(self, p_terminated, 1); - /* See if someone is joining on us */ - joining = THREAD_GETMEM(self, p_joining); - PDEBUG("joining = %p, pid=%d\n", joining, joining->p_pid); - __pthread_unlock(THREAD_GETMEM(self, p_lock)); - /* Restart joining thread if any */ - if (joining != NULL) restart(joining); - /* If this is the initial thread, block until all threads have terminated. - If another thread calls exit, we'll be terminated from our signal - handler. */ - if (self == __pthread_main_thread && __pthread_manager_request >= 0) { - request.req_thread = self; - request.req_kind = REQ_MAIN_THREAD_EXIT; - TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request, - (char *)&request, sizeof(request))); - suspend(self); - /* Main thread flushes stdio streams and runs atexit functions. - * It also calls a handler within LinuxThreads which sends a process exit - * request to the thread manager. */ - exit(0); - } - /* Exit the process (but don't flush stdio streams, and don't run - atexit functions). */ - _exit(0); -} - -/* Function called by pthread_cancel to remove the thread from - waiting on a condition variable queue. */ - -static int join_extricate_func(void *obj, pthread_descr th) -{ - volatile pthread_descr self = thread_self(); - pthread_handle handle = obj; - pthread_descr jo; - int did_remove = 0; - - __pthread_lock(&handle->h_lock, self); - jo = handle->h_descr; - did_remove = jo->p_joining != NULL; - jo->p_joining = NULL; - __pthread_unlock(&handle->h_lock); - - return did_remove; -} - -int pthread_join(pthread_t thread_id, void ** thread_return) -{ - volatile pthread_descr self = thread_self(); - struct pthread_request request; - pthread_handle handle = thread_handle(thread_id); - pthread_descr th; - pthread_extricate_if extr; - int already_canceled = 0; - PDEBUG("\n"); - - /* Set up extrication interface */ - extr.pu_object = handle; - extr.pu_extricate_func = join_extricate_func; - - __pthread_lock(&handle->h_lock, self); - if (invalid_handle(handle, thread_id)) { - __pthread_unlock(&handle->h_lock); - return ESRCH; - } - th = handle->h_descr; - if (th == self) { - __pthread_unlock(&handle->h_lock); - return EDEADLK; - } - /* If detached or already joined, error */ - if (th->p_detached || th->p_joining != NULL) { - __pthread_unlock(&handle->h_lock); - return EINVAL; - } - /* If not terminated yet, suspend ourselves. */ - if (! th->p_terminated) { - /* Register extrication interface */ - __pthread_set_own_extricate_if(self, &extr); - if (!(THREAD_GETMEM(self, p_canceled) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE)) - th->p_joining = self; - else - already_canceled = 1; - __pthread_unlock(&handle->h_lock); - - if (already_canceled) { - __pthread_set_own_extricate_if(self, 0); - pthread_exit(PTHREAD_CANCELED); - } - - PDEBUG("before suspend\n"); - suspend(self); - PDEBUG("after suspend\n"); - /* Deregister extrication interface */ - __pthread_set_own_extricate_if(self, 0); - - /* This is a cancellation point */ - if (THREAD_GETMEM(self, p_woken_by_cancel) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) { - THREAD_SETMEM(self, p_woken_by_cancel, 0); - pthread_exit(PTHREAD_CANCELED); - } - __pthread_lock(&handle->h_lock, self); - } - /* Get return value */ - if (thread_return != NULL) *thread_return = th->p_retval; - __pthread_unlock(&handle->h_lock); - /* Send notification to thread manager */ - if (__pthread_manager_request >= 0) { - request.req_thread = self; - request.req_kind = REQ_FREE; - request.req_args.free.thread_id = thread_id; - TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request, - (char *) &request, sizeof(request))); - } - return 0; -} - -int pthread_detach(pthread_t thread_id) -{ - int terminated; - struct pthread_request request; - pthread_handle handle = thread_handle(thread_id); - pthread_descr th; - - __pthread_lock(&handle->h_lock, NULL); - if (invalid_handle(handle, thread_id)) { - __pthread_unlock(&handle->h_lock); - return ESRCH; - } - th = handle->h_descr; - /* If already detached, error */ - if (th->p_detached) { - __pthread_unlock(&handle->h_lock); - return EINVAL; - } - /* If already joining, don't do anything. */ - if (th->p_joining != NULL) { - __pthread_unlock(&handle->h_lock); - return 0; - } - /* Mark as detached */ - th->p_detached = 1; - terminated = th->p_terminated; - __pthread_unlock(&handle->h_lock); - /* If already terminated, notify thread manager to reclaim resources */ - if (terminated && __pthread_manager_request >= 0) { - request.req_thread = thread_self(); - request.req_kind = REQ_FREE; - request.req_args.free.thread_id = thread_id; - TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request, - (char *) &request, sizeof(request))); - } - return 0; -} diff --git a/libpthread/linuxthreads/linuxthreads.texi b/libpthread/linuxthreads/linuxthreads.texi deleted file mode 100644 index 795fb7097..000000000 --- a/libpthread/linuxthreads/linuxthreads.texi +++ /dev/null @@ -1,1627 +0,0 @@ -@node POSIX Threads -@c @node POSIX Threads, , Top, Top -@chapter POSIX Threads -@c %MENU% The standard threads library - -@c This chapter needs more work bigtime. -zw - -This chapter describes the pthreads (POSIX threads) library. This -library provides support functions for multithreaded programs: thread -primitives, synchronization objects, and so forth. It also implements -POSIX 1003.1b semaphores (not to be confused with System V semaphores). - -The threads operations (@samp{pthread_*}) do not use @var{errno}. -Instead they return an error code directly. The semaphore operations do -use @var{errno}. - -@menu -* Basic Thread Operations:: Creating, terminating, and waiting for threads. -* Thread Attributes:: Tuning thread scheduling. -* Cancellation:: Stopping a thread before it's done. -* Cleanup Handlers:: Deallocating resources when a thread is - canceled. -* Mutexes:: One way to synchronize threads. -* Condition Variables:: Another way. -* POSIX Semaphores:: And a third way. -* Thread-Specific Data:: Variables with different values in - different threads. -* Threads and Signal Handling:: Why you should avoid mixing the two, and - how to do it if you must. -* Threads and Fork:: Interactions between threads and the - @code{fork} function. -* Streams and Fork:: Interactions between stdio streams and - @code{fork}. -* Miscellaneous Thread Functions:: A grab bag of utility routines. -@end menu - -@node Basic Thread Operations -@section Basic Thread Operations - -These functions are the thread equivalents of @code{fork}, @code{exit}, -and @code{wait}. - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_create (pthread_t * @var{thread}, pthread_attr_t * @var{attr}, void * (*@var{start_routine})(void *), void * @var{arg}) -@code{pthread_create} creates a new thread of control that executes -concurrently with the calling thread. The new thread calls the -function @var{start_routine}, passing it @var{arg} as first argument. The -new thread terminates either explicitly, by calling @code{pthread_exit}, -or implicitly, by returning from the @var{start_routine} function. The -latter case is equivalent to calling @code{pthread_exit} with the result -returned by @var{start_routine} as exit code. - -The @var{attr} argument specifies thread attributes to be applied to the -new thread. @xref{Thread Attributes}, for details. The @var{attr} -argument can also be @code{NULL}, in which case default attributes are -used: the created thread is joinable (not detached) and has an ordinary -(not realtime) scheduling policy. - -On success, the identifier of the newly created thread is stored in the -location pointed by the @var{thread} argument, and a 0 is returned. On -error, a non-zero error code is returned. - -This function may return the following errors: -@table @code -@item EAGAIN -Not enough system resources to create a process for the new thread, -or more than @code{PTHREAD_THREADS_MAX} threads are already active. -@end table -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun void pthread_exit (void *@var{retval}) -@code{pthread_exit} terminates the execution of the calling thread. All -cleanup handlers (@pxref{Cleanup Handlers}) that have been set for the -calling thread with @code{pthread_cleanup_push} are executed in reverse -order (the most recently pushed handler is executed first). Finalization -functions for thread-specific data are then called for all keys that -have non-@code{NULL} values associated with them in the calling thread -(@pxref{Thread-Specific Data}). Finally, execution of the calling -thread is stopped. - -The @var{retval} argument is the return value of the thread. It can be -retrieved from another thread using @code{pthread_join}. - -The @code{pthread_exit} function never returns. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_cancel (pthread_t @var{thread}) - -@code{pthread_cancel} sends a cancellation request to the thread denoted -by the @var{thread} argument. If there is no such thread, -@code{pthread_cancel} fails and returns @code{ESRCH}. Otherwise it -returns 0. @xref{Cancellation}, for details. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_join (pthread_t @var{th}, void **thread_@var{return}) -@code{pthread_join} suspends the execution of the calling thread until -the thread identified by @var{th} terminates, either by calling -@code{pthread_exit} or by being canceled. - -If @var{thread_return} is not @code{NULL}, the return value of @var{th} -is stored in the location pointed to by @var{thread_return}. The return -value of @var{th} is either the argument it gave to @code{pthread_exit}, -or @code{PTHREAD_CANCELED} if @var{th} was canceled. - -The joined thread @code{th} must be in the joinable state: it must not -have been detached using @code{pthread_detach} or the -@code{PTHREAD_CREATE_DETACHED} attribute to @code{pthread_create}. - -When a joinable thread terminates, its memory resources (thread -descriptor and stack) are not deallocated until another thread performs -@code{pthread_join} on it. Therefore, @code{pthread_join} must be called -once for each joinable thread created to avoid memory leaks. - -At most one thread can wait for the termination of a given -thread. Calling @code{pthread_join} on a thread @var{th} on which -another thread is already waiting for termination returns an error. - -@code{pthread_join} is a cancellation point. If a thread is canceled -while suspended in @code{pthread_join}, the thread execution resumes -immediately and the cancellation is executed without waiting for the -@var{th} thread to terminate. If cancellation occurs during -@code{pthread_join}, the @var{th} thread remains not joined. - -On success, the return value of @var{th} is stored in the location -pointed to by @var{thread_return}, and 0 is returned. On error, one of -the following values is returned: -@table @code -@item ESRCH -No thread could be found corresponding to that specified by @var{th}. -@item EINVAL -The @var{th} thread has been detached, or another thread is already -waiting on termination of @var{th}. -@item EDEADLK -The @var{th} argument refers to the calling thread. -@end table -@end deftypefun - -@node Thread Attributes -@section Thread Attributes - -@comment pthread.h -@comment POSIX - -Threads have a number of attributes that may be set at creation time. -This is done by filling a thread attribute object @var{attr} of type -@code{pthread_attr_t}, then passing it as second argument to -@code{pthread_create}. Passing @code{NULL} is equivalent to passing a -thread attribute object with all attributes set to their default values. - -Attribute objects are consulted only when creating a new thread. The -same attribute object can be used for creating several threads. -Modifying an attribute object after a call to @code{pthread_create} does -not change the attributes of the thread previously created. - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_attr_init (pthread_attr_t *@var{attr}) -@code{pthread_attr_init} initializes the thread attribute object -@var{attr} and fills it with default values for the attributes. (The -default values are listed below for each attribute.) - -Each attribute @var{attrname} (see below for a list of all attributes) -can be individually set using the function -@code{pthread_attr_set@var{attrname}} and retrieved using the function -@code{pthread_attr_get@var{attrname}}. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_attr_destroy (pthread_attr_t *@var{attr}) -@code{pthread_attr_destroy} destroys the attribute object pointed to by -@var{attr} releasing any resources associated with it. @var{attr} is -left in an undefined state, and you must not use it again in a call to -any pthreads function until it has been reinitialized. -@end deftypefun - -@findex pthread_attr_setdetachstate -@findex pthread_attr_setguardsize -@findex pthread_attr_setinheritsched -@findex pthread_attr_setschedparam -@findex pthread_attr_setschedpolicy -@findex pthread_attr_setscope -@findex pthread_attr_setstack -@findex pthread_attr_setstackaddr -@findex pthread_attr_setstacksize -@comment pthread.h -@comment POSIX -@deftypefun int pthread_attr_setattr (pthread_attr_t *@var{obj}, int @var{value}) -Set attribute @var{attr} to @var{value} in the attribute object pointed -to by @var{obj}. See below for a list of possible attributes and the -values they can take. - -On success, these functions return 0. If @var{value} is not meaningful -for the @var{attr} being modified, they will return the error code -@code{EINVAL}. Some of the functions have other failure modes; see -below. -@end deftypefun - -@findex pthread_attr_getdetachstate -@findex pthread_attr_getguardsize -@findex pthread_attr_getinheritsched -@findex pthread_attr_getschedparam -@findex pthread_attr_getschedpolicy -@findex pthread_attr_getscope -@findex pthread_attr_getstack -@findex pthread_attr_getstackaddr -@findex pthread_attr_getstacksize -@comment pthread.h -@comment POSIX -@deftypefun int pthread_attr_getattr (const pthread_attr_t *@var{obj}, int *@var{value}) -Store the current setting of @var{attr} in @var{obj} into the variable -pointed to by @var{value}. - -These functions always return 0. -@end deftypefun - -The following thread attributes are supported: -@table @samp -@item detachstate -Choose whether the thread is created in the joinable state (value -@code{PTHREAD_CREATE_JOINABLE}) or in the detached state -(@code{PTHREAD_CREATE_DETACHED}). The default is -@code{PTHREAD_CREATE_JOINABLE}. - -In the joinable state, another thread can synchronize on the thread -termination and recover its termination code using @code{pthread_join}, -but some of the thread resources are kept allocated after the thread -terminates, and reclaimed only when another thread performs -@code{pthread_join} on that thread. - -In the detached state, the thread resources are immediately freed when -it terminates, but @code{pthread_join} cannot be used to synchronize on -the thread termination. - -A thread created in the joinable state can later be put in the detached -thread using @code{pthread_detach}. - -@item schedpolicy -Select the scheduling policy for the thread: one of @code{SCHED_OTHER} -(regular, non-realtime scheduling), @code{SCHED_RR} (realtime, -round-robin) or @code{SCHED_FIFO} (realtime, first-in first-out). -The default is @code{SCHED_OTHER}. -@c Not doc'd in our manual: FIXME. -@c See @code{sched_setpolicy} for more information on scheduling policies. - -The realtime scheduling policies @code{SCHED_RR} and @code{SCHED_FIFO} -are available only to processes with superuser privileges. -@code{pthread_attr_setschedparam} will fail and return @code{ENOTSUP} if -you try to set a realtime policy when you are unprivileged. - -The scheduling policy of a thread can be changed after creation with -@code{pthread_setschedparam}. - -@item schedparam -Change the scheduling parameter (the scheduling priority) -for the thread. The default is 0. - -This attribute is not significant if the scheduling policy is -@code{SCHED_OTHER}; it only matters for the realtime policies -@code{SCHED_RR} and @code{SCHED_FIFO}. - -The scheduling priority of a thread can be changed after creation with -@code{pthread_setschedparam}. - -@item inheritsched -Choose whether the scheduling policy and scheduling parameter for the -newly created thread are determined by the values of the -@var{schedpolicy} and @var{schedparam} attributes (value -@code{PTHREAD_EXPLICIT_SCHED}) or are inherited from the parent thread -(value @code{PTHREAD_INHERIT_SCHED}). The default is -@code{PTHREAD_EXPLICIT_SCHED}. - -@item scope -Choose the scheduling contention scope for the created thread. The -default is @code{PTHREAD_SCOPE_SYSTEM}, meaning that the threads contend -for CPU time with all processes running on the machine. In particular, -thread priorities are interpreted relative to the priorities of all -other processes on the machine. The other possibility, -@code{PTHREAD_SCOPE_PROCESS}, means that scheduling contention occurs -only between the threads of the running process: thread priorities are -interpreted relative to the priorities of the other threads of the -process, regardless of the priorities of other processes. - -@code{PTHREAD_SCOPE_PROCESS} is not supported in LinuxThreads. If you -try to set the scope to this value, @code{pthread_attr_setscope} will -fail and return @code{ENOTSUP}. - -@item stackaddr -Provide an address for an application managed stack. The size of the -stack must be at least @code{PTHREAD_STACK_MIN}. - -@item stacksize -Change the size of the stack created for the thread. The value defines -the minimum stack size, in bytes. - -If the value exceeds the system's maximum stack size, or is smaller -than @code{PTHREAD_STACK_MIN}, @code{pthread_attr_setstacksize} will -fail and return @code{EINVAL}. - -@item stack -Provide both the address and size of an application managed stack to -use for the new thread. The base of the memory area is @var{stackaddr} -with the size of the memory area, @var{stacksize}, measured in bytes. - -If the value of @var{stacksize} is less than @code{PTHREAD_STACK_MIN}, -or greater than the system's maximum stack size, or if the value of -@var{stackaddr} lacks the proper alignment, @code{pthread_attr_setstack} -will fail and return @code{EINVAL}. - -@item guardsize -Change the minimum size in bytes of the guard area for the thread's -stack. The default size is a single page. If this value is set, it -will be rounded up to the nearest page size. If the value is set to 0, -a guard area will not be created for this thread. The space allocated -for the guard area is used to catch stack overflow. Therefore, when -allocating large structures on the stack, a larger guard area may be -required to catch a stack overflow. - -If the caller is managing their own stacks (if the @code{stackaddr} -attribute has been set), then the @code{guardsize} attribute is ignored. - -If the value exceeds the @code{stacksize}, @code{pthread_atrr_setguardsize} -will fail and return @code{EINVAL}. -@end table - -@node Cancellation -@section Cancellation - -Cancellation is the mechanism by which a thread can terminate the -execution of another thread. More precisely, a thread can send a -cancellation request to another thread. Depending on its settings, the -target thread can then either ignore the request, honor it immediately, -or defer it till it reaches a cancellation point. When threads are -first created by @code{pthread_create}, they always defer cancellation -requests. - -When a thread eventually honors a cancellation request, it behaves as if -@code{pthread_exit(PTHREAD_CANCELED)} was called. All cleanup handlers -are executed in reverse order, finalization functions for -thread-specific data are called, and finally the thread stops executing. -If the canceled thread was joinable, the return value -@code{PTHREAD_CANCELED} is provided to whichever thread calls -@var{pthread_join} on it. See @code{pthread_exit} for more information. - -Cancellation points are the points where the thread checks for pending -cancellation requests and performs them. The POSIX threads functions -@code{pthread_join}, @code{pthread_cond_wait}, -@code{pthread_cond_timedwait}, @code{pthread_testcancel}, -@code{sem_wait}, and @code{sigwait} are cancellation points. In -addition, these system calls are cancellation points: - -@multitable @columnfractions .33 .33 .33 -@item @t{accept} @tab @t{open} @tab @t{sendmsg} -@item @t{close} @tab @t{pause} @tab @t{sendto} -@item @t{connect} @tab @t{read} @tab @t{system} -@item @t{fcntl} @tab @t{recv} @tab @t{tcdrain} -@item @t{fsync} @tab @t{recvfrom} @tab @t{wait} -@item @t{lseek} @tab @t{recvmsg} @tab @t{waitpid} -@item @t{msync} @tab @t{send} @tab @t{write} -@item @t{nanosleep} -@end multitable - -@noindent -All library functions that call these functions (such as -@code{printf}) are also cancellation points. - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_setcancelstate (int @var{state}, int *@var{oldstate}) -@code{pthread_setcancelstate} changes the cancellation state for the -calling thread -- that is, whether cancellation requests are ignored or -not. The @var{state} argument is the new cancellation state: either -@code{PTHREAD_CANCEL_ENABLE} to enable cancellation, or -@code{PTHREAD_CANCEL_DISABLE} to disable cancellation (cancellation -requests are ignored). - -If @var{oldstate} is not @code{NULL}, the previous cancellation state is -stored in the location pointed to by @var{oldstate}, and can thus be -restored later by another call to @code{pthread_setcancelstate}. - -If the @var{state} argument is not @code{PTHREAD_CANCEL_ENABLE} or -@code{PTHREAD_CANCEL_DISABLE}, @code{pthread_setcancelstate} fails and -returns @code{EINVAL}. Otherwise it returns 0. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_setcanceltype (int @var{type}, int *@var{oldtype}) -@code{pthread_setcanceltype} changes the type of responses to -cancellation requests for the calling thread: asynchronous (immediate) -or deferred. The @var{type} argument is the new cancellation type: -either @code{PTHREAD_CANCEL_ASYNCHRONOUS} to cancel the calling thread -as soon as the cancellation request is received, or -@code{PTHREAD_CANCEL_DEFERRED} to keep the cancellation request pending -until the next cancellation point. If @var{oldtype} is not @code{NULL}, -the previous cancellation state is stored in the location pointed to by -@var{oldtype}, and can thus be restored later by another call to -@code{pthread_setcanceltype}. - -If the @var{type} argument is not @code{PTHREAD_CANCEL_DEFERRED} or -@code{PTHREAD_CANCEL_ASYNCHRONOUS}, @code{pthread_setcanceltype} fails -and returns @code{EINVAL}. Otherwise it returns 0. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun void pthread_testcancel (@var{void}) -@code{pthread_testcancel} does nothing except testing for pending -cancellation and executing it. Its purpose is to introduce explicit -checks for cancellation in long sequences of code that do not call -cancellation point functions otherwise. -@end deftypefun - -@node Cleanup Handlers -@section Cleanup Handlers - -Cleanup handlers are functions that get called when a thread terminates, -either by calling @code{pthread_exit} or because of -cancellation. Cleanup handlers are installed and removed following a -stack-like discipline. - -The purpose of cleanup handlers is to free the resources that a thread -may hold at the time it terminates. In particular, if a thread exits or -is canceled while it owns a locked mutex, the mutex will remain locked -forever and prevent other threads from executing normally. The best way -to avoid this is, just before locking the mutex, to install a cleanup -handler whose effect is to unlock the mutex. Cleanup handlers can be -used similarly to free blocks allocated with @code{malloc} or close file -descriptors on thread termination. - -Here is how to lock a mutex @var{mut} in such a way that it will be -unlocked if the thread is canceled while @var{mut} is locked: - -@smallexample -pthread_cleanup_push(pthread_mutex_unlock, (void *) &mut); -pthread_mutex_lock(&mut); -/* do some work */ -pthread_mutex_unlock(&mut); -pthread_cleanup_pop(0); -@end smallexample - -Equivalently, the last two lines can be replaced by - -@smallexample -pthread_cleanup_pop(1); -@end smallexample - -Notice that the code above is safe only in deferred cancellation mode -(see @code{pthread_setcanceltype}). In asynchronous cancellation mode, a -cancellation can occur between @code{pthread_cleanup_push} and -@code{pthread_mutex_lock}, or between @code{pthread_mutex_unlock} and -@code{pthread_cleanup_pop}, resulting in both cases in the thread trying -to unlock a mutex not locked by the current thread. This is the main -reason why asynchronous cancellation is difficult to use. - -If the code above must also work in asynchronous cancellation mode, -then it must switch to deferred mode for locking and unlocking the -mutex: - -@smallexample -pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, &oldtype); -pthread_cleanup_push(pthread_mutex_unlock, (void *) &mut); -pthread_mutex_lock(&mut); -/* do some work */ -pthread_cleanup_pop(1); -pthread_setcanceltype(oldtype, NULL); -@end smallexample - -The code above can be rewritten in a more compact and efficient way, -using the non-portable functions @code{pthread_cleanup_push_defer_np} -and @code{pthread_cleanup_pop_restore_np}: - -@smallexample -pthread_cleanup_push_defer_np(pthread_mutex_unlock, (void *) &mut); -pthread_mutex_lock(&mut); -/* do some work */ -pthread_cleanup_pop_restore_np(1); -@end smallexample - -@comment pthread.h -@comment POSIX -@deftypefun void pthread_cleanup_push (void (*@var{routine}) (void *), void *@var{arg}) - -@code{pthread_cleanup_push} installs the @var{routine} function with -argument @var{arg} as a cleanup handler. From this point on to the -matching @code{pthread_cleanup_pop}, the function @var{routine} will be -called with arguments @var{arg} when the thread terminates, either -through @code{pthread_exit} or by cancellation. If several cleanup -handlers are active at that point, they are called in LIFO order: the -most recently installed handler is called first. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun void pthread_cleanup_pop (int @var{execute}) -@code{pthread_cleanup_pop} removes the most recently installed cleanup -handler. If the @var{execute} argument is not 0, it also executes the -handler, by calling the @var{routine} function with arguments -@var{arg}. If the @var{execute} argument is 0, the handler is only -removed but not executed. -@end deftypefun - -Matching pairs of @code{pthread_cleanup_push} and -@code{pthread_cleanup_pop} must occur in the same function, at the same -level of block nesting. Actually, @code{pthread_cleanup_push} and -@code{pthread_cleanup_pop} are macros, and the expansion of -@code{pthread_cleanup_push} introduces an open brace @code{@{} with the -matching closing brace @code{@}} being introduced by the expansion of the -matching @code{pthread_cleanup_pop}. - -@comment pthread.h -@comment GNU -@deftypefun void pthread_cleanup_push_defer_np (void (*@var{routine}) (void *), void *@var{arg}) -@code{pthread_cleanup_push_defer_np} is a non-portable extension that -combines @code{pthread_cleanup_push} and @code{pthread_setcanceltype}. -It pushes a cleanup handler just as @code{pthread_cleanup_push} does, -but also saves the current cancellation type and sets it to deferred -cancellation. This ensures that the cleanup mechanism is effective even -if the thread was initially in asynchronous cancellation mode. -@end deftypefun - -@comment pthread.h -@comment GNU -@deftypefun void pthread_cleanup_pop_restore_np (int @var{execute}) -@code{pthread_cleanup_pop_restore_np} pops a cleanup handler introduced -by @code{pthread_cleanup_push_defer_np}, and restores the cancellation -type to its value at the time @code{pthread_cleanup_push_defer_np} was -called. -@end deftypefun - -@code{pthread_cleanup_push_defer_np} and -@code{pthread_cleanup_pop_restore_np} must occur in matching pairs, at -the same level of block nesting. - -The sequence - -@smallexample -pthread_cleanup_push_defer_np(routine, arg); -... -pthread_cleanup_pop_restore_np(execute); -@end smallexample - -@noindent -is functionally equivalent to (but more compact and efficient than) - -@smallexample -@{ - int oldtype; - pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, &oldtype); - pthread_cleanup_push(routine, arg); - ... - pthread_cleanup_pop(execute); - pthread_setcanceltype(oldtype, NULL); -@} -@end smallexample - - -@node Mutexes -@section Mutexes - -A mutex is a MUTual EXclusion device, and is useful for protecting -shared data structures from concurrent modifications, and implementing -critical sections and monitors. - -A mutex has two possible states: unlocked (not owned by any thread), -and locked (owned by one thread). A mutex can never be owned by two -different threads simultaneously. A thread attempting to lock a mutex -that is already locked by another thread is suspended until the owning -thread unlocks the mutex first. - -None of the mutex functions is a cancellation point, not even -@code{pthread_mutex_lock}, in spite of the fact that it can suspend a -thread for arbitrary durations. This way, the status of mutexes at -cancellation points is predictable, allowing cancellation handlers to -unlock precisely those mutexes that need to be unlocked before the -thread stops executing. Consequently, threads using deferred -cancellation should never hold a mutex for extended periods of time. - -It is not safe to call mutex functions from a signal handler. In -particular, calling @code{pthread_mutex_lock} or -@code{pthread_mutex_unlock} from a signal handler may deadlock the -calling thread. - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_mutex_init (pthread_mutex_t *@var{mutex}, const pthread_mutexattr_t *@var{mutexattr}) - -@code{pthread_mutex_init} initializes the mutex object pointed to by -@var{mutex} according to the mutex attributes specified in @var{mutexattr}. -If @var{mutexattr} is @code{NULL}, default attributes are used instead. - -The LinuxThreads implementation supports only one mutex attribute, -the @var{mutex type}, which is either ``fast'', ``recursive'', or -``error checking''. The type of a mutex determines whether -it can be locked again by a thread that already owns it. -The default type is ``fast''. - -Variables of type @code{pthread_mutex_t} can also be initialized -statically, using the constants @code{PTHREAD_MUTEX_INITIALIZER} (for -timed mutexes), @code{PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP} (for -recursive mutexes), @code{PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP} -(for fast mutexes(, and @code{PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP} -(for error checking mutexes). - -@code{pthread_mutex_init} always returns 0. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_mutex_lock (pthread_mutex_t *mutex)) -@code{pthread_mutex_lock} locks the given mutex. If the mutex is -currently unlocked, it becomes locked and owned by the calling thread, -and @code{pthread_mutex_lock} returns immediately. If the mutex is -already locked by another thread, @code{pthread_mutex_lock} suspends the -calling thread until the mutex is unlocked. - -If the mutex is already locked by the calling thread, the behavior of -@code{pthread_mutex_lock} depends on the type of the mutex. If the mutex -is of the ``fast'' type, the calling thread is suspended. It will -remain suspended forever, because no other thread can unlock the mutex. -If the mutex is of the ``error checking'' type, @code{pthread_mutex_lock} -returns immediately with the error code @code{EDEADLK}. If the mutex is -of the ``recursive'' type, @code{pthread_mutex_lock} succeeds and -returns immediately, recording the number of times the calling thread -has locked the mutex. An equal number of @code{pthread_mutex_unlock} -operations must be performed before the mutex returns to the unlocked -state. -@c This doesn't discuss PTHREAD_MUTEX_TIMED_NP mutex attributes. FIXME -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_mutex_trylock (pthread_mutex_t *@var{mutex}) -@code{pthread_mutex_trylock} behaves identically to -@code{pthread_mutex_lock}, except that it does not block the calling -thread if the mutex is already locked by another thread (or by the -calling thread in the case of a ``fast'' mutex). Instead, -@code{pthread_mutex_trylock} returns immediately with the error code -@code{EBUSY}. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_mutex_timedlock (pthread_mutex_t *@var{mutex}, const struct timespec *@var{abstime}) -The @code{pthread_mutex_timedlock} is similar to the -@code{pthread_mutex_lock} function but instead of blocking for in -indefinite time if the mutex is locked by another thread, it returns -when the time specified in @var{abstime} is reached. - -This function can only be used on standard (``timed'') and ``error -checking'' mutexes. It behaves just like @code{pthread_mutex_lock} for -all other types. - -If the mutex is successfully locked, the function returns zero. If the -time specified in @var{abstime} is reached without the mutex being locked, -@code{ETIMEDOUT} is returned. - -This function was introduced in the POSIX.1d revision of the POSIX standard. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_mutex_unlock (pthread_mutex_t *@var{mutex}) -@code{pthread_mutex_unlock} unlocks the given mutex. The mutex is -assumed to be locked and owned by the calling thread on entrance to -@code{pthread_mutex_unlock}. If the mutex is of the ``fast'' type, -@code{pthread_mutex_unlock} always returns it to the unlocked state. If -it is of the ``recursive'' type, it decrements the locking count of the -mutex (number of @code{pthread_mutex_lock} operations performed on it by -the calling thread), and only when this count reaches zero is the mutex -actually unlocked. - -On ``error checking'' mutexes, @code{pthread_mutex_unlock} actually -checks at run-time that the mutex is locked on entrance, and that it was -locked by the same thread that is now calling -@code{pthread_mutex_unlock}. If these conditions are not met, -@code{pthread_mutex_unlock} returns @code{EPERM}, and the mutex remains -unchanged. ``Fast'' and ``recursive'' mutexes perform no such checks, -thus allowing a locked mutex to be unlocked by a thread other than its -owner. This is non-portable behavior and must not be relied upon. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_mutex_destroy (pthread_mutex_t *@var{mutex}) -@code{pthread_mutex_destroy} destroys a mutex object, freeing the -resources it might hold. The mutex must be unlocked on entrance. In the -LinuxThreads implementation, no resources are associated with mutex -objects, thus @code{pthread_mutex_destroy} actually does nothing except -checking that the mutex is unlocked. - -If the mutex is locked by some thread, @code{pthread_mutex_destroy} -returns @code{EBUSY}. Otherwise it returns 0. -@end deftypefun - -If any of the above functions (except @code{pthread_mutex_init}) -is applied to an uninitialized mutex, they will simply return -@code{EINVAL} and do nothing. - -A shared global variable @var{x} can be protected by a mutex as follows: - -@smallexample -int x; -pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER; -@end smallexample - -All accesses and modifications to @var{x} should be bracketed by calls to -@code{pthread_mutex_lock} and @code{pthread_mutex_unlock} as follows: - -@smallexample -pthread_mutex_lock(&mut); -/* operate on x */ -pthread_mutex_unlock(&mut); -@end smallexample - -Mutex attributes can be specified at mutex creation time, by passing a -mutex attribute object as second argument to @code{pthread_mutex_init}. -Passing @code{NULL} is equivalent to passing a mutex attribute object -with all attributes set to their default values. - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_mutexattr_init (pthread_mutexattr_t *@var{attr}) -@code{pthread_mutexattr_init} initializes the mutex attribute object -@var{attr} and fills it with default values for the attributes. - -This function always returns 0. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_mutexattr_destroy (pthread_mutexattr_t *@var{attr}) -@code{pthread_mutexattr_destroy} destroys a mutex attribute object, -which must not be reused until it is -reinitialized. @code{pthread_mutexattr_destroy} does nothing in the -LinuxThreads implementation. - -This function always returns 0. -@end deftypefun - -LinuxThreads supports only one mutex attribute: the mutex type, which is -either @code{PTHREAD_MUTEX_ADAPTIVE_NP} for ``fast'' mutexes, -@code{PTHREAD_MUTEX_RECURSIVE_NP} for ``recursive'' mutexes, -@code{PTHREAD_MUTEX_TIMED_NP} for ``timed'' mutexes, or -@code{PTHREAD_MUTEX_ERRORCHECK_NP} for ``error checking'' mutexes. As -the @code{NP} suffix indicates, this is a non-portable extension to the -POSIX standard and should not be employed in portable programs. - -The mutex type determines what happens if a thread attempts to lock a -mutex it already owns with @code{pthread_mutex_lock}. If the mutex is of -the ``fast'' type, @code{pthread_mutex_lock} simply suspends the calling -thread forever. If the mutex is of the ``error checking'' type, -@code{pthread_mutex_lock} returns immediately with the error code -@code{EDEADLK}. If the mutex is of the ``recursive'' type, the call to -@code{pthread_mutex_lock} returns immediately with a success return -code. The number of times the thread owning the mutex has locked it is -recorded in the mutex. The owning thread must call -@code{pthread_mutex_unlock} the same number of times before the mutex -returns to the unlocked state. - -The default mutex type is ``timed'', that is, @code{PTHREAD_MUTEX_TIMED_NP}. -@c This doesn't describe how a ``timed'' mutex behaves. FIXME - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_mutexattr_settype (pthread_mutexattr_t *@var{attr}, int @var{type}) -@code{pthread_mutexattr_settype} sets the mutex type attribute in -@var{attr} to the value specified by @var{type}. - -If @var{type} is not @code{PTHREAD_MUTEX_ADAPTIVE_NP}, -@code{PTHREAD_MUTEX_RECURSIVE_NP}, @code{PTHREAD_MUTEX_TIMED_NP}, or -@code{PTHREAD_MUTEX_ERRORCHECK_NP}, this function will return -@code{EINVAL} and leave @var{attr} unchanged. - -The standard Unix98 identifiers @code{PTHREAD_MUTEX_DEFAULT}, -@code{PTHREAD_MUTEX_NORMAL}, @code{PTHREAD_MUTEX_RECURSIVE}, -and @code{PTHREAD_MUTEX_ERRORCHECK} are also permitted. - -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_mutexattr_gettype (const pthread_mutexattr_t *@var{attr}, int *@var{type}) -@code{pthread_mutexattr_gettype} retrieves the current value of the -mutex type attribute in @var{attr} and stores it in the location pointed -to by @var{type}. - -This function always returns 0. -@end deftypefun - -@node Condition Variables -@section Condition Variables - -A condition (short for ``condition variable'') is a synchronization -device that allows threads to suspend execution until some predicate on -shared data is satisfied. The basic operations on conditions are: signal -the condition (when the predicate becomes true), and wait for the -condition, suspending the thread execution until another thread signals -the condition. - -A condition variable must always be associated with a mutex, to avoid -the race condition where a thread prepares to wait on a condition -variable and another thread signals the condition just before the first -thread actually waits on it. - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_cond_init (pthread_cond_t *@var{cond}, pthread_condattr_t *cond_@var{attr}) - -@code{pthread_cond_init} initializes the condition variable @var{cond}, -using the condition attributes specified in @var{cond_attr}, or default -attributes if @var{cond_attr} is @code{NULL}. The LinuxThreads -implementation supports no attributes for conditions, hence the -@var{cond_attr} parameter is actually ignored. - -Variables of type @code{pthread_cond_t} can also be initialized -statically, using the constant @code{PTHREAD_COND_INITIALIZER}. - -This function always returns 0. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_cond_signal (pthread_cond_t *@var{cond}) -@code{pthread_cond_signal} restarts one of the threads that are waiting -on the condition variable @var{cond}. If no threads are waiting on -@var{cond}, nothing happens. If several threads are waiting on -@var{cond}, exactly one is restarted, but it is not specified which. - -This function always returns 0. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_cond_broadcast (pthread_cond_t *@var{cond}) -@code{pthread_cond_broadcast} restarts all the threads that are waiting -on the condition variable @var{cond}. Nothing happens if no threads are -waiting on @var{cond}. - -This function always returns 0. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_cond_wait (pthread_cond_t *@var{cond}, pthread_mutex_t *@var{mutex}) -@code{pthread_cond_wait} atomically unlocks the @var{mutex} (as per -@code{pthread_unlock_mutex}) and waits for the condition variable -@var{cond} to be signaled. The thread execution is suspended and does -not consume any CPU time until the condition variable is signaled. The -@var{mutex} must be locked by the calling thread on entrance to -@code{pthread_cond_wait}. Before returning to the calling thread, -@code{pthread_cond_wait} re-acquires @var{mutex} (as per -@code{pthread_lock_mutex}). - -Unlocking the mutex and suspending on the condition variable is done -atomically. Thus, if all threads always acquire the mutex before -signaling the condition, this guarantees that the condition cannot be -signaled (and thus ignored) between the time a thread locks the mutex -and the time it waits on the condition variable. - -This function always returns 0. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_cond_timedwait (pthread_cond_t *@var{cond}, pthread_mutex_t *@var{mutex}, const struct timespec *@var{abstime}) -@code{pthread_cond_timedwait} atomically unlocks @var{mutex} and waits -on @var{cond}, as @code{pthread_cond_wait} does, but it also bounds the -duration of the wait. If @var{cond} has not been signaled before time -@var{abstime}, the mutex @var{mutex} is re-acquired and -@code{pthread_cond_timedwait} returns the error code @code{ETIMEDOUT}. -The wait can also be interrupted by a signal; in that case -@code{pthread_cond_timedwait} returns @code{EINTR}. - -The @var{abstime} parameter specifies an absolute time, with the same -origin as @code{time} and @code{gettimeofday}: an @var{abstime} of 0 -corresponds to 00:00:00 GMT, January 1, 1970. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_cond_destroy (pthread_cond_t *@var{cond}) -@code{pthread_cond_destroy} destroys the condition variable @var{cond}, -freeing the resources it might hold. If any threads are waiting on the -condition variable, @code{pthread_cond_destroy} leaves @var{cond} -untouched and returns @code{EBUSY}. Otherwise it returns 0, and -@var{cond} must not be used again until it is reinitialized. - -In the LinuxThreads implementation, no resources are associated with -condition variables, so @code{pthread_cond_destroy} actually does -nothing. -@end deftypefun - -@code{pthread_cond_wait} and @code{pthread_cond_timedwait} are -cancellation points. If a thread is canceled while suspended in one of -these functions, the thread immediately resumes execution, relocks the -mutex specified by @var{mutex}, and finally executes the cancellation. -Consequently, cleanup handlers are assured that @var{mutex} is locked -when they are called. - -It is not safe to call the condition variable functions from a signal -handler. In particular, calling @code{pthread_cond_signal} or -@code{pthread_cond_broadcast} from a signal handler may deadlock the -calling thread. - -Consider two shared variables @var{x} and @var{y}, protected by the -mutex @var{mut}, and a condition variable @var{cond} that is to be -signaled whenever @var{x} becomes greater than @var{y}. - -@smallexample -int x,y; -pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER; -pthread_cond_t cond = PTHREAD_COND_INITIALIZER; -@end smallexample - -Waiting until @var{x} is greater than @var{y} is performed as follows: - -@smallexample -pthread_mutex_lock(&mut); -while (x <= y) @{ - pthread_cond_wait(&cond, &mut); -@} -/* operate on x and y */ -pthread_mutex_unlock(&mut); -@end smallexample - -Modifications on @var{x} and @var{y} that may cause @var{x} to become greater than -@var{y} should signal the condition if needed: - -@smallexample -pthread_mutex_lock(&mut); -/* modify x and y */ -if (x > y) pthread_cond_broadcast(&cond); -pthread_mutex_unlock(&mut); -@end smallexample - -If it can be proved that at most one waiting thread needs to be waken -up (for instance, if there are only two threads communicating through -@var{x} and @var{y}), @code{pthread_cond_signal} can be used as a slightly more -efficient alternative to @code{pthread_cond_broadcast}. In doubt, use -@code{pthread_cond_broadcast}. - -To wait for @var{x} to becomes greater than @var{y} with a timeout of 5 -seconds, do: - -@smallexample -struct timeval now; -struct timespec timeout; -int retcode; - -pthread_mutex_lock(&mut); -gettimeofday(&now); -timeout.tv_sec = now.tv_sec + 5; -timeout.tv_nsec = now.tv_usec * 1000; -retcode = 0; -while (x <= y && retcode != ETIMEDOUT) @{ - retcode = pthread_cond_timedwait(&cond, &mut, &timeout); -@} -if (retcode == ETIMEDOUT) @{ - /* timeout occurred */ -@} else @{ - /* operate on x and y */ -@} -pthread_mutex_unlock(&mut); -@end smallexample - -Condition attributes can be specified at condition creation time, by -passing a condition attribute object as second argument to -@code{pthread_cond_init}. Passing @code{NULL} is equivalent to passing -a condition attribute object with all attributes set to their default -values. - -The LinuxThreads implementation supports no attributes for -conditions. The functions on condition attributes are included only for -compliance with the POSIX standard. - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_condattr_init (pthread_condattr_t *@var{attr}) -@deftypefunx int pthread_condattr_destroy (pthread_condattr_t *@var{attr}) -@code{pthread_condattr_init} initializes the condition attribute object -@var{attr} and fills it with default values for the attributes. -@code{pthread_condattr_destroy} destroys the condition attribute object -@var{attr}. - -Both functions do nothing in the LinuxThreads implementation. - -@code{pthread_condattr_init} and @code{pthread_condattr_destroy} always -return 0. -@end deftypefun - -@node POSIX Semaphores -@section POSIX Semaphores - -@vindex SEM_VALUE_MAX -Semaphores are counters for resources shared between threads. The -basic operations on semaphores are: increment the counter atomically, -and wait until the counter is non-null and decrement it atomically. - -Semaphores have a maximum value past which they cannot be incremented. -The macro @code{SEM_VALUE_MAX} is defined to be this maximum value. In -the GNU C library, @code{SEM_VALUE_MAX} is equal to @code{INT_MAX} -(@pxref{Range of Type}), but it may be much smaller on other systems. - -The pthreads library implements POSIX 1003.1b semaphores. These should -not be confused with System V semaphores (@code{ipc}, @code{semctl} and -@code{semop}). -@c !!! SysV IPC is not doc'd at all in our manual - -All the semaphore functions and macros are defined in @file{semaphore.h}. - -@comment semaphore.h -@comment POSIX -@deftypefun int sem_init (sem_t *@var{sem}, int @var{pshared}, unsigned int @var{value}) -@code{sem_init} initializes the semaphore object pointed to by -@var{sem}. The count associated with the semaphore is set initially to -@var{value}. The @var{pshared} argument indicates whether the semaphore -is local to the current process (@var{pshared} is zero) or is to be -shared between several processes (@var{pshared} is not zero). - -On success @code{sem_init} returns 0. On failure it returns -1 and sets -@var{errno} to one of the following values: - -@table @code -@item EINVAL -@var{value} exceeds the maximal counter value @code{SEM_VALUE_MAX} - -@item ENOSYS -@var{pshared} is not zero. LinuxThreads currently does not support -process-shared semaphores. (This will eventually change.) -@end table -@end deftypefun - -@comment semaphore.h -@comment POSIX -@deftypefun int sem_destroy (sem_t * @var{sem}) -@code{sem_destroy} destroys a semaphore object, freeing the resources it -might hold. If any threads are waiting on the semaphore when -@code{sem_destroy} is called, it fails and sets @var{errno} to -@code{EBUSY}. - -In the LinuxThreads implementation, no resources are associated with -semaphore objects, thus @code{sem_destroy} actually does nothing except -checking that no thread is waiting on the semaphore. This will change -when process-shared semaphores are implemented. -@end deftypefun - -@comment semaphore.h -@comment POSIX -@deftypefun int sem_wait (sem_t * @var{sem}) -@code{sem_wait} suspends the calling thread until the semaphore pointed -to by @var{sem} has non-zero count. It then atomically decreases the -semaphore count. - -@code{sem_wait} is a cancellation point. It always returns 0. -@end deftypefun - -@comment semaphore.h -@comment POSIX -@deftypefun int sem_trywait (sem_t * @var{sem}) -@code{sem_trywait} is a non-blocking variant of @code{sem_wait}. If the -semaphore pointed to by @var{sem} has non-zero count, the count is -atomically decreased and @code{sem_trywait} immediately returns 0. If -the semaphore count is zero, @code{sem_trywait} immediately returns -1 -and sets errno to @code{EAGAIN}. -@end deftypefun - -@comment semaphore.h -@comment POSIX -@deftypefun int sem_post (sem_t * @var{sem}) -@code{sem_post} atomically increases the count of the semaphore pointed to -by @var{sem}. This function never blocks. - -@c !!! This para appears not to agree with the code. -On processors supporting atomic compare-and-swap (Intel 486, Pentium and -later, Alpha, PowerPC, MIPS II, Motorola 68k, Ultrasparc), the -@code{sem_post} function is can safely be called from signal handlers. -This is the only thread synchronization function provided by POSIX -threads that is async-signal safe. On the Intel 386 and earlier Sparc -chips, the current LinuxThreads implementation of @code{sem_post} is not -async-signal safe, because the hardware does not support the required -atomic operations. - -@code{sem_post} always succeeds and returns 0, unless the semaphore -count would exceed @code{SEM_VALUE_MAX} after being incremented. In -that case @code{sem_post} returns -1 and sets @var{errno} to -@code{EINVAL}. The semaphore count is left unchanged. -@end deftypefun - -@comment semaphore.h -@comment POSIX -@deftypefun int sem_getvalue (sem_t * @var{sem}, int * @var{sval}) -@code{sem_getvalue} stores in the location pointed to by @var{sval} the -current count of the semaphore @var{sem}. It always returns 0. -@end deftypefun - -@node Thread-Specific Data -@section Thread-Specific Data - -Programs often need global or static variables that have different -values in different threads. Since threads share one memory space, this -cannot be achieved with regular variables. Thread-specific data is the -POSIX threads answer to this need. - -Each thread possesses a private memory block, the thread-specific data -area, or TSD area for short. This area is indexed by TSD keys. The TSD -area associates values of type @code{void *} to TSD keys. TSD keys are -common to all threads, but the value associated with a given TSD key can -be different in each thread. - -For concreteness, the TSD areas can be viewed as arrays of @code{void *} -pointers, TSD keys as integer indices into these arrays, and the value -of a TSD key as the value of the corresponding array element in the -calling thread. - -When a thread is created, its TSD area initially associates @code{NULL} -with all keys. - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_key_create (pthread_key_t *@var{key}, void (*destr_function) (void *)) -@code{pthread_key_create} allocates a new TSD key. The key is stored in -the location pointed to by @var{key}. There is a limit of -@code{PTHREAD_KEYS_MAX} on the number of keys allocated at a given -time. The value initially associated with the returned key is -@code{NULL} in all currently executing threads. - -The @var{destr_function} argument, if not @code{NULL}, specifies a -destructor function associated with the key. When a thread terminates -via @code{pthread_exit} or by cancellation, @var{destr_function} is -called on the value associated with the key in that thread. The -@var{destr_function} is not called if a key is deleted with -@code{pthread_key_delete} or a value is changed with -@code{pthread_setspecific}. The order in which destructor functions are -called at thread termination time is unspecified. - -Before the destructor function is called, the @code{NULL} value is -associated with the key in the current thread. A destructor function -might, however, re-associate non-@code{NULL} values to that key or some -other key. To deal with this, if after all the destructors have been -called for all non-@code{NULL} values, there are still some -non-@code{NULL} values with associated destructors, then the process is -repeated. The LinuxThreads implementation stops the process after -@code{PTHREAD_DESTRUCTOR_ITERATIONS} iterations, even if some -non-@code{NULL} values with associated descriptors remain. Other -implementations may loop indefinitely. - -@code{pthread_key_create} returns 0 unless @code{PTHREAD_KEYS_MAX} keys -have already been allocated, in which case it fails and returns -@code{EAGAIN}. -@end deftypefun - - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_key_delete (pthread_key_t @var{key}) -@code{pthread_key_delete} deallocates a TSD key. It does not check -whether non-@code{NULL} values are associated with that key in the -currently executing threads, nor call the destructor function associated -with the key. - -If there is no such key @var{key}, it returns @code{EINVAL}. Otherwise -it returns 0. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_setspecific (pthread_key_t @var{key}, const void *@var{pointer}) -@code{pthread_setspecific} changes the value associated with @var{key} -in the calling thread, storing the given @var{pointer} instead. - -If there is no such key @var{key}, it returns @code{EINVAL}. Otherwise -it returns 0. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun {void *} pthread_getspecific (pthread_key_t @var{key}) -@code{pthread_getspecific} returns the value currently associated with -@var{key} in the calling thread. - -If there is no such key @var{key}, it returns @code{NULL}. -@end deftypefun - -The following code fragment allocates a thread-specific array of 100 -characters, with automatic reclaimation at thread exit: - -@smallexample -/* Key for the thread-specific buffer */ -static pthread_key_t buffer_key; - -/* Once-only initialisation of the key */ -static pthread_once_t buffer_key_once = PTHREAD_ONCE_INIT; - -/* Allocate the thread-specific buffer */ -void buffer_alloc(void) -@{ - pthread_once(&buffer_key_once, buffer_key_alloc); - pthread_setspecific(buffer_key, malloc(100)); -@} - -/* Return the thread-specific buffer */ -char * get_buffer(void) -@{ - return (char *) pthread_getspecific(buffer_key); -@} - -/* Allocate the key */ -static void buffer_key_alloc() -@{ - pthread_key_create(&buffer_key, buffer_destroy); -@} - -/* Free the thread-specific buffer */ -static void buffer_destroy(void * buf) -@{ - free(buf); -@} -@end smallexample - -@node Threads and Signal Handling -@section Threads and Signal Handling - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_sigmask (int @var{how}, const sigset_t *@var{newmask}, sigset_t *@var{oldmask}) -@code{pthread_sigmask} changes the signal mask for the calling thread as -described by the @var{how} and @var{newmask} arguments. If @var{oldmask} -is not @code{NULL}, the previous signal mask is stored in the location -pointed to by @var{oldmask}. - -The meaning of the @var{how} and @var{newmask} arguments is the same as -for @code{sigprocmask}. If @var{how} is @code{SIG_SETMASK}, the signal -mask is set to @var{newmask}. If @var{how} is @code{SIG_BLOCK}, the -signals specified to @var{newmask} are added to the current signal mask. -If @var{how} is @code{SIG_UNBLOCK}, the signals specified to -@var{newmask} are removed from the current signal mask. - -Recall that signal masks are set on a per-thread basis, but signal -actions and signal handlers, as set with @code{sigaction}, are shared -between all threads. - -The @code{pthread_sigmask} function returns 0 on success, and one of the -following error codes on error: -@table @code -@item EINVAL -@var{how} is not one of @code{SIG_SETMASK}, @code{SIG_BLOCK}, or @code{SIG_UNBLOCK} - -@item EFAULT -@var{newmask} or @var{oldmask} point to invalid addresses -@end table -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_kill (pthread_t @var{thread}, int @var{signo}) -@code{pthread_kill} sends signal number @var{signo} to the thread -@var{thread}. The signal is delivered and handled as described in -@ref{Signal Handling}. - -@code{pthread_kill} returns 0 on success, one of the following error codes -on error: -@table @code -@item EINVAL -@var{signo} is not a valid signal number - -@item ESRCH -The thread @var{thread} does not exist (e.g. it has already terminated) -@end table -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int sigwait (const sigset_t *@var{set}, int *@var{sig}) -@code{sigwait} suspends the calling thread until one of the signals in -@var{set} is delivered to the calling thread. It then stores the number -of the signal received in the location pointed to by @var{sig} and -returns. The signals in @var{set} must be blocked and not ignored on -entrance to @code{sigwait}. If the delivered signal has a signal handler -function attached, that function is @emph{not} called. - -@code{sigwait} is a cancellation point. It always returns 0. -@end deftypefun - -For @code{sigwait} to work reliably, the signals being waited for must be -blocked in all threads, not only in the calling thread, since -otherwise the POSIX semantics for signal delivery do not guarantee -that it's the thread doing the @code{sigwait} that will receive the signal. -The best way to achieve this is block those signals before any threads -are created, and never unblock them in the program other than by -calling @code{sigwait}. - -Signal handling in LinuxThreads departs significantly from the POSIX -standard. According to the standard, ``asynchronous'' (external) signals -are addressed to the whole process (the collection of all threads), -which then delivers them to one particular thread. The thread that -actually receives the signal is any thread that does not currently block -the signal. - -In LinuxThreads, each thread is actually a kernel process with its own -PID, so external signals are always directed to one particular thread. -If, for instance, another thread is blocked in @code{sigwait} on that -signal, it will not be restarted. - -The LinuxThreads implementation of @code{sigwait} installs dummy signal -handlers for the signals in @var{set} for the duration of the -wait. Since signal handlers are shared between all threads, other -threads must not attach their own signal handlers to these signals, or -alternatively they should all block these signals (which is recommended -anyway). - -@node Threads and Fork -@section Threads and Fork - -It's not intuitively obvious what should happen when a multi-threaded POSIX -process calls @code{fork}. Not only are the semantics tricky, but you may -need to write code that does the right thing at fork time even if that code -doesn't use the @code{fork} function. Moreover, you need to be aware of -interaction between @code{fork} and some library features like -@code{pthread_once} and stdio streams. - -When @code{fork} is called by one of the threads of a process, it creates a new -process which is copy of the calling process. Effectively, in addition to -copying certain system objects, the function takes a snapshot of the memory -areas of the parent process, and creates identical areas in the child. -To make matters more complicated, with threads it's possible for two or more -threads to concurrently call fork to create two or more child processes. - -The child process has a copy of the address space of the parent, but it does -not inherit any of its threads. Execution of the child process is carried out -by a new thread which returns from @code{fork} function with a return value of -zero; it is the only thread in the child process. Because threads are not -inherited across fork, issues arise. At the time of the call to @code{fork}, -threads in the parent process other than the one calling @code{fork} may have -been executing critical regions of code. As a result, the child process may -get a copy of objects that are not in a well-defined state. This potential -problem affects all components of the program. - -Any program component which will continue being used in a child process must -correctly handle its state during @code{fork}. For this purpose, the POSIX -interface provides the special function @code{pthread_atfork} for installing -pointers to handler functions which are called from within @code{fork}. - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_atfork (void (*@var{prepare})(void), void (*@var{parent})(void), void (*@var{child})(void)) - -@code{pthread_atfork} registers handler functions to be called just -before and just after a new process is created with @code{fork}. The -@var{prepare} handler will be called from the parent process, just -before the new process is created. The @var{parent} handler will be -called from the parent process, just before @code{fork} returns. The -@var{child} handler will be called from the child process, just before -@code{fork} returns. - -@code{pthread_atfork} returns 0 on success and a non-zero error code on -error. - -One or more of the three handlers @var{prepare}, @var{parent} and -@var{child} can be given as @code{NULL}, meaning that no handler needs -to be called at the corresponding point. - -@code{pthread_atfork} can be called several times to install several -sets of handlers. At @code{fork} time, the @var{prepare} handlers are -called in LIFO order (last added with @code{pthread_atfork}, first -called before @code{fork}), while the @var{parent} and @var{child} -handlers are called in FIFO order (first added, first called). - -If there is insufficient memory available to register the handlers, -@code{pthread_atfork} fails and returns @code{ENOMEM}. Otherwise it -returns 0. - -The functions @code{fork} and @code{pthread_atfork} must not be regarded as -reentrant from the context of the handlers. That is to say, if a -@code{pthread_atfork} handler invoked from within @code{fork} calls -@code{pthread_atfork} or @code{fork}, the behavior is undefined. - -Registering a triplet of handlers is an atomic operation with respect to fork. -If new handlers are registered at about the same time as a fork occurs, either -all three handlers will be called, or none of them will be called. - -The handlers are inherited by the child process, and there is no -way to remove them, short of using @code{exec} to load a new -pocess image. - -@end deftypefun - -To understand the purpose of @code{pthread_atfork}, recall that -@code{fork} duplicates the whole memory space, including mutexes in -their current locking state, but only the calling thread: other threads -are not running in the child process. The mutexes are not usable after -the @code{fork} and must be initialized with @code{pthread_mutex_init} -in the child process. This is a limitation of the current -implementation and might or might not be present in future versions. - -To avoid this, install handlers with @code{pthread_atfork} as follows: have the -@var{prepare} handler lock the mutexes (in locking order), and the -@var{parent} handler unlock the mutexes. The @var{child} handler should reset -the mutexes using @code{pthread_mutex_init}, as well as any other -synchronization objects such as condition variables. - -Locking the global mutexes before the fork ensures that all other threads are -locked out of the critical regions of code protected by those mutexes. Thus -when @code{fork} takes a snapshot of the parent's address space, that snapshot -will copy valid, stable data. Resetting the synchronization objects in the -child process will ensure they are properly cleansed of any artifacts from the -threading subsystem of the parent process. For example, a mutex may inherit -a wait queue of threads waiting for the lock; this wait queue makes no sense -in the child process. Initializing the mutex takes care of this. - -@node Streams and Fork -@section Streams and Fork - -The GNU standard I/O library has an internal mutex which guards the internal -linked list of all standard C FILE objects. This mutex is properly taken care -of during @code{fork} so that the child receives an intact copy of the list. -This allows the @code{fopen} function, and related stream-creating functions, -to work correctly in the child process, since these functions need to insert -into the list. - -However, the individual stream locks are not completely taken care of. Thus -unless the multithreaded application takes special precautions in its use of -@code{fork}, the child process might not be able to safely use the streams that -it inherited from the parent. In general, for any given open stream in the -parent that is to be used by the child process, the application must ensure -that that stream is not in use by another thread when @code{fork} is called. -Otherwise an inconsistent copy of the stream object be produced. An easy way to -ensure this is to use @code{flockfile} to lock the stream prior to calling -@code{fork} and then unlock it with @code{funlockfile} inside the parent -process, provided that the parent's threads properly honor these locks. -Nothing special needs to be done in the child process, since the library -internally resets all stream locks. - -Note that the stream locks are not shared between the parent and child. -For example, even if you ensure that, say, the stream @code{stdout} is properly -treated and can be safely used in the child, the stream locks do not provide -an exclusion mechanism between the parent and child. If both processes write -to @code{stdout}, strangely interleaved output may result regardless of -the explicit use of @code{flockfile} or implicit locks. - -Also note that these provisions are a GNU extension; other systems might not -provide any way for streams to be used in the child of a multithreaded process. -POSIX requires that such a child process confines itself to calling only -asynchronous safe functions, which excludes much of the library, including -standard I/O. - -@node Miscellaneous Thread Functions -@section Miscellaneous Thread Functions - -@comment pthread.h -@comment POSIX -@deftypefun {pthread_t} pthread_self (@var{void}) -@code{pthread_self} returns the thread identifier for the calling thread. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_equal (pthread_t thread1, pthread_t thread2) -@code{pthread_equal} determines if two thread identifiers refer to the same -thread. - -A non-zero value is returned if @var{thread1} and @var{thread2} refer to -the same thread. Otherwise, 0 is returned. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_detach (pthread_t @var{th}) -@code{pthread_detach} puts the thread @var{th} in the detached -state. This guarantees that the memory resources consumed by @var{th} -will be freed immediately when @var{th} terminates. However, this -prevents other threads from synchronizing on the termination of @var{th} -using @code{pthread_join}. - -A thread can be created initially in the detached state, using the -@code{detachstate} attribute to @code{pthread_create}. In contrast, -@code{pthread_detach} applies to threads created in the joinable state, -and which need to be put in the detached state later. - -After @code{pthread_detach} completes, subsequent attempts to perform -@code{pthread_join} on @var{th} will fail. If another thread is already -joining the thread @var{th} at the time @code{pthread_detach} is called, -@code{pthread_detach} does nothing and leaves @var{th} in the joinable -state. - -On success, 0 is returned. On error, one of the following codes is -returned: -@table @code -@item ESRCH -No thread could be found corresponding to that specified by @var{th} -@item EINVAL -The thread @var{th} is already in the detached state -@end table -@end deftypefun - -@comment pthread.h -@comment GNU -@deftypefun void pthread_kill_other_threads_np (@var{void}) -@code{pthread_kill_other_threads_np} is a non-portable LinuxThreads extension. -It causes all threads in the program to terminate immediately, except -the calling thread which proceeds normally. It is intended to be -called just before a thread calls one of the @code{exec} functions, -e.g. @code{execve}. - -Termination of the other threads is not performed through -@code{pthread_cancel} and completely bypasses the cancellation -mechanism. Hence, the current settings for cancellation state and -cancellation type are ignored, and the cleanup handlers are not -executed in the terminated threads. - -According to POSIX 1003.1c, a successful @code{exec*} in one of the -threads should automatically terminate all other threads in the program. -This behavior is not yet implemented in LinuxThreads. Calling -@code{pthread_kill_other_threads_np} before @code{exec*} achieves much -of the same behavior, except that if @code{exec*} ultimately fails, then -all other threads are already killed. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_once (pthread_once_t *once_@var{control}, void (*@var{init_routine}) (void)) - -The purpose of @code{pthread_once} is to ensure that a piece of -initialization code is executed at most once. The @var{once_control} -argument points to a static or extern variable statically initialized -to @code{PTHREAD_ONCE_INIT}. - -The first time @code{pthread_once} is called with a given -@var{once_control} argument, it calls @var{init_routine} with no -argument and changes the value of the @var{once_control} variable to -record that initialization has been performed. Subsequent calls to -@code{pthread_once} with the same @code{once_control} argument do -nothing. - -If a thread is cancelled while executing @var{init_routine} -the state of the @var{once_control} variable is reset so that -a future call to @code{pthread_once} will call the routine again. - -If the process forks while one or more threads are executing -@code{pthread_once} initialization routines, the states of their respective -@var{once_control} variables will appear to be reset in the child process so -that if the child calls @code{pthread_once}, the routines will be executed. - -@code{pthread_once} always returns 0. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_setschedparam (pthread_t target_@var{thread}, int @var{policy}, const struct sched_param *@var{param}) - -@code{pthread_setschedparam} sets the scheduling parameters for the -thread @var{target_thread} as indicated by @var{policy} and -@var{param}. @var{policy} can be either @code{SCHED_OTHER} (regular, -non-realtime scheduling), @code{SCHED_RR} (realtime, round-robin) or -@code{SCHED_FIFO} (realtime, first-in first-out). @var{param} specifies -the scheduling priority for the two realtime policies. See -@code{sched_setpolicy} for more information on scheduling policies. - -The realtime scheduling policies @code{SCHED_RR} and @code{SCHED_FIFO} -are available only to processes with superuser privileges. - -On success, @code{pthread_setschedparam} returns 0. On error it returns -one of the following codes: -@table @code -@item EINVAL -@var{policy} is not one of @code{SCHED_OTHER}, @code{SCHED_RR}, -@code{SCHED_FIFO}, or the priority value specified by @var{param} is not -valid for the specified policy - -@item EPERM -Realtime scheduling was requested but the calling process does not have -sufficient privileges. - -@item ESRCH -The @var{target_thread} is invalid or has already terminated - -@item EFAULT -@var{param} points outside the process memory space -@end table -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_getschedparam (pthread_t target_@var{thread}, int *@var{policy}, struct sched_param *@var{param}) - -@code{pthread_getschedparam} retrieves the scheduling policy and -scheduling parameters for the thread @var{target_thread} and stores them -in the locations pointed to by @var{policy} and @var{param}, -respectively. - -@code{pthread_getschedparam} returns 0 on success, or one of the -following error codes on failure: -@table @code -@item ESRCH -The @var{target_thread} is invalid or has already terminated. - -@item EFAULT -@var{policy} or @var{param} point outside the process memory space. - -@end table -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_setconcurrency (int @var{level}) -@code{pthread_setconcurrency} is unused in LinuxThreads due to the lack -of a mapping of user threads to kernel threads. It exists for source -compatibility. It does store the value @var{level} so that it can be -returned by a subsequent call to @code{pthread_getconcurrency}. It takes -no other action however. -@end deftypefun - -@comment pthread.h -@comment POSIX -@deftypefun int pthread_getconcurrency () -@code{pthread_getconcurrency} is unused in LinuxThreads due to the lack -of a mapping of user threads to kernel threads. It exists for source -compatibility. However, it will return the value that was set by the -last call to @code{pthread_setconcurrency}. -@end deftypefun diff --git a/libpthread/linuxthreads/locale.c b/libpthread/linuxthreads/locale.c deleted file mode 100644 index c3ebbc285..000000000 --- a/libpthread/linuxthreads/locale.c +++ /dev/null @@ -1,58 +0,0 @@ -/* Copyright (C) 2003 Manuel Novoa III - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the Free - * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#define _GNU_SOURCE -#include <features.h> -#include "pthread.h" -#include "internals.h" -#include <locale.h> -#include <assert.h> -#include <stdlib.h> - -extern struct _pthread_descr_struct __pthread_initial_thread; - -__locale_t __curlocale(void) -{ - pthread_descr self = thread_self(); - -#ifdef NDEBUG - return THREAD_GETMEM (self, locale); -#else - { - __locale_t r = THREAD_GETMEM (self, locale); - - assert(r); - - return r; - } -#endif -} - -__locale_t __curlocale_set(__locale_t newloc) -{ - __locale_t oldloc; - pthread_descr self = thread_self(); - - oldloc = THREAD_GETMEM (self, locale); - - assert(newloc != LC_GLOBAL_LOCALE); - assert(oldloc); - - THREAD_SETMEM (self, locale, newloc); - - return oldloc; -} diff --git a/libpthread/linuxthreads/lockfile.c b/libpthread/linuxthreads/lockfile.c deleted file mode 100644 index b0f41c98a..000000000 --- a/libpthread/linuxthreads/lockfile.c +++ /dev/null @@ -1,39 +0,0 @@ -/* lockfile - Handle locking and unlocking of stream. - Copyright (C) 1996, 1998, 2000 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include <stdio.h> -#include <pthread.h> - -/* Note: glibc puts flockfile, funlockfile, and ftrylockfile in both - * libc and libpthread. In uClibc, they are now in libc only. */ - -void -__fresetlockfiles (void) -{ - FILE *fp; - pthread_mutexattr_t attr; - - pthread_mutexattr_init(&attr); - pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE_NP); - - for (fp = _stdio_openlist; fp != NULL; fp = fp->__nextopen) - pthread_mutex_init(&fp->__lock, &attr); - - pthread_mutexattr_destroy(&attr); -} diff --git a/libpthread/linuxthreads/manager.c b/libpthread/linuxthreads/manager.c deleted file mode 100644 index 204344aef..000000000 --- a/libpthread/linuxthreads/manager.c +++ /dev/null @@ -1,905 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* The "thread manager" thread: manages creation and termination of threads */ - -/* mods for uClibc: getpwd and getpagesize are the syscalls */ -#define __getpid getpid -#define __getpagesize getpagesize - -#include <features.h> -#define __USE_GNU -#include <errno.h> -#include <sched.h> -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <sys/poll.h> /* for poll */ -#include <sys/mman.h> /* for mmap */ -#include <sys/param.h> -#include <sys/time.h> -#include <sys/wait.h> /* for waitpid macros */ - -#include "pthread.h" -#include "internals.h" -#include "spinlock.h" -#include "restart.h" -#include "semaphore.h" -#include "debug.h" /* PDEBUG, added by StS */ - - -/* poll() is not supported in kernel <= 2.0, therefore is __NR_poll is - * not available, we assume an old Linux kernel is in use and we will - * use select() instead. */ -#include <sys/syscall.h> -#ifndef __NR_poll -# define USE_SELECT -#endif - - -/* Array of active threads. Entry 0 is reserved for the initial thread. */ -struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX] = -{ { __LOCK_INITIALIZER, &__pthread_initial_thread, 0}, - { __LOCK_INITIALIZER, &__pthread_manager_thread, 0}, /* All NULLs */ }; - -/* For debugging purposes put the maximum number of threads in a variable. */ -const int __linuxthreads_pthread_threads_max = PTHREAD_THREADS_MAX; - -/* Indicate whether at least one thread has a user-defined stack (if 1), - or if all threads have stacks supplied by LinuxThreads (if 0). */ -int __pthread_nonstandard_stacks; - -/* Number of active entries in __pthread_handles (used by gdb) */ -volatile int __pthread_handles_num = 2; - -/* Whether to use debugger additional actions for thread creation - (set to 1 by gdb) */ -volatile int __pthread_threads_debug; - -/* Globally enabled events. */ -volatile td_thr_events_t __pthread_threads_events; - -/* Pointer to thread descriptor with last event. */ -volatile pthread_descr __pthread_last_event; - -/* Mapping from stack segment to thread descriptor. */ -/* Stack segment numbers are also indices into the __pthread_handles array. */ -/* Stack segment number 0 is reserved for the initial thread. */ - -static inline pthread_descr thread_segment(int seg) -{ - return (pthread_descr)(THREAD_STACK_START_ADDRESS - (seg - 1) * STACK_SIZE) - - 1; -} - -/* Flag set in signal handler to record child termination */ - -static volatile int terminated_children = 0; - -/* Flag set when the initial thread is blocked on pthread_exit waiting - for all other threads to terminate */ - -static int main_thread_exiting = 0; - -/* Counter used to generate unique thread identifier. - Thread identifier is pthread_threads_counter + segment. */ - -static pthread_t pthread_threads_counter = 0; - -/* Forward declarations */ - -static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, - void * (*start_routine)(void *), void *arg, - sigset_t *mask, int father_pid, - int report_events, - td_thr_events_t *event_maskp); -static void pthread_handle_free(pthread_t th_id); -static void pthread_handle_exit(pthread_descr issuing_thread, int exitcode); -static void pthread_reap_children(void); -static void pthread_kill_all_threads(int sig, int main_thread_also); - -/* The server thread managing requests for thread creation and termination */ - -int __pthread_manager(void *arg) -{ - int reqfd = (int) (long int) arg; -#ifdef USE_SELECT - struct timeval tv; - fd_set fd; -#else - struct pollfd ufd; -#endif - sigset_t manager_mask; - int n; - struct pthread_request request; - - /* If we have special thread_self processing, initialize it. */ -#ifdef INIT_THREAD_SELF - INIT_THREAD_SELF(&__pthread_manager_thread, 1); -#endif - /* Set the error variable. */ - __pthread_manager_thread.p_errnop = &__pthread_manager_thread.p_errno; - __pthread_manager_thread.p_h_errnop = &__pthread_manager_thread.p_h_errno; - -#ifdef __UCLIBC_HAS_XLOCALE__ - /* Initialize thread's locale to the global locale. */ - __pthread_manager_thread.locale = __global_locale; -#endif /* __UCLIBC_HAS_XLOCALE__ */ - - /* Block all signals except __pthread_sig_cancel and SIGTRAP */ - sigfillset(&manager_mask); - sigdelset(&manager_mask, __pthread_sig_cancel); /* for thread termination */ - sigdelset(&manager_mask, SIGTRAP); /* for debugging purposes */ - if (__pthread_threads_debug && __pthread_sig_debug > 0) - sigdelset(&manager_mask, __pthread_sig_debug); - sigprocmask(SIG_SETMASK, &manager_mask, NULL); - /* Raise our priority to match that of main thread */ - __pthread_manager_adjust_prio(__pthread_main_thread->p_priority); - /* Synchronize debugging of the thread manager */ - n = TEMP_FAILURE_RETRY(__libc_read(reqfd, (char *)&request, - sizeof(request))); - ASSERT(n == sizeof(request) && request.req_kind == REQ_DEBUG); -#ifndef USE_SELECT - ufd.fd = reqfd; - ufd.events = POLLIN; -#endif - /* Enter server loop */ - while(1) { -#ifdef USE_SELECT - tv.tv_sec = 2; - tv.tv_usec = 0; - FD_ZERO (&fd); - FD_SET (reqfd, &fd); - n = select (reqfd + 1, &fd, NULL, NULL, &tv); -#else - PDEBUG("before poll\n"); - n = poll(&ufd, 1, 2000); - PDEBUG("after poll\n"); -#endif - /* Check for termination of the main thread */ - if (getppid() == 1) { - pthread_kill_all_threads(SIGKILL, 0); - _exit(0); - } - /* Check for dead children */ - if (terminated_children) { - terminated_children = 0; - pthread_reap_children(); - } - /* Read and execute request */ -#ifdef USE_SELECT - if (n == 1) -#else - if (n == 1 && (ufd.revents & POLLIN)) -#endif - { - - PDEBUG("before __libc_read\n"); - n = __libc_read(reqfd, (char *)&request, sizeof(request)); - PDEBUG("after __libc_read, n=%d\n", n); - ASSERT(n == sizeof(request)); - switch(request.req_kind) { - case REQ_CREATE: - PDEBUG("got REQ_CREATE\n"); - request.req_thread->p_retcode = - pthread_handle_create((pthread_t *) &request.req_thread->p_retval, - request.req_args.create.attr, - request.req_args.create.fn, - request.req_args.create.arg, - &request.req_args.create.mask, - request.req_thread->p_pid, - request.req_thread->p_report_events, - &request.req_thread->p_eventbuf.eventmask); - PDEBUG("restarting %d\n", request.req_thread); - restart(request.req_thread); - break; - case REQ_FREE: - PDEBUG("got REQ_FREE\n"); - pthread_handle_free(request.req_args.free.thread_id); - break; - case REQ_PROCESS_EXIT: - PDEBUG("got REQ_PROCESS_EXIT from %d, exit code = %d\n", - request.req_thread, request.req_args.exit.code); - pthread_handle_exit(request.req_thread, - request.req_args.exit.code); - break; - case REQ_MAIN_THREAD_EXIT: - PDEBUG("got REQ_MAIN_THREAD_EXIT\n"); - main_thread_exiting = 1; - /* Reap children in case all other threads died and the signal handler - went off before we set main_thread_exiting to 1, and therefore did - not do REQ_KICK. */ - pthread_reap_children(); - - if (__pthread_main_thread->p_nextlive == __pthread_main_thread) { - restart(__pthread_main_thread); - /* The main thread will now call exit() which will trigger an - __on_exit handler, which in turn will send REQ_PROCESS_EXIT - to the thread manager. In case you are wondering how the - manager terminates from its loop here. */ - } - break; - case REQ_POST: - PDEBUG("got REQ_POST\n"); - __new_sem_post(request.req_args.post); - break; - case REQ_DEBUG: - PDEBUG("got REQ_DEBUG\n"); - /* Make gdb aware of new thread and gdb will restart the - new thread when it is ready to handle the new thread. */ - if (__pthread_threads_debug && __pthread_sig_debug > 0) { - PDEBUG("about to call raise(__pthread_sig_debug)\n"); - raise(__pthread_sig_debug); - } - case REQ_KICK: - /* This is just a prod to get the manager to reap some - threads right away, avoiding a potential delay at shutdown. */ - break; - } - } - } -} - -int __pthread_manager_event(void *arg) -{ - /* If we have special thread_self processing, initialize it. */ -#ifdef INIT_THREAD_SELF - INIT_THREAD_SELF(&__pthread_manager_thread, 1); -#endif - - /* Get the lock the manager will free once all is correctly set up. */ - __pthread_lock (THREAD_GETMEM((&__pthread_manager_thread), p_lock), NULL); - /* Free it immediately. */ - __pthread_unlock (THREAD_GETMEM((&__pthread_manager_thread), p_lock)); - - return __pthread_manager(arg); -} - -/* Process creation */ -static int -__attribute__ ((noreturn)) -pthread_start_thread(void *arg) -{ - pthread_descr self = (pthread_descr) arg; - struct pthread_request request; - void * outcome; - /* Initialize special thread_self processing, if any. */ -#ifdef INIT_THREAD_SELF - INIT_THREAD_SELF(self, self->p_nr); -#endif - PDEBUG("\n"); - /* Make sure our pid field is initialized, just in case we get there - before our father has initialized it. */ - THREAD_SETMEM(self, p_pid, __getpid()); - /* Initial signal mask is that of the creating thread. (Otherwise, - we'd just inherit the mask of the thread manager.) */ - sigprocmask(SIG_SETMASK, &self->p_start_args.mask, NULL); - /* Set the scheduling policy and priority for the new thread, if needed */ - if (THREAD_GETMEM(self, p_start_args.schedpolicy) >= 0) - /* Explicit scheduling attributes were provided: apply them */ - sched_setscheduler(THREAD_GETMEM(self, p_pid), - THREAD_GETMEM(self, p_start_args.schedpolicy), - &self->p_start_args.schedparam); - else if (__pthread_manager_thread.p_priority > 0) - /* Default scheduling required, but thread manager runs in realtime - scheduling: switch new thread to SCHED_OTHER policy */ - { - struct sched_param default_params; - default_params.sched_priority = 0; - sched_setscheduler(THREAD_GETMEM(self, p_pid), - SCHED_OTHER, &default_params); - } - /* Make gdb aware of new thread */ - if (__pthread_threads_debug && __pthread_sig_debug > 0) { - request.req_thread = self; - request.req_kind = REQ_DEBUG; - TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request, - (char *) &request, sizeof(request))); - suspend(self); - } - /* Run the thread code */ - outcome = self->p_start_args.start_routine(THREAD_GETMEM(self, - p_start_args.arg)); - /* Exit with the given return value */ - pthread_exit(outcome); -} - -static int -__attribute__ ((noreturn)) -pthread_start_thread_event(void *arg) -{ - pthread_descr self = (pthread_descr) arg; - -#ifdef INIT_THREAD_SELF - INIT_THREAD_SELF(self, self->p_nr); -#endif - /* Make sure our pid field is initialized, just in case we get there - before our father has initialized it. */ - THREAD_SETMEM(self, p_pid, __getpid()); - /* Get the lock the manager will free once all is correctly set up. */ - __pthread_lock (THREAD_GETMEM(self, p_lock), NULL); - /* Free it immediately. */ - __pthread_unlock (THREAD_GETMEM(self, p_lock)); - - /* Continue with the real function. */ - pthread_start_thread (arg); -} - -static int pthread_allocate_stack(const pthread_attr_t *attr, - pthread_descr default_new_thread, - int pagesize, - pthread_descr * out_new_thread, - char ** out_new_thread_bottom, - char ** out_guardaddr, - size_t * out_guardsize) -{ - pthread_descr new_thread; - char * new_thread_bottom; - char * guardaddr; - size_t stacksize, guardsize; - - if (attr != NULL && attr->__stackaddr_set) - { - /* The user provided a stack. */ - new_thread = - (pthread_descr) ((long)(attr->__stackaddr) & -sizeof(void *)) - 1; - new_thread_bottom = (char *) attr->__stackaddr - attr->__stacksize; - guardaddr = NULL; - guardsize = 0; - __pthread_nonstandard_stacks = 1; - } - else - { -#ifdef __ARCH_HAS_MMU__ - stacksize = STACK_SIZE - pagesize; - if (attr != NULL) - stacksize = MIN (stacksize, roundup(attr->__stacksize, pagesize)); - /* Allocate space for stack and thread descriptor at default address */ - new_thread = default_new_thread; - new_thread_bottom = (char *) (new_thread + 1) - stacksize; - if (mmap((caddr_t)((char *)(new_thread + 1) - INITIAL_STACK_SIZE), - INITIAL_STACK_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC, - MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED | MAP_GROWSDOWN, - -1, 0) == MAP_FAILED) - /* Bad luck, this segment is already mapped. */ - return -1; - /* We manage to get a stack. Now see whether we need a guard - and allocate it if necessary. Notice that the default - attributes (stack_size = STACK_SIZE - pagesize) do not need - a guard page, since the RLIMIT_STACK soft limit prevents stacks - from running into one another. */ - if (stacksize == STACK_SIZE - pagesize) - { - /* We don't need a guard page. */ - guardaddr = NULL; - guardsize = 0; - } - else - { - /* Put a bad page at the bottom of the stack */ - guardsize = attr->__guardsize; - guardaddr = (void *)new_thread_bottom - guardsize; - if (mmap ((caddr_t) guardaddr, guardsize, 0, MAP_FIXED, -1, 0) - == MAP_FAILED) - { - /* We don't make this an error. */ - guardaddr = NULL; - guardsize = 0; - } - } -#else - /* We cannot mmap to this huge chunk of stack space when we don't have - * an MMU. Pretend we are using a user provided stack even if there was - * none provided by the user. Thus, we get around the mmap and reservation - * of a huge stack segment. -StS */ - - stacksize = INITIAL_STACK_SIZE; - /* The user may want to use a non-default stacksize */ - if (attr != NULL) - { - stacksize = attr->__stacksize; - } - - /* malloc a stack - memory from the bottom up */ - if ((new_thread_bottom = malloc(stacksize)) == NULL) - { - /* bad luck, we cannot malloc any more */ - return -1 ; - } - PDEBUG("malloced chunk: base=%p, size=0x%04x\n", new_thread_bottom, stacksize); - - /* Set up the pointers. new_thread marks the TOP of the stack frame and - * the address of the pthread_descr struct at the same time. Therefore we - * must account for its size and fit it in the malloc()'ed block. The - * value of `new_thread' is then passed to clone() as the stack argument. - * - * ^ +------------------------+ - * | | pthread_descr struct | - * | +------------------------+ <- new_thread - * malloc block | | | - * | | thread stack | - * | | | - * v +------------------------+ <- new_thread_bottom - * - * Note: The calculated value of new_thread must be word aligned otherwise - * the kernel chokes on a non-aligned stack frame. Choose the lower - * available word boundary. - */ - new_thread = ((pthread_descr) ((int)(new_thread_bottom + stacksize) & -sizeof(void*))) - 1; - guardaddr = NULL; - guardsize = 0; - - PDEBUG("thread stack: bos=%p, tos=%p\n", new_thread_bottom, new_thread); - - /* check the initial thread stack boundaries so they don't overlap */ - NOMMU_INITIAL_THREAD_BOUNDS((char *) new_thread, (char *) new_thread_bottom); - - PDEBUG("initial stack: bos=%p, tos=%p\n", __pthread_initial_thread_bos, - __pthread_initial_thread_tos); - - /* on non-MMU systems we always have non-standard stack frames */ - __pthread_nonstandard_stacks = 1; - -#endif /* __ARCH_HAS_MMU__ */ - } - - /* Clear the thread data structure. */ - memset (new_thread, '\0', sizeof (*new_thread)); - *out_new_thread = new_thread; - *out_new_thread_bottom = new_thread_bottom; - *out_guardaddr = guardaddr; - *out_guardsize = guardsize; - return 0; -} - -static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, - void * (*start_routine)(void *), void *arg, - sigset_t * mask, int father_pid, - int report_events, - td_thr_events_t *event_maskp) -{ - size_t sseg; - int pid; - pthread_descr new_thread; - char * new_thread_bottom; - pthread_t new_thread_id; - char *guardaddr = NULL; - size_t guardsize = 0; - int pagesize = __getpagesize(); - int saved_errno = 0; - - /* First check whether we have to change the policy and if yes, whether - we can do this. Normally this should be done by examining the - return value of the sched_setscheduler call in pthread_start_thread - but this is hard to implement. FIXME */ - if (attr != NULL && attr->__schedpolicy != SCHED_OTHER && geteuid () != 0) - return EPERM; - /* Find a free segment for the thread, and allocate a stack if needed */ - for (sseg = 2; ; sseg++) - { - if (sseg >= PTHREAD_THREADS_MAX) - return EAGAIN; - if (__pthread_handles[sseg].h_descr != NULL) - continue; - if (pthread_allocate_stack(attr, thread_segment(sseg), pagesize, - &new_thread, &new_thread_bottom, - &guardaddr, &guardsize) == 0) - break; - } - __pthread_handles_num++; - /* Allocate new thread identifier */ - pthread_threads_counter += PTHREAD_THREADS_MAX; - new_thread_id = sseg + pthread_threads_counter; - /* Initialize the thread descriptor. Elements which have to be - initialized to zero already have this value. */ - new_thread->p_tid = new_thread_id; - new_thread->p_lock = &(__pthread_handles[sseg].h_lock); - new_thread->p_cancelstate = PTHREAD_CANCEL_ENABLE; - new_thread->p_canceltype = PTHREAD_CANCEL_DEFERRED; - new_thread->p_errnop = &new_thread->p_errno; - new_thread->p_h_errnop = &new_thread->p_h_errno; -#ifdef __UCLIBC_HAS_XLOCALE__ - /* Initialize thread's locale to the global locale. */ - new_thread->locale = __global_locale; -#endif /* __UCLIBC_HAS_XLOCALE__ */ - new_thread->p_guardaddr = guardaddr; - new_thread->p_guardsize = guardsize; - new_thread->p_self = new_thread; - new_thread->p_nr = sseg; - /* Initialize the thread handle */ - __pthread_init_lock(&__pthread_handles[sseg].h_lock); - __pthread_handles[sseg].h_descr = new_thread; - __pthread_handles[sseg].h_bottom = new_thread_bottom; - /* Determine scheduling parameters for the thread */ - new_thread->p_start_args.schedpolicy = -1; - if (attr != NULL) { - new_thread->p_detached = attr->__detachstate; - new_thread->p_userstack = attr->__stackaddr_set; - - switch(attr->__inheritsched) { - case PTHREAD_EXPLICIT_SCHED: - new_thread->p_start_args.schedpolicy = attr->__schedpolicy; - memcpy (&new_thread->p_start_args.schedparam, &attr->__schedparam, - sizeof (struct sched_param)); - break; - case PTHREAD_INHERIT_SCHED: - new_thread->p_start_args.schedpolicy = sched_getscheduler(father_pid); - sched_getparam(father_pid, &new_thread->p_start_args.schedparam); - break; - } - new_thread->p_priority = - new_thread->p_start_args.schedparam.sched_priority; - } - /* Finish setting up arguments to pthread_start_thread */ - new_thread->p_start_args.start_routine = start_routine; - new_thread->p_start_args.arg = arg; - new_thread->p_start_args.mask = *mask; - /* Raise priority of thread manager if needed */ - __pthread_manager_adjust_prio(new_thread->p_priority); - /* Do the cloning. We have to use two different functions depending - on whether we are debugging or not. */ - pid = 0; /* Note that the thread never can have PID zero. */ - - - /* ******************************************************** */ - /* This code was moved from below to cope with running threads - * on uClinux systems. See comment below... - * Insert new thread in doubly linked list of active threads */ - new_thread->p_prevlive = __pthread_main_thread; - new_thread->p_nextlive = __pthread_main_thread->p_nextlive; - __pthread_main_thread->p_nextlive->p_prevlive = new_thread; - __pthread_main_thread->p_nextlive = new_thread; - /* ********************************************************* */ - - if (report_events) - { - /* See whether the TD_CREATE event bit is set in any of the - masks. */ - int idx = __td_eventword (TD_CREATE); - uint32_t mask = __td_eventmask (TD_CREATE); - - if ((mask & (__pthread_threads_events.event_bits[idx] - | event_maskp->event_bits[idx])) != 0) - { - /* Lock the mutex the child will use now so that it will stop. */ - __pthread_lock(new_thread->p_lock, NULL); - - /* We have to report this event. */ - pid = clone(pthread_start_thread_event, (void **) new_thread, - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | - __pthread_sig_cancel, new_thread); - - saved_errno = errno; - if (pid != -1) - { - /* Now fill in the information about the new thread in - the newly created thread's data structure. We cannot let - the new thread do this since we don't know whether it was - already scheduled when we send the event. */ - new_thread->p_eventbuf.eventdata = new_thread; - new_thread->p_eventbuf.eventnum = TD_CREATE; - __pthread_last_event = new_thread; - - /* We have to set the PID here since the callback function - in the debug library will need it and we cannot guarantee - the child got scheduled before the debugger. */ - new_thread->p_pid = pid; - - /* Now call the function which signals the event. */ - __linuxthreads_create_event (); - - /* Now restart the thread. */ - __pthread_unlock(new_thread->p_lock); - } - } - } - if (pid == 0) - { - PDEBUG("cloning new_thread = %p\n", new_thread); - pid = clone(pthread_start_thread, (void **) new_thread, - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | - __pthread_sig_cancel, new_thread); - saved_errno = errno; - } - /* Check if cloning succeeded */ - if (pid == -1) { - /******************************************************** - * Code inserted to remove the thread from our list of active - * threads in case of failure (needed to cope with uClinux), - * See comment below. */ - new_thread->p_nextlive->p_prevlive = new_thread->p_prevlive; - new_thread->p_prevlive->p_nextlive = new_thread->p_nextlive; - /********************************************************/ - - /* Free the stack if we allocated it */ - if (attr == NULL || !attr->__stackaddr_set) - { -#ifdef __ARCH_HAS_MMU__ - if (new_thread->p_guardsize != 0) - munmap(new_thread->p_guardaddr, new_thread->p_guardsize); - munmap((caddr_t)((char *)(new_thread+1) - INITIAL_STACK_SIZE), - INITIAL_STACK_SIZE); -#else - free(new_thread_bottom); -#endif /* __ARCH_HAS_MMU__ */ - } - __pthread_handles[sseg].h_descr = NULL; - __pthread_handles[sseg].h_bottom = NULL; - __pthread_handles_num--; - return errno; - } - PDEBUG("new thread pid = %d\n", pid); - -#if 0 - /* *********************************************************** - This code has been moved before the call to clone(). In uClinux, - the use of wait on a semaphore is dependant upon that the child so - the child must be in the active threads list. This list is used in - pthread_find_self() to get the pthread_descr of self. So, if the - child calls sem_wait before this code is executed , it will hang - forever and initial_thread will instead be posted by a sem_post - call. */ - - /* Insert new thread in doubly linked list of active threads */ - new_thread->p_prevlive = __pthread_main_thread; - new_thread->p_nextlive = __pthread_main_thread->p_nextlive; - __pthread_main_thread->p_nextlive->p_prevlive = new_thread; - __pthread_main_thread->p_nextlive = new_thread; - /************************************************************/ -#endif - - /* Set pid field of the new thread, in case we get there before the - child starts. */ - new_thread->p_pid = pid; - /* We're all set */ - *thread = new_thread_id; - return 0; -} - - -/* Try to free the resources of a thread when requested by pthread_join - or pthread_detach on a terminated thread. */ - -static void pthread_free(pthread_descr th) -{ - pthread_handle handle; - pthread_readlock_info *iter, *next; - char *h_bottom_save; - - ASSERT(th->p_exited); - /* Make the handle invalid */ - handle = thread_handle(th->p_tid); - __pthread_lock(&handle->h_lock, NULL); - h_bottom_save = handle->h_bottom; - handle->h_descr = NULL; - handle->h_bottom = (char *)(-1L); - __pthread_unlock(&handle->h_lock); -#ifdef FREE_THREAD_SELF - FREE_THREAD_SELF(th, th->p_nr); -#endif - /* One fewer threads in __pthread_handles */ - __pthread_handles_num--; - - /* Destroy read lock list, and list of free read lock structures. - If the former is not empty, it means the thread exited while - holding read locks! */ - - for (iter = th->p_readlock_list; iter != NULL; iter = next) - { - next = iter->pr_next; - free(iter); - } - - for (iter = th->p_readlock_free; iter != NULL; iter = next) - { - next = iter->pr_next; - free(iter); - } - - /* If initial thread, nothing to free */ - if (th == &__pthread_initial_thread) return; -#ifdef __ARCH_HAS_MMU__ - if (!th->p_userstack) - { - /* Free the stack and thread descriptor area */ - if (th->p_guardsize != 0) - munmap(th->p_guardaddr, th->p_guardsize); - munmap((caddr_t) ((char *)(th+1) - STACK_SIZE), STACK_SIZE); - } -#else - /* For non-MMU systems we always malloc the stack, so free it here. -StS */ - if (!th->p_userstack) { - free(h_bottom_save); - } -#endif /* __ARCH_HAS_MMU__ */ -} - -/* Handle threads that have exited */ - -static void pthread_exited(pid_t pid) -{ - pthread_descr th; - int detached; - /* Find thread with that pid */ - for (th = __pthread_main_thread->p_nextlive; - th != __pthread_main_thread; - th = th->p_nextlive) { - if (th->p_pid == pid) { - /* Remove thread from list of active threads */ - th->p_nextlive->p_prevlive = th->p_prevlive; - th->p_prevlive->p_nextlive = th->p_nextlive; - /* Mark thread as exited, and if detached, free its resources */ - __pthread_lock(th->p_lock, NULL); - th->p_exited = 1; - /* If we have to signal this event do it now. */ - if (th->p_report_events) - { - /* See whether TD_REAP is in any of the mask. */ - int idx = __td_eventword (TD_REAP); - uint32_t mask = __td_eventmask (TD_REAP); - - if ((mask & (__pthread_threads_events.event_bits[idx] - | th->p_eventbuf.eventmask.event_bits[idx])) != 0) - { - /* Yep, we have to signal the reapage. */ - th->p_eventbuf.eventnum = TD_REAP; - th->p_eventbuf.eventdata = th; - __pthread_last_event = th; - - /* Now call the function to signal the event. */ - __linuxthreads_reap_event(); - } - } - detached = th->p_detached; - __pthread_unlock(th->p_lock); - if (detached) - pthread_free(th); - break; - } - } - /* If all threads have exited and the main thread is pending on a - pthread_exit, wake up the main thread and terminate ourselves. */ - if (main_thread_exiting && - __pthread_main_thread->p_nextlive == __pthread_main_thread) { - restart(__pthread_main_thread); - /* Same logic as REQ_MAIN_THREAD_EXIT. */ - } -} - -static void pthread_reap_children(void) -{ - pid_t pid; - int status; - PDEBUG("\n"); - - while ((pid = __libc_waitpid(-1, &status, WNOHANG | __WCLONE)) > 0) { - pthread_exited(pid); - if (WIFSIGNALED(status)) { - /* If a thread died due to a signal, send the same signal to - all other threads, including the main thread. */ - pthread_kill_all_threads(WTERMSIG(status), 1); - _exit(0); - } - } -} - -/* Try to free the resources of a thread when requested by pthread_join - or pthread_detach on a terminated thread. */ - -static void pthread_handle_free(pthread_t th_id) -{ - pthread_handle handle = thread_handle(th_id); - pthread_descr th; - - __pthread_lock(&handle->h_lock, NULL); - if (invalid_handle(handle, th_id)) { - /* pthread_reap_children has deallocated the thread already, - nothing needs to be done */ - __pthread_unlock(&handle->h_lock); - return; - } - th = handle->h_descr; - if (th->p_exited) { - __pthread_unlock(&handle->h_lock); - pthread_free(th); - } else { - /* The Unix process of the thread is still running. - Mark the thread as detached so that the thread manager will - deallocate its resources when the Unix process exits. */ - th->p_detached = 1; - __pthread_unlock(&handle->h_lock); - } -} - -/* Send a signal to all running threads */ - -static void pthread_kill_all_threads(int sig, int main_thread_also) -{ - pthread_descr th; - for (th = __pthread_main_thread->p_nextlive; - th != __pthread_main_thread; - th = th->p_nextlive) { - kill(th->p_pid, sig); - } - if (main_thread_also) { - kill(__pthread_main_thread->p_pid, sig); - } -} - -/* Process-wide exit() */ - -static void pthread_handle_exit(pthread_descr issuing_thread, int exitcode) -{ - pthread_descr th; - __pthread_exit_requested = 1; - __pthread_exit_code = exitcode; - /* Send the CANCEL signal to all running threads, including the main - thread, but excluding the thread from which the exit request originated - (that thread must complete the exit, e.g. calling atexit functions - and flushing stdio buffers). */ - for (th = issuing_thread->p_nextlive; - th != issuing_thread; - th = th->p_nextlive) { - kill(th->p_pid, __pthread_sig_cancel); - } - /* Now, wait for all these threads, so that they don't become zombies - and their times are properly added to the thread manager's times. */ - for (th = issuing_thread->p_nextlive; - th != issuing_thread; - th = th->p_nextlive) { - waitpid(th->p_pid, NULL, __WCLONE); - } - restart(issuing_thread); - _exit(0); -} - -/* Handler for __pthread_sig_cancel in thread manager thread */ - -void __pthread_manager_sighandler(int sig) -{ - int kick_manager = terminated_children == 0 && main_thread_exiting; - terminated_children = 1; - - /* If the main thread is terminating, kick the thread manager loop - each time some threads terminate. This eliminates a two second - shutdown delay caused by the thread manager sleeping in the - call to __poll(). Instead, the thread manager is kicked into - action, reaps the outstanding threads and resumes the main thread - so that it can complete the shutdown. */ - - if (kick_manager) { - struct pthread_request request; - request.req_thread = 0; - request.req_kind = REQ_KICK; - TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request, - (char *) &request, sizeof(request))); - } -} - -/* Adjust priority of thread manager so that it always run at a priority - higher than all threads */ - -void __pthread_manager_adjust_prio(int thread_prio) -{ - struct sched_param param; - - if (thread_prio <= __pthread_manager_thread.p_priority) return; - param.sched_priority = - thread_prio < sched_get_priority_max(SCHED_FIFO) - ? thread_prio + 1 : thread_prio; - sched_setscheduler(__pthread_manager_thread.p_pid, SCHED_FIFO, ¶m); - __pthread_manager_thread.p_priority = thread_prio; -} diff --git a/libpthread/linuxthreads/mutex.c b/libpthread/linuxthreads/mutex.c deleted file mode 100644 index 7cc344fac..000000000 --- a/libpthread/linuxthreads/mutex.c +++ /dev/null @@ -1,356 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Mutexes */ - -#include <errno.h> -#include <sched.h> -#include <stddef.h> -#include <limits.h> -#include "pthread.h" -#include "internals.h" -#include "spinlock.h" -#include "queue.h" -#include "restart.h" - -int __pthread_mutex_init(pthread_mutex_t * mutex, - const pthread_mutexattr_t * mutex_attr) -{ - __pthread_init_lock(&mutex->__m_lock); - mutex->__m_kind = - mutex_attr == NULL ? PTHREAD_MUTEX_TIMED_NP : mutex_attr->__mutexkind; - mutex->__m_count = 0; - mutex->__m_owner = NULL; - return 0; -} -strong_alias (__pthread_mutex_init, pthread_mutex_init) - -int __pthread_mutex_destroy(pthread_mutex_t * mutex) -{ - switch (mutex->__m_kind) { - case PTHREAD_MUTEX_ADAPTIVE_NP: - case PTHREAD_MUTEX_RECURSIVE_NP: - if ((mutex->__m_lock.__status & 1) != 0) - return EBUSY; - return 0; - case PTHREAD_MUTEX_ERRORCHECK_NP: - case PTHREAD_MUTEX_TIMED_NP: - if (mutex->__m_lock.__status != 0) - return EBUSY; - return 0; - default: - return EINVAL; - } -} -strong_alias (__pthread_mutex_destroy, pthread_mutex_destroy) - -int __pthread_mutex_trylock(pthread_mutex_t * mutex) -{ - pthread_descr self; - int retcode; - - switch(mutex->__m_kind) { - case PTHREAD_MUTEX_ADAPTIVE_NP: - retcode = __pthread_trylock(&mutex->__m_lock); - return retcode; - case PTHREAD_MUTEX_RECURSIVE_NP: - self = thread_self(); - if (mutex->__m_owner == self) { - mutex->__m_count++; - return 0; - } - retcode = __pthread_trylock(&mutex->__m_lock); - if (retcode == 0) { - mutex->__m_owner = self; - mutex->__m_count = 0; - } - return retcode; - case PTHREAD_MUTEX_ERRORCHECK_NP: - retcode = __pthread_alt_trylock(&mutex->__m_lock); - if (retcode == 0) { - mutex->__m_owner = thread_self(); - } - return retcode; - case PTHREAD_MUTEX_TIMED_NP: - retcode = __pthread_alt_trylock(&mutex->__m_lock); - return retcode; - default: - return EINVAL; - } -} -strong_alias (__pthread_mutex_trylock, pthread_mutex_trylock) - -int __pthread_mutex_lock(pthread_mutex_t * mutex) -{ - pthread_descr self; - - switch(mutex->__m_kind) { - case PTHREAD_MUTEX_ADAPTIVE_NP: - __pthread_lock(&mutex->__m_lock, NULL); - return 0; - case PTHREAD_MUTEX_RECURSIVE_NP: - self = thread_self(); - if (mutex->__m_owner == self) { - mutex->__m_count++; - return 0; - } - __pthread_lock(&mutex->__m_lock, self); - mutex->__m_owner = self; - mutex->__m_count = 0; - return 0; - case PTHREAD_MUTEX_ERRORCHECK_NP: - self = thread_self(); - if (mutex->__m_owner == self) return EDEADLK; - __pthread_alt_lock(&mutex->__m_lock, self); - mutex->__m_owner = self; - return 0; - case PTHREAD_MUTEX_TIMED_NP: - __pthread_alt_lock(&mutex->__m_lock, NULL); - return 0; - default: - return EINVAL; - } -} -strong_alias (__pthread_mutex_lock, pthread_mutex_lock) - -int __pthread_mutex_timedlock (pthread_mutex_t *mutex, - const struct timespec *abstime) -{ - pthread_descr self; - int res; - - if (__builtin_expect (abstime->tv_nsec, 0) < 0 - || __builtin_expect (abstime->tv_nsec, 0) >= 1000000000) - return EINVAL; - - switch(mutex->__m_kind) { - case PTHREAD_MUTEX_ADAPTIVE_NP: - __pthread_lock(&mutex->__m_lock, NULL); - return 0; - case PTHREAD_MUTEX_RECURSIVE_NP: - self = thread_self(); - if (mutex->__m_owner == self) { - mutex->__m_count++; - return 0; - } - __pthread_lock(&mutex->__m_lock, self); - mutex->__m_owner = self; - mutex->__m_count = 0; - return 0; - case PTHREAD_MUTEX_ERRORCHECK_NP: - self = thread_self(); - if (mutex->__m_owner == self) return EDEADLK; - res = __pthread_alt_timedlock(&mutex->__m_lock, self, abstime); - if (res != 0) - { - mutex->__m_owner = self; - return 0; - } - return ETIMEDOUT; - case PTHREAD_MUTEX_TIMED_NP: - /* Only this type supports timed out lock. */ - return (__pthread_alt_timedlock(&mutex->__m_lock, NULL, abstime) - ? 0 : ETIMEDOUT); - default: - return EINVAL; - } -} -strong_alias (__pthread_mutex_timedlock, pthread_mutex_timedlock) - -int __pthread_mutex_unlock(pthread_mutex_t * mutex) -{ - switch (mutex->__m_kind) { - case PTHREAD_MUTEX_ADAPTIVE_NP: - __pthread_unlock(&mutex->__m_lock); - return 0; - case PTHREAD_MUTEX_RECURSIVE_NP: - if (mutex->__m_owner != thread_self()) - return EPERM; - if (mutex->__m_count > 0) { - mutex->__m_count--; - return 0; - } - mutex->__m_owner = NULL; - __pthread_unlock(&mutex->__m_lock); - return 0; - case PTHREAD_MUTEX_ERRORCHECK_NP: - if (mutex->__m_owner != thread_self() || mutex->__m_lock.__status == 0) - return EPERM; - mutex->__m_owner = NULL; - __pthread_alt_unlock(&mutex->__m_lock); - return 0; - case PTHREAD_MUTEX_TIMED_NP: - __pthread_alt_unlock(&mutex->__m_lock); - return 0; - default: - return EINVAL; - } -} -strong_alias (__pthread_mutex_unlock, pthread_mutex_unlock) - -int __pthread_mutexattr_init(pthread_mutexattr_t *attr) -{ - attr->__mutexkind = PTHREAD_MUTEX_TIMED_NP; - return 0; -} -strong_alias (__pthread_mutexattr_init, pthread_mutexattr_init) - -int __pthread_mutexattr_destroy(pthread_mutexattr_t *attr) -{ - return 0; -} -strong_alias (__pthread_mutexattr_destroy, pthread_mutexattr_destroy) - -int __pthread_mutexattr_settype(pthread_mutexattr_t *attr, int kind) -{ - if (kind != PTHREAD_MUTEX_ADAPTIVE_NP - && kind != PTHREAD_MUTEX_RECURSIVE_NP - && kind != PTHREAD_MUTEX_ERRORCHECK_NP - && kind != PTHREAD_MUTEX_TIMED_NP) - return EINVAL; - attr->__mutexkind = kind; - return 0; -} -weak_alias (__pthread_mutexattr_settype, pthread_mutexattr_settype) -strong_alias ( __pthread_mutexattr_settype, __pthread_mutexattr_setkind_np) -weak_alias (__pthread_mutexattr_setkind_np, pthread_mutexattr_setkind_np) - -int __pthread_mutexattr_gettype(const pthread_mutexattr_t *attr, int *kind) -{ - *kind = attr->__mutexkind; - return 0; -} -weak_alias (__pthread_mutexattr_gettype, pthread_mutexattr_gettype) -strong_alias (__pthread_mutexattr_gettype, __pthread_mutexattr_getkind_np) -weak_alias (__pthread_mutexattr_getkind_np, pthread_mutexattr_getkind_np) - -int __pthread_mutexattr_getpshared (const pthread_mutexattr_t *attr, - int *pshared) -{ - *pshared = PTHREAD_PROCESS_PRIVATE; - return 0; -} -weak_alias (__pthread_mutexattr_getpshared, pthread_mutexattr_getpshared) - -int __pthread_mutexattr_setpshared (pthread_mutexattr_t *attr, int pshared) -{ - if (pshared != PTHREAD_PROCESS_PRIVATE && pshared != PTHREAD_PROCESS_SHARED) - return EINVAL; - - /* For now it is not possible to shared a conditional variable. */ - if (pshared != PTHREAD_PROCESS_PRIVATE) - return ENOSYS; - - return 0; -} -weak_alias (__pthread_mutexattr_setpshared, pthread_mutexattr_setpshared) - -/* Once-only execution */ - -static pthread_mutex_t once_masterlock = PTHREAD_MUTEX_INITIALIZER; -static pthread_cond_t once_finished = PTHREAD_COND_INITIALIZER; -static int fork_generation = 0; /* Child process increments this after fork. */ - -enum { NEVER = 0, IN_PROGRESS = 1, DONE = 2 }; - -/* If a thread is canceled while calling the init_routine out of - pthread once, this handler will reset the once_control variable - to the NEVER state. */ - -static void pthread_once_cancelhandler(void *arg) -{ - pthread_once_t *once_control = arg; - - pthread_mutex_lock(&once_masterlock); - *once_control = NEVER; - pthread_mutex_unlock(&once_masterlock); - pthread_cond_broadcast(&once_finished); -} - -int __pthread_once(pthread_once_t * once_control, void (*init_routine)(void)) -{ - /* flag for doing the condition broadcast outside of mutex */ - int state_changed; - - /* Test without locking first for speed */ - if (*once_control == DONE) { - READ_MEMORY_BARRIER(); - return 0; - } - /* Lock and test again */ - - state_changed = 0; - - pthread_mutex_lock(&once_masterlock); - - /* If this object was left in an IN_PROGRESS state in a parent - process (indicated by stale generation field), reset it to NEVER. */ - if ((*once_control & 3) == IN_PROGRESS && (*once_control & ~3) != fork_generation) - *once_control = NEVER; - - /* If init_routine is being called from another routine, wait until - it completes. */ - while ((*once_control & 3) == IN_PROGRESS) { - pthread_cond_wait(&once_finished, &once_masterlock); - } - /* Here *once_control is stable and either NEVER or DONE. */ - if (*once_control == NEVER) { - *once_control = IN_PROGRESS | fork_generation; - pthread_mutex_unlock(&once_masterlock); - pthread_cleanup_push(pthread_once_cancelhandler, once_control); - init_routine(); - pthread_cleanup_pop(0); - pthread_mutex_lock(&once_masterlock); - WRITE_MEMORY_BARRIER(); - *once_control = DONE; - state_changed = 1; - } - pthread_mutex_unlock(&once_masterlock); - - if (state_changed) - pthread_cond_broadcast(&once_finished); - - return 0; -} -strong_alias (__pthread_once, pthread_once) - -/* - * Handle the state of the pthread_once mechanism across forks. The - * once_masterlock is acquired in the parent process prior to a fork to ensure - * that no thread is in the critical region protected by the lock. After the - * fork, the lock is released. In the child, the lock and the condition - * variable are simply reset. The child also increments its generation - * counter which lets pthread_once calls detect stale IN_PROGRESS states - * and reset them back to NEVER. - */ - -void __pthread_once_fork_prepare(void) -{ - pthread_mutex_lock(&once_masterlock); -} - -void __pthread_once_fork_parent(void) -{ - pthread_mutex_unlock(&once_masterlock); -} - -void __pthread_once_fork_child(void) -{ - pthread_mutex_init(&once_masterlock, NULL); - pthread_cond_init(&once_finished, NULL); - if (fork_generation <= INT_MAX - 4) - fork_generation += 4; /* leave least significant two bits zero */ - else - fork_generation = 0; -} diff --git a/libpthread/linuxthreads/oldsemaphore.c b/libpthread/linuxthreads/oldsemaphore.c deleted file mode 100644 index 3a3b3d186..000000000 --- a/libpthread/linuxthreads/oldsemaphore.c +++ /dev/null @@ -1,235 +0,0 @@ -/* - * This file contains the old semaphore code that we need to - * preserve for glibc-2.0 backwards compatibility. Port to glibc 2.1 - * done by Cristian Gafton. - */ - -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Semaphores a la POSIX 1003.1b */ - -#include <errno.h> -#include "pthread.h" -#include "internals.h" -#include "spinlock.h" -#include "restart.h" -#include "queue.h" - -typedef struct { - long int sem_status; - int sem_spinlock; -} old_sem_t; - -/* Maximum value the semaphore can have. */ -#define SEM_VALUE_MAX ((int) ((~0u) >> 1)) - -static inline int sem_compare_and_swap(old_sem_t *sem, long oldval, long newval) -{ - return compare_and_swap(&sem->sem_status, oldval, newval, &sem->sem_spinlock); -} - -/* The state of a semaphore is represented by a long int encoding - either the semaphore count if >= 0 and no thread is waiting on it, - or the head of the list of threads waiting for the semaphore. - To distinguish the two cases, we encode the semaphore count N - as 2N+1, so that it has the lowest bit set. - - A sequence of sem_wait operations on a semaphore initialized to N - result in the following successive states: - 2N+1, 2N-1, ..., 3, 1, &first_waiting_thread, &second_waiting_thread, ... -*/ - -static void sem_restart_list(pthread_descr waiting); - -int __old_sem_init(old_sem_t *sem, int pshared, unsigned int value) -{ - if (value > SEM_VALUE_MAX) { - errno = EINVAL; - return -1; - } - if (pshared) { - errno = ENOSYS; - return -1; - } - sem->sem_spinlock = 0; - sem->sem_status = ((long)value << 1) + 1; - return 0; -} - -/* Function called by pthread_cancel to remove the thread from - waiting inside __old_sem_wait. Here we simply unconditionally - indicate that the thread is to be woken, by returning 1. */ - -static int old_sem_extricate_func(void *obj, pthread_descr th) -{ - return 1; -} - -int __old_sem_wait(old_sem_t * sem) -{ - long oldstatus, newstatus; - volatile pthread_descr self = thread_self(); - pthread_descr * th; - pthread_extricate_if extr; - - /* Set up extrication interface */ - extr.pu_object = 0; - extr.pu_extricate_func = old_sem_extricate_func; - - while (1) { - /* Register extrication interface */ - __pthread_set_own_extricate_if(self, &extr); - do { - oldstatus = sem->sem_status; - if ((oldstatus & 1) && (oldstatus != 1)) - newstatus = oldstatus - 2; - else { - newstatus = (long) self; - self->p_nextwaiting = (pthread_descr) oldstatus; - } - } - while (! sem_compare_and_swap(sem, oldstatus, newstatus)); - if (newstatus & 1) { - /* We got the semaphore. */ - __pthread_set_own_extricate_if(self, 0); - return 0; - } - /* Wait for sem_post or cancellation */ - suspend(self); - __pthread_set_own_extricate_if(self, 0); - - /* This is a cancellation point */ - if (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE) { - /* Remove ourselves from the waiting list if we're still on it */ - /* First check if we're at the head of the list. */ - do { - oldstatus = sem->sem_status; - if (oldstatus != (long) self) break; - newstatus = (long) self->p_nextwaiting; - } - while (! sem_compare_and_swap(sem, oldstatus, newstatus)); - /* Now, check if we're somewhere in the list. - There's a race condition with sem_post here, but it does not matter: - the net result is that at the time pthread_exit is called, - self is no longer reachable from sem->sem_status. */ - if (oldstatus != (long) self && (oldstatus & 1) == 0) { - for (th = &(((pthread_descr) oldstatus)->p_nextwaiting); - *th != NULL && *th != (pthread_descr) 1; - th = &((*th)->p_nextwaiting)) { - if (*th == self) { - *th = self->p_nextwaiting; - break; - } - } - } - pthread_exit(PTHREAD_CANCELED); - } - } -} - -int __old_sem_trywait(old_sem_t * sem) -{ - long oldstatus, newstatus; - - do { - oldstatus = sem->sem_status; - if ((oldstatus & 1) == 0 || (oldstatus == 1)) { - errno = EAGAIN; - return -1; - } - newstatus = oldstatus - 2; - } - while (! sem_compare_and_swap(sem, oldstatus, newstatus)); - return 0; -} - -int __old_sem_post(old_sem_t * sem) -{ - long oldstatus, newstatus; - - do { - oldstatus = sem->sem_status; - if ((oldstatus & 1) == 0) - newstatus = 3; - else { - if (oldstatus >= SEM_VALUE_MAX) { - /* Overflow */ - errno = ERANGE; - return -1; - } - newstatus = oldstatus + 2; - } - } - while (! sem_compare_and_swap(sem, oldstatus, newstatus)); - if ((oldstatus & 1) == 0) - sem_restart_list((pthread_descr) oldstatus); - return 0; -} - -int __old_sem_getvalue(old_sem_t * sem, int * sval) -{ - long status = sem->sem_status; - if (status & 1) - *sval = (int)((unsigned long) status >> 1); - else - *sval = 0; - return 0; -} - -int __old_sem_destroy(old_sem_t * sem) -{ - if ((sem->sem_status & 1) == 0) { - errno = EBUSY; - return -1; - } - return 0; -} - -/* Auxiliary function for restarting all threads on a waiting list, - in priority order. */ - -static void sem_restart_list(pthread_descr waiting) -{ - pthread_descr th, towake, *p; - - /* Sort list of waiting threads by decreasing priority (insertion sort) */ - towake = NULL; - while (waiting != (pthread_descr) 1) { - th = waiting; - waiting = waiting->p_nextwaiting; - p = &towake; - while (*p != NULL && th->p_priority < (*p)->p_priority) - p = &((*p)->p_nextwaiting); - th->p_nextwaiting = *p; - *p = th; - } - /* Wake up threads in priority order */ - while (towake != NULL) { - th = towake; - towake = towake->p_nextwaiting; - th->p_nextwaiting = NULL; - restart(th); - } -} - -#if defined __PIC__ && defined DO_VERSIONING -symbol_version (__old_sem_init, sem_init, GLIBC_2.0); -symbol_version (__old_sem_wait, sem_wait, GLIBC_2.0); -symbol_version (__old_sem_trywait, sem_trywait, GLIBC_2.0); -symbol_version (__old_sem_post, sem_post, GLIBC_2.0); -symbol_version (__old_sem_getvalue, sem_getvalue, GLIBC_2.0); -symbol_version (__old_sem_destroy, sem_destroy, GLIBC_2.0); -#endif - diff --git a/libpthread/linuxthreads/pt-machine.c b/libpthread/linuxthreads/pt-machine.c deleted file mode 100644 index 438008d5d..000000000 --- a/libpthread/linuxthreads/pt-machine.c +++ /dev/null @@ -1,22 +0,0 @@ -/* "Instantiation of machine-dependent pthreads inline functions. - Copyright (C) 1998 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#define PT_EI - -#include <pt-machine.h> diff --git a/libpthread/linuxthreads/ptfork.c b/libpthread/linuxthreads/ptfork.c deleted file mode 100644 index eb544f34b..000000000 --- a/libpthread/linuxthreads/ptfork.c +++ /dev/null @@ -1,126 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* mods for uClibc: removed strong alias and defined funcs properly */ - -/* The "atfork" stuff */ - -#include <errno.h> - -#ifdef __ARCH_HAS_MMU__ - -#include <stddef.h> -#include <stdlib.h> -#include <unistd.h> -#include "pthread.h" -#include "internals.h" - -struct handler_list { - void (*handler)(void); - struct handler_list * next; -}; - -static pthread_mutex_t pthread_atfork_lock = PTHREAD_MUTEX_INITIALIZER; -static struct handler_list * pthread_atfork_prepare = NULL; -static struct handler_list * pthread_atfork_parent = NULL; -static struct handler_list * pthread_atfork_child = NULL; - -static void pthread_insert_list(struct handler_list ** list, - void (*handler)(void), - struct handler_list * newlist, - int at_end) -{ - if (handler == NULL) return; - if (at_end) { - while(*list != NULL) list = &((*list)->next); - } - newlist->handler = handler; - newlist->next = *list; - *list = newlist; -} - -struct handler_list_block { - struct handler_list prepare, parent, child; -}; - -int pthread_atfork(void (*prepare)(void), - void (*parent)(void), - void (*child)(void)) -{ - struct handler_list_block * block = - (struct handler_list_block *) malloc(sizeof(struct handler_list_block)); - if (block == NULL) return ENOMEM; - pthread_mutex_lock(&pthread_atfork_lock); - /* "prepare" handlers are called in LIFO */ - pthread_insert_list(&pthread_atfork_prepare, prepare, &block->prepare, 0); - /* "parent" handlers are called in FIFO */ - pthread_insert_list(&pthread_atfork_parent, parent, &block->parent, 1); - /* "child" handlers are called in FIFO */ - pthread_insert_list(&pthread_atfork_child, child, &block->child, 1); - pthread_mutex_unlock(&pthread_atfork_lock); - return 0; -} -//strong_alias (__pthread_atfork, pthread_atfork) - -static inline void pthread_call_handlers(struct handler_list * list) -{ - for (/*nothing*/; list != NULL; list = list->next) (list->handler)(); -} - -extern int __libc_fork(void); - -pid_t __fork(void) -{ - pid_t pid; - struct handler_list * prepare, * child, * parent; - - pthread_mutex_lock(&pthread_atfork_lock); - prepare = pthread_atfork_prepare; - child = pthread_atfork_child; - parent = pthread_atfork_parent; - pthread_mutex_unlock(&pthread_atfork_lock); - pthread_call_handlers(prepare); - pid = __libc_fork(); - if (pid == 0) { - __pthread_reset_main_thread(); - __fresetlockfiles(); - pthread_call_handlers(child); - } else { - pthread_call_handlers(parent); - } - return pid; -} -weak_alias (__fork, fork); - -pid_t __vfork(void) -{ - return __fork(); -} -weak_alias (__vfork, vfork); - -#else - -/* We can't support pthread_atfork without MMU, since we don't have - fork(), and we can't offer the correct semantics for vfork(). */ -int pthread_atfork(void (*prepare)(void), - void (*parent)(void), - void (*child)(void)) -{ - /* ENOMEM is probably pushing it a little bit. - Take it as `no *virtual* memory' :-) */ - errno = ENOMEM; - return -1; -} - -#endif diff --git a/libpthread/linuxthreads/pthread.c b/libpthread/linuxthreads/pthread.c deleted file mode 100644 index fed3d8c72..000000000 --- a/libpthread/linuxthreads/pthread.c +++ /dev/null @@ -1,1044 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Thread creation, initialization, and basic low-level routines */ - -#define __FORCE_GLIBC -#include <features.h> -#define __USE_GNU -#include <errno.h> -#include <netdb.h> /* for h_errno */ -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <fcntl.h> -#include <sys/wait.h> -#include <sys/resource.h> -#include "pthread.h" -#include "internals.h" -#include "spinlock.h" -#include "restart.h" -#include "debug.h" /* added to linuxthreads -StS */ - - -/* Mods for uClibc: Some includes */ -#include <signal.h> -#include <sys/types.h> -#include <sys/syscall.h> - -/* mods for uClibc: getpwd and getpagesize are the syscalls */ -#define __getpid getpid -#define __getpagesize getpagesize -/* mods for uClibc: __libc_sigaction is not in any standard headers */ -extern int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact); - - -/* These variables are used by the setup code. */ -extern int _errno; -extern int _h_errno; - - -/* Descriptor of the initial thread */ - -struct _pthread_descr_struct __pthread_initial_thread = { - &__pthread_initial_thread, /* pthread_descr p_nextlive */ - &__pthread_initial_thread, /* pthread_descr p_prevlive */ - NULL, /* pthread_descr p_nextwaiting */ - NULL, /* pthread_descr p_nextlock */ - PTHREAD_THREADS_MAX, /* pthread_t p_tid */ - 0, /* int p_pid */ - 0, /* int p_priority */ - &__pthread_handles[0].h_lock, /* struct _pthread_fastlock * p_lock */ - 0, /* int p_signal */ - NULL, /* sigjmp_buf * p_signal_buf */ - NULL, /* sigjmp_buf * p_cancel_buf */ - 0, /* char p_terminated */ - 0, /* char p_detached */ - 0, /* char p_exited */ - NULL, /* void * p_retval */ - 0, /* int p_retval */ - NULL, /* pthread_descr p_joining */ - NULL, /* struct _pthread_cleanup_buffer * p_cleanup */ - 0, /* char p_cancelstate */ - 0, /* char p_canceltype */ - 0, /* char p_canceled */ - &_errno, /* int *p_errnop */ - 0, /* int p_errno */ - &_h_errno, /* int *p_h_errnop */ - 0, /* int p_h_errno */ - NULL, /* char * p_in_sighandler */ - 0, /* char p_sigwaiting */ - PTHREAD_START_ARGS_INITIALIZER, /* struct pthread_start_args p_start_args */ - {NULL}, /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */ - {NULL}, /* void * p_libc_specific[_LIBC_TSD_KEY_N] */ - 0, /* int p_userstack */ - NULL, /* void * p_guardaddr */ - 0, /* size_t p_guardsize */ - &__pthread_initial_thread, /* pthread_descr p_self */ - 0, /* Always index 0 */ - 0, /* int p_report_events */ - {{{0, }}, 0, NULL}, /* td_eventbuf_t p_eventbuf */ - __ATOMIC_INITIALIZER, /* struct pthread_atomic p_resume_count */ - 0, /* char p_woken_by_cancel */ - 0, /* char p_condvar_avail */ - 0, /* char p_sem_avail */ - NULL, /* struct pthread_extricate_if *p_extricate */ - NULL, /* pthread_readlock_info *p_readlock_list; */ - NULL, /* pthread_readlock_info *p_readlock_free; */ - 0 /* int p_untracked_readlock_count; */ -#ifdef __UCLIBC_HAS_XLOCALE__ - , - &__global_locale_data, /* __locale_t locale; */ -#endif /* __UCLIBC_HAS_XLOCALE__ */ -}; - -/* Descriptor of the manager thread; none of this is used but the error - variables, the p_pid and p_priority fields, - and the address for identification. */ -#define manager_thread (&__pthread_manager_thread) -struct _pthread_descr_struct __pthread_manager_thread = { - NULL, /* pthread_descr p_nextlive */ - NULL, /* pthread_descr p_prevlive */ - NULL, /* pthread_descr p_nextwaiting */ - NULL, /* pthread_descr p_nextlock */ - 0, /* int p_tid */ - 0, /* int p_pid */ - 0, /* int p_priority */ - &__pthread_handles[1].h_lock, /* struct _pthread_fastlock * p_lock */ - 0, /* int p_signal */ - NULL, /* sigjmp_buf * p_signal_buf */ - NULL, /* sigjmp_buf * p_cancel_buf */ - 0, /* char p_terminated */ - 0, /* char p_detached */ - 0, /* char p_exited */ - NULL, /* void * p_retval */ - 0, /* int p_retval */ - NULL, /* pthread_descr p_joining */ - NULL, /* struct _pthread_cleanup_buffer * p_cleanup */ - 0, /* char p_cancelstate */ - 0, /* char p_canceltype */ - 0, /* char p_canceled */ - &__pthread_manager_thread.p_errno, /* int *p_errnop */ - 0, /* int p_errno */ - NULL, /* int *p_h_errnop */ - 0, /* int p_h_errno */ - NULL, /* char * p_in_sighandler */ - 0, /* char p_sigwaiting */ - PTHREAD_START_ARGS_INITIALIZER, /* struct pthread_start_args p_start_args */ - {NULL}, /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */ - {NULL}, /* void * p_libc_specific[_LIBC_TSD_KEY_N] */ - 0, /* int p_userstack */ - NULL, /* void * p_guardaddr */ - 0, /* size_t p_guardsize */ - &__pthread_manager_thread, /* pthread_descr p_self */ - 1, /* Always index 1 */ - 0, /* int p_report_events */ - {{{0, }}, 0, NULL}, /* td_eventbuf_t p_eventbuf */ - __ATOMIC_INITIALIZER, /* struct pthread_atomic p_resume_count */ - 0, /* char p_woken_by_cancel */ - 0, /* char p_condvar_avail */ - 0, /* char p_sem_avail */ - NULL, /* struct pthread_extricate_if *p_extricate */ - NULL, /* pthread_readlock_info *p_readlock_list; */ - NULL, /* pthread_readlock_info *p_readlock_free; */ - 0 /* int p_untracked_readlock_count; */ -#ifdef __UCLIBC_HAS_XLOCALE__ - , - &__global_locale_data, /* __locale_t locale; */ -#endif /* __UCLIBC_HAS_XLOCALE__ */ -}; - -/* Pointer to the main thread (the father of the thread manager thread) */ -/* Originally, this is the initial thread, but this changes after fork() */ - -pthread_descr __pthread_main_thread = &__pthread_initial_thread; - -/* Limit between the stack of the initial thread (above) and the - stacks of other threads (below). Aligned on a STACK_SIZE boundary. */ - -char *__pthread_initial_thread_bos = NULL; - -/* For non-MMU systems also remember to stack top of the initial thread. - * This is adapted when other stacks are malloc'ed since we don't know - * the bounds a-priori. -StS */ - -#ifndef __ARCH_HAS_MMU__ -char *__pthread_initial_thread_tos = NULL; -#endif /* __ARCH_HAS_MMU__ */ - -/* File descriptor for sending requests to the thread manager. */ -/* Initially -1, meaning that the thread manager is not running. */ - -int __pthread_manager_request = -1; - -/* Other end of the pipe for sending requests to the thread manager. */ - -int __pthread_manager_reader; - -/* Limits of the thread manager stack */ - -char *__pthread_manager_thread_bos = NULL; -char *__pthread_manager_thread_tos = NULL; - -/* For process-wide exit() */ - -int __pthread_exit_requested = 0; -int __pthread_exit_code = 0; - -/* Communicate relevant LinuxThreads constants to gdb */ - -const int __pthread_threads_max = PTHREAD_THREADS_MAX; -const int __pthread_sizeof_handle = sizeof(struct pthread_handle_struct); -const int __pthread_offsetof_descr = offsetof(struct pthread_handle_struct, h_descr); -const int __pthread_offsetof_pid = offsetof(struct _pthread_descr_struct, - p_pid); -const int __linuxthreads_pthread_sizeof_descr - = sizeof(struct _pthread_descr_struct); - -const int __linuxthreads_initial_report_events; - -const char __linuxthreads_version[] = VERSION; - -/* Forward declarations */ -static void pthread_onexit_process(int retcode, void *arg); -static void pthread_handle_sigcancel(int sig); -static void pthread_handle_sigrestart(int sig); -static void pthread_handle_sigdebug(int sig); -int __pthread_timedsuspend_new(pthread_descr self, const struct timespec *abstime); - -/* Signal numbers used for the communication. - In these variables we keep track of the used variables. If the - platform does not support any real-time signals we will define the - values to some unreasonable value which will signal failing of all - the functions below. */ -#ifndef __NR_rt_sigaction -static int current_rtmin = -1; -static int current_rtmax = -1; -int __pthread_sig_restart = SIGUSR1; -int __pthread_sig_cancel = SIGUSR2; -int __pthread_sig_debug; -#else - -#if __SIGRTMAX - __SIGRTMIN >= 3 -static int current_rtmin = __SIGRTMIN + 3; -static int current_rtmax = __SIGRTMAX; -int __pthread_sig_restart = __SIGRTMIN; -int __pthread_sig_cancel = __SIGRTMIN + 1; -int __pthread_sig_debug = __SIGRTMIN + 2; -void (*__pthread_restart)(pthread_descr) = __pthread_restart_new; -void (*__pthread_suspend)(pthread_descr) = __pthread_wait_for_restart_signal; -int (*__pthread_timedsuspend)(pthread_descr, const struct timespec *) = __pthread_timedsuspend_new; -#else -static int current_rtmin = __SIGRTMIN; -static int current_rtmax = __SIGRTMAX; -int __pthread_sig_restart = SIGUSR1; -int __pthread_sig_cancel = SIGUSR2; -int __pthread_sig_debug; -void (*__pthread_restart)(pthread_descr) = __pthread_restart_old; -void (*__pthread_suspend)(pthread_descr) = __pthread_suspend_old; -int (*__pthread_timedsuspend)(pthread_descr, const struct timespec *) = __pthread_timedsuspend_old; - -#endif - -/* Return number of available real-time signal with highest priority. */ -int __libc_current_sigrtmin (void) -{ - return current_rtmin; -} - -/* Return number of available real-time signal with lowest priority. */ -int __libc_current_sigrtmax (void) -{ - return current_rtmax; -} - -/* Allocate real-time signal with highest/lowest available - priority. Please note that we don't use a lock since we assume - this function to be called at program start. */ -int __libc_allocate_rtsig (int high) -{ - if (current_rtmin == -1 || current_rtmin > current_rtmax) - /* We don't have anymore signal available. */ - return -1; - return high ? current_rtmin++ : current_rtmax--; -} -#endif - -/* Initialize the pthread library. - Initialization is split in two functions: - - a constructor function that blocks the __pthread_sig_restart signal - (must do this very early, since the program could capture the signal - mask with e.g. sigsetjmp before creating the first thread); - - a regular function called from pthread_create when needed. */ - -static void pthread_initialize(void) __attribute__((constructor)); - - /* Do some minimal initialization which has to be done during the - startup of the C library. */ -void __pthread_initialize_minimal(void) -{ - /* If we have special thread_self processing, initialize - * that for the main thread now. */ -#ifdef INIT_THREAD_SELF - INIT_THREAD_SELF(&__pthread_initial_thread, 0); -#endif -} - - -static void pthread_initialize(void) -{ - struct sigaction sa; - sigset_t mask; - struct rlimit limit; - int max_stack; - - /* If already done (e.g. by a constructor called earlier!), bail out */ - if (__pthread_initial_thread_bos != NULL) return; -#ifdef TEST_FOR_COMPARE_AND_SWAP - /* Test if compare-and-swap is available */ - __pthread_has_cas = compare_and_swap_is_available(); -#endif - /* For the initial stack, reserve at least STACK_SIZE bytes of stack - below the current stack address, and align that on a - STACK_SIZE boundary. */ - __pthread_initial_thread_bos = - (char *)(((long)CURRENT_STACK_FRAME - 2 * STACK_SIZE) & ~(STACK_SIZE - 1)); - /* Update the descriptor for the initial thread. */ - __pthread_initial_thread.p_pid = __getpid(); - /* If we have special thread_self processing, initialize that for the - main thread now. */ -#ifdef INIT_THREAD_SELF - INIT_THREAD_SELF(&__pthread_initial_thread, 0); -#endif - /* The errno/h_errno variable of the main thread are the global ones. */ - __pthread_initial_thread.p_errnop = &_errno; - __pthread_initial_thread.p_h_errnop = &_h_errno; - -#ifdef __UCLIBC_HAS_XLOCALE__ - /* The locale of the main thread is the current locale in use. */ - __pthread_initial_thread.locale = __curlocale_var; -#endif /* __UCLIBC_HAS_XLOCALE__ */ - - { /* uClibc-specific stdio initialization for threads. */ - FILE *fp; - - _stdio_user_locking = 0; /* 2 if threading not initialized */ - for (fp = _stdio_openlist; fp != NULL; fp = fp->__nextopen) { - if (fp->__user_locking != 1) { - fp->__user_locking = 0; - } - } - } - - /* Play with the stack size limit to make sure that no stack ever grows - beyond STACK_SIZE minus two pages (one page for the thread descriptor - immediately beyond, and one page to act as a guard page). */ - -#ifdef __ARCH_HAS_MMU__ - /* We cannot allocate a huge chunk of memory to mmap all thread stacks later - * on a non-MMU system. Thus, we don't need the rlimit either. -StS */ - getrlimit(RLIMIT_STACK, &limit); - max_stack = STACK_SIZE - 2 * __getpagesize(); - if (limit.rlim_cur > max_stack) { - limit.rlim_cur = max_stack; - setrlimit(RLIMIT_STACK, &limit); - } -#else - /* For non-MMU assume __pthread_initial_thread_tos at upper page boundary, and - * __pthread_initial_thread_bos at address 0. These bounds are refined as we - * malloc other stack frames such that they don't overlap. -StS - */ - __pthread_initial_thread_tos = - (char *)(((long)CURRENT_STACK_FRAME + __getpagesize()) & ~(__getpagesize() - 1)); - __pthread_initial_thread_bos = (char *) 1; /* set it non-zero so we know we have been here */ - PDEBUG("initial thread stack bounds: bos=%p, tos=%p\n", - __pthread_initial_thread_bos, __pthread_initial_thread_tos); -#endif /* __ARCH_HAS_MMU__ */ - - /* Setup signal handlers for the initial thread. - Since signal handlers are shared between threads, these settings - will be inherited by all other threads. */ - sa.sa_handler = pthread_handle_sigrestart; - sigemptyset(&sa.sa_mask); - sa.sa_flags = 0; - __libc_sigaction(__pthread_sig_restart, &sa, NULL); - sa.sa_handler = pthread_handle_sigcancel; - sigaddset(&sa.sa_mask, __pthread_sig_restart); - // sa.sa_flags = 0; - __libc_sigaction(__pthread_sig_cancel, &sa, NULL); - if (__pthread_sig_debug > 0) { - sa.sa_handler = pthread_handle_sigdebug; - sigemptyset(&sa.sa_mask); - // sa.sa_flags = 0; - __libc_sigaction(__pthread_sig_debug, &sa, NULL); - } - /* Initially, block __pthread_sig_restart. Will be unblocked on demand. */ - sigemptyset(&mask); - sigaddset(&mask, __pthread_sig_restart); - sigprocmask(SIG_BLOCK, &mask, NULL); - /* And unblock __pthread_sig_cancel if it has been blocked. */ - sigdelset(&mask, __pthread_sig_restart); - sigaddset(&mask, __pthread_sig_cancel); - sigprocmask(SIG_UNBLOCK, &mask, NULL); - /* Register an exit function to kill all other threads. */ - /* Do it early so that user-registered atexit functions are called - before pthread_onexit_process. */ - on_exit(pthread_onexit_process, NULL); -} - -void __pthread_initialize(void) -{ - pthread_initialize(); -} - -int __pthread_initialize_manager(void) -{ - int manager_pipe[2]; - int pid; - int report_events; - struct pthread_request request; - - /* If basic initialization not done yet (e.g. we're called from a - constructor run before our constructor), do it now */ - if (__pthread_initial_thread_bos == NULL) pthread_initialize(); - /* Setup stack for thread manager */ - __pthread_manager_thread_bos = malloc(THREAD_MANAGER_STACK_SIZE); - if (__pthread_manager_thread_bos == NULL) return -1; - __pthread_manager_thread_tos = - __pthread_manager_thread_bos + THREAD_MANAGER_STACK_SIZE; - - /* On non-MMU systems we make sure that the initial thread bounds don't overlap - * with the manager stack frame */ - NOMMU_INITIAL_THREAD_BOUNDS(__pthread_manager_thread_tos,__pthread_manager_thread_bos); - PDEBUG("manager stack: size=%d, bos=%p, tos=%p\n", THREAD_MANAGER_STACK_SIZE, - __pthread_manager_thread_bos, __pthread_manager_thread_tos); -#if 0 - PDEBUG("initial stack: estimate bos=%p, tos=%p\n", - __pthread_initial_thread_bos, __pthread_initial_thread_tos); -#endif - - /* Setup pipe to communicate with thread manager */ - if (pipe(manager_pipe) == -1) { - free(__pthread_manager_thread_bos); - return -1; - } - /* Start the thread manager */ - pid = 0; -#ifdef USE_TLS - if (__linuxthreads_initial_report_events != 0) - THREAD_SETMEM (((pthread_descr) NULL), p_report_events, - __linuxthreads_initial_report_events); - report_events = THREAD_GETMEM (((pthread_descr) NULL), p_report_events); -#else - if (__linuxthreads_initial_report_events != 0) - __pthread_initial_thread.p_report_events - = __linuxthreads_initial_report_events; - report_events = __pthread_initial_thread.p_report_events; -#endif - if (__builtin_expect (report_events, 0)) - { - /* It's a bit more complicated. We have to report the creation of - the manager thread. */ - int idx = __td_eventword (TD_CREATE); - uint32_t mask = __td_eventmask (TD_CREATE); - - if ((mask & (__pthread_threads_events.event_bits[idx] - | __pthread_initial_thread.p_eventbuf.eventmask.event_bits[idx])) - != 0) - { - - __pthread_lock(__pthread_manager_thread.p_lock, NULL); - - pid = clone(__pthread_manager_event, - (void **) __pthread_manager_thread_tos, - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND, - (void *)(long)manager_pipe[0]); - - if (pid != -1) - { - /* Now fill in the information about the new thread in - the newly created thread's data structure. We cannot let - the new thread do this since we don't know whether it was - already scheduled when we send the event. */ - __pthread_manager_thread.p_eventbuf.eventdata = - &__pthread_manager_thread; - __pthread_manager_thread.p_eventbuf.eventnum = TD_CREATE; - __pthread_last_event = &__pthread_manager_thread; - __pthread_manager_thread.p_tid = 2* PTHREAD_THREADS_MAX + 1; - __pthread_manager_thread.p_pid = pid; - - /* Now call the function which signals the event. */ - __linuxthreads_create_event (); - } - /* Now restart the thread. */ - __pthread_unlock(__pthread_manager_thread.p_lock); - } - } - - if (pid == 0) { - pid = clone(__pthread_manager, (void **) __pthread_manager_thread_tos, - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND, - (void *)(long)manager_pipe[0]); - } - if (pid == -1) { - free(__pthread_manager_thread_bos); - __libc_close(manager_pipe[0]); - __libc_close(manager_pipe[1]); - return -1; - } - __pthread_manager_request = manager_pipe[1]; /* writing end */ - __pthread_manager_reader = manager_pipe[0]; /* reading end */ - __pthread_manager_thread.p_tid = 2* PTHREAD_THREADS_MAX + 1; - __pthread_manager_thread.p_pid = pid; - - /* Make gdb aware of new thread manager */ - if (__pthread_threads_debug && __pthread_sig_debug > 0) - { - raise(__pthread_sig_debug); - /* We suspend ourself and gdb will wake us up when it is - ready to handle us. */ - __pthread_wait_for_restart_signal(thread_self()); - } - /* Synchronize debugging of the thread manager */ - PDEBUG("send REQ_DEBUG to manager thread\n"); - request.req_kind = REQ_DEBUG; - TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request, - (char *) &request, sizeof(request))); - return 0; -} - -/* Thread creation */ - -int pthread_create(pthread_t *thread, const pthread_attr_t *attr, - void * (*start_routine)(void *), void *arg) -{ - pthread_descr self = thread_self(); - struct pthread_request request; - if (__pthread_manager_request < 0) { - if (__pthread_initialize_manager() < 0) return EAGAIN; - } - request.req_thread = self; - request.req_kind = REQ_CREATE; - request.req_args.create.attr = attr; - request.req_args.create.fn = start_routine; - request.req_args.create.arg = arg; - sigprocmask(SIG_SETMASK, (const sigset_t *) NULL, - &request.req_args.create.mask); - PDEBUG("write REQ_CREATE to manager thread\n"); - TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request, - (char *) &request, sizeof(request))); - PDEBUG("before suspend(self)\n"); - suspend(self); - PDEBUG("after suspend(self)\n"); - if (THREAD_GETMEM(self, p_retcode) == 0) - *thread = (pthread_t) THREAD_GETMEM(self, p_retval); - return THREAD_GETMEM(self, p_retcode); -} - -/* Simple operations on thread identifiers */ - -pthread_t pthread_self(void) -{ - pthread_descr self = thread_self(); - return THREAD_GETMEM(self, p_tid); -} - -int pthread_equal(pthread_t thread1, pthread_t thread2) -{ - return thread1 == thread2; -} - -/* Helper function for thread_self in the case of user-provided stacks */ - -#ifndef THREAD_SELF - -pthread_descr __pthread_find_self() -{ - char * sp = CURRENT_STACK_FRAME; - pthread_handle h; - - /* __pthread_handles[0] is the initial thread, __pthread_handles[1] is - the manager threads handled specially in thread_self(), so start at 2 */ - h = __pthread_handles + 2; - while (! (sp <= (char *) h->h_descr && sp >= h->h_bottom)) h++; - -#ifdef DEBUG_PT - if (h->h_descr == NULL) { - printf("*** %s ERROR descriptor is NULL!!!!! ***\n\n", __FUNCTION__); - _exit(1); - } -#endif - - return h->h_descr; -} -#else - -static pthread_descr thread_self_stack(void) -{ - char *sp = CURRENT_STACK_FRAME; - pthread_handle h; - - if (sp >= __pthread_manager_thread_bos && sp < __pthread_manager_thread_tos) - return manager_thread; - h = __pthread_handles + 2; -# ifdef USE_TLS - while (h->h_descr == NULL - || ! (sp <= (char *) h->h_descr->p_stackaddr && sp >= h->h_bottom)) - h++; -# else - while (! (sp <= (char *) h->h_descr && sp >= h->h_bottom)) - h++; -# endif - return h->h_descr; -} - -#endif - -/* Thread scheduling */ - -int pthread_setschedparam(pthread_t thread, int policy, - const struct sched_param *param) -{ - pthread_handle handle = thread_handle(thread); - pthread_descr th; - - __pthread_lock(&handle->h_lock, NULL); - if (invalid_handle(handle, thread)) { - __pthread_unlock(&handle->h_lock); - return ESRCH; - } - th = handle->h_descr; - if (sched_setscheduler(th->p_pid, policy, param) == -1) { - __pthread_unlock(&handle->h_lock); - return errno; - } - th->p_priority = policy == SCHED_OTHER ? 0 : param->sched_priority; - __pthread_unlock(&handle->h_lock); - if (__pthread_manager_request >= 0) - __pthread_manager_adjust_prio(th->p_priority); - return 0; -} - -int pthread_getschedparam(pthread_t thread, int *policy, - struct sched_param *param) -{ - pthread_handle handle = thread_handle(thread); - int pid, pol; - - __pthread_lock(&handle->h_lock, NULL); - if (invalid_handle(handle, thread)) { - __pthread_unlock(&handle->h_lock); - return ESRCH; - } - pid = handle->h_descr->p_pid; - __pthread_unlock(&handle->h_lock); - pol = sched_getscheduler(pid); - if (pol == -1) return errno; - if (sched_getparam(pid, param) == -1) return errno; - *policy = pol; - return 0; -} - -/* Process-wide exit() request */ - -static void pthread_onexit_process(int retcode, void *arg) -{ - struct pthread_request request; - pthread_descr self = thread_self(); - - if (__pthread_manager_request >= 0) { - request.req_thread = self; - request.req_kind = REQ_PROCESS_EXIT; - request.req_args.exit.code = retcode; - TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request, - (char *) &request, sizeof(request))); - suspend(self); - /* Main thread should accumulate times for thread manager and its - children, so that timings for main thread account for all threads. */ - if (self == __pthread_main_thread) { - waitpid(__pthread_manager_thread.p_pid, NULL, __WCLONE); - /* Since all threads have been asynchronously terminated - * (possibly holding locks), free cannot be used any more. */ - __pthread_manager_thread_bos = __pthread_manager_thread_tos = NULL; - } - } -} - -/* The handler for the RESTART signal just records the signal received - in the thread descriptor, and optionally performs a siglongjmp - (for pthread_cond_timedwait). */ - -static void pthread_handle_sigrestart(int sig) -{ - pthread_descr self = thread_self(); - THREAD_SETMEM(self, p_signal, sig); - if (THREAD_GETMEM(self, p_signal_jmp) != NULL) - siglongjmp(*THREAD_GETMEM(self, p_signal_jmp), 1); -} - -/* The handler for the CANCEL signal checks for cancellation - (in asynchronous mode), for process-wide exit and exec requests. - For the thread manager thread, redirect the signal to - __pthread_manager_sighandler. */ - -static void pthread_handle_sigcancel(int sig) -{ - pthread_descr self = thread_self(); - sigjmp_buf * jmpbuf; - - - if (self == &__pthread_manager_thread) - { -#ifdef THREAD_SELF - /* A new thread might get a cancel signal before it is fully - initialized, so that the thread register might still point to the - manager thread. Double check that this is really the manager - thread. */ - pthread_descr real_self = thread_self_stack(); - if (real_self == &__pthread_manager_thread) - { - __pthread_manager_sighandler(sig); - return; - } - /* Oops, thread_self() isn't working yet.. */ - self = real_self; -# ifdef INIT_THREAD_SELF - INIT_THREAD_SELF(self, self->p_nr); -# endif -#else - __pthread_manager_sighandler(sig); - return; -#endif - } - if (__builtin_expect (__pthread_exit_requested, 0)) { - /* Main thread should accumulate times for thread manager and its - children, so that timings for main thread account for all threads. */ - if (self == __pthread_main_thread) { -#ifdef USE_TLS - waitpid(__pthread_manager_thread->p_pid, NULL, __WCLONE); -#else - waitpid(__pthread_manager_thread.p_pid, NULL, __WCLONE); -#endif - } - _exit(__pthread_exit_code); - } - if (__builtin_expect (THREAD_GETMEM(self, p_canceled), 0) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) { - if (THREAD_GETMEM(self, p_canceltype) == PTHREAD_CANCEL_ASYNCHRONOUS) - pthread_exit(PTHREAD_CANCELED); - jmpbuf = THREAD_GETMEM(self, p_cancel_jmp); - if (jmpbuf != NULL) { - THREAD_SETMEM(self, p_cancel_jmp, NULL); - siglongjmp(*jmpbuf, 1); - } - } -} - -/* Handler for the DEBUG signal. - The debugging strategy is as follows: - On reception of a REQ_DEBUG request (sent by new threads created to - the thread manager under debugging mode), the thread manager throws - __pthread_sig_debug to itself. The debugger (if active) intercepts - this signal, takes into account new threads and continue execution - of the thread manager by propagating the signal because it doesn't - know what it is specifically done for. In the current implementation, - the thread manager simply discards it. */ - -static void pthread_handle_sigdebug(int sig) -{ - /* Nothing */ -} - -/* Reset the state of the thread machinery after a fork(). - Close the pipe used for requests and set the main thread to the forked - thread. - Notice that we can't free the stack segments, as the forked thread - may hold pointers into them. */ - -void __pthread_reset_main_thread() -{ - pthread_descr self = thread_self(); - - if (__pthread_manager_request != -1) { - /* Free the thread manager stack */ - free(__pthread_manager_thread_bos); - __pthread_manager_thread_bos = __pthread_manager_thread_tos = NULL; - /* Close the two ends of the pipe */ - __libc_close(__pthread_manager_request); - __libc_close(__pthread_manager_reader); - __pthread_manager_request = __pthread_manager_reader = -1; - } - - /* Update the pid of the main thread */ - THREAD_SETMEM(self, p_pid, __getpid()); - /* Make the forked thread the main thread */ - __pthread_main_thread = self; - THREAD_SETMEM(self, p_nextlive, self); - THREAD_SETMEM(self, p_prevlive, self); - /* Now this thread modifies the global variables. */ - THREAD_SETMEM(self, p_errnop, &_errno); - THREAD_SETMEM(self, p_h_errnop, &_h_errno); -} - -/* Process-wide exec() request */ - -void __pthread_kill_other_threads_np(void) -{ - struct sigaction sa; - /* Terminate all other threads and thread manager */ - pthread_onexit_process(0, NULL); - /* Make current thread the main thread in case the calling thread - changes its mind, does not exec(), and creates new threads instead. */ - __pthread_reset_main_thread(); - /* Reset the signal handlers behaviour for the signals the - implementation uses since this would be passed to the new - process. */ - sigemptyset(&sa.sa_mask); - sa.sa_flags = 0; - sa.sa_handler = SIG_DFL; - __libc_sigaction(__pthread_sig_restart, &sa, NULL); - __libc_sigaction(__pthread_sig_cancel, &sa, NULL); - if (__pthread_sig_debug > 0) - __libc_sigaction(__pthread_sig_debug, &sa, NULL); -} -weak_alias (__pthread_kill_other_threads_np, pthread_kill_other_threads_np) - -/* Concurrency symbol level. */ -static int current_level; - -int __pthread_setconcurrency(int level) -{ - /* We don't do anything unless we have found a useful interpretation. */ - current_level = level; - return 0; -} -weak_alias (__pthread_setconcurrency, pthread_setconcurrency) - -int __pthread_getconcurrency(void) -{ - return current_level; -} -weak_alias (__pthread_getconcurrency, pthread_getconcurrency) - - -/* Primitives for controlling thread execution */ - -void __pthread_wait_for_restart_signal(pthread_descr self) -{ - sigset_t mask; - - sigprocmask(SIG_SETMASK, NULL, &mask); /* Get current signal mask */ - sigdelset(&mask, __pthread_sig_restart); /* Unblock the restart signal */ - THREAD_SETMEM(self, p_signal, 0); - do { - sigsuspend(&mask); /* Wait for signal */ - } while (THREAD_GETMEM(self, p_signal) !=__pthread_sig_restart); - - READ_MEMORY_BARRIER(); /* See comment in __pthread_restart_new */ -} - -#ifndef __NR_rt_sigaction -/* The _old variants are for 2.0 and early 2.1 kernels which don't have RT - signals. - On these kernels, we use SIGUSR1 and SIGUSR2 for restart and cancellation. - Since the restart signal does not queue, we use an atomic counter to create - queuing semantics. This is needed to resolve a rare race condition in - pthread_cond_timedwait_relative. */ - -void __pthread_restart_old(pthread_descr th) -{ - if (atomic_increment(&th->p_resume_count) == -1) - kill(th->p_pid, __pthread_sig_restart); -} - -void __pthread_suspend_old(pthread_descr self) -{ - if (atomic_decrement(&self->p_resume_count) <= 0) - __pthread_wait_for_restart_signal(self); -} - -int -__pthread_timedsuspend_old(pthread_descr self, const struct timespec *abstime) -{ - sigset_t unblock, initial_mask; - int was_signalled = 0; - sigjmp_buf jmpbuf; - - if (atomic_decrement(&self->p_resume_count) == 0) { - /* Set up a longjmp handler for the restart signal, unblock - the signal and sleep. */ - - if (sigsetjmp(jmpbuf, 1) == 0) { - THREAD_SETMEM(self, p_signal_jmp, &jmpbuf); - THREAD_SETMEM(self, p_signal, 0); - /* Unblock the restart signal */ - sigemptyset(&unblock); - sigaddset(&unblock, __pthread_sig_restart); - sigprocmask(SIG_UNBLOCK, &unblock, &initial_mask); - - while (1) { - struct timeval now; - struct timespec reltime; - - /* Compute a time offset relative to now. */ - __gettimeofday (&now, NULL); - reltime.tv_nsec = abstime->tv_nsec - now.tv_usec * 1000; - reltime.tv_sec = abstime->tv_sec - now.tv_sec; - if (reltime.tv_nsec < 0) { - reltime.tv_nsec += 1000000000; - reltime.tv_sec -= 1; - } - - /* Sleep for the required duration. If woken by a signal, - resume waiting as required by Single Unix Specification. */ - if (reltime.tv_sec < 0 || __libc_nanosleep(&reltime, NULL) == 0) - break; - } - - /* Block the restart signal again */ - sigprocmask(SIG_SETMASK, &initial_mask, NULL); - was_signalled = 0; - } else { - was_signalled = 1; - } - THREAD_SETMEM(self, p_signal_jmp, NULL); - } - - /* Now was_signalled is true if we exited the above code - due to the delivery of a restart signal. In that case, - we know we have been dequeued and resumed and that the - resume count is balanced. Otherwise, there are some - cases to consider. First, try to bump up the resume count - back to zero. If it goes to 1, it means restart() was - invoked on this thread. The signal must be consumed - and the count bumped down and everything is cool. We - can return a 1 to the caller. - Otherwise, no restart was delivered yet, so a potential - race exists; we return a 0 to the caller which must deal - with this race in an appropriate way; for example by - atomically removing the thread from consideration for a - wakeup---if such a thing fails, it means a restart is - being delivered. */ - - if (!was_signalled) { - if (atomic_increment(&self->p_resume_count) != -1) { - __pthread_wait_for_restart_signal(self); - atomic_decrement(&self->p_resume_count); /* should be zero now! */ - /* woke spontaneously and consumed restart signal */ - return 1; - } - /* woke spontaneously but did not consume restart---caller must resolve */ - return 0; - } - /* woken due to restart signal */ - return 1; -} -#endif /* __NR_rt_sigaction */ - - -#ifdef __NR_rt_sigaction -void __pthread_restart_new(pthread_descr th) -{ - /* The barrier is proabably not needed, in which case it still documents - our assumptions. The intent is to commit previous writes to shared - memory so the woken thread will have a consistent view. Complementary - read barriers are present to the suspend functions. */ - WRITE_MEMORY_BARRIER(); - kill(th->p_pid, __pthread_sig_restart); -} - -int __pthread_timedsuspend_new(pthread_descr self, const struct timespec *abstime) -{ - sigset_t unblock, initial_mask; - int was_signalled = 0; - sigjmp_buf jmpbuf; - - if (sigsetjmp(jmpbuf, 1) == 0) { - THREAD_SETMEM(self, p_signal_jmp, &jmpbuf); - THREAD_SETMEM(self, p_signal, 0); - /* Unblock the restart signal */ - sigemptyset(&unblock); - sigaddset(&unblock, __pthread_sig_restart); - sigprocmask(SIG_UNBLOCK, &unblock, &initial_mask); - - while (1) { - struct timeval now; - struct timespec reltime; - - /* Compute a time offset relative to now. */ - gettimeofday (&now, NULL); - reltime.tv_nsec = abstime->tv_nsec - now.tv_usec * 1000; - reltime.tv_sec = abstime->tv_sec - now.tv_sec; - if (reltime.tv_nsec < 0) { - reltime.tv_nsec += 1000000000; - reltime.tv_sec -= 1; - } - - /* Sleep for the required duration. If woken by a signal, - resume waiting as required by Single Unix Specification. */ - if (reltime.tv_sec < 0 || __libc_nanosleep(&reltime, NULL) == 0) - break; - } - - /* Block the restart signal again */ - sigprocmask(SIG_SETMASK, &initial_mask, NULL); - was_signalled = 0; - } else { - was_signalled = 1; - } - THREAD_SETMEM(self, p_signal_jmp, NULL); - - /* Now was_signalled is true if we exited the above code - due to the delivery of a restart signal. In that case, - everything is cool. We have been removed from whatever - we were waiting on by the other thread, and consumed its signal. - - Otherwise we this thread woke up spontaneously, or due to a signal other - than restart. This is an ambiguous case that must be resolved by - the caller; the thread is still eligible for a restart wakeup - so there is a race. */ - - READ_MEMORY_BARRIER(); /* See comment in __pthread_restart_new */ - return was_signalled; -} -#endif - -/* Debugging aid */ - -#ifdef DEBUG_PT -#include <stdarg.h> - -void __pthread_message(char * fmt, ...) -{ - char buffer[1024]; - va_list args; - sprintf(buffer, "%05d : ", __getpid()); - va_start(args, fmt); - vsnprintf(buffer + 8, sizeof(buffer) - 8, fmt, args); - va_end(args); - TEMP_FAILURE_RETRY(__libc_write(2, buffer, strlen(buffer))); -} - -#endif - - -#ifndef __PIC__ -/* We need a hook to force the cancelation wrappers to be linked in when - static libpthread is used. */ -extern const int __pthread_provide_wrappers; -static const int *const __pthread_require_wrappers = - &__pthread_provide_wrappers; -#endif diff --git a/libpthread/linuxthreads/pthread.c-OLDEXAMPLE b/libpthread/linuxthreads/pthread.c-OLDEXAMPLE deleted file mode 100644 index 88b163087..000000000 --- a/libpthread/linuxthreads/pthread.c-OLDEXAMPLE +++ /dev/null @@ -1,121 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * A _very_ simple clone based pthread-like implementation - * - * Copyright (C) 2001,2002 by Erik Andersen <andersee@debian.org> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU Library General Public License as published by - * the Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License - * for more details. - * - * You should have received a copy of the GNU Library General Public License - * along with this program; if not, write to the Free Software Foundation, - * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <stdlib.h> -#include <sched.h> -#include <signal.h> -#include <errno.h> -#include <unistd.h> -#include <pthread.h> - -#define STACKSIZE 8096 - -#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ -#define CLONE_VM 0x00000100 /* set if VM shared between processes */ -#define CLONE_FS 0x00000200 /* set if fs info shared between proces ses */ -#define CLONE_FILES 0x00000400 /* set if open files shared between pro cesses */ -#define CLONE_SIGHAND 0x00000800 /* set if signal handlers shared */ - - - -/* Lame home-grown clone based threading */ -int pthread_mutex_init (pthread_mutex_t *mutex, const pthread_mutexattr_t *mutex_attr) -{ - mutex->__m_lock.__spinlock = 1; - return 0; -} - -int pthread_mutex_lock (pthread_mutex_t *mutex) -{ - while (mutex->__m_lock.__spinlock == 0) { - usleep(10000); - } - --(mutex->__m_lock.__spinlock); - return 0; -} - -int pthread_mutex_unlock (pthread_mutex_t *mutex) -{ - ++(mutex->__m_lock.__spinlock); - return 0; -} - -int pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex) -{ - ++(mutex->__m_lock.__spinlock); - while (cond->__c_lock.__spinlock == 0) { - usleep(10000); - } - --(cond->__c_lock.__spinlock); - return 0; -} - -int pthread_cond_signal(pthread_cond_t *cond) -{ - ++(cond->__c_lock.__spinlock); - return 0; -} - -int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *cond_attr) -{ - cond->__c_lock.__spinlock = 1; - return 0; -} - -int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void* (*fn)(void *), void *data) -{ - long retval; - void **newstack; - int (*clonefunc)(void *) = (int (*)(void *))(fn); - - newstack = (void **) malloc(STACKSIZE); - if (!newstack) - return -1; - newstack = (void **) (STACKSIZE + (char *) newstack); - *--newstack = data; - retval = clone(clonefunc, newstack, - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | SIGCHLD, data); - if (retval < 0) { - errno = -retval; - *thread = 0; - retval = -1; - } else { - *thread = retval; - retval = 0; - } - return retval; -} - -int pthread_join (pthread_t thread, void **thread_return) -{ - int retval; - /* Fixme -- wait for thread and get its return value */ - retval = EXIT_SUCCESS; - if (thread_return) - (int)*thread_return = retval; - _exit(retval); -} -link_warning(pthread_join, "pthread_join is a stub and does not behave properly"); - -void pthread_exit (void *retval) -{ - _exit(*(int *)retval); -} diff --git a/libpthread/linuxthreads/ptlongjmp.c b/libpthread/linuxthreads/ptlongjmp.c deleted file mode 100644 index c0ea8223a..000000000 --- a/libpthread/linuxthreads/ptlongjmp.c +++ /dev/null @@ -1,55 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1998 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Redefine siglongjmp and longjmp so that they interact correctly - with cleanup handlers */ - -#include <setjmp.h> -#include "pthread.h" -#include "internals.h" - -/* These functions are not declared anywhere since they shouldn't be - used at another place but here. */ -extern void __libc_siglongjmp (sigjmp_buf env, int val) - __attribute__ ((noreturn)); -extern void __libc_longjmp (sigjmp_buf env, int val) - __attribute__ ((noreturn)); - - -static void pthread_cleanup_upto(__jmp_buf target) -{ - pthread_descr self = thread_self(); - struct _pthread_cleanup_buffer * c; - - for (c = THREAD_GETMEM(self, p_cleanup); - c != NULL && _JMPBUF_UNWINDS(target, c); - c = c->__prev) - c->__routine(c->__arg); - THREAD_SETMEM(self, p_cleanup, c); - if (THREAD_GETMEM(self, p_in_sighandler) - && _JMPBUF_UNWINDS(target, THREAD_GETMEM(self, p_in_sighandler))) - THREAD_SETMEM(self, p_in_sighandler, NULL); -} - -void siglongjmp(sigjmp_buf env, int val) -{ - pthread_cleanup_upto(env->__jmpbuf); - __libc_siglongjmp(env, val); -} - -void longjmp(jmp_buf env, int val) -{ - pthread_cleanup_upto(env->__jmpbuf); - __libc_siglongjmp(env, val); -} diff --git a/libpthread/linuxthreads/queue.h b/libpthread/linuxthreads/queue.h deleted file mode 100644 index 28bd75531..000000000 --- a/libpthread/linuxthreads/queue.h +++ /dev/null @@ -1,61 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Waiting queues */ - -/* Waiting queues are represented by lists of thread descriptors - linked through their p_nextwaiting field. The lists are kept - sorted by decreasing priority, and then decreasing waiting time. */ - -static inline void enqueue(pthread_descr * q, pthread_descr th) -{ - int prio = th->p_priority; - ASSERT(th->p_nextwaiting == NULL); - for (; *q != NULL; q = &((*q)->p_nextwaiting)) { - if (prio > (*q)->p_priority) { - th->p_nextwaiting = *q; - *q = th; - return; - } - } - *q = th; -} - -static inline pthread_descr dequeue(pthread_descr * q) -{ - pthread_descr th; - th = *q; - if (th != NULL) { - *q = th->p_nextwaiting; - th->p_nextwaiting = NULL; - } - return th; -} - -static inline int remove_from_queue(pthread_descr * q, pthread_descr th) -{ - for (; *q != NULL; q = &((*q)->p_nextwaiting)) { - if (*q == th) { - *q = th->p_nextwaiting; - th->p_nextwaiting = NULL; - return 1; - } - } - return 0; -} - -static inline int queue_is_empty(pthread_descr * q) -{ - return *q == NULL; -} diff --git a/libpthread/linuxthreads/restart.h b/libpthread/linuxthreads/restart.h deleted file mode 100644 index 687d92fae..000000000 --- a/libpthread/linuxthreads/restart.h +++ /dev/null @@ -1,50 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -#include <signal.h> -#include <sys/syscall.h> -#define __ASSUME_REALTIME_SIGNALS defined(__NR_rt_sigaction) - -/* Primitives for controlling thread execution */ - -static inline void restart(pthread_descr th) -{ - /* See pthread.c */ -#if __ASSUME_REALTIME_SIGNALS - __pthread_restart_new(th); -#else - __pthread_restart(th); -#endif -} - -static inline void suspend(pthread_descr self) -{ - /* See pthread.c */ -#if __ASSUME_REALTIME_SIGNALS - __pthread_wait_for_restart_signal(self); -#else - __pthread_suspend(self); -#endif -} - -static inline int timedsuspend(pthread_descr self, - const struct timespec *abstime) -{ - /* See pthread.c */ -#if __ASSUME_REALTIME_SIGNALS - return __pthread_timedsuspend_new(self, abstime); -#else - return __pthread_timedsuspend(self, abstime); -#endif -} diff --git a/libpthread/linuxthreads/rwlock.c b/libpthread/linuxthreads/rwlock.c deleted file mode 100644 index 977fd88af..000000000 --- a/libpthread/linuxthreads/rwlock.c +++ /dev/null @@ -1,486 +0,0 @@ -/* Read-write lock implementation. - Copyright (C) 1998 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Xavier Leroy <Xavier.Leroy@inria.fr> - and Ulrich Drepper <drepper@cygnus.com>, 1998. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include <errno.h> -#include <pthread.h> -#include <stdlib.h> -#include "internals.h" -#include "queue.h" -#include "spinlock.h" -#include "restart.h" - -/* - * Check whether the calling thread already owns one or more read locks on the - * specified lock. If so, return a pointer to the read lock info structure - * corresponding to that lock. - */ - -static pthread_readlock_info * -rwlock_is_in_list(pthread_descr self, pthread_rwlock_t *rwlock) -{ - pthread_readlock_info *info; - - for (info = self->p_readlock_list; info != NULL; info = info->pr_next) - { - if (info->pr_lock == rwlock) - return info; - } - - return NULL; -} - -/* - * Add a new lock to the thread's list of locks for which it has a read lock. - * A new info node must be allocated for this, which is taken from the thread's - * free list, or by calling malloc. If malloc fails, a null pointer is - * returned. Otherwise the lock info structure is initialized and pushed - * onto the thread's list. - */ - -static pthread_readlock_info * -rwlock_add_to_list(pthread_descr self, pthread_rwlock_t *rwlock) -{ - pthread_readlock_info *info = self->p_readlock_free; - - if (info != NULL) - self->p_readlock_free = info->pr_next; - else - info = malloc(sizeof *info); - - if (info == NULL) - return NULL; - - info->pr_lock_count = 1; - info->pr_lock = rwlock; - info->pr_next = self->p_readlock_list; - self->p_readlock_list = info; - - return info; -} - -/* - * If the thread owns a read lock over the given pthread_rwlock_t, - * and this read lock is tracked in the thread's lock list, - * this function returns a pointer to the info node in that list. - * It also decrements the lock count within that node, and if - * it reaches zero, it removes the node from the list. - * If nothing is found, it returns a null pointer. - */ - -static pthread_readlock_info * -rwlock_remove_from_list(pthread_descr self, pthread_rwlock_t *rwlock) -{ - pthread_readlock_info **pinfo; - - for (pinfo = &self->p_readlock_list; *pinfo != NULL; pinfo = &(*pinfo)->pr_next) - { - if ((*pinfo)->pr_lock == rwlock) - { - pthread_readlock_info *info = *pinfo; - if (--info->pr_lock_count == 0) - *pinfo = info->pr_next; - return info; - } - } - - return NULL; -} - -/* - * This function checks whether the conditions are right to place a read lock. - * It returns 1 if so, otherwise zero. The rwlock's internal lock must be - * locked upon entry. - */ - -static int -rwlock_can_rdlock(pthread_rwlock_t *rwlock, int have_lock_already) -{ - /* Can't readlock; it is write locked. */ - if (rwlock->__rw_writer != NULL) - return 0; - - /* Lock prefers readers; get it. */ - if (rwlock->__rw_kind == PTHREAD_RWLOCK_PREFER_READER_NP) - return 1; - - /* Lock prefers writers, but none are waiting. */ - if (queue_is_empty(&rwlock->__rw_write_waiting)) - return 1; - - /* Writers are waiting, but this thread already has a read lock */ - if (have_lock_already) - return 1; - - /* Writers are waiting, and this is a new lock */ - return 0; -} - -/* - * This function helps support brain-damaged recursive read locking - * semantics required by Unix 98, while maintaining write priority. - * This basically determines whether this thread already holds a read lock - * already. It returns 1 if so, otherwise it returns 0. - * - * If the thread has any ``untracked read locks'' then it just assumes - * that this lock is among them, just to be safe, and returns 1. - * - * Also, if it finds the thread's lock in the list, it sets the pointer - * referenced by pexisting to refer to the list entry. - * - * If the thread has no untracked locks, and the lock is not found - * in its list, then it is added to the list. If this fails, - * then *pout_of_mem is set to 1. - */ - -static int -rwlock_have_already(pthread_descr *pself, pthread_rwlock_t *rwlock, - pthread_readlock_info **pexisting, int *pout_of_mem) -{ - pthread_readlock_info *existing = NULL; - int out_of_mem = 0, have_lock_already = 0; - pthread_descr self = *pself; - - if (rwlock->__rw_kind == PTHREAD_RWLOCK_PREFER_WRITER_NP) - { - if (!self) - self = thread_self(); - - existing = rwlock_is_in_list(self, rwlock); - - if (existing != NULL || self->p_untracked_readlock_count > 0) - have_lock_already = 1; - else - { - existing = rwlock_add_to_list(self, rwlock); - if (existing == NULL) - out_of_mem = 1; - } - } - - *pout_of_mem = out_of_mem; - *pexisting = existing; - *pself = self; - - return have_lock_already; -} - -int -pthread_rwlock_init (pthread_rwlock_t *rwlock, - const pthread_rwlockattr_t *attr) -{ - __pthread_init_lock(&rwlock->__rw_lock); - rwlock->__rw_readers = 0; - rwlock->__rw_writer = NULL; - rwlock->__rw_read_waiting = NULL; - rwlock->__rw_write_waiting = NULL; - - if (attr == NULL) - { - rwlock->__rw_kind = PTHREAD_RWLOCK_DEFAULT_NP; - rwlock->__rw_pshared = PTHREAD_PROCESS_PRIVATE; - } - else - { - rwlock->__rw_kind = attr->__lockkind; - rwlock->__rw_pshared = attr->__pshared; - } - - return 0; -} - - -int -pthread_rwlock_destroy (pthread_rwlock_t *rwlock) -{ - int readers; - _pthread_descr writer; - - __pthread_lock (&rwlock->__rw_lock, NULL); - readers = rwlock->__rw_readers; - writer = rwlock->__rw_writer; - __pthread_unlock (&rwlock->__rw_lock); - - if (readers > 0 || writer != NULL) - return EBUSY; - - return 0; -} - -int -pthread_rwlock_rdlock (pthread_rwlock_t *rwlock) -{ - pthread_descr self = NULL; - pthread_readlock_info *existing; - int out_of_mem, have_lock_already; - - have_lock_already = rwlock_have_already(&self, rwlock, - &existing, &out_of_mem); - - for (;;) - { - if (self == NULL) - self = thread_self (); - - __pthread_lock (&rwlock->__rw_lock, self); - - if (rwlock_can_rdlock(rwlock, have_lock_already)) - break; - - enqueue (&rwlock->__rw_read_waiting, self); - __pthread_unlock (&rwlock->__rw_lock); - suspend (self); /* This is not a cancellation point */ - } - - ++rwlock->__rw_readers; - __pthread_unlock (&rwlock->__rw_lock); - - if (have_lock_already || out_of_mem) - { - if (existing != NULL) - existing->pr_lock_count++; - else - self->p_untracked_readlock_count++; - } - - return 0; -} - -int -pthread_rwlock_tryrdlock (pthread_rwlock_t *rwlock) -{ - pthread_descr self = thread_self(); - pthread_readlock_info *existing; - int out_of_mem, have_lock_already; - int retval = EBUSY; - - have_lock_already = rwlock_have_already(&self, rwlock, - &existing, &out_of_mem); - - __pthread_lock (&rwlock->__rw_lock, self); - - /* 0 is passed to here instead of have_lock_already. - This is to meet Single Unix Spec requirements: - if writers are waiting, pthread_rwlock_tryrdlock - does not acquire a read lock, even if the caller has - one or more read locks already. */ - - if (rwlock_can_rdlock(rwlock, 0)) - { - ++rwlock->__rw_readers; - retval = 0; - } - - __pthread_unlock (&rwlock->__rw_lock); - - if (retval == 0) - { - if (have_lock_already || out_of_mem) - { - if (existing != NULL) - existing->pr_lock_count++; - else - self->p_untracked_readlock_count++; - } - } - - return retval; -} - - -int -pthread_rwlock_wrlock (pthread_rwlock_t *rwlock) -{ - pthread_descr self = thread_self (); - - while(1) - { - __pthread_lock (&rwlock->__rw_lock, self); - if (rwlock->__rw_readers == 0 && rwlock->__rw_writer == NULL) - { - rwlock->__rw_writer = self; - __pthread_unlock (&rwlock->__rw_lock); - return 0; - } - - /* Suspend ourselves, then try again */ - enqueue (&rwlock->__rw_write_waiting, self); - __pthread_unlock (&rwlock->__rw_lock); - suspend (self); /* This is not a cancellation point */ - } -} - - -int -pthread_rwlock_trywrlock (pthread_rwlock_t *rwlock) -{ - int result = EBUSY; - - __pthread_lock (&rwlock->__rw_lock, NULL); - if (rwlock->__rw_readers == 0 && rwlock->__rw_writer == NULL) - { - rwlock->__rw_writer = thread_self (); - result = 0; - } - __pthread_unlock (&rwlock->__rw_lock); - - return result; -} - - -int -pthread_rwlock_unlock (pthread_rwlock_t *rwlock) -{ - pthread_descr torestart; - pthread_descr th; - - __pthread_lock (&rwlock->__rw_lock, NULL); - if (rwlock->__rw_writer != NULL) - { - /* Unlocking a write lock. */ - if (rwlock->__rw_writer != thread_self ()) - { - __pthread_unlock (&rwlock->__rw_lock); - return EPERM; - } - rwlock->__rw_writer = NULL; - - if (rwlock->__rw_kind == PTHREAD_RWLOCK_PREFER_READER_NP - || (th = dequeue (&rwlock->__rw_write_waiting)) == NULL) - { - /* Restart all waiting readers. */ - torestart = rwlock->__rw_read_waiting; - rwlock->__rw_read_waiting = NULL; - __pthread_unlock (&rwlock->__rw_lock); - while ((th = dequeue (&torestart)) != NULL) - restart (th); - } - else - { - /* Restart one waiting writer. */ - __pthread_unlock (&rwlock->__rw_lock); - restart (th); - } - } - else - { - /* Unlocking a read lock. */ - if (rwlock->__rw_readers == 0) - { - __pthread_unlock (&rwlock->__rw_lock); - return EPERM; - } - - --rwlock->__rw_readers; - if (rwlock->__rw_readers == 0) - /* Restart one waiting writer, if any. */ - th = dequeue (&rwlock->__rw_write_waiting); - else - th = NULL; - - __pthread_unlock (&rwlock->__rw_lock); - if (th != NULL) - restart (th); - - /* Recursive lock fixup */ - - if (rwlock->__rw_kind == PTHREAD_RWLOCK_PREFER_WRITER_NP) - { - pthread_descr self = thread_self(); - pthread_readlock_info *victim = rwlock_remove_from_list(self, rwlock); - - if (victim != NULL) - { - if (victim->pr_lock_count == 0) - { - victim->pr_next = self->p_readlock_free; - self->p_readlock_free = victim; - } - } - else - { - if (self->p_untracked_readlock_count > 0) - self->p_untracked_readlock_count--; - } - } - } - - return 0; -} - - - -int -pthread_rwlockattr_init (pthread_rwlockattr_t *attr) -{ - attr->__lockkind = 0; - attr->__pshared = 0; - - return 0; -} - - -int -pthread_rwlockattr_destroy (pthread_rwlockattr_t *attr) -{ - return 0; -} - - -int -pthread_rwlockattr_getpshared (const pthread_rwlockattr_t *attr, int *pshared) -{ - *pshared = attr->__pshared; - return 0; -} - - -int -pthread_rwlockattr_setpshared (pthread_rwlockattr_t *attr, int pshared) -{ - if (pshared != PTHREAD_PROCESS_PRIVATE && pshared != PTHREAD_PROCESS_SHARED) - return EINVAL; - - attr->__pshared = pshared; - - return 0; -} - - -int -pthread_rwlockattr_getkind_np (const pthread_rwlockattr_t *attr, int *pref) -{ - *pref = attr->__lockkind; - return 0; -} - - -int -pthread_rwlockattr_setkind_np (pthread_rwlockattr_t *attr, int pref) -{ - if (pref != PTHREAD_RWLOCK_PREFER_READER_NP - && pref != PTHREAD_RWLOCK_PREFER_WRITER_NP - && pref != PTHREAD_RWLOCK_DEFAULT_NP) - return EINVAL; - - attr->__lockkind = pref; - - return 0; -} diff --git a/libpthread/linuxthreads/semaphore.c b/libpthread/linuxthreads/semaphore.c deleted file mode 100644 index 5be1f5316..000000000 --- a/libpthread/linuxthreads/semaphore.c +++ /dev/null @@ -1,308 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Semaphores a la POSIX 1003.1b */ - -#include <features.h> -#define __USE_GNU -#include <errno.h> -#include "pthread.h" -#include "semaphore.h" -#include "internals.h" -#include "spinlock.h" -#include "restart.h" -#include "queue.h" - -int __new_sem_init(sem_t *sem, int pshared, unsigned int value) -{ - if (value > SEM_VALUE_MAX) { - errno = EINVAL; - return -1; - } - if (pshared) { - errno = ENOSYS; - return -1; - } - __pthread_init_lock(&sem->__sem_lock); - sem->__sem_value = value; - sem->__sem_waiting = NULL; - return 0; -} - -/* Function called by pthread_cancel to remove the thread from - waiting inside __new_sem_wait. */ - -static int new_sem_extricate_func(void *obj, pthread_descr th) -{ - volatile pthread_descr self = thread_self(); - sem_t *sem = obj; - int did_remove = 0; - - __pthread_lock(&sem->__sem_lock, self); - did_remove = remove_from_queue(&sem->__sem_waiting, th); - __pthread_unlock(&sem->__sem_lock); - - return did_remove; -} - -int __new_sem_wait(sem_t * sem) -{ - volatile pthread_descr self = thread_self(); - pthread_extricate_if extr; - int already_canceled = 0; - int spurious_wakeup_count; - - /* Set up extrication interface */ - extr.pu_object = sem; - extr.pu_extricate_func = new_sem_extricate_func; - - __pthread_lock(&sem->__sem_lock, self); - if (sem->__sem_value > 0) { - sem->__sem_value--; - __pthread_unlock(&sem->__sem_lock); - return 0; - } - /* Register extrication interface */ - THREAD_SETMEM(self, p_sem_avail, 0); - __pthread_set_own_extricate_if(self, &extr); - /* Enqueue only if not already cancelled. */ - if (!(THREAD_GETMEM(self, p_canceled) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE)) - enqueue(&sem->__sem_waiting, self); - else - already_canceled = 1; - __pthread_unlock(&sem->__sem_lock); - - if (already_canceled) { - __pthread_set_own_extricate_if(self, 0); - pthread_exit(PTHREAD_CANCELED); - } - - /* Wait for sem_post or cancellation, or fall through if already canceled */ - spurious_wakeup_count = 0; - while (1) - { - suspend(self); - if (THREAD_GETMEM(self, p_sem_avail) == 0 - && (THREAD_GETMEM(self, p_woken_by_cancel) == 0 - || THREAD_GETMEM(self, p_cancelstate) != PTHREAD_CANCEL_ENABLE)) - { - /* Count resumes that don't belong to us. */ - spurious_wakeup_count++; - continue; - } - break; - } - __pthread_set_own_extricate_if(self, 0); - - /* Terminate only if the wakeup came from cancellation. */ - /* Otherwise ignore cancellation because we got the semaphore. */ - - if (THREAD_GETMEM(self, p_woken_by_cancel) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) { - THREAD_SETMEM(self, p_woken_by_cancel, 0); - pthread_exit(PTHREAD_CANCELED); - } - /* We got the semaphore */ - return 0; -} - -int __new_sem_trywait(sem_t * sem) -{ - int retval; - - __pthread_lock(&sem->__sem_lock, NULL); - if (sem->__sem_value == 0) { - errno = EAGAIN; - retval = -1; - } else { - sem->__sem_value--; - retval = 0; - } - __pthread_unlock(&sem->__sem_lock); - return retval; -} - -int __new_sem_post(sem_t * sem) -{ - pthread_descr self = thread_self(); - pthread_descr th; - struct pthread_request request; - - if (THREAD_GETMEM(self, p_in_sighandler) == NULL) { - __pthread_lock(&sem->__sem_lock, self); - if (sem->__sem_waiting == NULL) { - if (sem->__sem_value >= SEM_VALUE_MAX) { - /* Overflow */ - errno = ERANGE; - __pthread_unlock(&sem->__sem_lock); - return -1; - } - sem->__sem_value++; - __pthread_unlock(&sem->__sem_lock); - } else { - th = dequeue(&sem->__sem_waiting); - __pthread_unlock(&sem->__sem_lock); - th->p_sem_avail = 1; - WRITE_MEMORY_BARRIER(); - restart(th); - } - } else { - /* If we're in signal handler, delegate post operation to - the thread manager. */ - if (__pthread_manager_request < 0) { - if (__pthread_initialize_manager() < 0) { - errno = EAGAIN; - return -1; - } - } - request.req_kind = REQ_POST; - request.req_args.post = sem; - TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request, - (char *) &request, sizeof(request))); - } - return 0; -} - -int __new_sem_getvalue(sem_t * sem, int * sval) -{ - *sval = sem->__sem_value; - return 0; -} - -int __new_sem_destroy(sem_t * sem) -{ - if (sem->__sem_waiting != NULL) { - __set_errno (EBUSY); - return -1; - } - return 0; -} - -sem_t *sem_open(const char *name, int oflag, ...) -{ - __set_errno (ENOSYS); - return SEM_FAILED; -} - -int sem_close(sem_t *sem) -{ - __set_errno (ENOSYS); - return -1; -} - -int sem_unlink(const char *name) -{ - __set_errno (ENOSYS); - return -1; -} - -int sem_timedwait(sem_t *sem, const struct timespec *abstime) -{ - pthread_descr self = thread_self(); - pthread_extricate_if extr; - int already_canceled = 0; - int spurious_wakeup_count; - - __pthread_lock(&sem->__sem_lock, self); - if (sem->__sem_value > 0) { - --sem->__sem_value; - __pthread_unlock(&sem->__sem_lock); - return 0; - } - - if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) { - /* The standard requires that if the function would block and the - time value is illegal, the function returns with an error. */ - __pthread_unlock(&sem->__sem_lock); - __set_errno (EINVAL); - return -1; - } - - /* Set up extrication interface */ - extr.pu_object = sem; - extr.pu_extricate_func = new_sem_extricate_func; - - /* Register extrication interface */ - THREAD_SETMEM(self, p_sem_avail, 0); - __pthread_set_own_extricate_if(self, &extr); - /* Enqueue only if not already cancelled. */ - if (!(THREAD_GETMEM(self, p_canceled) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE)) - enqueue(&sem->__sem_waiting, self); - else - already_canceled = 1; - __pthread_unlock(&sem->__sem_lock); - - if (already_canceled) { - __pthread_set_own_extricate_if(self, 0); - pthread_exit(PTHREAD_CANCELED); - } - - spurious_wakeup_count = 0; - while (1) - { - if (timedsuspend(self, abstime) == 0) { - int was_on_queue; - - /* __pthread_lock will queue back any spurious restarts that - may happen to it. */ - - __pthread_lock(&sem->__sem_lock, self); - was_on_queue = remove_from_queue(&sem->__sem_waiting, self); - __pthread_unlock(&sem->__sem_lock); - - if (was_on_queue) { - __pthread_set_own_extricate_if(self, 0); - __set_errno (ETIMEDOUT); - return -1; - } - - /* Eat the outstanding restart() from the signaller */ - suspend(self); - } - - if (THREAD_GETMEM(self, p_sem_avail) == 0 - && (THREAD_GETMEM(self, p_woken_by_cancel) == 0 - || THREAD_GETMEM(self, p_cancelstate) != PTHREAD_CANCEL_ENABLE)) - { - /* Count resumes that don't belong to us. */ - spurious_wakeup_count++; - continue; - } - break; - } - - __pthread_set_own_extricate_if(self, 0); - - /* Terminate only if the wakeup came from cancellation. */ - /* Otherwise ignore cancellation because we got the semaphore. */ - - if (THREAD_GETMEM(self, p_woken_by_cancel) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) { - THREAD_SETMEM(self, p_woken_by_cancel, 0); - pthread_exit(PTHREAD_CANCELED); - } - /* We got the semaphore */ - return 0; -} - - -weak_alias (__new_sem_init, sem_init) -weak_alias (__new_sem_wait, sem_wait) -weak_alias (__new_sem_trywait, sem_trywait) -weak_alias (__new_sem_post, sem_post) -weak_alias (__new_sem_getvalue, sem_getvalue) -weak_alias (__new_sem_destroy, sem_destroy) - diff --git a/libpthread/linuxthreads/semaphore.h b/libpthread/linuxthreads/semaphore.h deleted file mode 100644 index 7b09ea931..000000000 --- a/libpthread/linuxthreads/semaphore.h +++ /dev/null @@ -1,87 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -#ifndef _SEMAPHORE_H -#define _SEMAPHORE_H 1 - -#include <features.h> -#include <sys/types.h> -#ifdef __USE_XOPEN2K -# define __need_timespec -# include <time.h> -#endif - -#ifndef _PTHREAD_DESCR_DEFINED -/* Thread descriptors. Needed for `sem_t' definition. */ -typedef struct _pthread_descr_struct *_pthread_descr; -# define _PTHREAD_DESCR_DEFINED -#endif - -/* System specific semaphore definition. */ -typedef struct -{ - struct _pthread_fastlock __sem_lock; - int __sem_value; - _pthread_descr __sem_waiting; -} sem_t; - - - -/* Value returned if `sem_open' failed. */ -#define SEM_FAILED ((sem_t *) 0) - -/* Maximum value the semaphore can have. */ -#define SEM_VALUE_MAX ((int) ((~0u) >> 1)) - - -__BEGIN_DECLS - -/* Initialize semaphore object SEM to VALUE. If PSHARED then share it - with other processes. */ -extern int sem_init (sem_t *__sem, int __pshared, unsigned int __value) __THROW; - -/* Free resources associated with semaphore object SEM. */ -extern int sem_destroy (sem_t *__sem) __THROW; - -/* Open a named semaphore NAME with open flaot OFLAG. */ -extern sem_t *sem_open (__const char *__name, int __oflag, ...) __THROW; - -/* Close descriptor for named semaphore SEM. */ -extern int sem_close (sem_t *__sem) __THROW; - -/* Remove named semaphore NAME. */ -extern int sem_unlink (__const char *__name) __THROW; - -/* Wait for SEM being posted. */ -extern int sem_wait (sem_t *__sem); - -#ifdef __USE_XOPEN2K -/* Similar to `sem_wait' but wait only until ABSTIME. */ -extern int sem_timedwait (sem_t *__restrict __sem, - __const struct timespec *__restrict __abstime); -#endif - -/* Test whether SEM is posted. */ -extern int sem_trywait (sem_t *__sem) __THROW; - -/* Post SEM. */ -extern int sem_post (sem_t *__sem) __THROW; - -/* Get current value of SEM and store it in *SVAL. */ -extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval) - __THROW; - -__END_DECLS - -#endif /* semaphore.h */ diff --git a/libpthread/linuxthreads/signals.c b/libpthread/linuxthreads/signals.c deleted file mode 100644 index df15b884e..000000000 --- a/libpthread/linuxthreads/signals.c +++ /dev/null @@ -1,248 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Handling of signals */ - -#include <errno.h> -#include <signal.h> -#include <stdio.h> -#include "pthread.h" -#include "internals.h" -#include "spinlock.h" -#include <ucontext.h> -#include <bits/sigcontextinfo.h> - -/* mods for uClibc: __libc_sigaction is not in any standard headers */ -extern int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact); - -int pthread_sigmask(int how, const sigset_t * newmask, sigset_t * oldmask) -{ - sigset_t mask; - - if (newmask != NULL) { - mask = *newmask; - /* Don't allow __pthread_sig_restart to be unmasked. - Don't allow __pthread_sig_cancel to be masked. */ - switch(how) { - case SIG_SETMASK: - sigaddset(&mask, __pthread_sig_restart); - sigdelset(&mask, __pthread_sig_cancel); - if (__pthread_sig_debug > 0) - sigdelset(&mask, __pthread_sig_debug); - break; - case SIG_BLOCK: - sigdelset(&mask, __pthread_sig_cancel); - if (__pthread_sig_debug > 0) - sigdelset(&mask, __pthread_sig_debug); - break; - case SIG_UNBLOCK: - sigdelset(&mask, __pthread_sig_restart); - break; - } - newmask = &mask; - } - if (sigprocmask(how, newmask, oldmask) == -1) - return errno; - else - return 0; -} - -int pthread_kill(pthread_t thread, int signo) -{ - pthread_handle handle = thread_handle(thread); - int pid; - - __pthread_lock(&handle->h_lock, NULL); - if (invalid_handle(handle, thread)) { - __pthread_unlock(&handle->h_lock); - return ESRCH; - } - pid = handle->h_descr->p_pid; - __pthread_unlock(&handle->h_lock); - if (kill(pid, signo) == -1) - return errno; - else - return 0; -} - -/* User-provided signal handlers */ -typedef void (*arch_sighandler_t) __PMT ((int, SIGCONTEXT)); -static union -{ - arch_sighandler_t old; - void (*rt) (int, struct siginfo *, struct ucontext *); -} sighandler[NSIG]; - -/* The wrapper around user-provided signal handlers */ -static void pthread_sighandler(int signo, SIGCONTEXT ctx) -{ - pthread_descr self = thread_self(); - char * in_sighandler; - /* If we're in a sigwait operation, just record the signal received - and return without calling the user's handler */ - if (THREAD_GETMEM(self, p_sigwaiting)) { - THREAD_SETMEM(self, p_sigwaiting, 0); - THREAD_SETMEM(self, p_signal, signo); - return; - } - /* Record that we're in a signal handler and call the user's - handler function */ - in_sighandler = THREAD_GETMEM(self, p_in_sighandler); - if (in_sighandler == NULL) - THREAD_SETMEM(self, p_in_sighandler, CURRENT_STACK_FRAME); - sighandler[signo].old(signo, SIGCONTEXT_EXTRA_ARGS ctx); - if (in_sighandler == NULL) - THREAD_SETMEM(self, p_in_sighandler, NULL); -} - -/* The same, this time for real-time signals. */ -static void pthread_sighandler_rt(int signo, struct siginfo *si, - struct ucontext *uc) -{ - pthread_descr self = thread_self(); - char * in_sighandler; - /* If we're in a sigwait operation, just record the signal received - and return without calling the user's handler */ - if (THREAD_GETMEM(self, p_sigwaiting)) { - THREAD_SETMEM(self, p_sigwaiting, 0); - THREAD_SETMEM(self, p_signal, signo); - return; - } - /* Record that we're in a signal handler and call the user's - handler function */ - in_sighandler = THREAD_GETMEM(self, p_in_sighandler); - if (in_sighandler == NULL) - THREAD_SETMEM(self, p_in_sighandler, CURRENT_STACK_FRAME); - sighandler[signo].rt(signo, si, uc); - if (in_sighandler == NULL) - THREAD_SETMEM(self, p_in_sighandler, NULL); -} - -/* The wrapper around sigaction. Install our own signal handler - around the signal. */ -int __sigaction(int sig, const struct sigaction * act, - struct sigaction * oact) -{ - struct sigaction newact; - struct sigaction *newactp; - -#ifdef DEBUG_PT -printf(__FUNCTION__": pthreads wrapper!\n"); -#endif - if (sig == __pthread_sig_restart || - sig == __pthread_sig_cancel || - (sig == __pthread_sig_debug && __pthread_sig_debug > 0)) - return EINVAL; - if (act) - { - newact = *act; - if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL - && sig > 0 && sig < NSIG) - { - if (act->sa_flags & SA_SIGINFO) - newact.sa_handler = (__sighandler_t) pthread_sighandler_rt; - else - newact.sa_handler = (__sighandler_t) pthread_sighandler; - } - newactp = &newact; - } - else - newactp = NULL; - if (__libc_sigaction(sig, newactp, oact) == -1) - return -1; -#ifdef DEBUG_PT -printf(__FUNCTION__": signahdler installed, __sigaction successful\n"); -#endif - if (sig > 0 && sig < NSIG) - { - if (oact != NULL) - oact->sa_handler = (__sighandler_t) sighandler[sig].old; - if (act) - /* For the assignment is does not matter whether it's a normal - or real-time signal. */ - sighandler[sig].old = (arch_sighandler_t) act->sa_handler; - } - return 0; -} -strong_alias(__sigaction, sigaction) - -/* A signal handler that does nothing */ -static void pthread_null_sighandler(int sig) { } - -/* sigwait -- synchronously wait for a signal */ -int sigwait(const sigset_t * set, int * sig) -{ - volatile pthread_descr self = thread_self(); - sigset_t mask; - int s; - sigjmp_buf jmpbuf; - struct sigaction sa; - - /* Get ready to block all signals except those in set - and the cancellation signal. - Also check that handlers are installed on all signals in set, - and if not, install our dummy handler. This is conformant to - POSIX: "The effect of sigwait() on the signal actions for the - signals in set is unspecified." */ - sigfillset(&mask); - sigdelset(&mask, __pthread_sig_cancel); - for (s = 1; s <= NSIG; s++) { - if (sigismember(set, s) && - s != __pthread_sig_restart && - s != __pthread_sig_cancel && - s != __pthread_sig_debug) { - sigdelset(&mask, s); - if (sighandler[s].old == NULL || - sighandler[s].old == (arch_sighandler_t) SIG_DFL || - sighandler[s].old == (arch_sighandler_t) SIG_IGN) { - sa.sa_handler = pthread_null_sighandler; - sigemptyset(&sa.sa_mask); - sa.sa_flags = 0; - sigaction(s, &sa, NULL); - } - } - } - /* Test for cancellation */ - if (sigsetjmp(jmpbuf, 1) == 0) { - THREAD_SETMEM(self, p_cancel_jmp, &jmpbuf); - if (! (THREAD_GETMEM(self, p_canceled) - && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE)) { - /* Reset the signal count */ - THREAD_SETMEM(self, p_signal, 0); - /* Say we're in sigwait */ - THREAD_SETMEM(self, p_sigwaiting, 1); - /* Unblock the signals and wait for them */ - sigsuspend(&mask); - } - } - THREAD_SETMEM(self, p_cancel_jmp, NULL); - /* The signals are now reblocked. Check for cancellation */ - pthread_testcancel(); - /* We should have self->p_signal != 0 and equal to the signal received */ - *sig = THREAD_GETMEM(self, p_signal); - return 0; -} - -/* Redefine raise() to send signal to calling thread only, - as per POSIX 1003.1c */ -int raise (int sig) -{ - int retcode = pthread_kill(pthread_self(), sig); - if (retcode == 0) - return 0; - else { - errno = retcode; - return -1; - } -} diff --git a/libpthread/linuxthreads/specific.c b/libpthread/linuxthreads/specific.c deleted file mode 100644 index d8b5bb0b3..000000000 --- a/libpthread/linuxthreads/specific.c +++ /dev/null @@ -1,204 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Thread-specific data */ - -#include <features.h> -#define __USE_GNU -#include <errno.h> -#include <stddef.h> -#include <stdlib.h> -#include "pthread.h" -#include "internals.h" -#include "spinlock.h" -#include "restart.h" - - -/* Table of keys. */ - -static struct pthread_key_struct pthread_keys[PTHREAD_KEYS_MAX] = - { { 0, NULL } }; - -/* For debugging purposes put the maximum number of keys in a variable. */ -const int __linuxthreads_pthread_keys_max = PTHREAD_KEYS_MAX; -const int __linuxthreads_pthread_key_2ndlevel_size = PTHREAD_KEY_2NDLEVEL_SIZE; - -/* Mutex to protect access to pthread_keys */ - -static pthread_mutex_t pthread_keys_mutex = PTHREAD_MUTEX_INITIALIZER; - -/* Create a new key */ - -int pthread_key_create(pthread_key_t * key, destr_function destr) -{ - int i; - - pthread_mutex_lock(&pthread_keys_mutex); - for (i = 0; i < PTHREAD_KEYS_MAX; i++) { - if (! pthread_keys[i].in_use) { - /* Mark key in use */ - pthread_keys[i].in_use = 1; - pthread_keys[i].destr = destr; - pthread_mutex_unlock(&pthread_keys_mutex); - *key = i; - return 0; - } - } - pthread_mutex_unlock(&pthread_keys_mutex); - return EAGAIN; -} - -/* Delete a key */ -int pthread_key_delete(pthread_key_t key) -{ - pthread_descr self = thread_self(); - - pthread_mutex_lock(&pthread_keys_mutex); - if (key >= PTHREAD_KEYS_MAX || !pthread_keys[key].in_use) { - pthread_mutex_unlock(&pthread_keys_mutex); - return EINVAL; - } - pthread_keys[key].in_use = 0; - pthread_keys[key].destr = NULL; - - /* Set the value of the key to NULL in all running threads, so - that if the key is reallocated later by pthread_key_create, its - associated values will be NULL in all threads. - Do nothing if no threads have been created yet. */ - if (__pthread_manager_request != -1) - { - pthread_descr th; - unsigned int idx1st, idx2nd; - - idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE; - idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE; - th = self; - do { - /* If the thread already is terminated don't modify the memory. */ - if (!th->p_terminated && th->p_specific[idx1st] != NULL) - th->p_specific[idx1st][idx2nd] = NULL; - th = th->p_nextlive; - } while (th != self); - } - - pthread_mutex_unlock(&pthread_keys_mutex); - return 0; -} - -/* Set the value of a key */ - -int pthread_setspecific(pthread_key_t key, const void * pointer) -{ - pthread_descr self = thread_self(); - unsigned int idx1st, idx2nd; - - if (key >= PTHREAD_KEYS_MAX || !pthread_keys[key].in_use) - return EINVAL; - idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE; - idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE; - if (THREAD_GETMEM_NC(self, p_specific[idx1st]) == NULL) { - void *newp = calloc(PTHREAD_KEY_2NDLEVEL_SIZE, sizeof (void *)); - if (newp == NULL) - return ENOMEM; - THREAD_SETMEM_NC(self, p_specific[idx1st], newp); - } - THREAD_GETMEM_NC(self, p_specific[idx1st])[idx2nd] = (void *) pointer; - return 0; -} - -/* Get the value of a key */ - -void * pthread_getspecific(pthread_key_t key) -{ - pthread_descr self = thread_self(); - unsigned int idx1st, idx2nd; - - if (key >= PTHREAD_KEYS_MAX) - return NULL; - idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE; - idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE; - if (THREAD_GETMEM_NC(self, p_specific[idx1st]) == NULL - || !pthread_keys[key].in_use) - return NULL; - return THREAD_GETMEM_NC(self, p_specific[idx1st])[idx2nd]; -} - -/* Call the destruction routines on all keys */ - -void __pthread_destroy_specifics() -{ - pthread_descr self = thread_self(); - int i, j, round, found_nonzero; - destr_function destr; - void * data; - - for (round = 0, found_nonzero = 1; - found_nonzero && round < PTHREAD_DESTRUCTOR_ITERATIONS; - round++) { - found_nonzero = 0; - for (i = 0; i < PTHREAD_KEY_1STLEVEL_SIZE; i++) - if (THREAD_GETMEM_NC(self, p_specific[i]) != NULL) - for (j = 0; j < PTHREAD_KEY_2NDLEVEL_SIZE; j++) { - destr = pthread_keys[i * PTHREAD_KEY_2NDLEVEL_SIZE + j].destr; - data = THREAD_GETMEM_NC(self, p_specific[i])[j]; - if (destr != NULL && data != NULL) { - THREAD_GETMEM_NC(self, p_specific[i])[j] = NULL; - destr(data); - found_nonzero = 1; - } - } - } - __pthread_lock(THREAD_GETMEM(self, p_lock), self); - for (i = 0; i < PTHREAD_KEY_1STLEVEL_SIZE; i++) { - if (THREAD_GETMEM_NC(self, p_specific[i]) != NULL) { - free(THREAD_GETMEM_NC(self, p_specific[i])); - THREAD_SETMEM_NC(self, p_specific[i], NULL); - } - } - __pthread_unlock(THREAD_GETMEM(self, p_lock)); -} - - -/* Thread-specific data for libc. */ -#if !(USE_TLS && HAVE___THREAD) -static int -libc_internal_tsd_set(enum __libc_tsd_key_t key, const void * pointer) -{ - pthread_descr self = thread_self(); - - THREAD_SETMEM_NC(self, p_libc_specific[key], (void *) pointer); - return 0; -} -int (*__libc_internal_tsd_set)(enum __libc_tsd_key_t key, const void * pointer) - = libc_internal_tsd_set; - -static void * -libc_internal_tsd_get(enum __libc_tsd_key_t key) -{ - pthread_descr self = thread_self(); - - return THREAD_GETMEM_NC(self, p_libc_specific[key]); -} -void * (*__libc_internal_tsd_get)(enum __libc_tsd_key_t key) - = libc_internal_tsd_get; - -static void ** __attribute__ ((__const__)) -libc_internal_tsd_address (enum __libc_tsd_key_t key) -{ - pthread_descr self = thread_self(); - return &self->p_libc_specific[key]; -} -void **(*const __libc_internal_tsd_address) (enum __libc_tsd_key_t key) - __THROW __attribute__ ((__const__)) = libc_internal_tsd_address; -#endif diff --git a/libpthread/linuxthreads/spinlock.c b/libpthread/linuxthreads/spinlock.c deleted file mode 100644 index cdf45f195..000000000 --- a/libpthread/linuxthreads/spinlock.c +++ /dev/null @@ -1,723 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1998 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -/* Internal locks */ - -#define __FORCE_GLIBC -#include <features.h> -#include <errno.h> -#include <sched.h> -#include <time.h> -#include <stdlib.h> -#include <limits.h> -#include "pthread.h" -#include "internals.h" -#include "spinlock.h" -#include "restart.h" - -static void __pthread_acquire(int * spinlock); - -static inline void __pthread_release(int * spinlock) -{ - WRITE_MEMORY_BARRIER(); - *spinlock = __LT_SPINLOCK_INIT; - __asm __volatile ("" : "=m" (*spinlock) : "m" (*spinlock)); -} - - -/* The status field of a spinlock is a pointer whose least significant - bit is a locked flag. - - Thus the field values have the following meanings: - - status == 0: spinlock is free - status == 1: spinlock is taken; no thread is waiting on it - - (status & 1) == 1: spinlock is taken and (status & ~1L) is a - pointer to the first waiting thread; other - waiting threads are linked via the p_nextlock - field. - (status & 1) == 0: same as above, but spinlock is not taken. - - The waiting list is not sorted by priority order. - Actually, we always insert at top of list (sole insertion mode - that can be performed without locking). - For __pthread_unlock, we perform a linear search in the list - to find the highest-priority, oldest waiting thread. - This is safe because there are no concurrent __pthread_unlock - operations -- only the thread that locked the mutex can unlock it. */ - - -void internal_function __pthread_lock(struct _pthread_fastlock * lock, - pthread_descr self) -{ -#if defined HAS_COMPARE_AND_SWAP - long oldstatus, newstatus; - int successful_seizure, spurious_wakeup_count; - int spin_count; -#endif - -#if defined TEST_FOR_COMPARE_AND_SWAP - if (!__pthread_has_cas) -#endif -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - { - __pthread_acquire(&lock->__spinlock); - return; - } -#endif - -#if defined HAS_COMPARE_AND_SWAP - /* First try it without preparation. Maybe it's a completely - uncontested lock. */ - if (lock->__status == 0 && __compare_and_swap (&lock->__status, 0, 1)) - return; - - spurious_wakeup_count = 0; - spin_count = 0; - - /* On SMP, try spinning to get the lock. */ -#if 0 - if (__pthread_smp_kernel) { - int max_count = lock->__spinlock * 2 + 10; - - if (max_count > MAX_ADAPTIVE_SPIN_COUNT) - max_count = MAX_ADAPTIVE_SPIN_COUNT; - - for (spin_count = 0; spin_count < max_count; spin_count++) { - if (((oldstatus = lock->__status) & 1) == 0) { - if(__compare_and_swap(&lock->__status, oldstatus, oldstatus | 1)) - { - if (spin_count) - lock->__spinlock += (spin_count - lock->__spinlock) / 8; - READ_MEMORY_BARRIER(); - return; - } - } -#ifdef BUSY_WAIT_NOP - BUSY_WAIT_NOP; -#endif - __asm __volatile ("" : "=m" (lock->__status) : "m" (lock->__status)); - } - - lock->__spinlock += (spin_count - lock->__spinlock) / 8; - } -#endif - -again: - - /* No luck, try once more or suspend. */ - - do { - oldstatus = lock->__status; - successful_seizure = 0; - - if ((oldstatus & 1) == 0) { - newstatus = oldstatus | 1; - successful_seizure = 1; - } else { - if (self == NULL) - self = thread_self(); - newstatus = (long) self | 1; - } - - if (self != NULL) { - THREAD_SETMEM(self, p_nextlock, (pthread_descr) (oldstatus)); - /* Make sure the store in p_nextlock completes before performing - the compare-and-swap */ - MEMORY_BARRIER(); - } - } while(! __compare_and_swap(&lock->__status, oldstatus, newstatus)); - - /* Suspend with guard against spurious wakeup. - This can happen in pthread_cond_timedwait_relative, when the thread - wakes up due to timeout and is still on the condvar queue, and then - locks the queue to remove itself. At that point it may still be on the - queue, and may be resumed by a condition signal. */ - - if (!successful_seizure) { - for (;;) { - suspend(self); - if (self->p_nextlock != NULL) { - /* Count resumes that don't belong to us. */ - spurious_wakeup_count++; - continue; - } - break; - } - goto again; - } - - /* Put back any resumes we caught that don't belong to us. */ - while (spurious_wakeup_count--) - restart(self); - - READ_MEMORY_BARRIER(); -#endif -} - -int __pthread_unlock(struct _pthread_fastlock * lock) -{ -#if defined HAS_COMPARE_AND_SWAP - long oldstatus; - pthread_descr thr, * ptr, * maxptr; - int maxprio; -#endif - -#if defined TEST_FOR_COMPARE_AND_SWAP - if (!__pthread_has_cas) -#endif -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - { - __pthread_release(&lock->__spinlock); - return 0; - } -#endif - -#if defined HAS_COMPARE_AND_SWAP - WRITE_MEMORY_BARRIER(); - -again: - while ((oldstatus = lock->__status) == 1) { - if (__compare_and_swap_with_release_semantics(&lock->__status, - oldstatus, 0)) - return 0; - } - - /* Find thread in waiting queue with maximal priority */ - ptr = (pthread_descr *) &lock->__status; - thr = (pthread_descr) (oldstatus & ~1L); - maxprio = 0; - maxptr = ptr; - - /* Before we iterate over the wait queue, we need to execute - a read barrier, otherwise we may read stale contents of nodes that may - just have been inserted by other processors. One read barrier is enough to - ensure we have a stable list; we don't need one for each pointer chase - through the list, because we are the owner of the lock; other threads - can only add nodes at the front; if a front node is consistent, - the ones behind it must also be. */ - - READ_MEMORY_BARRIER(); - - while (thr != 0) { - if (thr->p_priority >= maxprio) { - maxptr = ptr; - maxprio = thr->p_priority; - } - ptr = &(thr->p_nextlock); - thr = (pthread_descr)((long)(thr->p_nextlock) & ~1L); - } - - /* Remove max prio thread from waiting list. */ - if (maxptr == (pthread_descr *) &lock->__status) { - /* If max prio thread is at head, remove it with compare-and-swap - to guard against concurrent lock operation. This removal - also has the side effect of marking the lock as released - because the new status comes from thr->p_nextlock whose - least significant bit is clear. */ - thr = (pthread_descr) (oldstatus & ~1L); - if (! __compare_and_swap_with_release_semantics - (&lock->__status, oldstatus, (long)(thr->p_nextlock) & ~1L)) - goto again; - } else { - /* No risk of concurrent access, remove max prio thread normally. - But in this case we must also flip the least significant bit - of the status to mark the lock as released. */ - thr = (pthread_descr)((long)*maxptr & ~1L); - *maxptr = thr->p_nextlock; - - /* Ensure deletion from linked list completes before we - release the lock. */ - WRITE_MEMORY_BARRIER(); - - do { - oldstatus = lock->__status; - } while (!__compare_and_swap_with_release_semantics(&lock->__status, - oldstatus, oldstatus & ~1L)); - } - - /* Wake up the selected waiting thread. Woken thread can check - its own p_nextlock field for NULL to detect that it has been removed. No - barrier is needed here, since restart() and suspend() take - care of memory synchronization. */ - - thr->p_nextlock = NULL; - restart(thr); - - return 0; -#endif -} - -/* - * Alternate fastlocks do not queue threads directly. Instead, they queue - * these wait queue node structures. When a timed wait wakes up due to - * a timeout, it can leave its wait node in the queue (because there - * is no safe way to remove from the quue). Some other thread will - * deallocate the abandoned node. - */ - - -struct wait_node { - struct wait_node *next; /* Next node in null terminated linked list */ - pthread_descr thr; /* The thread waiting with this node */ - int abandoned; /* Atomic flag */ -}; - -static long wait_node_free_list; -static int wait_node_free_list_spinlock; - -/* Allocate a new node from the head of the free list using an atomic - operation, or else using malloc if that list is empty. A fundamental - assumption here is that we can safely access wait_node_free_list->next. - That's because we never free nodes once we allocate them, so a pointer to a - node remains valid indefinitely. */ - -static struct wait_node *wait_node_alloc(void) -{ - struct wait_node *new_node = 0; - - __pthread_acquire(&wait_node_free_list_spinlock); - if (wait_node_free_list != 0) { - new_node = (struct wait_node *) wait_node_free_list; - wait_node_free_list = (long) new_node->next; - } - WRITE_MEMORY_BARRIER(); - __pthread_release(&wait_node_free_list_spinlock); - - if (new_node == 0) - return malloc(sizeof *wait_node_alloc()); - - return new_node; -} - -/* Return a node to the head of the free list using an atomic - operation. */ - -static void wait_node_free(struct wait_node *wn) -{ - __pthread_acquire(&wait_node_free_list_spinlock); - wn->next = (struct wait_node *) wait_node_free_list; - wait_node_free_list = (long) wn; - WRITE_MEMORY_BARRIER(); - __pthread_release(&wait_node_free_list_spinlock); - return; -} - -#if defined HAS_COMPARE_AND_SWAP - -/* Remove a wait node from the specified queue. It is assumed - that the removal takes place concurrently with only atomic insertions at the - head of the queue. */ - -static void wait_node_dequeue(struct wait_node **pp_head, - struct wait_node **pp_node, - struct wait_node *p_node) -{ - /* If the node is being deleted from the head of the - list, it must be deleted using atomic compare-and-swap. - Otherwise it can be deleted in the straightforward way. */ - - if (pp_node == pp_head) { - /* We don't need a read barrier between these next two loads, - because it is assumed that the caller has already ensured - the stability of *p_node with respect to p_node. */ - - long oldvalue = (long) p_node; - long newvalue = (long) p_node->next; - - if (__compare_and_swap((long *) pp_node, oldvalue, newvalue)) - return; - - /* Oops! Compare and swap failed, which means the node is - no longer first. We delete it using the ordinary method. But we don't - know the identity of the node which now holds the pointer to the node - being deleted, so we must search from the beginning. */ - - for (pp_node = pp_head; p_node != *pp_node; ) { - pp_node = &(*pp_node)->next; - READ_MEMORY_BARRIER(); /* Stabilize *pp_node for next iteration. */ - } - } - - *pp_node = p_node->next; - return; -} - -#endif - -void __pthread_alt_lock(struct _pthread_fastlock * lock, - pthread_descr self) -{ -#if defined HAS_COMPARE_AND_SWAP - long oldstatus, newstatus; -#endif - struct wait_node wait_node; - -#if defined TEST_FOR_COMPARE_AND_SWAP - if (!__pthread_has_cas) -#endif -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - { - int suspend_needed = 0; - __pthread_acquire(&lock->__spinlock); - - if (lock->__status == 0) - lock->__status = 1; - else { - if (self == NULL) - self = thread_self(); - - wait_node.abandoned = 0; - wait_node.next = (struct wait_node *) lock->__status; - wait_node.thr = self; - lock->__status = (long) &wait_node; - suspend_needed = 1; - } - - __pthread_release(&lock->__spinlock); - - if (suspend_needed) - suspend (self); - return; - } -#endif - -#if defined HAS_COMPARE_AND_SWAP - do { - oldstatus = lock->__status; - if (oldstatus == 0) { - newstatus = 1; - } else { - if (self == NULL) - self = thread_self(); - wait_node.thr = self; - newstatus = (long) &wait_node; - } - wait_node.abandoned = 0; - wait_node.next = (struct wait_node *) oldstatus; - /* Make sure the store in wait_node.next completes before performing - the compare-and-swap */ - MEMORY_BARRIER(); - } while(! __compare_and_swap(&lock->__status, oldstatus, newstatus)); - - /* Suspend. Note that unlike in __pthread_lock, we don't worry - here about spurious wakeup. That's because this lock is not - used in situations where that can happen; the restart can - only come from the previous lock owner. */ - - if (oldstatus != 0) - suspend(self); - - READ_MEMORY_BARRIER(); -#endif -} - -/* Timed-out lock operation; returns 0 to indicate timeout. */ - -int __pthread_alt_timedlock(struct _pthread_fastlock * lock, - pthread_descr self, const struct timespec *abstime) -{ - long oldstatus = 0; -#if defined HAS_COMPARE_AND_SWAP - long newstatus; -#endif - struct wait_node *p_wait_node = wait_node_alloc(); - - /* Out of memory, just give up and do ordinary lock. */ - if (p_wait_node == 0) { - __pthread_alt_lock(lock, self); - return 1; - } - -#if defined TEST_FOR_COMPARE_AND_SWAP - if (!__pthread_has_cas) -#endif -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - { - __pthread_acquire(&lock->__spinlock); - - if (lock->__status == 0) - lock->__status = 1; - else { - if (self == NULL) - self = thread_self(); - - p_wait_node->abandoned = 0; - p_wait_node->next = (struct wait_node *) lock->__status; - p_wait_node->thr = self; - lock->__status = (long) p_wait_node; - oldstatus = 1; /* force suspend */ - } - - __pthread_release(&lock->__spinlock); - goto suspend; - } -#endif - -#if defined HAS_COMPARE_AND_SWAP - do { - oldstatus = lock->__status; - if (oldstatus == 0) { - newstatus = 1; - } else { - if (self == NULL) - self = thread_self(); - p_wait_node->thr = self; - newstatus = (long) p_wait_node; - } - p_wait_node->abandoned = 0; - p_wait_node->next = (struct wait_node *) oldstatus; - /* Make sure the store in wait_node.next completes before performing - the compare-and-swap */ - MEMORY_BARRIER(); - } while(! __compare_and_swap(&lock->__status, oldstatus, newstatus)); -#endif - -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - suspend: -#endif - - /* If we did not get the lock, do a timed suspend. If we wake up due - to a timeout, then there is a race; the old lock owner may try - to remove us from the queue. This race is resolved by us and the owner - doing an atomic testandset() to change the state of the wait node from 0 - to 1. If we succeed, then it's a timeout and we abandon the node in the - queue. If we fail, it means the owner gave us the lock. */ - - if (oldstatus != 0) { - if (timedsuspend(self, abstime) == 0) { - if (!testandset(&p_wait_node->abandoned)) - return 0; /* Timeout! */ - - /* Eat oustanding resume from owner, otherwise wait_node_free() below - will race with owner's wait_node_dequeue(). */ - suspend(self); - } - } - - wait_node_free(p_wait_node); - - READ_MEMORY_BARRIER(); - - return 1; /* Got the lock! */ -} - -void __pthread_alt_unlock(struct _pthread_fastlock *lock) -{ - struct wait_node *p_node, **pp_node, *p_max_prio, **pp_max_prio; - struct wait_node ** const pp_head = (struct wait_node **) &lock->__status; - int maxprio; - - WRITE_MEMORY_BARRIER(); - -#if defined TEST_FOR_COMPARE_AND_SWAP - if (!__pthread_has_cas) -#endif -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - { - __pthread_acquire(&lock->__spinlock); - } -#endif - - while (1) { - - /* If no threads are waiting for this lock, try to just - atomically release it. */ -#if defined TEST_FOR_COMPARE_AND_SWAP - if (!__pthread_has_cas) -#endif -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - { - if (lock->__status == 0 || lock->__status == 1) { - lock->__status = 0; - break; - } - } -#endif - -#if defined TEST_FOR_COMPARE_AND_SWAP - else -#endif - -#if defined HAS_COMPARE_AND_SWAP - { - long oldstatus = lock->__status; - if (oldstatus == 0 || oldstatus == 1) { - if (__compare_and_swap_with_release_semantics (&lock->__status, oldstatus, 0)) - break; - else - continue; - } - } -#endif - - /* Process the entire queue of wait nodes. Remove all abandoned - wait nodes and put them into the global free queue, and - remember the one unabandoned node which refers to the thread - having the highest priority. */ - - pp_max_prio = pp_node = pp_head; - p_max_prio = p_node = *pp_head; - maxprio = INT_MIN; - - READ_MEMORY_BARRIER(); /* Prevent access to stale data through p_node */ - - while (p_node != (struct wait_node *) 1) { - int prio; - - if (p_node->abandoned) { - /* Remove abandoned node. */ -#if defined TEST_FOR_COMPARE_AND_SWAP - if (!__pthread_has_cas) -#endif -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - *pp_node = p_node->next; -#endif -#if defined TEST_FOR_COMPARE_AND_SWAP - else -#endif -#if defined HAS_COMPARE_AND_SWAP - wait_node_dequeue(pp_head, pp_node, p_node); -#endif - wait_node_free(p_node); - /* Note that the next assignment may take us to the beginning - of the queue, to newly inserted nodes, if pp_node == pp_head. - In that case we need a memory barrier to stabilize the first of - these new nodes. */ - p_node = *pp_node; - if (pp_node == pp_head) - READ_MEMORY_BARRIER(); /* No stale reads through p_node */ - continue; - } else if ((prio = p_node->thr->p_priority) >= maxprio) { - /* Otherwise remember it if its thread has a higher or equal priority - compared to that of any node seen thus far. */ - maxprio = prio; - pp_max_prio = pp_node; - p_max_prio = p_node; - } - - /* This canno6 jump backward in the list, so no further read - barrier is needed. */ - pp_node = &p_node->next; - p_node = *pp_node; - } - - /* If all threads abandoned, go back to top */ - if (maxprio == INT_MIN) - continue; - - ASSERT (p_max_prio != (struct wait_node *) 1); - - /* Now we want to to remove the max priority thread's wait node from - the list. Before we can do this, we must atomically try to change the - node's abandon state from zero to nonzero. If we succeed, that means we - have the node that we will wake up. If we failed, then it means the - thread timed out and abandoned the node in which case we repeat the - whole unlock operation. */ - - if (!testandset(&p_max_prio->abandoned)) { -#if defined TEST_FOR_COMPARE_AND_SWAP - if (!__pthread_has_cas) -#endif -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - *pp_max_prio = p_max_prio->next; -#endif -#if defined TEST_FOR_COMPARE_AND_SWAP - else -#endif -#if defined HAS_COMPARE_AND_SWAP - wait_node_dequeue(pp_head, pp_max_prio, p_max_prio); -#endif - restart(p_max_prio->thr); - break; - } - } - -#if defined TEST_FOR_COMPARE_AND_SWAP - if (!__pthread_has_cas) -#endif -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - { - __pthread_release(&lock->__spinlock); - } -#endif -} - - -/* Compare-and-swap emulation with a spinlock */ - -#ifdef TEST_FOR_COMPARE_AND_SWAP -int __pthread_has_cas = 0; -#endif - -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - -int __pthread_compare_and_swap(long * ptr, long oldval, long newval, - int * spinlock) -{ - int res; - - __pthread_acquire(spinlock); - - if (*ptr == oldval) { - *ptr = newval; res = 1; - } else { - res = 0; - } - - __pthread_release(spinlock); - - return res; -} - -#endif - -/* The retry strategy is as follows: - - We test and set the spinlock MAX_SPIN_COUNT times, calling - sched_yield() each time. This gives ample opportunity for other - threads with priority >= our priority to make progress and - release the spinlock. - - If a thread with priority < our priority owns the spinlock, - calling sched_yield() repeatedly is useless, since we're preventing - the owning thread from making progress and releasing the spinlock. - So, after MAX_SPIN_LOCK attemps, we suspend the calling thread - using nanosleep(). This again should give time to the owning thread - for releasing the spinlock. - Notice that the nanosleep() interval must not be too small, - since the kernel does busy-waiting for short intervals in a realtime - process (!). The smallest duration that guarantees thread - suspension is currently 2ms. - - When nanosleep() returns, we try again, doing MAX_SPIN_COUNT - sched_yield(), then sleeping again if needed. */ - -static void __pthread_acquire(int * spinlock) -{ - int cnt = 0; - struct timespec tm; - - READ_MEMORY_BARRIER(); - - while (testandset(spinlock)) { - if (cnt < MAX_SPIN_COUNT) { - sched_yield(); - cnt++; - } else { - tm.tv_sec = 0; - tm.tv_nsec = SPIN_SLEEP_DURATION; - nanosleep(&tm, NULL); - cnt = 0; - } - } -} diff --git a/libpthread/linuxthreads/spinlock.h b/libpthread/linuxthreads/spinlock.h deleted file mode 100644 index 0ec40c57c..000000000 --- a/libpthread/linuxthreads/spinlock.h +++ /dev/null @@ -1,218 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1998 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -#include <bits/initspin.h> - - -/* There are 2 compare and swap synchronization primitives with - different semantics: - - 1. compare_and_swap, which has acquire semantics (i.e. it - completes befor subsequent writes.) - 2. compare_and_swap_with_release_semantics, which has release - semantics (it completes after previous writes.) - - For those platforms on which they are the same. HAS_COMPARE_AND_SWAP - should be defined. For those platforms on which they are different, - HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS has to be defined. */ - -#ifndef HAS_COMPARE_AND_SWAP -#ifdef HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS -#define HAS_COMPARE_AND_SWAP -#endif -#endif - -#if defined(TEST_FOR_COMPARE_AND_SWAP) - -extern int __pthread_has_cas; -extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval, - int * spinlock); - -static inline int compare_and_swap(long * ptr, long oldval, long newval, - int * spinlock) -{ - if (__builtin_expect (__pthread_has_cas, 1)) - return __compare_and_swap(ptr, oldval, newval); - else - return __pthread_compare_and_swap(ptr, oldval, newval, spinlock); -} - -#elif defined(HAS_COMPARE_AND_SWAP) - -#ifdef IMPLEMENT_TAS_WITH_CAS -#define testandset(p) !__compare_and_swap((long int *) p, 0, 1) -#endif - -#ifdef HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS - -static inline int -compare_and_swap_with_release_semantics (long * ptr, long oldval, - long newval, int * spinlock) -{ - return __compare_and_swap_with_release_semantics (ptr, oldval, - newval); -} - -#endif - -static inline int compare_and_swap(long * ptr, long oldval, long newval, - int * spinlock) -{ - return __compare_and_swap(ptr, oldval, newval); -} - -#else - -extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval, - int * spinlock); - -static inline int compare_and_swap(long * ptr, long oldval, long newval, - int * spinlock) -{ - return __pthread_compare_and_swap(ptr, oldval, newval, spinlock); -} - -#endif - -#ifndef HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS -#define compare_and_swap_with_release_semantics compare_and_swap -#define __compare_and_swap_with_release_semantics __compare_and_swap -#endif - -/* Internal locks */ - -extern void internal_function __pthread_lock(struct _pthread_fastlock * lock, - pthread_descr self); -extern int __pthread_unlock(struct _pthread_fastlock *lock); - -static inline void __pthread_init_lock(struct _pthread_fastlock * lock) -{ - lock->__status = 0; - lock->__spinlock = __LT_SPINLOCK_INIT; -} - -static inline int __pthread_trylock (struct _pthread_fastlock * lock) -{ -#if defined TEST_FOR_COMPARE_AND_SWAP - if (!__pthread_has_cas) -#endif -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - { - return (testandset(&lock->__spinlock) ? EBUSY : 0); - } -#endif - -#if defined HAS_COMPARE_AND_SWAP - do { - if (lock->__status != 0) return EBUSY; - } while(! __compare_and_swap(&lock->__status, 0, 1)); - return 0; -#endif -} - -/* Variation of internal lock used for pthread_mutex_t, supporting - timed-out waits. Warning: do not mix these operations with the above ones - over the same lock object! */ - -extern void __pthread_alt_lock(struct _pthread_fastlock * lock, - pthread_descr self); - -extern int __pthread_alt_timedlock(struct _pthread_fastlock * lock, - pthread_descr self, const struct timespec *abstime); - -extern void __pthread_alt_unlock(struct _pthread_fastlock *lock); - -static inline void __pthread_alt_init_lock(struct _pthread_fastlock * lock) -{ - lock->__status = 0; - lock->__spinlock = __LT_SPINLOCK_INIT; -} - -static inline int __pthread_alt_trylock (struct _pthread_fastlock * lock) -{ -#if defined TEST_FOR_COMPARE_AND_SWAP - if (!__pthread_has_cas) -#endif -#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP - { - int res = EBUSY; - - if (testandset(&lock->__spinlock) == 0) - { - if (lock->__status == 0) - { - lock->__status = 1; - WRITE_MEMORY_BARRIER(); - res = 0; - } - lock->__spinlock = __LT_SPINLOCK_INIT; - } - return res; - } -#endif - -#if defined HAS_COMPARE_AND_SWAP - do { - if (lock->__status != 0) return EBUSY; - } while(! compare_and_swap(&lock->__status, 0, 1, &lock->__spinlock)); - return 0; -#endif -} - -/* Operations on pthread_atomic, which is defined in internals.h */ - -static inline long atomic_increment(struct pthread_atomic *pa) -{ - long oldval; - - do { - oldval = pa->p_count; - } while (!compare_and_swap(&pa->p_count, oldval, oldval + 1, &pa->p_spinlock)); - - return oldval; -} - - -static inline long atomic_decrement(struct pthread_atomic *pa) -{ - long oldval; - - do { - oldval = pa->p_count; - } while (!compare_and_swap(&pa->p_count, oldval, oldval - 1, &pa->p_spinlock)); - - return oldval; -} - - -static inline void -__pthread_set_own_extricate_if (pthread_descr self, pthread_extricate_if *peif) -{ - /* Only store a non-null peif if the thread has cancellation enabled. - Otherwise pthread_cancel will unconditionally call the extricate handler, - and restart the thread giving rise to forbidden spurious wakeups. */ - if (peif == NULL - || THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) - { - /* If we are removing the extricate interface, we need to synchronize - against pthread_cancel so that it does not continue with a pointer - to a deallocated pthread_extricate_if struct! The thread lock - is (ab)used for this synchronization purpose. */ - if (peif == NULL) - __pthread_lock (THREAD_GETMEM(self, p_lock), self); - THREAD_SETMEM(self, p_extricate, peif); - if (peif == NULL) - __pthread_unlock (THREAD_GETMEM(self, p_lock)); - } -} diff --git a/libpthread/linuxthreads/sysdeps/alpha/pt-machine.h b/libpthread/linuxthreads/sysdeps/alpha/pt-machine.h deleted file mode 100644 index 853ac6f04..000000000 --- a/libpthread/linuxthreads/sysdeps/alpha/pt-machine.h +++ /dev/null @@ -1,128 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - Alpha version. - Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003 - Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Richard Henderson <rth@tamu.edu>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef PT_EI -# define PT_EI extern inline __attribute__ ((always_inline)) -#endif - -#ifdef __linux__ -# include <asm/pal.h> -#else -# include <machine/pal.h> -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME stack_pointer -register char *stack_pointer __asm__("$30"); - - -/* Memory barrier; default is to do nothing */ -#define MEMORY_BARRIER() __asm__ __volatile__("mb" : : : "memory") -/* Write barrier. */ -#define WRITE_MEMORY_BARRIER() __asm__ __volatile__("wmb" : : : "memory") - - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - long int ret, temp; - - __asm__ __volatile__( - "/* Inline spinlock test & set */\n" - "1:\t" - "ldl_l %0,%3\n\t" - "bne %0,2f\n\t" - "or $31,1,%1\n\t" - "stl_c %1,%2\n\t" - "beq %1,1b\n" - "2:\tmb\n" - "/* End spinlock test & set */" - : "=&r"(ret), "=&r"(temp), "=m"(*spinlock) - : "m"(*spinlock) - : "memory"); - - return ret; -} - - -/* Begin allocating thread stacks at this address. Default is to allocate - them just below the initial program stack. */ -#define THREAD_STACK_START_ADDRESS 0x40000000000 - - -/* Return the thread descriptor for the current thread. */ -#define THREAD_SELF \ -({ \ - register pthread_descr __self __asm__("$0"); \ - __asm__ ("call_pal %1" : "=r"(__self) : "i"(PAL_rduniq)); \ - __self; \ -}) - -/* Initialize the thread-unique value. */ -#define INIT_THREAD_SELF(descr, nr) \ -{ \ - register pthread_descr __self __asm__("$16") = (descr); \ - __asm__ __volatile__ ("call_pal %1" : : "r"(__self), "i"(PAL_wruniq)); \ -} - - -/* Compare-and-swap for semaphores. */ - -#define HAS_COMPARE_AND_SWAP -PT_EI int -__compare_and_swap (long int *p, long int oldval, long int newval) -{ - long int ret; - - __asm__ __volatile__ ( - "/* Inline compare & swap */\n" - "1:\t" - "ldq_l %0,%4\n\t" - "cmpeq %0,%2,%0\n\t" - "beq %0,2f\n\t" - "mov %3,%0\n\t" - "stq_c %0,%1\n\t" - "beq %0,1b\n\t" - "2:\tmb\n" - "/* End compare & swap */" - : "=&r"(ret), "=m"(*p) - : "r"(oldval), "r"(newval), "m"(*p) - : "memory"); - - return ret; -} - -/* We want the OS to assign stack addresses. */ -#define FLOATING_STACKS 1 - -/* Maximum size of the stack if the rlimit is unlimited. */ -#define ARCH_STACK_MAX_SIZE 32*1024*1024 - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/arm/pt-machine.h b/libpthread/linuxthreads/sysdeps/arm/pt-machine.h deleted file mode 100644 index 284567970..000000000 --- a/libpthread/linuxthreads/sysdeps/arm/pt-machine.h +++ /dev/null @@ -1,70 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - ARM version. - Copyright (C) 1997, 1998, 2000, 2002 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Philip Blundell <philb@gnu.org>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef PT_EI -# define PT_EI extern inline -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - -/* This will not work on ARM1 or ARM2 because SWP is lacking on those - machines. Unfortunately we have no way to detect this at compile - time; let's hope nobody tries to use one. */ - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - register unsigned int ret; - -#if defined(__thumb__) - void *pc; - __asm__ __volatile__( - ".align 0\n" - "\tbx pc\n" - "\tnop\n" - "\t.arm\n" - "\tswp %0, %2, [%3]\n" - "\torr %1, pc, #1\n" - "\tbx %1\n" - "\t.force_thumb" - : "=r"(ret), "=r"(pc) - : "0"(1), "r"(spinlock)); -#else - __asm__ __volatile__("swp %0, %1, [%2]" - : "=r"(ret) - : "0"(1), "r"(spinlock)); -#endif - - return ret; -} - - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME stack_pointer -register char * stack_pointer __asm__ ("sp"); - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/bfin/pt-machine.h b/libpthread/linuxthreads/sysdeps/bfin/pt-machine.h deleted file mode 100644 index fef16263e..000000000 --- a/libpthread/linuxthreads/sysdeps/bfin/pt-machine.h +++ /dev/null @@ -1,57 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - Copyright (C) 1996, 1998, 2000, 2002 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Richard Henderson <rth@tamu.edu>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If - not, write to the Free Software Foundation, Inc., - 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef PT_EI -# define PT_EI extern inline -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long *, long , long); - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - if (*spinlock) - return 1; - else - { - *spinlock=1; - return 0; - } -} - -#define HAS_COMPARE_AND_SWAP - -PT_EI int -__compare_and_swap (long int *p, long int oldval, long int newval) -{ - if((*p ^ oldval) == 0) { - *p = newval; - return 1; - } - else - return 0; -} - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/cris/pt-machine.h b/libpthread/linuxthreads/sysdeps/cris/pt-machine.h deleted file mode 100644 index 431da7101..000000000 --- a/libpthread/linuxthreads/sysdeps/cris/pt-machine.h +++ /dev/null @@ -1,58 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - CRIS version. - Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef PT_EI -# define PT_EI extern inline __attribute__ ((always_inline)) -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - -PT_EI long int -testandset (int *spinlock) -{ - register unsigned long int ret; - - /* Note the use of a dummy output of *spinlock to expose the write. The - memory barrier is to stop *other* writes being moved past this code. */ - __asm__ __volatile__("clearf\n" - "0:\n\t" - "movu.b [%2],%0\n\t" - "ax\n\t" - "move.b %3,[%2]\n\t" - "bwf 0b\n\t" - "clearf" - : "=&r" (ret), "=m" (*spinlock) - : "r" (spinlock), "r" ((int) 1) - : "memory"); - return ret; -} - - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. - I don't trust register variables, so let's do this the safe way. */ -#define CURRENT_STACK_FRAME \ - ({ char *sp; __asm__ ("move.d $sp,%0" : "=rm" (sp)); sp; }) - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/frv/pt-machine.h b/libpthread/linuxthreads/sysdeps/frv/pt-machine.h deleted file mode 100644 index 64df5ffdb..000000000 --- a/libpthread/linuxthreads/sysdeps/frv/pt-machine.h +++ /dev/null @@ -1,68 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - FR-V version. - Copyright (C) 2004 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Alexandre Oliva <aoliva@redhat.com> - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If - not, write to the Free Software Foundation, Inc., - 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef __ASSEMBLER__ - -#ifndef PT_EI -# define PT_EI extern inline __attribute__ ((always_inline)) -#endif - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - int i = 1; - asm ("swap%I0 %M0, %1" : "+m"(*(volatile int *)spinlock), "+r"(i)); - return i; -} - -/* We want the OS to assign stack addresses. */ -#define FLOATING_STACKS 1 - -/* This symbol is defined by the ABI as the stack size requested by - the main program. */ -extern char __stacksize; -#define ARCH_STACK_MAX_SIZE ((unsigned long)&__stacksize) - -/* Memory barrier; default is to do nothing */ -#define MEMORY_BARRIER() __asm__ __volatile__("membar" : : : "memory") -/* Write barrier. */ -#define WRITE_MEMORY_BARRIER() __asm__ __volatile__("membar" : : : "memory") - -/* Return the thread descriptor for the current thread. */ -register struct _pthread_descr_struct *THREAD_SELF asm ("gr29"); -#define THREAD_SELF THREAD_SELF - -/* Initialize the thread-unique value. */ -#define INIT_THREAD_SELF(descr, nr) \ - (THREAD_SELF = descr) - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME stack_pointer -register char * stack_pointer __asm__ ("sp"); - -#endif - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/i386/pt-machine.h b/libpthread/linuxthreads/sysdeps/i386/pt-machine.h deleted file mode 100644 index af1818d7b..000000000 --- a/libpthread/linuxthreads/sysdeps/i386/pt-machine.h +++ /dev/null @@ -1,158 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - i386 version. - Copyright (C) 1996-2001, 2002, 2003 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Richard Henderson <rth@tamu.edu>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef __ASSEMBLER__ -#ifndef PT_EI -# define PT_EI extern inline __attribute__ ((always_inline)) -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME __builtin_frame_address (0) - - -/* See if we can optimize for newer cpus... */ -#if defined __GNUC__ && __GNUC__ >= 2 && \ - (defined __i486__ || defined __pentium__ || defined __pentiumpro__ || defined __pentium4__ || \ - defined __athlon__ || defined __k8__) - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - long int ret; - - __asm__ __volatile__ ( - "xchgl %0, %1" - : "=r" (ret), "=m" (*spinlock) - : "0" (1), "m" (*spinlock) - : "memory"); - - return ret; -} - -/* Compare-and-swap for semaphores. It's always available on i686. */ -#define HAS_COMPARE_AND_SWAP - -PT_EI int -__compare_and_swap (long int *p, long int oldval, long int newval) -{ - char ret; - long int readval; - - __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0" - : "=q" (ret), "=m" (*p), "=a" (readval) - : "r" (newval), "m" (*p), "a" (oldval) - : "memory"); - return ret; -} - -#if __ASSUME_LDT_WORKS > 0 -#include "../useldt.h" -#endif - -/* The P4 and above really want some help to prevent overheating. */ -#define BUSY_WAIT_NOP __asm__ ("rep; nop") - - -#else /* Generic i386 implementation */ - - - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - long int ret; - - __asm__ __volatile__( - "xchgl %0, %1" - : "=r"(ret), "=m"(*spinlock) - : "0"(1), "m"(*spinlock) - : "memory"); - - return ret; -} - - -/* Compare-and-swap for semaphores. - Available on the 486 and above, but not on the 386. - We test dynamically whether it's available or not. */ - -#define HAS_COMPARE_AND_SWAP -#define TEST_FOR_COMPARE_AND_SWAP - -PT_EI int -__compare_and_swap (long int *p, long int oldval, long int newval) -{ - char ret; - long int readval; - - __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0" - : "=q" (ret), "=m" (*p), "=a" (readval) - : "r" (newval), "m" (*p), "a" (oldval) - : "memory"); - return ret; -} - - -PT_EI int -get_eflags (void) -{ - int res; - __asm__ __volatile__ ("pushfl; popl %0" : "=r" (res) : ); - return res; -} - - -PT_EI void -set_eflags (int newflags) -{ - __asm__ __volatile__ ("pushl %0; popfl" : : "r" (newflags) : "cc"); -} - - -PT_EI int -compare_and_swap_is_available (void) -{ - int oldflags = get_eflags (); - int changed; - /* Flip AC bit in EFLAGS. */ - set_eflags (oldflags ^ 0x40000); - /* See if bit changed. */ - changed = (get_eflags () ^ oldflags) & 0x40000; - /* Restore EFLAGS. */ - set_eflags (oldflags); - /* If the AC flag did not change, it's a 386 and it lacks cmpxchg. - Otherwise, it's a 486 or above and it has cmpxchg. */ - return changed != 0; -} -#endif /* Generic i386 implementation */ - -#endif /* __ASSEMBLER__ */ - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/i386/tls.h b/libpthread/linuxthreads/sysdeps/i386/tls.h deleted file mode 100644 index e4f007ee3..000000000 --- a/libpthread/linuxthreads/sysdeps/i386/tls.h +++ /dev/null @@ -1,185 +0,0 @@ -/* Definition for thread-local data handling. linuxthreads/i386 version. - Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#ifndef _TLS_H -#define _TLS_H - -# include <pt-machine.h> - -#ifndef __ASSEMBLER__ -# include <stdbool.h> -# include <stddef.h> -# include <stdint.h> - -/* Type for the dtv. */ -typedef union dtv -{ - size_t counter; - void *pointer; -} dtv_t; - - -typedef struct -{ - void *tcb; /* Pointer to the TCB. Not necessary the - thread descriptor used by libpthread. */ - dtv_t *dtv; - void *self; /* Pointer to the thread descriptor. */ -} tcbhead_t; -#endif - - -/* We can support TLS only if the floating-stack support is available. */ -#if defined FLOATING_STACKS && defined HAVE_TLS_SUPPORT - -/* Signal that TLS support is available. */ -//# define USE_TLS 1 - -# ifndef __ASSEMBLER__ -/* Get system call information. */ -# include <sysdep.h> - - -/* Get the thread descriptor definition. */ -# include <linuxthreads/descr.h> - -/* This is the size of the initial TCB. */ -# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) - -/* Alignment requirements for the initial TCB. */ -# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) - -/* This is the size of the TCB. */ -# define TLS_TCB_SIZE sizeof (struct _pthread_descr_struct) - -/* Alignment requirements for the TCB. */ -# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct) - -/* The TCB can have any size and the memory following the address the - thread pointer points to is unspecified. Allocate the TCB there. */ -# define TLS_TCB_AT_TP 1 - - -/* Install the dtv pointer. The pointer passed is to the element with - index -1 which contain the length. */ -# define INSTALL_DTV(descr, dtvp) \ - ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 - -/* Install new dtv for current thread. */ -# define INSTALL_NEW_DTV(dtv) \ - ({ struct _pthread_descr_struct *__descr; \ - THREAD_SETMEM (__descr, p_header.data.dtvp, (dtv)); }) - -/* Return dtv of given thread descriptor. */ -# define GET_DTV(descr) \ - (((tcbhead_t *) (descr))->dtv) - -# ifdef __PIC__ -# define TLS_EBX_ARG "r" -# define TLS_LOAD_EBX "xchgl %3, %%ebx\n\t" -# else -# define TLS_EBX_ARG "b" -# define TLS_LOAD_EBX -# endif - -# define TLS_DO_MODIFY_LDT(descr, nr) \ -({ \ - struct modify_ldt_ldt_s ldt_entry = \ - { nr, (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ - 1, 0, 0, 1, 0, 1, 0 }; \ - int result; \ - asm volatile (TLS_LOAD_EBX \ - "int $0x80\n\t" \ - TLS_LOAD_EBX \ - : "=a" (result) \ - : "0" (__NR_modify_ldt), \ - /* The extra argument with the "m" constraint is necessary \ - to let the compiler know that we are accessing LDT_ENTRY \ - here. */ \ - "m" (ldt_entry), TLS_EBX_ARG (1), "c" (&ldt_entry), \ - "d" (sizeof (ldt_entry))); \ - __builtin_expect (result, 0) != 0 ? -1 : nr * 8 + 7; \ -}) - -# define TLS_DO_SET_THREAD_AREA(descr, secondcall) \ -({ \ - struct modify_ldt_ldt_s ldt_entry = \ - { -1, (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ - 1, 0, 0, 1, 0, 1, 0 }; \ - int result; \ - if (secondcall) \ - ldt_entry.entry_number = ({ int _gs; \ - asm ("movw %%gs, %w0" : "=q" (_gs)); \ - (_gs & 0xffff) >> 3; }); \ - asm volatile (TLS_LOAD_EBX \ - "int $0x80\n\t" \ - TLS_LOAD_EBX \ - : "=a" (result), "=m" (ldt_entry.entry_number) \ - : "0" (__NR_set_thread_area), \ - /* The extra argument with the "m" constraint is necessary \ - to let the compiler know that we are accessing LDT_ENTRY \ - here. */ \ - TLS_EBX_ARG (&ldt_entry), "m" (ldt_entry)); \ - __builtin_expect (result, 0) == 0 ? ldt_entry.entry_number * 8 + 3 : -1; \ -}) - -# ifdef __ASSUME_SET_THREAD_AREA_SYSCALL -# define TLS_SETUP_GS_SEGMENT(descr, secondcall) \ - TLS_DO_SET_THREAD_AREA (descr, firstcall) -# elif defined __NR_set_thread_area -# define TLS_SETUP_GS_SEGMENT(descr, secondcall) \ - ({ int __seg = TLS_DO_SET_THREAD_AREA (descr, secondcall); \ - __seg == -1 ? TLS_DO_MODIFY_LDT (descr, 0) : __seg; }) -# else -# define TLS_SETUP_GS_SEGMENT(descr, secondcall) \ - TLS_DO_MODIFY_LDT ((descr), 0) -# endif - -/* Code to initially initialize the thread pointer. This might need - special attention since 'errno' is not yet available and if the - operation can cause a failure 'errno' must not be touched. */ -# define TLS_INIT_TP(descr, secondcall) \ - ({ \ - void *_descr = (descr); \ - tcbhead_t *head = _descr; \ - int __gs; \ - \ - head->tcb = _descr; \ - /* For now the thread descriptor is at the same address. */ \ - head->self = _descr; \ - \ - __gs = TLS_SETUP_GS_SEGMENT (_descr, secondcall); \ - if (__builtin_expect (__gs, 7) != -1) \ - { \ - asm ("movw %w0, %%gs" : : "q" (__gs)); \ - __gs = 0; \ - } \ - __gs; \ - }) - - -/* Return the address of the dtv for the current thread. */ -# define THREAD_DTV() \ - ({ struct _pthread_descr_struct *__descr; \ - THREAD_GETMEM (__descr, p_header.data.dtvp); }) - -# endif /* FLOATING_STACKS && HAVE_TLS_SUPPORT */ -#endif /* __ASSEMBLER__ */ - -#endif /* tls.h */ diff --git a/libpthread/linuxthreads/sysdeps/i386/useldt.h b/libpthread/linuxthreads/sysdeps/i386/useldt.h deleted file mode 100644 index 16aee9989..000000000 --- a/libpthread/linuxthreads/sysdeps/i386/useldt.h +++ /dev/null @@ -1,307 +0,0 @@ -/* Special definitions for ix86 machine using segment register based - thread descriptor. - Copyright (C) 1998, 2000, 2001, 2002 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@cygnus.com>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef __ASSEMBLER__ -#include <stddef.h> /* For offsetof. */ -#include <stdlib.h> /* For abort(). */ - - -/* We don't want to include the kernel header. So duplicate the - information. */ - -/* Structure passed on `modify_ldt' call. */ -struct modify_ldt_ldt_s -{ - unsigned int entry_number; - unsigned long int base_addr; - unsigned int limit; - unsigned int seg_32bit:1; - unsigned int contents:2; - unsigned int read_exec_only:1; - unsigned int limit_in_pages:1; - unsigned int seg_not_present:1; - unsigned int useable:1; - unsigned int empty:25; -}; - -/* System call to set LDT entry. */ -extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t); - - -/* Return the thread descriptor for the current thread. - - The contained asm must *not* be marked volatile since otherwise - assignments like - pthread_descr self = thread_self(); - do not get optimized away. */ -#define THREAD_SELF \ -({ \ - register pthread_descr __self; \ - __asm__ ("movl %%gs:%c1,%0" : "=r" (__self) \ - : "i" (offsetof (struct _pthread_descr_struct, \ - p_header.data.self))); \ - __self; \ -}) - - -/* Initialize the thread-unique value. Two possible ways to do it. */ - -#define DO_MODIFY_LDT(descr, nr) \ -({ \ - struct modify_ldt_ldt_s ldt_entry = \ - { nr, (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ - 1, 0, 0, 1, 0, 1, 0 }; \ - if (__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) \ - abort (); \ - asm ("movw %w0, %%gs" : : "q" (nr * 8 + 7)); \ -}) - -#ifdef __PIC__ -# define USETLS_EBX_ARG "r" -# define USETLS_LOAD_EBX "xchgl %3, %%ebx\n\t" -#else -# define USETLS_EBX_ARG "b" -# define USETLS_LOAD_EBX -#endif - -/* When using the new set_thread_area call, we don't need to change %gs - because we inherited the value set up in the main thread by TLS setup. - We need to extract that value and set up the same segment in this - thread. */ -#if USE_TLS -# define DO_SET_THREAD_AREA_REUSE(nr) 1 -#else -/* Without TLS, we do the initialization of the main thread, where NR == 0. */ -# define DO_SET_THREAD_AREA_REUSE(nr) (!__builtin_constant_p (nr) || (nr)) -#endif -#define DO_SET_THREAD_AREA(descr, nr) \ -({ \ - int __gs; \ - if (DO_SET_THREAD_AREA_REUSE (nr)) \ - { \ - asm ("movw %%gs, %w0" : "=q" (__gs)); \ - struct modify_ldt_ldt_s ldt_entry = \ - { (__gs & 0xffff) >> 3, \ - (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ - 1, 0, 0, 1, 0, 1, 0 }; \ - \ - int __result; \ - __asm (USETLS_LOAD_EBX \ - "movl %2, %%eax\n\t" \ - "int $0x80\n\t" \ - USETLS_LOAD_EBX \ - : "&a" (__result) \ - : USETLS_EBX_ARG (&ldt_entry), "i" (__NR_set_thread_area)); \ - if (__result == 0) \ - asm ("movw %w0, %%gs" :: "q" (__gs)); \ - else \ - __gs = -1; \ - } \ - else \ - { \ - struct modify_ldt_ldt_s ldt_entry = \ - { -1, \ - (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ - 1, 0, 0, 1, 0, 1, 0 }; \ - int __result; \ - __asm (USETLS_LOAD_EBX \ - "movl %2, %%eax\n\t" \ - "int $0x80\n\t" \ - USETLS_LOAD_EBX \ - : "&a" (__result) \ - : USETLS_EBX_ARG (&ldt_entry), "i" (__NR_set_thread_area)); \ - if (__result == 0) \ - { \ - __gs = (ldt_entry.entry_number << 3) + 3; \ - asm ("movw %w0, %%gs" : : "q" (__gs)); \ - } \ - else \ - __gs = -1; \ - } \ - __gs; \ -}) - -#if defined __ASSUME_SET_THREAD_AREA_SYSCALL -# define INIT_THREAD_SELF(descr, nr) DO_SET_THREAD_AREA (descr, nr) -#elif defined __NR_set_thread_area -# define INIT_THREAD_SELF(descr, nr) \ -({ \ - if (__builtin_expect (__have_no_set_thread_area, 0) \ - || (DO_SET_THREAD_AREA (descr, DO_SET_THREAD_AREA_REUSE (nr)) == -1 \ - && (__have_no_set_thread_area = 1))) \ - DO_MODIFY_LDT (descr, nr); \ -}) -/* Defined in pspinlock.c. */ -extern int __have_no_set_thread_area; -#else -# define INIT_THREAD_SELF(descr, nr) DO_MODIFY_LDT (descr, nr) -#endif - -/* Free resources associated with thread descriptor. */ -#ifdef __ASSUME_SET_THREAD_AREA_SYSCALL -#define FREE_THREAD(descr, nr) do { } while (0) -#elif defined __NR_set_thread_area -#define FREE_THREAD(descr, nr) \ -{ \ - int __gs; \ - __asm__ __volatile__ ("movw %%gs, %w0" : "=q" (__gs)); \ - if (__builtin_expect (__gs & 4, 0)) \ - { \ - struct modify_ldt_ldt_s ldt_entry = \ - { nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 }; \ - __modify_ldt (1, &ldt_entry, sizeof (ldt_entry)); \ - } \ -} -#else -#define FREE_THREAD(descr, nr) \ -{ \ - struct modify_ldt_ldt_s ldt_entry = \ - { nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 }; \ - __modify_ldt (1, &ldt_entry, sizeof (ldt_entry)); \ -} -#endif - -/* Read member of the thread descriptor directly. */ -#define THREAD_GETMEM(descr, member) \ -({ \ - __typeof__ (descr->member) __value; \ - if (sizeof (__value) == 1) \ - __asm__ __volatile__ ("movb %%gs:%P2,%b0" \ - : "=q" (__value) \ - : "0" (0), \ - "i" (offsetof (struct _pthread_descr_struct, \ - member))); \ - else if (sizeof (__value) == 4) \ - __asm__ __volatile__ ("movl %%gs:%P1,%0" \ - : "=r" (__value) \ - : "i" (offsetof (struct _pthread_descr_struct, \ - member))); \ - else \ - { \ - if (sizeof (__value) != 8) \ - /* There should not be any value with a size other than 1, 4 or 8. */\ - abort (); \ - \ - __asm__ __volatile__ ("movl %%gs:%P1,%%eax\n\t" \ - "movl %%gs:%P2,%%edx" \ - : "=A" (__value) \ - : "i" (offsetof (struct _pthread_descr_struct, \ - member)), \ - "i" (offsetof (struct _pthread_descr_struct, \ - member) + 4)); \ - } \ - __value; \ -}) - -/* Same as THREAD_GETMEM, but the member offset can be non-constant. */ -#define THREAD_GETMEM_NC(descr, member) \ -({ \ - __typeof__ (descr->member) __value; \ - if (sizeof (__value) == 1) \ - __asm__ __volatile__ ("movb %%gs:(%2),%b0" \ - : "=q" (__value) \ - : "0" (0), \ - "r" (offsetof (struct _pthread_descr_struct, \ - member))); \ - else if (sizeof (__value) == 4) \ - __asm__ __volatile__ ("movl %%gs:(%1),%0" \ - : "=r" (__value) \ - : "r" (offsetof (struct _pthread_descr_struct, \ - member))); \ - else \ - { \ - if (sizeof (__value) != 8) \ - /* There should not be any value with a size other than 1, 4 or 8. */\ - abort (); \ - \ - __asm__ __volatile__ ("movl %%gs:(%1),%%eax\n\t" \ - "movl %%gs:4(%1),%%edx" \ - : "=&A" (__value) \ - : "r" (offsetof (struct _pthread_descr_struct, \ - member))); \ - } \ - __value; \ -}) - -/* Same as THREAD_SETMEM, but the member offset can be non-constant. */ -#define THREAD_SETMEM(descr, member, value) \ -({ \ - __typeof__ (descr->member) __value = (value); \ - if (sizeof (__value) == 1) \ - __asm__ __volatile__ ("movb %0,%%gs:%P1" : \ - : "q" (__value), \ - "i" (offsetof (struct _pthread_descr_struct, \ - member))); \ - else if (sizeof (__value) == 4) \ - __asm__ __volatile__ ("movl %0,%%gs:%P1" : \ - : "r" (__value), \ - "i" (offsetof (struct _pthread_descr_struct, \ - member))); \ - else \ - { \ - if (sizeof (__value) != 8) \ - /* There should not be any value with a size other than 1, 4 or 8. */\ - abort (); \ - \ - __asm__ __volatile__ ("movl %%eax,%%gs:%P1\n\n" \ - "movl %%edx,%%gs:%P2" : \ - : "A" (__value), \ - "i" (offsetof (struct _pthread_descr_struct, \ - member)), \ - "i" (offsetof (struct _pthread_descr_struct, \ - member) + 4)); \ - } \ -}) - -/* Set member of the thread descriptor directly. */ -#define THREAD_SETMEM_NC(descr, member, value) \ -({ \ - __typeof__ (descr->member) __value = (value); \ - if (sizeof (__value) == 1) \ - __asm__ __volatile__ ("movb %0,%%gs:(%1)" : \ - : "q" (__value), \ - "r" (offsetof (struct _pthread_descr_struct, \ - member))); \ - else if (sizeof (__value) == 4) \ - __asm__ __volatile__ ("movl %0,%%gs:(%1)" : \ - : "r" (__value), \ - "r" (offsetof (struct _pthread_descr_struct, \ - member))); \ - else \ - { \ - if (sizeof (__value) != 8) \ - /* There should not be any value with a size other than 1, 4 or 8. */\ - abort (); \ - \ - __asm__ __volatile__ ("movl %%eax,%%gs:(%1)\n\t" \ - "movl %%edx,%%gs:4(%1)" : \ - : "A" (__value), \ - "r" (offsetof (struct _pthread_descr_struct, \ - member))); \ - } \ -}) -#endif - -/* We want the OS to assign stack addresses. */ -#define FLOATING_STACKS 1 - -/* Maximum size of the stack if the rlimit is unlimited. */ -#define ARCH_STACK_MAX_SIZE 8*1024*1024 diff --git a/libpthread/linuxthreads/sysdeps/m68k/pt-machine.h b/libpthread/linuxthreads/sysdeps/m68k/pt-machine.h deleted file mode 100644 index 4670ae3c4..000000000 --- a/libpthread/linuxthreads/sysdeps/m68k/pt-machine.h +++ /dev/null @@ -1,76 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - m68k version. - Copyright (C) 1996, 1998, 2000, 2002, 2003 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Richard Henderson <rth@tamu.edu>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If - not, write to the Free Software Foundation, Inc., - 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef PT_EI -# define PT_EI extern inline __attribute__ ((always_inline)) -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - char ret; - - __asm__ __volatile__( -#if !defined(__mcoldfire__) && !defined(__mcf5200__) && !defined(__m68000) - "tas %1; sne %0" -#else - "bset #7,%1; sne %0" -#endif - : "=dm"(ret), "=m"(*spinlock) - : "m"(*spinlock) - : "cc"); - - return ret; -} - - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME stack_pointer -register char * stack_pointer __asm__ ("%sp"); - - -/* Compare-and-swap for semaphores. */ - -#if !defined(__mcoldfire__) && !defined(__mcf5200__) && !defined(__mc68000) -#define HAS_COMPARE_AND_SWAP -PT_EI int -__compare_and_swap (long int *p, long int oldval, long int newval) -{ - char ret; - long int readval; - - __asm__ __volatile__ ("casl %2, %3, %1; seq %0" - : "=dm" (ret), "=m" (*p), "=d" (readval) - : "d" (newval), "m" (*p), "2" (oldval)); - - return ret; -} -#endif - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/mips/pt-machine.h b/libpthread/linuxthreads/sysdeps/mips/pt-machine.h deleted file mode 100644 index f7efc881d..000000000 --- a/libpthread/linuxthreads/sysdeps/mips/pt-machine.h +++ /dev/null @@ -1,110 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - - Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003, 2004 - Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ralf Baechle <ralf@gnu.org>. - Based on the Alpha version by Richard Henderson <rth@tamu.edu>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If - not, write to the Free Software Foundation, Inc., - 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#include <features.h> - -/* Copyright (C) 2000, 2002 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Maciej W. Rozycki <macro@ds2.pg.gda.pl>, 2000. */ -static inline int -_test_and_set (int *p, int v) __THROW -{ - int r, t; - - __asm__ __volatile__ - ("/* Inline test and set */\n" - "1:\n\t" - ".set push\n\t" - ".set mips2\n\t" - "ll %0,%3\n\t" - "move %1,%4\n\t" - "beq %0,%4,2f\n\t" - "sc %1,%2\n\t" - ".set pop\n\t" - "beqz %1,1b\n" - "2:\n\t" - "/* End test and set */" - : "=&r" (r), "=&r" (t), "=m" (*p) - : "m" (*p), "r" (v) - : "memory"); - - return r; -} - - -#ifndef PT_EI -# define PT_EI extern inline __attribute__ ((always_inline)) -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - - -/* Spinlock implementation; required. */ - -PT_EI long int -testandset (int *spinlock) -{ - return _test_and_set (spinlock, 1); -} - - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME stack_pointer -register char * stack_pointer __asm__ ("$29"); - - -/* Compare-and-swap for semaphores. */ - -#define HAS_COMPARE_AND_SWAP -PT_EI int -__compare_and_swap (long int *p, long int oldval, long int newval) -{ - long int ret, temp; - - __asm__ __volatile__ - ("/* Inline compare & swap */\n" - "1:\n\t" - ".set push\n\t" - ".set mips2\n\t" - "ll %1,%5\n\t" - "move %0,$0\n\t" - "bne %1,%3,2f\n\t" - "move %0,%4\n\t" - "sc %0,%2\n\t" - ".set pop\n\t" - "beqz %0,1b\n" - "2:\n\t" - "/* End compare & swap */" - : "=&r" (ret), "=&r" (temp), "=m" (*p) - : "r" (oldval), "r" (newval), "m" (*p) - : "memory"); - - return ret; -} - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/nios/pt-machine.h b/libpthread/linuxthreads/sysdeps/nios/pt-machine.h deleted file mode 100644 index 5d82b8d16..000000000 --- a/libpthread/linuxthreads/sysdeps/nios/pt-machine.h +++ /dev/null @@ -1,67 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - ARM version. - Copyright (C) 1997, 1998 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Philip Blundell <philb@gnu.org>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef PT_EI -# define PT_EI extern inline -#endif - -extern long int testandset (int *spinlock); -/* Spinlock implementation; required. */ -/* it is weird and dangerous to disable interrupt in userspace, but for nios - what else we can do before we have a swap like instruction? This is better - than nothing - */ -PT_EI long int -testandset (int *spinlock) -{ - unsigned int ret; - - __asm__ __volatile__("pfx 8\n\t" - "wrctl %1 ; disable interrupt\n\t" - "nop\n\t" - "nop\n\t" - "ld %0, [%2]\n\t" - "st [%2], %1\n\t" - "pfx 9\n\t" - "wrctl %1 ; enable interrupt\n\t" - "nop\n\t" - "nop\n\t" - : "=&r"(ret) - : "r"(1), "r"(spinlock) - : "memory"); - - return ret; -} - - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME stack_pointer -register char * stack_pointer __asm__ ("%sp"); - -/* nios needs more because of reg windows */ -#define THREAD_MANAGER_STACK_SIZE (32*1024) -#define STACK_SIZE (32*1024) - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/nios2/pt-machine.h b/libpthread/linuxthreads/sysdeps/nios2/pt-machine.h deleted file mode 100644 index 484a77e14..000000000 --- a/libpthread/linuxthreads/sysdeps/nios2/pt-machine.h +++ /dev/null @@ -1,58 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - nios2 version. - Copyright (C) 1996, 1998, 2000, 2002 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If - not, write to the Free Software Foundation, Inc., - 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef PT_EI -# define PT_EI extern inline -#endif - -extern long int testandset (int *spinlock); - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - unsigned int scratch; - long int ret=-2; - - __asm__ __volatile__( - "rdctl %0, status\n\t" - "and %0, %0, %1\n\t" - "wrctl status, %0 #disable interrupts\n\t" - "ldw %1, 0(%4)\n\t" - "stw %3, 0(%4)\n\t" - "ori %0, %0, 1\n\t" - "wrctl status, %0 #enable interrupts\n\t" - : "=&r"(scratch), "=r"(ret) - : "1"(ret), "r"(1), "r"(spinlock) - : "memory"); - - return ret; -} - - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME stack_pointer -register char * stack_pointer __asm__ ("%sp"); - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/powerpc/pt-machine.h b/libpthread/linuxthreads/sysdeps/powerpc/pt-machine.h deleted file mode 100644 index 9e6543a26..000000000 --- a/libpthread/linuxthreads/sysdeps/powerpc/pt-machine.h +++ /dev/null @@ -1,103 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - powerpc version. - Copyright (C) 1996, 1997, 1998, 2000, 2001, 2002 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If - not, write to the Free Software Foundation, Inc., - 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -/* These routines are from Appendix G of the 'PowerPC 601 RISC Microprocessor - User's Manual', by IBM and Motorola. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef PT_EI -# define PT_EI extern inline -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - -/* For multiprocessor systems, we want to ensure all memory accesses - are completed before we reset a lock. On other systems, we still - need to make sure that the compiler has flushed everything to memory. */ -#define MEMORY_BARRIER() __asm__ __volatile__ ("sync" : : : "memory") - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME stack_pointer -register char * stack_pointer __asm__ ("r1"); - -/* Register r2 (tp) is reserved by the ABI as "thread pointer". */ -struct _pthread_descr_struct; -register struct _pthread_descr_struct *__thread_self __asm__("r2"); - -/* Return the thread descriptor for the current thread. */ -#define THREAD_SELF __thread_self - -/* Initialize the thread-unique value. */ -#define INIT_THREAD_SELF(descr, nr) (__thread_self = (descr)) - -/* Compare-and-swap for semaphores. */ -/* note that test-and-set(x) is the same as !compare-and-swap(x, 0, 1) */ - -#define HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS -#define IMPLEMENT_TAS_WITH_CAS - -PT_EI int -__compare_and_swap (long int *p, long int oldval, long int newval) -{ - int ret; - - __asm__ __volatile__ ( - "0: lwarx %0,0,%1 ;" - " xor. %0,%3,%0;" - " bne 1f;" - " stwcx. %2,0,%1;" - " bne- 0b;" - "1: " - : "=&r"(ret) - : "r"(p), "r"(newval), "r"(oldval) - : "cr0", "memory"); - /* This version of __compare_and_swap is to be used when acquiring - a lock, so we don't need to worry about whether other memory - operations have completed, but we do need to be sure that any loads - after this point really occur after we have acquired the lock. */ - __asm__ __volatile__ ("isync" : : : "memory"); - return ret == 0; -} - -PT_EI int -__compare_and_swap_with_release_semantics (long int *p, - long int oldval, long int newval) -{ - int ret; - - MEMORY_BARRIER (); - __asm__ __volatile__ ( - "0: lwarx %0,0,%1 ;" - " xor. %0,%3,%0;" - " bne 1f;" - " stwcx. %2,0,%1;" - " bne- 0b;" - "1: " - : "=&r"(ret) - : "r"(p), "r"(newval), "r"(oldval) - : "cr0", "memory"); - return ret == 0; -} - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/pthread/bits/libc-lock.h b/libpthread/linuxthreads/sysdeps/pthread/bits/libc-lock.h deleted file mode 100644 index e2b267d32..000000000 --- a/libpthread/linuxthreads/sysdeps/pthread/bits/libc-lock.h +++ /dev/null @@ -1,328 +0,0 @@ -/* libc-internal interface for mutex locks. LinuxThreads version. - Copyright (C) 1996,1997,1998,1999,2000,2001,2002,2003 - Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef _BITS_LIBC_LOCK_H -#define _BITS_LIBC_LOCK_H 1 - -#include <pthread.h> - -/* Mutex type. */ -#if defined(_LIBC) || defined(_IO_MTSAFE_IO) -typedef pthread_mutex_t __libc_lock_t; -typedef struct { pthread_mutex_t mutex; } __libc_lock_recursive_t; -# ifdef __USE_UNIX98 -typedef pthread_rwlock_t __libc_rwlock_t; -# else -typedef struct __libc_rwlock_opaque__ __libc_rwlock_t; -# endif -#else -typedef struct __libc_lock_opaque__ __libc_lock_t; -typedef struct __libc_lock_recursive_opaque__ __libc_lock_recursive_t; -typedef struct __libc_rwlock_opaque__ __libc_rwlock_t; -#endif - -/* Type for key to thread-specific data. */ -typedef pthread_key_t __libc_key_t; - -/* Define a lock variable NAME with storage class CLASS. The lock must be - initialized with __libc_lock_init before it can be used (or define it - with __libc_lock_define_initialized, below). Use `extern' for CLASS to - declare a lock defined in another module. In public structure - definitions you must use a pointer to the lock structure (i.e., NAME - begins with a `*'), because its storage size will not be known outside - of libc. */ -#define __libc_lock_define(CLASS,NAME) \ - CLASS __libc_lock_t NAME; -#define __libc_rwlock_define(CLASS,NAME) \ - CLASS __libc_rwlock_t NAME; -#define __libc_lock_define_recursive(CLASS,NAME) \ - CLASS __libc_lock_recursive_t NAME; - -/* Define an initialized lock variable NAME with storage class CLASS. - - For the C library we take a deeper look at the initializer. For - this implementation all fields are initialized to zero. Therefore - we don't initialize the variable which allows putting it into the - BSS section. (Except on PA-RISC and other odd architectures, where - initialized locks must be set to one due to the lack of normal - atomic operations.) */ - -#if __LT_SPINLOCK_INIT == 0 -# define __libc_lock_define_initialized(CLASS,NAME) \ - CLASS __libc_lock_t NAME; -#else -# define __libc_lock_define_initialized(CLASS,NAME) \ - CLASS __libc_lock_t NAME = PTHREAD_MUTEX_INITIALIZER; -#endif - -#define __libc_rwlock_define_initialized(CLASS,NAME) \ - CLASS __libc_rwlock_t NAME = PTHREAD_RWLOCK_INITIALIZER; - -/* Define an initialized recursive lock variable NAME with storage - class CLASS. */ -#define __libc_lock_define_initialized_recursive(CLASS,NAME) \ - CLASS __libc_lock_recursive_t NAME = _LIBC_LOCK_RECURSIVE_INITIALIZER; -#define _LIBC_LOCK_RECURSIVE_INITIALIZER \ - {PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP} - -/* Initialize the named lock variable, leaving it in a consistent, unlocked - state. */ -#define __libc_lock_init(NAME) \ - (__pthread_mutex_init != NULL ? __pthread_mutex_init (&(NAME), NULL) : 0); -#define __libc_rwlock_init(NAME) \ - (__pthread_rwlock_init != NULL ? __pthread_rwlock_init (&(NAME), NULL) : 0); - -/* Same as last but this time we initialize a recursive mutex. */ -#define __libc_lock_init_recursive(NAME) \ - do { \ - if (__pthread_mutex_init != NULL) \ - { \ - pthread_mutexattr_t __attr; \ - __pthread_mutexattr_init (&__attr); \ - __pthread_mutexattr_settype (&__attr, PTHREAD_MUTEX_RECURSIVE_NP); \ - __pthread_mutex_init (&(NAME).mutex, &__attr); \ - __pthread_mutexattr_destroy (&__attr); \ - } \ - } while (0); - -/* Finalize the named lock variable, which must be locked. It cannot be - used again until __libc_lock_init is called again on it. This must be - called on a lock variable before the containing storage is reused. */ -#define __libc_lock_fini(NAME) \ - (__pthread_mutex_destroy != NULL ? __pthread_mutex_destroy (&(NAME)) : 0); -#define __libc_rwlock_fini(NAME) \ - (__pthread_rwlock_destroy != NULL ? __pthread_rwlock_destroy (&(NAME)) : 0); - -/* Finalize recursive named lock. */ -#define __libc_lock_fini_recursive(NAME) __libc_lock_fini ((NAME).mutex) - -/* Lock the named lock variable. */ -#define __libc_lock_lock(NAME) \ - (__pthread_mutex_lock != NULL ? __pthread_mutex_lock (&(NAME)) : 0); -#define __libc_rwlock_rdlock(NAME) \ - (__pthread_rwlock_rdlock != NULL ? __pthread_rwlock_rdlock (&(NAME)) : 0); -#define __libc_rwlock_wrlock(NAME) \ - (__pthread_rwlock_wrlock != NULL ? __pthread_rwlock_wrlock (&(NAME)) : 0); - -/* Lock the recursive named lock variable. */ -#define __libc_lock_lock_recursive(NAME) __libc_lock_lock ((NAME).mutex) - -/* Try to lock the named lock variable. */ -#define __libc_lock_trylock(NAME) \ - (__pthread_mutex_trylock != NULL ? __pthread_mutex_trylock (&(NAME)) : 0) -#define __libc_rwlock_tryrdlock(NAME) \ - (__pthread_rwlock_tryrdlock != NULL \ - ? __pthread_rwlock_tryrdlock (&(NAME)) : 0) -#define __libc_rwlock_trywrlock(NAME) \ - (__pthread_rwlock_trywrlock != NULL \ - ? __pthread_rwlock_trywrlock (&(NAME)) : 0) - -/* Try to lock the recursive named lock variable. */ -#define __libc_lock_trylock_recursive(NAME) __libc_lock_trylock ((NAME).mutex) - -/* Unlock the named lock variable. */ -#define __libc_lock_unlock(NAME) \ - (__pthread_mutex_unlock != NULL ? __pthread_mutex_unlock (&(NAME)) : 0); -#define __libc_rwlock_unlock(NAME) \ - (__pthread_rwlock_unlock != NULL ? __pthread_rwlock_unlock (&(NAME)) : 0); - -/* Unlock the recursive named lock variable. */ -#define __libc_lock_unlock_recursive(NAME) __libc_lock_unlock ((NAME).mutex) - - -/* Define once control variable. */ -#if PTHREAD_ONCE_INIT == 0 -/* Special case for static variables where we can avoid the initialization - if it is zero. */ -# define __libc_once_define(CLASS, NAME) \ - CLASS pthread_once_t NAME -#else -# define __libc_once_define(CLASS, NAME) \ - CLASS pthread_once_t NAME = PTHREAD_ONCE_INIT -#endif - -/* Call handler iff the first call. */ -#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \ - do { \ - if (__pthread_once != NULL) \ - __pthread_once (&(ONCE_CONTROL), (INIT_FUNCTION)); \ - else if ((ONCE_CONTROL) == PTHREAD_ONCE_INIT) { \ - INIT_FUNCTION (); \ - (ONCE_CONTROL) = !PTHREAD_ONCE_INIT; \ - } \ - } while (0) - - -/* Start critical region with cleanup. */ -#define __libc_cleanup_region_start(DOIT, FCT, ARG) \ - { struct _pthread_cleanup_buffer _buffer; \ - int _avail = (DOIT) && _pthread_cleanup_push_defer != NULL; \ - if (_avail) { \ - _pthread_cleanup_push_defer (&_buffer, (FCT), (ARG)); \ - } - -/* End critical region with cleanup. */ -#define __libc_cleanup_region_end(DOIT) \ - if (_avail) { \ - _pthread_cleanup_pop_restore (&_buffer, (DOIT)); \ - } \ - } - -/* Sometimes we have to exit the block in the middle. */ -#define __libc_cleanup_end(DOIT) \ - if (_avail) { \ - _pthread_cleanup_pop_restore (&_buffer, (DOIT)); \ - } - -/* Create thread-specific key. */ -#define __libc_key_create(KEY, DESTRUCTOR) \ - (__pthread_key_create != NULL ? __pthread_key_create (KEY, DESTRUCTOR) : 1) - -/* Get thread-specific data. */ -#define __libc_getspecific(KEY) \ - (__pthread_getspecific != NULL ? __pthread_getspecific (KEY) : NULL) - -/* Set thread-specific data. */ -#define __libc_setspecific(KEY, VALUE) \ - (__pthread_setspecific != NULL ? __pthread_setspecific (KEY, VALUE) : 0) - - -/* Register handlers to execute before and after `fork'. */ -#define __libc_atfork(PREPARE, PARENT, CHILD) \ - (__pthread_atfork != NULL ? __pthread_atfork (PREPARE, PARENT, CHILD) : 0) - -/* Functions that are used by this file and are internal to the GNU C - library. */ - -extern int __pthread_mutex_init (pthread_mutex_t *__mutex, - __const pthread_mutexattr_t *__mutex_attr); - -extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex); - -extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex); - -extern int __pthread_mutex_lock (pthread_mutex_t *__mutex); - -extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex); - -extern int __pthread_mutexattr_init (pthread_mutexattr_t *__attr); - -extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *__attr); - -extern int __pthread_mutexattr_settype (pthread_mutexattr_t *__attr, - int __kind); - -#ifdef __USE_UNIX98 -extern int __pthread_rwlock_init (pthread_rwlock_t *__rwlock, - __const pthread_rwlockattr_t *__attr); - -extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock); - -extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock); - -extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock); - -extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock); - -extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock); - -extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock); -#endif - -extern int __pthread_key_create (pthread_key_t *__key, - void (*__destr_function) (void *)); - -extern int __pthread_setspecific (pthread_key_t __key, - __const void *__pointer); - -extern void *__pthread_getspecific (pthread_key_t __key); - -extern int __pthread_once (pthread_once_t *__once_control, - void (*__init_routine) (void)); - -extern int __pthread_atfork (void (*__prepare) (void), - void (*__parent) (void), - void (*__child) (void)); - - - -/* Make the pthread functions weak so that we can elide them from - single-threaded processes. */ -#ifndef __NO_WEAK_PTHREAD_ALIASES -# ifdef weak_extern -# if _LIBC -# include <bp-sym.h> -# else -# define BP_SYM (sym) sym -# endif -weak_extern (BP_SYM (__pthread_mutex_init)) -weak_extern (BP_SYM (__pthread_mutex_destroy)) -weak_extern (BP_SYM (__pthread_mutex_lock)) -weak_extern (BP_SYM (__pthread_mutex_trylock)) -weak_extern (BP_SYM (__pthread_mutex_unlock)) -weak_extern (BP_SYM (__pthread_mutexattr_init)) -weak_extern (BP_SYM (__pthread_mutexattr_destroy)) -weak_extern (BP_SYM (__pthread_mutexattr_settype)) -weak_extern (BP_SYM (__pthread_rwlock_init)) -weak_extern (BP_SYM (__pthread_rwlock_destroy)) -weak_extern (BP_SYM (__pthread_rwlock_rdlock)) -weak_extern (BP_SYM (__pthread_rwlock_tryrdlock)) -weak_extern (BP_SYM (__pthread_rwlock_wrlock)) -weak_extern (BP_SYM (__pthread_rwlock_trywrlock)) -weak_extern (BP_SYM (__pthread_rwlock_unlock)) -weak_extern (BP_SYM (__pthread_key_create)) -weak_extern (BP_SYM (__pthread_setspecific)) -weak_extern (BP_SYM (__pthread_getspecific)) -weak_extern (BP_SYM (__pthread_once)) -weak_extern (__pthread_initialize) -weak_extern (__pthread_atfork) -weak_extern (BP_SYM (_pthread_cleanup_push_defer)) -weak_extern (BP_SYM (_pthread_cleanup_pop_restore)) -# else -# pragma weak __pthread_mutex_init -# pragma weak __pthread_mutex_destroy -# pragma weak __pthread_mutex_lock -# pragma weak __pthread_mutex_trylock -# pragma weak __pthread_mutex_unlock -# pragma weak __pthread_mutexattr_init -# pragma weak __pthread_mutexattr_destroy -# pragma weak __pthread_mutexattr_settype -# pragma weak __pthread_rwlock_destroy -# pragma weak __pthread_rwlock_rdlock -# pragma weak __pthread_rwlock_tryrdlock -# pragma weak __pthread_rwlock_wrlock -# pragma weak __pthread_rwlock_trywrlock -# pragma weak __pthread_rwlock_unlock -# pragma weak __pthread_key_create -# pragma weak __pthread_setspecific -# pragma weak __pthread_getspecific -# pragma weak __pthread_once -# pragma weak __pthread_initialize -# pragma weak __pthread_atfork -# pragma weak _pthread_cleanup_push_defer -# pragma weak _pthread_cleanup_pop_restore -# endif -#endif - -/* We need portable names for some functions. E.g., when they are - used as argument to __libc_cleanup_region_start. */ -#define __libc_mutex_unlock __pthread_mutex_unlock - -#endif /* bits/libc-lock.h */ diff --git a/libpthread/linuxthreads/sysdeps/pthread/bits/libc-tsd.h b/libpthread/linuxthreads/sysdeps/pthread/bits/libc-tsd.h deleted file mode 100644 index efd0c83be..000000000 --- a/libpthread/linuxthreads/sysdeps/pthread/bits/libc-tsd.h +++ /dev/null @@ -1,66 +0,0 @@ -/* libc-internal interface for thread-specific data. LinuxThreads version. - Copyright (C) 1997-2002, 2003 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef _BITS_LIBC_TSD_H -#define _BITS_LIBC_TSD_H 1 - -/* Fast thread-specific data internal to libc. */ -enum __libc_tsd_key_t { _LIBC_TSD_KEY_MALLOC = 0, - _LIBC_TSD_KEY_DL_ERROR, - _LIBC_TSD_KEY_RPC_VARS, - _LIBC_TSD_KEY_LOCALE, - _LIBC_TSD_KEY_CTYPE_B, - _LIBC_TSD_KEY_CTYPE_TOLOWER, - _LIBC_TSD_KEY_CTYPE_TOUPPER, - _LIBC_TSD_KEY_N }; - -#include <sys/cdefs.h> -#include <tls.h> - -#if USE_TLS && HAVE___THREAD - -/* When __thread works, the generic definition is what we want. */ -# include <sysdeps/generic/bits/libc-tsd.h> - -#else - -extern void *(*__libc_internal_tsd_get) (enum __libc_tsd_key_t) __THROW; -extern int (*__libc_internal_tsd_set) (enum __libc_tsd_key_t, - __const void *) __THROW; -extern void **(*const __libc_internal_tsd_address) (enum __libc_tsd_key_t) - __THROW __attribute__ ((__const__)); - -#define __libc_tsd_address(KEY) \ - (__libc_internal_tsd_address != NULL \ - ? __libc_internal_tsd_address (_LIBC_TSD_KEY_##KEY) \ - : &__libc_tsd_##KEY##_data) - -#define __libc_tsd_define(CLASS, KEY) CLASS void *__libc_tsd_##KEY##_data; -#define __libc_tsd_get(KEY) \ - (__libc_internal_tsd_get != NULL \ - ? __libc_internal_tsd_get (_LIBC_TSD_KEY_##KEY) \ - : __libc_tsd_##KEY##_data) -#define __libc_tsd_set(KEY, VALUE) \ - (__libc_internal_tsd_set != NULL \ - ? __libc_internal_tsd_set (_LIBC_TSD_KEY_##KEY, (VALUE)) \ - : ((__libc_tsd_##KEY##_data = (VALUE)), 0)) - -#endif - -#endif /* bits/libc-tsd.h */ diff --git a/libpthread/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h b/libpthread/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h deleted file mode 100644 index faec63b06..000000000 --- a/libpthread/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h +++ /dev/null @@ -1,142 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -#if !defined _BITS_TYPES_H && !defined _PTHREAD_H -# error "Never include <bits/pthreadtypes.h> directly; use <sys/types.h> instead." -#endif - -#ifndef _BITS_PTHREADTYPES_H -#define _BITS_PTHREADTYPES_H 1 - -#define __need_schedparam -#include <bits/sched.h> - -/* Fast locks (not abstract because mutexes and conditions aren't abstract). */ -struct _pthread_fastlock -{ - long int __status; /* "Free" or "taken" or head of waiting list */ - int __spinlock; /* Used by compare_and_swap emulation. Also, - adaptive SMP lock stores spin count here. */ -}; - -#ifndef _PTHREAD_DESCR_DEFINED -/* Thread descriptors */ -typedef struct _pthread_descr_struct *_pthread_descr; -# define _PTHREAD_DESCR_DEFINED -#endif - - -/* Attributes for threads. */ -typedef struct __pthread_attr_s -{ - int __detachstate; - int __schedpolicy; - struct __sched_param __schedparam; - int __inheritsched; - int __scope; - size_t __guardsize; - int __stackaddr_set; - void *__stackaddr; - size_t __stacksize; -} pthread_attr_t; - - -/* Conditions (not abstract because of PTHREAD_COND_INITIALIZER */ -typedef struct -{ - struct _pthread_fastlock __c_lock; /* Protect against concurrent access */ - _pthread_descr __c_waiting; /* Threads waiting on this condition */ -} pthread_cond_t; - - -/* Attribute for conditionally variables. */ -typedef struct -{ - int __dummy; -} pthread_condattr_t; - -/* Keys for thread-specific data */ -typedef unsigned int pthread_key_t; - - -/* Mutexes (not abstract because of PTHREAD_MUTEX_INITIALIZER). */ -/* (The layout is unnatural to maintain binary compatibility - with earlier releases of LinuxThreads.) */ -typedef struct -{ - int __m_reserved; /* Reserved for future use */ - int __m_count; /* Depth of recursive locking */ - _pthread_descr __m_owner; /* Owner thread (if recursive or errcheck) */ - int __m_kind; /* Mutex kind: fast, recursive or errcheck */ - struct _pthread_fastlock __m_lock; /* Underlying fast lock */ -} pthread_mutex_t; - - -/* Attribute for mutex. */ -typedef struct -{ - int __mutexkind; -} pthread_mutexattr_t; - - -/* Once-only execution */ -typedef int pthread_once_t; - - -#if defined __USE_UNIX98 || defined __USE_XOPEN2K -/* Read-write locks. */ -typedef struct _pthread_rwlock_t -{ - struct _pthread_fastlock __rw_lock; /* Lock to guarantee mutual exclusion */ - int __rw_readers; /* Number of readers */ - _pthread_descr __rw_writer; /* Identity of writer, or NULL if none */ - _pthread_descr __rw_read_waiting; /* Threads waiting for reading */ - _pthread_descr __rw_write_waiting; /* Threads waiting for writing */ - int __rw_kind; /* Reader/Writer preference selection */ - int __rw_pshared; /* Shared between processes or not */ -} pthread_rwlock_t; - - -/* Attribute for read-write locks. */ -typedef struct -{ - int __lockkind; - int __pshared; -} pthread_rwlockattr_t; -#endif - -#ifdef __USE_XOPEN2K -/* POSIX spinlock data type. */ -typedef volatile int pthread_spinlock_t; - -/* POSIX barrier. */ -typedef struct { - struct _pthread_fastlock __ba_lock; /* Lock to guarantee mutual exclusion */ - int __ba_required; /* Threads needed for completion */ - int __ba_present; /* Threads waiting */ - _pthread_descr __ba_waiting; /* Queue of waiting threads */ -} pthread_barrier_t; - -/* barrier attribute */ -typedef struct { - int __pshared; -} pthread_barrierattr_t; - -#endif - - -/* Thread identifiers */ -typedef unsigned long int pthread_t; - -#endif /* bits/pthreadtypes.h */ diff --git a/libpthread/linuxthreads/sysdeps/pthread/pthread.h b/libpthread/linuxthreads/sysdeps/pthread/pthread.h deleted file mode 100644 index 6613cab88..000000000 --- a/libpthread/linuxthreads/sysdeps/pthread/pthread.h +++ /dev/null @@ -1,705 +0,0 @@ -/* Linuxthreads - a simple clone()-based implementation of Posix */ -/* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ -/* */ -/* This program is free software; you can redistribute it and/or */ -/* modify it under the terms of the GNU Library General Public License */ -/* as published by the Free Software Foundation; either version 2 */ -/* of the License, or (at your option) any later version. */ -/* */ -/* This program is distributed in the hope that it will be useful, */ -/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ -/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ -/* GNU Library General Public License for more details. */ - -#ifndef _PTHREAD_H -#define _PTHREAD_H 1 - -#include <features.h> - -#include <sched.h> -#include <time.h> - -#define __need_sigset_t -#include <signal.h> -#include <bits/pthreadtypes.h> -#include <bits/initspin.h> -#ifdef _LIBC -#include <bits/uClibc_pthread.h> -#endif - - -__BEGIN_DECLS - -/* Initializers. */ - -#define PTHREAD_MUTEX_INITIALIZER \ - {0, 0, 0, PTHREAD_MUTEX_ADAPTIVE_NP, __LOCK_INITIALIZER} -#ifdef __USE_GNU -# define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP \ - {0, 0, 0, PTHREAD_MUTEX_RECURSIVE_NP, __LOCK_INITIALIZER} -# define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP \ - {0, 0, 0, PTHREAD_MUTEX_ERRORCHECK_NP, __LOCK_INITIALIZER} -# define PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP \ - {0, 0, 0, PTHREAD_MUTEX_ADAPTIVE_NP, __LOCK_INITIALIZER} -#endif - -#define PTHREAD_COND_INITIALIZER {__LOCK_INITIALIZER, 0} - -#if defined __USE_UNIX98 || defined __USE_XOPEN2K -# define PTHREAD_RWLOCK_INITIALIZER \ - { __LOCK_INITIALIZER, 0, NULL, NULL, NULL, \ - PTHREAD_RWLOCK_DEFAULT_NP, PTHREAD_PROCESS_PRIVATE } -#endif -#ifdef __USE_GNU -# define PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP \ - { __LOCK_INITIALIZER, 0, NULL, NULL, NULL, \ - PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP, PTHREAD_PROCESS_PRIVATE } -#endif - -/* Values for attributes. */ - -enum -{ - PTHREAD_CREATE_JOINABLE, -#define PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_JOINABLE - PTHREAD_CREATE_DETACHED -#define PTHREAD_CREATE_DETACHED PTHREAD_CREATE_DETACHED -}; - -enum -{ - PTHREAD_INHERIT_SCHED, -#define PTHREAD_INHERIT_SCHED PTHREAD_INHERIT_SCHED - PTHREAD_EXPLICIT_SCHED -#define PTHREAD_EXPLICIT_SCHED PTHREAD_EXPLICIT_SCHED -}; - -enum -{ - PTHREAD_SCOPE_SYSTEM, -#define PTHREAD_SCOPE_SYSTEM PTHREAD_SCOPE_SYSTEM - PTHREAD_SCOPE_PROCESS -#define PTHREAD_SCOPE_PROCESS PTHREAD_SCOPE_PROCESS -}; - -enum -{ - PTHREAD_MUTEX_ADAPTIVE_NP, - PTHREAD_MUTEX_RECURSIVE_NP, - PTHREAD_MUTEX_ERRORCHECK_NP, - PTHREAD_MUTEX_TIMED_NP -#ifdef __USE_UNIX98 - , - PTHREAD_MUTEX_NORMAL = PTHREAD_MUTEX_ADAPTIVE_NP, - PTHREAD_MUTEX_RECURSIVE = PTHREAD_MUTEX_RECURSIVE_NP, - PTHREAD_MUTEX_ERRORCHECK = PTHREAD_MUTEX_ERRORCHECK_NP, - PTHREAD_MUTEX_DEFAULT = PTHREAD_MUTEX_NORMAL -#endif -#ifdef __USE_GNU - /* For compatibility. */ - , PTHREAD_MUTEX_FAST_NP = PTHREAD_MUTEX_ADAPTIVE_NP -#endif -}; - -enum -{ - PTHREAD_PROCESS_PRIVATE, -#define PTHREAD_PROCESS_PRIVATE PTHREAD_PROCESS_PRIVATE - PTHREAD_PROCESS_SHARED -#define PTHREAD_PROCESS_SHARED PTHREAD_PROCESS_SHARED -}; - -#if defined __USE_UNIX98 || defined __USE_XOPEN2K -enum -{ - PTHREAD_RWLOCK_PREFER_READER_NP, - PTHREAD_RWLOCK_PREFER_WRITER_NP, - PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP, - PTHREAD_RWLOCK_DEFAULT_NP = PTHREAD_RWLOCK_PREFER_WRITER_NP -}; -#endif /* Unix98 */ - -#define PTHREAD_ONCE_INIT 0 - -/* Special constants */ - -#ifdef __USE_XOPEN2K -/* -1 is distinct from 0 and all errno constants */ -# define PTHREAD_BARRIER_SERIAL_THREAD -1 -#endif - -/* Cleanup buffers */ - -struct _pthread_cleanup_buffer -{ - void (*__routine) (void *); /* Function to call. */ - void *__arg; /* Its argument. */ - int __canceltype; /* Saved cancellation type. */ - struct _pthread_cleanup_buffer *__prev; /* Chaining of cleanup functions. */ -}; - -/* Cancellation */ - -enum -{ - PTHREAD_CANCEL_ENABLE, -#define PTHREAD_CANCEL_ENABLE PTHREAD_CANCEL_ENABLE - PTHREAD_CANCEL_DISABLE -#define PTHREAD_CANCEL_DISABLE PTHREAD_CANCEL_DISABLE -}; -enum -{ - PTHREAD_CANCEL_DEFERRED, -#define PTHREAD_CANCEL_DEFERRED PTHREAD_CANCEL_DEFERRED - PTHREAD_CANCEL_ASYNCHRONOUS -#define PTHREAD_CANCEL_ASYNCHRONOUS PTHREAD_CANCEL_ASYNCHRONOUS -}; -#define PTHREAD_CANCELED ((void *) -1) - - -/* Function for handling threads. */ - -/* Create a thread with given attributes ATTR (or default attributes - if ATTR is NULL), and call function START_ROUTINE with given - arguments ARG. */ -extern int pthread_create (pthread_t *__restrict __threadp, - __const pthread_attr_t *__restrict __attr, - void *(*__start_routine) (void *), - void *__restrict __arg) __THROW; - -/* Obtain the identifier of the current thread. */ -extern pthread_t pthread_self (void) __THROW; - -/* Compare two thread identifiers. */ -extern int pthread_equal (pthread_t __thread1, pthread_t __thread2) __THROW; - -/* Terminate calling thread. */ -extern void pthread_exit (void *__retval) __attribute__ ((__noreturn__)); - -/* Make calling thread wait for termination of the thread TH. The - exit status of the thread is stored in *THREAD_RETURN, if THREAD_RETURN - is not NULL. */ -extern int pthread_join (pthread_t __th, void **__thread_return); - -/* Indicate that the thread TH is never to be joined with PTHREAD_JOIN. - The resources of TH will therefore be freed immediately when it - terminates, instead of waiting for another thread to perform PTHREAD_JOIN - on it. */ -extern int pthread_detach (pthread_t __th) __THROW; - - -/* Functions for handling attributes. */ - -/* Initialize thread attribute *ATTR with default attributes - (detachstate is PTHREAD_JOINABLE, scheduling policy is SCHED_OTHER, - no user-provided stack). */ -extern int pthread_attr_init (pthread_attr_t *__attr) __THROW; - -/* Destroy thread attribute *ATTR. */ -extern int pthread_attr_destroy (pthread_attr_t *__attr) __THROW; - -/* Set the `detachstate' attribute in *ATTR according to DETACHSTATE. */ -extern int pthread_attr_setdetachstate (pthread_attr_t *__attr, - int __detachstate) __THROW; - -/* Return in *DETACHSTATE the `detachstate' attribute in *ATTR. */ -extern int pthread_attr_getdetachstate (__const pthread_attr_t *__attr, - int *__detachstate) __THROW; - -/* Set scheduling parameters (priority, etc) in *ATTR according to PARAM. */ -extern int pthread_attr_setschedparam (pthread_attr_t *__restrict __attr, - __const struct sched_param *__restrict - __param) __THROW; - -/* Return in *PARAM the scheduling parameters of *ATTR. */ -extern int pthread_attr_getschedparam (__const pthread_attr_t *__restrict - __attr, - struct sched_param *__restrict __param) - __THROW; - -/* Set scheduling policy in *ATTR according to POLICY. */ -extern int pthread_attr_setschedpolicy (pthread_attr_t *__attr, int __policy) - __THROW; - -/* Return in *POLICY the scheduling policy of *ATTR. */ -extern int pthread_attr_getschedpolicy (__const pthread_attr_t *__restrict - __attr, int *__restrict __policy) - __THROW; - -/* Set scheduling inheritance mode in *ATTR according to INHERIT. */ -extern int pthread_attr_setinheritsched (pthread_attr_t *__attr, - int __inherit) __THROW; - -/* Return in *INHERIT the scheduling inheritance mode of *ATTR. */ -extern int pthread_attr_getinheritsched (__const pthread_attr_t *__restrict - __attr, int *__restrict __inherit) - __THROW; - -/* Set scheduling contention scope in *ATTR according to SCOPE. */ -extern int pthread_attr_setscope (pthread_attr_t *__attr, int __scope) - __THROW; - -/* Return in *SCOPE the scheduling contention scope of *ATTR. */ -extern int pthread_attr_getscope (__const pthread_attr_t *__restrict __attr, - int *__restrict __scope) __THROW; - -#ifdef __USE_UNIX98 -/* Set the size of the guard area at the bottom of the thread. */ -extern int pthread_attr_setguardsize (pthread_attr_t *__attr, - size_t __guardsize) __THROW; - -/* Get the size of the guard area at the bottom of the thread. */ -extern int pthread_attr_getguardsize (__const pthread_attr_t *__restrict - __attr, size_t *__restrict __guardsize) - __THROW; -#endif - -/* Set the starting address of the stack of the thread to be created. - Depending on whether the stack grows up or down the value must either - be higher or lower than all the address in the memory block. The - minimal size of the block must be PTHREAD_STACK_SIZE. */ -extern int pthread_attr_setstackaddr (pthread_attr_t *__attr, - void *__stackaddr) __THROW; - -/* Return the previously set address for the stack. */ -extern int pthread_attr_getstackaddr (__const pthread_attr_t *__restrict - __attr, void **__restrict __stackaddr) - __THROW; - -#ifdef __USE_XOPEN2K -/* The following two interfaces are intended to replace the last two. They - require setting the address as well as the size since only setting the - address will make the implementation on some architectures impossible. */ -extern int pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr, - size_t __stacksize) __THROW; - -/* Return the previously set address for the stack. */ -extern int pthread_attr_getstack (__const pthread_attr_t *__restrict __attr, - void **__restrict __stackaddr, - size_t *__restrict __stacksize) __THROW; -#endif - -/* Add information about the minimum stack size needed for the thread - to be started. This size must never be less than PTHREAD_STACK_SIZE - and must also not exceed the system limits. */ -extern int pthread_attr_setstacksize (pthread_attr_t *__attr, - size_t __stacksize) __THROW; - -/* Return the currently used minimal stack size. */ -extern int pthread_attr_getstacksize (__const pthread_attr_t *__restrict - __attr, size_t *__restrict __stacksize) - __THROW; - -#if 0 -/* Not yet implemented in uClibc! */ - -#ifdef __USE_GNU -/* Initialize thread attribute *ATTR with attributes corresponding to the - already running thread TH. It shall be called on unitialized ATTR - and destroyed with pthread_attr_destroy when no longer needed. */ -extern int pthread_getattr_np (pthread_t __th, pthread_attr_t *__attr) __THROW; -#endif -#endif - -/* Functions for scheduling control. */ - -/* Set the scheduling parameters for TARGET_THREAD according to POLICY - and *PARAM. */ -extern int pthread_setschedparam (pthread_t __target_thread, int __policy, - __const struct sched_param *__param) - __THROW; - -/* Return in *POLICY and *PARAM the scheduling parameters for TARGET_THREAD. */ -extern int pthread_getschedparam (pthread_t __target_thread, - int *__restrict __policy, - struct sched_param *__restrict __param) - __THROW; - -#ifdef __USE_UNIX98 -/* Determine level of concurrency. */ -extern int pthread_getconcurrency (void) __THROW; - -/* Set new concurrency level to LEVEL. */ -extern int pthread_setconcurrency (int __level) __THROW; -#endif - -#if 0 -/* Not yet implemented in uClibc! */ - -#ifdef __USE_GNU -/* Yield the processor to another thread or process. - This function is similar to the POSIX `sched_yield' function but - might be differently implemented in the case of a m-on-n thread - implementation. */ -extern int pthread_yield (void) __THROW; -#endif -#endif - -/* Functions for mutex handling. */ - -/* Initialize MUTEX using attributes in *MUTEX_ATTR, or use the - default values if later is NULL. */ -extern int pthread_mutex_init (pthread_mutex_t *__restrict __mutex, - __const pthread_mutexattr_t *__restrict - __mutex_attr) __THROW; - -/* Destroy MUTEX. */ -extern int pthread_mutex_destroy (pthread_mutex_t *__mutex) __THROW; - -/* Try to lock MUTEX. */ -extern int pthread_mutex_trylock (pthread_mutex_t *__mutex) __THROW; - -/* Wait until lock for MUTEX becomes available and lock it. */ -extern int pthread_mutex_lock (pthread_mutex_t *__mutex) __THROW; - -#ifdef __USE_XOPEN2K -/* Wait until lock becomes available, or specified time passes. */ -extern int pthread_mutex_timedlock (pthread_mutex_t *__restrict __mutex, - __const struct timespec *__restrict - __abstime) __THROW; -#endif - -/* Unlock MUTEX. */ -extern int pthread_mutex_unlock (pthread_mutex_t *__mutex) __THROW; - - -/* Functions for handling mutex attributes. */ - -/* Initialize mutex attribute object ATTR with default attributes - (kind is PTHREAD_MUTEX_TIMED_NP). */ -extern int pthread_mutexattr_init (pthread_mutexattr_t *__attr) __THROW; - -/* Destroy mutex attribute object ATTR. */ -extern int pthread_mutexattr_destroy (pthread_mutexattr_t *__attr) __THROW; - -/* Get the process-shared flag of the mutex attribute ATTR. */ -extern int pthread_mutexattr_getpshared (__const pthread_mutexattr_t * - __restrict __attr, - int *__restrict __pshared) __THROW; - -/* Set the process-shared flag of the mutex attribute ATTR. */ -extern int pthread_mutexattr_setpshared (pthread_mutexattr_t *__attr, - int __pshared) __THROW; - -#ifdef __USE_UNIX98 -/* Set the mutex kind attribute in *ATTR to KIND (either PTHREAD_MUTEX_NORMAL, - PTHREAD_MUTEX_RECURSIVE, PTHREAD_MUTEX_ERRORCHECK, or - PTHREAD_MUTEX_DEFAULT). */ -extern int pthread_mutexattr_settype (pthread_mutexattr_t *__attr, int __kind) - __THROW; - -/* Return in *KIND the mutex kind attribute in *ATTR. */ -extern int pthread_mutexattr_gettype (__const pthread_mutexattr_t *__restrict - __attr, int *__restrict __kind) __THROW; -#endif - - -/* Functions for handling conditional variables. */ - -/* Initialize condition variable COND using attributes ATTR, or use - the default values if later is NULL. */ -extern int pthread_cond_init (pthread_cond_t *__restrict __cond, - __const pthread_condattr_t *__restrict - __cond_attr) __THROW; - -/* Destroy condition variable COND. */ -extern int pthread_cond_destroy (pthread_cond_t *__cond) __THROW; - -/* Wake up one thread waiting for condition variable COND. */ -extern int pthread_cond_signal (pthread_cond_t *__cond) __THROW; - -/* Wake up all threads waiting for condition variables COND. */ -extern int pthread_cond_broadcast (pthread_cond_t *__cond) __THROW; - -/* Wait for condition variable COND to be signaled or broadcast. - MUTEX is assumed to be locked before. */ -extern int pthread_cond_wait (pthread_cond_t *__restrict __cond, - pthread_mutex_t *__restrict __mutex); - -/* Wait for condition variable COND to be signaled or broadcast until - ABSTIME. MUTEX is assumed to be locked before. ABSTIME is an - absolute time specification; zero is the beginning of the epoch - (00:00:00 GMT, January 1, 1970). */ -extern int pthread_cond_timedwait (pthread_cond_t *__restrict __cond, - pthread_mutex_t *__restrict __mutex, - __const struct timespec *__restrict - __abstime); - -/* Functions for handling condition variable attributes. */ - -/* Initialize condition variable attribute ATTR. */ -extern int pthread_condattr_init (pthread_condattr_t *__attr) __THROW; - -/* Destroy condition variable attribute ATTR. */ -extern int pthread_condattr_destroy (pthread_condattr_t *__attr) __THROW; - -/* Get the process-shared flag of the condition variable attribute ATTR. */ -extern int pthread_condattr_getpshared (__const pthread_condattr_t * - __restrict __attr, - int *__restrict __pshared) __THROW; - -/* Set the process-shared flag of the condition variable attribute ATTR. */ -extern int pthread_condattr_setpshared (pthread_condattr_t *__attr, - int __pshared) __THROW; - - -#if defined __USE_UNIX98 || defined __USE_XOPEN2K -/* Functions for handling read-write locks. */ - -/* Initialize read-write lock RWLOCK using attributes ATTR, or use - the default values if later is NULL. */ -extern int pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock, - __const pthread_rwlockattr_t *__restrict - __attr) __THROW; - -/* Destroy read-write lock RWLOCK. */ -extern int pthread_rwlock_destroy (pthread_rwlock_t *__rwlock) __THROW; - -/* Acquire read lock for RWLOCK. */ -extern int pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock) __THROW; - -/* Try to acquire read lock for RWLOCK. */ -extern int pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock) __THROW; - -# ifdef __USE_XOPEN2K -/* Try to acquire read lock for RWLOCK or return after specfied time. */ -extern int pthread_rwlock_timedrdlock (pthread_rwlock_t *__restrict __rwlock, - __const struct timespec *__restrict - __abstime) __THROW; -# endif - -/* Acquire write lock for RWLOCK. */ -extern int pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock) __THROW; - -/* Try to acquire write lock for RWLOCK. */ -extern int pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock) __THROW; - -# ifdef __USE_XOPEN2K -/* Try to acquire write lock for RWLOCK or return after specfied time. */ -extern int pthread_rwlock_timedwrlock (pthread_rwlock_t *__restrict __rwlock, - __const struct timespec *__restrict - __abstime) __THROW; -# endif - -/* Unlock RWLOCK. */ -extern int pthread_rwlock_unlock (pthread_rwlock_t *__rwlock) __THROW; - - -/* Functions for handling read-write lock attributes. */ - -/* Initialize attribute object ATTR with default values. */ -extern int pthread_rwlockattr_init (pthread_rwlockattr_t *__attr) __THROW; - -/* Destroy attribute object ATTR. */ -extern int pthread_rwlockattr_destroy (pthread_rwlockattr_t *__attr) __THROW; - -/* Return current setting of process-shared attribute of ATTR in PSHARED. */ -extern int pthread_rwlockattr_getpshared (__const pthread_rwlockattr_t * - __restrict __attr, - int *__restrict __pshared) __THROW; - -/* Set process-shared attribute of ATTR to PSHARED. */ -extern int pthread_rwlockattr_setpshared (pthread_rwlockattr_t *__attr, - int __pshared) __THROW; - -/* Return current setting of reader/writer preference. */ -extern int pthread_rwlockattr_getkind_np (__const pthread_rwlockattr_t *__attr, - int *__pref) __THROW; - -/* Set reader/write preference. */ -extern int pthread_rwlockattr_setkind_np (pthread_rwlockattr_t *__attr, - int __pref) __THROW; -#endif - -#if 0 -/* Not yet implemented in uClibc! */ - -#ifdef __USE_XOPEN2K -/* The IEEE Std. 1003.1j-2000 introduces functions to implement - spinlocks. */ - -/* Initialize the spinlock LOCK. If PSHARED is nonzero the spinlock can - be shared between different processes. */ -extern int pthread_spin_init (pthread_spinlock_t *__lock, int __pshared) - __THROW; - -/* Destroy the spinlock LOCK. */ -extern int pthread_spin_destroy (pthread_spinlock_t *__lock) __THROW; - -/* Wait until spinlock LOCK is retrieved. */ -extern int pthread_spin_lock (pthread_spinlock_t *__lock) __THROW; - -/* Try to lock spinlock LOCK. */ -extern int pthread_spin_trylock (pthread_spinlock_t *__lock) __THROW; - -/* Release spinlock LOCK. */ -extern int pthread_spin_unlock (pthread_spinlock_t *__lock) __THROW; - - -/* Barriers are a also a new feature in 1003.1j-2000. */ - -extern int pthread_barrier_init (pthread_barrier_t *__restrict __barrier, - __const pthread_barrierattr_t *__restrict - __attr, unsigned int __count) __THROW; - -extern int pthread_barrier_destroy (pthread_barrier_t *__barrier) __THROW; - -extern int pthread_barrierattr_init (pthread_barrierattr_t *__attr) __THROW; - -extern int pthread_barrierattr_destroy (pthread_barrierattr_t *__attr) __THROW; - -extern int pthread_barrierattr_getpshared (__const pthread_barrierattr_t * - __restrict __attr, - int *__restrict __pshared) __THROW; - -extern int pthread_barrierattr_setpshared (pthread_barrierattr_t *__attr, - int __pshared) __THROW; - -extern int pthread_barrier_wait (pthread_barrier_t *__barrier) __THROW; -#endif -#endif - - -/* Functions for handling thread-specific data. */ - -/* Create a key value identifying a location in the thread-specific - data area. Each thread maintains a distinct thread-specific data - area. DESTR_FUNCTION, if non-NULL, is called with the value - associated to that key when the key is destroyed. - DESTR_FUNCTION is not called if the value associated is NULL when - the key is destroyed. */ -extern int pthread_key_create (pthread_key_t *__key, - void (*__destr_function) (void *)) __THROW; - -/* Destroy KEY. */ -extern int pthread_key_delete (pthread_key_t __key) __THROW; - -/* Store POINTER in the thread-specific data slot identified by KEY. */ -extern int pthread_setspecific (pthread_key_t __key, - __const void *__pointer) __THROW; - -/* Return current value of the thread-specific data slot identified by KEY. */ -extern void *pthread_getspecific (pthread_key_t __key) __THROW; - - -/* Functions for handling initialization. */ - -/* Guarantee that the initialization function INIT_ROUTINE will be called - only once, even if pthread_once is executed several times with the - same ONCE_CONTROL argument. ONCE_CONTROL must point to a static or - extern variable initialized to PTHREAD_ONCE_INIT. - - The initialization functions might throw exception which is why - this function is not marked with __THROW. */ -extern int pthread_once (pthread_once_t *__once_control, - void (*__init_routine) (void)); - - -/* Functions for handling cancellation. */ - -/* Set cancelability state of current thread to STATE, returning old - state in *OLDSTATE if OLDSTATE is not NULL. */ -extern int pthread_setcancelstate (int __state, int *__oldstate); - -/* Set cancellation state of current thread to TYPE, returning the old - type in *OLDTYPE if OLDTYPE is not NULL. */ -extern int pthread_setcanceltype (int __type, int *__oldtype); - -/* Cancel THREAD immediately or at the next possibility. */ -extern int pthread_cancel (pthread_t __cancelthread); - -/* Test for pending cancellation for the current thread and terminate - the thread as per pthread_exit(PTHREAD_CANCELED) if it has been - cancelled. */ -extern void pthread_testcancel (void); - - -/* Install a cleanup handler: ROUTINE will be called with arguments ARG - when the thread is cancelled or calls pthread_exit. ROUTINE will also - be called with arguments ARG when the matching pthread_cleanup_pop - is executed with non-zero EXECUTE argument. - pthread_cleanup_push and pthread_cleanup_pop are macros and must always - be used in matching pairs at the same nesting level of braces. */ - -#define pthread_cleanup_push(routine,arg) \ - { struct _pthread_cleanup_buffer _buffer; \ - _pthread_cleanup_push (&_buffer, (routine), (arg)); - -extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *__buffer, - void (*__routine) (void *), - void *__arg) __THROW; - -/* Remove a cleanup handler installed by the matching pthread_cleanup_push. - If EXECUTE is non-zero, the handler function is called. */ - -#define pthread_cleanup_pop(execute) \ - _pthread_cleanup_pop (&_buffer, (execute)); } - -extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *__buffer, - int __execute) __THROW; - -/* Install a cleanup handler as pthread_cleanup_push does, but also - saves the current cancellation type and set it to deferred cancellation. */ - -#ifdef __USE_GNU -# define pthread_cleanup_push_defer_np(routine,arg) \ - { struct _pthread_cleanup_buffer _buffer; \ - _pthread_cleanup_push_defer (&_buffer, (routine), (arg)); - -extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *__buffer, - void (*__routine) (void *), - void *__arg) __THROW; - -/* Remove a cleanup handler as pthread_cleanup_pop does, but also - restores the cancellation type that was in effect when the matching - pthread_cleanup_push_defer was called. */ - -# define pthread_cleanup_pop_restore_np(execute) \ - _pthread_cleanup_pop_restore (&_buffer, (execute)); } - -extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *__buffer, - int __execute) __THROW; -#endif - - -#if 0 -/* Not yet implemented in uClibc! */ - -#ifdef __USE_XOPEN2K -/* Get ID of CPU-time clock for thread THREAD_ID. */ -extern int pthread_getcpuclockid (pthread_t __thread_id, - clockid_t *__clock_id) __THROW; -#endif -#endif - - -/* Functions for handling signals. */ -#include <bits/sigthread.h> - - -/* Functions for handling process creation and process execution. */ - -/* Install handlers to be called when a new process is created with FORK. - The PREPARE handler is called in the parent process just before performing - FORK. The PARENT handler is called in the parent process just after FORK. - The CHILD handler is called in the child process. Each of the three - handlers can be NULL, meaning that no handler needs to be called at that - point. - PTHREAD_ATFORK can be called several times, in which case the PREPARE - handlers are called in LIFO order (last added with PTHREAD_ATFORK, - first called before FORK), and the PARENT and CHILD handlers are called - in FIFO (first added, first called). */ - -extern int pthread_atfork (void (*__prepare) (void), - void (*__parent) (void), - void (*__child) (void)) __THROW; - -/* Terminate all threads in the program except the calling process. - Should be called just before invoking one of the exec*() functions. */ - -extern void pthread_kill_other_threads_np (void) __THROW; - -__END_DECLS - -#endif /* pthread.h */ diff --git a/libpthread/linuxthreads/sysdeps/pthread/tls.h b/libpthread/linuxthreads/sysdeps/pthread/tls.h deleted file mode 100644 index 6a23ec05e..000000000 --- a/libpthread/linuxthreads/sysdeps/pthread/tls.h +++ /dev/null @@ -1,81 +0,0 @@ -/* Definition for thread-local data handling. Generic version. - Copyright (C) 2002 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -/* By default no TLS support is available. This is signaled by the - absence of the symbol USE_TLS. */ -#undef USE_TLS - - -/* An architecture-specific version of this file has to defined a - number of symbols: - - TLS_TCB_AT_TP or TLS_DTV_AT_TP - - The presence of one of these symbols signals which variant of - the TLS ABI is used. There are in the moment two variants - available: - - * the thread pointer points to a thread control block - - * the thread pointer points to the dynamic thread vector - - - TLS_TCB_SIZE - - This is the size of the thread control block structure. How - this is actually defined depends on the ABI. The thread control - block could be internal descriptor of the thread library or - just a data structure which allows finding the DTV. - - TLS_INIT_TCB_SIZE - - Similarly, but this value is only used at startup and in the - dynamic linker itself. There are no threads in use at that time. - - - TLS_TCB_ALIGN - - Alignment requirements for the TCB structure. - - TLS_INIT_TCB_ALIGN - - Similarly, but for the structure used at startup time. - - - INSTALL_DTV(tcb, init_dtv) - - This macro must install the given initial DTV into the thread control - block TCB. The normal runtime functionality must then be able to - use the value. - - - TLS_INIT_TP(tcb, firstcall) - - This macro must initialize the thread pointer to enable normal TLS - operation. The first parameter is a pointer to the thread control - block. The second parameter specifies whether this is the first - call for the TCB. ld.so calls this macro more than once. - - - THREAD_DTV() - - This macro returns the address of the DTV of the current thread. - This normally is done using the the thread register which points - to the dtv or the TCB (from which the DTV can found). - */ diff --git a/libpthread/linuxthreads/sysdeps/sh/pt-machine.h b/libpthread/linuxthreads/sysdeps/sh/pt-machine.h deleted file mode 100644 index 02545e6b4..000000000 --- a/libpthread/linuxthreads/sysdeps/sh/pt-machine.h +++ /dev/null @@ -1,81 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - SuperH version. - Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Niibe Yutaka <gniibe@m17n.org>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef __ASSEMBLER__ -#ifndef PT_EI -# define PT_EI extern inline __attribute__ ((always_inline)) -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - int ret; - - __asm__ __volatile__( - "tas.b @%1\n\t" - "movt %0" - : "=r" (ret) - : "r" (spinlock) - : "memory", "cc"); - - return (ret == 0); -} - -/* We want the OS to assign stack addresses. */ -#define FLOATING_STACKS 1 - -/* Maximum size of the stack if the rlimit is unlimited. */ -#define ARCH_STACK_MAX_SIZE 32*1024*1024 - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME stack_pointer -register char * stack_pointer __asm__ ("r15"); - -/* Return the thread descriptor for the current thread. */ -struct _pthread_descr_struct; -#define THREAD_SELF \ - ({ struct _pthread_descr_struct *self; \ - __asm__("stc gbr,%0" : "=r" (self)); self;}) - -/* Initialize the thread-unique value. */ -#define INIT_THREAD_SELF(descr, nr) \ - ({ __asm__ __volatile__("ldc %0,gbr" : : "r" (descr));}) - -/* Access to data in the thread descriptor is easy. */ -#define THREAD_GETMEM(descr, member) \ - ((void) sizeof (descr), THREAD_SELF->member) -#define THREAD_GETMEM_NC(descr, member) \ - ((void) sizeof (descr), THREAD_SELF->member) -#define THREAD_SETMEM(descr, member, value) \ - ((void) sizeof (descr), THREAD_SELF->member = (value)) -#define THREAD_SETMEM_NC(descr, member, value) \ - ((void) sizeof (descr), THREAD_SELF->member = (value)) -#endif /* __ASSEMBLER__ */ - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/sh/tls.h b/libpthread/linuxthreads/sysdeps/sh/tls.h deleted file mode 100644 index 75326d8e1..000000000 --- a/libpthread/linuxthreads/sysdeps/sh/tls.h +++ /dev/null @@ -1,117 +0,0 @@ -/* Definition for thread-local data handling. linuxthreads/SH version. - Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#ifndef _TLS_H -#define _TLS_H - -# include <pt-machine.h> - -#ifndef __ASSEMBLER__ -# include <stdbool.h> -# include <stddef.h> -# include <stdint.h> - -/* Type for the dtv. */ -typedef union dtv -{ - size_t counter; - void *pointer; -} dtv_t; - - -typedef struct -{ - void *tcb; /* Pointer to the TCB. Not necessary the - thread descriptor used by libpthread. */ - dtv_t *dtv; - void *self; /* Pointer to the thread descriptor. */ -} tcbhead_t; - - -/* We can support TLS only if the floating-stack support is available. */ -#if defined FLOATING_STACKS && defined HAVE_TLS_SUPPORT - -/* Get system call information. */ -# include <sysdep.h> - -/* Signal that TLS support is available. */ -//# define USE_TLS 1 - - -/* Get the thread descriptor definition. */ -# include <linuxthreads/descr.h> - -/* This is the size of the initial TCB. */ -# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) - -/* Alignment requirements for the initial TCB. */ -# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) - -/* This is the size of the TCB. */ -# define TLS_TCB_SIZE sizeof (struct _pthread_descr_struct) - -/* Alignment requirements for the TCB. */ -# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct) - -/* The TLS blocks start right after the TCB. */ -# define TLS_DTV_AT_TP 1 - - -/* Install the dtv pointer. The pointer passed is to the element with - index -1 which contain the length. */ -# define INSTALL_DTV(descr, dtvp) \ - ((tcbhead_t *) (descr))->dtv = dtvp + 1 - -/* Install new dtv for current thread. */ -# define INSTALL_NEW_DTV(dtv) \ - ({ struct _pthread_descr_struct *__descr; \ - THREAD_SETMEM (__descr, p_header.data.dtvp, (dtv)); }) - -/* Return dtv of given thread descriptor. */ -# define GET_DTV(descr) \ - (((tcbhead_t *) (descr))->dtv) - -/* Code to initially initialize the thread pointer. This might need - special attention since 'errno' is not yet available and if the - operation can cause a failure 'errno' must not be touched. */ -# define TLS_INIT_TP(descr, secondcall) \ - ({ \ - void *_descr = (descr); \ - int result; \ - tcbhead_t *head = _descr; \ - \ - head->tcb = _descr; \ - /* For now the thread descriptor is at the same address. */ \ - head->self = _descr; \ - \ - asm ("ldc %0,gbr" : : "r" (_descr)); \ - \ - 0; \ - }) - - -/* Return the address of the dtv for the current thread. */ -# define THREAD_DTV() \ - ({ struct _pthread_descr_struct *__descr; \ - THREAD_GETMEM (__descr, p_header.data.dtvp); }) - -#endif /* FLOATING_STACKS && HAVE_TLS_SUPPORT */ -#endif /* __ASSEMBLER__ */ - -#endif /* tls.h */ diff --git a/libpthread/linuxthreads/sysdeps/sh64/Makefile.arch b/libpthread/linuxthreads/sysdeps/sh64/Makefile.arch deleted file mode 100644 index 38cd12db6..000000000 --- a/libpthread/linuxthreads/sysdeps/sh64/Makefile.arch +++ /dev/null @@ -1,26 +0,0 @@ -# Makefile for uClibc -# -# Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org> -# Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org> -# -# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. -# - -# We need to build as SHcompact for tas.. -ARCH_CFLAGS:=$(subst 32media,compact,$(ARCH_CFLAGS)) - -libpthread_ARCH_DIR:=$(top_srcdir)libpthread/linuxthreads/sysdeps/sh64 -libpthread_ARCH_OUT:=$(top_builddir)libpthread/linuxthreads/sysdeps/sh64 - -libpthread_ARCH_SRC:=$(wildcard $(libpthread_ARCH_DIR)/*.c) -libpthread_ARCH_OBJ:=$(patsubst $(libpthread_ARCH_DIR)/%.c,$(libpthread_ARCH_OUT)/%.o,$(libpthread_ARCH_SRC)) - -libpthread-a-$(UCLIBC_HAS_THREADS)+=$(libpthread_ARCH_OBJ) -libpthread-so-$(UCLIBC_HAS_THREADS)+=$(libpthread_ARCH_OBJ:.o=.os) - -libpthread-multi-$(UCLIBC_HAS_THREADS)+=$(libpthread_ARCH_SRC) - -objclean-y+=libpthread_arch_objclean - -libpthread_arch_objclean: - $(RM) $(libpthread_ARCH_OUT)/*.{o,os} diff --git a/libpthread/linuxthreads/sysdeps/sh64/pt-machine.c b/libpthread/linuxthreads/sysdeps/sh64/pt-machine.c deleted file mode 100644 index ea4881322..000000000 --- a/libpthread/linuxthreads/sysdeps/sh64/pt-machine.c +++ /dev/null @@ -1,47 +0,0 @@ -/* Cloned for uClibc by Paul Mundt, December 2003 */ -/* Modified by SuperH, Inc. September 2003 */ - -/* Machine-dependent pthreads configuration and inline functions. - SH5 version. - Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Niibe Yutaka <gniibe@m17n.org>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include "pt-machine.h" - -/* Spinlock implementation; required. */ - -/* The SH5 does not have a suitable test-and-set instruction (SWAP only - operates on an aligned quad word). So we use the SH4 version instead. - This must be seperately compiled in SHcompact mode, so it cannot be - inline. */ - -long int testandset (int *spinlock) -{ - int ret; - - __asm__ __volatile__( - "tas.b @%1\n\t" - "movt %0" - : "=r" (ret) - : "r" (spinlock) - : "memory", "cc"); - - return (ret == 0); -} - diff --git a/libpthread/linuxthreads/sysdeps/sh64/pt-machine.h b/libpthread/linuxthreads/sysdeps/sh64/pt-machine.h deleted file mode 100644 index 8269a4cb3..000000000 --- a/libpthread/linuxthreads/sysdeps/sh64/pt-machine.h +++ /dev/null @@ -1,36 +0,0 @@ -/* Cloned for uClibc by Paul Mundt, December 2003 */ -/* Modified by SuperH, Inc. September 2003 */ - -/* Machine-dependent pthreads configuration and inline functions. - SuperH version. - Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Niibe Yutaka <gniibe@m17n.org>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef PT_EI -# define PT_EI extern inline -#endif - -/* Spinlock implementation; required. */ -extern long int testandset (int *spinlock); - - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME stack_pointer -register char * stack_pointer __asm__ ("r15"); diff --git a/libpthread/linuxthreads/sysdeps/sparc/pt-machine.h b/libpthread/linuxthreads/sysdeps/sparc/pt-machine.h deleted file mode 100644 index ab90810f1..000000000 --- a/libpthread/linuxthreads/sysdeps/sparc/pt-machine.h +++ /dev/null @@ -1,8 +0,0 @@ -#include <features.h> -#include <bits/wordsize.h> - -#if __WORDSIZE == 32 -# include "sparc32/pt-machine.h" -#else -# include "sparc64/pt-machine.h" -#endif diff --git a/libpthread/linuxthreads/sysdeps/sparc/sparc32/pt-machine.h b/libpthread/linuxthreads/sysdeps/sparc/sparc32/pt-machine.h deleted file mode 100644 index 322a52051..000000000 --- a/libpthread/linuxthreads/sysdeps/sparc/sparc32/pt-machine.h +++ /dev/null @@ -1,83 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - sparc version. - Copyright (C) 1996-1998, 2000-2003 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Richard Henderson <rth@tamu.edu>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef PT_EI -# define PT_EI extern inline __attribute__ ((always_inline)) -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - int ret; - - __asm__ __volatile__("ldstub %1,%0" - : "=r"(ret), "=m"(*spinlock) - : "m"(*spinlock)); - - return ret; -} - - -/* Memory barrier; default is to do nothing */ -#define MEMORY_BARRIER() __asm__ __volatile__("stbar" : : : "memory") - - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME (stack_pointer + (2 * 64)) -register char *stack_pointer __asm__("%sp"); - - -/* Registers %g6 and %g7 are reserved by the ABI for "system use". - %g7 is specified in the TLS ABI as thread pointer -- we do the same. */ -struct _pthread_descr_struct; -register struct _pthread_descr_struct *__thread_self __asm__("%g7"); - -/* Return the thread descriptor for the current thread. */ -#define THREAD_SELF __thread_self - -/* Initialize the thread-unique value. */ -#define INIT_THREAD_SELF(descr, nr) (__thread_self = (descr)) - -/* Access to data in the thread descriptor is easy. */ -#define THREAD_GETMEM(descr, member) \ - ((void) sizeof (descr), THREAD_SELF->member) -#define THREAD_GETMEM_NC(descr, member) \ - ((void) sizeof (descr), THREAD_SELF->member) -#define THREAD_SETMEM(descr, member, value) \ - ((void) sizeof (descr), THREAD_SELF->member = (value)) -#define THREAD_SETMEM_NC(descr, member, value) \ - ((void) sizeof (descr), THREAD_SELF->member = (value)) - -/* We want the OS to assign stack addresses. */ -#define FLOATING_STACKS 1 - -/* Maximum size of the stack if the rlimit is unlimited. */ -#define ARCH_STACK_MAX_SIZE 8*1024*1024 - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/sparc/sparc64/pt-machine.h b/libpthread/linuxthreads/sysdeps/sparc/sparc64/pt-machine.h deleted file mode 100644 index f65c13be1..000000000 --- a/libpthread/linuxthreads/sysdeps/sparc/sparc64/pt-machine.h +++ /dev/null @@ -1,105 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - Sparc v9 version. - Copyright (C) 1997-2002, 2003 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Richard Henderson <rth@tamu.edu>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If - not, write to the Free Software Foundation, Inc., - 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef PT_EI -# define PT_EI extern inline __attribute__ ((always_inline)) -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - int ret; - - __asm__ __volatile__("ldstub %1,%0" - : "=r" (ret), "=m" (*spinlock) : "m" (*spinlock)); - - return ret; -} - - -/* Memory barrier; default is to do nothing */ -#define MEMORY_BARRIER() \ - __asm__ __volatile__("membar #LoadLoad | #LoadStore | #StoreLoad | #StoreStore" : : : "memory") -/* Read barrier. */ -#define READ_MEMORY_BARRIER() \ - __asm__ __volatile__("membar #LoadLoad | #LoadStore" : : : "memory") -/* Write barrier. */ -#define WRITE_MEMORY_BARRIER() \ - __asm__ __volatile__("membar #StoreLoad | #StoreStore" : : : "memory") - - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME (stack_pointer + (2 * 128)) -register char *stack_pointer __asm__ ("%sp"); - - -/* Registers %g6 and %g7 are reserved by the ABI for "system use". The - TLS ABI specifies %g7 as the thread pointer. */ -struct _pthread_descr_struct; -register struct _pthread_descr_struct *__thread_self __asm__ ("%g7"); - -/* Return the thread descriptor for the current thread. */ -#define THREAD_SELF __thread_self - -/* Initialize the thread-unique value. */ -#define INIT_THREAD_SELF(descr, nr) (__thread_self = (descr)) - - -/* Compare-and-swap for semaphores. */ - -#define HAS_COMPARE_AND_SWAP -PT_EI int -__compare_and_swap (long int *p, long int oldval, long int newval) -{ - long int readval; - - __asm__ __volatile__ ("casx [%4], %2, %0" - : "=r"(readval), "=m"(*p) - : "r"(oldval), "m"(*p), "r"(p), "0"(newval)); - MEMORY_BARRIER(); - return readval == oldval; -} - -/* Access to data in the thread descriptor is easy. */ -#define THREAD_GETMEM(descr, member) \ - ((void) sizeof (descr), THREAD_SELF->member) -#define THREAD_GETMEM_NC(descr, member) \ - ((void) sizeof (descr), THREAD_SELF->member) -#define THREAD_SETMEM(descr, member, value) \ - ((void) sizeof (descr), THREAD_SELF->member = (value)) -#define THREAD_SETMEM_NC(descr, member, value) \ - ((void) sizeof (descr), THREAD_SELF->member = (value)) - -/* We want the OS to assign stack addresses. */ -#define FLOATING_STACKS 1 - -/* Maximum size of the stack if the rlimit is unlimited. */ -#define ARCH_STACK_MAX_SIZE 32*1024*1024 - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/v850/pt-machine.h b/libpthread/linuxthreads/sysdeps/v850/pt-machine.h deleted file mode 100644 index fb41c41e9..000000000 --- a/libpthread/linuxthreads/sysdeps/v850/pt-machine.h +++ /dev/null @@ -1,46 +0,0 @@ -/* - * sysdeps/v850/pt-machine.h -- v850-specific pthread definitions - * - * Copyright (C) 2002 NEC Electronics Corporation - * Copyright (C) 2002 Miles Bader <miles@gnu.org> - * - * This file is subject to the terms and conditions of the GNU Lesser - * General Public License. See the file COPYING.LIB in the main - * directory of this archive for more details. - * - * Written by Miles Bader <miles@gnu.org> - */ - -#ifndef PT_EI -# define PT_EI extern inline -#endif - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME __stack_pointer -register char *__stack_pointer __asm__ ("sp"); - -#define HAS_COMPARE_AND_SWAP - -/* Atomically: If *PTR == OLD, set *PTR to NEW and return true, - otherwise do nothing and return false. */ -PT_EI int -__compare_and_swap (long *ptr, long old, long new) -{ - unsigned long psw; - - /* disable interrupts */ - __asm__ __volatile__ ("stsr psw, %0; di" : "=&r" (psw)); - - if (likely (*ptr == old)) - { - *ptr = new; - __asm__ __volatile__ ("ldsr %0, psw" :: "r" (psw)); /* re-enable */ - return 1; - } - else - { - __asm__ __volatile__ ("ldsr %0, psw" :: "r" (psw)); /* re-enable */ - return 0; - } -} diff --git a/libpthread/linuxthreads/sysdeps/x86_64/pt-machine.h b/libpthread/linuxthreads/sysdeps/x86_64/pt-machine.h deleted file mode 100644 index 8a2d1a762..000000000 --- a/libpthread/linuxthreads/sysdeps/x86_64/pt-machine.h +++ /dev/null @@ -1,86 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - x86-64 version. - Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef __ASSEMBLER__ -# include <stddef.h> /* For offsetof. */ -# include <stdlib.h> /* For abort(). */ -# include <asm/prctl.h> - - -# ifndef PT_EI -# define PT_EI extern inline __attribute__ ((always_inline)) -# endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -# define CURRENT_STACK_FRAME stack_pointer -register char * stack_pointer __asm__ ("%rsp") __attribute_used__; - - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - long int ret; - - __asm__ __volatile__ ( - "xchgl %k0, %1" - : "=r"(ret), "=m"(*spinlock) - : "0"(1), "m"(*spinlock) - : "memory"); - - return ret; -} - - -/* Compare-and-swap for semaphores. */ -# define HAS_COMPARE_AND_SWAP - -PT_EI int -__compare_and_swap (long int *p, long int oldval, long int newval) -{ - char ret; - long int readval; - - __asm__ __volatile__ ("lock; cmpxchgq %3, %1; sete %0" - : "=q" (ret), "=m" (*p), "=a" (readval) - : "r" (newval), "m" (*p), "a" (oldval) - : "memory"); - return ret; -} - -#endif /* !__ASSEMBLER__ */ - -/* We want the OS to assign stack addresses. */ -#define FLOATING_STACKS 1 - -/* Maximum size of the stack if the rlimit is unlimited. */ -#define ARCH_STACK_MAX_SIZE 32*1024*1024 - -/* The ia32e really want some help to prevent overheating. */ -#define BUSY_WAIT_NOP __asm__ ("rep; nop") - -#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/x86_64/tls.h b/libpthread/linuxthreads/sysdeps/x86_64/tls.h deleted file mode 100644 index d67275c10..000000000 --- a/libpthread/linuxthreads/sysdeps/x86_64/tls.h +++ /dev/null @@ -1,134 +0,0 @@ -/* Definitions for thread-local data handling. linuxthreads/x86-64 version. - Copyright (C) 2002, 2005 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#ifndef _TLS_H -#define _TLS_H - -#ifndef __ASSEMBLER__ - -# include <pt-machine.h> -# include <stdbool.h> -# include <stddef.h> - -/* Type for the dtv. */ -typedef union dtv -{ - size_t counter; - struct - { - void *val; - bool is_static; - } pointer; -} dtv_t; - - -typedef struct -{ - void *tcb; /* Pointer to the TCB. Not necessary the - thread descriptor used by libpthread. */ - dtv_t *dtv; - void *self; /* Pointer to the thread descriptor. */ - int multiple_threads; -} tcbhead_t; - -#else /* __ASSEMBLER__ */ -# include <tcb-offsets.h> -#endif - - -#ifdef HAVE_TLS_SUPPORT - -/* Signal that TLS support is available. */ -# define USE_TLS 1 - -# ifndef __ASSEMBLER__ -/* Get system call information. */ -# include <sysdep.h> - -/* Get the thread descriptor definition. */ -# include <linuxthreads/descr.h> - -/* This is the size of the initial TCB. */ -# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) - -/* Alignment requirements for the initial TCB. */ -# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) - -/* This is the size of the TCB. */ -# define TLS_TCB_SIZE sizeof (struct _pthread_descr_struct) - -/* Alignment requirements for the TCB. */ -# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct) - -/* The TCB can have any size and the memory following the address the - thread pointer points to is unspecified. Allocate the TCB there. */ -# define TLS_TCB_AT_TP 1 - - -/* Install the dtv pointer. The pointer passed is to the element with - index -1 which contain the length. */ -# define INSTALL_DTV(descr, dtvp) \ - ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 - -/* Install new dtv for current thread. */ -# define INSTALL_NEW_DTV(dtv) \ - ({ struct _pthread_descr_struct *__descr; \ - THREAD_SETMEM (__descr, p_header.data.dtvp, (dtv)); }) - -/* Return dtv of given thread descriptor. */ -# define GET_DTV(descr) \ - (((tcbhead_t *) (descr))->dtv) - -/* Code to initially initialize the thread pointer. This might need - special attention since 'errno' is not yet available and if the - operation can cause a failure 'errno' must not be touched. */ -# define TLS_INIT_TP(descr, secondcall) \ - ({ \ - void *_descr = (descr); \ - tcbhead_t *head = _descr; \ - long int _result; \ - \ - head->tcb = _descr; \ - /* For now the thread descriptor is at the same address. */ \ - head->self = _descr; \ - \ - asm volatile ("syscall" \ - : "=a" (_result) \ - : "0" ((unsigned long int) __NR_arch_prctl), \ - "D" ((unsigned long int) ARCH_SET_FS), \ - "S" (_descr) \ - : "memory", "cc", "r11", "cx"); \ - \ - _result ? "cannot set %fs base address for thread-local storage" : 0; \ - }) - -/* Indicate that dynamic linker shouldn't try to initialize TLS even - when no PT_TLS segments are found in the program and libraries - it is linked against. */ -# define TLS_INIT_TP_EXPENSIVE 1 - -/* Return the address of the dtv for the current thread. */ -# define THREAD_DTV() \ - ({ struct _pthread_descr_struct *__descr; \ - THREAD_GETMEM (__descr, p_header.data.dtvp); }) - -# endif /* HAVE_TLS_SUPPORT */ -#endif /* __ASSEMBLER__ */ - -#endif /* tls.h */ diff --git a/libpthread/linuxthreads/wrapsyscall.c b/libpthread/linuxthreads/wrapsyscall.c deleted file mode 100644 index 6b8a00bb5..000000000 --- a/libpthread/linuxthreads/wrapsyscall.c +++ /dev/null @@ -1,220 +0,0 @@ -/* Wrapper arpund system calls to provide cancelation points. - Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#define __FORCE_GLIBC -#include <features.h> -#include <fcntl.h> -#include <sys/mman.h> -#include <pthread.h> -#include <unistd.h> -#include <stdarg.h> -#include <stddef.h> -#include <stdlib.h> -#include <termios.h> -#include <sys/resource.h> -#include <sys/wait.h> -#include <sys/socket.h> -#include <sys/syscall.h> - - -#ifndef __PIC__ -/* We need a hook to force this file to be linked in when static - libpthread is used. */ -const int __pthread_provide_wrappers = 0; -#endif - - -#define CANCELABLE_SYSCALL(res_type, name, param_list, params) \ -res_type __libc_##name param_list; \ -res_type \ -__attribute__ ((weak)) \ -name param_list \ -{ \ - res_type result; \ - int oldtype; \ - pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, &oldtype); \ - result = __libc_##name params; \ - pthread_setcanceltype (oldtype, NULL); \ - return result; \ -} - -#define CANCELABLE_SYSCALL_VA(res_type, name, param_list, params, last_arg) \ -res_type __libc_##name param_list; \ -res_type \ -__attribute__ ((weak)) \ -name param_list \ -{ \ - res_type result; \ - int oldtype; \ - va_list ap; \ - pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, &oldtype); \ - va_start (ap, last_arg); \ - result = __libc_##name params; \ - va_end (ap); \ - pthread_setcanceltype (oldtype, NULL); \ - return result; \ -} - - -/* close(2). */ -CANCELABLE_SYSCALL (int, close, (int fd), (fd)) - - -/* fcntl(2). */ -CANCELABLE_SYSCALL_VA (int, fcntl, (int fd, int cmd, ...), - (fd, cmd, va_arg (ap, long int)), cmd) - - -/* fsync(2). */ -CANCELABLE_SYSCALL (int, fsync, (int fd), (fd)) - - -/* lseek(2). */ -CANCELABLE_SYSCALL (off_t, lseek, (int fd, off_t offset, int whence), - (fd, offset, whence)) - -#ifdef __UCLIBC_HAS_LFS__ -/* lseek64(2). */ -CANCELABLE_SYSCALL (off64_t, lseek64, (int fd, off64_t offset, int whence), - (fd, offset, whence)) -#endif - -/* msync(2). */ -CANCELABLE_SYSCALL (int, msync, (__ptr_t addr, size_t length, int flags), - (addr, length, flags)) - - -/* nanosleep(2). */ -CANCELABLE_SYSCALL (int, nanosleep, (const struct timespec *requested_time, - struct timespec *remaining), - (requested_time, remaining)) - - -/* open(2). */ -CANCELABLE_SYSCALL_VA (int, open, (const char *pathname, int flags, ...), - (pathname, flags, va_arg (ap, mode_t)), flags) - - -#ifdef __UCLIBC_HAS_LFS__ -/* open64(3). */ -CANCELABLE_SYSCALL_VA (int, open64, (const char *pathname, int flags, ...), - (pathname, flags, va_arg (ap, mode_t)), flags) -#endif - -/* pause(2). */ -CANCELABLE_SYSCALL (int, pause, (void), ()) - - -/* Enable this if enabling these in syscalls.c */ -/* pread(3). */ -CANCELABLE_SYSCALL (ssize_t, pread, (int fd, void *buf, size_t count, - off_t offset), - (fd, buf, count, offset)) - - -#if defined __UCLIBC_HAS_LFS__ && defined __NR_pread64 -/* pread64(3). */ -CANCELABLE_SYSCALL (ssize_t, pread64, (int fd, void *buf, size_t count, - off64_t offset), - (fd, buf, count, offset)) -#endif - -/* pwrite(3). */ -CANCELABLE_SYSCALL (ssize_t, pwrite, (int fd, const void *buf, size_t n, - off_t offset), - (fd, buf, n, offset)) - - -#if defined __UCLIBC_HAS_LFS__ && defined __NR_pwrited64 -/* pwrite64(3). */ -CANCELABLE_SYSCALL (ssize_t, pwrite64, (int fd, const void *buf, size_t n, - off64_t offset), - (fd, buf, n, offset)) -#endif - -/* read(2). */ -CANCELABLE_SYSCALL (ssize_t, read, (int fd, void *buf, size_t count), - (fd, buf, count)) - - -/* system(3). */ -CANCELABLE_SYSCALL (int, system, (const char *line), (line)) - - -/* tcdrain(2). */ -CANCELABLE_SYSCALL (int, tcdrain, (int fd), (fd)) - - -/* wait(2). */ -CANCELABLE_SYSCALL (__pid_t, wait, (__WAIT_STATUS_DEFN stat_loc), (stat_loc)) - - -/* waitpid(2). */ -CANCELABLE_SYSCALL (__pid_t, waitpid, (__pid_t pid, int *stat_loc, - int options), - (pid, stat_loc, options)) - - -/* write(2). */ -CANCELABLE_SYSCALL (ssize_t, write, (int fd, const void *buf, size_t n), - (fd, buf, n)) - - -/* The following system calls are thread cancellation points specified - in XNS. */ - -/* accept(2). */ -CANCELABLE_SYSCALL (int, accept, (int fd, __SOCKADDR_ARG addr, - socklen_t *addr_len), - (fd, addr, addr_len)) - -/* connect(2). */ -CANCELABLE_SYSCALL (int, connect, (int fd, __CONST_SOCKADDR_ARG addr, - socklen_t len), - (fd, addr, len)) - -/* recv(2). */ -CANCELABLE_SYSCALL (ssize_t, recv, (int fd, __ptr_t buf, size_t n, int flags), - (fd, buf, n, flags)) - -/* recvfrom(2). */ -CANCELABLE_SYSCALL (ssize_t, recvfrom, (int fd, __ptr_t buf, size_t n, int flags, - __SOCKADDR_ARG addr, socklen_t *addr_len), - (fd, buf, n, flags, addr, addr_len)) - -/* recvmsg(2). */ -CANCELABLE_SYSCALL (ssize_t, recvmsg, (int fd, struct msghdr *message, int flags), - (fd, message, flags)) - -/* send(2). */ -CANCELABLE_SYSCALL (ssize_t, send, (int fd, const __ptr_t buf, size_t n, - int flags), - (fd, buf, n, flags)) - -/* sendmsg(2). */ -CANCELABLE_SYSCALL (ssize_t, sendmsg, (int fd, const struct msghdr *message, - int flags), - (fd, message, flags)) - -/* sendto(2). */ -CANCELABLE_SYSCALL (ssize_t, sendto, (int fd, const __ptr_t buf, size_t n, - int flags, __CONST_SOCKADDR_ARG addr, - socklen_t addr_len), - (fd, buf, n, flags, addr, addr_len)) |