From 6321510368dffba1e4748233e7143f315d150484 Mon Sep 17 00:00:00 2001 From: "\"Steven J. Hill\"" Date: Thu, 26 May 2005 02:17:02 +0000 Subject: libpthread/nptl/sysdeps/unix/sysv/linux/libc_multiple_threads.c libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/bits libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/bits/semaphore.h libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/fork.c libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc32 libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep-cancel.h libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc32/clone.S libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc32/vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc32/pt-vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/Versions libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/pt-longjmp.c libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/not-cancel.h libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64 libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/timer_gettime.c libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/timer_delete.c libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/timer_create.c libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/pt-vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/timer_settime.c libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/timer_getoverr.c libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/createthread.c libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/pthread_once.c libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/Makefile 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libpthread/nptl/sysdeps/unix/sysv/linux/ia64/Makefile libpthread/nptl/sysdeps/unix/sysv/linux/ia64/timer_getoverr.c libpthread/nptl/sysdeps/unix/sysv/linux/pt-fork.c libpthread/nptl/sysdeps/unix/sysv/linux/pt-raise.c libpthread/nptl/sysdeps/unix/sysv/linux/kernel-posix-timers.h libpthread/nptl/sysdeps/unix/sysv/linux/lowlevelbarrier.sym libpthread/nptl/sysdeps/unix/sysv/linux/sparc/bits/local_lim.h libpthread/nptl/sysdeps/unix/sysv/linux/sparc/bits/pthreadtypes.h libpthread/nptl/sysdeps/unix/sysv/linux/sparc/bits/semaphore.h libpthread/nptl/sysdeps/unix/sysv/linux/sparc/fork.c libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/timer_gettime.c libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep-cancel.h libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/clone.S libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/timer_delete.c libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/timer_create.c libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/Versions libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/pt-vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/timer_settime.c libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/timer_getoverr.c libpthread/nptl/sysdeps/unix/sysv/linux/sparc/Versions libpthread/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h libpthread/nptl/sysdeps/unix/sysv/linux/sparc/not-cancel.h libpthread/nptl/sysdeps/unix/sysv/linux/sparc/pthread_once.c libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc32 libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep-cancel.h libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc32/clone.S libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc32/vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/sparc/sparc32/pt-vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/sparc/aio_cancel.c libpthread/nptl/sysdeps/unix/sysv/linux/mips/sysdep-cancel.h libpthread/nptl/sysdeps/unix/sysv/linux/mips/clone.S libpthread/nptl/sysdeps/unix/sysv/linux/mips/bits libpthread/nptl/sysdeps/unix/sysv/linux/mips/bits/pthreadtypes.h libpthread/nptl/sysdeps/unix/sysv/linux/mips/bits/semaphore.h libpthread/nptl/sysdeps/unix/sysv/linux/mips/fork.c libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h libpthread/nptl/sysdeps/unix/sysv/linux/mips/vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/mips/pt-vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/mips/createthread.c libpthread/nptl/sysdeps/unix/sysv/linux/mips/pthread_once.c libpthread/nptl/sysdeps/unix/sysv/linux/pthread_getcpuclockid.c libpthread/nptl/sysdeps/unix/sysv/linux/jmp-unwind.c libpthread/nptl/sysdeps/unix/sysv/linux/aio_misc.h libpthread/nptl/sysdeps/unix/sysv/linux/sem_post.c libpthread/nptl/sysdeps/unix/sysv/linux/sigtimedwait.c libpthread/nptl/sysdeps/unix/sysv/linux/createthread.c libpthread/nptl/sysdeps/unix/sysv/linux/Makefile libpthread/nptl/sysdeps/unix/sysv/linux/timer_gettime.c libpthread/nptl/sysdeps/unix/sysv/linux/lowlevelrwlock.sym libpthread/nptl/sysdeps/unix/sysv/linux/lowlevellock.c libpthread/nptl/sysdeps/unix/sysv/linux/timer_delete.c libpthread/nptl/sysdeps/unix/sysv/linux/raise.c libpthread/nptl/sysdeps/unix/sysv/linux/allocrtsig.c libpthread/nptl/sysdeps/unix/sysv/linux/libc_pthread_init.c libpthread/nptl/sysdeps/unix/sysv/linux/timer_create.c libpthread/nptl/sysdeps/unix/sysv/linux/sigwait.c libpthread/nptl/sysdeps/unix/sysv/linux/sem_wait.c libpthread/nptl/sysdeps/unix/sysv/linux/i386/sysdep-cancel.h libpthread/nptl/sysdeps/unix/sysv/linux/i386/fork.c libpthread/nptl/sysdeps/unix/sysv/linux/i386/pthread_spin_init.c libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h libpthread/nptl/sysdeps/unix/sysv/linux/i386/vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/dl-sysdep.h libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_barrier_wait.S 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libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/pthread_cond_wait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/pthread_barrier_wait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/pthread_rwlock_unlock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/pthread_cond_signal.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/pthread_rwlock_timedrdlock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/pthread_rwlock_wrlock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/sem_post.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/sem_timedwait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/pthread_cond_timedwait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/lowlevellock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/pthread_rwlock_rdlock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/sem_trywait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/sem_wait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/libc-lowlevellock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/pthread_rwlock_timedwrlock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i586/pthread_cond_broadcast.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/pthread_cond_wait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/pthread_barrier_wait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/pthread_rwlock_unlock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/pthread_cond_signal.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/dl-sysdep.h libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/pthread_rwlock_timedrdlock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/pthread_rwlock_wrlock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/sem_post.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/sem_timedwait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/pthread_cond_timedwait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/lowlevellock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/pthread_rwlock_rdlock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/sem_trywait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/sem_wait.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/libc-lowlevellock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/pthread_rwlock_timedwrlock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/i686/pthread_cond_broadcast.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/pthread_once.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/pthread_spin_unlock.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/clone.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/bits/pthreadtypes.h libpthread/nptl/sysdeps/unix/sysv/linux/i386/bits/semaphore.h libpthread/nptl/sysdeps/unix/sysv/linux/i386/not-cancel.h libpthread/nptl/sysdeps/unix/sysv/linux/i386/pt-vfork.S libpthread/nptl/sysdeps/unix/sysv/linux/i386/createthread.c libpthread/nptl/sysdeps/unix/sysv/linux/libc-lowlevellock.c libpthread/nptl/sysdeps/unix/sysv/linux/pthread_attr_getaffinity.c 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libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c libpthread/nptl/sysdeps/pthread/pthread_rwlock_timedrdlock.c libpthread/nptl/sysdeps/pthread/pthread_once.c libpthread/nptl/sysdeps/pthread/createthread.c libpthread/nptl/sysdeps/pthread/Makefile libpthread/nptl/sysdeps/pthread/pthread.h libpthread/nptl/sysdeps/pthread/timer_gettime.c libpthread/nptl/sysdeps/pthread/flockfile.c libpthread/nptl/sysdeps/pthread/funlockfile.c libpthread/nptl/sysdeps/pthread/timer_delete.c libpthread/nptl/sysdeps/pthread/pthread-functions.h libpthread/nptl/sysdeps/pthread/allocalim.h libpthread/nptl/sysdeps/pthread/pthread_spin_init.c libpthread/nptl/sysdeps/pthread/timer_create.c libpthread/nptl/sysdeps/pthread/setxid.h libpthread/nptl/sysdeps/pthread/pthread_sigmask.c libpthread/nptl/sysdeps/pthread/configure.in libpthread/nptl/sysdeps/pthread/librt-cancellation.c libpthread/nptl/sysdeps/pthread/timer_settime.c libpthread/nptl/sysdeps/pthread/pthread_cond_wait.c libpthread/nptl/sysdeps/pthread/sigaction.c libpthread/nptl/sysdeps/pthread/sigprocmask.c libpthread/nptl/sysdeps/pthread/pthread_rwlock_unlock.c libpthread/nptl/sysdeps/pthread/rt-unwind-resume.c libpthread/nptl/sysdeps/pthread/posix-timer.h libpthread/nptl/sysdeps/pthread/pthread_rwlock_wrlock.c libpthread/nptl/sysdeps/pthread/pthread_spin_destroy.c libpthread/nptl/sysdeps/pthread/pt-initfini.c libpthread/nptl/sysdeps/pthread/Subdirs libpthread/nptl/sysdeps/pthread/pthread_spin_unlock.c libpthread/nptl/sysdeps/pthread/ftrylockfile.c libpthread/nptl/sysdeps/pthread/timer_getoverr.c libpthread/nptl/sysdeps/generic/pt-raise.c libpthread/nptl/sysdeps/generic/lowlevellock.h --- .../nptl/sysdeps/unix/sysv/linux/mq_notify.c | 287 +++++++++++++++++++++ 1 file changed, 287 insertions(+) create mode 100644 libpthread/nptl/sysdeps/unix/sysv/linux/mq_notify.c (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/mq_notify.c') diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/mq_notify.c b/libpthread/nptl/sysdeps/unix/sysv/linux/mq_notify.c new file mode 100644 index 000000000..e9c2b6e79 --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/mq_notify.c @@ -0,0 +1,287 @@ +/* Copyright (C) 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contribute by Ulrich Drepper , 2004. + + 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. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#ifdef __NR_mq_notify + +/* Defined in the kernel headers: */ +#define NOTIFY_COOKIE_LEN 32 /* Length of the cookie used. */ +#define NOTIFY_WOKENUP 1 /* Code for notifcation. */ +#define NOTIFY_REMOVED 2 /* Code for closed message queue + of de-notifcation. */ + + +/* Data structure for the queued notification requests. */ +union notify_data +{ + struct + { + void (*fct) (union sigval); /* The function to run. */ + union sigval param; /* The parameter to pass. */ + pthread_attr_t *attr; /* Attributes to create the thread with. */ + /* NB: on 64-bit machines the struct as a size of 24 bytes. Which means + byte 31 can still be used for returning the status. */ + }; + char raw[NOTIFY_COOKIE_LEN]; +}; + + +/* Keep track of the initialization. */ +static pthread_once_t once = PTHREAD_ONCE_INIT; + + +/* The netlink socket. */ +static int netlink_socket = -1; + + +/* Barrier used to make sure data passed to the new thread is not + resused by the parent. */ +static pthread_barrier_t notify_barrier; + + +/* Modify the signal mask. We move this into a separate function so + that the stack space needed for sigset_t is not deducted from what + the thread can use. */ +static int +__attribute__ ((noinline)) +change_sigmask (int how, sigset_t *oss) +{ + sigset_t ss; + sigfillset (&ss); + return pthread_sigmask (how, &ss, oss); +} + + +/* The function used for the notification. */ +static void * +notification_function (void *arg) +{ + /* Copy the function and parameter so that the parent thread can go + on with its life. */ + volatile union notify_data *data = (volatile union notify_data *) arg; + void (*fct) (union sigval) = data->fct; + union sigval param = data->param; + + /* Let the parent go. */ + (void) pthread_barrier_wait (¬ify_barrier); + + /* Make the thread detached. */ + (void) pthread_detach (pthread_self ()); + + /* The parent thread has all signals blocked. This is probably a + bit surprising for this thread. So we unblock all of them. */ + (void) change_sigmask (SIG_UNBLOCK, NULL); + + /* Now run the user code. */ + fct (param); + + /* And we are done. */ + return NULL; +} + + +/* Helper thread. */ +static void * +helper_thread (void *arg) +{ + while (1) + { + union notify_data data; + + ssize_t n = recv (netlink_socket, &data, sizeof (data), + MSG_NOSIGNAL | MSG_WAITALL); + if (n < NOTIFY_COOKIE_LEN) + continue; + + if (data.raw[NOTIFY_COOKIE_LEN - 1] == NOTIFY_WOKENUP) + { + /* Just create the thread as instructed. There is no way to + report a problem with creating a thread. */ + pthread_t th; + if (__builtin_expect (pthread_create (&th, data.attr, + notification_function, &data) + == 0, 0)) + /* Since we passed a pointer to DATA to the new thread we have + to wait until it is done with it. */ + (void) pthread_barrier_wait (¬ify_barrier); + } + else if (data.raw[NOTIFY_COOKIE_LEN - 1] == NOTIFY_REMOVED) + /* The only state we keep is the copy of the thread attributes. */ + free (data.attr); + } + return NULL; +} + + +static void +reset_once (void) +{ + once = PTHREAD_ONCE_INIT; +} + + +static void +init_mq_netlink (void) +{ + /* This code might be called a second time after fork(). The file + descriptor is inherited from the parent. */ + if (netlink_socket == -1) + { + /* Just a normal netlink socket, not bound. */ + netlink_socket = socket (AF_NETLINK, SOCK_RAW, 0); + /* No need to do more if we have no socket. */ + if (netlink_socket == -1) + return; + + /* Make sure the descriptor is closed on exec. */ + if (fcntl (netlink_socket, F_SETFD, FD_CLOEXEC) != 0) + goto errout; + } + + int err = 1; + + /* Initialize the barrier. */ + if (__builtin_expect (pthread_barrier_init (¬ify_barrier, NULL, 2) == 0, + 0)) + { + /* Create the helper thread. */ + pthread_attr_t attr; + (void) pthread_attr_init (&attr); + (void) pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); + /* We do not need much stack space, the bare minimum will be enough. */ + (void) pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN); + + /* Temporarily block all signals so that the newly created + thread inherits the mask. */ + sigset_t oss; + int have_no_oss = change_sigmask (SIG_BLOCK, &oss); + + pthread_t th; + err = pthread_create (&th, &attr, helper_thread, NULL); + + /* Reset the signal mask. */ + if (!have_no_oss) + pthread_sigmask (SIG_SETMASK, &oss, NULL); + + (void) pthread_attr_destroy (&attr); + + if (err == 0) + { + static int added_atfork; + + if (added_atfork == 0 + && pthread_atfork (NULL, NULL, reset_once) != 0) + { + /* The child thread will call recv() which is a + cancellation point. */ + (void) pthread_cancel (th); + err = 1; + } + else + added_atfork = 1; + } + } + + if (err != 0) + { + errout: + close_not_cancel_no_status (netlink_socket); + netlink_socket = -1; + } +} + + +/* Register notification upon message arrival to an empty message queue + MQDES. */ +int +mq_notify (mqd_t mqdes, const struct sigevent *notification) +{ + /* Make sure the type is correctly defined. */ + assert (sizeof (union notify_data) == NOTIFY_COOKIE_LEN); + + /* Special treatment needed for SIGEV_THREAD. */ + if (notification == NULL || notification->sigev_notify != SIGEV_THREAD) + return INLINE_SYSCALL (mq_notify, 2, mqdes, notification); + + /* The kernel cannot directly start threads. This will have to be + done at userlevel. Since we cannot start threads from signal + handlers we have to create a dedicated thread which waits for + notifications for arriving messages and creates threads in + response. */ + + /* Initialize only once. */ + pthread_once (&once, init_mq_netlink); + + /* If we cannot create the netlink socket we cannot provide + SIGEV_THREAD support. */ + if (__builtin_expect (netlink_socket == -1, 0)) + { + __set_errno (ENOSYS); + return -1; + } + + /* Create the cookie. It will hold almost all the state. */ + union notify_data data; + memset (&data, '\0', sizeof (data)); + data.fct = notification->sigev_notify_function; + data.param = notification->sigev_value; + + if (notification->sigev_notify_attributes != NULL) + { + /* The thread attribute has to be allocated separately. */ + data.attr = (pthread_attr_t *) malloc (sizeof (pthread_attr_t)); + if (data.attr == NULL) + return -1; + + memcpy (data.attr, notification->sigev_notify_attributes, + sizeof (pthread_attr_t)); + } + + /* Construct the new request. */ + struct sigevent se; + se.sigev_notify = SIGEV_THREAD; + se.sigev_signo = netlink_socket; + se.sigev_value.sival_ptr = &data; + + /* Tell the kernel. */ + int retval = INLINE_SYSCALL (mq_notify, 2, mqdes, &se); + + /* If it failed, free the allocated memory. */ + if (__builtin_expect (retval != 0, 0)) + free (data.attr); + + return retval; +} + +#else +# include +#endif -- cgit v1.2.3