diff options
Diffstat (limited to 'libpthread/linuxthreads/sysdeps/powerpc/pt-machine.h')
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/powerpc/pt-machine.h | 82 |
1 files changed, 53 insertions, 29 deletions
diff --git a/libpthread/linuxthreads/sysdeps/powerpc/pt-machine.h b/libpthread/linuxthreads/sysdeps/powerpc/pt-machine.h index 578369a7f..19b77b7e6 100644 --- a/libpthread/linuxthreads/sysdeps/powerpc/pt-machine.h +++ b/libpthread/linuxthreads/sysdeps/powerpc/pt-machine.h @@ -1,19 +1,19 @@ /* Machine-dependent pthreads configuration and inline functions. powerpc version. - Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. + 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 Library General Public License as - published by the Free Software Foundation; either version 2 of the + 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 - Library General Public License for more details. + Lesser General Public License for more details. - You should have received a copy of the GNU Library General Public + 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. */ @@ -21,18 +21,20 @@ /* 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. */ -#if 0 -/* on non multiprocessor systems, you can just: */ -#define sync() /* nothing */ -#else -#define sync() __asm__ __volatile__ ("sync") -#endif + 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. */ @@ -40,30 +42,52 @@ register char * stack_pointer __asm__ ("r1"); /* Compare-and-swap for semaphores. */ -/* note that test-and-set(x) is the same as compare-and-swap(x, 0, 1) */ +/* note that test-and-set(x) is the same as !compare-and-swap(x, 0, 1) */ -#define HAS_COMPARE_AND_SWAP -#if BROKEN_PPC_ASM_CR0 -static -#else -PT_EI -#endif -int +#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; - sync(); - __asm__ __volatile__( - "0: lwarx %0,0,%1 ;" - " xor. %0,%3,%0;" - " bne 1f;" - " stwcx. %2,0,%1;" - " bne- 0b;" - "1: " + __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"); - sync(); + /* 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 */ |