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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc1/] [libgomp/] [config/] [linux/] [x86/] [futex.h] - Rev 273
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/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc. Contributed by Richard Henderson <rth@redhat.com>. This file is part of the GNU OpenMP Library (libgomp). Libgomp is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. Libgomp 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 General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ /* Provide target-specific access to the futex system call. */ #ifdef __LP64__ # ifndef SYS_futex # define SYS_futex 202 # endif static inline void futex_wait (int *addr, int val) { register long r10 __asm__("%r10"); long res; r10 = 0; __asm volatile ("syscall" : "=a" (res) : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait), "d" (val), "r" (r10) : "r11", "rcx", "memory"); if (__builtin_expect (res == -ENOSYS, 0)) { gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; r10 = 0; __asm volatile ("syscall" : "=a" (res) : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait), "d" (val), "r" (r10) : "r11", "rcx", "memory"); } } static inline void futex_wake (int *addr, int count) { long res; __asm volatile ("syscall" : "=a" (res) : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake), "d" (count) : "r11", "rcx", "memory"); if (__builtin_expect (res == -ENOSYS, 0)) { gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; __asm volatile ("syscall" : "=a" (res) : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake), "d" (count) : "r11", "rcx", "memory"); } } #else # ifndef SYS_futex # define SYS_futex 240 # endif # ifdef __PIC__ static inline long sys_futex0 (int *addr, int op, int val) { long res; __asm volatile ("xchgl\t%%ebx, %2\n\t" "int\t$0x80\n\t" "xchgl\t%%ebx, %2" : "=a" (res) : "0"(SYS_futex), "r" (addr), "c"(op), "d"(val), "S"(0) : "memory"); return res; } # else static inline long sys_futex0 (int *addr, int op, int val) { long res; __asm volatile ("int $0x80" : "=a" (res) : "0"(SYS_futex), "b" (addr), "c"(op), "d"(val), "S"(0) : "memory"); return res; } # endif /* __PIC__ */ static inline void futex_wait (int *addr, int val) { long res = sys_futex0 (addr, gomp_futex_wait, val); if (__builtin_expect (res == -ENOSYS, 0)) { gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; sys_futex0 (addr, gomp_futex_wait, val); } } static inline void futex_wake (int *addr, int count) { long res = sys_futex0 (addr, gomp_futex_wake, count); if (__builtin_expect (res == -ENOSYS, 0)) { gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; sys_futex0 (addr, gomp_futex_wake, count); } } #endif /* __LP64__ */ static inline void cpu_relax (void) { __asm volatile ("rep; nop" : : : "memory"); } static inline void atomic_write_barrier (void) { __sync_synchronize (); }
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