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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc1/] [libgomp/] [config/] [linux/] [s390/] [futex.h] - Rev 273
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/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc. Contributed by Jakub Jelinek <jakub@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. */ #include <sys/syscall.h> static inline long sys_futex0 (int *addr, int op, int val) { register long int gpr2 __asm__ ("2"); register long int gpr3 __asm__ ("3"); register long int gpr4 __asm__ ("4"); register long int gpr5 __asm__ ("5"); gpr2 = (long) addr; gpr3 = op; gpr4 = val; gpr5 = 0; __asm volatile ("svc %b1" : "=d" (gpr2) : "i" (SYS_futex), "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5) : "memory"); return gpr2; } static inline void futex_wait (int *addr, int val) { long err = sys_futex0 (addr, gomp_futex_wait, val); if (__builtin_expect (err == -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 err = sys_futex0 (addr, gomp_futex_wake, count); if (__builtin_expect (err == -ENOSYS, 0)) { gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; sys_futex0 (addr, gomp_futex_wake, count); } } static inline void cpu_relax (void) { __asm volatile ("" : : : "memory"); } static inline void atomic_write_barrier (void) { __sync_synchronize (); }
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