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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc3/] [libgomp/] [config/] [linux/] [mips/] [futex.h] - Rev 516
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/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc. Contributed by Ilie Garbacea <ilie@mips.com>, Chao-ying Fu <fu@mips.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> #define FUTEX_WAIT 0 #define FUTEX_WAKE 1 static inline void sys_futex0 (int *addr, int op, int val) { register unsigned long __v0 asm("$2") = (unsigned long) SYS_futex; register unsigned long __a0 asm("$4") = (unsigned long) addr; register unsigned long __a1 asm("$5") = (unsigned long) op; register unsigned long __a2 asm("$6") = (unsigned long) val; register unsigned long __a3 asm("$7") = 0; __asm volatile ("syscall" /* returns $a3 (errno), $v0 (return value) */ : "=r" (__v0), "=r" (__a3) /* arguments in v0 (syscall) a0-a3 */ : "r" (__v0), "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a3) /* clobbers at, v1, t0-t9, memory */ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "memory"); } static inline void futex_wait (int *addr, int val) { sys_futex0 (addr, FUTEX_WAIT, val); } static inline void futex_wake (int *addr, int count) { sys_futex0 (addr, FUTEX_WAKE, count); } static inline void cpu_relax (void) { __asm volatile ("" : : : "memory"); } static inline void atomic_write_barrier (void) { __sync_synchronize (); }