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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc2/] [libgomp/] [config/] [linux/] [mutex.h] - Rev 387
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/* Copyright (C) 2005, 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/>. */ /* This is a Linux specific implementation of a mutex synchronization mechanism for libgomp. This type is private to the library. This implementation uses atomic instructions and the futex syscall. */ #ifndef GOMP_MUTEX_H #define GOMP_MUTEX_H 1 typedef int gomp_mutex_t; #define GOMP_MUTEX_INIT_0 1 static inline void gomp_mutex_init (gomp_mutex_t *mutex) { *mutex = 0; } extern void gomp_mutex_lock_slow (gomp_mutex_t *mutex); static inline void gomp_mutex_lock (gomp_mutex_t *mutex) { if (!__sync_bool_compare_and_swap (mutex, 0, 1)) gomp_mutex_lock_slow (mutex); } extern void gomp_mutex_unlock_slow (gomp_mutex_t *mutex); static inline void gomp_mutex_unlock (gomp_mutex_t *mutex) { /* Warning: By definition __sync_lock_test_and_set() does not have proper memory barrier semantics for a mutex unlock operation. However, this default implementation is written assuming that it does, which is true for some targets. Targets that require additional memory barriers before __sync_lock_test_and_set to achieve the release semantics of mutex unlock, are encouraged to include "config/linux/ia64/mutex.h" in a target specific mutex.h instead of using this file. */ int val = __sync_lock_test_and_set (mutex, 0); if (__builtin_expect (val > 1, 0)) gomp_mutex_unlock_slow (mutex); } static inline void gomp_mutex_destroy (gomp_mutex_t *mutex) { } #endif /* GOMP_MUTEX_H */
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