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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [libgomp/] [config/] [posix/] [ptrlock.h] - Rev 280
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/* Copyright (C) 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/>. */ /* 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_PTRLOCK_H #define GOMP_PTRLOCK_H 1 typedef struct { void *ptr; gomp_mutex_t lock; } gomp_ptrlock_t; static inline void gomp_ptrlock_init (gomp_ptrlock_t *ptrlock, void *ptr) { ptrlock->ptr = ptr; gomp_mutex_init (&ptrlock->lock); } static inline void *gomp_ptrlock_get (gomp_ptrlock_t *ptrlock) { if (ptrlock->ptr != NULL) return ptrlock->ptr; gomp_mutex_lock (&ptrlock->lock); if (ptrlock->ptr != NULL) { gomp_mutex_unlock (&ptrlock->lock); return ptrlock->ptr; } return NULL; } static inline void gomp_ptrlock_set (gomp_ptrlock_t *ptrlock, void *ptr) { ptrlock->ptr = ptr; gomp_mutex_unlock (&ptrlock->lock); } static inline void gomp_ptrlock_destroy (gomp_ptrlock_t *ptrlock) { gomp_mutex_destroy (&ptrlock->lock); } #endif /* GOMP_PTRLOCK_H */
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