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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc3/] [libgomp/] [config/] [linux/] [ptrlock.h] - Rev 273
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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 void *gomp_ptrlock_t; static inline void gomp_ptrlock_init (gomp_ptrlock_t *ptrlock, void *ptr) { *ptrlock = ptr; } extern void *gomp_ptrlock_get_slow (gomp_ptrlock_t *ptrlock); static inline void *gomp_ptrlock_get (gomp_ptrlock_t *ptrlock) { if ((uintptr_t) *ptrlock > 2) return *ptrlock; if (__sync_bool_compare_and_swap (ptrlock, NULL, (uintptr_t) 1)) return NULL; return gomp_ptrlock_get_slow (ptrlock); } extern void gomp_ptrlock_set_slow (gomp_ptrlock_t *ptrlock, void *ptr); static inline void gomp_ptrlock_set (gomp_ptrlock_t *ptrlock, void *ptr) { if (!__sync_bool_compare_and_swap (ptrlock, (uintptr_t) 1, ptr)) gomp_ptrlock_set_slow (ptrlock, ptr); } static inline void gomp_ptrlock_destroy (gomp_ptrlock_t *ptrlock) { } #endif /* GOMP_PTRLOCK_H */
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