/* Copyright (C) 2005 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with libgomp; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* As a special exception, if you link this library with other files, some of which are compiled with GCC, to produce an executable, this library does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License. */ /* This is a Linux specific implementation of a semaphore synchronization mechanism for libgomp. This type is private to the library. This implementation uses atomic instructions and the futex syscall. */ #ifndef GOMP_SEM_H #define GOMP_SEM_H 1 typedef int gomp_sem_t; static inline void gomp_sem_init (gomp_sem_t *sem, int value) { *sem = value; } extern void gomp_sem_wait_slow (gomp_sem_t *); static inline void gomp_sem_wait (gomp_sem_t *sem) { if (!__sync_bool_compare_and_swap (sem, 1, 0)) gomp_sem_wait_slow (sem); } extern void gomp_sem_post_slow (gomp_sem_t *); static inline void gomp_sem_post (gomp_sem_t *sem) { if (!__sync_bool_compare_and_swap (sem, 0, 1)) gomp_sem_post_slow (sem); } static inline void gomp_sem_destroy (gomp_sem_t *sem) { } #endif /* GOMP_SEM_H */