1 /* Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc. 2 Contributed by Richard Henderson <rth@redhat.com>. 3 4 This file is part of the GNU OpenMP Library (libgomp). 5 6 Libgomp is free software; you can redistribute it and/or modify it 7 under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 more details. 15 16 Under Section 7 of GPL version 3, you are granted additional 17 permissions described in the GCC Runtime Library Exception, version 18 3.1, as published by the Free Software Foundation. 19 20 You should have received a copy of the GNU General Public License and 21 a copy of the GCC Runtime Library Exception along with this program; 22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 <http://www.gnu.org/licenses/>. */ 24 25 /* This is the default POSIX 1003.1b implementation of a semaphore 26 synchronization mechanism for libgomp. This type is private to 27 the library. 28 29 This is a bit heavy weight for what we need, in that we're not 30 interested in sem_wait as a cancelation point, but it's not too 31 bad for a default. */ 32 33 #ifndef GOMP_SEM_H 34 #define GOMP_SEM_H 1 35 36 #ifdef HAVE_ATTRIBUTE_VISIBILITY 37 # pragma GCC visibility push(default) 38 #endif 39 40 #include <semaphore.h> 41 42 #ifdef HAVE_ATTRIBUTE_VISIBILITY 43 # pragma GCC visibility pop 44 #endif 45 46 #ifdef HAVE_BROKEN_POSIX_SEMAPHORES 47 #include <pthread.h> 48 49 struct gomp_sem 50 { 51 pthread_mutex_t mutex; 52 pthread_cond_t cond; 53 int value; 54 }; 55 56 typedef struct gomp_sem gomp_sem_t; 57 58 extern void gomp_sem_init (gomp_sem_t *sem, int value); 59 60 extern void gomp_sem_wait (gomp_sem_t *sem); 61 62 extern void gomp_sem_post (gomp_sem_t *sem); 63 64 extern void gomp_sem_destroy (gomp_sem_t *sem); 65 66 #else /* HAVE_BROKEN_POSIX_SEMAPHORES */ 67 68 typedef sem_t gomp_sem_t; 69 70 static inline void gomp_sem_init (gomp_sem_t *sem, int value) 71 { 72 sem_init (sem, 0, value); 73 } 74 75 extern void gomp_sem_wait (gomp_sem_t *sem); 76 77 static inline void gomp_sem_post (gomp_sem_t *sem) 78 { 79 sem_post (sem); 80 } 81 82 static inline void gomp_sem_destroy (gomp_sem_t *sem) 83 { 84 sem_destroy (sem); 85 } 86 #endif /* doesn't HAVE_BROKEN_POSIX_SEMAPHORES */ 87 #endif /* GOMP_SEM_H */ 88