1 /* Copyright (C) 2005, 2006 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 Lesser General Public License as published by 8 the Free Software Foundation; either version 2.1 of the License, or 9 (at your option) 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 Lesser General Public License for 14 more details. 15 16 You should have received a copy of the GNU Lesser General Public License 17 along with libgomp; see the file COPYING.LIB. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21 /* As a special exception, if you link this library with other files, some 22 of which are compiled with GCC, to produce an executable, this library 23 does not by itself cause the resulting executable to be covered by the 24 GNU General Public License. This exception does not however invalidate 25 any other reasons why the executable file might be covered by the GNU 26 General Public License. */ 27 28 /* This is the default POSIX 1003.1b implementation of a semaphore 29 synchronization mechanism for libgomp. This type is private to 30 the library. 31 32 This is a bit heavy weight for what we need, in that we're not 33 interested in sem_wait as a cancelation point, but it's not too 34 bad for a default. */ 35 36 #ifndef GOMP_SEM_H 37 #define GOMP_SEM_H 1 38 39 #ifdef HAVE_ATTRIBUTE_VISIBILITY 40 # pragma GCC visibility push(default) 41 #endif 42 43 #include <semaphore.h> 44 45 #ifdef HAVE_ATTRIBUTE_VISIBILITY 46 # pragma GCC visibility pop 47 #endif 48 49 #ifdef HAVE_BROKEN_POSIX_SEMAPHORES 50 #include <pthread.h> 51 52 struct gomp_sem 53 { 54 pthread_mutex_t mutex; 55 pthread_cond_t cond; 56 int value; 57 }; 58 59 typedef struct gomp_sem gomp_sem_t; 60 61 extern void gomp_sem_init (gomp_sem_t *sem, int value); 62 63 extern void gomp_sem_wait (gomp_sem_t *sem); 64 65 extern void gomp_sem_post (gomp_sem_t *sem); 66 67 extern void gomp_sem_destroy (gomp_sem_t *sem); 68 69 #else /* HAVE_BROKEN_POSIX_SEMAPHORES */ 70 71 typedef sem_t gomp_sem_t; 72 73 static inline void gomp_sem_init (gomp_sem_t *sem, int value) 74 { 75 sem_init (sem, 0, value); 76 } 77 78 extern void gomp_sem_wait (gomp_sem_t *sem); 79 80 static inline void gomp_sem_post (gomp_sem_t *sem) 81 { 82 sem_post (sem); 83 } 84 85 static inline void gomp_sem_destroy (gomp_sem_t *sem) 86 { 87 sem_destroy (sem); 88 } 89 #endif /* doesn't HAVE_BROKEN_POSIX_SEMAPHORES */ 90 #endif /* GOMP_SEM_H */ 91