1 /* Copyright (C) 2005-2018 Free Software Foundation, Inc. 2 Contributed by Richard Henderson <rth@redhat.com>. 3 4 This file is part of the GNU Offloading and Multi Processing Library 5 (libgomp). 6 7 Libgomp is free software; you can redistribute it and/or modify it 8 under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 14 FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 /* This is the default POSIX 1003.1b implementation of a semaphore 27 synchronization mechanism for libgomp. This type is private to 28 the library. 29 30 This is a bit heavy weight for what we need, in that we're not 31 interested in sem_wait as a cancelation point, but it's not too 32 bad for a default. */ 33 34 #ifndef GOMP_SEM_H 35 #define GOMP_SEM_H 1 36 37 #ifdef HAVE_ATTRIBUTE_VISIBILITY 38 # pragma GCC visibility push(default) 39 #endif 40 41 #include <semaphore.h> 42 43 #ifdef HAVE_ATTRIBUTE_VISIBILITY 44 # pragma GCC visibility pop 45 #endif 46 47 #ifdef HAVE_BROKEN_POSIX_SEMAPHORES 48 #include <pthread.h> 49 50 struct gomp_sem 51 { 52 pthread_mutex_t mutex; 53 pthread_cond_t cond; 54 int value; 55 }; 56 57 typedef struct gomp_sem gomp_sem_t; 58 59 extern void gomp_sem_init (gomp_sem_t *sem, int value); 60 61 extern void gomp_sem_wait (gomp_sem_t *sem); 62 63 extern void gomp_sem_post (gomp_sem_t *sem); 64 65 extern void gomp_sem_destroy (gomp_sem_t *sem); 66 67 #else /* HAVE_BROKEN_POSIX_SEMAPHORES */ 68 69 typedef sem_t gomp_sem_t; 70 71 static inline void gomp_sem_init (gomp_sem_t *sem, int value) 72 { 73 sem_init (sem, 0, value); 74 } 75 76 extern void gomp_sem_wait (gomp_sem_t *sem); 77 78 static inline void gomp_sem_post (gomp_sem_t *sem) 79 { 80 sem_post (sem); 81 } 82 83 static inline void gomp_sem_destroy (gomp_sem_t *sem) 84 { 85 sem_destroy (sem); 86 } 87 #endif /* doesn't HAVE_BROKEN_POSIX_SEMAPHORES */ 88 #endif /* GOMP_SEM_H */ 89