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