source: trunk/sys/libgomp/include/gomp/sem.h @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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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
49struct gomp_sem
50{
51  pthread_mutex_t       mutex;
52  pthread_cond_t        cond;
53  int                   value;
54};
55
56typedef struct gomp_sem gomp_sem_t;
57
58extern void gomp_sem_init (gomp_sem_t *sem, int value);
59
60extern void gomp_sem_wait (gomp_sem_t *sem);
61
62extern void gomp_sem_post (gomp_sem_t *sem);
63
64extern void gomp_sem_destroy (gomp_sem_t *sem);
65
66#else /* HAVE_BROKEN_POSIX_SEMAPHORES  */
67
68typedef sem_t gomp_sem_t;
69
70static inline void gomp_sem_init (gomp_sem_t *sem, int value)
71{
72  sem_init (sem, 0, value);
73}
74
75extern void gomp_sem_wait (gomp_sem_t *sem);
76
77static inline void gomp_sem_post (gomp_sem_t *sem)
78{
79  sem_post (sem);
80}
81
82static 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  */
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