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
52struct gomp_sem
53{
54  pthread_mutex_t	mutex;
55  pthread_cond_t	cond;
56  int			value;
57};
58
59typedef struct gomp_sem gomp_sem_t;
60
61extern void gomp_sem_init (gomp_sem_t *sem, int value);
62
63extern void gomp_sem_wait (gomp_sem_t *sem);
64
65extern void gomp_sem_post (gomp_sem_t *sem);
66
67extern void gomp_sem_destroy (gomp_sem_t *sem);
68
69#else /* HAVE_BROKEN_POSIX_SEMAPHORES  */
70
71typedef sem_t gomp_sem_t;
72
73static inline void gomp_sem_init (gomp_sem_t *sem, int value)
74{
75  sem_init (sem, 0, value);
76}
77
78extern void gomp_sem_wait (gomp_sem_t *sem);
79
80static inline void gomp_sem_post (gomp_sem_t *sem)
81{
82  sem_post (sem);
83}
84
85static 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