1/* Copyright (C) 2005-2020 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
50struct gomp_sem
51{
52  pthread_mutex_t	mutex;
53  pthread_cond_t	cond;
54  int			value;
55};
56
57typedef struct gomp_sem gomp_sem_t;
58
59extern void gomp_sem_init (gomp_sem_t *sem, int value);
60
61extern void gomp_sem_wait (gomp_sem_t *sem);
62
63extern void gomp_sem_post (gomp_sem_t *sem);
64
65extern void gomp_sem_destroy (gomp_sem_t *sem);
66
67#else /* HAVE_BROKEN_POSIX_SEMAPHORES  */
68
69typedef sem_t gomp_sem_t;
70
71static inline void gomp_sem_init (gomp_sem_t *sem, int value)
72{
73  sem_init (sem, 0, value);
74}
75
76extern void gomp_sem_wait (gomp_sem_t *sem);
77
78static inline void gomp_sem_post (gomp_sem_t *sem)
79{
80  sem_post (sem);
81}
82
83static 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