1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2010 David Xu <davidxu@freebsd.org>
5 *
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice unmodified, this list of conditions, and the following
13 *    disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32/* semaphore.h: POSIX 1003.1b semaphores */
33
34#ifndef _SEMAPHORE_H_
35#define _SEMAPHORE_H_
36
37#include <sys/cdefs.h>
38#include <sys/_types.h>
39#include <sys/_umtx.h>
40
41#include <machine/_limits.h>
42
43struct _sem {
44	__uint32_t	_magic;
45	struct _usem2	_kern;
46	__uint32_t	_padding;	/* Preserve structure size */
47};
48
49typedef	struct _sem	sem_t;
50
51#define	SEM_FAILED	((sem_t *)0)
52#define	SEM_VALUE_MAX	__INT_MAX
53
54struct timespec;
55
56__BEGIN_DECLS
57#if __BSD_VISIBLE
58int	 sem_clockwait_np(sem_t * __restrict, __clockid_t, int,
59	    const struct timespec *, struct timespec *);
60#endif
61int	 sem_close(sem_t *);
62int	 sem_destroy(sem_t *);
63int	 sem_getvalue(sem_t * __restrict, int * __restrict);
64int	 sem_init(sem_t *, int, unsigned int);
65sem_t	*sem_open(const char *, int, ...);
66int	 sem_post(sem_t *);
67int	 sem_timedwait(sem_t * __restrict, const struct timespec * __restrict);
68int	 sem_trywait(sem_t *);
69int	 sem_unlink(const char *);
70int	 sem_wait(sem_t *);
71__END_DECLS
72
73#endif /* !_SEMAPHORE_H_ */
74