semaphore.h revision 331722 
1/*
2 * Copyright (c) 2010 David Xu <davidxu@freebsd.org>
3 *
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice unmodified, this list of conditions, and the following
11 *    disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * $FreeBSD: stable/11/include/semaphore.h 331722 2018-03-29 02:50:57Z eadler $
28 */
29
30/* semaphore.h: POSIX 1003.1b semaphores */
31
32#ifndef _SEMAPHORE_H_
33#define _SEMAPHORE_H_
34
35#include <sys/cdefs.h>
36#include <sys/_types.h>
37#include <sys/_umtx.h>
38
39#include <machine/_limits.h>
40
41struct _sem {
42	__uint32_t	_magic;
43	struct _usem2	_kern;
44	__uint32_t	_padding;	/* Preserve structure size */
45};
46
47typedef	struct _sem	sem_t;
48
49#define	SEM_FAILED	((sem_t *)0)
50#define	SEM_VALUE_MAX	__INT_MAX
51
52struct timespec;
53
54__BEGIN_DECLS
55#if __BSD_VISIBLE
56int	 sem_clockwait_np(sem_t * __restrict, __clockid_t, int,
57	    const struct timespec *, struct timespec *);
58#endif
59int	 sem_close(sem_t *);
60int	 sem_destroy(sem_t *);
61int	 sem_getvalue(sem_t * __restrict, int * __restrict);
62int	 sem_init(sem_t *, int, unsigned int);
63sem_t	*sem_open(const char *, int, ...);
64int	 sem_post(sem_t *);
65int	 sem_timedwait(sem_t * __restrict, const struct timespec * __restrict);
66int	 sem_trywait(sem_t *);
67int	 sem_unlink(const char *);
68int	 sem_wait(sem_t *);
69__END_DECLS
70
71#endif /* !_SEMAPHORE_H_ */
72