_semaphore.h revision 139825
1/*-
2 * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *	$FreeBSD: head/sys/sys/_semaphore.h 139825 2005-01-07 02:29:27Z imp $
27 */
28#ifndef __SEMAPHORE_H_
29#define __SEMAPHORE_H_
30
31typedef intptr_t semid_t;
32struct timespec;
33
34#ifndef _KERNEL
35
36#include <sys/cdefs.h>
37
38/*
39 * Semaphore definitions.
40 */
41struct sem {
42#define SEM_MAGIC       ((u_int32_t) 0x09fa4012)
43        u_int32_t       magic;
44        pthread_mutex_t lock;
45        pthread_cond_t  gtzero;
46        u_int32_t       count;
47        u_int32_t       nwaiters;
48#define SEM_USER        (NULL)
49        semid_t         semid;  /* semaphore id if kernel (shared) semaphore */
50        int             syssem; /* 1 if kernel (shared) semaphore */
51        LIST_ENTRY(sem) entry;
52        struct sem      **backpointer;
53};
54
55__BEGIN_DECLS
56
57int ksem_close(semid_t id);
58int ksem_post(semid_t id);
59int ksem_wait(semid_t id);
60int ksem_trywait(semid_t id);
61int ksem_timedwait(semid_t id, struct timespec *abstime);
62int ksem_init(semid_t *idp, unsigned int value);
63int ksem_open(semid_t *idp, const char *name, int oflag, mode_t mode,
64    unsigned int value);
65int ksem_unlink(const char *name);
66int ksem_getvalue(semid_t id, int *val);
67int ksem_destroy(semid_t id);
68
69__END_DECLS
70
71#endif /* !_KERNEL */
72
73#endif /* __SEMAPHORE_H_ */
74