1/*
2 * Copyright (C) 2008 The Android Open Source Project
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 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28#ifndef _SEMAPHORE_H
29#define _SEMAPHORE_H
30
31#include <sys/cdefs.h>
32
33__BEGIN_DECLS
34
35typedef struct {
36    volatile unsigned int  count;
37} sem_t;
38
39#define  SEM_FAILED  NULL
40
41extern int sem_init(sem_t *sem, int pshared, unsigned int value);
42
43extern int    sem_close(sem_t *);
44extern int    sem_destroy(sem_t *);
45extern int    sem_getvalue(sem_t *, int *);
46extern int    sem_init(sem_t *, int, unsigned int);
47extern sem_t *sem_open(const char *, int, ...);
48extern int    sem_post(sem_t *);
49extern int    sem_trywait(sem_t *);
50extern int    sem_unlink(const char *);
51extern int    sem_wait(sem_t *);
52
53struct timespec;
54extern int    sem_timedwait(sem_t *sem, const struct timespec *abs_timeout);
55
56__END_DECLS
57
58#endif /* _SEMAPHORE_H */
59