| Dan Albert | 287553d | 2017-02-16 10:47:51 -0800 | [diff] [blame] | 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 | |
| 35 | typedef struct { |
| 36 | volatile unsigned int count; |
| 37 | } sem_t; |
| 38 | |
| 39 | #define SEM_FAILED NULL |
| 40 | |
| 41 | extern int sem_init(sem_t *sem, int pshared, unsigned int value); |
| 42 | |
| 43 | extern int sem_close(sem_t *); |
| 44 | extern int sem_destroy(sem_t *); |
| 45 | extern int sem_getvalue(sem_t *, int *); |
| 46 | extern int sem_init(sem_t *, int, unsigned int); |
| 47 | extern sem_t *sem_open(const char *, int, ...); |
| 48 | extern int sem_post(sem_t *); |
| 49 | extern int sem_trywait(sem_t *); |
| 50 | extern int sem_unlink(const char *); |
| 51 | extern int sem_wait(sem_t *); |
| 52 | |
| 53 | struct timespec; |
| 54 | extern int sem_timedwait(sem_t *sem, const struct timespec *abs_timeout); |
| 55 | |
| 56 | __END_DECLS |
| 57 | |
| 58 | #endif /* _SEMAPHORE_H */ |