1 /* $NetBSD: semaphore.h,v 1.4 2012/03/08 21:59:28 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _SEMAPHORE_H_ 33 #define _SEMAPHORE_H_ 34 35 /* POSIX 1003.1b semaphores */ 36 37 struct _sem_st; 38 typedef struct _sem_st *sem_t; 39 40 #define SEM_FAILED ((sem_t *)0) 41 #define SEM_VALUE_MAX (~0U) 42 43 #include <sys/time.h> 44 45 __BEGIN_DECLS 46 int sem_close(sem_t *); 47 int sem_destroy(sem_t *); 48 int sem_getvalue(sem_t * __restrict, int * __restrict); 49 int sem_init(sem_t *, int, unsigned int); 50 int sem_post(sem_t *); 51 int sem_timedwait(sem_t *, const struct timespec * __restrict); 52 int sem_trywait(sem_t *); 53 int sem_unlink(const char *); 54 int sem_wait(sem_t *); 55 sem_t *sem_open(const char *, int, ...); 56 __END_DECLS 57 58 #endif /* !_SEMAPHORE_H_ */ 59