1 /* $OpenBSD: semaphore.h,v 1.1 2017/10/15 23:40:33 guenther Exp $ */ 2 3 /* semaphore.h: POSIX 1003.1b semaphores */ 4 5 /*- 6 * Copyright (c) 1996, 1997 7 * HD Associates, Inc. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by HD Associates, Inc 20 * 4. Neither the name of the author nor the names of any co-contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef _SEMAPHORE_H_ 38 #define _SEMAPHORE_H_ 39 40 #include <sys/cdefs.h> 41 42 /* Opaque type definition. */ 43 struct __sem; 44 typedef struct __sem *sem_t; 45 struct timespec; 46 47 #define SEM_FAILED ((sem_t *)0) 48 49 __BEGIN_DECLS 50 int sem_init(sem_t *, int, unsigned int); 51 int sem_destroy(sem_t *); 52 sem_t *sem_open(const char *, int, ...); 53 int sem_close(sem_t *); 54 int sem_unlink(const char *); 55 int sem_wait(sem_t *); 56 int sem_timedwait(sem_t * __restrict, const struct timespec * __restrict); 57 int sem_trywait(sem_t *); 58 int sem_post(sem_t *); 59 int sem_getvalue(sem_t * __restrict, int * __restrict); 60 __END_DECLS 61 62 #endif /* _SEMAPHORE_H_ */ 63