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      1 /* $NetBSD: semaphore.h,v 1.5 2016/04/24 19:48:29 dholland 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 
     42 #include <sys/semaphore.h> /* some kernel-only bits */
     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