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semaphore.h revision 1.1 
      1 /* $NetBSD: semaphore.h,v 1.1 2003/01/20 20:09:50 christos 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 #ifndef _SEMAPHORE_H_
     39 #define _SEMAPHORE_H_
     40 
     41 /* POSIX 1003.1b semaphores */
     42 
     43 struct _sem_st;
     44 typedef	struct _sem_st *sem_t;
     45 
     46 #define	SEM_FAILED	((sem_t *)0)
     47 #define	SEM_VALUE_MAX	(~0U)
     48 
     49 __BEGIN_DECLS
     50 int	 sem_close(sem_t *);
     51 int	 sem_destroy(sem_t *);
     52 int	 sem_getvalue(sem_t * __restrict, int * __restrict);
     53 int	 sem_init(sem_t *, int, unsigned int);
     54 int	 sem_post(sem_t *);
     55 int	 sem_trywait(sem_t *);
     56 int	 sem_unlink(const char *);
     57 int	 sem_wait(sem_t *);
     58 sem_t	*sem_open(const char *, int, ...);
     59 __END_DECLS
     60 
     61 #endif /* !_SEMAPHORE_H_ */
     62