include/semaphore.h

   1 /* $NetBSD: semaphore.h,v 1.3 2008/04/28 20:22:54 martin 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/cdefs.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_trywait(sem_t *);
  52 int      sem_unlink(const char *);
  53 int      sem_wait(sem_t *);
  54 sem_t   *sem_open(const char *, int, ...);
  55 __END_DECLS
  56
  57 #endif /* !_SEMAPHORE_H_ */