include/semaphore.h

   1 /*-
   2  * Copyright (c) 1996, 1997
   3  *      HD Associates, Inc.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by HD Associates, Inc
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/sys/posix4/semaphore.h,v 1.6 2000/01/20 07:55:42 jasone Exp $
  33  */
  34
  35 #ifndef _SEMAPHORE_H_
  36 #define _SEMAPHORE_H_
  37
  38 /* semaphore.h: POSIX 1003.1b semaphores */
  39
  40 #include <sys/cdefs.h>
  41 #include <sys/_timespec.h>
  42 #include <machine/limits.h>
  43
  44 /* Opaque type definition. */
  45 struct sem;
  46 typedef struct sem *sem_t;
  47
  48 #define SEM_FAILED      ((sem_t *)0)
  49 #define SEM_VALUE_MAX   INT_MAX
  50
  51 __BEGIN_DECLS
  52 int      sem_init(sem_t *, int, unsigned int);
  53 int      sem_destroy(sem_t *);
  54 sem_t   *sem_open(const char *, int, ...);
  55 int      sem_close(sem_t *);
  56 int      sem_unlink(const char *);
  57 int      sem_wait(sem_t *);
  58 int      sem_trywait(sem_t *);
  59 int      sem_timedwait(sem_t * __restrict, const struct timespec * __restrict);
  60 int      sem_post(sem_t *);
  61 int      sem_getvalue(sem_t * __restrict, int * __restrict);
  62 __END_DECLS
  63
  64 #endif /* !_SEMAPHORE_H_ */