sys/sys/semaphore.h

   1 #ifndef _SEMAPHORE_H_
   2 #define _SEMAPHORE_H_
   3
   4 /* semaphore.h: POSIX 1003.1b semaphores */
   5
   6 /*-
   7  * Copyright (c) 1996, 1997
   8  *      HD Associates, Inc.  All rights reserved.
   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 HD Associates, Inc
  21  * 4. Neither the name of the author nor the names of any co-contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  * $FreeBSD: src/sys/posix4/semaphore.h,v 1.6 2000/01/20 07:55:42 jasone Exp $
  38  * $DragonFly: src/sys/sys/semaphore.h,v 1.3 2003/08/27 06:30:04 rob Exp $
  39  */
  40
  41 #include <sys/_posix.h>
  42 #include <machine/limits.h>
  43
  44 #ifdef _P1003_1B_INCLUDE_MAYBES
  45 #include <sys/types.h>
  46 #include <fcntl.h>
  47 #endif
  48
  49 /* Opaque type definition. */
  50 struct sem;
  51 typedef struct sem *sem_t;
  52
  53 #define SEM_FAILED      ((sem_t *)0)
  54 #define SEM_VALUE_MAX   UINT_MAX
  55
  56 #ifndef _KERNEL
  57 #include <sys/cdefs.h>
  58
  59 __BEGIN_DECLS
  60 int      sem_init (sem_t *, int, unsigned int);
  61 int      sem_destroy (sem_t *);
  62 sem_t   *sem_open (const char *, int, ...);
  63 int      sem_close (sem_t *);
  64 int      sem_unlink (const char *);
  65 int      sem_wait (sem_t *);
  66 int      sem_trywait (sem_t *);
  67 int      sem_post (sem_t *);
  68 int      sem_getvalue (sem_t *, int *);
  69 __END_DECLS
  70
  71 #endif
  72
  73 #endif /* _SEMAPHORE_H_ */