include/semaphore.h

   1 /*
   2  * Copyright (c) 2010 David Xu <davidxu@freebsd.org>
   3  *
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice unmodified, this list of conditions, and the following
  11  *    disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  *
  27  * $FreeBSD$
  28  */
  29
  30 /* semaphore.h: POSIX 1003.1b semaphores */
  31
  32 #ifndef _SEMAPHORE_H_
  33 #define _SEMAPHORE_H_
  34
  35 #include <sys/cdefs.h>
  36 #include <sys/_types.h>
  37 #include <sys/_umtx.h>
  38
  39 #include <machine/_limits.h>
  40
  41 struct _sem {
  42         __uint32_t      _magic;
  43         struct _usem2   _kern;
  44         __uint32_t      _padding;       /* Preserve structure size */
  45 };
  46
  47 typedef struct _sem     sem_t;
  48
  49 #define SEM_FAILED      ((sem_t *)0)
  50 #define SEM_VALUE_MAX   __INT_MAX
  51
  52 struct timespec;
  53
  54 __BEGIN_DECLS
  55 int      sem_close(sem_t *);
  56 int      sem_destroy(sem_t *);
  57 int      sem_getvalue(sem_t * __restrict, int * __restrict);
  58 int      sem_init(sem_t *, int, unsigned int);
  59 sem_t   *sem_open(const char *, int, ...);
  60 int      sem_post(sem_t *);
  61 int      sem_timedwait(sem_t * __restrict, const struct timespec * __restrict);
  62 int      sem_trywait(sem_t *);
  63 int      sem_unlink(const char *);
  64 int      sem_wait(sem_t *);
  65 __END_DECLS
  66
  67 #endif /* !_SEMAPHORE_H_ */