bsd/sys/semaphore.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*      @(#)semaphore.h 1.0     2/29/00         */
  31
  32
  33
  34 /*
  35  * semaphore.h - POSIX semaphores
  36  *
  37  * HISTORY
  38  * 29-Feb-00    A.Ramesh at Apple
  39  *      Created for Mac OS X
  40  */
  41
  42 #ifndef _SYS_SEMAPHORE_H_
  43 #define _SYS_SEMAPHORE_H_
  44
  45 typedef int sem_t;
  46 /* this should go in limits.h> */
  47 #define SEM_VALUE_MAX 32767
  48 #define SEM_FAILED -1
  49
  50 #ifndef KERNEL
  51 #include <sys/cdefs.h>
  52
  53 __BEGIN_DECLS
  54 int sem_close(sem_t *);
  55 int sem_destroy(sem_t *);
  56 int sem_getvalue(sem_t *, int *);
  57 int sem_init(sem_t *, int, unsigned int);
  58 sem_t * sem_open(const char *, int, ...);
  59 int sem_post(sem_t *);
  60 int sem_trywait(sem_t *);
  61 int sem_unlink(const char *);
  62 int sem_wait(sem_t *);
  63 __END_DECLS
  64
  65 #else   /* KERNEL */
  66 void psem_cache_init(void);
  67 #endif  /* KERNEL */
  68
  69 #endif  /* _SYS_SEMAPHORE_H_ */