bsd/sys/semaphore.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*      @(#)semaphore.h 1.0     2/29/00         */
  24
  25
  26
  27 /*
  28  * semaphore.h - POSIX semaphores
  29  *
  30  * HISTORY
  31  * 29-Feb-00    A.Ramesh at Apple
  32  *      Created for Mac OS X
  33  */
  34
  35 #ifndef _SYS_SEMAPHORE_H_
  36 #define _SYS_SEMAPHORE_H_
  37
  38 typedef int sem_t;
  39 /* this should go in limits.h> */
  40 #define SEM_VALUE_MAX 32767
  41 #define SEM_FAILED -1
  42
  43 #ifndef KERNEL
  44 #include <sys/cdefs.h>
  45
  46 __BEGIN_DECLS
  47 int sem_close(sem_t *);
  48 int sem_destroy(sem_t *);
  49 int sem_getvalue(sem_t *, int *);
  50 int sem_init(sem_t *, int, unsigned int);
  51 sem_t * sem_open(const char *, int, ...);
  52 int sem_post(sem_t *);
  53 int sem_trywait(sem_t *);
  54 int sem_unlink(const char *);
  55 int sem_wait(sem_t *);
  56 __END_DECLS
  57
  58 #else   /* KERNEL */
  59 void psem_cache_init(void);
  60 #endif  /* KERNEL */
  61
  62 #endif  /* _SYS_SEMAPHORE_H_ */