bsd/sys/semaphore.h

   1 /*
   2  * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*      @(#)semaphore.h 1.0     2/29/00         */
  29
  30
  31
  32 /*
  33  * semaphore.h - POSIX semaphores
  34  *
  35  * HISTORY
  36  * 29-Feb-00    A.Ramesh at Apple
  37  *      Created for Mac OS X
  38  */
  39
  40 #ifndef _SYS_SEMAPHORE_H_
  41 #define _SYS_SEMAPHORE_H_
  42
  43 typedef int sem_t;
  44
  45 /* this should go in limits.h> */
  46 #define SEM_VALUE_MAX 32767
  47 #define SEM_FAILED ((sem_t *)-1)
  48
  49 #ifndef KERNEL
  50 #include <sys/cdefs.h>
  51
  52 __BEGIN_DECLS
  53 int sem_close(sem_t *);
  54 int sem_destroy(sem_t *);
  55 int sem_getvalue(sem_t * __restrict, int * __restrict);
  56 int sem_init(sem_t *, int, unsigned int);
  57 sem_t * sem_open(const char *, int, ...);
  58 int sem_post(sem_t *);
  59 int sem_trywait(sem_t *);
  60 int sem_unlink(const char *);
  61 int sem_wait(sem_t *) __DARWIN_ALIAS_C(sem_wait);
  62 __END_DECLS
  63
  64 #else   /* KERNEL */
  65 void psem_lock_init(void);
  66 void psem_cache_init(void);
  67 #endif  /* KERNEL */
  68
  69 #endif  /* _SYS_SEMAPHORE_H_ */