osfmk/kern/sync_sema.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  *
  28  */
  29 /*
  30  *      File:   kern/sync_sema.h
  31  *      Author: Joseph CaraDonna
  32  *
  33  *      Contains RT distributed semaphore synchronization service definitions.
  34  */
  35
  36 #ifndef _KERN_SYNC_SEMA_H_
  37 #define _KERN_SYNC_SEMA_H_
  38
  39 #include <kern/kern_types.h>
  40 #include <mach/sync_policy.h>
  41
  42 #ifdef MACH_KERNEL_PRIVATE
  43
  44 #include <kern/queue.h>
  45 #include <kern/lock.h>
  46 #include <kern/wait_queue.h>
  47
  48 typedef struct semaphore {
  49         queue_chain_t     task_link;  /* chain of semaphores owned by a task */
  50         struct wait_queue wait_queue; /* queue of blocked threads & lock     */
  51         task_t            owner;      /* task that owns semaphore            */
  52         ipc_port_t        port;       /* semaphore port                      */
  53         int               ref_count;  /* reference count                     */
  54         int               count;      /* current count value                 */
  55         boolean_t         active;     /* active status                       */
  56 } Semaphore;
  57
  58 #define semaphore_lock(semaphore)   wait_queue_lock(&(semaphore)->wait_queue)
  59 #define semaphore_unlock(semaphore) wait_queue_unlock(&(semaphore)->wait_queue)
  60
  61 extern void semaphore_init(void);
  62
  63 extern  void            semaphore_reference     (semaphore_t semaphore);
  64 extern  void            semaphore_dereference   (semaphore_t semaphore);
  65
  66 #endif /* MACH_KERNEL_PRIVATE */
  67
  68 #endif /* _KERN_SYNC_SEMA_H_ */