osfmk/kern/sync_sema.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 /*
  24  * @OSF_COPYRIGHT@
  25  *
  26  */
  27 /*
  28  *      File:   kern/sync_sema.h
  29  *      Author: Joseph CaraDonna
  30  *
  31  *      Contains RT distributed semaphore synchronization service definitions.
  32  */
  33
  34 #ifndef _KERN_SYNC_SEMA_H_
  35 #define _KERN_SYNC_SEMA_H_
  36
  37 #include <kern/kern_types.h>
  38 #include <mach/sync_policy.h>
  39
  40 #ifdef MACH_KERNEL_PRIVATE
  41
  42 #include <kern/queue.h>
  43 #include <kern/lock.h>
  44 #include <kern/wait_queue.h>
  45
  46 typedef struct semaphore {
  47         queue_chain_t     task_link;  /* chain of semaphores owned by a task */
  48         struct wait_queue wait_queue; /* queue of blocked threads & lock     */
  49         task_t            owner;      /* task that owns semaphore            */
  50         ipc_port_t        port;       /* semaphore port                      */
  51         int               ref_count;  /* reference count                     */
  52         int               count;      /* current count value                 */
  53         boolean_t         active;     /* active status                       */
  54 } Semaphore;
  55
  56 #define semaphore_lock(semaphore)   wait_queue_lock(&(semaphore)->wait_queue)
  57 #define semaphore_unlock(semaphore) wait_queue_unlock(&(semaphore)->wait_queue)
  58
  59 extern void semaphore_init(void);
  60
  61 extern  void            semaphore_reference     (semaphore_t semaphore);
  62 extern  void            semaphore_dereference   (semaphore_t semaphore);
  63
  64 #endif /* MACH_KERNEL_PRIVATE */
  65
  66 #endif /* _KERN_SYNC_SEMA_H_ */