Source to osfmk/kern/sync_sema.h


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/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @[email protected]
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @[email protected]
 */
/*
 * @[email protected]
 * 
 */
/*
 *	File:	kern/sync_sema.h
 *	Author:	Joseph CaraDonna
 *
 *	Contains RT distributed semaphore synchronization service definitions.
 */

#ifndef _KERN_SYNC_SEMA_H_
#define _KERN_SYNC_SEMA_H_

#include <kern/kern_types.h>

#ifdef MACH_KERNEL_PRIVATE

#include <kern/queue.h>
#include <kern/lock.h>
#include <kern/wait_queue.h>

typedef struct semaphore {
	queue_chain_t	  task_link;  /* chain of semaphores owned by a task */
	struct wait_queue wait_queue; /* queue of blocked threads & lock     */
	task_t		  owner;      /* task that owns semaphore            */
	ipc_port_t	  port;	      /* semaphore port	 		     */
	int		  ref_count;  /* reference count		     */
	int		  count;      /* current count value	             */
	boolean_t	  active;     /* active status			     */
} Semaphore;


#endif /* MACH_KERNEL_PRIVATE */

/*
 *	Forward Declarations
 */
extern	kern_return_t	semaphore_create	(task_t task,
						 semaphore_t *new_semaphore,
						 int policy,
						 int value);

extern	kern_return_t	semaphore_destroy	(task_t task,
						 semaphore_t semaphore);

extern	void		semaphore_reference	(semaphore_t semaphore);
extern	void		semaphore_dereference	(semaphore_t semaphore);

extern	kern_return_t	semaphore_signal     	(semaphore_t semaphore);
extern	kern_return_t	semaphore_signal_all 	(semaphore_t semaphore);
extern	kern_return_t	semaphore_signal_thread	(semaphore_t semaphore,
						 thread_act_t thread_act);
extern	kern_return_t	semaphore_wait       	(semaphore_t semaphore);
extern	kern_return_t	semaphore_timedwait    	(semaphore_t semaphore, 
						 mach_timespec_t wait_time);

#endif /* _KERN_SYNC_SEMA_H_ */