/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
//
//  objc_sync.h
//
//  Copyright (c) 2002 Apple Computer, Inc. All rights reserved.
//

#ifndef __OBJC_SNYC_H_
#define __OBJC_SNYC_H_

#include <objc/objc.h>

// Begin synchronizing on 'obj'.  
// Allocates recursive pthread_mutex associated with 'obj' if needed.
// Returns OBJC_SYNC_SUCCESS once lock is acquired.  
OBJC_EXPORT  int objc_sync_enter(id obj);

// End synchronizing on 'obj'. 
// Returns OBJC_SYNC_SUCCESS or OBJC_SYNC_NOT_OWNING_THREAD_ERROR
OBJC_EXPORT  int objc_sync_exit(id obj);

// Temporarily release lock on 'obj' and wait for another thread to notify on 'obj'
// Return OBJC_SYNC_SUCCESS, OBJC_SYNC_NOT_OWNING_THREAD_ERROR, OBJC_SYNC_TIMED_OUT
OBJC_EXPORT  int objc_sync_wait(id obj, long long milliSecondsMaxWait);

// Wake up another thread waiting on 'obj'
// Return OBJC_SYNC_SUCCESS, OBJC_SYNC_NOT_OWNING_THREAD_ERROR
OBJC_EXPORT  int objc_sync_notify(id obj);

// Wake up all threads waiting on 'obj'
// Return OBJC_SYNC_SUCCESS, OBJC_SYNC_NOT_OWNING_THREAD_ERROR
OBJC_EXPORT  int objc_sync_notifyAll(id obj);

enum {
	OBJC_SYNC_SUCCESS                 = 0,
	OBJC_SYNC_NOT_OWNING_THREAD_ERROR = -1,
	OBJC_SYNC_TIMED_OUT               = -2,
	OBJC_SYNC_NOT_INITIALIZED         = -3		
};


#endif // __OBJC_SNYC_H_