00001 /* $Id$ */
00002 
00003 /*
00004  *  Copyright (c) 2005-2009 Axel Andersson
00005  *  All rights reserved.
00006  *
00007  *  Redistribution and use in source and binary forms, with or without
00008  *  modification, are permitted provided that the following conditions
00009  *  are met:
00010  *  1. Redistributions of source code must retain the above copyright
00011  *     notice, this list of conditions and the following disclaimer.
00012  *  2. Redistributions in binary form must reproduce the above copyright
00013  *     notice, this list of conditions and the following disclaimer in the
00014  *     documentation and/or other materials provided with the distribution.
00015  *
00016  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00017  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00018  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00019  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
00020  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
00021  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00022  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00023  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
00024  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
00025  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00026  * POSSIBILITY OF SUCH DAMAGE.
00027  */
00028 
00029 #import <pthread.h>
00030 
00031 @protocol WIReadWriteLocking
00032 
00033 - (void)lockForReading;
00034 - (void)lockForWriting;
00035 - (void)unlock;
00036 
00037 @end
00038 
00039 
00040 @interface WIReadWriteLock : WIObject <WIReadWriteLocking> {
00041         pthread_rwlock_t                        _lock;
00042 }
00043 
00044 - (BOOL)tryLockForReading;
00045 - (BOOL)tryLockForWriting;
00046 
00047 @end