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/*
NSLock.h
Copyright (C) 1995, 1996 Ovidiu Predescu and Mircea Oancea.
All rights reserved.
Author: Mircea Oancea <mircea@jupiter.elcom.pub.ro>
This file is part of libFoundation.
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted, provided
that the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.
We disclaim all warranties with regard to this software, including all
implied warranties of merchantability and fitness, in no event shall
we be liable for any special, indirect or consequential damages or any
damages whatsoever resulting from loss of use, data or profits, whether in
an action of contract, negligence or other tortious action, arising out of
or in connection with the use or performance of this software.
*/
#ifndef __NSLock_h__
#define __NSLock_h__
#include <Foundation/NSObject.h>
#include <extensions/objc-runtime.h>
@class NSDate;
/* Protocol for thread/task locks */
@protocol NSLocking
- (void)lock;
- (void)unlock;
@end
/* Lock that can be locked only once (maximum depth one) */
@interface NSLock : NSObject <NSLocking>
{
objc_mutex_t mutex;
}
- (BOOL)tryLock;
- (BOOL)lockBeforeDate:(NSDate *)limit;
@end
/* Lock that can be locked multiple times by the same process */
@interface NSRecursiveLock : NSObject <NSLocking>
{
objc_mutex_t mutex;
}
- (BOOL)tryLock;
- (BOOL)lockBeforeDate:(NSDate *)limit;
@end
/* Condition lock is a lock-ed access to a condition variable */
@interface NSConditionLock : NSObject <NSLocking>
{
objc_mutex_t mutex;
objc_condition_t condition;
volatile int value;
}
- initWithCondition:(int)aCondition;
- (int)condition;
- (void)lockWhenCondition:(int)aCondition;
- (BOOL)lockBeforeDate:(NSDate *)limit;
- (BOOL)lockWhenCondition:(int)aCondition beforeDate:(NSDate *)limit;
- (BOOL)tryLock;
- (BOOL)tryLockWhenCondition:(int)aCondition;
- (void)unlockWithCondition:(int)aCondition;
@end
#endif /* __NSLock_h__ */
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