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/*******************************************************************************
* Copyright (C) 2004-2008 Intel Corp. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of Intel Corp. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL Intel Corp. OR THE CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*******************************************************************************/
//////////////////////////////////////////////////////////////////////////
// Lock.h
//
// This file contains the definition and implementation of the Lock class
// and the TryLock class
//////////////////////////////////////////////////////////////////////////
#ifndef _LAD_LOCK_H
#define _LAD_LOCK_H
#include "RWLock.h"
#ifndef NULL
#define NULL 0
#endif
class Lock
{
public:
Lock(Semaphore &sem) : _sem(&sem), _rw_lock(NULL)
{
_sem->acquire();
}
Lock(RWLock &rw_lock, RWLock::RWMode mode = RWLock::READ_ONLY) :
_sem(NULL), _rw_lock(&rw_lock)
{
_rw_lock->acquire(mode);
}
~Lock()
{
if (_sem) {
_sem->release();
}
if (_rw_lock) {
_rw_lock->release();
}
}
private:
Semaphore *_sem;
RWLock *_rw_lock;
};
class TryLock
{
public:
TryLock(Semaphore &sem, bool &is_locked) : _sem(&sem)
{
_locked = _sem->acquireTry();
is_locked = _locked;
}
~TryLock()
{
if (_locked) {
_sem->release();
}
}
private:
bool _locked;
Semaphore *_sem;
};
#endif //_LAD_LOCK_H
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