// Copyright (C) 2003 Intel Corporation

//////////////////////////////////////////////////////////////////////////
// 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