// ***************************************************************************
//
// Reality - The Matrix Online Server Emulator
// Copyright (C) 2006-2010 Rajko Stojadinovic
// http://mxoemu.info
//
// ---------------------------------------------------------------------------
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// ---------------------------------------------------------------------------
//
// ***************************************************************************

#ifndef MXOSIM_RWLOCK_H
#define MXOSIM_RWLOCK_H

#include "Condition.h"
#include "NativeMutex.h"

class RWLock
{
public: 

	inline void AcquireReadLock()
	{
		//_lock.Acquire();
		_cond.BeginSynchronized();
		_readers++;
		//_lock.Release();
		_cond.EndSynchronized();
	}

	inline void ReleaseReadLock()
	{
		//_lock.Acquire();
		_cond.BeginSynchronized();
		if(!(--_readers))
			if(_writers)
				_cond.Signal();
		//_lock.Release();
		_cond.EndSynchronized();
	}

	inline void AcquireWriteLock()
	{
		//_lock.Acquire();
		_cond.BeginSynchronized();
		_writers++;
		if(_readers)
			_cond.Wait();
	}

	inline void ReleaseWriteLock()
	{
		if(--_writers)
			_cond.Signal();
		//_lock.Release();
		_cond.EndSynchronized();
	}
	inline RWLock() : _cond(&_lock) {_readers=0;_writers=0;}

private:
	NativeMutex _lock;
	Condition _cond;
	volatile unsigned int _readers;
	volatile unsigned int _writers;
}; 

#endif