//
//  "$Id$"
//
//  Copyright (c)1992-2011, ZheJiang Dahua Technology Stock CO.LTD.
//  All Rights Reserved.
//
//	Description:
//	Revisions:		Year-Month-Day  SVN-Author  Modification
//

#ifndef __INFRA3_RW_MUTEX_H__
#define __INFRA3_RW_MUTEX_H__

#include "Defs.h"


namespace Dahua{
namespace Infra{

struct RWMutexInternal;

/// \class CMutex
/// \brief 多平台互斥量类
class INFRA_API CReadWriteMutex
{
	CReadWriteMutex(CReadWriteMutex const&);
	CReadWriteMutex& operator=(CReadWriteMutex const&);

/// 设置读写锁优先级枚举类型RWPriority
/// \param priorityDefault 设置默认优先级，linux下读锁优先，WIN32下保持原先状态暂未实现。
/// \param priorityWrite 设置写锁优先级，linux下写锁优先，WIN32下保持原先状态暂未实现。
public:
	enum RWPriority	
	{
		priorityDefault = 0,
		priorityWrite = 1,
	};

public:
	/// 构造函数，会创建系统互斥量
	CReadWriteMutex();

	/// 构造函数，会创建系统互斥量，并传入读写锁优先级设置参数
	/// \ param rwpriority 读写锁优先级参数，枚举类型
	CReadWriteMutex(RWPriority rwpriority);	
	
	/// 析构函数，会销毁系统互斥量
	~CReadWriteMutex();

	/// 进入临界区。
	/// \return 操作是否成功
	bool enterReading();

	/// 进入临界区。
	/// \return 操作是否成功
	bool enterWriting();

	/// 离开临界区。
	/// \return 操作是否成功
	bool leave();

private:
	RWMutexInternal* m_internal;
};

} // namespace Infra
} // namespace Dahua

#endif //__INFRA_RW_MUTEX_H__

//
// End of "$Id: Mutex.h 16503 2010-11-26 02:23:15Z wang_haifeng $"
//