filelock.h

一套linux下的C++开发库

/***************************************************************************
                          filelock.h  -  description
                             -------------------
    begin                : Fri Jul 20 2001
    copyright            : (C) 2001 by Mark
    email                : [e-mail]
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/


#ifndef FILELOCK_H
#define FILELOCK_H

#include <unistd.h>
#include <fcntl.h>

#include "tinycxx/exception.h"


class CFileLock
{
protected:
	int m_iFd;
	
protected:
	//return false when interupt by singal
	bool Fcntl(int iCmd, int iType, int iOffset, int iLen, int iWhence);
	
public:
	CFileLock(const char* sPath);
	virtual ~CFileLock();
	
	//return false when interupt by singal	
	inline bool ReadLock(int iOffset, int iLen = 1, int iWhence = SEEK_SET)
			{ return Fcntl(F_SETLK, F_RDLCK, iOffset, iLen, iWhence); }
	inline bool WriteLock(int iOffset, int iLen = 1, int iWhence = SEEK_SET)
			{ return Fcntl(F_SETLK, F_WRLCK, iOffset, iLen, iWhence); }	
	inline bool ReadLockW(int iOffset, int iLen = 1, int iWhence = SEEK_SET)
			{ return Fcntl(F_SETLKW, F_RDLCK, iOffset, iLen, iWhence); }	
	inline bool WriteLockW(int iOffset, int iLen = 1, int iWhence = SEEK_SET)
			{ return Fcntl(F_SETLKW, F_WRLCK, iOffset, iLen, iWhence); }
	inline bool Unlock(int iOffset, int iLen = 1, int iWhence = SEEK_SET)
			{ return Fcntl(F_SETLK, F_UNLCK, iOffset, iLen, iWhence); }
};

#endif