Working with QThread

Prompt how to implement the following features:

My application is a lot Thread server and receives the job to copy files from one directory to another. After receives a job is entered into the database and get in the queue.With the help of a timer, I queried the database every 10 seconds, and derive from the base of your new job. Each new task of copying a file is executed in a separate thread.Now you need to be able to suspend the execution in advance of copying the file / interrupt the flow.
Prompt how to make sure that I at any time to stop the flow.

application of this:

Code:

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void Server::TimerShot()
{
	CWorkThread *WThread = new CWorkThread(this);
	connect(WThread, SIGNAL(finished()), WThread, SLOT(deleteLater()));
	WThread->start(QThread::HighPriority);
}

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Code:

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void CWorkThread::run()
{	
	CWorkFiles files;
 
	sInfo = db.GetNewTask();
	db.CloseDB();
 
       //File Operation blocked. While the file is not copied more than walk.
       if(files.CopyFileExPrg(QDir::toNativeSeparators(sInfo.cFileName),
          QDir::toNativeSeparators(sGInfo.cDstPath), true, false, sInfo.nSysId))
					{
                    //OK
					db.ChangeState(3, sInfo.cObjName, sInfo.cFileName, sInfo.nSysId);
					db.CloseDB();
					break;
					}
				else
					{
                    //ERROR
					db.ChangeState(33, sInfo.cObjName, sInfo.cFileName, sInfo.nSysId);
					db.CloseDB();
					break;
					}
}

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I suggest you read about QThreadPool and QRunnable and QFuture.