C++ (Qt)
#ifndef AUTOTHREADOBJ_H
#define AUTOTHREADOBJ_H
 
#include <QObject>
 
class QWaitCondition;
class QMutex;
 
class AutoThreadObj : public QObject
{
	Q_OBJECT
 
public:
	AutoThreadObj(QObject *parent = 0);
	~AutoThreadObj();	
	void resume();
	void stop();
 
public slots:
	void process();
 
private:
	QWaitCondition *m_condition;
	QMutex *m_mutex;
	volatile bool m_stop;
 
signals:
	void finished();	
};
#endif // AUTOTHREADOBJ_H
 
#include "AutoThreadObj.h"
 
#include <QWaitCondition>
#include <QMutex>
 
#include <QDebug>
 
AutoThreadObj::AutoThreadObj(QObject *parent)
	: QObject(parent)
	, m_condition(new QWaitCondition)
	, m_mutex(new QMutex)
	, m_stop(false)
{
 
}
 
AutoThreadObj::~AutoThreadObj()
{
 
}
 
void AutoThreadObj::process()
{
	forever {
		m_mutex->lock();		
		m_condition->wait(m_mutex); //wait for resume
		if (m_stop) {			
			m_mutex->unlock();
			break;
		}		
		//do something
		m_mutex->unlock();	
	}
 
	delete m_condition;
	delete m_mutex;
	emit finished();
}
 
void AutoThreadObj::resume()
{
	m_mutex->lock();
	m_condition->wakeOne();
	m_mutex->unlock();
}
 
void AutoThreadObj::stop()
{
	m_mutex->lock();
	m_stop = true;
	m_condition->wakeOne();
	m_mutex->unlock();
}
 

C++ (Qt)
#ifndef QTMPWND_H
#define QTMPWND_H
 
#include <QtGui/QMainWindow>
#include "ui_qtmpwnd.h"
 
class QThread;
class AutoThreadObj;
class QCloseEvent;
 
class QTmpWnd : public QMainWindow
{
	Q_OBJECT
 
public:
	QTmpWnd(QWidget *parent = 0, Qt::WFlags flags = 0);
	~QTmpWnd();
 
private:
	Ui::QTmpWndClass ui;
 
	QThread *m_autoThread;
	AutoThreadObj *m_autoObj;
 
protected:
	void closeEvent(QCloseEvent *e);
};
 
#endif // QTMPWND_H
 
#include "qtmpwnd.h"
 
#include <QThread>
#include <QCloseEvent>
#include "autothreadobj.h"
 
QTmpWnd::QTmpWnd(QWidget *parent, Qt::WFlags flags)
	: QMainWindow(parent, flags)
{
	ui.setupUi(this);
	m_autoThread = new QThread;
	m_autoObj = new AutoThreadObj;
	m_autoObj->moveToThread(m_autoThread);
	connect(m_autoThread, SIGNAL(started()), m_autoObj, SLOT(process()), Qt::QueuedConnection);
	connect(m_autoObj, SIGNAL(finished()), m_autoThread, SLOT(quit()), Qt::QueuedConnection);	
	m_autoThread->start();
}
 
QTmpWnd::~QTmpWnd()
{
 
}
 
void QTmpWnd::closeEvent(QCloseEvent *e)
{
	if (m_autoThread->isRunning()) {
		m_autoObj->stop();
		m_autoThread->quit();
		m_autoThread->wait();
	}
	delete m_autoObj;
	delete m_autoThread;
	e->accept();
}