关于QT子线程无限循环主线程界面卡死的问题

ObsessionLife 2018-06-07 11:51:45

我的程序思路是主线程有两个按钮，点击开始，主线程给子线程发消息，子线程开始无限循环打印语句。点击结束，主线程通知子线程停止循环，子线程处理后通知主线程关闭该子线程。
但是遇到的问题是，子线程的无限循环开始后，主线程界面就卡死了。

#ifndef MYTHREAD_H

#define MYTHREAD_H



#include <QThread>

#include <QDebug>

#include <QMutex>

class MyThread : public QThread

{

	Q_OBJECT



public:

	void setData(double d1,double d2);

	MyThread();

	~MyThread();



private slots:

	void runslot(const double d1,const double d2);

	void stopslot(void);



signals:

	void callFather(void);



protected:

    void run() override;

private:

	double data1;

	double data2;

	bool is_stop;

	QMutex mutex;



	

};



#endif // MYTHREAD_H

#include "mythread.h"



MyThread::MyThread()

{

	is_stop = false;

}



MyThread::~MyThread()

{



}



void MyThread::runslot(const double d1,const double d2)

{

	int i = 0;

	while(true)

	{

		qDebug()<<i++<<d1<<" "<<d2<<endl;

		mutex.tryLock();

		if(is_stop || i == 100)

		{

			mutex.unlock();

			qDebug()<<"call father";

			emit callFather();

			break;



		}

		else{

			mutex.unlock();

		}

		msleep(100);

	}



	//emit callFather();

}

void MyThread::run()

{

	//is_stop = false;

	//exec();

}





void MyThread::stopslot(void)

{

	mutex.tryLock();

	is_stop = true;	

	mutex.unlock();



}



void MyThread::setData(double d1,double d2)

{

	data1 = d1;

	data2 = d2;

}

#ifndef TEST0517_H

#define TEST0517_H



#include <QtGui/QMainWindow>

#include "ui_test0517.h"

#include <QDebug>

#include "mythread.h"

class Test0517 : public QMainWindow

{

	Q_OBJECT



public:

	Test0517(QWidget *parent = 0, Qt::WFlags flags = 0);

	~Test0517();

	MyThread *mythread;

	//bool stoped = false;

 //   QMutex m_mutex; 





private:

	Ui::Test0517Class ui;



signals:

	void operate_start(double d1,double d2);

	void operate_stop(void);



private slots:

	void on_pushButton_2_clicked();

	void on_pushButton_clicked();

	void closeThread();





};



#endif // TEST0517_H

#include "test0517.h"

#include <QMessageBox>





Test0517::Test0517(QWidget *parent, Qt::WFlags flags)

	: QMainWindow(parent, flags)

{

	ui.setupUi(this);

	mythread = new MyThread();

	connect(this,SIGNAL(operate_start(double,double)),mythread,SLOT(runslot(double,double)));

	connect(this,SIGNAL(operate_stop(void)),mythread,SLOT(stopslot(void)));

	connect(mythread,SIGNAL(callFather(void)),this,SLOT(closeThread(void)));

	mythread->start();

	//QObject::connect(this,SIGNAL(operate_stop),&mythread,SLOT(runslot));

	//connect(this,SIGNAL(operate_stop),&mythread,SLOT(stopslot));



}



Test0517::~Test0517()

{



}





void Test0517::on_pushButton_clicked()

{

	emit operate_start(1.5,1.5);

	//mythread.start();

}





void Test0517::on_pushButton_2_clicked()

{

	emit operate_stop();

}



void Test0517::closeThread()

{

	qDebug()<<"shutdown";

	mythread->quit();

}