Qt的多线程

Qt的多线程

flyfish

环境
Qt版本 5.11.2
VS2017

线程start函数会调用run函数
线程状态 isfinished() isRunning()

右键选择一个文件夹 Add Qt Class

Welcome to the Qt Class Wizard

Base class: QThread
Class Name：MyThread

Insert Q_OBJECT macro

实例1 简单的使用防止界面阻塞

MyThread.h

#pragma once

#include <QThread>

class MyThread : public QThread
{
	Q_OBJECT

public:
	MyThread(int num);
	~MyThread();
private:
	bool threadStop;
	int number;
public:
	void stop();
protected:
	void run();
};

MyThread.cpp

#include "stdafx.h"
#include "MyThread.h"

MyThread::MyThread(int num)
{
	number = num;
}

MyThread::~MyThread()
{
}
void MyThread::stop()
{
	threadStop = true;
	qDebug("[%d] Thread stop", number);
}
void MyThread::run()
{
	threadStop = false;
	int i = 0;     
    while (!threadStop)
	{
		qDebug("[%d] MyThread %d", number, i);
		i++;
		sleep(1);
	}
}

QtGuiApplicationThread.h

#pragma once

#include <QtWidgets/QMainWindow>
#include "ui_QtGuiApplicationThread.h"
#include "MyThread.h"

class QtGuiApplicationThread : public QMainWindow
{
	Q_OBJECT

public:
	QtGuiApplicationThread(QWidget *parent = Q_NULLPTR);

private:
	Ui::QtGuiApplicationThreadClass ui;

public:
	MyThread *thread1;
private slots:
	void btn_start();
	void btn_stop();

};

QtGuiApplicationThread.cpp

#include "stdafx.h"
#include "QtGuiApplicationThread.h"

QtGuiApplicationThread::QtGuiApplicationThread(QWidget *parent)
	: QMainWindow(parent)
{
	ui.setupUi(this);
	thread1 = new MyThread(1);


	connect(ui.btn_start, SIGNAL(clicked()), this, SLOT(btn_start()));  
	connect(ui.btn_stop, SIGNAL(clicked()), this, SLOT(btn_stop()));   
}

void QtGuiApplicationThread::btn_start()
{
	thread1->start();
}

void QtGuiApplicationThread::btn_stop()
{
	thread1->stop();

}

实例2

生产者生产完任务然后通知消费者消费

MyThread.h

#pragma once

#include <QThread>
#include <QMutex>


class Producer : public QThread
{
	Q_OBJECT

public:
	Producer();
	~Producer();
protected:
	void run();


};

class Consumer : public QThread
{
	Q_OBJECT

public:
	Consumer();
	~Consumer();

public:
	void run();
};

MyThread.cpp

#include "stdafx.h"
#include "MyThread.h"

QWaitCondition g_increase_number;
QMutex g_mutex;
int task_count = 10;
int current_pos = 0;

Producer::Producer()
{
}

Producer::~Producer()
{
}
void Producer::run()
{
	g_mutex.lock();
	for (int i = 0; i<task_count; i++)
	{
		qDebug("Producer %d", current_pos);
		current_pos++;
	}
	g_increase_number.wakeAll();
	g_mutex.unlock();

}

Consumer::Consumer()
{
}

Consumer::~Consumer()
{
}
void Consumer::run()
{
		g_mutex.lock();
		g_increase_number.wait(&g_mutex);
		qDebug("Consumer %d", current_pos);
		g_mutex.unlock();
}

调用方法

声明
public:
	Producer* producer_;
	Consumer *consumer_;

实现
producer_=new Producer;
consumer_=new Consumer;
producer_->start();
consumer_->start();

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