线程是操作系统能够调用的最小运算单位，包含在进程之中。

1：QThread

在Qt中集成QThread是最为常规的实现线程的方式，此方式易于理解便于操作。只需要重写Run()函数，实现自己的线程工作即可。

#pragma once
#include <QObject>
#include <QThread>
#include <qDebug>

class Qthreadtest : public QThread
{
	Q_OBJECT
public:
	Qthreadtest(QObject* parent = nullptr);
	~Qthreadtest();

protected:
	virtual void run() override;
public:
	void stopThread();

private:
	bool b_stop = false;
};

#include "Qthreadtest.h"

Qthreadtest::Qthreadtest(QObject* parent /*= nullptr*/)
{

}

Qthreadtest::~Qthreadtest()
{

}

void Qthreadtest::run()
{
	while (!b_stop)
	{
		qDebug() << "test";
		msleep(500);
	} 
	quit();
}

void Qthreadtest::stopThread()
{
	b_stop = true;
}

首先生成Qthreadtest类，然后使用start()进行调用

 Qthreadtest m_Qthreadtest = new Qthreadtest(this);
 m_Qthreadtest->start();

如果需要退出线程，则执行

 m_Qthreadtest->stopThread();
 //如果退出程序，则在析构中执行：
 m_Qthreadtest->quit();
 m_Qthreadtest->wait();

2: moveToThread

所有继承自QObject的类都可以使用moveToThread()将自己的函数功能放到线程中运行。

#include "moveObject.h"
#include <QThread>

moveObject::moveObject(QObject* parent /*= nullptr*/)
	:QObject(parent)
{

}

moveObject::~moveObject()
{

}

void moveObject::DoWorks()
{
	while (!b_stop)
	{
		qDebug() << "dddddd";
		QThread::sleep(1);
	}
}

void moveObject::StopWorks()
{
	b_stop = true;
}

#pragma once

#include <QObject>
#include <QDebug>

class moveObject : public QObject
{
	Q_OBJECT
public:
	moveObject(QObject* parent = nullptr);
	~moveObject();

	void StopWorks();

public slots:
	void DoWorks();
	

private:
	bool b_stop = false;
};

调用：

    _moveObject = new moveObject();
    moveThrea = new QThread();
    _moveObject->moveToThread(moveThrea);
    connect(moveThrea, &QThread::started, _moveObject, &moveObject::DoWorks);
     moveThrea->start();

退出：

     _moveObject->StopWorks();
    moveThrea->quit();
    moveThrea->wait();

3：QThreadPool

QThreadPool是一个用于关于和调度线程的类。首先创建一个QThreadPool对象，并向线程池提交任务，任务可以是任何实现了QRunable的接口对象。例子如下：

#pragma once
#include <QObject>
#include <QThread>
#include <qDebug>

class Qthreadtest : public QThread
{
	Q_OBJECT
public:
	Qthreadtest(QObject* parent = nullptr);
	~Qthreadtest();

protected:
	virtual void run() override;
public:
	void stopThread();

private:
	bool b_stop = false;
};

#include "Qthreadtest.h"

Qthreadtest::Qthreadtest(QObject* parent /*= nullptr*/)
{

}

Qthreadtest::~Qthreadtest()
{

}

void Qthreadtest::run()
{
	while (!b_stop)
	{
		qDebug() << "test";
		msleep(500);
	} 
	quit();
	wait();
}

void Qthreadtest::stopThread()
{
	b_stop = true;
}

进行调用：

	QThreadPool* pool = QThreadPool::globalInstance();
	pool->setMaxThreadCount(4);
	for (int i = 0; i <= 10; i++)
	{
		m_RunableTest = new RunableTest();
		pool->start(m_RunableTest);
	}

结束，销毁线程池

    QThreadPool* pool = QThreadPool::globalInstance();
    pool->clear();
    pool->waitForDone();
    delete pool;