QTthreadPool 程序

//*******************主窗口****************************//
------------------------.H---------------------------------
-----------------------------------------------------------
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QPushButton>
#include <QLabel>
#include <work.h>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    Ui::MainWindow *ui;

    QPushButton *btnStart;
    QPushButton *btnStop;
    QLabel *label;

    work *w;
};
#endif // MAINWINDOW_H

------------------------.CPP-------------------------------
-----------------------------------------------------------
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "qthreadpool.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    btnStart = new QPushButton(this);
    btnStart->resize(50,40);
    btnStart->move(10,10);
    btnStart->setText("start");

    btnStop = new QPushButton(this);
    btnStop->resize(50,40);
    btnStop->move(100,10);
    btnStop->setText("stop");

    label = new QLabel(this);
    label->resize(100,40);
    label->move(50,100);
    label->setText("0");

    w = new work;

    connect(w,&work::currentNum,this,[=](int num){
        label->setText(QString::number(num));
    });

    connect(btnStart,&QPushButton::clicked,this,[=](){
        if(!w->isRun)
        {
            QThreadPool::globalInstance()->start(w);
        }
    });

    connect(btnStop,&QPushButton::clicked,this,[=](){
        w->changeIsRun();
    });
}

MainWindow::~MainWindow()
{
    delete ui;
}

//*******************线程类****************************//
------------------------.H---------------------------------
-----------------------------------------------------------
#ifndef WORK_H
#define WORK_H

#include <QObject>
#include <QRunnable>
#include <QMutex>

class work : public QObject, public QRunnable
{
    Q_OBJECT
public:
    explicit work(QObject *parent = nullptr);

    QMutex mutex;
    int num;
    bool isRun;

    void run() override;

signals:
    void currentNum(int num);

public slots:
    void changeIsRun();
};

#endif // WORK_H

------------------------.CPP-------------------------------
-----------------------------------------------------------
#include "work.h"
#include "qthread.h"

work::work(QObject *parent) : QObject(parent), QRunnable()
{
    num = 0;
    setAutoDelete(false);
}

void work::run()
{
    mutex.lock();
    isRun = true;
    while(isRun)
    {
        num += 1;
        emit currentNum(num);
        QThread::sleep(1);
    }
    mutex.unlock();
}

void work::changeIsRun()
{
    isRun = false;
}