Qt中互斥锁QMutex和QMutexLocker的使用

#ifndef MYTHREAD_H
#define MYTHREAD_H
#include <QThread>
#include <QMutex>
class MyThread : public QThread
{
    Q_OBJECT
public:
    explicit MyThread(QObject *parent = nullptr);
    void run();
private:
    static QMutex mutex;  // 多个线程使用一把锁
    static int num;       // 多个线程访问一个数据
};
#endif // MYTHREAD_H

#include "mythread.h"
#include <QDebug>
QMutex MyThread::mutex;
int MyThread::num = 0;
MyThread::MyThread(QObject *parent) : QThread(parent)
{
}
void MyThread::run()
{
    while (1) {
        this->mutex.lock();// 加锁
        qDebug() << "Current Thread: " << this
                  << ", Value: " << this->num++;
        this->mutex.unlock();// 解锁
        QThread::sleep(1);// 线程睡眠两秒
    }
}

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QPainter>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "mythread.h"
#include <QDebug>
#include <QLabel>
#include <QFileInfo>
#include <QPushButton>
#include <QHBoxLayout>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    MyThread *myThread1 = new MyThread(this);
    MyThread *myThread2 = new MyThread(this);
    myThread1->start();
    myThread2->start();
}
MainWindow::~MainWindow()
{
    delete ui;
}

#include "mythread.h"
#include <QDebug>
#include <QMutexLocker>
QMutex MyThread::mutex;
int MyThread::num = 0;
MyThread::MyThread(QObject *parent) : QThread(parent)
{
}
void MyThread::run()
{
    while (1) {
        // QMutexLocker:创建的时候加锁，当QMutexLocker局部销毁的时候解锁
        {
            QMutexLocker lock(&this->mutex);
            qDebug() << "Current Thread: " << this
                      << ", Value: " << this->num++;
        }
        QThread::sleep(1);// 线程睡眠两秒
    }
}