QT开发之多线程

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在Linux中我们经常使用多线程编程,同时就会提出同步和异步操作.像原子变量,信号量,阻塞,自旋锁,互斥所等,在Qt中也有类似的概念,但是在我的开发中用的不是很多,下面列举一下多线程编程的基础.

新建一个Gui应用项目,代码注释的非常详细.

创建线程后,启动线程默认是run函数,除非有特殊指定

dialog.h

#ifndef DIALOG_H#define DIALOG_H#include <QDialog>#include <QThread>namespace Ui {class Dialog;}class MyThread : public QThread{    Q_OBJECTpublic:    explicit MyThread(QObject *parent = 0);    void stop();protected:    void run();private:    volatile bool stopped;    int shareValue;signals:public slots:};class Dialog : public QDialog{    Q_OBJECT    public:    explicit Dialog(QWidget *parent = 0);    ~Dialog();    private slots:    void on_startButton_clicked();    void on_stopButton_clicked();    void on_startButton_2_clicked();    void on_stopButton_2_clicked();private:    Ui::Dialog *ui;    MyThread thread1,thread2;};#endif // DIALOG_H

dialog.cpp

#include "dialog.h"#include "ui_dialog.h"#include <QDebug>/* A B线程共同去访问某一资源测试 */Dialog::Dialog(QWidget *parent) :    QDialog(parent),    ui(new Ui::Dialog){    ui->setupUi(this);    //connect(&thread1,SIGNAL(started()),this,SLOT(startThread1()));    //connect(&thread1,SIGNAL(finished()),this,SLOT(stopThread1()));}Dialog::~Dialog(){    delete ui;}MyThread::MyThread(QObject *parent) : /* 构造函数 */    QThread(parent){    stopped = false;    shareValue = 0;}void MyThread::run()  /* start()函数默认会调用run()函数 */{    //int i = 0;    while (!stopped){        //qDebug() << QString("in MyThread: %1").arg(i++);        msleep(1000);        qDebug() << "shareValue" << shareValue++ << endl;        //i++;    }    stopped = false;}void MyThread::stop(){    stopped = true;}/* A线程操作 */void Dialog::on_startButton_clicked(){    thread1.start();    //thread.wait()   /* 同步终止 */    ui->startButton->setEnabled(false);    ui->stopButton->setEnabled(true);    //int Thread = thread1.currentThreadId();}void Dialog::on_stopButton_clicked(){    if(thread1.isRunning()){        thread1.stop();        ui->startButton->setEnabled(true);        ui->stopButton->setEnabled(false);    }}/* B 线程操作 */void Dialog::on_startButton_2_clicked(){    thread2.start();    //thread.wait()   /* 同步终止 */    ui->startButton_2->setEnabled(false);    ui->stopButton_2->setEnabled(true);}void Dialog::on_stopButton_2_clicked(){    if(thread2.isRunning()){        thread2.stop();        ui->startButton_2->setEnabled(true);        ui->stopButton_2->setEnabled(false);    }}

界面效果:

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