QT多线程打印ABCABCABCABC...

代码：

#include 
#include 
#include 
#include 
#include 
#include 
QMutex mutex1_;
QMutex mutex2_;
QMutex mutex3_;
QWaitCondition condition1_;
QWaitCondition condition2_;
QWaitCondition condition3_;
class Thread1 : public QThread
{
public:
    Thread1(){}
protected:
    void run()
    {
        for(int i = 0;i < 10;++i)
        {
            mutex1_.lock();
            condition1_.wait(&mutex1_);
            mutex1_.unlock();
            qDebug()<"A";
            condition2_.wakeAll();
        }
    }
};
class Thread2:public QThread
{
public:
    Thread2(){}
protected:
    void run()
    {
        for(int i = 0;i < 10;++i)
        {
            mutex2_.lock();
            condition2_.wait(&mutex2_);
            mutex2_.unlock();
            qDebug()<"B";
            condition3_.wakeAll();
        }
    }
};
class Thread3:public QThread
{
public:
    Thread3(){}
protected:
    void run()
    {
        for(int i = 0;i < 10;++i)
        {
            mutex3_.lock();
            condition3_.wait(&mutex3_);
            mutex3_.unlock();
            qDebug()<"C";
            condition1_.wakeAll();
        }
    }
};
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    qDebug()<<"Main Thread ID"<1);
    condition1_.wakeAll();//确保线程启动后执行
    return a.exec();
}

使用mutex加condition，每个线程等待条件，被唤醒执行完成后唤醒下一个线程，效果：

代码链接：
https://github.com/yangyang0312/QtTestCode/tree/master/MultiThreadSync