程序目的是保证两个线程交替执行

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打印结果如下
Mythread————————-0
Mythread1————————1
Mythread—————————2
Mythread1————————–3

gdata.h

#ifndef GDATA_H
#define GDATA_H
#include <mutex>
#include <iostream>
#include <QSemaphore>class Gdata
{
public:Gdata();QSemaphore * sem1;QSemaphore * sem2;int gNum;
};#endif // GDATA_H

gdata.cpp

#include "gdata.h"
Gdata::Gdata()
{sem1 = new QSemaphore(0);sem2 = new QSemaphore(0);gNum = 0;
}

mythread.h

#ifndef MYTHREAD_H
#define MYTHREAD_H
#include "gdata.h"
#include <QThread>
class Mythread : public QThread
{
public:Mythread(Gdata * pData);void star();void run();Gdata * pData;
};#endif // MYTHREAD_H

mythread.cpp

#include "mythread.h"
#include <QDebug>
Mythread::Mythread(Gdata *pData)
{this->pData = pData;
}void Mythread::star()
{QThread::start();
}void Mythread::run()
{while(1){qDebug() << "Mythread------------------------%d " << pData->gNum ++ ;pData->sem1->release(); // +1msleep(200);pData->sem2->acquire(); // -1}
}

mythread1.h

#ifndef MYTHREAD1_H
#define MYTHREAD1_H
#include <QThread>
#include "gdata.h"
class Mythread1 : public QThread
{
public:Mythread1(Gdata * pData);void run();void star();Gdata * pData;
};#endif // MYTHREAD1_H

mythread1.cpp

#include "mythread1.h"
#include <QDebug>
Mythread1::Mythread1(Gdata *pData)
{this->pData = pData;
}void Mythread1::run()
{while(1){pData->sem1->acquire(); // -1qDebug() << "Mythread1................." << pData->gNum ++;msleep(30);pData->sem2->release(); // +1}
}void Mythread1::star()
{QThread::start();
}

main.cpp

#include <QCoreApplication>
#include "mythread.h"
#include "mythread1.h"
#include "gdata.h"int main(int argc, char *argv[])
{Gdata * pGdata = new Gdata();Mythread t(pGdata);Mythread1 t1(pGdata);t.star();t1.star();QCoreApplication a(argc, argv);return a.exec();
}