Qt线程同步操作用QWaitCondition QMutex

可以看到Qt提供了一个等待事件发生的类QWaitCondition，当条件满足时可以唤醒其它等待的线程。

 写一个类可以在线程间实现同步功能

#ifndef THREADEVENT_H

#define THREADEVENT_H



#include <QWaitCondition>

#include <QMutex>



class ThreadEvent

{

public:

    ThreadEvent(const char* name);

    void postMessage();

    bool waitMessage(unsigned long time = ULONG_MAX);

private:

    QWaitCondition waitConditionM;

    QMutex mutexM;

    char Name[64];

    bool bSatisfiedM;

};



#endif // THREADEVENT_H

 

#include "ThreadEvent.h"



ThreadEvent::ThreadEvent(const char* name)

{

    bSatisfiedM = false;

    strcpy(Name,name);

}



void ThreadEvent::postMessage()

{

    qDebug("ThreadEvent: %s\n",Name);

    mutexM.lock();

    bSatisfiedM = true;

    waitConditionM.wakeAll();

    mutexM.unlock();

}



bool ThreadEvent::waitMessage(unsigned long time)

{

    mutexM.lock();

    bool rtn = true;

    if(bSatisfiedM)

    {

        rtn = true;

    }

    else

    {

        rtn = waitConditionM.wait(&mutexM,time);



    }



    bSatisfiedM = false;

    mutexM.unlock();

    return rtn;

}

用法

 

ThreadEvent tevent;



thread1:

tevent.postMessage();



thread2:

tevent.waitMessage();

不管是thread1先到tevent，还是thread2先到tevent，这个类都可满足要求。