Several ways of QT thread exit

QTread sign out , There are several ways , Using variables ; You can also use QWaitCondition;

1. Using variables , Set the external variable to false

#define WORKOBJECT_H


#include <QObject>
#include <QThread>
#include <QDebug>

#include<QMutexLocker>
#include<QMutex>
#include<QWaitCondition>

class WorkObject : public QObject
{

  Q_OBJECT
public:
     explicit WorkObject(QObject *parent = nullptr);

signals:

public slots:
    void doWork();

    void stopWork();
private:
    bool exitflag;

    QWaitCondition mWaitStatusCondition;
    QMutex mWaitMutex;
};

#endif // WORKOBJECT_H

cpp

#include "workobject.h"

WorkObject::WorkObject(QObject *parent) : QObject(parent)
{

}
void WorkObject::doWork()
{
  
    while(true)
    {
        QMutexLocker locker(&mWaitMutex);
        if(!exitflag)
        {
            qDebug() << "MyThread eixt ================  :" ;
            return;
        }
      //  if(mWaitStatusCondition.wait(&mWaitMutex,1))
       // {
      //    qDebug() << "MyThread eixt ================  :" ;
       //   return;
       // }

        qDebug() << "MyThread thread id:" << QThread::currentThreadId();
        //sleep(10);
        //QThread::sleep(1);
    }

    qDebug() << "doWork thread exit========:" << QThread::currentThreadId();
}

void WorkObject::stopWork()
{
    QMutexLocker locker(&mWaitMutex);
   {
      exitflag = false;
     //   mWaitStatusCondition.wakeAll();
  
   }
}

2. You can also use QWaitCondition

QWaitCondition The biggest benefit , I thought , It can wake up one or more other threads in one thread , Of course, the premise is , Other threads are waiting for a QWaitCondition, Otherwise it won't work , It's no use waking you up .QWaitCondition Must be with QMutex perhaps QReadwriteLock Use... Together

 mWaitStatusCondition.wakeAll();

#include "workobject.h"

WorkObject::WorkObject(QObject *parent) : QObject(parent)
{

}
void WorkObject::doWork()
{
  
    while(true)
    {
        QMutexLocker locker(&mWaitMutex);
        if(!exitflag)
        {
            return;
        }
        if(mWaitStatusCondition.wait(&mWaitMutex,1))
        {
          qDebug() << "MyThread eixt ================  :" ;
          return;
        }

        qDebug() << "MyThread thread id:" << QThread::currentThreadId();
        //sleep(10);
        //QThread::sleep(1);
    }

    qDebug() << "doWork thread exit========:" << QThread::currentThreadId();
}

void WorkObject::stopWork()
{
    QMutexLocker locker(&mWaitMutex);
   {
      //exitflag = false;
        mWaitStatusCondition.wakeAll();
  
   }
}