Thread refuses to quit

tahayassen

It is supposed to stop in myobject.cpp with QThread::currentThread()->quit(); but it doesn't.

main.cpp:
@#include <QCoreApplication>
#include <QtCore>
#include "myobject.h"

QThread* cThread;
MyObject* cObject;

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
cThread = new QThread();
cObject = new MyObject();
cObject->moveToThread(cThread);

QObject::connect(cThread, SIGNAL(started()),
                 cObject, SLOT(doWork()));

QObject::connect(cThread, SIGNAL(finished()),
                 cThread, SLOT(deleteLater()));

QObject::connect(cThread, SIGNAL(finished()),
                 cObject, SLOT(deleteLater()));

cThread->start();

return a.exec&#40;&#41;;

}@

myobject.cpp:
@#include "myobject.h"

MyObject::MyObject(QObject *parent) :
QObject(parent)
{
}

void MyObject::doWork()
{
qDebug() << "Hi";
QThread::currentThread()->quit(); // It is supposed to stop here, but it doesn't.
for (int i = 0; i < 1000000; i++) {
qDebug() << i;
}
}@

myobject.h:
@#ifndef MYOBJECT_H
#define MYOBJECT_H

#include <QtCore>

class MyObject : public QObject
{
Q_OBJECT
public:
explicit MyObject(QObject *parent = 0);

signals:

public slots:
void doWork();

};

#endif // MYOBJECT_H@

ChrisW67

bq. void QThread::quit() [slot]
Tells the thread's event loop to exit with return code 0 (success). Equivalent to calling QThread::exit(0).

Processing must return to the event loop before it can exit, which does not happen until your million debug messages are emitted.

JKSH

To clarify ChrisW67's point: Qt will not stop your thread in the middle of a function. If your thread got the "quit" command in the middle of doWork(), the thread will wait until doWork() returns before quitting.

Terminating a thread in the middle of a function is dangerous and can cause data corruption.