How quit QApplication with QThread

mk33

If is line with singleShot comment, program exit correctly (Worker destructor is called). What is correct way, how quit application if is called QCoreApplication::quit(). I need call Worker destructor.

#include <QCoreApplication>

#include <QThread>
#include <QDebug>
#include <QTimer>
#include <QAbstractEventDispatcher>

#include "Worker.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QThread* workerThread = new QThread();
    Worker* worker = new Worker();

    QObject::connect(workerThread, SIGNAL(started()), worker, SLOT(work()));
    QObject::connect(workerThread, SIGNAL(finished()), worker, SLOT(deleteLater()));
    QObject::connect(workerThread, SIGNAL(destroyed(QObject*)), worker, SLOT(deleteLater()));
    QObject::connect(worker, SIGNAL(finished()), workerThread, SLOT(quit()));
    QObject::connect(worker, SIGNAL(finished()), qApp, SLOT(quit()));
    worker->moveToThread(workerThread);
    workerThread->start();

    QTimer::singleShot(2000, qApp, [=](){QCoreApplication::quit();});

    int ret = a.exec();

    while (qApp->eventDispatcher()->processEvents(QEventLoop::AllEvents))
    {

    }

    qDebug() << "end with" << ret;
    return ret;
}

#ifndef WORKER_H
#define WORKER_H

#include <QObject>

class Worker : public QObject
{
    Q_OBJECT
public:
    Worker(QObject* parent = 0);
    ~Worker();

public slots:
    void work();

signals:
    void finished();
};

#endif // WORKER_H

#include "Worker.h"
#include <QDebug>

Worker::Worker(QObject* parent)
    : QObject(parent)
{

}

Worker::~Worker()
{
    qDebug() << "~Worker()";
}

void Worker::work()
{
    static int i = 0;

    while (1)
    {
        qDebug() << i++;
        if (i == 2e4)
        {
            break;
        }
    }
    emit finished();
}

SGaist

Hi,

You have to wait on your thread to be finished in that case.

QThread has such a method.

mk33

Problem solved. Thank you.

    int ret = a.exec();

    workerThread->quit();
    workerThread->wait();

SGaist

Great !

Then please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found :)

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