QThread : how to stop an infinite loop

[TarielVincent]

I execute in a Qthread an image processing procedure taking around 3 hours without the possibility to put some check points inside it for a exit gate. The problem is I cannot stop it. This code represents this problem :

class Toto : public QObject
{
    Q_OBJECT
    public slots:
    void exec(){      
        //I represent the real process  with an infinite loop
        while(1==1);
    }
};
int main(int argc, char *argv[])
{
    QApplication aa(argc, argv);
    QThread * t1 = new QThread;
    Toto * toto1 = new Toto;
    QThread * t2 = new QThread;
    Toto * toto2 = new Toto;
    QPushButton push;
    push.show();
    toto1->moveToThread(t1);
    toto2->moveToThread(t2);
    QMetaObject::invokeMethod(toto1, "exec", Qt::QueuedConnection);
    QMetaObject::invokeMethod(toto2, "exec", Qt::QueuedConnection);
    QApplication::connect(&push, SIGNAL(pressed()), t1,SLOT(terminate()), Qt::QueuedConnection);
    QApplication::connect(&push, SIGNAL(pressed ()), t2,SLOT(terminate()), Qt::QueuedConnection);
    t2->start();
    t1->start();
    return aa.exec();
}

class Toto : public QObject
{
    Q_OBJECT
    public slots:
    void exec(){      
        //I represent the real process  with an infinite loop
        while(1==1);
    }
};
int main(int argc, char *argv[])
{
    QApplication aa(argc, argv);
    QThread * t1 = new QThread;
    Toto * toto1 = new Toto;
    QThread * t2 = new QThread;
    Toto * toto2 = new Toto;
    QPushButton push;
    push.show();
    toto1->moveToThread(t1);
    toto2->moveToThread(t2);
    QMetaObject::invokeMethod(toto1, "exec", Qt::QueuedConnection);
    QMetaObject::invokeMethod(toto2, "exec", Qt::QueuedConnection);
    QApplication::connect(&push, SIGNAL(pressed()), t1,SLOT(terminate()), Qt::QueuedConnection);
    QApplication::connect(&push, SIGNAL(pressed ()), t2,SLOT(terminate()), Qt::QueuedConnection);
    t2->start();
    t1->start();
    return aa.exec();
}

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The problem is my infinite loop is not interrupted when I press the buttom.
Do you have any idea to solve this problem?
Thanks,
Vincent