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qtqt4qthread

Qt - don't destroy thread after slot is finished

Is there a way to prevent a thread created inside a slot to be destroyed, after the slot is finished ?

    <widget.cpp>

    ...
    void Widget::<slot_name>()
    {
        ...
        ThreadTask Watcher; //ThreadTask is defined in header file
        QThread WatcherThread;
        Watcher.moveToThread(&WatcherThread);
        QObject::connect ...
        WatcherThread.start();
        ...
    }

I know I could declare the thread outside the slot and only start it from it, but the thing is, I would like to create another thread if the same slot is triggered again.

Solution

  • Use dynamic allocation :

    QThread* WatcherThread = new Qthread();

    Notice that you must delete it when the thread's execution has finished in order to avoid a memory leak.

    Qt could automatically delete the thread when it finishes if you use the following code:

    connect(WatcherThread , SIGNAL(finished()),
    WatcherThread , SLOT(deleteLater()));