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Thread: how to stop thread while thread is running?

  1. #1
    Join Date
    May 2018
    Posts
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    Qt products
    Qt5 Qt/Embedded
    Platforms
    Unix/X11 Windows

    Default how to stop thread while thread is running?

    I have a Class DeviceManager:

    Qt Code:
    1. DeviceManager(QObject *parent) :
    2. QObject(parent)
    3. {
    4. thread = new QThread();
    5. this->moveToThread(thread);
    6. connect(thread, SIGNAL(started()), this, SLOT(autoDetect()));
    7. thread->start();
    8. }
    9.  
    10. void autoDetect()
    11. {
    12. ...
    13. emit addDevice();
    14. ...
    15. }
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    Class MainForm:
    Qt Code:
    1. MainForm(QObject *parent) :
    2. QObject(parent)
    3. {
    4. this->manager = new DeviceManager();
    5. connect(manager, SIGNAL(addDevice()), this, SLOT(slot()));
    6.  
    7. }
    8.  
    9. void refresh()
    10. {
    11. this->manager->deleteLater();
    12. this->manager = new DeviceManager();
    13. connect(manager, SIGNAL(addDevice()), this, SLOT(slot()));
    14. }
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    I have a problem is manager don't disconnect. When mainForm call refresh many time (eg: 3 times), then when slot() is executed 4 times.
    I think that the older manager's connect is disconnect or object can't deleted.
    I tried delete thread but I got message:
    QThread: Destroyed while thread is still running
    How to stop thread while thread is still running?
    Last edited by madawg; 30th May 2018 at 08:53.

  2. #2
    Join Date
    Jan 2006
    Location
    Bremen, Germany
    Posts
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    Qt products
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    Platforms
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    Default Re: how to stop thread while thread is running?

    For disconnect: QObject has also a function for disconnecting signals & slots
    For thread: The thread has to leave the run() method. If you did not reimplement them, calling QThread::exit() should suffice. Then you must wait until the thread has finished - see QThread documentation

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