Stopping the execution of a QThread when a signal is emitted from another thread

sergex

Hello,

In my application I have two intensive operations that I start a new Thread to run them. What I am trying to accomplish is that when for example Thread 1 is finished, I want to end Thread 2. Only if Thread 1 is done I will want to end the execution of the function in Thread 2.

How I am starting my Threads is:
@

   //Thread 1
    QThread* thread = new QThread;
    Worker* worker = new Worker; // AQObject 
    worker->moveToThread(thread);

    connect(thread, SIGNAL(started()), worker, SLOT(process()));   //in process the intensive function is called 
    connect(worker, SIGNAL(finished()), thread, SLOT(quit()));
    connect(worker, SIGNAL(finished()), worker, SLOT(deleteLater()));
    connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
    thread->start();

  Q_EMIT startThread2(); // Signal connected to slot that starts thread 2 in the same way.

@

How Could I go about doing this?

Thanks.

SGaist

Hi,

What about:

@connect(worker, SIGNAL(finished()), thread2, SLOT(start()));@

?

sergex

I think I managed to stop the execution of the thread when I'm supposed to. However I am having the need to call a slot which is in the Qobject (Worker above) by emitting a signal from the main thread.

I tried doing a connection:

From main thread I just added this connection below :

@
.....
connect(this, SIGNAL(callSlot()), worker, SLOT(mySlotToExecute()));

thread->start();

.....
@

The signal callSlot is emitted after a key press.

But the slot is never called. Is this even possible somehow?

Thanks.

SGaist

How do you know the slot is not called ?

sergex

Because I have a qdebug() there and it never gets printed in the console and the process started doesn't stop like it should if that slot would be called.

SGaist

Did you checked on the console whether you got any error message concerning the connection ?