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 ?