Qthread and child thread communication between other thread

[RahibeMeryem]

Hi,

I am creating threads in mainGUI thread with

    cam_01_thread = new QThread;
    cam_01 = new Camera01;
    cam_01->moveToThread(cam_01_thread);

    cam_02_thread = new QThread;
    cam_02 = new Camera_02;
    cam_02->moveToThread(cam_02_thread);

    frameProcess_thread = new QThread;
    process = new Camera_03;
    process->moveToThread(frameProcess_thread);

all can ben communicate with mainGUI thats okey.

I just wonder Can I use signal slot mechanism between these three threads ?

such as cam1 and cam2 thread sends Region of isterest to the Process frame and process frame decide to whether send to mainGUI or not ?

Or I can only communicate with the mainGui thread

[dheerendra]

You can use signals and slots between worker threads as well.

[RahibeMeryem]

@dheerendra
All three thread created by mainGUI thread.

So can we connect between these workers thread ?

[SGaist]

Hi,

Yes you can connect objects belonging to different threads.

[RahibeMeryem]

@dheerendra
@SGaist

may I ask a simple example ?

:)(:

[SGaist]

You have one in QThread's documentation.

[RahibeMeryem]

@SGaist

I saw the example the thread created in the same class that going to be signal/slot used.

Here the all three thread created in mainGUI inthat case how can I connect between these worker thread (signal/slot) or do I need to connectted only from mainGUI thread as broker ?

I didnt see an example that same scenario as above?
Best

[jsulm]

@RahibeMeryem

cam_01_thread = new QThread;
    cam_01 = new Camera01;
    cam_01->moveToThread(cam_01_thread);

    cam_02_thread = new QThread;
    cam_02 = new Camera_02;
    cam_02->moveToThread(cam_02_thread);

    frameProcess_thread = new QThread;
    process = new Camera_03;
    process->moveToThread(frameProcess_thread);
connect(cam_01, &Camera01::signal, cam_02, Camera_02::slot, Qt::QueuedConnection);

[J.Hilk]

@RahibeMeryem
nothing changes, really.

make your connect inside the main Thread - where you create the different threads & workes - because that class has acess the all your instances.

connect singal from worker 1 to slot of worker 2 and do the connect inside the main class/thread

---

jsulm was a bit faster ;-)

don't forget to subsditute signal and slot with actual signals&slots of your classes.

[VRonin]

This post is deleted!

[RahibeMeryem]

cant believe so simple..

need to refresh my coffee.

thanks a lot all dear friends.