Wireshark-dev: Re: [Wireshark-dev] Slot on main thread not called when signal is emitted from a
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From: Gerald Combs <gerald@xxxxxxxxxxxxx>
Date: Tue, 15 Dec 2015 13:19:15 -0800
On 12/15/15 8:15 AM, Paul Offord wrote:

> When I run the code the extra thread starts OK and it starts to cycle
> around the loop with the 3 second sleep. However, the connected slot
> function Syncro::jumpToFrame(int new_frame) does not get called. If I
> change the connect from QueuedConnection to DirectConnection the slot
> function gets called but, as expected, in the context of my serviceThread.
> I need the slot function to run on the main thread.
> 
> I guess it is because my jumpToFrame slot function is not on the main
> thread event loop, but I don’t understand how to get it on the loop.

Can you try adding a constructor to Syncro, and add either

  moveToThread(QApplication::instance()->thread());

or

  setParent(QApplication::instance());

to it? I'm not sure if QObjects have a valid thread affinity by default.