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Editorial Team
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Asked: 2026-06-06T13:31:31+00:00

I was digging into some source code I am working on. I found a

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I was digging into some source code I am working on. I found a peculiar statement that someone had coded. The source code is a GUI application with a QML GUI and uses QT 4.7.x.

The snippet below belongs to core application logic.

// connect signal-slots for decoupling
QObject::connect (this, SIGNAL(setCurrentTaskSignal(int)), this, 
    SLOT(SetCurrentTaskSlot(int)), Qt::QueuedConnection);

It’s strange that the object connects to itself via a queued connection which essentially means that the object may “live” in different threads at the same time?

At first glance It didn’t made any sense to me. Can anyone think of any reason why such a connection would be plausible or needed?. Would this even work?

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1 Answer

  1. Editorial Team

    It will work without any problem. Maybe there was some event loop processing required before calling SetCurrentTaskSlot?

    Note that QueuedConnection doesn’t mean that something is in different thread. QueuedConnection means only that when signal is emitted, corresponding slot won’t be called directly. It will be queued on event loop, and will be processed when control will be given back to event loop

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