How to debug lost events posted from non-GUI thread in Qt?

Posted by gp on Stack Overflow See other posts from Stack Overflow or by gp
Published on 2010-05-02T13:45:00Z Indexed on 2010/05/02 13:47 UTC
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As the subject says, I'm posting events from non-GUI thread (some GStreamer thread, to be precise). Code looks like this:

GstBusSyncReply on_bus_message(GstBus* bus, GstMessage* message, gpointer data)
{
    bool ret = QMetaObject::invokeMethod(static_cast<QObject*>(data), "stateChanged", Qt::QueuedConnection);
    Q_ASSERT(ret);

    return GST_BUS_PASS;
}

The problem is, stateChanged (doesn't matter whether it is a slot or signal) is not called. I've stepped into QMetaObject::invokeMethod with debugger, followed it till it called PostMessage (it is Qt 4.6.2 on Windows, by the way) – everything seemed to be OK.

Object pointed to by data lives in GUI thread, I've double-checked this.

How can I debug this problem? Or, better, maybe sidestep it altogether?

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