title: QThread: Call child thread method from main thread
body: <p>I have a thread created by inheriting <code>QThread</code> in which I called <code>exec()</code> to initiate the event loop. And this class that inherits <code>QThread</code> has a method in it.</p>
  
  <p>How can I call that method from the main thread for it to execute in the child thread?
  I assume that the execution of that method has to be queued in the child thread's event loop, so calling <code>threadObject-&gt;childThreadMethod()</code> won't be a good idea.
  Is there any solution to this?</p>