new QWidget in separate thread

[wysota]

Now, my question is: what is the best way for a thread to pause until a signal is received.

There are two nice possibilities. One is to use custom events instead of signals and use sendEvent() instead of postEvent(). This should make the sending thread block until the event is processed. The other solution is to use blocking signal connections. See the description of QObject::connect() and the description of Qt::BlockingQueuedConnection which you should use. Your code will be much cleaner than when using wait conditions.