user interface - Should I use QCoreApplication::processEvents() or QApplication::processEvents()?

Question

I have a method which is called from both QThreads and the main thread. this method can sometimes take a long time to do its computations in a loop so I put QCoreApplication::processEvents() and this prevents the GUI from freezing. At some point I had changed QCoreApplication::processEvents() for QApplication::processEvents() but that caused the GUI to freeze (im pretty sure thats what was fereezing it because since I put QCoreApplication::processEvents() back it hasnt frozen again) Am I right to think that calling QApplication::processEvents() from both the main thread and QThreads can freeze the GUI?

Answer 1

Neither, processEvent() should be calld only when you have actual pending events to process. You may find this useful : How to make Qt work when main thread is busy?