PyQt4 Threading: Sending data back to a thread

Question

I'm writing a program, with a PyQt frontend. To ensure that the UI doesn't freeze up, I use QThreads to emit signals back to the parent. Now, I have reached a point where I need my thread to stop running, emit a signal back to the parent, then wait on the parent to return an approval for the thread to continue (after the user interacts with the UI a little bit).

I've been looking into the QMutex class, along with QThread's wait function.

How should I go about doing this properly?

Answer 1

One approach is using a condition variable .

In my code, however, I prefer using Python's built-in Queue objects to synchronize data between threads. While I'm at it, I use Python's threads as opposed to PyQt threads, mainly because it allows me to reuse the non-GUI part of the code without an actual GUI.