The queue module provides a thread-safe queue for passing data between threads. A worker can place progress updates into the queue while the main thread retrieves them and updates the user interface, avoiding shared-data race conditions. section 7.4.2
A practical worker-to-UI pattern uses the queue as a handoff point:
- Have the worker put progress updates into the queue. section 7.4.2
- Poll the queue from the main UI thread and apply available updates. section 7.4.2
Progress updates in a Tkinter load tester
A Tkinter application stores a Queue, polls it every 25 milliseconds with after, and updates its progress bar from the main thread while an asyncio event loop runs in another thread.
