[issue35627] multiprocessing.queue in 3.7.2 doesn't behave as it was in 3.7.1

Tom Wilson added the comment: In case this is a clue - the attached script "mp_hang2.py" adds a call to qsize() and uses only a single consumer. When I run it from the command line it does one of two things: Option 1: C:\TEMP\Py-3.7.2b-Venv\Scripts>.\python.exe "C

[issue35627] multiprocessing.queue in 3.7.2 doesn't behave as it was in 3.7.1

Tom Wilson added the comment: Hi there. I get this behavior as well, although only in a venv. Main Virtual v3.7.1:260ec2c36a CompletesCompletes v3.7.2:9a3ffc0492 Completes Hangs Some other details of my setup: - Windows 10 Pro, Version 1803 (OS