[3.10] bpo-37788: Fix reference leak when Thread is never joined (GH-26103) #26138
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When a Thread is not joined after it has stopped, its lock may remain in the _shutdown_locks set until interpreter shutdown. If many threads are created this way, the _shutdown_locks set could therefore grow endlessly. To avoid such a situation, purge expired locks each time a new one is added or removed.
(cherry picked from commit c10c2ec)
Co-authored-by: Antoine Pitrou antoine@python.org
https://bugs.python.org/issue37788
Automerge-Triggered-By: GH:pitrou