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bpo-37788: Fix reference leak when Thread is never joined (GH-26103)

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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.
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Antoine Pitrou 2021-05-14 21:37:20 +02:00 • committed by GitHub
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Fix a reference leak when a Thread object is never joined.