[issue37788] fix for bpo-36402 (threading._shutdown() race condition) causes reference leak

[Antoine Pitrou]

Change by Antoine Pitrou <pitrou at free.fr>:


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nosy: +pitrou
nosy_count: 13.0 -> 14.0
pull_requests: +24745
pull_request: https://github.com/python/cpython/pull/26103

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37788>
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