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

[Martin Panter]

Martin Panter <vadmium+py at gmail.com> added the comment:

Anselm's pull request PR 15175 looked hopeful to me. I've been using those changes in our builds at work for a while.

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