[issue21149] logging._removeHandlerRef is not threadsafe during interpreter shutdown

[Vinay Sajip]

Vinay Sajip added the comment:

The release notes say about PEP 442 that "As part of this change, module globals are no longer forcibly set to None during interpreter shutdown in most cases". I haven't looked at the PEP in detail, so I'm not sure specifically what "most cases" means - so I played it safe.

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<http://bugs.python.org/issue21149>
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