[issue21009] Potential deadlock in concurrent futures when garbage collection occurs during Queue.get

[Davin Potts]

Changes by Davin Potts <python at discontinuity.net>:


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superseder:  -> queue.Queue() is not reentrant, so signals and GC can cause deadlocks

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21009>
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