[issue20516] Concurrent.futures base concurrency improvement (with patch)

[Glenn Langford]

Glenn Langford added the comment:

> Actually, I think what you're seeing here is the context manager being
garbage collected

Yes indeed, I am with you now. Thanks for identifying the problem, and for your explanation. The future should not be yielded while locked.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20516>
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