[issue39557] ThreadPoolExecutor is busy-waiting when idle.

[Avraham Mahfuda]

Avraham Mahfuda <avraham.mahfuda at bloxroute.com> added the comment:

If I understand the following code correctly, there seems to be a busy loop waiting for the SimpleQueue.put to signal that an item was entered to queue.
https://github.com/python/cpython/blob/3.7/Modules/_queuemodule.c#L217

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39557>
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