[issue17925] asynchat.async_chat.initiate_send : del deque[0] is not safe

[Xavier de Gaye]

Xavier de Gaye added the comment:

extendleft is an extension module C function (in the _collections
module) that does not release the GIL, so it is thread safe.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17925>
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