[issue30985] Set closing variable in asyncore at close

[STINNER Victor]

STINNER Victor added the comment:

"Fixing closing attribute will allow fixing the races during asyncore.poll() and asyncore.poll2(), see https://github.com/python/cpython/pull/2764"

Aha, *slowly* I understand that asyncore is vulnerable to multiple race conditions, and it seems lile we require to set a new closing attribute to fix it.

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<http://bugs.python.org/issue30985>
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