[issue30931] Race condition in asyncore may access the wrong dispatcher

[Giampaolo Rodola']

Giampaolo Rodola' added the comment:

> Yes, this is a typical issue in asyncore if you don't protect your
> subclass to handle double close.

I use the same trick all over the place in pyftpdlib:
https://github.com/giampaolo/pyftpdlib/blob/1268bb185cd63c657d78bc33309041628e62360a/pyftpdlib/handlers.py#L537
In practical terms, does this bug report aim to fix this issue?

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nosy: +giampaolo.rodola

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30931>
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