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

[STINNER Victor]

STINNER Victor added the comment:

Much shorter summary:

* Handlers of dispatcher must not be called if the dispatcher was called.
* If a dispatcher is closed between the execution of two of his handlers, the next handlers should not be called

My PR 2854 adds 3 unit tests to verify this behaviour of 3 different "race conditions".

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