Guido van Rossum added the comment:

Thanks, but I don't like the idea of that patch. It feels like a hack that 
makes it less likely that the issue occurs, but I don't feel we should rely on 
the callbacks being called before checking the selector again. There may be 
other reasons (perhaps a future modification to the code) why we might 
occasionally check the selector redundantly. IOW I think we should really 
ensure that all I/O callbacks are properly idempotent.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25593>
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