[issue16500] Add an 'atfork' module

[Richard Oudkerk]

Richard Oudkerk added the comment:

> Richard, do you have time to get your patch ready for 3.4?

Yes.  But we don't seem to have concensus on how to handle exceptions.  The main question is whether a failed prepare callback should prevent the fork from happenning, or just be printed.

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<http://bugs.python.org/issue16500>
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