Gregory P. Smith added the comment:

This patch makes sense to me.  I've gone over the code and I cannot spot any 
adverse effects.  I was wondering in particular if anything would be surprised 
to find a non-started thread in _active within the short window where that will 
be true but nothing appears to care about that.

You should add a comment to the code mentioning this issue and why the .set() 
is done after the _active insertion.  After that, I'd say commit it.

If you want a consistent reproducible test case for this I believe you will 
need to replace the Thread object's __started with a test wrapper who's set() 
method blocks waiting for for the fork to have happened before doing the actual 
set().  That is a bit tricky and may not be worth it.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18418>
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