[issue18418] Thread.isAlive() sometimes True after fork

[Charles-François Natali]

Charles-François Natali added the comment:

> 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.

Actually, setting sys.setswitchinterval(1e-6) makes it fairly easy to reproduce.

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<http://bugs.python.org/issue18418>
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