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

[A. Jesse Jiryu Davis]

A. Jesse Jiryu Davis added the comment:

Charles-François, I agree that many guarantees are impossible to enforce in a multithreaded application that calls fork().

But the threading module does try to guarantee, after a fork, that isAlive() is False for all threads but one. I claim that it can more reliably provide this guarantee with my patch applied.

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