Antoine Pitrou added the comment:

I've decided it's better to raise a ValueError if the child process hasn't 
stopped yet.  After all, join() alone may have no effect: often you want to 
send the process a signal (a literal signal in UNIX terms, or a figurative 
signal such as write something on a socket, etc.) to ask it to terminate gently.

I'm gonna update the PR soon.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30596>
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