[issue29828] Allow registering after-fork initializers in multiprocessing

[Antoine Pitrou]

Antoine Pitrou added the comment:

> BTW, why can't you use `pthread_atfork` in numpy?

I suppose Numpy could use that, but it's much more involved than registering a Python-level callback.  Also it would only work because Numpy actually implements its random generator in C.

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<http://bugs.python.org/issue29828>
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