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>> That's a problem indeed. Perhaps we need a global "fork lock" shared
>> between subprocess and multiprocessing?
>
> I did an atfork patch which included a (recursive) fork lock. See
>
>  http://bugs.python.org/review/6721/show
>
> The patch included changes to multiprocessing and subprocess. (Being able to acquire the lock when doing fd manipulation is quite useful. For instance, the creation of Process.sentinel currently has a race which can mean than another process inherits the write end of the pipe. That would cause Process.join() to wait till both processes terminate.)
Indeed, I had a look and it looked good.
I just had a couple minor comments, I'll try to get back to this later
today, or by the end of the week.
> Actually, for Finalizers I think it would be easier to just record and check the pid.
I'd prefer this too.