[issue8713] multiprocessing needs option to eschew fork() under Linux

[Charles-François Natali]

Charles-François Natali <neologix at free.fr> added the comment:

> There is probably lots of such code:

> I'm not convinced about making it the default behaviour, and 
> certainly not the only one.

Then I'm not convinced that this patch is useful.
Having three different implentations and code paths doesn't sound like a good idea to me.
fork() vs fork() + exec() is an implementation detail, and exposing such tweakables to the user will only make confusion worse.

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<http://bugs.python.org/issue8713>
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