Now that I've done some homework, everything you said is clear.
Mike Kazantsev wrote:
Pickle has nothing to do with the problem since it lay much deeper: in
the OS.
From kernel point of view, every process has it's own "descriptor
table" and the integer id of the descriptor is all the process gets, so
when you say "os.pipe()" kernel actually gives you a number which is
completely meaningless for any other process - it either doesn't exists
in it's descriptor table or points to something else.
So, what you actually need is to tell the kernel to duplicate
underlying object in another process' table (with it's own numbering),
which is usually done via special flag for sendmsg(2) in C, so you
should probably look out for py implementation of this call, which I
haven't stumbled upon, but, admittely, never looked for.
sendmsg is a missing feature of the socket module.
http://bugs.python.org/issue1194378
And this implements it:
http://pypi.python.org/pypi/python-eunuchs/0.0.0
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