passing a socket to a subprocess in windows

[Daniel Platz]

Hello!

I have a problem with passing a socket to a subprocess in windows. It
works in Linux and for windows there is a workaround in the Python
doc. However, this workaround does not work. It was already noted by
other people and they Python issue tracker

http://bugs.python.org/issue5879
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the example from

http://docs.python.org/library/multiprocessing.html?highlight=multiprocessing#module-multiprocessing

named "
# Example where a pool of http servers share a single listening socket
#
"
does not work on windows.

Reason:

s = socket.fromfd(fd, family, type_, proto)

in line 156 of reduction.py

fails, because fromfd is not available on windows. Sad thing:
reduction.py was put into processing.py exactly to solve that problem
(i.e. reduction.py is provided as workaround for socket.fromfd not
available on windows, from the documentation:
if sys.platform == 'win32':
    import multiprocessing.reduction
    # make sockets pickable/inheritable


the solution within processing was:

try:
    fromfd = socket.fromfd
except AttributeError:
    def fromfd(fd, family, type, proto=0):
        s = socket._socket.socket()
        _processing.changeFd(s, fd, family, type, proto)
        return s

but: _multiprocessing has no longer a method changeFd.

Harald
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Has someone information about this or can help me to solve the
problem.

Thanks in advance

Daniel