[issue8184] multiprocessing.managers will not fail if listening ocket already in use

[Charles-François Natali]

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

> Like I said, I dont know much about named pipes and im not even sure thats how they are intended to work in this context. IE: if one process is listening, can another listen on that named pipe as well?

Under Unix, you'd get a EADDRINUSE with a Unix domain socket.

I don't know much about Windows, but here's what CreateNamedPipe doc says:
"""
FILE_FLAG_FIRST_PIPE_INSTANCE
0x00080000
If you attempt to create multiple instances of a pipe with this flag,
creation of the first instance succeeds, but creation of the next
instance fails with ERROR_ACCESS_DENIED.
Windows 2000:  This flag is not supported until Windows 2000 SP2 and Windows XP.
"""

So it seems that we should probably pass FILE_FLAG_FIRST_PIPE_INSTANCE
under Windows.

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<http://bugs.python.org/issue8184>
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