I wrote:
> Uh ... so the lock-file stuff is completely broken on Windows?

Not so much broken as commented out ... on looking at the code, it's
blindingly obvious that we don't even try to create a socket lock file
if not HAVE_UNIX_SOCKETS. Sigh.

There is a related risk even on Unix machines: two postmasters can be
started on the same port number if they have different settings of
unix_socket_directory, and then it's indeterminate which one you will
contact if you connect to the TCP port. I seem to recall that we
discussed this several years ago, and didn't really find a satisfactory
way of interlocking the TCP port per se.

regards, tom lane

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