I'm digging out of my list backlog, and I noticed you didn't get a reply.
So, this is just in case you haven't figured it out yet.
On Wed, 14 Jan 2004 Claude.Barrouil@onera.fr wrote:
...
At the time you wrote this, your best option was cygipc. You could have
read: /usr/share/doc/Cygwin/cygipc-*.README for details
Five days later, cygwin-1.5.6 was released with System V shm, sem, msg
handling in cygserver. It then became the prefered option. But,
cygserver and the documentation was accidentally left out of that release.
On the last day of January, cygwin-1.5.7 was released and included the
missing files. See /usr/share/doc/Cygwin/cygserver.README for details.
Finally, on February 09, cygipc was updated to happily cooexist with the
cygserver implementation.
</end history lesson>
So, get Cygwin 1.5.7 or newer and read its docs listed above.