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Chuck,
Thanks to help from Frank Seesink, I was able to finally figure out why cygipc and in turn PostgreSQL failed to work properly under XP in certain situations. See the attached for some of the details.
In summary, invoking the XP Fast User Switching feature causes XP to start using multiple kernel object namespaces instead of a single global one. This in turn causes cygipc clients to fail to find a global semaphore (i.e., \BaseNamedObjects\MultiSemSem_) created by ipc-daemon and abort.
Are you willing to accept a cygipc patch to correct this problem?
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