... btw, I rather imagine that Robert has already noticed this, but OS X
(and presumably other BSDen) spells the flag "MAP_ANON" not
"MAP_ANONYMOUS".  I also find this rather interesting flag there:

     MAP_HASSEMAPHORE  Notify the kernel that the region may contain sema-
                       phores and that special handling may be necessary.

By "semaphore" I suspect they mean "spinlock", so we'd better turn this
flag on where it exists.

			regards, tom lane

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• Re: Posix Shared Mem patch at 2012-06-28 13:59:38 from Tom Lane

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• Re: Posix Shared Mem patch at 2012-06-28 15:26:00 from Robert Haas

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