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Re: Posix Shared Mem patch

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Magnus Hagander <magnus(at)hagander(dot)net>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Posix Shared Mem patch
Date: 2012-06-28 14:11:31
Message-ID: 11577.1340892691@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
... 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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