From: | Claudio Natoli <claudio(dot)natoli(at)memetrics(dot)com> |
---|---|
To: | 'Tom Lane' <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Claudio Natoli <claudio(dot)natoli(at)memetrics(dot)com> |
Cc: | "'pgsql-hackers(at)postgresql(dot)org'" <pgsql-hackers(at)postgresql(dot)org>, 'PostgreSQL Win32 port list' <pgsql-hackers-win32(at)postgresql(dot)org> |
Subject: | Re: [HACKERS] fork/exec problem: DynaHashCxt |
Date: | 2003-12-03 04:48:42 |
Message-ID: | A02DEC4D1073D611BAE8525405FCCE2B028065@harris.memetrics.local |
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Thread: | |
Lists: | pgsql-hackers pgsql-hackers-win32 |
> I'm not sure if you're confusing backend-local hashes with shared
> hashes, or hash control headers with the actual shared data. But
> the above is a false statement. DynaHashCxt is not shared.
No, wasn't confused over that. Was confused over something else though :-)
> Shared hashes are a bit tricky because there is a backend-local
> structure that has a pointer into the shared memory --- is that
> what's confusing you?
That's pretty much right on the mark, and the heart of the problem I
suspect.
So this means we'll have to pull relHash out of the shared FreeSpaceMap
structure and make it a variable in it's own right? [Same goes for lockHash
and proclockHash in the LockMethod structure reference by "LockTable (lock
method table)"]
> Keep in mind that this code did work in a fork/exec context not
> so many moons ago. If you think you see a showstopper, it's a
> relatively recent change and can be undone.
Keeping this firmly in mind, trust me.
Thanks,
Claudio
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