From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
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To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | PostgreSQL-patches <pgsql-patches(at)postgresql(dot)org> |
Subject: | Re: GUC patch for Win32 |
Date: | 2003-05-02 03:58:18 |
Message-ID: | 200305020358.h423wIb16235@candle.pha.pa.us |
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Lists: | pgsql-patches |
Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > The patch basically writes all modified GUC variables to a binary file
> > that can be read in by newly created exec'ed backends.
>
> Where exactly is the interlock to ensure that the new backend will end up
> with the correct settings if someone is changing the values at about
> the time of the fork?
Postmaster creates a new file, then does rename() to move it to the name
used by the backends. It can't move it until the file is not in use.
> The relcache code has this problem solved, but I'm unconvinced that GUC
> does.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
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