Re: GUC patch for Win32

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.

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