Re: pg_ctl / SCM interaction

> -----Original Message-----
> From: Andrew Dunstan [mailto:andrew@dunslane.net]
> Sent: 24 May 2004 15:30
> To: pgsql-hackers-win32
> Subject: [pgsql-hackers-win32] pg_ctl / SCM interaction
>
> Ok, help me out a bit here. We start postmaster using the SCM. As I
> understand it, that gives us 2 processes, one (process X)
> that interacts
> with the SCM and one that it creates (process Y) which is the "real"
> postmaster, and the one that writes its id in postmaster.pid.
>
> Now we use pg_ctl restart. It sends, say, TERM to process Y.
> I presume
> process X notices that Process Y has gone away, and registers
> that the
> service is stopped. Then pg_ctl starts another postmaster. How does
> process X know that the new postmaster is its replacement process for
> process X?

It doesn't. I was chatting to Magnus earlier suggesting an integrated
solution rather than a wrapper. The more I think about it the more I
think this is the only way to be certain that the service code is
singing from the same hymnsheet as the postmaster.

/D