Re: Accommodate startup process in a separate ProcState array slot instead of in MaxBackends slots.

On Sat, Mar 26, 2022 at 1:20 AM Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>
> On Sat, Feb 12, 2022 at 6:26 AM Bharath Rupireddy
> <bharath(dot)rupireddyforpostgres(at)gmail(dot)com> wrote:
> > FWIW, here's a patch just adding a comment on how the startup process
> > can get a free procState array slot even when SInvalShmemSize hasn't
> > accounted for it.
>
> I don't think the positioning of this code comment is very good,
> because it's commenting on 0 lines of code. Perhaps that problem could
> be fixed by making it the second paragraph of the immediately
> preceding comment instead of a separate block, but I think the right
> place to comment on this sort of thing is actually in the code that
> sizes the data structure - i.e. SInvalShmemSize. If someone looks at
> that function and says "hey, this uses GetMaxBackends(), that's off by
> one!" they are not ever going to find this comment explaining the
> reasoning.

Thanks. It makes sense to put the comment in SInvalShmemSize.
Attaching v2 patch. Please review it.

Regards,
Bharath Rupireddy.