Re: make MaxBackends available in _PG_init

Nathan Bossart <nathandbossart@gmail.com> writes:
> I noticed that requests for more LWLocks follow a similar pattern as
> regular shared memory requests, and I figured that we would want to do
> something similar for those, but I wasn't sure exactly how to proceed.  I
> saw two options: 1) use shmem_request_hook for both regular requests and
> LWLock requests or 2) introduce an lwlock_request_hook.  My instinct was
> that option 1 was preferable,

Yeah, I agree, which says that maybe the hook name needs to be something
else (not that I have a good proposal).

> but AFAICT this requires introducing a new
> external variable for inspecting whether the request is made at a valid
> time.

Uh, why?  It'd be the core code's responsibility to place the hook
call at a point where you could do both.

            regards, tom lane