Horton

Re: make MaxBackends available in _PG_init

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Andres Freund <andres@anarazel.de>
Cc: "Bossart, Nathan" <bossartn@amazon.com>, Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>, "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>
Date: 2021-08-03T15:25:29Z
Lists: pgsql-hackers 
On Mon, Aug 2, 2021 at 4:37 PM Andres Freund <andres@anarazel.de> wrote:
> I'm not so sure it's a good idea. I've seen several shared_preload_library
> using extensions that adjust some GUCs (e.g. max_prepared_transactions)
> because they need some more resources internally - that's perhaps not a great
> idea, but there's also not an obviously better way.

Blech.

I'm fine with solving the problem some other way, but I say again, blech.

-- 
Robert Haas
EDB: http://www.enterprisedb.com

Commits

  1. Add a new shmem_request_hook hook.

  2. Remove non-functional code for unloading loadable modules.

  3. Fix misleading comments about background worker registration.

  4. Revert the addition of GetMaxBackends() and related stuff.

  5. Fix typo in multixact.c

  6. Reduce more the number of calls to GetMaxBackends()

  7. Remove MaxBackends variable in favor of GetMaxBackends() function.

  8. Fix comments about bgworker registration before MaxBackends initialization

  9. Fix bogus assertion in BootstrapModeMain().

  10. Make sure MaxBackends is always set