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Tom Lane 2bdf1b2a2e Reserve a PGPROC slot and semaphore for the slotsync worker process. 
The need for this was missed in commit 93db6cbda, with the result
being that if we launch a slotsync worker it would consume one of
the PGPROCs in the max_connections pool.  That could lead to inability
to launch the worker, or to subsequent failures of connection requests
that should have succeeded according to the configured settings.

Rather than create some one-off infrastructure to support this,
let's group the slotsync worker with the existing autovac launcher
in a new category of "special worker" processes.  These are kind of
like auxiliary processes, but they cannot use that infrastructure
because they need to be able to run transactions.

For the moment, make these processes share the PGPROC freelist
used for autovac workers (which previously supplied the autovac
launcher too).  This is partly to avoid an ABI change in v17,
and partly because it seems silly to have a freelist with
at most two members.  This might be worth revisiting if we grow
enough workers in this category.

Tom Lane and Hou Zhijie.  Back-patch to v17.

Discussion: https://postgr.es/m/1808397.1735156190@sss.pgh.pa.us
2024-12-28 12:30:42 -05:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Use <stdint.h> and <inttypes.h> for c.h integers. 2024-12-04 15:05:38 +13:00
contrib Partial pgindent of .l and .y files 2024-12-25 17:55:42 +01:00
doc Try to avoid semaphore-related test failures on NetBSD/OpenBSD. 2024-12-23 16:46:24 -05:00
src Reserve a PGPROC slot and semaphore for the slotsync worker process. 2024-12-28 12:30:42 -05:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml ci: Fix cached MacPorts installation management 2024-11-27 11:51:54 -05:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
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.mailmap Add a Git .mailmap file 2024-11-05 13:56:02 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Use <stdint.h> and <inttypes.h> for c.h integers. 2024-12-04 15:05:38 +13:00
configure.ac Use <stdint.h> and <inttypes.h> for c.h integers. 2024-12-04 15:05:38 +13:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:05 -05:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Remove AIX support 2024-02-28 15:17:23 +04:00
meson.build Use <stdint.h> and <inttypes.h> for c.h integers. 2024-12-04 15:05:38 +13:00
meson_options.txt Make PG_TEST_EXTRA env var override the "meson setup" option 2024-11-04 14:09:25 +02:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

README.md

PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.