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Michael Paquier b85f9c00fb Make StandbyAcquireAccessExclusiveLock() more resilent with OOMs 
In StandbyReleaseXidEntryLocks, a failure in acquiring a lock with
LockAcquire() due to an out-of-memory problem would lead to an
inconsistency with the lock state cached in the startup process,
impacting the list of RecoveryLockXidEntrys.  The code is updated here
so as the cached state is updated once the lock is acquired.

This problem is unlikely going to happen in practice.  Even if it were
to show up, it would translate to a LOG message for non-assert builds
(assertion failure otherwise), so no backpatch is done.  This commit is
in the same spirit as 29fb598b9c, with a problem emulated by injecting
random failures for allocations.

Reported-by: Alexander Lakhin <exclusion@gmail.com>
Author: Matthias van de Meent <boekewurm+postgres@gmail.com>
Discussion: https://postgr.es/m/e77acaac-a1b3-40b3-99ee-5769b4e453e4@gmail.com
2026-06-20 15:00:40 +09:00
.github ci: Improve ccache handling 2026-06-08 15:26:47 -04:00
config Update config.guess and config.sub 2026-04-09 11:26:14 +02:00
contrib hstore_plperl: Add CHECK_FOR_INTERRUPTS() in reference-unwinding loop. 2026-06-18 12:23:13 -04:00
doc doc PG 19 relnotes: fix "standard_conforming_strings = off text 2026-06-18 12:19:35 -04:00
src Make StandbyAcquireAccessExclusiveLock() more resilent with OOMs 2026-06-20 15:00:40 +09:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.git-blame-ignore-revs Add previous commit to .git-blame-ignore-revs. 2026-06-04 10:16:21 -05:00
.gitattributes Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
.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 Stamp 19beta1. 2026-06-01 16:02:13 -04:00
configure.ac Stamp 19beta1. 2026-06-01 16:02:13 -04:00
COPYRIGHT Update copyright for 2026 2026-01-01 13:24:10 -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 Restore AIX support. 2026-02-23 13:34:22 -05:00
meson.build Stamp 19beta1. 2026-06-01 16:02:13 -04:00
meson_options.txt Revert "Add built-in fuzzing harnesses for security testing." 2026-04-10 09:53:58 -04:00
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/.