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Thomas Munro a722252ef1 Back-patch b1ffe3ff into REL_13_STABLE. 
This is a cherry pick of 4c8e00ae from the 14 branch into the 13 branch.

It avoids an assertion failure when ForwardSyncRequest() tries to
allocate memory while trying to compact the queue, if run in a critical
section.  RelationTruncate() gained a critical section in 38c579b0, and
could fail in that way in the 13 branch.

b1ffe3ff originally fixed the same problem with TruncateMultiXact(), but
for that case it only needed to go back as far as 14, where SLRUs
started using the sync request queue.  It also fixed a related deadlock
risk that doesn't apply in this case (this case doesn't wait), but it
might exist in theory and it doesn't hurt to keep the code the same as
later branches.

Author: Heikki Linnakangas <heikki.linnakangas@iki.fi> (original commit)
Reviewed-by: Michael Paquier <michael@paquier.xyz> (in this new context)
Reported-by: Yura Sokolov <y.sokolov@postgrespro.ru>
Discussion: https://postgr.es/m/f98aaa79-80b5-47c9-832a-31416a3a528b%40postgrespro.ru
2025-01-09 10:14:11 +13:00
config Log LLVM library version in configure output. 2023-10-22 14:32:31 +13:00
contrib Restore smgrtruncate() prototype in back-branches. 2025-01-08 10:48:57 +13:00
doc Document strange jsonb sort order for empty top level arrays 2025-01-03 10:29:18 -05:00
src Back-patch b1ffe3ff into REL_13_STABLE. 2025-01-09 10:14:11 +13:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Backpatch addition of .git-blame-ignore-revs 2022-08-05 19:36:24 +02:00
.gitattributes Exclude LLVM files from whitespace checks 2024-11-27 11:10:42 +01:00
.gitignore Add portlock directory to .gitignore 2022-11-26 07:47:16 -05:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure If a C23 compiler is detected, try asking for C17. 2024-11-27 15:52:15 +13:00
configure.in If a C23 compiler is detected, try asking for C17. 2024-11-27 15:52:15 +13:00
COPYRIGHT Update copyright for 2025 2025-01-01 11:21:54 -05:00
GNUmakefile.in Remove temporary portlock directory during make [dist]clean. 2022-11-26 10:30:58 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
meson.build Disable clang 16's -Wcast-function-type-strict. 2024-11-08 09:44:01 +10:30
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00

README 

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.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

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