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Thomas Munro e656657f2b Fix RBM_ZERO_AND_LOCK. 
Commit 210622c6 accidentally zeroed out pages even if they were found in
the buffer pool.  It should always lock the page, but it should only
zero pages that were not already valid.  Otherwise, concurrent readers
that hold only a pin could see corrupted page contents changing under
their feet.

While here, rename ZeroAndLockBuffer() to match the RBM_ flag name.
Also restore a some useful comments lost by 210622c6's refactoring, and
add some new ones to clarify why we need to use the BM_IO_IN_PROGRESS
infrastructure despite not doing I/O.

Reported-by: Noah Misch <noah@leadboat.com>
Reported-by: Alexander Lakhin <exclusion@gmail.com>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org> (earlier version)
Reviewed-by: Robert Haas <robertmhaas@gmail.com> (earlier version)
Discussion: https://postgr.es/m/20240512171658.7e.nmisch@google.com
Discussion: https://postgr.es/m/7ed10231-ce47-03d5-d3f9-4aea0dc7d5a4%40gmail.com
2024-06-10 12:32:59 +12:00
config jit: Remove {llvm-config,clang}-N configure probes. 2024-05-16 13:58:25 +12:00
contrib postgres_fdw: Refuse to send FETCH FIRST WITH TIES to remote servers. 2024-06-07 17:45:00 +09:00
doc Fix behavior of stable functions called from a CALL's argument list. 2024-06-07 13:27:26 -04:00
src Fix RBM_ZERO_AND_LOCK. 2024-06-10 12:32:59 +12:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml ci: windows: Use the same image for VS and MinGW tasks 2024-06-03 19:06:50 -07:00
.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
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add da256a4a7 to .git-blame-ignore-revs. 2024-05-14 16:37:22 -04:00
.gitattributes Remove non-existing file from .gitattributes 2024-02-16 11:39:09 +01:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Stamp 17beta1. 2024-05-20 17:42:50 -04:00
configure.ac Stamp 17beta1. 2024-05-20 17:42:50 -04:00
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 meson: Restore implicit warning/debug/optimize flags for extensions 2024-06-07 09:36:26 +02:00
meson_options.txt Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -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/.