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Tom Lane 2dc2e4e31a Avoid improbable PANIC during heap_update, redux. 
Commit 34f581c39 intended to ensure that RelationGetBufferForTuple
would acquire a visibility-map page pin in case the otherBuffer's
all-visible bit had become set since we last had lock on that page.
But I missed a case: when we're extending the relation, VM concerns
were dealt with only in the relatively-less-likely case that we
fail to conditionally lock the otherBuffer.  I think I'd believed
that we couldn't need to worry about it if the conditional lock
succeeds, which is true for the target buffer; but the otherBuffer
was unlocked for awhile so its bit might be set anyway.  So we need
to do the GetVisibilityMapPins dance, and then also recheck the
page's free space, in both cases.

Per report from Jaime Casanova.  Back-patch to v12 as the previous
patch was (although there's still no evidence that the bug is
reachable pre-v14).

Discussion: https://postgr.es/m/E1lWLjP-00006Y-Ml@gemulon.postgresql.org
 		2022-09-30 19:37:00 -04:00
config meson: Add initial version of meson based build system 2022-09-21 22:37:17 -07:00
contrib Restore pg_pread and friends. 2022-09-29 13:12:11 +13:00
doc Adjust PQsslAttributeNames() to match PQsslAttribute(). 2022-09-30 10:26:47 -04:00
src Avoid improbable PANIC during heap_update, redux. 2022-09-30 19:37:00 -04:00
.cirrus.yml ci: Add 32bit build and test 2022-09-29 20:32:20 -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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HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
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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/.