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Tom Lane cce7486127 Fix race condition in DELETE RETURNING. 
When RETURNING is specified, ExecDelete would return a virtual-tuple slot
that could contain pointers into an already-unpinned disk buffer.  Another
process could change the buffer contents before we get around to using the
data, resulting in garbage results or even a crash.  This seems of fairly
low probability, which may explain why there are no known field reports of
the problem, but it's definitely possible.  Fix by forcing the result slot
to be "materialized" before we release pin on the disk buffer.

Back-patch to 9.0; in earlier branches there is no bug because
ExecProcessReturning sent the tuple to the destination immediately.  Also,
this is already fixed in HEAD as part of the writable-foreign-tables patch
(where the fix is necessary for DELETE RETURNING to work at all with
postgres_fdw).
2013-03-10 19:18:49 -04:00
config Don't reject threaded Python on FreeBSD. 2012-02-20 16:21:35 -05:00
contrib Fix contrib/pg_trgm's similarity() function for trigram-free strings. 2013-02-13 14:07:17 -05:00
doc doc: Awkward phrasing fix 2013-03-03 08:52:34 -05:00
src Fix race condition in DELETE RETURNING. 2013-03-10 19:18:49 -04:00
.gitignore Add gitignore for mingw/cygwin build outputs 2011-06-09 18:11:47 +02:00
aclocal.m4 Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
configure Stamp 9.1.8. 2013-02-04 16:28:27 -05:00
configure.in Stamp 9.1.8. 2013-02-04 16:28:27 -05:00
COPYRIGHT Update copyrights for 2013 2013-01-01 17:15:00 -05:00
GNUmakefile.in Build src/ before contrib/ in make world 2011-08-24 21:36:53 +03:00
Makefile Allow make check in PL directories 2011-02-15 06:52:12 +02:00
README Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
README.git Trivial typo fix. 2010-09-21 14:16:00 -04:00

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:

	http://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.  Changes between all PostgreSQL releases are recorded in the
file HISTORY.  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
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.