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Tom Lane 7db285afc9 Fix stale-pointer problem in fast-path locking logic.
When acquiring a lock in fast-path mode, we must reset the locallock
object's lock and proclock fields to NULL.  They are not necessarily that
way to start with, because the locallock could be left over from a failed
lock acquisition attempt earlier in the transaction.  Failure to do this
led to all sorts of interesting misbehaviors when LockRelease tried to
clean up no-longer-related lock and proclock objects in shared memory.
Per report from Dan Wood.

In passing, modify LockRelease to elog not just Assert if it doesn't find
lock and proclock objects for a formerly fast-path lock, matching the code
in FastPathGetRelationLockEntry and LockRefindAndRelease.  This isn't a
bug but it will help in diagnosing any future bugs in this area.

Also, modify FastPathTransferRelationLocks and FastPathGetRelationLockEntry
to break out of their loops over the fastpath array once they've found the
sole matching entry.  This was inconsistently done in some search loops
and not others.

Improve assorted related comments, too.

Back-patch to 9.2 where the fast-path mechanism was introduced.
2013-11-27 18:10:00 -05:00
config Remove maintainer-check target, fold into normal build 2013-10-10 20:11:56 -04:00
contrib Defend against bad trigger definitions in contrib/lo's lo_manage() trigger. 2013-11-23 22:46:43 -05:00
doc Minor correction of READ COMMITTED isolation level docs. 2013-11-27 14:34:12 -06:00
src Fix stale-pointer problem in fast-path locking logic. 2013-11-27 18:10:00 -05:00
.dir-locals.el
.gitattributes gitattributes: Make syntax compatible with older Git versions 2013-11-12 21:58:46 -05:00
.gitignore Add *.pot to .gitignore 2013-10-19 10:56:52 -04:00
aclocal.m4
configure Get rid of use of asprintf() in favor of a more portable implementation. 2013-10-22 18:42:13 -04:00
configure.in Fix whitespace issues found by git diff --check, add gitattributes 2013-11-10 14:48:29 -05:00
COPYRIGHT
GNUmakefile.in Remove maintainer-check target, fold into normal build 2013-10-10 20:11:56 -04:00
Makefile
README
README.git Fix doc links in README file to work with new website layout 2013-11-12 12:53:32 +01:00

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/.