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Tom Lane fe35c0b6e5 Fix potential corruption of lock table in CREATE/DROP INDEX CONCURRENTLY. 
If VirtualXactLock() has to wait for a transaction that holds its VXID lock
as a fast-path lock, it must first convert the fast-path lock to a regular
lock.  It failed to take the required "partition" lock on the main
shared-memory lock table while doing so.  This is the direct cause of the
assert failure in GetLockStatusData() recently observed in the buildfarm,
but more worryingly it could result in arbitrary corruption of the shared
lock table if some other process were concurrently engaged in modifying the
same partition of the lock table.  Fortunately, VirtualXactLock() is only
used by CREATE INDEX CONCURRENTLY and DROP INDEX CONCURRENTLY, so the
opportunities for failure are fewer than they might have been.

In passing, improve some comments and be a bit more consistent about
order of operations.
2013-01-08 18:26:03 -05:00
config Put back AC_REQUIRE([AC_STRUCT_TM]). 2012-05-14 23:06:48 -04:00
contrib Prevent creation of postmaster's TCP socket during pg_upgrade testing. 2013-01-03 18:34:57 -05:00
doc Invent a "one-shot" variant of CachedPlans for better performance. 2013-01-04 17:42:25 -05:00
src Fix potential corruption of lock table in CREATE/DROP INDEX CONCURRENTLY. 2013-01-08 18:26:03 -05:00
.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 Ignore libedit/libreadline while probing for standard functions. 2012-12-18 16:22:19 -05:00
configure.in Ignore libedit/libreadline while probing for standard functions. 2012-12-18 16:22:19 -05:00
COPYRIGHT Update copyrights for 2013 2013-01-01 17:15:00 -05:00
GNUmakefile.in Add isolation test to check-world and installcheck-world 2012-03-05 20:19:20 +02:00
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/.