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Tom Lane 1192ba8b67 Avoid potential deadlock in InitCatCachePhase2(). 
Opening a catcache's index could require reading from that cache's own
catalog, which of course would acquire AccessShareLock on the catalog.
So the original coding here risks locking index before heap, which could
deadlock against another backend trying to get exclusive locks in the
normal order.  Because InitCatCachePhase2 is only called when a backend
has to start up without a relcache init file, the deadlock was seldom seen
in the field.  (And by the same token, there's no need to worry about any
performance disadvantage; so not much point in trying to distinguish
exactly which catalogs have the risk.)

Bug report, diagnosis, and patch by Nikhil Sontakke.  Additional commentary
by me.  Back-patch to all supported branches.
2011-03-22 13:00:48 -04:00
config Better support for thread-support flag detection with clang 2011-02-16 23:15:54 +02:00
contrib Remove unused copy_dir() function from pg_upgrade. 2011-03-15 20:52:35 -04:00
doc Update docs to say you need fsync to make sync rep work fast. 2011-03-22 16:23:54 +00:00
src Avoid potential deadlock in InitCatCachePhase2(). 2011-03-22 13:00:48 -04:00
.gitignore Ignore files built by coverage builds 2011-03-08 22:10:00 +02:00
aclocal.m4
configure Support for DragonFly BSD 2011-03-02 21:15:28 +02:00
configure.in Support for DragonFly BSD 2011-03-02 21:15:28 +02:00
COPYRIGHT Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
GNUmakefile.in Allow make check in PL directories 2011-02-15 06:52:12 +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/.