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Tom Lane 491dd4a97d Fix relcache reload mechanism to be more robust in the face of errors 
occurring during a reload, such as query-cancel.  Instead of zeroing out
an existing relcache entry and rebuilding it in place, build a new relcache
entry, then swap its contents with the old one, then free the new entry.
This avoids problems with code believing that a previously obtained pointer
to a cache entry must still reference a valid entry, as seen in recent
failures on buildfarm member jaguar.  (jaguar is using CLOBBER_CACHE_ALWAYS
which raises the probability of failure substantially, but the problem
could occur in the field without that.)  The previous design was okay
when it was made, but subtransactions and the ResourceOwner mechanism
make it unsafe now.

Also, make more use of the already existing rd_isvalid flag, so that we
remember that the entry requires rebuilding even if the first attempt fails.

Back-patch as far as 8.2.  Prior versions have enough issues around relcache
reload anyway (due to inadequate locking) that fixing this one doesn't seem
worthwhile.
2010-01-12 18:12:18 +00:00
config Make configure check the version of Perl we're building with, and reject 2010-01-07 01:41:11 +00:00
contrib Add some simple support and documentation for using process-specific oom_adj 2010-01-11 18:39:32 +00:00
doc Remove tabs in SGML file. 2010-01-12 02:33:45 +00:00
src Fix relcache reload mechanism to be more robust in the face of errors 2010-01-12 18:12:18 +00:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure Fail in a nicer way if we have --with-perl and no Perl. 2010-01-07 03:24:57 +00:00
configure.in Fail in a nicer way if we have --with-perl and no Perl. 2010-01-07 03:24:57 +00:00
COPYRIGHT Update copyright for the year 2010. 2010-01-02 16:58:17 +00:00
GNUmakefile.in Build bzip2 tarball in dist target as well 2009-11-03 21:28:10 +00:00
Makefile Revert brainfart: Of course the wildcard only works in GNU make itself. 2009-12-23 19:42:15 +00:00
README Point to our download URL, rather than listing interface in the README 2008-05-06 22:02:12 +00:00
README.CVS Fix the makefiles to fail cleanly if Perl is needed but not present. This 2009-06-23 03:46:00 +00:00

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/.