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Tom Lane 71b9549d05 Overdue code review for transaction-level advisory locks patch. Commit `62c7bd31c8` had assorted problems, most visibly that it broke PREPARE TRANSACTION in the presence of session-level advisory locks (which should be ignored by PREPARE), as per a recent complaint from Stephen Rees. More abstractly, the patch made the LockMethodData.transactional flag not merely useless but outright dangerous, because in point of fact that flag no longer tells you anything at all about whether a lock is held transactionally. This fix therefore removes that flag altogether. We now rely entirely on the convention already in use in lock.c that transactional lock holds must be owned by some ResourceOwner, while session holds are never so owned. Setting the locallock struct's owner link to NULL thus denotes a session hold, and there is no redundant marker for that. PREPARE TRANSACTION now works again when there are session-level advisory locks, and it is also able to transfer transactional advisory locks to the prepared transaction, but for implementation reasons it throws an error if we hold both types of lock on a single lockable object. Perhaps it will be worth improving that someday. Assorted other minor cleanup and documentation editing, as well. Back-patch to 9.1, except that in the 9.1 branch I did not remove the LockMethodData.transactional flag for fear of causing an ABI break for any external code that might be examining those structs.		2012-05-04 17:44:31 -04:00
config	Fix configure's search for collateindex.pl.	2012-03-22 00:46:03 -04:00
contrib	Even more duplicate word removal, in the spirit of the season	2012-05-02 20:56:03 +03:00
doc	Overdue code review for transaction-level advisory locks patch.	2012-05-04 17:44:31 -04:00
src	Overdue code review for transaction-level advisory locks patch.	2012-05-04 17:44:31 -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	Remove BSD/OS (BSDi) port. There are no known users upgrading to	2012-05-03 10:58:44 -04:00
configure.in	Remove BSD/OS (BSDi) port. There are no known users upgrading to	2012-05-03 10:58:44 -04:00
COPYRIGHT	Update copyright notices for year 2012.	2012-01-01 18:01:58 -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/.