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Tom Lane 5b9a058384 Tweak LWLock algorithms so that an awakened waiter for a lock is not granted the lock when awakened; the signal now only means that the lock is potentially available. The waiting process must retry its attempt to get the lock when it gets to run. This allows the lock releasing process to re-acquire the lock later in its timeslice. Since LWLocks are usually held for short periods, it is possible for a process to acquire and release the same lock many times in a timeslice. The old spinlock-based implementation of these locks allowed for that; but the original coding of LWLock would force a process swap for each acquisition if there was any contention. Although this approach reopens the door to process starvation (a waiter might repeatedly fail to get the lock), the odds of that being a big problem seem low, and the performance cost of the previous approach is considerable.		2002-01-07 16:33:00 +00:00
config	Add memcmp() test and new memcmp.c file, for SunOS. Tested by Tatsuo.	2001-12-20 21:23:05 +00:00
contrib	> > On Fri, Dec 21, 2001 at 11:43:21AM +0800, Christopher Kings-Lynne	2002-01-03 07:21:48 +00:00
doc	Editorial review	2002-01-07 02:29:15 +00:00
src	Tweak LWLock algorithms so that an awakened waiter for a lock is not	2002-01-07 16:33:00 +00:00
aclocal.m4	Put the right runpath to libpq into the Perl module shared object on more	2001-08-26 22:28:04 +00:00
configure	Add memcmp() test and new memcmp.c file, for SunOS. Tested by Tatsuo.	2001-12-20 21:23:05 +00:00
configure.in	Add memcmp() test and new memcmp.c file, for SunOS. Tested by Tatsuo.	2001-12-20 21:23:05 +00:00
COPYRIGHT	Better formatting	2001-12-19 18:53:47 +00:00
GNUmakefile.in	/doc/src -> /doc for Peter.	2001-11-21 23:19:25 +00:00
HISTORY	Add mention of PRIMARY in ALTER TABLE ... [ UNIQUE \| PRIMARY ]	2002-01-03 05:37:43 +00:00
INSTALL	Update from source	2001-11-28 20:54:04 +00:00
Makefile	Restructure the key include files per recent pghackers discussion: there	2001-02-10 02:31:31 +00:00
README	New edition	2001-12-19 18:53:58 +00:00
register.txt	Updated URLs.	2001-10-02 14:21:26 +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 several language
bindings, including C, C++, Perl, Python, and Tcl, as well as drivers
for JDBC and ODBC.

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
ftp://ftp.postgresql.org/pub/.  For more information look at our web
site located at http://www.postgresql.org/.