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Andres Freund 1b468a131b Fix the fallback memory barrier implementation to be reentrant. This was essentially "broken" since 0c8eda62; but until more recently (`14e8803f`) barriers usage in signal handlers was infrequent. The failure to be reentrant was noticed because the test_shm_mq, which uses memory barriers at a high frequency, occasionally got stuck on some solaris buildfarm animals. Turns out, those machines use sun studio 12.1, which doesn't yet have efficient memory barrier support. A machine with a newer sun studio did not fail. Forcing the barrier fallback to be used on x86 allows to reproduce the problem. The new fallback is to use kill(PostmasterPid, 0) based on the theory that that'll always imply a barrier due to checking the liveliness of PostmasterPid on systems old enough to need fallback support. It's hard to come up with a good and performant fallback. I'm not backpatching this for now - the problem isn't active in the back branches, and we haven't backpatched barrier changes for now. Additionally master looks entirely different than the back branches due to the new atomics abstraction. It seems better to let this rest in master, where the non-reentrancy actively causes a problem, and then consider backpatching. Found-By: Robert Haas Discussion: 55626265.3060800@dunslane.net		2015-06-26 17:00:38 +02:00
config	Remove configure check prohibiting threaded libpython on OpenBSD.	2015-05-26 22:14:59 -04:00
contrib	Make Python tests more portable	2015-05-31 07:10:45 -04:00
doc	Improve handling of CustomPath/CustomPlan(State) children.	2015-06-26 09:40:47 -04:00
src	Fix the fallback memory barrier implementation to be reentrant.	2015-06-26 17:00:38 +02:00
.dir-locals.el	emacs: Set indent-tabs-mode in perl-mode	2015-04-12 23:53:23 -04:00
.gitattributes	Add functions for dealing with PGP armor header lines to pgcrypto.	2014-10-01 16:03:39 +03:00
.gitignore	Improve speed of make check-world	2015-04-23 08:59:52 -04:00
aclocal.m4
configure	Remove configure check prohibiting threaded libpython on OpenBSD.	2015-05-26 22:14:59 -04:00
configure.in	Windows also needs an override of the shared libpython detection	2015-05-02 13:23:16 -04:00
COPYRIGHT	Update copyright for 2015	2015-01-06 11:43:47 -05:00
GNUmakefile.in	Fix distclean/maintainer-clean targets to remove top-level tmp_install dir.	2015-05-13 18:48:05 -04:00
HISTORY	Improve text of stub HISTORY file.	2014-02-12 18:16:17 -05:00
Makefile	Allow make check in PL directories	2011-02-15 06:52:12 +02:00
README	Don't generate plain-text HISTORY and src/test/regress/README anymore.	2014-02-10 20:48:04 -05:00
README.git	Don't generate plain-text HISTORY and src/test/regress/README anymore.	2014-02-10 20:48:04 -05:00

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.  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/.