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38628db8d8
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Fujii Masao 38628db8d8 Add memory barriers for PgBackendStatus.st_changecount protocol. 
st_changecount protocol needs the memory barriers to ensure that
the apparent order of execution is as it desires. Otherwise,
for example, the CPU might rearrange the code so that st_changecount
is incremented twice before the modification on a machine with
weak memory ordering. This surprising result can lead to bugs.

This commit introduces the macros to load and store st_changecount
with the memory barriers. These are called before and after
PgBackendStatus entries are modified or copied into private memory,
in order to prevent CPU from reordering PgBackendStatus access.

Per discussion on pgsql-hackers, we decided not to back-patch this
to 9.4 or before until we get an actual bug report about this.

Patch by me. Review by Robert Haas.
2014-12-18 23:07:51 +09:00
config Detect PG_PRINTF_ATTRIBUTE automatically. 2014-11-23 09:34:03 -05:00
contrib Lock down regression testing temporary clusters on Windows. 2014-12-17 22:48:40 -05:00
doc Lock down regression testing temporary clusters on Windows. 2014-12-17 22:48:40 -05:00
src Add memory barriers for PgBackendStatus.st_changecount protocol. 2014-12-18 23:07:51 +09:00
.dir-locals.el
.gitattributes Add functions for dealing with PGP armor header lines to pgcrypto. 2014-10-01 16:03:39 +03:00
.gitignore Update .gitignore for config.cache. 2014-12-18 19:56:42 +09:00
aclocal.m4
configure Detect PG_PRINTF_ATTRIBUTE automatically. 2014-11-23 09:34:03 -05:00
configure.in Detect PG_PRINTF_ATTRIBUTE automatically. 2014-11-23 09:34:03 -05:00
COPYRIGHT
GNUmakefile.in Add TAP tests for client programs 2014-04-14 21:33:46 -04:00
HISTORY Improve text of stub HISTORY file. 2014-02-12 18:16:17 -05:00
Makefile
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/.