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finish archiving everything (when there's no error), and to eliminate various hazards as best we can. This fixes a previous 8.3 patch that caused the postmaster to kill and then restart the archiver during shutdown (!?). The new behavior is that the archiver is allowed to run unmolested until the bgwriter has exited; then it is sent SIGUSR2 to tell it to do a final archiving cycle and quit. We only SIGQUIT the archiver if we want a panic stop; this is important since SIGQUIT will also be sent to any active archive_command. The postmaster also now doesn't SIGQUIT the stats collector until the bgwriter is done, since the bgwriter can send stats messages in 8.3. The postmaster will not exit until both the archiver and stats collector are gone; this provides some defense (not too bulletproof) against conflicting archiver or stats collector processes being started by a new postmaster instance. We continue the prior practice that the archiver will check for postmaster death immediately before issuing any archive_command; that gives some additional protection against conflicting archivers. Also, modify the archiver process to notice SIGTERM and refuse to issue any more archive commands if it gets it. The postmaster doesn't ever send it SIGTERM; we assume that any such signal came from init and is a notice of impending whole-system shutdown. In this situation it seems imprudent to try to start new archive commands --- if they aren't extremely quick they're likely to get SIGKILL'd by init. All per discussion.
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 including some of the more common listed below: C++ - http://thaiopensource.org/development/libpqxx/ JDBC - http://jdbc.postgresql.org ODBC - http://odbc.postgresql.org Perl - http://search.cpan.org/~dbdpg/ PHP - http://www.php.net Python - http://www.initd.org/ Ruby - http://ruby.scripting.ca/postgres/ Other language binding are available from a variety of contributing parties. PostgreSQL also has a great number of procedural languages available, a short, incomplete list is below: PL/pgSQL - included in PostgreSQL source distribution PL/Perl - included in PostgreSQL source distribution PL/PHP - http://projects.commandprompt.com/projects/public/plphp PL/Python - included in PostgreSQL source distribution PL/Java - http://pgfoundry.org/projects/pljava/ PL/Tcl - included in PostgreSQL source distribution 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/.