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On immediate shutdown, or during a restart-after-crash sequence, postmaster used to send SIGQUIT (and then abandon ship if shutdown); but this is not a good strategy if backends don't die because of that signal. (This might happen, for example, if a backend gets tangled trying to malloc() due to gettext(), as in an example illustrated by MauMau.) This causes problems when later trying to restart the server, because some processes are still attached to the shared memory segment. Instead of just abandoning such backends to their fates, we now have postmaster hang around for a little while longer, send a SIGKILL after some reasonable waiting period, and then exit. This makes immediate shutdown more reliable. There is disagreement on whether it's best for postmaster to exit after sending SIGKILL, or to stick around until all children have reported death. If this controversy is resolved differently than what this patch implements, it's an easy change to make. Bug reported by MauMau in message 20DAEA8949EC4E2289C6E8E58560DEC0@maumau MauMau and Álvaro Herrera |
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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/.