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called before, not after, calling the assign_hook if any. This is because push_old_value might fail (due to palloc out-of-memory), and in that case there would be no stack entry to tell transaction abort to undo the GUC assignment. Of course the actual assignment to the GUC variable hasn't happened yet --- but the assign_hook might have altered subsidiary state. Without a stack entry we won't call it again to make it undo such actions. So this is necessary to make the world safe for assign_hooks with side effects. Per a discussion a couple weeks ago with Magnus. Back-patch to 8.0. 7.x did not have the problem because it did not have allocatable stacks of GUC values. |
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| contrib | ||
| doc | ||
| src | ||
| aclocal.m4 | ||
| configure | ||
| configure.in | ||
| COPYRIGHT | ||
| GNUmakefile.in | ||
| Makefile | ||
| README | ||
| README.CVS | ||
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/.