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Formerly, the memory used to represent a PL/Tcl function was allocated with malloc() or in TopMemoryContext, and we'd leak it all if the function got redefined during the session. Instead, create a per-function context and keep everything in or under that context. Add a reference-counting mechanism (like the one plpgsql has long had) so that we can safely clean up an old function definition, either immediately if it's not being executed or at the end of the outermost execution. Currently, we only detect that a cached function is obsolete when we next attempt to call that function. So this covers the updated-definition case but leaves cruft around after DROP FUNCTION. It's not clear whether it's worth installing a syscache invalidation callback to watch for drops; none of the other PLs do, so for now we won't do it here either. Michael Paquier and Tom Lane Discussion: <CAB7nPqSOyAsHC6jL24J1B+oK3p=yyNoFU0Vs_B6fd2kdd5g5WQ@mail.gmail.com> |
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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. 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/.