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Add server support for "plugin" libraries that can be used for add-on tasks

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such as debugging and performance measurement.  This consists of two features:
a table of "rendezvous variables" that allows separately-loaded shared
libraries to communicate, and a new GUC setting "local_preload_libraries"
that allows libraries to be loaded into specific sessions without explicit
cooperation from the client application.  To make local_preload_libraries
as flexible as possible, we do not restrict its use to superusers; instead,
it is restricted to load only libraries stored in $libdir/plugins/.  The
existing LOAD command has also been modified to allow non-superusers to
LOAD libraries stored in this directory.

This patch also renames the existing GUC variable preload_libraries to
shared_preload_libraries (after a suggestion by Simon Riggs) and does some
code refactoring in dfmgr.c to improve clarity.

Korry Douglas, with a little help from Tom Lane.
This commit is contained in:
Tom Lane
2006-08-15 18:26:59 +00:00
parent 66541c5aa5
commit abc3120e9b
11 changed files with 353 additions and 113 deletions
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8
src/backend/tcop/postgres.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.498 2006/08/13 22:18:08 tgl Exp $
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.499 2006/08/15 18:26:58 tgl Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -3000,6 +3000,12 @@ PostgresMain(int argc, char *argv[], const char *username)
if (IsUnderPostmaster && Log_disconnections)
on_proc_exit(log_disconnections, 0);
/*
* process any libraries that should be preloaded at backend start
* (this likewise can't be done until GUC settings are complete)
*/
process_local_preload_libraries();
/*
* Send this backend's cancellation info to the frontend.
*/