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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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4
src/backend/postmaster/postmaster.c
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@ -37,7 +37,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.498 2006/08/08 19:15:07 tgl Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.499 2006/08/15 18:26:58 tgl Exp $
*
* NOTES
*
@ -709,7 +709,7 @@ PostmasterMain(int argc, char *argv[])
/*
* process any libraries that should be preloaded at postmaster start
*/
process_preload_libraries();
process_shared_preload_libraries();
/*
* Remove old temporary files. At this point there can be no other