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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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16
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.341 2006/08/14 02:27:26 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.342 2006/08/15 18:26:59 tgl Exp $
*
*--------------------------------------------------------------------
*/
@ -1964,12 +1964,22 @@ static struct config_string ConfigureNamesString[] =
},
{
{"preload_libraries", PGC_POSTMASTER, RESOURCES_KERNEL,
{"shared_preload_libraries", PGC_POSTMASTER, RESOURCES_KERNEL,
gettext_noop("Lists shared libraries to preload into server."),
NULL,
GUC_LIST_INPUT | GUC_LIST_QUOTE | GUC_SUPERUSER_ONLY
},
&preload_libraries_string,
&shared_preload_libraries_string,
"", NULL, NULL
},
{
{"local_preload_libraries", PGC_BACKEND, CLIENT_CONN_OTHER,
gettext_noop("Lists shared libraries to preload into each backend."),
NULL,
GUC_LIST_INPUT | GUC_LIST_QUOTE
},
&local_preload_libraries_string,
"", NULL, NULL
},