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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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3
src/backend/utils/misc/postgresql.conf.sample
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@ -120,7 +120,7 @@
#max_files_per_process = 1000 # min 25
# (change requires restart)
#preload_libraries = '' # (change requires restart)
#shared_preload_libraries = '' # (change requires restart)
# - Cost-Based Vacuum Delay -
@ -419,6 +419,7 @@
#explain_pretty_print = on
#dynamic_library_path = '$libdir'
#local_preload_libraries = ''
#---------------------------------------------------------------------------