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Add session_preload_libraries configuration parameter

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This is like shared_preload_libraries except that it takes effect at
backend start and can be changed without a full postmaster restart.  It
is like local_preload_libraries except that it is still only settable by
a superuser.  This can be a better way to load modules such as
auto_explain.

Since there are now three preload parameters, regroup the documentation
a bit.  Put all parameters into one section, explain common
functionality only once, update the descriptions to reflect current and
future realities.

Reviewed-by: Dimitri Fontaine <dimitri@2ndQuadrant.fr>
This commit is contained in:
Peter Eisentraut
2013-06-12 22:28:24 -04:00
parent f3ab5d4696
commit 070518ddab
7 changed files with 193 additions and 124 deletions
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6
src/backend/utils/init/miscinit.c
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@ -1222,6 +1222,7 @@ ValidatePgVersion(const char *path)
* GUC variables: lists of library names to be preloaded at postmaster
* start and at backend start
*/
char *session_preload_libraries_string = NULL;
char *shared_preload_libraries_string = NULL;
char *local_preload_libraries_string = NULL;
@ -1318,8 +1319,11 @@ process_shared_preload_libraries(void)
* process any libraries that should be preloaded at backend start
*/
void
process_local_preload_libraries(void)
process_session_preload_libraries(void)
{
load_libraries(session_preload_libraries_string,
"session_preload_libraries",
false);
load_libraries(local_preload_libraries_string,
"local_preload_libraries",
true);