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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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2
src/backend/tcop/postgres.c
View File

@@ -3743,7 +3743,7 @@ PostgresMain(int argc, char *argv[],
* 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();
process_session_preload_libraries();
/*
* Send this backend's cancellation info to the frontend.

6
src/backend/utils/init/miscinit.c
View File

@@ -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);

19
src/backend/utils/misc/guc.c
View File

@@ -591,6 +591,8 @@ const char *const config_group_names[] =
gettext_noop("Client Connection Defaults / Statement Behavior"),
/* CLIENT_CONN_LOCALE */
gettext_noop("Client Connection Defaults / Locale and Formatting"),
/* CLIENT_CONN_PRELOAD */
gettext_noop("Client Connection Defaults / Shared Library Preloading"),
/* CLIENT_CONN_OTHER */
gettext_noop("Client Connection Defaults / Other Defaults"),
/* LOCK_MANAGEMENT */
@@ -2770,7 +2772,18 @@ static struct config_string ConfigureNamesString[] =
},
{
{"shared_preload_libraries", PGC_POSTMASTER, RESOURCES_KERNEL,
{"session_preload_libraries", PGC_SUSET, CLIENT_CONN_PRELOAD,
gettext_noop("Lists shared libraries to preload into each backend."),
NULL,
GUC_LIST_INPUT | GUC_LIST_QUOTE | GUC_SUPERUSER_ONLY
},
&session_preload_libraries_string,
"",
NULL, NULL, NULL
},
{
{"shared_preload_libraries", PGC_POSTMASTER, CLIENT_CONN_PRELOAD,
gettext_noop("Lists shared libraries to preload into server."),
NULL,
GUC_LIST_INPUT | GUC_LIST_QUOTE | GUC_SUPERUSER_ONLY
@@ -2781,8 +2794,8 @@ static struct config_string ConfigureNamesString[] =
},
{
{"local_preload_libraries", PGC_BACKEND, CLIENT_CONN_OTHER,
gettext_noop("Lists shared libraries to preload into each backend."),
{"local_preload_libraries", PGC_BACKEND, CLIENT_CONN_PRELOAD,
gettext_noop("Lists unprivileged shared libraries to preload into each backend."),
NULL,
GUC_LIST_INPUT | GUC_LIST_QUOTE
},

3
src/include/miscadmin.h
View File

@@ -403,6 +403,7 @@ extern void BaseInit(void);
/* in utils/init/miscinit.c */
extern bool IgnoreSystemIndexes;
extern PGDLLIMPORT bool process_shared_preload_libraries_in_progress;
extern char *session_preload_libraries_string;
extern char *shared_preload_libraries_string;
extern char *local_preload_libraries_string;
@@ -438,7 +439,7 @@ extern void TouchSocketLockFiles(void);
extern void AddToDataDirLockFile(int target_line, const char *str);
extern void ValidatePgVersion(const char *path);
extern void process_shared_preload_libraries(void);
extern void process_local_preload_libraries(void);
extern void process_session_preload_libraries(void);
extern void pg_bindtextdomain(const char *domain);
extern bool has_rolreplication(Oid roleid);

1
src/include/utils/guc_tables.h
View File

@@ -88,6 +88,7 @@ enum config_group
CLIENT_CONN,
CLIENT_CONN_STATEMENT,
CLIENT_CONN_LOCALE,
CLIENT_CONN_PRELOAD,
CLIENT_CONN_OTHER,
LOCK_MANAGEMENT,
COMPAT_OPTIONS,