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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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8
src/include/miscadmin.h
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@ -13,7 +13,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.187 2006/08/08 19:15:08 tgl Exp $
* $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.188 2006/08/15 18:26:59 tgl Exp $
*
* NOTES
* some of the information in this file should be moved to other files.
@ -307,7 +307,8 @@ extern void BaseInit(void);
/* in utils/init/miscinit.c */
extern bool IgnoreSystemIndexes;
extern char *preload_libraries_string;
extern char *shared_preload_libraries_string;
extern char *local_preload_libraries_string;
extern void SetReindexProcessing(Oid heapOid, Oid indexOid);
extern void ResetReindexProcessing(void);
@ -319,6 +320,7 @@ extern void TouchSocketLockFile(void);
extern void RecordSharedMemoryInLockFile(unsigned long id1,
unsigned long id2);
extern void ValidatePgVersion(const char *path);
extern void process_preload_libraries(void);
extern void process_shared_preload_libraries(void);
extern void process_local_preload_libraries(void);
#endif /* MISCADMIN_H */