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https://github.com/postgres/postgres.git
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Add a feature for automatic initialization and finalization of dynamically
loaded libraries: call functions _PG_init() and _PG_fini() if the library defines such symbols. Hence we no longer need to specify an initialization function in preload_libraries: we can assume that the library used the _PG_init() convention, instead. This removes one source of pilot error in use of preloaded libraries. Original patch by Ralf Engelschall, preload_libraries changes by me.
This commit is contained in:
Tom Lane
@ -37,7 +37,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.497 2006/07/29 03:02:55 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.498 2006/08/08 19:15:07 tgl Exp $
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*
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* NOTES
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*
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@ -197,9 +197,6 @@ bool Db_user_namespace = false;
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char *bonjour_name;
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/* list of library:init-function to be preloaded */
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char *preload_libraries_string = NULL;
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/* PIDs of special child processes; 0 when not running */
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static pid_t StartupPID = 0,
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BgWriterPID = 0,
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@ -710,11 +707,9 @@ PostmasterMain(int argc, char *argv[])
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#endif
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/*
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* process any libraries that should be preloaded and optionally
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* pre-initialized
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* process any libraries that should be preloaded at postmaster start
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*/
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if (preload_libraries_string)
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process_preload_libraries(preload_libraries_string);
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process_preload_libraries();
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/*
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* Remove old temporary files. At this point there can be no other
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/fmgr/dfmgr.c,v 1.86 2006/06/07 22:24:44 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/utils/fmgr/dfmgr.c,v 1.87 2006/08/08 19:15:08 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -25,6 +25,10 @@
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#include "utils/dynamic_loader.h"
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/* signatures for PostgreSQL-specific library init/fini functions */
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typedef void (*PG_init_t)(void);
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typedef void (*PG_fini_t)(void);
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/*
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* List of dynamically loaded files (kept in malloc'd memory).
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*/
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@ -79,7 +83,7 @@ static const Pg_magic_struct magic_data = PG_MODULE_MAGIC_DATA;
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* identifying the library file. The filehandle can be used with
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* lookup_external_function to lookup additional functions in the same file
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* at less cost than repeating load_external_function.
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*/
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*/
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PGFunction
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load_external_function(char *filename, char *funcname,
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bool signalNotFound, void **filehandle)
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@ -90,6 +94,7 @@ load_external_function(char *filename, char *funcname,
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char *load_error;
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struct stat stat_buf;
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char *fullname;
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PG_init_t PG_init;
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fullname = expand_dynamic_library_name(filename);
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if (!fullname)
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@ -201,7 +206,14 @@ load_external_function(char *filename, char *funcname,
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fullname),
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errhint("Extension libraries are now required to use the PG_MODULE_MAGIC macro.")));
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}
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/*
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* If the library has a _PG_init() function, call it.
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*/
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PG_init = (PG_init_t) pg_dlsym(file_scanner->handle, "_PG_init");
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if (PG_init)
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(*PG_init)();
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/* OK to link it into list */
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if (file_list == NULL)
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file_list = file_scanner;
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@ -248,6 +260,7 @@ load_file(char *filename)
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*nxt;
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struct stat stat_buf;
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char *fullname;
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PG_fini_t PG_fini;
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fullname = expand_dynamic_library_name(filename);
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if (!fullname)
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@ -280,6 +293,14 @@ load_file(char *filename)
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else
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file_list = nxt;
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clear_external_function_hash(file_scanner->handle);
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/*
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* If the library has a _PG_fini() function, call it.
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*/
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PG_fini = (PG_fini_t) pg_dlsym(file_scanner->handle, "_PG_fini");
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if (PG_fini)
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(*PG_fini)();
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pg_dlclose(file_scanner->handle);
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free((char *) file_scanner);
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/* prv does not change */
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/init/miscinit.c,v 1.155 2006/07/14 14:52:25 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/utils/init/miscinit.c,v 1.156 2006/08/08 19:15:08 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -1097,14 +1097,14 @@ ValidatePgVersion(const char *path)
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*-------------------------------------------------------------------------
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*/
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typedef void (*func_ptr) ();
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/* GUC variable: list of library names to be preloaded */
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char *preload_libraries_string = NULL;
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/*
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* process any libraries that should be preloaded and
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* optionally pre-initialized
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* process any libraries that should be preloaded at postmaster start
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*/
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void
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process_preload_libraries(char *preload_libraries_string)
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process_preload_libraries(void)
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{
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char *rawstring;
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List *elemlist;
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@ -1131,54 +1131,14 @@ process_preload_libraries(char *preload_libraries_string)
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foreach(l, elemlist)
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{
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char *tok = (char *) lfirst(l);
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char *sep = strstr(tok, ":");
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char *filename = NULL;
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char *funcname = NULL;
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func_ptr initfunc;
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if (sep)
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{
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/*
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* a colon separator implies there is an initialization function
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* that we need to run in addition to loading the library
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*/
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size_t filename_len = sep - tok;
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size_t funcname_len = strlen(tok) - filename_len - 1;
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filename = (char *) palloc(filename_len + 1);
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memcpy(filename, tok, filename_len);
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filename[filename_len] = '\0';
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funcname = (char *) palloc(funcname_len + 1);
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strcpy(funcname, sep + 1);
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}
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else
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{
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/*
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* no separator -- just load the library
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*/
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filename = pstrdup(tok);
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funcname = NULL;
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}
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char *filename;
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filename = pstrdup(tok);
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canonicalize_path(filename);
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initfunc = (func_ptr) load_external_function(filename, funcname,
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true, NULL);
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if (initfunc)
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(*initfunc) ();
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if (funcname)
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ereport(LOG,
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(errmsg("preloaded library \"%s\" with initialization function \"%s\"",
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filename, funcname)));
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else
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ereport(LOG,
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(errmsg("preloaded library \"%s\"",
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filename)));
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(void) load_external_function(filename, NULL, true, NULL);
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ereport(LOG,
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(errmsg("preloaded library \"%s\"", filename)));
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pfree(filename);
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if (funcname)
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pfree(funcname);
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}
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pfree(rawstring);
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@ -13,7 +13,7 @@
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* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.186 2006/03/05 15:58:53 momjian Exp $
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* $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.187 2006/08/08 19:15:08 tgl Exp $
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*
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* NOTES
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* some of the information in this file should be moved to other files.
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@ -307,6 +307,8 @@ extern void BaseInit(void);
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/* in utils/init/miscinit.c */
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extern bool IgnoreSystemIndexes;
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extern char *preload_libraries_string;
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extern void SetReindexProcessing(Oid heapOid, Oid indexOid);
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extern void ResetReindexProcessing(void);
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extern bool ReindexIsProcessingHeap(Oid heapOid);
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@ -317,6 +319,6 @@ extern void TouchSocketLockFile(void);
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extern void RecordSharedMemoryInLockFile(unsigned long id1,
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unsigned long id2);
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extern void ValidatePgVersion(const char *path);
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extern void process_preload_libraries(char *preload_libraries_string);
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extern void process_preload_libraries(void);
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#endif /* MISCADMIN_H */
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@ -6,7 +6,7 @@
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* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/postmaster/postmaster.h,v 1.13 2006/03/05 15:58:58 momjian Exp $
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* $PostgreSQL: pgsql/src/include/postmaster/postmaster.h,v 1.14 2006/08/08 19:15:09 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -25,7 +25,6 @@ extern char *ListenAddresses;
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extern bool ClientAuthInProgress;
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extern int PreAuthDelay;
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extern int AuthenticationTimeout;
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extern char *preload_libraries_string;
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extern bool Log_connections;
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extern bool log_hostname;
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extern char *bonjour_name;
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@ -1,7 +1,7 @@
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/**********************************************************************
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* plperl.c - perl as a procedural language for PostgreSQL
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*
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* $PostgreSQL: pgsql/src/pl/plperl/plperl.c,v 1.112 2006/06/16 18:42:23 tgl Exp $
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* $PostgreSQL: pgsql/src/pl/plperl/plperl.c,v 1.113 2006/08/08 19:15:09 tgl Exp $
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*
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**********************************************************************/
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@ -87,7 +87,6 @@ typedef struct plperl_query_desc
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/**********************************************************************
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* Global data
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**********************************************************************/
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static bool plperl_firstcall = true;
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static bool plperl_safe_init_done = false;
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static PerlInterpreter *plperl_interp = NULL;
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static HV *plperl_proc_hash = NULL;
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@ -101,12 +100,11 @@ static plperl_call_data *current_call_data = NULL;
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/**********************************************************************
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* Forward declarations
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**********************************************************************/
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static void plperl_init_all(void);
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static void plperl_init_interp(void);
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Datum plperl_call_handler(PG_FUNCTION_ARGS);
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Datum plperl_validator(PG_FUNCTION_ARGS);
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void plperl_init(void);
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void _PG_init(void);
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static void plperl_init_interp(void);
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static Datum plperl_func_handler(PG_FUNCTION_ARGS);
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@ -135,16 +133,21 @@ perm_fmgr_info(Oid functionId, FmgrInfo *finfo)
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}
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/* Perform initialization during postmaster startup. */
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/*
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* _PG_init() - library load-time initialization
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*
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* DO NOT make this static nor change its name!
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*/
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void
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plperl_init(void)
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_PG_init(void)
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{
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if (!plperl_firstcall)
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/* Be sure we do initialization only once (should be redundant now) */
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static bool inited = false;
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if (inited)
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return;
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DefineCustomBoolVariable(
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"plperl.use_strict",
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DefineCustomBoolVariable("plperl.use_strict",
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"If true, will compile trusted and untrusted perl code in strict mode",
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NULL,
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&plperl_use_strict,
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@ -154,19 +157,8 @@ plperl_init(void)
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EmitWarningsOnPlaceholders("plperl");
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plperl_init_interp();
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plperl_firstcall = false;
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}
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/* Perform initialization during backend startup. */
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static void
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plperl_init_all(void)
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{
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if (plperl_firstcall)
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plperl_init();
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/* We don't need to do anything yet when a new backend starts. */
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inited = true;
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}
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/* Each of these macros must represent a single string literal */
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@ -657,8 +649,6 @@ plperl_call_handler(PG_FUNCTION_ARGS)
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Datum retval;
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plperl_call_data *save_call_data;
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plperl_init_all();
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save_call_data = current_call_data;
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PG_TRY();
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{
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@ -741,11 +731,7 @@ plperl_validator(PG_FUNCTION_ARGS)
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/* Postpone body checks if !check_function_bodies */
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if (check_function_bodies)
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{
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plperl_proc_desc *prodesc;
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plperl_init_all();
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prodesc = compile_plperl_function(funcoid, istrigger);
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(void) compile_plperl_function(funcoid, istrigger);
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}
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/* the result of a validator is ignored */
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@ -8,7 +8,7 @@
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*
|
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*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_handler.c,v 1.29 2006/05/30 22:12:16 tgl Exp $
|
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* $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_handler.c,v 1.30 2006/08/08 19:15:09 tgl Exp $
|
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*
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*-------------------------------------------------------------------------
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*/
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@ -28,41 +28,25 @@ extern DLLIMPORT bool check_function_bodies;
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|
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PG_MODULE_MAGIC;
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static bool plpgsql_firstcall = true;
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|
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static void plpgsql_init_all(void);
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|
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|
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/*
|
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* plpgsql_init() - postmaster-startup safe initialization
|
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* _PG_init() - library load-time initialization
|
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*
|
||||
* DO NOT make this static --- it has to be callable by preload
|
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* DO NOT make this static nor change its name!
|
||||
*/
|
||||
void
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plpgsql_init(void)
|
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_PG_init(void)
|
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{
|
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/* Do initialization only once */
|
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if (!plpgsql_firstcall)
|
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/* Be sure we do initialization only once (should be redundant now) */
|
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static bool inited = false;
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|
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if (inited)
|
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return;
|
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|
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plpgsql_HashTableInit();
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RegisterXactCallback(plpgsql_xact_cb, NULL);
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plpgsql_firstcall = false;
|
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}
|
||||
|
||||
/*
|
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* plpgsql_init_all() - Initialize all
|
||||
*/
|
||||
static void
|
||||
plpgsql_init_all(void)
|
||||
{
|
||||
/* Execute any postmaster-startup safe initialization */
|
||||
plpgsql_init();
|
||||
|
||||
/*
|
||||
* Any other initialization that must be done each time a new backend
|
||||
* starts -- currently none
|
||||
*/
|
||||
inited = true;
|
||||
}
|
||||
|
||||
/* ----------
|
||||
@ -81,9 +65,6 @@ plpgsql_call_handler(PG_FUNCTION_ARGS)
|
||||
Datum retval;
|
||||
int rc;
|
||||
|
||||
/* perform initialization */
|
||||
plpgsql_init_all();
|
||||
|
||||
/*
|
||||
* Connect to SPI manager
|
||||
*/
|
||||
@ -135,9 +116,6 @@ plpgsql_validator(PG_FUNCTION_ARGS)
|
||||
bool istrigger = false;
|
||||
int i;
|
||||
|
||||
/* perform initialization */
|
||||
plpgsql_init_all();
|
||||
|
||||
/* Get the new function's pg_proc entry */
|
||||
tuple = SearchSysCache(PROCOID,
|
||||
ObjectIdGetDatum(funcoid),
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/pl/plpgsql/src/plpgsql.h,v 1.77 2006/07/11 17:26:59 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/pl/plpgsql/src/plpgsql.h,v 1.78 2006/08/08 19:15:09 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -678,7 +678,7 @@ extern void plpgsql_compile_error_callback(void *arg);
|
||||
* Functions in pl_handler.c
|
||||
* ----------
|
||||
*/
|
||||
extern void plpgsql_init(void);
|
||||
extern void _PG_init(void);
|
||||
extern Datum plpgsql_call_handler(PG_FUNCTION_ARGS);
|
||||
extern Datum plpgsql_validator(PG_FUNCTION_ARGS);
|
||||
|
||||
|
||||
@ -1,7 +1,7 @@
|
||||
/**********************************************************************
|
||||
* plpython.c - python as a procedural language for PostgreSQL
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.84 2006/07/06 01:55:51 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.85 2006/08/08 19:15:09 tgl Exp $
|
||||
*
|
||||
*********************************************************************
|
||||
*/
|
||||
@ -155,11 +155,11 @@ typedef struct PLyResultObject
|
||||
/* function declarations */
|
||||
|
||||
/* Two exported functions: first is the magic telling Postgresql
|
||||
* what function call interface it implements. Second allows
|
||||
* preinitialization of the interpreter during postmaster startup.
|
||||
* what function call interface it implements. Second is for
|
||||
* initialization of the interpreter during library load.
|
||||
*/
|
||||
Datum plpython_call_handler(PG_FUNCTION_ARGS);
|
||||
void plpython_init(void);
|
||||
void _PG_init(void);
|
||||
|
||||
PG_FUNCTION_INFO_V1(plpython_call_handler);
|
||||
|
||||
@ -169,7 +169,6 @@ PG_FUNCTION_INFO_V1(plpython_call_handler);
|
||||
* of plpython_call_handler. initialize the python interpreter
|
||||
* and global data.
|
||||
*/
|
||||
static void PLy_init_all(void);
|
||||
static void PLy_init_interp(void);
|
||||
static void PLy_init_plpy(void);
|
||||
|
||||
@ -233,9 +232,6 @@ static PyObject *PLyLong_FromString(const char *);
|
||||
static PyObject *PLyString_FromString(const char *);
|
||||
|
||||
|
||||
/* global data */
|
||||
static bool PLy_first_call = true;
|
||||
|
||||
/*
|
||||
* Currently active plpython function
|
||||
*/
|
||||
@ -301,8 +297,6 @@ plpython_call_handler(PG_FUNCTION_ARGS)
|
||||
PLyProcedure *save_curr_proc;
|
||||
PLyProcedure *volatile proc = NULL;
|
||||
|
||||
PLy_init_all();
|
||||
|
||||
if (SPI_connect() != SPI_OK_CONNECT)
|
||||
elog(ERROR, "could not connect to SPI manager");
|
||||
|
||||
@ -2263,25 +2257,19 @@ PLy_spi_execute_fetch_result(SPITupleTable *tuptable, int rows, int status)
|
||||
*/
|
||||
|
||||
/*
|
||||
* plpython_init() - Initialize everything that can be
|
||||
* safely initialized during postmaster
|
||||
* startup.
|
||||
* _PG_init() - library load-time initialization
|
||||
*
|
||||
* DO NOT make this static --- it has to be callable by preload
|
||||
* DO NOT make this static nor change its name!
|
||||
*/
|
||||
void
|
||||
plpython_init(void)
|
||||
_PG_init(void)
|
||||
{
|
||||
static volatile bool init_active = false;
|
||||
/* Be sure we do initialization only once (should be redundant now) */
|
||||
static bool inited = false;
|
||||
|
||||
/* Do initialization only once */
|
||||
if (!PLy_first_call)
|
||||
if (inited)
|
||||
return;
|
||||
|
||||
if (init_active)
|
||||
elog(FATAL, "initialization of language module failed");
|
||||
init_active = true;
|
||||
|
||||
Py_Initialize();
|
||||
PLy_init_interp();
|
||||
PLy_init_plpy();
|
||||
@ -2291,20 +2279,7 @@ plpython_init(void)
|
||||
if (PLy_procedure_cache == NULL)
|
||||
PLy_elog(ERROR, "could not create procedure cache");
|
||||
|
||||
PLy_first_call = false;
|
||||
}
|
||||
|
||||
static void
|
||||
PLy_init_all(void)
|
||||
{
|
||||
/* Execute postmaster-startup safe initialization */
|
||||
if (PLy_first_call)
|
||||
plpython_init();
|
||||
|
||||
/*
|
||||
* Any other initialization that must be done each time a new backend
|
||||
* starts -- currently none
|
||||
*/
|
||||
inited = true;
|
||||
}
|
||||
|
||||
static void
|
||||
|
||||
@ -2,7 +2,7 @@
|
||||
* pltcl.c - PostgreSQL support for Tcl as
|
||||
* procedural language (PL)
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/pl/tcl/pltcl.c,v 1.105 2006/06/16 18:42:24 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/pl/tcl/pltcl.c,v 1.106 2006/08/08 19:15:09 tgl Exp $
|
||||
*
|
||||
**********************************************************************/
|
||||
|
||||
@ -120,14 +120,13 @@ static pltcl_proc_desc *pltcl_current_prodesc = NULL;
|
||||
/**********************************************************************
|
||||
* Forward declarations
|
||||
**********************************************************************/
|
||||
static void pltcl_init_all(void);
|
||||
static void pltcl_init_interp(Tcl_Interp *interp);
|
||||
|
||||
static void pltcl_init_load_unknown(Tcl_Interp *interp);
|
||||
|
||||
Datum pltcl_call_handler(PG_FUNCTION_ARGS);
|
||||
Datum pltclu_call_handler(PG_FUNCTION_ARGS);
|
||||
void pltcl_init(void);
|
||||
void _PG_init(void);
|
||||
|
||||
static void pltcl_init_all(void);
|
||||
static void pltcl_init_interp(Tcl_Interp *interp);
|
||||
static void pltcl_init_load_unknown(Tcl_Interp *interp);
|
||||
|
||||
static Datum pltcl_func_handler(PG_FUNCTION_ARGS);
|
||||
|
||||
@ -182,17 +181,15 @@ perm_fmgr_info(Oid functionId, FmgrInfo *finfo)
|
||||
fmgr_info_cxt(functionId, finfo, TopMemoryContext);
|
||||
}
|
||||
|
||||
/**********************************************************************
|
||||
* pltcl_init() - Initialize all that's safe to do in the postmaster
|
||||
/*
|
||||
* _PG_init() - library load-time initialization
|
||||
*
|
||||
* DO NOT make this static --- it has to be callable by preload
|
||||
**********************************************************************/
|
||||
* DO NOT make this static nor change its name!
|
||||
*/
|
||||
void
|
||||
pltcl_init(void)
|
||||
_PG_init(void)
|
||||
{
|
||||
/************************************************************
|
||||
* Do initialization only once
|
||||
************************************************************/
|
||||
/* Be sure we do initialization only once (should be redundant now) */
|
||||
if (pltcl_pm_init_done)
|
||||
return;
|
||||
|
||||
@ -236,20 +233,15 @@ pltcl_init(void)
|
||||
|
||||
/**********************************************************************
|
||||
* pltcl_init_all() - Initialize all
|
||||
*
|
||||
* This does initialization that can't be done in the postmaster, and
|
||||
* hence is not safe to do at library load time.
|
||||
**********************************************************************/
|
||||
static void
|
||||
pltcl_init_all(void)
|
||||
{
|
||||
/************************************************************
|
||||
* Execute postmaster-startup safe initialization
|
||||
************************************************************/
|
||||
if (!pltcl_pm_init_done)
|
||||
pltcl_init();
|
||||
|
||||
/************************************************************
|
||||
* Any other initialization that must be done each time a new
|
||||
* backend starts:
|
||||
* - Try to load the unknown procedure from pltcl_modules
|
||||
* Try to load the unknown procedure from pltcl_modules
|
||||
************************************************************/
|
||||
if (!pltcl_be_init_done)
|
||||
{
|
||||
|
||||
Reference in New Issue
Block a user