database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-15 03:41:20 +03:00
Code Activity

Mega-commit to make heap_open/heap_openr/heap_close take an

Browse Source 
additional argument specifying the kind of lock to acquire/release (or
'NoLock' to do no lock processing).  Ensure that all relations are locked
with some appropriate lock level before being examined --- this ensures
that relevant shared-inval messages have been processed and should prevent
problems caused by concurrent VACUUM.  Fix several bugs having to do with
mismatched increment/decrement of relation ref count and mismatched
heap_open/close (which amounts to the same thing).  A bogus ref count on
a relation doesn't matter much *unless* a SI Inval message happens to
arrive at the wrong time, which is probably why we got away with this
sloppiness for so long.  Repair missing grab of AccessExclusiveLock in
DROP TABLE, ALTER/RENAME TABLE, etc, as noted by Hiroshi.
Recommend 'make clean all' after pulling this update; I modified the
Relation struct layout slightly.
Will post further discussion to pghackers list shortly.
This commit is contained in:
Tom Lane
1999-09-18 19:08:25 +00:00
parent 6c86fd5ba4
commit bd272cace6
70 changed files with 1094 additions and 1215 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
src/backend/utils/fmgr/dfmgr.c
View File

@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/fmgr/dfmgr.c,v 1.31 1999/07/17 20:18:04 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/fmgr/dfmgr.c,v 1.32 1999/09/18 19:08:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -56,8 +56,13 @@ fmgr_dynamic(Oid procedureId, int *pronargs)
/*
* The procedure isn't a builtin, so we'll have to do a catalog lookup
* to find its pg_proc entry.
* to find its pg_proc entry. Moreover, since probin is varlena, we're
* going to have to use heap_getattr, which means we need the reldesc,
* which means we need to open the relation. So we might as well do that
* first and get the benefit of SI inval if needed.
*/
rel = heap_openr(ProcedureRelationName, AccessShareLock);
procedureTuple = SearchSysCacheTuple(PROOID,
ObjectIdGetDatum(procedureId),
0, 0, 0);
@@ -71,36 +76,24 @@ fmgr_dynamic(Oid procedureId, int *pronargs)
procedureStruct = (Form_pg_proc) GETSTRUCT(procedureTuple);
proname = procedureStruct->proname.data;
pronargs_save = *pronargs = procedureStruct->pronargs;
/*
* Extract the procedure info from the pg_proc tuple. Since probin is
* varlena, do a amgetattr() on the procedure tuple. To do that, we
* need the rel for the procedure relation, so...
*/
/* open pg_procedure */
rel = heap_openr(ProcedureRelationName);
if (!RelationIsValid(rel))
{
elog(ERROR, "fmgr: Could not open relation %s",
ProcedureRelationName);
return (func_ptr) NULL;
}
probinattr = heap_getattr(procedureTuple,
Anum_pg_proc_probin,
RelationGetDescr(rel), &isnull);
if (!PointerIsValid(probinattr) /* || isnull */ )
{
heap_close(rel);
heap_close(rel, AccessShareLock);
elog(ERROR, "fmgr: Could not extract probin for %u from %s",
procedureId, ProcedureRelationName);
return (func_ptr) NULL;
}
probinstring = textout((struct varlena *) probinattr);
heap_close(rel, AccessShareLock);
user_fn = handle_load(probinstring, proname);
pfree(probinstring);
procedureId_save = procedureId;
user_fn_save = user_fn;