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Change SearchSysCache coding conventions so that a reference count is

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maintained for each cache entry.  A cache entry will not be freed until
the matching ReleaseSysCache call has been executed.  This eliminates
worries about cache entries getting dropped while still in use.  See
my posting to pg-hackers of even date for more info.
This commit is contained in:
Tom Lane
2000-11-16 22:30:52 +00:00
parent cff23842a4
commit a933ee38bb
95 changed files with 2672 additions and 2314 deletions
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64
src/backend/parser/parse_func.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.93 2000/11/11 19:49:26 thomas Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.94 2000/11/16 22:30:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -354,19 +354,19 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
CandidateList candidates;
/* try for exact match first... */
if (SearchSysCacheTuple(AGGNAME,
PointerGetDatum(funcname),
ObjectIdGetDatum(basetype),
0, 0))
if (SearchSysCacheExists(AGGNAME,
PointerGetDatum(funcname),
ObjectIdGetDatum(basetype),
0, 0))
return (Node *) ParseAgg(pstate, funcname, basetype,
fargs, agg_star, agg_distinct,
precedence);
/* check for aggregate-that-accepts-any-type (eg, COUNT) */
if (SearchSysCacheTuple(AGGNAME,
PointerGetDatum(funcname),
ObjectIdGetDatum(0),
0, 0))
if (SearchSysCacheExists(AGGNAME,
PointerGetDatum(funcname),
ObjectIdGetDatum(0),
0, 0))
return (Node *) ParseAgg(pstate, funcname, 0,
fargs, agg_star, agg_distinct,
precedence);
@ -450,7 +450,7 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
if (rte->relname == NULL)
elog(ERROR,
"function applied to tuple is not supported for subSELECTs");
toid = typeTypeId(typenameType(rte->relname));
toid = typenameTypeId(rte->relname);
/* replace it in the arg list */
lfirst(i) = makeVar(vnum, 0, toid, -1, sublevels_up);
@ -531,15 +531,14 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
*/
if (nargs == 1)
{
Type tp;
Oid targetType;
tp = SearchSysCacheTuple(TYPENAME,
PointerGetDatum(funcname),
0, 0, 0);
if (HeapTupleIsValid(tp))
targetType = GetSysCacheOid(TYPENAME,
PointerGetDatum(funcname),
0, 0, 0);
if (OidIsValid(targetType))
{
Oid sourceType = oid_array[0];
Oid targetType = typeTypeId(tp);
Node *arg1 = lfirst(fargs);
if ((sourceType == UNKNOWNOID && IsA(arg1, Const)) ||
@ -573,6 +572,7 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
if (typeTypeFlag(tp) == 'c')
elog(ERROR, "No such attribute or function '%s'",
funcname);
ReleaseSysCache(tp);
}
/* Else generate a detailed complaint */
@ -1037,11 +1037,11 @@ func_get_detail(char *funcname,
HeapTuple ftup;
/* attempt to find with arguments exactly as specified... */
ftup = SearchSysCacheTuple(PROCNAME,
PointerGetDatum(funcname),
Int32GetDatum(nargs),
PointerGetDatum(argtypes),
0);
ftup = SearchSysCache(PROCNAME,
PointerGetDatum(funcname),
Int32GetDatum(nargs),
PointerGetDatum(argtypes),
0);
if (HeapTupleIsValid(ftup))
{
@ -1085,11 +1085,11 @@ func_get_detail(char *funcname,
if (ncandidates == 1)
{
*true_typeids = current_function_typeids->args;
ftup = SearchSysCacheTuple(PROCNAME,
PointerGetDatum(funcname),
Int32GetDatum(nargs),
ftup = SearchSysCache(PROCNAME,
PointerGetDatum(funcname),
Int32GetDatum(nargs),
PointerGetDatum(*true_typeids),
0);
0);
Assert(HeapTupleIsValid(ftup));
break;
}
@ -1107,12 +1107,13 @@ func_get_detail(char *funcname,
if (*true_typeids != NULL)
{
/* was able to choose a best candidate */
ftup = SearchSysCacheTuple(PROCNAME,
PointerGetDatum(funcname),
Int32GetDatum(nargs),
PointerGetDatum(*true_typeids),
0);
ftup = SearchSysCache(PROCNAME,
PointerGetDatum(funcname),
Int32GetDatum(nargs),
PointerGetDatum(*true_typeids),
0);
Assert(HeapTupleIsValid(ftup));
break;
}
/*
@ -1143,6 +1144,7 @@ func_get_detail(char *funcname,
*funcid = ftup->t_data->t_oid;
*rettype = pform->prorettype;
*retset = pform->proretset;
ReleaseSysCache(ftup);
return true;
}
return false;
@ -1284,7 +1286,7 @@ find_inheritors(Oid relid, Oid **supervec)
relid = lfirsti(elt);
rd = heap_open(relid, NoLock);
trelid = typeTypeId(typenameType(RelationGetRelationName(rd)));
trelid = typenameTypeId(RelationGetRelationName(rd));
heap_close(rd, NoLock);
*relidvec++ = trelid;
}