database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-19 13:42:17 +03:00
Code Activity

Change SearchSysCache coding conventions so that a reference count is

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

28
src/backend/optimizer/plan/subselect.c
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/subselect.c,v 1.44 2000/10/26 21:36:09 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/subselect.c,v 1.45 2000/11/16 22:30:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -23,7 +23,7 @@
#include "optimizer/subselect.h"
#include "parser/parse_expr.h"
#include "parser/parse_oper.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
Index PlannerQueryLevel; /* level of current query */
@@ -271,8 +271,11 @@ make_subplan(SubLink *slink)
pfree(var); /* var is only needed for new_param */
Assert(IsA(oper, Oper));
tup = get_operator_tuple(oper->opno);
Assert(HeapTupleIsValid(tup));
tup = SearchSysCache(OPEROID,
ObjectIdGetDatum(oper->opno),
0, 0, 0);
if (! HeapTupleIsValid(tup))
elog(ERROR, "cache lookup failed for operator %u", oper->opno);
opform = (Form_pg_operator) GETSTRUCT(tup);
/*
@@ -283,6 +286,8 @@ make_subplan(SubLink *slink)
exprType(lefthand), opform->oprleft);
right = make_operand("", (Node *) prm,
prm->paramtype, opform->oprright);
ReleaseSysCache(tup);
newoper = lappend(newoper,
make_opclause(oper,
(Var *) left,
@@ -401,15 +406,14 @@ make_subplan(SubLink *slink)
Node *left,
*right;
/*
* XXX really ought to fill in constlen and constbyval
* correctly, but right now ExecEvalExpr won't look at them...
*/
con = makeConst(te->resdom->restype, 0, 0, true, 0, 0, 0);
con = makeNullConst(te->resdom->restype);
Assert(IsA(oper, Oper));
tup = get_operator_tuple(oper->opno);
Assert(HeapTupleIsValid(tup));
tup = SearchSysCache(OPEROID,
ObjectIdGetDatum(oper->opno),
0, 0, 0);
if (! HeapTupleIsValid(tup))
elog(ERROR, "cache lookup failed for operator %u", oper->opno);
opform = (Form_pg_operator) GETSTRUCT(tup);
/*
@@ -420,6 +424,8 @@ make_subplan(SubLink *slink)
exprType(lefthand), opform->oprleft);
right = make_operand("", (Node *) con,
con->consttype, opform->oprright);
ReleaseSysCache(tup);
newoper = lappend(newoper,
make_opclause(oper,
(Var *) left,