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authorTom Lane <tgl@sss.pgh.pa.us>2000-11-16 22:30:52 +0000
committerTom Lane <tgl@sss.pgh.pa.us>2000-11-16 22:30:52 +0000
commita933ee38bbb8dffbc48a3363a94ff6f2a9f7964d (patch)
tree1c32737389b2530e7152dc2287161b36d9001e8c /src/backend/access/index/istrat.c
parentcff23842a4c68301ddf34559c7af383bb5557054 (diff)
downloadpostgresql-a933ee38bbb8dffbc48a3363a94ff6f2a9f7964d.tar.gz
postgresql-a933ee38bbb8dffbc48a3363a94ff6f2a9f7964d.zip
Change SearchSysCache coding conventions so that a reference count is
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.
Diffstat (limited to 'src/backend/access/index/istrat.c')
-rw-r--r--src/backend/access/index/istrat.c61
1 files changed, 32 insertions, 29 deletions
diff --git a/src/backend/access/index/istrat.c b/src/backend/access/index/istrat.c
index d6a966bcd44..681b80e1e86 100644
--- a/src/backend/access/index/istrat.c
+++ b/src/backend/access/index/istrat.c
@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/index/Attic/istrat.c,v 1.46 2000/07/14 22:17:30 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/index/Attic/istrat.c,v 1.47 2000/11/16 22:30:16 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -482,9 +482,9 @@ OperatorRelationFillScanKeyEntry(Relation operatorRelation,
if (cachesearch)
{
- tuple = SearchSysCacheTuple(OPEROID,
- ObjectIdGetDatum(operatorObjectId),
- 0, 0, 0);
+ tuple = SearchSysCache(OPEROID,
+ ObjectIdGetDatum(operatorObjectId),
+ 0, 0, 0);
}
else
{
@@ -505,24 +505,25 @@ OperatorRelationFillScanKeyEntry(Relation operatorRelation,
{
if (!cachesearch)
heap_endscan(scan);
- elog(ERROR, "OperatorObjectIdFillScanKeyEntry: unknown operator %u",
+ elog(ERROR, "OperatorRelationFillScanKeyEntry: unknown operator %u",
operatorObjectId);
}
entry->sk_flags = 0;
entry->sk_procedure = ((Form_pg_operator) GETSTRUCT(tuple))->oprcode;
- fmgr_info(entry->sk_procedure, &entry->sk_func);
- entry->sk_nargs = entry->sk_func.fn_nargs;
- if (!cachesearch)
+ if (cachesearch)
+ ReleaseSysCache(tuple);
+ else
heap_endscan(scan);
if (!RegProcedureIsValid(entry->sk_procedure))
- {
elog(ERROR,
- "OperatorObjectIdFillScanKeyEntry: no procedure for operator %u",
+ "OperatorRelationFillScanKeyEntry: no procedure for operator %u",
operatorObjectId);
- }
+
+ fmgr_info(entry->sk_procedure, &entry->sk_func);
+ entry->sk_nargs = entry->sk_func.fn_nargs;
}
@@ -547,16 +548,16 @@ IndexSupportInitialize(IndexStrategy indexStrategy,
HeapTuple tuple;
Form_pg_index iform;
StrategyMap map;
- AttrNumber attributeNumber;
- int attributeIndex;
+ AttrNumber attNumber;
+ int attIndex;
Oid operatorClassObjectId[INDEX_MAX_KEYS];
bool cachesearch = (!IsBootstrapProcessingMode()) && IsCacheInitialized();
if (cachesearch)
{
- tuple = SearchSysCacheTuple(INDEXRELID,
- ObjectIdGetDatum(indexObjectId),
- 0, 0, 0);
+ tuple = SearchSysCache(INDEXRELID,
+ ObjectIdGetDatum(indexObjectId),
+ 0, 0, 0);
}
else
{
@@ -583,19 +584,23 @@ IndexSupportInitialize(IndexStrategy indexStrategy,
* XXX note that the following assumes the INDEX tuple is well formed
* and that the *key and *class are 0 terminated.
*/
- for (attributeIndex = 0; attributeIndex < maxAttributeNumber; attributeIndex++)
+ for (attIndex = 0; attIndex < maxAttributeNumber; attIndex++)
{
- if (!OidIsValid(iform->indkey[attributeIndex]))
+ if (!OidIsValid(iform->indkey[attIndex]))
{
- if (attributeIndex == InvalidAttrNumber)
+ if (attIndex == InvalidAttrNumber)
elog(ERROR, "IndexSupportInitialize: no pg_index tuple");
break;
}
- operatorClassObjectId[attributeIndex] = iform->indclass[attributeIndex];
+ operatorClassObjectId[attIndex] = iform->indclass[attIndex];
}
- if (!cachesearch)
+ if (cachesearch)
+ {
+ ReleaseSysCache(tuple);
+ }
+ else
{
heap_endscan(scan);
heap_close(relation, AccessShareLock);
@@ -614,20 +619,19 @@ IndexSupportInitialize(IndexStrategy indexStrategy,
relation = heap_openr(AccessMethodProcedureRelationName,
AccessShareLock);
- for (attributeNumber = 1; attributeNumber <= maxAttributeNumber;
- attributeNumber++)
+ for (attNumber = 1; attNumber <= maxAttributeNumber; attNumber++)
{
int16 support;
Form_pg_amproc aform;
RegProcedure *loc;
- loc = &indexSupport[((attributeNumber - 1) * maxSupportNumber)];
+ loc = &indexSupport[((attNumber - 1) * maxSupportNumber)];
for (support = 0; support < maxSupportNumber; ++support)
loc[support] = InvalidOid;
entry[1].sk_argument =
- ObjectIdGetDatum(operatorClassObjectId[attributeNumber - 1]);
+ ObjectIdGetDatum(operatorClassObjectId[attNumber - 1]);
scan = heap_beginscan(relation, false, SnapshotNow, 2, entry);
@@ -654,17 +658,16 @@ IndexSupportInitialize(IndexStrategy indexStrategy,
relation = heap_openr(AccessMethodOperatorRelationName, AccessShareLock);
operatorRelation = heap_openr(OperatorRelationName, AccessShareLock);
- for (attributeNumber = maxAttributeNumber; attributeNumber > 0;
- attributeNumber--)
+ for (attNumber = maxAttributeNumber; attNumber > 0; attNumber--)
{
StrategyNumber strategy;
entry[1].sk_argument =
- ObjectIdGetDatum(operatorClassObjectId[attributeNumber - 1]);
+ ObjectIdGetDatum(operatorClassObjectId[attNumber - 1]);
map = IndexStrategyGetStrategyMap(indexStrategy,
maxStrategyNumber,
- attributeNumber);
+ attNumber);
for (strategy = 1; strategy <= maxStrategyNumber; strategy++)
ScanKeyEntrySetIllegal(StrategyMapGetScanKeyEntry(map, strategy));