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Initial MVCC code.

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New code for locking buffer' context.
This commit is contained in:
Vadim B. Mikheev
1998-12-15 12:47:01 +00:00
parent c5a27161a1
commit 3f7fbf85dc
65 changed files with 1391 additions and 1282 deletions
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153
src/backend/commands/trigger.c
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@ -40,7 +40,7 @@ void RelationBuildTriggers(Relation relation);
void FreeTriggerDesc(Relation relation);
static void DescribeTrigger(TriggerDesc *trigdesc, Trigger *trigger);
static HeapTuple GetTupleForTrigger(Relation relation, ItemPointer tid,
static HeapTuple GetTupleForTrigger(EState *estate, ItemPointer tid,
bool before);
extern GlobalMemory CacheCxt;
@ -77,7 +77,7 @@ CreateTrigger(CreateTrigStmt *stmt)
if (!RelationIsValid(rel))
elog(ERROR, "CreateTrigger: there is no relation %s", stmt->relname);
RelationSetLockForWrite(rel);
LockRelation(rel, AccessExclusiveLock);
TRIGGER_CLEAR_TYPE(tgtype);
if (stmt->before)
@ -114,7 +114,7 @@ CreateTrigger(CreateTrigStmt *stmt)
/* Scan pg_trigger */
tgrel = heap_openr(TriggerRelationName);
RelationSetLockForWrite(tgrel);
LockRelation(tgrel, AccessExclusiveLock);
ScanKeyEntryInitialize(&key, 0, Anum_pg_trigger_tgrelid,
F_OIDEQ, RelationGetRelid(rel));
tgscan = heap_beginscan(tgrel, 0, SnapshotNow, 1, &key);
@ -211,7 +211,7 @@ CreateTrigger(CreateTrigStmt *stmt)
CatalogIndexInsert(idescs, Num_pg_trigger_indices, tgrel, tuple);
CatalogCloseIndices(Num_pg_trigger_indices, idescs);
pfree(tuple);
RelationUnsetLockForWrite(tgrel);
UnlockRelation(tgrel, AccessExclusiveLock);
heap_close(tgrel);
pfree(DatumGetPointer(values[Anum_pg_trigger_tgname - 1]));
@ -227,7 +227,7 @@ CreateTrigger(CreateTrigStmt *stmt)
pgrel = heap_openr(RelationRelationName);
((Form_pg_class) GETSTRUCT(tuple))->reltriggers = found + 1;
RelationInvalidateHeapTuple(pgrel, tuple);
heap_replace(pgrel, &tuple->t_self, tuple);
heap_replace(pgrel, &tuple->t_self, tuple, NULL);
CatalogOpenIndices(Num_pg_class_indices, Name_pg_class_indices, ridescs);
CatalogIndexInsert(ridescs, Num_pg_class_indices, pgrel, tuple);
CatalogCloseIndices(Num_pg_class_indices, ridescs);
@ -267,10 +267,10 @@ DropTrigger(DropTrigStmt *stmt)
if (!RelationIsValid(rel))
elog(ERROR, "DropTrigger: there is no relation %s", stmt->relname);
RelationSetLockForWrite(rel);
LockRelation(rel, AccessExclusiveLock);
tgrel = heap_openr(TriggerRelationName);
RelationSetLockForWrite(tgrel);
LockRelation(tgrel, AccessExclusiveLock);
ScanKeyEntryInitialize(&key, 0, Anum_pg_trigger_tgrelid,
F_OIDEQ, RelationGetRelid(rel));
tgscan = heap_beginscan(tgrel, 0, SnapshotNow, 1, &key);
@ -280,7 +280,7 @@ DropTrigger(DropTrigStmt *stmt)
if (namestrcmp(&(pg_trigger->tgname), stmt->trigname) == 0)
{
heap_delete(tgrel, &tuple->t_self);
heap_delete(tgrel, &tuple->t_self, NULL);
tgfound++;
}
else
@ -293,7 +293,7 @@ DropTrigger(DropTrigStmt *stmt)
elog(NOTICE, "DropTrigger: found (and deleted) %d trigger %s on relation %s",
tgfound, stmt->trigname, stmt->relname);
heap_endscan(tgscan);
RelationUnsetLockForWrite(tgrel);
UnlockRelation(tgrel, AccessExclusiveLock);
heap_close(tgrel);
tuple = SearchSysCacheTupleCopy(RELNAME,
@ -306,7 +306,7 @@ DropTrigger(DropTrigStmt *stmt)
pgrel = heap_openr(RelationRelationName);
((Form_pg_class) GETSTRUCT(tuple))->reltriggers = found;
RelationInvalidateHeapTuple(pgrel, tuple);
heap_replace(pgrel, &tuple->t_self, tuple);
heap_replace(pgrel, &tuple->t_self, tuple, NULL);
CatalogOpenIndices(Num_pg_class_indices, Name_pg_class_indices, ridescs);
CatalogIndexInsert(ridescs, Num_pg_class_indices, pgrel, tuple);
CatalogCloseIndices(Num_pg_class_indices, ridescs);
@ -333,17 +333,17 @@ RelationRemoveTriggers(Relation rel)
HeapTuple tup;
tgrel = heap_openr(TriggerRelationName);
RelationSetLockForWrite(tgrel);
LockRelation(tgrel, AccessExclusiveLock);
ScanKeyEntryInitialize(&key, 0, Anum_pg_trigger_tgrelid,
F_OIDEQ, RelationGetRelid(rel));
tgscan = heap_beginscan(tgrel, 0, SnapshotNow, 1, &key);
while (HeapTupleIsValid(tup = heap_getnext(tgscan, 0)))
heap_delete(tgrel, &tup->t_self);
heap_delete(tgrel, &tup->t_self, NULL);
heap_endscan(tgscan);
RelationUnsetLockForWrite(tgrel);
UnlockRelation(tgrel, AccessExclusiveLock);
heap_close(tgrel);
}
@ -376,7 +376,6 @@ RelationBuildTriggers(Relation relation)
ObjectIdGetDatum(RelationGetRelid(relation)));
tgrel = heap_openr(TriggerRelationName);
RelationSetLockForRead(tgrel);
irel = index_openr(TriggerRelidIndex);
sd = index_beginscan(irel, false, 1, &skey);
@ -450,7 +449,6 @@ RelationBuildTriggers(Relation relation)
index_endscan(sd);
pfree(sd);
index_close(irel);
RelationUnsetLockForRead(tgrel);
heap_close(tgrel);
/* Build trigdesc */
@ -657,16 +655,17 @@ ExecARInsertTriggers(Relation rel, HeapTuple trigtuple)
}
bool
ExecBRDeleteTriggers(Relation rel, ItemPointer tupleid)
ExecBRDeleteTriggers(EState *estate, ItemPointer tupleid)
{
TriggerData *SaveTriggerData;
int ntrigs = rel->trigdesc->n_before_row[TRIGGER_EVENT_DELETE];
Trigger **trigger = rel->trigdesc->tg_before_row[TRIGGER_EVENT_DELETE];
HeapTuple trigtuple;
HeapTuple newtuple = NULL;
int i;
Relation rel = estate->es_result_relation_info->ri_RelationDesc;
TriggerData *SaveTriggerData;
int ntrigs = rel->trigdesc->n_before_row[TRIGGER_EVENT_DELETE];
Trigger **trigger = rel->trigdesc->tg_before_row[TRIGGER_EVENT_DELETE];
HeapTuple trigtuple;
HeapTuple newtuple = NULL;
int i;
trigtuple = GetTupleForTrigger(rel, tupleid, true);
trigtuple = GetTupleForTrigger(estate, tupleid, true);
if (trigtuple == NULL)
return false;
@ -692,15 +691,16 @@ ExecBRDeleteTriggers(Relation rel, ItemPointer tupleid)
}
void
ExecARDeleteTriggers(Relation rel, ItemPointer tupleid)
ExecARDeleteTriggers(EState *estate, ItemPointer tupleid)
{
Relation rel = estate->es_result_relation_info->ri_RelationDesc;
TriggerData *SaveTriggerData;
int ntrigs = rel->trigdesc->n_after_row[TRIGGER_EVENT_DELETE];
Trigger **trigger = rel->trigdesc->tg_after_row[TRIGGER_EVENT_DELETE];
HeapTuple trigtuple;
int i;
trigtuple = GetTupleForTrigger(rel, tupleid, false);
trigtuple = GetTupleForTrigger(estate, tupleid, false);
Assert(trigtuple != NULL);
SaveTriggerData = (TriggerData *) palloc(sizeof(TriggerData));
@ -722,17 +722,18 @@ ExecARDeleteTriggers(Relation rel, ItemPointer tupleid)
}
HeapTuple
ExecBRUpdateTriggers(Relation rel, ItemPointer tupleid, HeapTuple newtuple)
ExecBRUpdateTriggers(EState *estate, ItemPointer tupleid, HeapTuple newtuple)
{
TriggerData *SaveTriggerData;
int ntrigs = rel->trigdesc->n_before_row[TRIGGER_EVENT_UPDATE];
Trigger **trigger = rel->trigdesc->tg_before_row[TRIGGER_EVENT_UPDATE];
HeapTuple trigtuple;
HeapTuple oldtuple;
HeapTuple intuple = newtuple;
int i;
Relation rel = estate->es_result_relation_info->ri_RelationDesc;
TriggerData *SaveTriggerData;
int ntrigs = rel->trigdesc->n_before_row[TRIGGER_EVENT_UPDATE];
Trigger **trigger = rel->trigdesc->tg_before_row[TRIGGER_EVENT_UPDATE];
HeapTuple trigtuple;
HeapTuple oldtuple;
HeapTuple intuple = newtuple;
int i;
trigtuple = GetTupleForTrigger(rel, tupleid, true);
trigtuple = GetTupleForTrigger(estate, tupleid, true);
if (trigtuple == NULL)
return NULL;
@ -759,15 +760,16 @@ ExecBRUpdateTriggers(Relation rel, ItemPointer tupleid, HeapTuple newtuple)
}
void
ExecARUpdateTriggers(Relation rel, ItemPointer tupleid, HeapTuple newtuple)
ExecARUpdateTriggers(EState *estate, ItemPointer tupleid, HeapTuple newtuple)
{
Relation rel = estate->es_result_relation_info->ri_RelationDesc;
TriggerData *SaveTriggerData;
int ntrigs = rel->trigdesc->n_after_row[TRIGGER_EVENT_UPDATE];
Trigger **trigger = rel->trigdesc->tg_after_row[TRIGGER_EVENT_UPDATE];
HeapTuple trigtuple;
int i;
trigtuple = GetTupleForTrigger(rel, tupleid, false);
trigtuple = GetTupleForTrigger(estate, tupleid, false);
Assert(trigtuple != NULL);
SaveTriggerData = (TriggerData *) palloc(sizeof(TriggerData));
@ -789,48 +791,67 @@ ExecARUpdateTriggers(Relation rel, ItemPointer tupleid, HeapTuple newtuple)
}
static HeapTuple
GetTupleForTrigger(Relation relation, ItemPointer tid, bool before)
GetTupleForTrigger(EState *estate, ItemPointer tid, bool before)
{
ItemId lp;
Relation relation = estate->es_result_relation_info->ri_RelationDesc;
HeapTupleData tuple;
HeapTuple result;
PageHeader dp;
Buffer b;
b = ReadBuffer(relation, ItemPointerGetBlockNumber(tid));
if (!BufferIsValid(b))
elog(ERROR, "GetTupleForTrigger: failed ReadBuffer");
dp = (PageHeader) BufferGetPage(b);
lp = PageGetItemId(dp, ItemPointerGetOffsetNumber(tid));
Assert(ItemIdIsUsed(lp));
tuple.t_data = (HeapTupleHeader) PageGetItem((Page) dp, lp);
tuple.t_len = ItemIdGetLength(lp);
tuple.t_self = *tid;
Buffer buffer;
if (before)
{
if (TupleUpdatedByCurXactAndCmd(&tuple))
{
elog(NOTICE, "GetTupleForTrigger: Non-functional delete/update");
ReleaseBuffer(b);
return NULL;
}
int test;
HeapTupleSatisfies(&tuple, relation, b, dp,
false, 0, (ScanKey) NULL);
if (!tuple.t_data)
/*
* mark tuple for update
*/
tuple.t_self = *tid;
test = heap_mark4update(relation, &tuple, &buffer);
switch (test)
{
ReleaseBuffer(b);
elog(ERROR, "GetTupleForTrigger: (am)invalid tid");
case HeapTupleSelfUpdated:
ReleaseBuffer(buffer);
return(NULL);
case HeapTupleMayBeUpdated:
break;
case HeapTupleUpdated:
ReleaseBuffer(buffer);
if (XactIsoLevel == XACT_SERIALIZED)
elog(ERROR, "Serialize access failed due to concurrent update");
else
elog(ERROR, "Isolation level %u is not supported", XactIsoLevel);
return(NULL);
default:
ReleaseBuffer(buffer);
elog(ERROR, "Unknown status %u from heap_mark4update", test);
return(NULL);
}
}
else
{
PageHeader dp;
ItemId lp;
buffer = ReadBuffer(relation, ItemPointerGetBlockNumber(tid));
if (!BufferIsValid(buffer))
elog(ERROR, "GetTupleForTrigger: failed ReadBuffer");
dp = (PageHeader) BufferGetPage(buffer);
lp = PageGetItemId(dp, ItemPointerGetOffsetNumber(tid));
Assert(ItemIdIsUsed(lp));
tuple.t_data = (HeapTupleHeader) PageGetItem((Page) dp, lp);
tuple.t_len = ItemIdGetLength(lp);
tuple.t_self = *tid;
}
result = heap_copytuple(&tuple);
ReleaseBuffer(b);
ReleaseBuffer(buffer);
return result;
}