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synced 2024-09-28 00:41:52 +02:00
Fix very old bug which made tuples changed/inserted by a commnd
visible to command itself (so we had multiple update of updated tuples, etc).
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parent
e06099c607
commit
3152996ffb
@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.12 1997/08/19 21:30:19 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.13 1997/08/29 09:02:11 vadim Exp $
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*
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* NOTES
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* Transaction aborts can now occur two ways:
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@ -377,6 +377,22 @@ GetCurrentCommandId()
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return s->commandId;
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}
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CommandId
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GetScanCommandId()
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{
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TransactionState s = CurrentTransactionState;
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/* ----------------
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* if the transaction system is disabled, we return
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* the special "disabled" command id.
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* ----------------
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*/
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if (s->state == TRANS_DISABLED)
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return (CommandId) DisabledCommandId;
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return s->scanCommandId;
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}
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/* --------------------------------
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* GetCurrentTransactionStartTime
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@ -432,6 +448,18 @@ CommandIdIsCurrentCommandId(CommandId cid)
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(cid == s->commandId) ? true : false;
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}
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bool
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CommandIdGEScanCommandId(CommandId cid)
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{
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TransactionState s = CurrentTransactionState;
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if (AMI_OVERRIDE)
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return false;
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return
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(cid >= s->scanCommandId) ? true : false;
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}
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/* --------------------------------
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* ClearCommandIdCounterOverflowFlag
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@ -458,11 +486,22 @@ CommandCounterIncrement()
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elog(WARN, "You may only have 65535 commands per transaction");
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}
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CurrentTransactionStateData.scanCommandId =
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CurrentTransactionStateData.commandId;
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/* make cache changes visible to me */
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AtCommit_Cache();
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AtStart_Cache();
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}
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void
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SetScanCommandId (CommandId savedId)
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{
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CurrentTransactionStateData.scanCommandId = savedId;
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}
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/* ----------------------------------------------------------------
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* initialization stuff
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* ----------------------------------------------------------------
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@ -757,6 +796,7 @@ StartTransaction()
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* ----------------
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*/
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s->commandId = FirstCommandId;
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s->scanCommandId = FirstCommandId;
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s->startTime = GetCurrentAbsoluteTime();
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/* ----------------
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.3 1997/08/19 21:36:12 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.4 1997/08/29 09:04:54 vadim Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -580,6 +580,13 @@ HeapTupleSatisfiesItself(HeapTuple tuple)
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* (Xmax is not committed && the row was deleted by another transaction
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* Xmax != my-transaction)))) that has not been committed
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*
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* XXX
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* CommandId stuff didn't work properly if one used SQL-functions in
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* UPDATE/INSERT(fromSELECT)/DELETE scans: SQL-funcs call
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* CommandCounterIncrement and made tuples changed/inserted by
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* current command visible to command itself (so we had multiple
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* update of updated tuples, etc). - vadim 08/29/97
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*
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* mao says 17 march 1993: the tests in this routine are correct;
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* if you think they're not, you're wrong, and you should think
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* about it again. i know, it happened to me. we don't need to
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@ -615,13 +622,13 @@ HeapTupleSatisfiesNow(HeapTuple tuple)
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if (!AbsoluteTimeIsBackwardCompatiblyValid(tuple->t_tmin)) {
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if (TransactionIdIsCurrentTransactionId((TransactionId)tuple->t_xmin)
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&& CommandIdIsCurrentCommandId(tuple->t_cmin)) {
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&& CommandIdGEScanCommandId(tuple->t_cmin)) {
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return (false);
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}
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if (TransactionIdIsCurrentTransactionId((TransactionId)tuple->t_xmin)
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&& !CommandIdIsCurrentCommandId(tuple->t_cmin)) {
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&& !CommandIdGEScanCommandId(tuple->t_cmin)) {
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if (!TransactionIdIsValid((TransactionId)tuple->t_xmax)) {
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return (true);
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@ -629,7 +636,7 @@ HeapTupleSatisfiesNow(HeapTuple tuple)
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Assert(TransactionIdIsCurrentTransactionId((TransactionId)tuple->t_xmax));
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if (CommandIdIsCurrentCommandId(tuple->t_cmax)) {
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if (CommandIdGEScanCommandId(tuple->t_cmax)) {
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return (true);
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}
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}
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@ -813,13 +820,13 @@ HeapTupleSatisfiesUpperUnboundedInternalTimeQual(HeapTuple tuple,
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if (!AbsoluteTimeIsBackwardCompatiblyValid(tuple->t_tmin)) {
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if (TransactionIdIsCurrentTransactionId((TransactionId)tuple->t_xmin) &&
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CommandIdIsCurrentCommandId(tuple->t_cmin)) {
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CommandIdGEScanCommandId(tuple->t_cmin)) {
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return (false);
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}
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if (TransactionIdIsCurrentTransactionId((TransactionId)tuple->t_xmin) &&
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!CommandIdIsCurrentCommandId(tuple->t_cmin)) {
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!CommandIdGEScanCommandId(tuple->t_cmin)) {
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if (!TransactionIdIsValid((TransactionId)tuple->t_xmax)) {
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return (true);
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@ -827,7 +834,7 @@ HeapTupleSatisfiesUpperUnboundedInternalTimeQual(HeapTuple tuple,
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Assert(TransactionIdIsCurrentTransactionId((TransactionId)tuple->t_xmax));
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return ((bool) !CommandIdIsCurrentCommandId(tuple->t_cmax));
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return ((bool) !CommandIdGEScanCommandId(tuple->t_cmax));
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}
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if (!TransactionIdDidCommit((TransactionId)tuple->t_xmin)) {
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@ -849,7 +856,8 @@ HeapTupleSatisfiesUpperUnboundedInternalTimeQual(HeapTuple tuple,
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}
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if (TransactionIdIsCurrentTransactionId((TransactionId)tuple->t_xmax)) {
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return (CommandIdIsCurrentCommandId(tuple->t_cmin));
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return (CommandIdGEScanCommandId(tuple->t_cmin));
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/* it looks like error ^^^^ */
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}
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if (!TransactionIdDidCommit((TransactionId)tuple->t_xmax)) {
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@ -6,7 +6,7 @@
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: xact.h,v 1.5 1997/08/19 21:37:40 momjian Exp $
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* $Id: xact.h,v 1.6 1997/08/29 09:05:25 vadim Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -22,7 +22,8 @@
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typedef struct TransactionStateData {
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TransactionId transactionIdData;
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CommandId commandId;
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AbsoluteTime startTime;
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CommandId scanCommandId;
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AbsoluteTime startTime;
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int state;
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int blockState;
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} TransactionStateData;
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@ -63,9 +64,12 @@ extern bool IsAbortedTransactionBlockState(void);
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extern void OverrideTransactionSystem(bool flag);
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extern TransactionId GetCurrentTransactionId(void);
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extern CommandId GetCurrentCommandId(void);
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extern CommandId GetScanCommandId(void);
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extern void SetScanCommandId(CommandId);
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extern AbsoluteTime GetCurrentTransactionStartTime(void);
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extern bool TransactionIdIsCurrentTransactionId(TransactionId xid);
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extern bool CommandIdIsCurrentCommandId(CommandId cid);
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extern bool CommandIdGEScanCommandId(CommandId cid);
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extern void CommandCounterIncrement(void);
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extern void InitializeTransactionSystem(void);
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extern bool CurrentXactInProgress(void);
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