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Fix very old bug which made tuples changed/inserted by a commnd

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visible to command itself (so we had multiple update of updated tuples,
etc).
This commit is contained in:
Vadim B. Mikheev
1997-08-29 09:05:25 +00:00
parent e06099c607
commit 3152996ffb
3 changed files with 63 additions and 11 deletions
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42
src/backend/access/transam/xact.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.12 1997/08/19 21:30:19 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.13 1997/08/29 09:02:11 vadim Exp $
*
* NOTES
* Transaction aborts can now occur two ways:
@ -377,6 +377,22 @@ GetCurrentCommandId()
return s->commandId;
}
CommandId
GetScanCommandId()
{
TransactionState s = CurrentTransactionState;
/* ----------------
* if the transaction system is disabled, we return
* the special "disabled" command id.
* ----------------
*/
if (s->state == TRANS_DISABLED)
return (CommandId) DisabledCommandId;
return s->scanCommandId;
}
/* --------------------------------
* GetCurrentTransactionStartTime
@ -432,6 +448,18 @@ CommandIdIsCurrentCommandId(CommandId cid)
(cid == s->commandId) ? true : false;
}
bool
CommandIdGEScanCommandId(CommandId cid)
{
TransactionState s = CurrentTransactionState;
if (AMI_OVERRIDE)
return false;
return
(cid >= s->scanCommandId) ? true : false;
}
/* --------------------------------
* ClearCommandIdCounterOverflowFlag
@ -458,11 +486,22 @@ CommandCounterIncrement()
elog(WARN, "You may only have 65535 commands per transaction");
}
CurrentTransactionStateData.scanCommandId =
CurrentTransactionStateData.commandId;
/* make cache changes visible to me */
AtCommit_Cache();
AtStart_Cache();
}
void
SetScanCommandId (CommandId savedId)
{
CurrentTransactionStateData.scanCommandId = savedId;
}
/* ----------------------------------------------------------------
* initialization stuff
* ----------------------------------------------------------------
@ -757,6 +796,7 @@ StartTransaction()
* ----------------
*/
s->commandId = FirstCommandId;
s->scanCommandId = FirstCommandId;
s->startTime = GetCurrentAbsoluteTime();
/* ----------------