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Good Bye, Time Travel!

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This commit is contained in:
Vadim B. Mikheev
1997-11-02 15:27:14 +00:00
parent 6cc0a00dec
commit 32cd09ac6d
36 changed files with 265 additions and 1841 deletions
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225
src/backend/access/transam/transsup.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/transam/Attic/transsup.c,v 1.13 1997/09/08 21:41:46 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/Attic/transsup.c,v 1.14 1997/11/02 15:24:44 vadim Exp $
*
* NOTES
* This file contains support functions for the high
@@ -23,16 +23,10 @@
#include <access/xact.h>
#include <storage/lmgr.h>
static AbsoluteTime
TransBlockGetCommitTime(Block tblock,
TransactionId transactionId);
static XidStatus
TransBlockGetXidStatus(Block tblock,
TransactionId transactionId);
static void
TransBlockSetCommitTime(Block tblock,
TransactionId transactionId, AbsoluteTime commitTime);
static void
TransBlockSetXidStatus(Block tblock,
TransactionId transactionId, XidStatus xstatus);
@@ -73,8 +67,6 @@ TransComputeBlockNumber(Relation relation, /* relation to test */
*/
if (relation == LogRelation)
itemsPerBlock = TP_NumXidStatusPerBlock;
else if (relation == TimeRelation)
itemsPerBlock = TP_NumTimePerBlock;
else
elog(WARN, "TransComputeBlockNumber: unknown relation");
@@ -197,15 +189,6 @@ TransBlockGetXidStatus(Block tblock,
bits8 bit2;
BitIndex offset;
/* ----------------
* sanity check
* ----------------
*/
if (tblock == NULL)
{
return XID_INVALID;
}
/* ----------------
* calculate the index into the transaction data where
* our transaction status is located
@@ -248,13 +231,6 @@ TransBlockSetXidStatus(Block tblock,
Index index;
BitIndex offset;
/* ----------------
* sanity check
* ----------------
*/
if (tblock == NULL)
return;
/* ----------------
* calculate the index into the transaction data where
* we sould store our transaction status.
@@ -295,90 +271,6 @@ TransBlockSetXidStatus(Block tblock,
}
}
/* --------------------------------
* TransBlockGetCommitTime
*
* This returns the transaction commit time for the
* specified transaction id in the trans block.
* --------------------------------
*/
static AbsoluteTime
TransBlockGetCommitTime(Block tblock,
TransactionId transactionId)
{
Index index;
AbsoluteTime *timeArray;
/* ----------------
* sanity check
* ----------------
*/
if (tblock == NULL)
return INVALID_ABSTIME;
/* ----------------
* calculate the index into the transaction data where
* our transaction commit time is located
*
* XXX this will be replaced soon when we move to the
* new transaction id scheme -cim 3/23/90
*
* The new scheme is here. -mer 5/24/92
* ----------------
*/
index = transactionId % TP_NumTimePerBlock;
/* ----------------
* return the commit time to the caller
* ----------------
*/
timeArray = (AbsoluteTime *) tblock;
return (AbsoluteTime)
timeArray[index];
}
/* --------------------------------
* TransBlockSetCommitTime
*
* This sets the commit time of the specified transaction
* --------------------------------
*/
static void
TransBlockSetCommitTime(Block tblock,
TransactionId transactionId,
AbsoluteTime commitTime)
{
Index index;
AbsoluteTime *timeArray;
/* ----------------
* sanity check
* ----------------
*/
if (tblock == NULL)
return;
/* ----------------
* calculate the index into the transaction data where
* we sould store our transaction status.
*
* XXX this will be replaced soon when we move to the
* new transaction id scheme -cim 3/23/90
*
* The new scheme is here. -mer 5/24/92
* ----------------
*/
index = transactionId % TP_NumTimePerBlock;
/* ----------------
* store the transaction commit time at the specified index
* ----------------
*/
timeArray = (AbsoluteTime *) tblock;
timeArray[index] = commitTime;
}
/* ----------------------------------------------------------------
* transam i/o support routines
* ----------------------------------------------------------------
@@ -494,121 +386,6 @@ TransBlockNumberSetXidStatus(Relation relation,
RelationUnsetLockForWrite(relation);
}
/* --------------------------------
* TransBlockNumberGetCommitTime
* --------------------------------
*/
AbsoluteTime
TransBlockNumberGetCommitTime(Relation relation,
BlockNumber blockNumber,
TransactionId xid,
bool *failP)
{
Buffer buffer; /* buffer associated with block */
Block block; /* block containing commit time */
bool localfail; /* bool used if failP = NULL */
AbsoluteTime xtime; /* commit time */
/* ----------------
* SOMEDAY place a read lock on the time relation
*
* That someday is today 5 Aug. 1991 -mer
* ----------------
*/
RelationSetLockForRead(relation);
/* ----------------
* get the block containing the transaction information
* ----------------
*/
buffer = ReadBuffer(relation, blockNumber);
block = BufferGetBlock(buffer);
/* ----------------
* get the commit time from the block
* note, for now we always return false in failP.
* ----------------
*/
if (failP == NULL)
failP = &localfail;
(*failP) = false;
xtime = TransBlockGetCommitTime(block, xid);
/* ----------------
* release the buffer and return the commit time
* ----------------
*/
ReleaseBuffer(buffer);
/* ----------------
* SOMEDAY release our lock on the time relation
* ----------------
*/
RelationUnsetLockForRead(relation);
if ((*failP) == false)
return xtime;
else
return INVALID_ABSTIME;
}
/* --------------------------------
* TransBlockNumberSetCommitTime
* --------------------------------
*/
void
TransBlockNumberSetCommitTime(Relation relation,
BlockNumber blockNumber,
TransactionId xid,
AbsoluteTime xtime,
bool *failP)
{
Buffer buffer; /* buffer associated with block */
Block block; /* block containing commit time */
bool localfail; /* bool used if failP = NULL */
/* ----------------
* SOMEDAY gain exclusive access to the time relation
*
* That someday is today 5 Aug. 1991 -mer
* ----------------
*/
RelationSetLockForWrite(relation);
/* ----------------
* get the block containing our commit time
* ----------------
*/
buffer = ReadBuffer(relation, blockNumber);
block = BufferGetBlock(buffer);
/* ----------------
* attempt to update the commit time of the transaction on the block.
* if we are successful, write the block. otherwise release the buffer.
* note, for now we always return false in failP.
* ----------------
*/
if (failP == NULL)
failP = &localfail;
(*failP) = false;
TransBlockSetCommitTime(block, xid, xtime);
if ((*failP) == false)
WriteBuffer(buffer);
else
ReleaseBuffer(buffer);
/* ----------------
* SOMEDAY release our lock on the time relation
* ----------------
*/
RelationUnsetLockForWrite(relation);
}
/* --------------------------------
* TransGetLastRecordedTransaction
* --------------------------------