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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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21
src/backend/access/transam/transam.c
View File

@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.19 1998/09/01 04:27:15 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.20 1998/12/15 12:45:30 vadim Exp $
*
* NOTES
* This file contains the high level access-method interface to the
@@ -172,8 +172,12 @@ TransactionLogTest(TransactionId transactionId, /* transaction id to test */
if (!fail)
{
TransactionIdStore(transactionId, &cachedTestXid);
cachedTestXidStatus = xidstatus;
/* must not cache status of running xaction !!! */
if (xidstatus != XID_INPROGRESS)
{
TransactionIdStore(transactionId, &cachedTestXid);
cachedTestXidStatus = xidstatus;
}
return (bool)
(status == xidstatus);
}
@@ -219,11 +223,14 @@ TransactionLogUpdate(TransactionId transactionId, /* trans id to update */
status,
&fail);
/* ----------------
* update (invalidate) our single item TransactionLogTest cache.
* ----------------
*/
/*
* update (invalidate) our single item TransactionLogTest cache.
*
if (status != XID_COMMIT)
*
* What's the hell ?! Why != XID_COMMIT ?!
*/
if (status != XID_INPROGRESS)
{
TransactionIdStore(transactionId, &cachedTestXid);
cachedTestXidStatus = status;

33
src/backend/access/transam/transsup.c
View File

@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/transam/Attic/transsup.c,v 1.17 1998/09/01 04:27:16 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/Attic/transsup.c,v 1.18 1998/12/15 12:45:33 vadim Exp $
*
* NOTES
* This file contains support functions for the high
@@ -289,18 +289,12 @@ TransBlockNumberGetXidStatus(Relation relation,
XidStatus xstatus; /* recorded status of xid */
bool localfail; /* bool used if failP = NULL */
/* ----------------
* SOMEDAY place a read lock on the log relation
* That someday is today 5 Aug 1991 -mer
* ----------------
*/
RelationSetLockForRead(relation);
/* ----------------
* get the page containing the transaction information
* ----------------
*/
buffer = ReadBuffer(relation, blockNumber);
LockBuffer(buffer, BUFFER_LOCK_SHARE);
block = BufferGetBlock(buffer);
/* ----------------
@@ -318,14 +312,9 @@ TransBlockNumberGetXidStatus(Relation relation,
* release the buffer and return the status
* ----------------
*/
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
ReleaseBuffer(buffer);
/* ----------------
* SOMEDAY release our lock on the log relation
* ----------------
*/
RelationUnsetLockForRead(relation);
return
xstatus;
}
@@ -345,19 +334,12 @@ TransBlockNumberSetXidStatus(Relation relation,
Block block; /* block containing xstatus */
bool localfail; /* bool used if failP = NULL */
/* ----------------
* SOMEDAY gain exclusive access to the log relation
*
* That someday is today 5 Aug 1991 -mer
* ----------------
*/
RelationSetLockForWrite(relation);
/* ----------------
* get the block containing the transaction status
* ----------------
*/
buffer = ReadBuffer(relation, blockNumber);
LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
block = BufferGetBlock(buffer);
/* ----------------
@@ -372,16 +354,11 @@ TransBlockNumberSetXidStatus(Relation relation,
TransBlockSetXidStatus(block, xid, xstatus);
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
if ((*failP) == false)
WriteBuffer(buffer);
else
ReleaseBuffer(buffer);
/* ----------------
* SOMEDAY release our lock on the log relation
* ----------------
*/
RelationUnsetLockForWrite(relation);
}
/* --------------------------------

7
src/backend/access/transam/xact.c
View File

@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.25 1998/10/08 18:29:15 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.26 1998/12/15 12:45:35 vadim Exp $
*
* NOTES
* Transaction aborts can now occur two ways:
@@ -194,6 +194,8 @@ TransactionStateData CurrentTransactionStateData = {
TransactionState CurrentTransactionState =
&CurrentTransactionStateData;
int XactIsoLevel = XACT_SERIALIZED;
/* ----------------
* info returned when the system is disabled
*
@@ -816,6 +818,8 @@ StartTransaction()
*/
GetNewTransactionId(&(s->transactionIdData));
XactLockTableInsert(s->transactionIdData);
/* ----------------
* initialize current transaction state fields
* ----------------
@@ -966,6 +970,7 @@ AbortTransaction()
* do abort processing
* ----------------
*/
UnlockBuffers();
AtAbort_Notify();
CloseSequences();
AtEOXact_portals();