Serialized mode works!

src/backend/access/transam/transam.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.20 1998/12/15 12:45:30 vadim Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.21 1998/12/16 11:53:44 vadim Exp $
  *
  * NOTES
  *	  This file contains the high level access-method interface to the
@@ -172,12 +172,8 @@ TransactionLogTest(TransactionId transactionId, /* transaction id to test */
 
 	if (!fail)
 	{
-		/* must not cache status of running xaction !!! */
+		TransactionIdStore(transactionId, &cachedTestXid);
-		if (xidstatus != XID_INPROGRESS)
+		cachedTestXidStatus = xidstatus;
-		{
-			TransactionIdStore(transactionId, &cachedTestXid);
-			cachedTestXidStatus = xidstatus;
-		}
 		return (bool)
 			(status == xidstatus);
 	}
@@ -230,11 +226,8 @@ TransactionLogUpdate(TransactionId transactionId,		/* trans id to update */
 	 *
 	 * What's the hell ?! Why != XID_COMMIT ?!
 	 */
-	if (status != XID_INPROGRESS)
+	TransactionIdStore(transactionId, &cachedTestXid);
-	{
+	cachedTestXidStatus = status;
-		TransactionIdStore(transactionId, &cachedTestXid);
-		cachedTestXidStatus = status;
-	}
 
 }
 
@@ -588,14 +581,11 @@ TransactionIdAbort(TransactionId transactionId)
 	TransactionLogUpdate(transactionId, XID_ABORT);
 }
 
-#ifdef NOT_USED
 void
-TransactionIdSetInProgress(TransactionId transactionId)
+TransactionIdFlushCache()
 {
-	if (AMI_OVERRIDE)
-		return;
 
-	TransactionLogUpdate(transactionId, XID_INPROGRESS);
+	TransactionIdStore(AmiTransactionId, &cachedTestXid);
+	cachedTestXidStatus = XID_COMMIT;
+
 }
-
-#endif

src/backend/access/transam/xact.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.26 1998/12/15 12:45:35 vadim Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.27 1998/12/16 11:53:44 vadim Exp $
  *
  * NOTES
  *		Transaction aborts can now occur two ways:
@@ -516,6 +516,9 @@ CommandCounterIncrement()
 	/* make cache changes visible to me */
 	AtCommit_Cache();
 	AtStart_Cache();
+
+	TransactionIdFlushCache();
+	
 }
 
 void
@@ -793,6 +796,9 @@ StartTransaction()
 {
 	TransactionState s = CurrentTransactionState;
 
+	TransactionIdFlushCache();
+	FreeXactSnapshot();
+
 	/* ----------------
 	 *	Check the current transaction state.  If the transaction system
 	 *	is switched off, or if we're already in a transaction, do nothing.

src/backend/executor/execMain.c

@@ -26,7 +26,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.60 1998/12/15 12:46:04 vadim Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.61 1998/12/16 11:53:45 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -124,7 +124,7 @@ ExecutorStart(QueryDesc *queryDesc, EState *estate)
 		memset(estate->es_param_exec_vals, 0, queryDesc->plantree->nParamExec * sizeof(ParamExecData));
 	}
 
-	estate->es_snapshot = SnapshotNow;
+	estate->es_snapshot = QuerySnapshot;
 
 	result = InitPlan(queryDesc->operation,
 					  queryDesc->parsetree,

src/backend/storage/ipc/shmem.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/storage/ipc/shmem.c,v 1.32 1998/12/15 12:46:24 vadim Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/storage/ipc/shmem.c,v 1.33 1998/12/16 11:53:46 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -633,27 +633,21 @@ TransactionIdIsInProgress(TransactionId xid)
 /*
  * GetSnapshotData -- returns information about running transactions.
  *
- * InvalidTransactionId is used as terminator in snapshot->xip array.
- * If serialized is true then XID >= current xact ID will not be
- * placed in array. Current xact ID are never placed there (just
- * to reduce its length, xmin/xmax may be equal to cid).
- * MyProc->xmin will be setted if equal to InvalidTransactionId.
- *
  * Yet another strange func for this place...	- vadim 07/21/98
  */
 Snapshot
-GetSnapshotData(bool serialized)
+GetSnapshotData(void)
 {
 	Snapshot	snapshot = (Snapshot) malloc(sizeof(SnapshotData));
 	ShmemIndexEnt *result;
 	PROC	   *proc;
 	TransactionId cid = GetCurrentTransactionId();
 	uint32		count = 0;
-	uint32		have = 31;
+	uint32		have = 32;
 
 	Assert(ShmemIndex);
 
-	snapshot->xip = (TransactionId *) malloc(32 * sizeof(TransactionId));
+	snapshot->xip = (TransactionId *) malloc(have * sizeof(TransactionId));
 	snapshot->xmax = cid;
 	snapshot->xmin = cid;
 
@@ -667,15 +661,14 @@ GetSnapshotData(bool serialized)
 			if (MyProc->xmin == InvalidTransactionId)
 				MyProc->xmin = snapshot->xmin;
 			SpinRelease(ShmemIndexLock);
-			snapshot->xip[count] = InvalidTransactionId;
+			snapshot->xcnt = count;
 			return snapshot;
 		}
 		if (result->location == INVALID_OFFSET ||
 			strncmp(result->key, "PID ", 4) != 0)
 			continue;
 		proc = (PROC *) MAKE_PTR(result->location);
-		if (proc == MyProc || proc->xid < FirstTransactionId ||
+		if (proc == MyProc || proc->xid < FirstTransactionId)
-			(serialized && proc->xid >= cid))
 			continue;
 		if (proc->xid < snapshot->xmin)
 			snapshot->xmin = proc->xid;
@@ -684,7 +677,7 @@ GetSnapshotData(bool serialized)
 		if (have == 0)
 		{
 			snapshot->xip = (TransactionId *) realloc(snapshot->xip,
-								   (count + 33) * sizeof(TransactionId));
+								   (count + 32) * sizeof(TransactionId));
 			have = 32;
 		}
 		snapshot->xip[count] = proc->xid;

src/backend/storage/lmgr/lmgr.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.20 1998/12/15 12:46:30 vadim Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.21 1998/12/16 11:53:48 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -325,6 +325,7 @@ XactLockTableWait(TransactionId xid)
 
 	LockAcquire(LockTableId, &tag, ShareLock);
 
+	TransactionIdFlushCache();
 	/*
 	 * Transaction was committed/aborted/crashed - 
 	 * we have to update pg_log if transaction is still

src/backend/tcop/postgres.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.94 1998/10/16 06:05:13 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.95 1998/12/16 11:53:52 vadim Exp $
  *
  * NOTES
  *	  this is the "main" module of the postgres backend and
@@ -786,9 +786,10 @@ pg_exec_query_dest(char *query_string,	/* string to execute */
 			}
 #endif
 
-			/* ----------------
+			SetQuerySnapshot();
+
+			/*
 			 *	 execute the plan
-			 *
 			 */
 			if (ShowExecutorStats)
 				ResetUsage();
@@ -1519,7 +1520,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
 	if (!IsUnderPostmaster)
 	{
 		puts("\nPOSTGRES backend interactive interface ");
-		puts("$Revision: 1.94 $ $Date: 1998/10/16 06:05:13 $\n");
+		puts("$Revision: 1.95 $ $Date: 1998/12/16 11:53:52 $\n");
 	}
 
 	/* ----------------

src/backend/utils/time/tqual.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.21 1998/12/15 12:46:40 vadim Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.22 1998/12/16 11:53:55 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -29,6 +29,9 @@ extern bool PostgresIsInitialized;
 SnapshotData	SnapshotDirtyData;
 Snapshot		SnapshotDirty = &SnapshotDirtyData;
 
+Snapshot		QuerySnapshot = NULL;
+static Snapshot	SerializedSnapshot = NULL;
+
 /*
  * XXX Transaction system override hacks start here
  */
@@ -436,3 +439,159 @@ HeapTupleSatisfiesDirty(HeapTupleHeader tuple)
 
 	return false;								/* updated by other */
 }
+
+bool
+HeapTupleSatisfiesSnapshot(HeapTupleHeader tuple, Snapshot snapshot)
+{
+	if (AMI_OVERRIDE)
+		return true;
+
+	if (!(tuple->t_infomask & HEAP_XMIN_COMMITTED))
+	{
+		if (tuple->t_infomask & HEAP_XMIN_INVALID)		/* xid invalid or
+														 * aborted */
+			return false;
+
+		if (TransactionIdIsCurrentTransactionId(tuple->t_xmin))
+		{
+			if (CommandIdGEScanCommandId(tuple->t_cmin))
+				return false;	/* inserted after scan started */
+
+			if (tuple->t_infomask & HEAP_XMAX_INVALID)	/* xid invalid */
+				return true;
+
+			Assert(TransactionIdIsCurrentTransactionId(tuple->t_xmax));
+
+			if (tuple->t_infomask & HEAP_MARKED_FOR_UPDATE)
+				return true;
+
+			if (CommandIdGEScanCommandId(tuple->t_cmax))
+				return true;	/* deleted after scan started */
+			else
+				return false;	/* deleted before scan started */
+		}
+
+		/*
+		 * this call is VERY expensive - requires a log table lookup.
+		 */
+
+		if (!TransactionIdDidCommit(tuple->t_xmin))
+		{
+			if (TransactionIdDidAbort(tuple->t_xmin))
+				tuple->t_infomask |= HEAP_XMIN_INVALID; /* aborted */
+			return false;
+		}
+
+		tuple->t_infomask |= HEAP_XMIN_COMMITTED;
+	}
+
+	/* 
+	 * By here, the inserting transaction has committed -
+	 * have to check when...
+	 */
+
+	if (tuple->t_xmin >= snapshot->xmax)
+		return false;
+	if (tuple->t_xmin >= snapshot->xmin)
+	{
+		uint32	i;
+		
+		for (i = 0; i < snapshot->xcnt; i++)
+		{
+			if (tuple->t_xmin == snapshot->xip[i])
+				return false;
+		}
+	}
+
+	if (tuple->t_infomask & HEAP_XMAX_INVALID)	/* xid invalid or aborted */
+		return true;
+
+	if (tuple->t_infomask & HEAP_MARKED_FOR_UPDATE)
+		return true;
+
+	if (!(tuple->t_infomask & HEAP_XMAX_COMMITTED))
+	{
+		if (TransactionIdIsCurrentTransactionId(tuple->t_xmax))
+		{
+			if (CommandIdGEScanCommandId(tuple->t_cmax))
+				return true;		/* deleted after scan started */
+			else
+				return false;		/* deleted before scan started */
+		}
+
+		if (!TransactionIdDidCommit(tuple->t_xmax))
+		{
+			if (TransactionIdDidAbort(tuple->t_xmax))
+				tuple->t_infomask |= HEAP_XMAX_INVALID;		/* aborted */
+			return true;
+		}
+
+		/* xmax transaction committed */
+		tuple->t_infomask |= HEAP_XMAX_COMMITTED;
+	}
+
+	if (tuple->t_xmax >= snapshot->xmax)
+		return true;
+	if (tuple->t_xmax >= snapshot->xmin)
+	{
+		uint32	i;
+		
+		for (i = 0; i < snapshot->xcnt; i++)
+		{
+			if (tuple->t_xmax == snapshot->xip[i])
+				return true;
+		}
+	}
+
+	return false;
+}
+
+void
+SetQuerySnapshot(void)
+{
+
+	/* 1st call in xaction */
+	if (SerializedSnapshot == NULL)
+	{
+		SerializedSnapshot = GetSnapshotData();
+		QuerySnapshot = SerializedSnapshot;
+		Assert(QuerySnapshot != NULL);
+		return;
+	}
+
+	if (QuerySnapshot != SerializedSnapshot)
+	{
+		free(QuerySnapshot->xip);
+		free(QuerySnapshot);
+	}
+
+	if (XactIsoLevel == XACT_SERIALIZED)
+		QuerySnapshot = SerializedSnapshot;
+	else
+		QuerySnapshot = GetSnapshotData();
+
+	Assert(QuerySnapshot != NULL);
+
+}
+
+void
+FreeXactSnapshot(void)
+{
+
+	if (QuerySnapshot != NULL && QuerySnapshot != SerializedSnapshot)
+	{
+		free(QuerySnapshot->xip);
+		free(QuerySnapshot);
+	}
+
+	QuerySnapshot = NULL;
+
+	if (SerializedSnapshot != NULL)
+	{
+		free(SerializedSnapshot->xip);
+		free(SerializedSnapshot);
+	}
+
+	SerializedSnapshot = NULL;
+
+}

src/include/access/transam.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: transam.h,v 1.16 1998/09/01 04:34:31 momjian Exp $
+ * $Id: transam.h,v 1.17 1998/12/16 11:52:10 vadim Exp $
  *
  *	 NOTES
  *		Transaction System Version 101 now support proper oid
@@ -145,6 +145,7 @@ extern bool TransactionIdDidCommit(TransactionId transactionId);
 extern bool TransactionIdDidAbort(TransactionId transactionId);
 extern void TransactionIdCommit(TransactionId transactionId);
 extern void TransactionIdAbort(TransactionId transactionId);
+extern void	TransactionIdFlushCache(void);
 
 /* in transam/transsup.c */
 extern void AmiTransactionOverride(bool flag);

src/include/utils/tqual.h

@@ -7,7 +7,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: tqual.h,v 1.16 1998/12/15 12:47:01 vadim Exp $
+ * $Id: tqual.h,v 1.17 1998/12/16 11:52:11 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -19,7 +19,8 @@
 typedef struct SnapshotData
 {
 	TransactionId	xmin;			/* XID < xmin are visible to me */
-	TransactionId	xmax;			/* XID > xmax are invisible to me */
+	TransactionId	xmax;			/* XID >= xmax are invisible to me */
+	uint32			xcnt;			/* # of xact below */
 	TransactionId  *xip;			/* array of xacts in progress */
 }			SnapshotData;
 
@@ -27,7 +28,9 @@ typedef SnapshotData *Snapshot;
 
 #define SnapshotNow					((Snapshot) 0x0)
 #define SnapshotSelf				((Snapshot) 0x1)
+
 extern	Snapshot					SnapshotDirty;
+extern	Snapshot					QuerySnapshot;
 
 #define IsSnapshotNow(snapshot)		((Snapshot) snapshot == SnapshotNow)
 #define IsSnapshotSelf(snapshot)	((Snapshot) snapshot == SnapshotSelf)
@@ -55,7 +58,11 @@ extern CommandId HeapSpecialCommandId;
 			((IsSnapshotDirty(snapshot)) ? \
 				HeapTupleSatisfiesDirty((tuple)->t_data) \
 			: \
-				HeapTupleSatisfiesNow((tuple)->t_data) \
+				((IsSnapshotNow(snapshot)) ? \
+					HeapTupleSatisfiesNow((tuple)->t_data) \
+				: \
+					HeapTupleSatisfiesSnapshot((tuple)->t_data, snapshot) \
+				) \
 			) \
 	) \
 )
@@ -87,9 +94,13 @@ extern CommandId HeapSpecialCommandId;
 extern bool		HeapTupleSatisfiesItself(HeapTupleHeader tuple);
 extern bool		HeapTupleSatisfiesNow(HeapTupleHeader tuple);
 extern bool		HeapTupleSatisfiesDirty(HeapTupleHeader tuple);
+extern bool		HeapTupleSatisfiesSnapshot(HeapTupleHeader tuple, Snapshot snapshot);
 extern int		HeapTupleSatisfiesUpdate(HeapTuple tuple);
 
 extern void setheapoverride(bool on);
-extern Snapshot GetSnapshotData(bool serialized);
+
+extern Snapshot GetSnapshotData(void);
+extern void		SetQuerySnapshot(void);
+extern void		FreeXactSnapshot(void);
 
 #endif	 /* TQUAL_H */