pg_variable is not used in WAL version now.

Author: vadim4o

src/backend/access/transam/transam.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.35 2000/08/03 19:18:55 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.36 2000/11/03 11:39:35 vadim Exp $
  *
  * NOTES
  *	  This file contains the high level access-method interface to the
@@ -83,6 +83,10 @@ int			RecoveryCheckingEnableState = 0;
  */
 extern int	OidGenLockId;
 
+#ifdef XLOG
+#include "miscadmin.h"
+extern VariableCache ShmemVariableCache;
+#endif
 
 /* ----------------
  *		recovery checking accessors
@@ -438,7 +442,13 @@ InitializeTransactionLog(void)
 		TransactionLogUpdate(AmiTransactionId, XID_COMMIT);
 		TransactionIdStore(AmiTransactionId, &cachedTestXid);
 		cachedTestXidStatus = XID_COMMIT;
+#ifdef XLOG
+		Assert(!IsUnderPostmaster && 
+				ShmemVariableCache->nextXid <= FirstTransactionId);
+		ShmemVariableCache->nextXid = FirstTransactionId;
+#else
 		VariableRelationPutNextXid(FirstTransactionId);
+#endif
 
 	}
 	else if (RecoveryCheckingEnabled())

src/backend/access/transam/varsup.c

@@ -8,10 +8,15 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/access/transam/varsup.c,v 1.30 2000/10/28 16:20:53 vadim Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/access/transam/varsup.c,v 1.31 2000/11/03 11:39:35 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
+#ifdef XLOG
+
+#include "xlog_varsup.c"
+
+#else
 
 #include "postgres.h"
 
@@ -125,11 +130,7 @@ VariableRelationPutNextXid(TransactionId xid)
 
 	TransactionIdStore(xid, &(var->nextXidData));
 
-#ifdef XLOG
-	WriteBuffer(buf);	/* temp */
-#else
 	FlushBuffer(buf, TRUE);
-#endif
 }
 
 /* --------------------------------
@@ -520,3 +521,5 @@ CheckMaxObjectId(Oid assigned_oid)
 	prefetched_oid_count = 0;	/* force reload */
 	GetNewObjectId(&temp_oid);	/* cause target OID to be allocated */
 }
+
+#endif	/* !XLOG */

src/backend/access/transam/xlog.c

@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.22 2000/10/28 16:20:54 vadim Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.23 2000/11/03 11:39:35 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -157,6 +157,7 @@ typedef struct CheckPoint
 } CheckPoint;
 
 #define XLOG_CHECKPOINT		0x00
+#define XLOG_NEXTOID		0x10
 
 /*
  * We break each log file in 16Mb segments
@@ -1373,10 +1374,9 @@ StartupXLOG()
 		elog(LOG, "Invalid NextTransactionId/NextOid");
 #endif
 
-#ifdef XLOG_2
 	ShmemVariableCache->nextXid = checkPoint.nextXid;
 	ShmemVariableCache->nextOid = checkPoint.nextOid;
-#endif
+	ShmemVariableCache->oidCount = 0;
 
 	ThisStartUpID = checkPoint.ThisStartUpID;
 
@@ -1430,10 +1430,8 @@ StartupXLOG()
 				 ReadRecPtr.xlogid, ReadRecPtr.xrecoff);
 			do
 			{
-#ifdef XLOG_2
 				if (record->xl_xid >= ShmemVariableCache->nextXid)
 					ShmemVariableCache->nextXid = record->xl_xid + 1;
-#endif
 				if (XLOG_DEBUG)
 				{
 					char	buf[8192];
@@ -1609,6 +1607,9 @@ CreateCheckPoint(bool shutdown)
 	SpinRelease(XidGenLockId);
 	SpinAcquire(OidGenLockId);
 	checkPoint.nextOid = ShmemVariableCache->nextOid;
+	if (!shutdown)
+		checkPoint.nextOid += ShmemVariableCache->oidCount;
+
 	SpinRelease(OidGenLockId);
 
 	FlushBufferPool();
@@ -1647,13 +1648,32 @@ CreateCheckPoint(bool shutdown)
 	return;
 }
 
+void XLogPutNextOid(Oid nextOid);
+
+void
+XLogPutNextOid(Oid nextOid)
+{
+	(void) XLogInsert(RM_XLOG_ID, XLOG_NEXTOID, 
+					(char *) &nextOid, sizeof(Oid), NULL, 0);
+}
+
 void xlog_redo(XLogRecPtr lsn, XLogRecord *record);
 void xlog_undo(XLogRecPtr lsn, XLogRecord *record);
 void xlog_desc(char *buf, uint8 xl_info, char* rec);
 
 void
 xlog_redo(XLogRecPtr lsn, XLogRecord *record)
 {
+	uint8	info = record->xl_info & ~XLR_INFO_MASK;
+
+	if (info == XLOG_NEXTOID)
+	{
+		Oid		nextOid;
+
+		memcpy(&nextOid, XLogRecGetData(record), sizeof(Oid));
+		if (ShmemVariableCache->nextOid < nextOid)
+			ShmemVariableCache->nextOid = nextOid;
+	}
 }
 
 void
@@ -1677,6 +1697,13 @@ xlog_desc(char *buf, uint8 xl_info, char* rec)
 			checkpoint->nextOid,
 			(checkpoint->Shutdown) ? "shutdown" : "online");
 	}
+	else if (info == XLOG_NEXTOID)
+	{
+		Oid		nextOid;
+
+		memcpy(&nextOid, rec, sizeof(Oid));
+		sprintf(buf + strlen(buf), "nextOid: %u", nextOid);
+	}
 	else
 		strcat(buf, "UNKNOWN");
 }

src/backend/access/transam/xlog_varsup.c

@@ -0,0 +1,142 @@
+/*-------------------------------------------------------------------------
+ *
+ * varsup.c
+ *	  postgres OID & XID variables support routines
+ *
+ * Copyright (c) 2000, PostgreSQL, Inc
+ *
+ * IDENTIFICATION
+ *	  $Header: /cvsroot/pgsql/src/backend/access/transam/Attic/xlog_varsup.c,v 1.1 2000/11/03 11:39:35 vadim Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "access/transam.h"
+#include "storage/proc.h"
+
+SPINLOCK OidGenLockId;
+
+extern SPINLOCK XidGenLockId;
+extern void XLogPutNextOid(Oid nextOid);
+
+/* pointer to "variable cache" in shared memory (set up by shmem.c) */
+VariableCache ShmemVariableCache = NULL;
+
+void
+GetNewTransactionId(TransactionId *xid)
+{
+	/*
+	 * During bootstrap initialization, we return the special
+	 * bootstrap transaction id.
+	 */
+	if (AMI_OVERRIDE)
+	{
+		*xid = AmiTransactionId;
+		return;
+	}
+
+	SpinAcquire(XidGenLockId);
+	*xid = ShmemVariableCache->nextXid;
+	(ShmemVariableCache->nextXid)++;
+
+	if (MyProc != (PROC *) NULL)
+		MyProc->xid = *xid;
+
+	SpinRelease(XidGenLockId);
+
+}
+
+/*
+ * Like GetNewTransactionId reads nextXid but don't fetch it.
+ */
+void
+ReadNewTransactionId(TransactionId *xid)
+{
+
+	/*
+	 * During bootstrap initialization, we return the special
+	 * bootstrap transaction id.
+	 */
+	if (AMI_OVERRIDE)
+	{
+		*xid = AmiTransactionId;
+		return;
+	}
+
+	SpinAcquire(XidGenLockId);
+	*xid = ShmemVariableCache->nextXid;
+	SpinRelease(XidGenLockId);
+
+}
+
+/* ----------------------------------------------------------------
+ *					object id generation support
+ * ----------------------------------------------------------------
+ */
+
+#define VAR_OID_PREFETCH		8192
+static Oid lastSeenOid = InvalidOid;
+
+void
+GetNewObjectId(Oid *oid_return)
+{
+	SpinAcquire(OidGenLockId);
+
+	/* If we run out of logged for use oids then we log more */
+	if (ShmemVariableCache->oidCount == 0)
+	{
+		XLogPutNextOid(ShmemVariableCache->nextOid + VAR_OID_PREFETCH);
+		ShmemVariableCache->oidCount = VAR_OID_PREFETCH;
+	}
+
+	if (PointerIsValid(oid_return))
+		lastSeenOid = (*oid_return) = ShmemVariableCache->nextOid;
+
+	(ShmemVariableCache->nextOid)++;
+	(ShmemVariableCache->oidCount)--;
+
+	SpinRelease(OidGenLockId);
+}
+
+void
+CheckMaxObjectId(Oid assigned_oid)
+{
+
+	if (lastSeenOid != InvalidOid && assigned_oid < lastSeenOid)
+		return;
+
+	SpinAcquire(OidGenLockId);
+	if (assigned_oid < ShmemVariableCache->nextOid)
+	{
+		lastSeenOid = ShmemVariableCache->nextOid - 1;
+		SpinRelease(OidGenLockId);
+		return;
+	}
+
+	/* If we are in the logged oid range, just bump nextOid up */
+	if (assigned_oid <= ShmemVariableCache->nextOid + 
+						ShmemVariableCache->oidCount - 1)
+	{
+		ShmemVariableCache->oidCount -= 
+			assigned_oid - ShmemVariableCache->nextOid + 1;
+		ShmemVariableCache->nextOid = assigned_oid + 1;
+		SpinRelease(OidGenLockId);
+		return;
+	}
+
+	/*
+	 * We have exceeded the logged oid range.
+	 * We should lock the database and kill all other backends
+	 * but we are loading oid's that we can not guarantee are unique
+	 * anyway, so we must rely on the user.
+	 */
+
+	XLogPutNextOid(assigned_oid + VAR_OID_PREFETCH);
+	ShmemVariableCache->oidCount = VAR_OID_PREFETCH - 1;
+	ShmemVariableCache->nextOid = assigned_oid + 1;
+
+	SpinRelease(OidGenLockId);
+
+}

src/include/access/transam.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: transam.h,v 1.25 2000/10/28 16:20:59 vadim Exp $
+ * $Id: transam.h,v 1.26 2000/11/03 11:39:36 vadim Exp $
  *
  *	 NOTES
  *		Transaction System Version 101 now support proper oid
@@ -136,10 +136,12 @@ typedef VariableRelationContentsData *VariableRelationContents;
  */
 typedef struct VariableCacheData
 {
+#ifndef XLOG
 	uint32		xid_count;
+#endif
 	TransactionId nextXid;
-	uint32		oid_count;		/* not implemented, yet */
 	Oid			nextOid;
+	uint32		oidCount;
 } VariableCacheData;
 
 typedef VariableCacheData *VariableCache;