Fix nbtree's failure to clear BTScans list during xact abort.

Also, move responsibility for calling vc_abort into main xact.c list of
things-to-call-at-abort.  What in the world was it doing down inside of
TransactionIdAbort()?

src/backend/access/nbtree/nbtpage.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtpage.c,v 1.30 1999/07/17 20:16:42 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtpage.c,v 1.31 1999/08/08 20:12:50 tgl Exp $
  *
  *	NOTES
  *	   Postgres btree pages look like ordinary relation pages.	The opaque
@@ -42,7 +42,6 @@ typedef struct BTMetaPageData
 #define BTPageGetMeta(p) \
 	((BTMetaPageData *) &((PageHeader) p)->pd_linp[0])
 
-extern bool BuildingBtree;
 
 /*
  *	We use high-concurrency locking on btrees.	There are two cases in

src/backend/access/nbtree/nbtscan.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/access/nbtree/Attic/nbtscan.c,v 1.27 1999/07/15 23:03:00 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/access/nbtree/Attic/nbtscan.c,v 1.28 1999/08/08 20:12:51 tgl Exp $
  *
  *
  * NOTES
@@ -43,6 +43,28 @@ static BTScanList BTScans = (BTScanList) NULL;
 
 static void _bt_scandel(IndexScanDesc scan, BlockNumber blkno, OffsetNumber offno);
 
+/*
+ * AtEOXact_nbtree() --- clean up nbtree subsystem at xact abort or commit.
+ *
+ * This is here because it needs to touch this module's static var BTScans.
+ */
+void
+AtEOXact_nbtree(void)
+{
+	/* Note: these actions should only be necessary during xact abort;
+	 * but they can't hurt during a commit.
+	 */
+
+	/* Reset the active-scans list to empty.
+	 * We do not need to free the list elements, because they're all
+	 * palloc()'d, so they'll go away at end of transaction anyway.
+	 */
+	BTScans = NULL;
+
+	/* If we were building a btree, we ain't anymore. */
+	BuildingBtree = false;
+}
+
 /*
  *	_bt_regscan() -- register a new scan.
  */

src/backend/access/transam/transam.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.30 1999/07/15 23:03:02 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.31 1999/08/08 20:12:52 tgl Exp $
  *
  * NOTES
  *	  This file contains the high level access-method interface to the
@@ -20,7 +20,6 @@
 
 #include "access/heapam.h"
 #include "catalog/catname.h"
-#include "commands/vacuum.h"
 
 static int	RecoveryCheckingEnabled(void);
 static void TransRecover(Relation logRelation);
@@ -83,12 +82,6 @@ int			RecoveryCheckingEnableState = 0;
  */
 extern int	OidGenLockId;
 
-/* ----------------
- *		globals that must be reset at abort
- * ----------------
- */
-extern bool BuildingBtree;
-
 
 /* ----------------
  *		recovery checking accessors
@@ -568,11 +561,6 @@ TransactionIdCommit(TransactionId transactionId)
 void
 TransactionIdAbort(TransactionId transactionId)
 {
-	BuildingBtree = false;
-
-	if (VacuumRunning)
-		vc_abort();
-
 	if (AMI_OVERRIDE)
 		return;
 

src/backend/access/transam/xact.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.46 1999/07/16 04:58:33 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.47 1999/08/08 20:12:52 tgl Exp $
  *
  * NOTES
  *		Transaction aborts can now occur two ways:
@@ -144,9 +144,11 @@
  */
 #include "postgres.h"
 
+#include "access/nbtree.h"
 #include "catalog/heap.h"
 #include "commands/async.h"
 #include "commands/sequence.h"
+#include "commands/vacuum.h"
 #include "libpq/be-fsstubs.h"
 #include "storage/proc.h"
 #include "utils/inval.h"
@@ -952,6 +954,7 @@ CommitTransaction()
 	}
 
 	RelationPurgeLocalRelation(true);
+	AtEOXact_nbtree();
 	AtCommit_Cache();
 	AtCommit_Locks();
 	AtCommit_Memory();
@@ -1013,9 +1016,12 @@ AbortTransaction()
 	AtAbort_Notify();
 	CloseSequences();
 	AtEOXact_portals();
+	if (VacuumRunning)
+		vc_abort();
 	RecordTransactionAbort();
 	RelationPurgeLocalRelation(false);
 	DestroyNoNameRels();
+	AtEOXact_nbtree();
 	AtAbort_Cache();
 	AtAbort_Locks();
 	AtAbort_Memory();

src/include/access/nbtree.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: nbtree.h,v 1.30 1999/07/16 17:07:27 momjian Exp $
+ * $Id: nbtree.h,v 1.31 1999/08/08 20:12:49 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -250,6 +250,7 @@ extern void btdelete(Relation rel, ItemPointer tid);
 extern void _bt_regscan(IndexScanDesc scan);
 extern void _bt_dropscan(IndexScanDesc scan);
 extern void _bt_adjscans(Relation rel, ItemPointer tid);
+extern void AtEOXact_nbtree(void);
 
 /*
  * prototypes for functions in nbtsearch.c