Have to lock buffer while changing page' LSN.

Thanks to Tom.

diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 00a96a99a5ac2907e8151373f715ef7d2cf8dd0c..fac2fb30de27c6135dcc8789002270f936649a17 100644 (file)
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *   $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.53 2001/04/03 21:58:00 vadim Exp $
+ *   $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.54 2001/04/04 15:43:25 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -181,13 +181,13 @@ DefineSequence(CreateSeqStmt *seq)
    /* Now - form & insert sequence tuple */
    tuple = heap_formtuple(tupDesc, value, null);
    heap_insert(rel, tuple);
-   ReleaseBuffer(buf);
 
    /*
     * After crash REDO of heap_insert above would re-init page and
     * our magic number would be lost. We have to log sequence creation.
     * This means two log records instead of one -:(
     */
+   LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
    START_CRIT_SECTION();
    {
        xl_seq_rec          xlrec;
@@ -217,6 +217,8 @@ DefineSequence(CreateSeqStmt *seq)
    }
    END_CRIT_SECTION();
 
+   LockBuffer(buf, BUFFER_LOCK_UNLOCK);
+   ReleaseBuffer(buf);
    heap_close(rel, AccessExclusiveLock);
 }