bk commit into 4.1 tree (jimw:1.2464) BUG#11796

[Jim Winstead]

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4.1 repository of jimw. When jimw does a push these changes will
be propagated to the main repository and, within 24 hours after the
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ChangeSet
  1.2464 05/11/01 11:48:55 jimw@stripped +1 -0
  Avoid possible race condition in accessing slave statistics
  during shutdown. (Bug #11796)

  sql/sql_show.cc
    1.206 05/11/01 11:48:53 jimw@stripped +7 -4
    Check that active_mi is not NULL before accessing its members.

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	jimw
# Host:	rama.(none)
# Root:	/home/jimw/my/mysql-4.1-11796

--- 1.205/sql/sql_show.cc	2005-10-03 11:48:48 -07:00
+++ 1.206/sql/sql_show.cc	2005-11-01 11:48:53 -08:00
@@ -1890,7 +1890,7 @@
       case SHOW_SLAVE_RUNNING:
       {
 	pthread_mutex_lock(&LOCK_active_mi);
-	end= strmov(buff, (active_mi->slave_running &&
+	end= strmov(buff, (active_mi && active_mi->slave_running &&
 			   active_mi->rli.slave_running) ? "ON" : "OFF");
 	pthread_mutex_unlock(&LOCK_active_mi);
 	break;
@@ -1902,9 +1902,12 @@
           SLAVE STATUS, and have the sum over all lines here.
         */
 	pthread_mutex_lock(&LOCK_active_mi);
-        pthread_mutex_lock(&active_mi->rli.data_lock);
-	end= int10_to_str(active_mi->rli.retried_trans, buff, 10);
-        pthread_mutex_unlock(&active_mi->rli.data_lock);
+        if (active_mi)
+        {
+          pthread_mutex_lock(&active_mi->rli.data_lock);
+          end= int10_to_str(active_mi->rli.retried_trans, buff, 10);
+          pthread_mutex_unlock(&active_mi->rli.data_lock);
+        }
 	pthread_mutex_unlock(&LOCK_active_mi);
 	break;
       }