ha_blackhole changes, same patch as http://lists.mysql.com/internals/27878, per brian

sql/ha_blackhole.cc

@@ -124,14 +124,16 @@ int ha_blackhole::external_lock(THD *thd, int lock_type)
 }
 
 
+uint ha_blackhole::lock_count(void) const
+{
+  DBUG_RETURN(0);
+}
+
 THR_LOCK_DATA **ha_blackhole::store_lock(THD *thd,
                                          THR_LOCK_DATA **to,
                                          enum thr_lock_type lock_type)
 {
-  if (lock_type != TL_IGNORE && lock.type == TL_UNLOCK)
-    lock.type=lock_type;
-  *to++= &lock;
-  return to;
+  DEBUG_RETURN(to);
 }
 
 

sql/ha_blackhole.h

@@ -80,6 +80,7 @@ class ha_blackhole: public handler
   void position(const byte *record);
   void info(uint flag);
   int external_lock(THD *thd, int lock_type);
+  uint lock_count(void) const;
   int create(const char *name, TABLE *table_arg,
              HA_CREATE_INFO *create_info);
   THR_LOCK_DATA **store_lock(THD *thd,