MDL patch

diff --git a/sql/table_cache.cc b/sql/table_cache.cc
index 95a169d..d6f20bd 100644
--- a/sql/table_cache.cc
+++ b/sql/table_cache.cc
@@ -522,7 +522,7 @@ void tdc_purge(bool all)
       continue;
     }
     mysql_mutex_unlock(&LOCK_unused_shares);
-
+    share->tdc->wait_for_mdl_deadlock_detector();
     tdc_delete_share_from_hash(element);
   }
   DBUG_VOID_RETURN;
@@ -791,6 +791,7 @@ void tdc_release_share(TABLE_SHARE *share)
   if (share->tdc->flushed || tdc_records() > tdc_size)
   {
     mysql_mutex_unlock(&LOCK_unused_shares);
+    share->tdc->wait_for_mdl_deadlock_detector();
     tdc_delete_share_from_hash(share->tdc);
     DBUG_VOID_RETURN;
   }
@@ -878,7 +879,7 @@ bool tdc_remove_table(THD *thd, enum_tdc_remove_table_type remove_type,
       element->share->next= 0;
     }
     mysql_mutex_unlock(&LOCK_unused_shares);
-
+    element->wait_for_mdl_deadlock_detector();
     tdc_delete_share_from_hash(element);
     DBUG_RETURN(true);
   }