void SATBMarkQueueSet::handle_zero_index_for_thread(JavaThread* t) {

  {- -------------------------------------------
  (1) (verify)
      ---------------------------------------- -}

      DEBUG_ONLY(t->satb_mark_queue().verify_oops_in_buffer();)

  {- -------------------------------------------
  (1) PtrQueue::handle_zero_index() を呼び出すだけ.
      ---------------------------------------- -}

      t->satb_mark_queue().handle_zero_index();
    }