void JavaThread::initialize_queues() {

  {- -------------------------------------------
  (1) (この関数では G1GC 用の初期化処理を行っている)
      ---------------------------------------- -}

  {- -------------------------------------------
  (1) (assert)
      ---------------------------------------- -}

      assert(!SafepointSynchronize::is_at_safepoint(),
             "we should not be at a safepoint");

  {- -------------------------------------------
  (1) (変数宣言など)
      ---------------------------------------- -}

      ObjPtrQueue& satb_queue = satb_mark_queue();
      SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set();

  {- -------------------------------------------
  (1) (assert)
      ---------------------------------------- -}

      // The SATB queue should have been constructed with its active
      // field set to false.
      assert(!satb_queue.is_active(), "SATB queue should not be active");
      assert(satb_queue.is_empty(), "SATB queue should be empty");

  {- -------------------------------------------
  (1) もし現在 ConcurrentMarkingThread が作業中であれば, 
      (その補佐用に SATB write barrier が必要なので)
      ObjPtrQueue::set_active() を呼んで
      このスレッド用の ObjPtrQueue でも SATB write barrier を有効にしておく.
      ---------------------------------------- -}

      // If we are creating the thread during a marking cycle, we should
      // set the active field of the SATB queue to true.
      if (satb_queue_set.is_active()) {
        satb_queue.set_active(true);
      }

  {- -------------------------------------------
  (1) (assert)
      ---------------------------------------- -}

      DirtyCardQueue& dirty_queue = dirty_card_queue();
      // The dirty card queue should have been constructed with its
      // active field set to true.
      assert(dirty_queue.is_active(), "dirty card queue should be active");
    }