void ThreadLocalStorage::pd_set_thread(Thread* thread) {

  {- -------------------------------------------
  (1) os::thread_local_storage_at_put() を呼んで Thread オブジェクトを登録
      ---------------------------------------- -}

      // Store the new value before updating the cache to prevent a race
      // between get_thread_via_cache_slowly() and this store operation.
      os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);

  {- -------------------------------------------
  (1) キャッシュも更新しておく
      ---------------------------------------- -}

      // Update thread cache with new thread if setting on thread create,
      // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit.
      uintptr_t raw = pd_raw_thread_id();
      int ix = pd_cache_index(raw);
      _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread;
    }