void VMThread::create() {

  {- -------------------------------------------
  (1) VMThread を生成する
      ---------------------------------------- -}

      assert(vm_thread() == NULL, "we can only allocate one VMThread");
      _vm_thread = new VMThread();

  {- -------------------------------------------
  (1) VMThread に VM Operation 要求を通知するための VMOperationQueue を生成する
      ---------------------------------------- -}

      // Create VM operation queue
      _vm_queue = new VMOperationQueue();
      guarantee(_vm_queue != NULL, "just checking");

  {- -------------------------------------------
  (1) VMThread の終了を待つための Monitor を生成する
      (See: VMThread::wait_for_vm_thread_exit())
      ---------------------------------------- -}

      _terminate_lock = new Monitor(Mutex::safepoint, "VMThread::_terminate_lock", true);

  {- -------------------------------------------
  (1) (プロファイル情報取得用の初期化処理) ("sun.threads.vmOperationTime") (See: PerfTraceTime)
      ---------------------------------------- -}

      if (UsePerfData) {
        // jvmstat performance counters
        Thread* THREAD = Thread::current();
        _perf_accumulated_vm_operation_time =
                     PerfDataManager::create_counter(SUN_THREADS, "vmOperationTime",
                                                     PerfData::U_Ticks, CHECK);
      }
    }