void
JvmtiEventController::env_dispose(JvmtiEnvBase *env) {

  {- -------------------------------------------
  (1) JvmtiEventControllerPrivate::env_dispose() を呼び出す.

      (なお, HotSpot の起動時(= Threads::number_of_threads() が 0)であれば
       ロックは必要ない(というかロック機構自体が立ち上がっていない)のでロックを取らずに呼び出す.
       そうでなければ JvmtiThreadState_lock を確保した状態で呼び出す.)
      ---------------------------------------- -}

      if (Threads::number_of_threads() == 0) {
        // during early VM start-up locks don't exist, but we are safely single threaded,
        // call the functionality without holding the JvmtiThreadState_lock.
        JvmtiEventControllerPrivate::env_dispose(env);
      } else {
        MutexLocker mu(JvmtiThreadState_lock);
        JvmtiEventControllerPrivate::env_dispose(env);
      }
    }