/* The actual shutdown sequence is defined here.
     *
     * If it weren't for runFinalizersOnExit, this would be simple -- we'd just
     * run the hooks and then halt.  Instead we need to keep track of whether
     * we're running hooks or finalizers.  In the latter case a finalizer could
     * invoke exit(1) to cause immediate termination, while in the former case
     * any further invocations of exit(n), for any n, simply stall.  Note that
     * if on-exit finalizers are enabled they're run iff the shutdown is
     * initiated by an exit(0); they're never run on exit(n) for n != 0 or in
     * response to SIGINT, SIGTERM, etc.
     */

    private static void sequence() {

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

            synchronized (lock) {
                /* Guard against the possibility of a daemon thread invoking exit
                 * after DestroyJavaVM initiates the shutdown sequence
                 */
                if (state != HOOKS) return;
            }

  {- -------------------------------------------
  (1) java.lang.Shutdown.runHooks() を呼んで, shutdown hook を実行する.
      ---------------------------------------- -}

            runHooks();

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

            boolean rfoe;

  {- -------------------------------------------
  (1) state を変更しておく
      ---------------------------------------- -}

            synchronized (lock) {
                state = FINALIZERS;
                rfoe = runFinalizersOnExit;
            }

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

            if (rfoe) runAllFinalizers();