/// <summary>

         /// 实例 Barrier 类

         /// </summary>

         public static Barrier _barrier = new Barrier(, b => Console.WriteLine($"第 {b.CurrentPhaseNumber + 1} 阶段结束"));

         /// <summary>

         /// 向 Barrier 发送信号

         /// </summary>

         /// <param name="name"></param>

         /// <param name="message"></param>

         /// <param name="seconds"></param>

         public static void PlayMusic(string name, string message, int seconds)

         {

             for (int i = ; i < ; i++)

             {

                 Console.WriteLine("------------------------");

                 System.Threading.Thread.Sleep(TimeSpan.FromSeconds(seconds));

                 Console.WriteLine($"{name} 开始 {message}");

                 System.Threading.Thread.Sleep(TimeSpan.FromSeconds(seconds));

                 Console.WriteLine($"{name} 结束 {message}");

                 // 回调函数 打印出阶段

                 _barrier.SignalAndWait();

             }

         }

 /// <summary>

         /// 执行

         /// </summary>

         public static void Implement()

         {

             var t1 = new System.Threading.Thread(() => PlayMusic("吉他手", "奏曲", ));

             var t2 = new System.Threading.Thread(() => PlayMusic("歌手", "唱他的歌", ));

             t1.Start();

             t2.Start();

         }