golang 进程怎么关闭

func worker(cancel chan struct{}) {
  for {
    select {
      //检查是否收到取消指令
      case <-cancel:
        log.Println("Worker: Stopping the work")
        return
      //正常工作逻辑
      default:
        log.Println("Worker: Doing some work")
        time.Sleep(time.Second * 1)
    }
  }
}

func main() {
  //创建取消通道
  cancel := make(chan struct{})
  
  //启动工作子进程
  go worker(cancel)
  
  //等待一段时间后取消工作
  time.Sleep(time.Second * 5)
  close(cancel)
  
  //等待程序退出
  time.Sleep(time.Second * 1)
}

func main() {
  //创建关闭信号
  stop := make(chan os.Signal, 1)
  signal.Notify(stop, os.Interrupt)
  
  //启动工作子进程
  go func() {
    for {
      log.Println("Worker: Doing some work")
      time.Sleep(time.Second * 1)
    }
  }()
  
  //等待收到关闭信号
  <-stop
  log.Println("Main: Got stop signal")
  
  //等待程序退出
  time.Sleep(time.Second * 1)
}

func main() {
  //创建关闭信号
  stop := make(chan os.Signal, 1)
  signal.Notify(stop, os.Interrupt, os.Kill)
  
  //创建TCP服务器
  listener, err := net.Listen("tcp", "localhost:8000")
  if err != nil {
    log.Fatal("Error:", err)
  }
  defer listener.Close()
  
  //启动RPC服务
  srv := rpc.NewServer()
  srv.Register(&MathService{})
  go srv.Accept(listener)
  
  //等待收到关闭信号
  <-stop
  log.Println("Main: Got stop signal")
  
  //关闭服务器
  log.Println("Main: Closing the server")
  listener.Close()
  
  //等待正在运行的任务完成
  log.Println("Main: Waiting for the tasks to finish")
  time.Sleep(time.Second * 3)
  
  //保存数据
  log.Println("Main: Saving the data")
  
  //等待程序退出
  time.Sleep(time.Second * 1)
}