多线程如何同步？

[mulinyeyu]

我定义两个线程，如果不加lock锁定，数据有可能重复，但加上lock又达不到同步执行的效果。我该怎么改呢

[宝_爸]

只lock需要lock的地方。

[SocketUpEx]

哪里会有同步哦
就算不加lock也不可能同步的

[mulinyeyu]

我把代码贴出来，希望大牛们帮我看看

 public Form1()
        {
            InitializeComponent();
            threadOne = new Thread(new ThreadStart(Run));
            threadTwo = new Thread(new ThreadStart(Run));
            threadThree = new Thread(new ThreadStart(Run));
            dele_display = new displayOnlineComputer(displayComputerStatus);
        }

       
        private List<string> ticketList;
        private object objLock = new object();
        private delegate void ListBoxCallBack();
        private delegate void LableCallBack();
        private void button1_Click(object sender, EventArgs e)
        {
            Start();
        }

        public void Start()
        {
            ticketList = new List<string>(10);
            for (int i = 1; i <= 10; i++)
            {
                ticketList.Add(i.ToString());
            }
           
            threadOne.Start();
            threadTwo.Start();
            threadThree.Start();
           
        }
        private void displayComputerStatus(int on,int off) 
        {
            label1.Text = on.ToString();
            label2.Text = off.ToString();
        }
        private void Run()
        {
            int num=0;
            while (ticketList.Count > 0)
            {

                Monitor.Enter(objLock);

                if (ticketList.Count > 0)
                {
                    string ticketNo = IcmpPacket.PingHost("192.168.0.9",64);
                    if(ticketNo.Contains("192.168.0.9"))
                    {
                        num++;
                        LableCallBack lblCallBack = delegate()
                        {
                            label1.Text = num.ToString();
                        };
                        label1.Invoke(lblCallBack);
                    }
                    ListBoxCallBack callBack = delegate()
                    {
                        richTextBox1.Text += ticketNo + "\n";

                      
                    };
                    richTextBox1.Invoke(callBack);
                   
                    ticketList.RemoveAt(0);
                    Thread.Sleep(1000);
                }
                Monitor.Exit(objLock);
              
            }
        }

[欢乐的小猪]

多线程同步用信号量吧。