线程问题

Question

    public void Start()
        {
             
            this.m_hWorkThreadRang = new Thread(new ThreadStart(this.Fun1));
            this.m_hWorkThreadRang.IsBackground = true;
            this.m_hWorkThreadRang.Start();
            this.m_hWorkThreadZoudi = new Thread(new ThreadStart(this.Fun2));
            this.m_hWorkThreadZoudi.IsBackground = true;
            this.m_hWorkThreadZoudi.Start();
        }
   private void Fun1()
        {
            string strData = "";
            int num2 = 0;
            DateTime now = DateTime.Now;
            while (true)
            {
                 
                try
                {
                    TimeSpan span = (TimeSpan)(DateTime.Now - now);                    //每隔6秒抓一次
                    num2 =6000 - ((int)span.TotalMilliseconds);
                }
                catch (Exception)
                {
                    num2 = 300;
                }
                now = DateTime.Now;
                if (num2 <= 0)
                {
                    num2 = 300;
                }
                Thread.Sleep(num2);
          
                try
                {
                    
                      
                    
                  
                        
                     http d=new http();
                     d.Cookie = this.m_strCookie;
                     d.URL = this.a.hosturl + "/data.aspx?Market=t";
                        d.Referer = this.a.hosturl;
                        d.Command = "GET";                strData=d.Getit(); 
                    Util.WriteIniappends("sb.txt", string.Format("{0:yyyy-MM-dd HH:mm:ss}", DateTime.Now)+" 地址1抓取！");
                 
                    }
               
                catch (Exception exception)
                {
                   
                }
            }
        }  private void Fun2()
        {
            string strData = "";
            DateTime now = DateTime.Now;
            int num;
            while (true)
            {
               
                try
                {
                    TimeSpan span = (TimeSpan)(DateTime.Now - now);
                    //隔两秒抓一次
                    num = 2000 - ((int)span.TotalMilliseconds);
                }
                catch (Exception)
                {
                    num = 100;
                }
                now = DateTime.Now;
                if (num <= 0)
                {
                    num = 100;
                }
                Thread.Sleep(num);
                try
                {
                     
                        http d = new http();
                        d.Cookie = this.m_strCookie;
                        d.URL = this.a.hosturl + "/data.aspx?Market=l";
                        d.Referer =     this.a.hosturl;
                        d.Command = "GET";
                        strData = d.Getit();
                      
                            Util.WriteIniappends("sb.txt", string.Format("{0:yyyy-MM-dd HH:mm:ss}", DateTime.Now) + " 地址2抓取！");
                        
                    
                }
                catch (Exception exception)
                {
                    
                }
            }
        }
当我运行start()方法时，出现问题，FUN1两次数据抓取都没有间隔6秒，FUN2也没有间隔2秒，为什么？第二个问题就是为什么两个线程没有按我设想的顺序抓取，有点杂乱无章的感觉，记录的结果如下：2011-05-31 10:02:01 地址1抓取！
2011-05-31 10:02:01 地址2抓取！
2011-05-31 10:02:05 地址2抓取！
2011-05-31 10:02:05 地址1抓取！
2011-05-31 10:02:05 地址2抓取！
2011-05-31 10:02:07 地址2抓取！
2011-05-31 10:02:07 地址1抓取！
2011-05-31 10:02:08 地址2抓取！
2011-05-31 10:02:10 地址2抓取！
2011-05-31 10:02:10 地址2抓取！
2011-05-31 10:02:12 地址1抓取！
2011-05-31 10:02:12 地址2抓取！
2011-05-31 10:02:12 地址2抓取！
2011-05-31 10:02:14 地址1抓取！
2011-05-31 10:02:14 地址2抓取！
2011-05-31 10:02:14 地址2抓取！
2011-05-31 10:02:16 地址2抓取！
2011-05-31 10:02:17 地址2抓取！
2011-05-31 10:02:18 地址1抓取！
2011-05-31 10:02:19 地址2抓取！
2011-05-31 10:02:19 地址2抓取！
2011-05-31 10:02:20 地址1抓取！
2011-05-31 10:02:21 地址2抓取！
2011-05-31 10:02:21 地址2抓取！
2011-05-31 10:02:23 地址2抓取！
2011-05-31 10:02:23 地址2抓取！
2011-05-31 10:02:24 地址1抓取！
2011-05-31 10:02:25 地址2抓取！
2011-05-31 10:02:26 地址2抓取！
2011-05-31 10:02:26 地址1抓取！
2011-05-31 10:02:28 地址2抓取！
2011-05-31 10:02:28 地址2抓取！
2011-05-31 10:02:30 地址2抓取！
2011-05-31 10:02:30 地址2抓取！
2011-05-31 10:02:30 地址1抓取！

Answer 1

第二个问题，用WaitHandle来同步
其实要按顺序执行，何必分两个线程，而且同样的方法还写了两次...

Answer 2

在某一个时间点，线程是否执行，是有CPU决定的，你可以认为是随机的，，，执行的频率由线程的优先级决定

Answer 3

 private void Fun1()
        {
            string strData = "";
            while (true)
            {
                Thread.Sleep(6000);
          
                try
                {
     
                     http d=new http();
                     d.Cookie = this.m_strCookie;
                     d.URL = this.a.hosturl + "/data.aspx?Market=t";
                        d.Referer = this.a.hosturl;
                        d.Command = "GET";                strData=d.Getit(); 
                    Util.WriteIniappends("sb.txt", string.Format("{0:yyyy-MM-dd HH:mm:ss}", DateTime.Now)+" 地址1抓取！");
                 
                    }
               
                catch (Exception exception)
                {
                   
                }
            }
        }

Answer 4

第二个问题：WaitHandle来实现。

Answer 5

优先级完全相同，CPU是死的，但人的活的啊，如何同步，求正解

Answer 6

http://msdn.microsoft.com/zh-cn/library/system.threading.waithandle%28VS.80%29.aspx用法在这里，去看看吧。

Answer 7

直接用timer不好么，为什么非用sleep

Answer 8

定义两个AutoResetEvent ：
AutoResetEvent are1 = new AutoResetEvent(false);
AutoResetEvent are2 = new AutoResetEvent(false);
f1()//方法一
{
  while(true)
  {
    are1.WaitOne();
    //TODO：执行操作
     are2.Set();
  }
}
f2()//方法二
{
  while(true)
  {
    are2.WaitOne();
    //TODO：执行操作
     are1.Set();
  }
}
在线程Start之后手动调用are1.Set() 就可以让f1()方法先执行了，然后，，然后

Answer 9

按楼主的意思
第一个问题时间间隔
                  now = DateTime.Now;
                if (num2 <= 0)
                {
                    num2 = 300;
                }
                Thread.Sleep(num2);
now = DateTime.Now应该放在Thread.Sleep(num2);之后Thread.Sleep(num2);
now = DateTime.Now;第二个问题，不知道你设想的什么样。可以用两个事件彼此制约，但要小心死锁。