Question

我对Thread有点问题。我执行函数Receive，超时设置为600，但它在此结束

if ((thr.ThreadState != ThreadState.Running) 
    && (thr.ThreadState != ThreadState.WaitSleepJoin))
{
  ThreadState st = thr.ThreadState;
  lg.WriteString("EXIT BY THREAD END");
  lg.WriteString("LAST: "+st.ToString());
  break;
}

只有当线程结束并且我已经收到所有数据时，函数才会结束，但是当我打开文件errores.txt时，我看到ThreadState值是Running或WaitSleepJoin。

知道该函数为什么会中止？

以下更多代码 - ＆gt;

bool exit = false;
void WaitAndRead() {
if (buffer == null)
  buffer = new List<byte>();
buffer.Clear();
try
{
  while (sock_client.Available < 1 && !exit)
    Thread.Sleep(10);
  while (sock_client.Available > 0 && !exit)
  {
    byte[] b = new byte[sock_client.Available];
    sock_client.Receive(b, 0, b.Length, SocketFlags.None);
    buffer.AddRange(b);
    Thread.Sleep(25);
  }
}
catch (Exception ex) 
{ 
  Log lg = new Log("C:\\TPV\\errores.txt"); 
  lg.WriteException(ex, true); 
}

public int Receive(int timeout,out List<byte> result) 
{
  result = new List<byte>();
  try
  {
    if (!Connected)
      return NOT_CONNECTED;
    bool ok = true;
    ThreadStart str = delegate 
    {
      try { WaitAndRead(); }
      catch (Exception ex) 
      { 
        Log lg = new Log("C:\\TPV\\errores.txt"); 
        lg.WriteException(ex, true); ok = false; }
      };
      exit = false;
      Thread thr = new Thread(str);
      thr.Start();
      int x = 0;
      int max = 10 * timeout;
      while (x < max)
      {
        Log lg = new Log("C:\\TPV\\errores.txt");
        if ((thr.ThreadState != ThreadState.Running) 
            && (thr.ThreadState != ThreadState.WaitSleepJoin))
        {
          ThreadState st = thr.ThreadState;
          lg.WriteString("EXIT BY THREAD END");
          lg.WriteString("LAST: "+st.ToString());
          break;
        }
        x++;
        Thread.Sleep(10);
      }
      exit = true;
      if (x >= max)
        return Timeout;
      result = new List<byte>(buffer.ToArray());
      return ok?OK:NOT_CONNECTED;
    }
    catch(Exception ex) 
    {
      Log lg = new Log("C:\\TPV\\errores.txt"); 
      lg.WriteException(ex, true);
      return NOT_CONNECTED;
    }
  }

Answer 1

在此代码评估时，ThreadState属性的值可能会发生变化：

if ((thr.ThreadState != ThreadState.Running) && (thr.ThreadState != ThreadState.WaitSleepJoin))
{
    ThreadState st = thr.ThreadState;
    lg.WriteString("EXIT BY THREAD END");
    lg.WriteString("LAST: "+st.ToString());
    break;
}

考虑以下情况：

thr.ThreadState是WaitSleepJoin
if语句的第一部分评估为true

thr.ThreadState

Running更改为if
if语句的第二部分评估为true
由于两个部分都评估为true，因此输入了if块

您可以尝试重写代码，如下所示，这样您只需检查一次ThreadState属性的值：

var state = thr.ThreadState;
if (state != ThreadState.Running && state != ThreadState.WaitSleepJoin)
{
    lg.WriteString("EXIT BY THREAD END");
    lg.WriteString("LAST: "+ state.ToString());
    break;
}

Answer 2

我注意到Microsoft的ThreadState属性的一些注释：
http://msdn.microsoft.com/en-us/library/system.threading.thread.threadstate.aspx

特别指出：

线程状态仅在调试方案中有用。你的代码永远不应该使用线程状态来同步活动线程。

您是否要考虑使用Monitor或Mutex对象？

线程正在退出

2 个答案: