how to know if thread execution is terminated?

Question

I have a thread:

private void start_Click(object sender, EventArgs e) {
   //...
   Thread th = new Thread(DoWork);
   th.Start(); 
}

what's the best way to know if thread is terminated? I'm looking for an example code how do this. Thanks in advance.

score 5 · Answer 1 · answered Nov 17 '11 at 20:09

5

thread State

http://msdn.microsoft.com/en-us/library/system.threading.threadstate.aspx

answered Nov 17 '11 at 20:09

Royi Namir

138,711
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score 3 · Accepted Answer · answered Nov 18 '11 at 02:50

There are few simple things you can do.

You could use Thread.Join to see if the thread has ended.

var thread = new Thread(SomeMethod);
thread.Start();
while (!thread.Join(0)) // nonblocking
{
  // Do something else while the thread is still going.
}

And of course if you do not specify a timeout parameter then the calling thread will block until the worker thread ends.

You could also invoke a delegate or event at the end of entry point method.

// This delegate will get executed upon completion of the thread.
Action finished = () => { Console.WriteLine("Finished"); };

var thread = new Thread(
  () =>
  {
    try
    {
      // Do a bunch of stuff here.
    }
    finally
    {
      finished();
    }
  });
thread.Start();

Usually the callback methods will try to do a cross-thread operation like updating the UI specifying that the process is completed. If your UI controls doesn't support cross-thread operation you will get a InvalidOperationException saying the control is accessed from a thread other than the thread it was created on, which can be avoided by invoking the callback method like this `this.Invoke(finished);` — shanmuga raja, Mar 23 '17 at 22:06

score 2 · Answer 3 · answered Nov 17 '11 at 20:12

2

If you simply want to wait until the thread is finished you can use.

th.Join();

answered Nov 17 '11 at 20:12

harlam357

1,451
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score 0 · Answer 4 · answered Nov 17 '11 at 21:11

Simply use Thread.join() as harlam said. chech this link for more clearness: http://msdn.microsoft.com/en-us/library/95hbf2ta.aspx

Use this method to ensure a thread has terminated. The caller will block indefinitely if the thread does not terminate. If the thread has already terminated when Join is called, the method returns immediately.

how to know if thread execution is terminated?

4 Answers4

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