Question

I stop a thread execution with .Abort() and .Join() for wait the thread terminates. But the problem is that .Join() never unblock application, same when thread was terminated. Why? my code:

  th.Abort();
  Console.WriteLine("request sent, please wait..");
  th.Join();
  Console.WriteLine("done!");

the above code never unlock application, but it works fine:

th.Abort();
Console.WriteLine("request sent, please wait..");
while (serverTh.ThreadState != ThreadState.Aborted) {
          Thread.Sleep(500);
 }
 Console.WriteLine("done!");

Thanks in advance.

Answer 1

What’s going on in the thread that you are trying to abort? For instance, this works fine:

    public static void Main(String[] args)
    {
        var t = new Thread(LoopForever);
        t.Start();
        Thread.Sleep(500);
        Console.WriteLine("request sent, please wait..");
        t.Abort();
        t.Join();
        Console.WriteLine("done!");
        Console.ReadLine();
    }

    public static void LoopForever()
    {
        Console.WriteLine("Running!");
        while (true)
        {
            Thread.Sleep(100);
            Console.WriteLine("Running!");
        }
    }

The only thing that comes to mind is maybe your background thread is catching the AbortException and then calling ResetAbort on itself:

    public static void Main(String[] args)
    {
        var t = new Thread(LoopForever);
        t.Start();
        // Let the thread get started...
        Thread.Sleep(500);
        Console.WriteLine("request sent, please wait..");
        t.Abort();
        t.Join();
        Console.WriteLine("done!");
        Console.ReadLine();
    }

    public static void LoopForever()
    {
            Console.WriteLine("Running!");
            while (true)
            {
                try
                {
                    Console.WriteLine("Running!");
                    Thread.Sleep(100);
                }
                catch (ThreadAbortException ex)
                {
                    Console.WriteLine("Alas, I was aborted!");
                    Thread.ResetAbort();
                    Console.WriteLine("But behold, I live!");
                }
            }
    }