[Mono-list] Problem with Thread.Abort()

[peter]

In my continuing journey through /"Mono: a developers' handbook"/, in 
the section in chapter 3 on threads, an example program calls 
Thread.Abort() to kill the thread previously created, and exit the 
program.  The code is as follows:

// 03-keyfunc/07-threading/UseThreadPool.cs
using System;
using System.IO;
using System.Threading;
public class UseThreadPool {
    private static Thread thread;
    public static void Main(string[] args) {
        WaitCallback callback = new WaitCallback(Callback);
        Console.WriteLine("Calling QueueUserWorkItem()...");
        ThreadPool.QueueUserWorkItem(callback);
        
        Console.WriteLine("Hit return to exit.");
        Console.In.ReadLine();
        
        thread.Abort();
        
        Console.WriteLine("Done.");
    }
    
    private static void Callback(object state) {
        thread = Thread.CurrentThread;
        
        Console.WriteLine("Started thread {0}", thread.GetHashCode());
        
        Random random = new Random();
        for (int counter = 0; true; counter++) {
            try {
                Thread.Sleep(random.Next(10000));
            } catch (ThreadAbortException) {
                Console.WriteLine("Aborting thread");
                // Environment.Exit(0);
            }
            Console.WriteLine("{0}: {1}", counter, DateTime.Now);
        }
    }
}
               
Obviously the expectation is that the call to Abort() will cause a 
ThreadAbortException to be raised in the delegate method.  However this 
doesn't happen for me.  Instead, the Main() method exits, but the thread 
continues:

[EMAIL PROTECTED]:~/monoDevelopersNotebook/03-keyfunc/07-threading> mono 
UseThreadPool.exe
Calling QueueUserWorkItem()...
Hit return to exit.
Started thread -1392333056
0: 08/04/2005 18:27:10
1: 08/04/2005 18:27:10

Done.
2: 08/04/2005 18:27:17
3: 08/04/2005 18:27:18
[EMAIL PROTECTED]:~/monoDevelopersNotebook/03-keyfunc/07-threading>
[Ctl]-C will stop the program, as you'd expect.
Is this a problem with me (likely), a problem with the book (possible), 
a problem with the Mono threading implementation (unlikely), or 
something I'm not bright enough to spot?

It's not the end of the world; but an explanation would be welcomed.  
Just to put my mind at rest.

Thanks
Peter

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