using System;

using System.Threading;         

public class Program

{

  static EventWaitHandle _ready = new AutoResetEvent (false);

  static EventWaitHandle _go = new AutoResetEvent (false);

  static readonly object _locker = new object();

  static string _message;

  public static void Main()

  {

      new Thread (Loop).Start();

      var lc1 = new Thread (new ParameterizedThreadStart(LoopCaller));

      var lc2 = new Thread (new ParameterizedThreadStart(LoopCaller));

      var lc3 = new Thread (new ParameterizedThreadStart(LoopCaller));

      lc3.Start("lc3");   

      lc2.Start("lc2");

      lc1.Start("lc1");

​

  }

  public static void LoopCaller(object name) {

    _ready.WaitOne();                  // First wait until worker is ready

    lock (_locker) _message = name.ToString();

    _go.Set();                         // Tell worker to go

  }

  public static void Loop()

  {

    while (true)

    {

      _ready.Set();                          // Indicate that we're ready

      _go.WaitOne();                         // Wait to be kicked off...

      lock (_locker)

      {

        Console.WriteLine (_message);

      }

    }

  }

}