Wait Handles

using System;
using System.Threading;

class Demonstration
{
    static void Main()
    {
        new EventWaitHandleExample().runTest();
    }
}

public class EventWaitHandleExample
{
    EventWaitHandle ewh = new EventWaitHandle(false, EventResetMode.ManualReset);
    EventWaitHandle done = new EventWaitHandle(false, EventResetMode.AutoReset);


    void work(int num)
    {
        ewh.WaitOne();
        Console.WriteLine(num * num);

        done.Set();
    }

    public void runTest()
    {

        Thread t1 = new Thread(()=> {
            work(5);
        });

        Thread t2 = new Thread(() => {
            work(10);
        });

        t1.Start();
        t2.Start();

        Thread.Sleep(1000);


        WaitHandle.SignalAndWait(ewh, done);

        Console.WriteLine("Main thread exiting");

        t1.Join();
        t2.Join();

    }
}