Csharp/C Sharp/Thread/Monitor

Monitor: Enter

<source lang="csharp"> using System; using System.Threading;

public class EnterExit {

   private int result = 0;
   public void NonCriticalSection() {
       Console.WriteLine("Entered Thread " + Thread.CurrentThread.GetHashCode());
       for (int i = 1; i <= 5; i++) {
           Console.WriteLine("Result = " + result++ + "  ThreadID "
                             + Thread.CurrentThread.GetHashCode());
           Thread.Sleep(1000);
       }
       Console.WriteLine("Exiting Thread " + Thread.CurrentThread.GetHashCode());
   }
   public void CriticalSection() {
       Monitor.Enter(this);
       Console.WriteLine("Entered Thread " + Thread.CurrentThread.GetHashCode());
       for (int i = 1; i <= 5; i++) {
           Console.WriteLine("Result = " + result++ + "  ThreadID " +
                             Thread.CurrentThread.GetHashCode());
           Thread.Sleep(1000);
       }
       Console.WriteLine("Exiting Thread " + Thread.CurrentThread.GetHashCode());
       Monitor.Exit(this);
   }
   public static void Main(String[] args) {
       EnterExit e = new EnterExit();
       Thread nt1 = new Thread(new ThreadStart(e.NonCriticalSection));
       nt1.Start();
       Thread nt2 = new Thread(new ThreadStart(e.NonCriticalSection));
       nt2.Start();
       Thread ct1 = new Thread(new ThreadStart(e.CriticalSection));
       ct1.Start();
       Thread ct2 = new Thread(new ThreadStart(e.CriticalSection));
       ct2.Start();
   }

}

</source>

Monitor.Pulse

<source lang="csharp"> using System; using System.Threading; class MessageBoard {

   private String messages = "no messages";
   public void Reader() {
       try {
           Monitor.Enter(this);
           if (messages == "no messages") {
               Console.WriteLine("{0} {1}",Thread.CurrentThread.Name, messages);
               Console.WriteLine("{0} waiting",Thread.CurrentThread.Name);
               Monitor.Wait(this);
           }
           Console.WriteLine("{0} {1}",Thread.CurrentThread.Name, messages);
       } finally {
           Monitor.Exit(this);
       }
   }
   public void Writer() {
       try {
           Monitor.Enter(this);
           messages = "Greetings!";
           Console.WriteLine("{0} Done writing message",Thread.CurrentThread.Name);
           Monitor.Pulse(this);
       } finally {
           Monitor.Exit(this);
       }
   }
   public static void Main() {
       MessageBoard myMessageBoard = new MessageBoard();
       Thread reader = new Thread(new ThreadStart(myMessageBoard.Reader));
       reader.Name = "ReaderThread:";
       Thread writer = new Thread(new ThreadStart(myMessageBoard.Writer));
       writer.Name = "WriterThread:";
       reader.Start();
       writer.Start();
   }

}

</source>

Monitor.TryEnter

<source lang="csharp">

using System; using System.Threading; public class TryEnter {

   public void CriticalSection() {
       bool b = Monitor.TryEnter(this, 1000);
       Console.WriteLine("Thread " +
                         Thread.CurrentThread.GetHashCode() +
                         " TryEnter Value " + b);
       for (int i = 1; i <= 3; i++) {
           Thread.Sleep(1000);
           Console.WriteLine(i + " " +
                             Thread.CurrentThread.GetHashCode() + " ");
       }
       Monitor.Exit(this);
   }
   public static void Main() {
       TryEnter a = new TryEnter();
       Thread t1 = new Thread(new ThreadStart(a.CriticalSection));
       Thread t2 = new Thread(new ThreadStart(a.CriticalSection));
       t1.Start();
       t2.Start();
   }

}

</source>