Solución al ejercicio propuesto de Threads "pang-ping-pong-pung"

using System;
using System.Threading;

namespace PangPingPongPung
{


public class Contador
{
 const int NUM_HILOS=4;
 private int Turno;
 private string[] Mensajes={"pang", "ping", "pong", "pung"};

 public Contador(int Turno)
 {
  this.Turno=Turno;
 }
  
 public void Incrementar()
 {
  Turno++;
 }

 public string ValorActual()
 {
  return (Turno%NUM_HILOS).ToString();
 }

 public string MensajeActual()
 {
  return Mensajes[Turno%NUM_HILOS];
 }

}

class Program

{
 private Contador c;
 const int NUM_HILOS=4;
 public Program(int turnoInicial)
 {
  Thread [] vThreads=new Thread[4];
  c=new Contador(turnoInicial);
  for (int I=0; I<NUM_HILOS; I++) {
   vThreads[I]=new Thread(new ThreadStart(pangpingpongpung));
   vThreads[I].Name=I.ToString();
   vThreads[I].Start();
   if (I<NUM_HILOS-1)
    vThreads[I].Join(20);
   else
    vThreads[I].Join(10000);
  }
  for (int I=0; I<NUM_HILOS; I++)
   vThreads[I].Abort();
 
  Console.Write("Press any key to continue . . . ");
  Console.ReadKey(true);
 }

 public static void Main(string[] args)
 {
  Program p=new Program(0);
 }




 public void pangpingpongpung()
 {
  while (true) {
   Monitor.Enter(c);
   try{
    if (Thread.CurrentThread.Name==c.ValorActual()) {
     Console.WriteLine(c.MensajeActual());
     c.Incrementar();
     int esperaAleatoria=new Random(
           DateTime.Now.Millisecond).Next()%500;
     Thread.Sleep(esperaAleatoria);
    }
   }
   finally {
    Monitor.Exit(c);
   }
  }
 }
}
}