Threads with semaphore and mutex and a variable #semaphore #threads #mutex

ThreadsWithSemaphoresWithMutex.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace Threading
{
  class Program
  {
    public static Semaphore semaphore = new Semaphore(2, 3);
    public static int number = 1;
    public static Mutex m = new Mutex();
    static void Main(string[] args)
    {
      Thread t;
      for (int i = 1; i <= 10; i++) {
        ThreadStart ts = delegate
        {
          Console.WriteLine(Thread.CurrentThread.Name + " Wants to Enter into Critical Section for processing");
          try {
            semaphore.WaitOne();
            bool moreWork = DoWork("param1", "param2", "param3");
            if (moreWork) {
              DoMoreWork("param1", "param2");
            }
          }
          finally {
            semaphore.Release();
          }
        };
        t = new Thread(ts);
        t.Name = "Thread " + i;
        t.Start();
        if (i == 10) {
          t.Join(); //Or else main thread will continue and print the number
        }
      }
      
      Console.WriteLine("number is: " + number);
      Console.ReadKey();
    }
    static bool DoWork(string s1, string s2, string s3)
    {
      Thread.Sleep(1000);

      m.WaitOne();
        if (number == 4)
          number--;
        else {
          number++;
        }
      m.ReleaseMutex();

      Console.Write(Thread.CurrentThread.Name + " says: ");
      Console.WriteLine(s1 + s2 + s3);
      return true;
    }

    static void DoMoreWork(string s1, string s2)
    {
      Thread.Sleep(1000);
      Console.Write(Thread.CurrentThread.Name + " says: ");
      Console.WriteLine(s1 + s2);
    }
  }
}