Csharp/C Sharp by API/System.Threading/Mutex

Mutex.ReleaseMutex()

  
using System;
using System.Threading;
class MainClass {
    public static void Main() {
        bool ownsMutex;
        using (Mutex mutex = new Mutex(true, "MutexExample", out ownsMutex)) {
            if (ownsMutex) {
                Console.ReadLine();
                mutex.ReleaseMutex();
            } else {
                Console.WriteLine("Another instance of this application " +
                    " already owns the mutex named MutexExample.");
            }
        }
    }
}

Mutex.WaitOne()

  
using System;
using System.Threading;
public class MainClass 
{
  private static int Runs = 0;
  static Mutex mtx;
  public static void CountUp() 
  {
    while (Runs < 10)
    {
      mtx.WaitOne();
      int Temp = Runs;
      Temp++;
      Console.WriteLine(Thread.CurrentThread.Name + " " + Temp);
      Thread.Sleep(1000);
      Runs = Temp;
      mtx.ReleaseMutex();
    } 
  }
  public static void Main() 
  {
    mtx = new Mutex(false, "RunsMutex");
    Thread t2 = new Thread(new ThreadStart(CountUp));
    t2.Name = "t2";
    Thread t3 = new Thread(new ThreadStart(CountUp));
    t3.Name = "t3";
    t2.Start();
    t3.Start();
  }
}