Use a Mutex to control a shared resource against two current threads : Mutex « Thread


using System;  

using System.Threading;  

 

class MyCounter { 

  public static int count = 0; 

  public static Mutex MuTexLock = new Mutex(); 

} 

 

class IncThread {  

  public Thread thrd;  

  

  public IncThread() {  

    thrd = new Thread(this.run);  

    thrd.Start();  

  }  

  

  void run() {  

    Console.WriteLine("IncThread is waiting for the mutex."); 

 

    MyCounter.MuTexLock.WaitOne(); 

 

    Console.WriteLine("IncThread acquires the mutex."); 

    

    int num = 10;

    do {  

      Thread.Sleep(50);  

      MyCounter.count++;  

      Console.WriteLine("In IncThread, MyCounter.count is " + MyCounter.count);  

      num--; 

    } while(num > 0);  

  

    Console.WriteLine("IncThread releases the mutex.");   

 

    MyCounter.MuTexLock.ReleaseMutex(); 

  }  

}  

 

class DecThread {  

  public Thread thrd;  

  

  public DecThread() {  

    thrd = new Thread(new ThreadStart(this.run));  

    thrd.Start();  

  }  

  

  void run() {  

    Console.WriteLine("DecThread is waiting for the mutex."); 

 

    MyCounter.MuTexLock.WaitOne(); 

 

    Console.WriteLine("DecThread acquires the mutex."); 

 

    int num = 10;

    do {  

      Thread.Sleep(50);  

      MyCounter.count--;  

      Console.WriteLine("In DecThread, MyCounter.count is " + MyCounter.count);  

      num--; 

    } while(num > 0);  

  

    Console.WriteLine("DecThread releases the mutex.");  

 

    MyCounter.MuTexLock.ReleaseMutex(); 

  }  

}  

  

class MainClass {  

  public static void Main() {  

    IncThread mt1 = new IncThread();  

    DecThread mt2 = new DecThread();  

  

    mt1.thrd.Join(); 

    mt2.thrd.Join(); 

  }  

}

IncThread is waiting for the mutex. IncThread acquires the mutex. DecThread is waiting for the mutex. In IncThread, MyCounter.count is 1 In IncThread, MyCounter.count is 2 In IncThread, MyCounter.count is 3 In IncThread, MyCounter.count is 4 In IncThread, MyCounter.count is 5 In IncThread, MyCounter.count is 6 In IncThread, MyCounter.count is 7 In IncThread, MyCounter.count is 8 In IncThread, MyCounter.count is 9 In IncThread, MyCounter.count is 10 IncThread releases the mutex. DecThread acquires the mutex. In DecThread, MyCounter.count is 9 In DecThread, MyCounter.count is 8 In DecThread, MyCounter.count is 7 In DecThread, MyCounter.count is 6 In DecThread, MyCounter.count is 5 In DecThread, MyCounter.count is 4 In DecThread, MyCounter.count is 3 In DecThread, MyCounter.count is 2 In DecThread, MyCounter.count is 1 In DecThread, MyCounter.count is 0 DecThread releases the mutex.

Use a Mutex to control a shared resource against two current threads : Mutex « Thread « C# / CSharp Tutorial