public static void reader()
 {
     while (true)
     {
         Console.WriteLine("reader waiting");
         RMutex.WaitOne();
         RCMutex.WaitOne();
         Rcount++;
         if (Rcount == 1)
         {
             WMutex.WaitOne();
         }
         RCMutex.Release();
         Console.WriteLine("read-" + Rcount);
         Thread.Sleep(1000);
         RCMutex.WaitOne();
         Rcount--;
         if (Rcount == 0)
         {
             WMutex.Release();
         }
         RCMutex.Release();
         RMutex.Release();
     }
 }
 public static void writer()
 {
     while (true)
     {
         Console.WriteLine("Writer waiting");
         RMutex.WaitOne();
         WMutex.WaitOne();
         Console.WriteLine("write");
         Thread.Sleep(1000);
         WMutex.Release();
         RMutex.Release();
     }
 }