using System;

using System.Collections.Generic;

​

using System.Threading.Tasks;

​

namespace ConsoleApplication7

{

    public sealed class Philoshoper

    {

​

        static public void Eat(object leftChopstick, object rightChopstick, int philosopherNumber, int leftChopstickNumber, int rightChopstickNumber)

        {

            lock (leftChopstick)                // Grab utencil on the left 

            {

                Console.WriteLine("   Philosopher {0} picked {1} chopstick.", philosopherNumber, leftChopstickNumber);

​

                lock (rightChopstick)           // Grab utencil on the right 

                {

                    // Eat here 

                    Console.WriteLine("   Philosopher {0} picked {1} chopstick.", philosopherNumber, rightChopstickNumber);

                    Console.WriteLine("Philosopher {0} eats.", philosopherNumber);

​

                    //Task.Delay(5000); 

                }

​

                Console.WriteLine("   Philosopher {0} released {1} chopstick.", philosopherNumber, rightChopstickNumber);

            }

​

            Console.WriteLine("   Philosopher {0} released {1} chopstick.", philosopherNumber, leftChopstickNumber);

        }

    }

​

   public  class Program

    {

     public    static void Main(string[] args)

        {

            const int numPhilosophers = 5;

​

            // 5 sticks on the left and right of each philosopher. Use them to acquire locks. 

            var chopsticks = new Dictionary<int, object>(numPhilosophers);

​

            for (int i = 0; i < numPhilosophers; ++i)

            {

                chopsticks.Add(i, new object());

            }

​

            // This is where we create philosophers, each of 5 tasks represents one philosopher. 

            Task[] tasks = new Task[numPhilosophers];

​

            tasks[0] = new Task(() => Philoshoper.Eat(chopsticks[0], chopsticks[numPhilosophers - 1], 0 + 1, 1, numPhilosophers));

​

            for (int i = 1; i < numPhilosophers; ++i)

            {

                int ix = i;

                tasks[ix] = new Task(() => Philoshoper.Eat(chopsticks[ix - 1], chopsticks[ix], ix + 1, ix, ix + 1));

            }

​

            // May eat! 

            Parallel.ForEach(tasks, t =>

            {

                t.Start();

            });

​

            // Wait for all philosophers to finish their dining 

            Task.WaitAll(tasks);

​

            Task.Delay(5000);

        }

    }

​

}

​