using System;

using System.Collections.Generic;

using System.Threading.Tasks;

using System.Threading;

​

namespace Assignment3

{

    public class Philoshoper

    {

        static public void Eat(object leftChopstick, object rightChopstick, int philosopherNo, int leftChopstickNo, int rightChopstickNo)

        {

            lock (leftChopstick)               

            {

                Console.WriteLine("   Philosopher {0} picked {1} chopstick.", philosopherNo, leftChopstickNo);

​

                lock (rightChopstick)           

                {

                    Console.WriteLine("   Philosopher {0} picked {1} chopstick.", philosopherNo, rightChopstickNo);

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

​

                   Thread.Sleep(5000);       

                }

​

                Console.WriteLine("   Philosopher {0} released {1} chopstick.", philosopherNo, rightChopstickNo);

            }

​

            Console.WriteLine("   Philosopher {0} released {1} chopstick.", philosopherNo, leftChopstickNo);

        }

    }

​

    class Program

    {

        static void Main(string[] args)

        {

            const int numofPhilosophers = 5;

​

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

​

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

            {

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

            }

​

            Task[] tasks = new Task[numofPhilosophers];

​

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

​

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

            {

                int ix = i;

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

            }

​

            Parallel.ForEach(tasks, t =>

            {

                t.Start();

            });

​

            Task.WaitAll(tasks);

            Console.ReadKey(); 

        }

    }

}