using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        const int persons = 5;

            var chopStick = new Dictionary<int, object>(persons);

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

            {

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

            }

​

            Task[] task = new Task[persons];

​

            task[0] = new Task(() => Person.Eat(chopStick[0], chopStick[persons - 1], 1, 1, persons));

​

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

            {

                int x = i;

                task[x] = new Task(() => Person.Eat(chopStick[x - 1], chopStick[x], x + 1, x, x + 1));

            }

​

            Parallel.ForEach(task, t =>

            {

                t.Start();

            });

            Task.WaitAll(task);

​

            Console.WriteLine("Done - all {0} persons", persons);

            Console.ReadKey();

    }

}

public class Person

    {

        public static void Eat(object leftChopStick, object rightChopstick, int person, int leftChopstickNum, int rightChopstickNum)

        {

            lock (leftChopStick)

            {

                Console.WriteLine("Person {0} picked {1} chopstick ", person, leftChopstickNum);

                lock (rightChopstick)

                {

                    Console.WriteLine("Person {0} picked {1} chopstick ", person, rightChopstickNum);

                    Console.WriteLine("Person {0} eat", person);

                    //Thread.Sleep(100);

                }

​

                Console.WriteLine("Person {0} released {1} chopstick", person, rightChopstickNum);

            }

​

            Console.WriteLine("Person {0} released {1} chopstick", person, leftChopstickNum);

        }

    }

​

​