using System;

using System.Collections.Generic;

using System.Threading.Tasks;

​

namespace Assignment3 

{

    public class Person

    {

        static public void Eat(Chopstick leftChopstick, Chopstick rightChopstick, int personNumber)

        {

            lock (leftChopstick)

            {

                Console.WriteLine("Person {0} picked {1} chopstick.", personNumber, leftChopstick.ID);

​

                lock (rightChopstick)

                {

                    Console.WriteLine("Person {0} picked {1} chopstick.", personNumber, rightChopstick.ID);

                    Console.WriteLine("Person {0} eats.", personNumber);

​

                }

​

                Console.WriteLine("Person {0} released {1} chopstick.", personNumber, rightChopstick.ID);

            }

​

            Console.WriteLine("Person {0} released {1} chopstick.", personNumber, leftChopstick.ID);

        }

    }

​

    public class Chopstick

    {

        public int ID { get; set; }

​

        public Chopstick(int id)

        {

            this.ID = id;

        }

    }

​

    public class Program

    {

        public static void Main(string[] args)

        {

            int numofChopsticks = 5;

            int numofPersons = 5;

​

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

            var chopsticks = new List<Chopstick>();

​

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

            {

                chopsticks.Add(new Chopstick(i+1));

            }

​

            var tasks = new List<Task>();

​

            for (int i = 0; i < numofPersons-1; i++)

            {

                int j = i;

                if (j == 0)

                {

                    tasks.Add(new Task(() => Person.Eat(chopsticks[0], chopsticks[numofPersons - 1], j + 1)));

                }

                else

                {

                    tasks.Add(new Task(() => Person.Eat(chopsticks[j + 1], chopsticks[j], j + 1)));    

                }

            }

​

            Parallel.ForEach(tasks, t =>

            {

                t.Start();

            });

​

​

            Task.WaitAll(tasks.ToArray());

        }

    }

}

​

​