using System;

using System.Collections.Generic;

using System.Threading.Tasks;

​

namespace Multithreading_Assignment_3

{

       public class Program

        {

            public static void Main(string[] args)

            {

                const int num_of_Persons = 5;

​

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

​

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

                {

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

                }

​

                Task[] tasks = new Task[num_of_Persons];

​

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

​

​

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

                {

                    int x = i;

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

                }

​

                Parallel.ForEach(tasks, t =>

                {

                    t.Start();

                });

                // Wait for all Persons to finish their dining

                Task.WaitAll(tasks);

                //display completion of all tasks

                Person.complete();

​

        }

    }

    public class Person

    {

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

        {

            lock (leftChopstick)                

            {

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

​

                lock (rightChopstick)           

                {

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

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

​

                }

​

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

            }

​

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

        }

        public static void complete()

        {

            Console.WriteLine("All 5 people have eaten");

        }

​

    }

}

​