using System;

using System.Collections.Generic;

using System.Threading;

using System.Threading.Tasks;

namespace ConsoleApplication139

{

    public sealed class persons

    {

​

        static public void eat(object leftchopstic, object rightchopstic, int numofpersons, int noleftchopstic, int norightchopstic)

        {

            lock (leftchopstic)

            {

                Console.WriteLine("person number {0} picked chopstic number {1}", numofpersons, noleftchopstic);

                lock (rightchopstic)

                {

                    Console.WriteLine("person number {0} picked chopstic number {1}", numofpersons, norightchopstic);

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

                    Thread.Sleep(2000);

                }

                Console.WriteLine("person number {0} release chopstic number {1}", numofpersons, norightchopstic);

​

            }

            Console.WriteLine("person number {0} release chopstic number {1}", numofpersons, noleftchopstic);

​

        }

​

​

    }

​

​

​

   public class Program

    {

        public  void Main()

        {

            const int numofpersons = 5;

​

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

​

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

            {

​

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

​

            }

            Task[] task = new Task[numofpersons];

            task[0] = new Task(() => persons.eat(chopsticks[0], chopsticks[numofpersons - 1], 0 + 1, 1, numofpersons));

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

            {

                int ix = i;

                task[ix] = new Task(() => persons.eat(chopsticks[ix - 1], chopsticks[ix], ix + 1, ix, ix + 1));

​

​

            }

            Parallel.ForEach(task, t =>

            {

                t.Start();

            });

            Task.WaitAll(task);

            Console.WriteLine("=======================================================================");

            Console.WriteLine("Done - all 5 people have eaten.");

        }

    }

}