using System;

using System.Threading;

jnkjnkjn

namespace threading

{

​

    public class MainClass

    {

        private static readonly object lockObject = new object();

        static readonly int THRESHOLD = 5;

​

        static int counter = 1;

​

        static void processData(int numberOfEmails)

        {

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

            {

​

                lock (lockObject)

                {

                    if (counter <= THRESHOLD)

                    {

                        Console.WriteLine("slots_left:" + counter + "; picked " + i);

                        ++counter;

                        new Thread(()=>SendEmail("done: "+ i)).Start();

                    }

                    else

                    {

                        --i; //countinue loop till slot's there

                    }

                }

            }

        }

        public static void SendEmail(string text)

        {

            Thread.Sleep(2000);

            lock (lockObject)

            {

                --counter;

            }

        }

​

        public static void Main()

        {

            processData(20);

        }

    }

}

​

​