my tiny threadpool

threadpool.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace ThreadPool
{
    class Program
    {
        static int MaxThreads = 10; // maximum thread to run at one time
        static int _numOfThreads = 50; // amount of threads to be executed 
        static volatile int _curThreads = 0; // current running threads
        static Queue<Thread> _handlers = new Queue<Thread>(); // threadpool

        static readonly object _countLock = new object();

        static void Main(string[] args)
        {
            for (int i = 0; i < _numOfThreads; i++)
            {
                Thread worker = new Thread(Run);
                worker.Name = i.ToString();
                _handlers.Enqueue(worker);
            }

            do
            {
                lock (_countLock)
                {
                    if (_curThreads < MaxThreads && _handlers.Count > 0)
                    {
                        var t = _handlers.Dequeue();
                        t.Start();
                    }
                    Thread.Sleep(1000); // each thread starts after other 1 second
                }
            }
            while (_curThreads > 0) ;

            Console.Read();
        }

        public static void Run()
        {
            _curThreads++;
            var threadNo = Thread.CurrentThread.Name;
            Console.WriteLine("Thread {0} starts", threadNo);

            for (int i = 0; i < 30; i++)
            {
                Thread.Sleep(400);
                Console.WriteLine("Thread {0}: {1}", threadNo, i);
            }

            _curThreads--;
        }
    }
}