using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        var sleepMilliseconds = 1000;

        var task1 = Task.Factory.StartNew(()=> {

            Console.WriteLine("task1 body");

            var innerTask1 = Task.Factory.StartNew(async()=> {

                Console.WriteLine("inner task1 body");

                //Thread.Sleep(sleepMilliseconds);

                await Task.Delay(TimeSpan.FromMilliseconds(sleepMilliseconds));

            }).Unwrap();

            Console.WriteLine("innerTask1.Wait()");

            innerTask1.Wait();

        }, TaskCreationOptions.LongRunning);

        var task2 = Task.Factory.StartNew(()=> {

            Console.WriteLine("task2 body");

            var innerTask2 = Task.Factory.StartNew(async()=> {

                Console.WriteLine("inner task2 body");

                //Thread.Sleep(sleepMilliseconds);

                await Task.Delay(TimeSpan.FromMilliseconds(sleepMilliseconds));

            }).Unwrap();

            Console.WriteLine("innerTask2.Wait()");

            innerTask2.Wait();

        }, TaskCreationOptions.LongRunning);

        Task.WaitAll(new []{task1,task2});

        Console.WriteLine(task1.Status);

        Console.WriteLine(task2.Status);

    }

}