using System;

using System.Threading.Tasks;

using NeoSmart.AsyncLock;

public class Program

{

    public static async Task Main()

    {

        var asyncLock = new AsyncLock();

        async Task InnerFunctionAsync()

        {

            using (await asyncLock.LockAsync())

            {

                //

            }

        }

        using (await asyncLock.LockAsync())

        {

            await InnerFunctionAsync();

            await InnerFunctionAsync();

        }

        Console.WriteLine("Done!");

    }

}