using System;

using System.Threading;

using System.Threading.Tasks;

​

class Program

{

    static async Task Main()

    {

        var _lock = new ReentrantAsyncLock.ReentrantAsyncLock();

        Log($"Obtain the lock before entering the for loop");

        await using (await _lock.LockAsync(CancellationToken.None))

        {

            for (int i = 0; i < 100; ++i)

            {

                Log(i, "Try to obtain the lock");

                await using (await _lock.LockAsync(CancellationToken.None)) // <--------- The deadlock happens here at some iteration

                {

                    Log(i, "Obtained the lock. Start waiting for 1ms");

                    await Task.Delay(TimeSpan.FromMilliseconds(1));

                    Log(i, "Waiting finished.");

                }

                Log(i, "Lock released");

            }

            Log("The loop finished successfully. Release the lock");

        }

        Log("The lock is completely released. Exit the main method");

    }

​

    static void Log(string msg)

    {

        Console.WriteLine($"[ThreadId={Thread.CurrentThread.ManagedThreadId,-2}] {msg}");

    }

​

    static void Log(int iteration, string msg)

    {

        Console.WriteLine($"[i={iteration,-2},ThreadId={Thread.CurrentThread.ManagedThreadId,-2}] {msg}");

    }

}