Nito.AsyncEx.AsyncAutoResetEvent.WaitAsync with timeout -- https://stackoverflow.com/questions/32654509/awaitable-autoresetevent

gistfile1.txt

public static async Task<bool> WaitAsync(this AsyncAutoResetEvent source,
    TimeSpan timeout, CancellationToken cancellationToken = default)
{
    if (timeout < TimeSpan.Zero) throw new ArgumentOutOfRangeException(nameof(timeout));
    if (timeout == Timeout.InfiniteTimeSpan)
    {
        await source.WaitAsync(cancellationToken); return true;
    }

    cancellationToken.ThrowIfCancellationRequested();
    using var linkedCts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
    linkedCts.CancelAfter(timeout);
    try
    {
        await source.WaitAsync(linkedCts.Token); return true;
    }
    catch (OperationCanceledException)
    {
        cancellationToken.ThrowIfCancellationRequested();
        return false;
    }
}