DoubleLockedInit

public async Task EnsureInitializedAsync()
{
    if (_isInitialized) return;

    if (_isInitializing && !_isInitialized)
    {
        do
        {
            await Task.Yield();
        } while (!_isInitialized);

        return;
    }

    _isInitializing = true;
    
    // Do initialization here
}