class ThreadSafe::Util::Striped64

def try_to_install_new_cell(new_cell, hash)
  try_in_busy do
    # Recheck under lock
    if (current_cells = cells) && !current_cells.volatile_get(i = current_cells.hash_to_index(hash))
      current_cells.volatile_set(i, new_cell)
    end
  end
end