# File lib/ffi-rzmq/poll.rb, line 67
    def register pollable, events = ZMQ::POLLIN | ZMQ::POLLOUT
      return if pollable.nil? || events.zero?

      unless item = @poll_items[pollable]
        item = PollItem.from_pollable(pollable)
        @poll_items << item
      end

      item.events |= events
    end