'Enable BRPOP mode for channel.'

def _register_BRPOP(self, channel):

    ident = (channel, channel.client, u'BRPOP')
    if (not self._client_registered(channel, channel.client, u'BRPOP')):
        channel._in_poll = False
        self._register(*ident)
    if (not channel._in_poll):
        channel._brpop_start()
