Clock for pushing tasks to redis periodicall

clock.rb

redis = Redis.new(:host => redis_host, :port => redis_port)  
 while(1) do  
   first_url = redis.rpoplpush src_queue, src_queue
   redis.rpush work_queue, first_url  
   while(1) do  
    next_url = redis.rpoplpush src_queue, src_queue  
    if next_url != first_url  
      redis.rpush work_queue, next_url  
    else  
      break  
    end  
    sleep sleep_interval  
  end  
end