Parallel task worker with kill signaling in Clojure

(ns taskwork2
(:refer-clojure :exclude [send])
(:require [zhelpers :as mq])
(:import [org.zeromq ZMQ$Poller]))

;; Task worker - design 2
;; Adds pub-sub flow to receive and respond to kill signal
;; Isaiah Peng <moc.liamg|airassi#moc.liamg|airassi>
//;; //

(defn -main []
(let [ctx (mq/context 1)
receiver (mq/socket ctx mq/pull)
sender (mq/socket ctx mq/push)
controller (mq/socket ctx mq/sub)
items (.poller ctx 2)
continue (atom true)]
(mq/connect receiver "tcp://localhost:5557")
(mq/connect sender "tcp://localhost:5558")
(mq/connect controller "tcp://localhost:5559")
(mq/subscribe controller "")
(.register items receiver ZMQ$Poller/POLLIN)
(.register items controller ZMQ$Poller/POLLIN)
;; Any waiting controller commands acts as 'KILL'
(while @continue ; Any better idea to break the loop?
(.poll items)
(if (.pollin items 0)
(let [string (mq/recv-str receiver)
nsec (Long/parseLong string)]
;; Do the work
(Thread/sleep nsec)
;; Send results to sink
(mq/send sender string)
;; Simple progress indicator for the viewer
(print ".")))
(if (.pollin items 1)
(reset! continue false)))
;; Finished
(.close receiver)
(.close sender)
(.close controller)
(.term ctx)))