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(defn wait-until
  [pred & {:keys [interval-ms]
           :or {interval-ms 5000}}]
  (while (not (pred))
    (Thread/sleep interval-ms)))

(defn- wait-while
  [pred & {:keys [interval-ms]
           :or {interval-ms 5000}}]
  (while (pred)
    (Thread/sleep interval-ms)))

;;; usage
(def a (atom false))

(future
  (wait-until #(do @a) :interval-ms 1000)
  (println "done!"))

(reset! a true)