;;   Copyright (c) Rich Hickey and contributors. All rights reserved.
;;   The use and distribution terms for this software are covered by the
;;   Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
;;   which can be found in the file epl-v10.html at the root of this distribution.
;;   By using this software in any fashion, you are agreeing to be bound by
;;   the terms of this license.
;;   You must not remove this notice, or any other, from this software.

(ns cljs.core.async.test-helpers)

(defn latch [m f]
  (let [r (atom 0)]
    (add-watch r :latch
      (fn [_ _ o n]
        (when (== n m) (f))))
    r))

(defn inc! [r]
  (swap! r inc))