clojure.core.async/alts!!

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Type: function Added: Clojure unknown Examples: 2 Runnable: 0

([ports & opts])

Like alts!, except takes will be made as if by <!!, and puts will be made as if by >!!, will block until completed. Not intended for use in direct or transitive calls from (go ...) blocks. Use the clojure.core.async.go-checking flag to detect invalid use (see namespace docs).

Examples

by runexec on 2014-10-06 . May have evaluation errors. ▶

(let [chans (partition-all 2 (interleave ["Bob" "Jane" "GuyGirl22"] (for [_ (range 3)] (chan)))) [owner port] (rand-nth chans) chans-only (mapv second chans)] (go (<! (timeout 1500)) (>! port (str owner ": First!!!"))) (let [[v p] (alts!! chans-only)] (println "Message: " v "\nFrom Object: " p))) ;; Message: Bob: First!!! ;; From Object: #<ManyToManyChannel clojure.core.async.impl.channels.ManyToManyChannel@70c61ad7> ;; nil

by quackingduck on 2016-06-23 . May have evaluation errors. ▶

(require '[clojure.core.async :as async]) ;; n.b. alts!! returns a *pair* of [value channel-where-value-came-from] ; a channel with a single value ready in the queue (def c (async/chan)) (async/put! c "foo") (println (async/alts!! [(async/timeout 2000) c])) ;; => ["foo" <c-channel>] ; no more values, so we will timeout (println (async/alts!! [(async/timeout 2000) c])) ;; => [nil <timeout-channel>]

See also

• clojure.core.async/alts! (1)
• clojure.core.async/alt! (0)
• clojure.core.async/alt!!

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