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POClojure core.async, CPU hangs after timeout. Anyway to properly kill macro thread produced by (go..) block?
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copied!<p>Based on <a href="https://github.com/clojure/core.async/blob/e4acc9c30c283ac677e72010bde01971f61293ac/examples/walkthrough.clj#L97-L108" rel="noreferrer">core.async walk through example</a>, I created below similar code to handle some CPU intensive jobs using multiple channels with a timeout of 10 seconds. However after the main thread returns, the CPU usage remains around 700% (8 CPUs machine). I have to manually run nrepl-close in emacs to shut down the Java process.</p> <p>Is there any proper way to kill macro thread produced by (go..) block ? I tried close! each chan, but it doesn't work. I want to make sure CPU usage back to 0 by Java process after main thread returns.</p> <pre><code>(defn [] RETURNED-STR-FROM-SOME-CPU-INTENSE-JOB (do... (str ...))) (let [n 1000 cs (repeatedly n chan)] (doseq [c cs] (go (>! c (RETURNED-STR-FROM-SOME-CPU-INTENSE-JOB )))) (dotimes [i n] (let [[result source] (alts!! (conj cs (timeout 10000))) ] ;;wait for 10 seconds for each job (if (list-contains? cs source) ;;if returned chan belongs to cs (prn "OK JOB FINISHED " result) (prn "JOB TIMEOUT") ))) (doseq [i cs] (close! i)) ;;not useful for "killing" macro thread (prn "JOBS ARE DONE")) ;;Btw list-contains? function is used to judge whether an element is in a list ;;http://stackoverflow.com/questions/3249334/test-whether-a-list-contains-a-specific-value-in-clojure (defn list-contains? [coll value] (let [s (seq coll)] (if s (if (= (first s) value) true (recur (rest s) value)) false))) </code></pre>

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