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PO
primarykey
Id
18996377
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0
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0
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0
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CreationDate
2013-09-25T04:42:37.407
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0
LastActivityDate
2014-02-10T08:23:55.797
LastEditDate
2017-05-23T12:33:57.923
LastEditorUserId
-1
OwnerUserId
1232110
ParentId
18612063
PostTypeId
2
Score
1
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0
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text
Body
Based on answer for another related question <a href="https://stackoverflow.com/questions/18779296/clojure-core-async-any-way-to-control-number-of-threads-in-that-go-thread">How to control number of threads in (go...)</a>, I've found a better way to properly kill all the threads started by (go...) block: First alter the executor var and supply a custom thread pool <pre><code>;; def, not defonce, so that the executor can be re-defined ;; Number of threads are fixed to be 4 (def my-executor (java.util.concurrent.Executors/newFixedThreadPool 4 (conc/counted-thread-factory "my-async-dispatch-%d" true))) (alter-var-root #'clojure.core.async.impl.dispatch/executor (constantly (delay (tp/thread-pool-executor my-executor)))) </code></pre> Then call .shutdownNow and .awaitTermination method at the end of (go...) block <pre><code>(.shutdownNow my-executor) (while (not (.awaitTermination my-executor 10 java.util.concurrent.TimeUnit/SECONDS ) ) (prn "...waiting 10 secs for executor pool to finish") ) </code></pre> [UPDATE] The shutdown executor method above seems not pure enough. The final solution for my case is to send a function with control of its own timeout into go block, using <a href="https://github.com/flatland/clojail/blob/master/src/clojail/core.clj#L26" rel="nofollow noreferrer">thunk-timeout</a> function. Credits go to <a href="https://stackoverflow.com/questions/6694530/executing-a-function-with-a-timeout/6697356#6697356">this post</a>. Example below <pre><code>(defn toSendToGo [args timeoutUnits] (let [result (atom nil) timeout? (atom false)] (try ( thunk-timeout (fn [] (reset! result (myFunction args))) timeoutUnits) (catch java.util.concurrent.TimeoutException e (do (prn "!Time out after " timeoutUnits " seconds!!") (reset! timeout? true)) )) (if @timeout? (do sth)) @result)) (let [c ( chan)] (go (>! c (toSendToGo args timeoutUnits)))) </code></pre>
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1. POClojure core.async, CPU hangs after timeout. Anyway to properly kill macro thread produced by (go..) block?
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1. PTAnswer
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1. USCommunity
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1. USKevin Zhu
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