user=> (def f (future (inc 0))) #'user/f user=> (future-cancel f) false user=> (future-cancelled? f) false user=> (future-done? f) true user=> @f 1
user=> (def f (future (Thread/sleep 5000) (inc 0))) #'user/f user=> (future-cancel f) true user=> (future-cancelled? f) true user=> (future-done? f) true user=> @f java.util.concurrent.CancellationException (NO_SOURCE_FILE:0)
Source
clojure/core.clj:6086
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(defn future-cancelled?
"Returns true if future f is cancelled"
{:added "1.1"
:static true}
[^java.util.concurrent.Future f] (.isCancelled f))
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