Consider the really slow fib function:
(defn fib [n]
(if (< n 2) n (+ (fib (dec n)) (fib (- n 2)))))
Now, let's say I want to compute the fib of some number n and timeout and
return nil if it takes longer than a second.
(defn try-fib [n]
(let [ch (timeout 1000)]
(go (>! ch (fib n)))
(<!! ch)))
This works, but let's say I invoke (try-fib 60). After one second, it
returns nil, but my CPU is still churning trying to compute (fib 60).
Is there some way to alter try-fib so that after returning nil, it cancels
the thread that is computing the intensive, never-ending computation?
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