Although I think that a ref is the right tool for this purpose, for the
sake of completeness, I'll illustrate the threadsafe way to use an atom
here:
(defn make-blah [v]
(let [a (atom v)]
(fn [] (let [current-val @a]
(if (compare-and-set! a current-val (rest current-val))
(first current-val)
(recur))))))
On Thu, Dec 5, 2013 at 12:35 PM, Mark Engelberg <[email protected]>wrote:
> It's worth pointing out that if you really care about using it across
> multiple threads, an atom really isn't the right tool for the job. You
> should use a ref in order to place both the first and the rest into a
> single transaction:
>
> (defn make-blah [v]
> (let [a (ref v)]
> (fn [] (dosync (let [x (first @a)] (alter a rest) x)))))
>
>
>
> On Thu, Dec 5, 2013 at 12:24 PM, David Simmons <[email protected]>wrote:
>
>> Hi Puzzler
>>>
>>
>> I like the first approach you defined and it works perfectly thank you.
>>
>> cheers
>>
>> Dave
>>
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