On Oct 8, 3:43 am, Timothy Pratley <timothyprat...@gmail.com> wrote:
> Atoms can't do this, as they are synchronous (called and returned
> immediately) - hence the warning about potentially being called
> multiple times.
The reason that swap! may "fail" is that it is performing a compare-
and-swap operation which may fail in a concurrent setting; the
function passed to swap is retried if this happens.
An approach that might work for you depending on your situation is to
send to an agent which asynchronously does the swap.
(def a (atom 40))
(def queue (agent nil))
(def r1 (ref 0))
(def r2 (ref 0))
(dosync
(let [v1 (alter r1 inc)
v2 (alter r2 inc)]
(send queue (fn [_] (swap! a #(+ v1 v2 %))))))
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