Atoms are not coordinated, so you need to use refs here:

(def map-1 (ref {}))
(def map-2 (ref {}))

(defn change [key1 key2 ]
   (dosync
       (alter map-1 dissoc key1)
       (alter map-2 dissoc key2)))

Depending on your problem you might consider using just one ref instead of
two as well (in that case, an atom should be fine).

~BG


On Wed, Jul 16, 2014 at 8:41 AM, zhenxuanpan <zhenxuan...@gmail.com> wrote:

> (def map-1 (atom {}))
> (def map-2 (atom {}))
>
> (defn change [key1 key2 ]
>    (dosync
>        (swap! map-1 dissoc key1)
>        (swap! map-2 dissoc key2)
>    )
> )
>
> is this way ok ?
>
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-- 
Baishampayan Ghose
b.ghose at gmail.com

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