I have a hard time understanding why there is a need to retry when doing "swap!" on an atom. Why does not Clojure just lock the atom up-front and do the update? I have this question because I don't see any benefit of the current "just try and then re-try if needed" (STM?) approach for atom (maybe OK for refs because you cannot attach a lock to unknown ref combinations in a "dosync" clause). Right now I have an atom in my program and there are two "swap!" functions on it. One may take a (relatively) long time, and the other is short. I don't want the long "swap!" function to retry just because in the last minute the short one sneaked in and changed the atom value. I can do the up-front lock myself, but I wonder why this is not already so in the language. Thank you for any enlightenment.
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