2010/1/28 Konrad Hinsen <konrad.hin...@fastmail.net>: > The Clojure solution for your problem is an agent, which makes the access > thread-safe: > > user> (def data-source (agent (cycle [1 2 3]))) > #'user/data-source > user> (defn get-some-data [] (let [v (first @data-source)] (send data-source > rest) v))
Wouldn't this make it possible for two threads to obtain the same value of (first @data-source), then send two rest messages to the agent? A ref would not have this problem, though: (def data-source (ref the_sequence)) (defn get-some-data [] (dosync (let [v (first @data-source)] (alter data-source rest) v))) Sincerely, Michal -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
