Apologies in advance if this question has a simple answer that I'm overlooking!
Suppose I have a ref or atom and I periodically need to call a long-running function on it: (def r (ref 0)) (defn f [_] (Thread/sleep 1000) -10) Suppose also that the ref is being modified from other threads at shorter intervals than the execution time of f. I'll simulate this with: (future (loop [] (Thread/sleep 500) (dosync (alter r inc)) (recur))) In this situation, the following will never return: (dosync (alter r f)) The reason is that the value of r never stays the same long enough for f to see and then update a consistent value. Is there a way to cause r to be locked during the (dosync (alter r f)) so that all other alterations will be held until after it completes? I know this isn't normally the desired behavior, but is it possible to obtain? Neither of the following works: (locking r (dosync (alter r f))) (dosync (locking r (alter r f))) I could simulate part of the behavior I want with agents and await, but then I lose the ability to synchronize alterations. Thanks for any insights! Garth -- 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
