Thanks for the pointers both. What still riddles me is why the above script with the first formula (with the deref problem) doesn't always cause a problem, but maybe one in every 5 times I run it.
@Timothy - double thanks for your clarifications. I am changing my program from a ref-based to a send / agent-based.. I'm somewhere half between now :P. On Jan 18, 3:42 pm, Timothy Pratley <timothyprat...@gmail.com> wrote: > > (defn death > > [host] > > (dosync > > (if (not (empty? @host)) > > nil))) > > The agents initial value is a ref. Sometimes you set it to nil. nil > cannot be dereferenced. Perhaps you meant to set the ref to nil (if > (not-empty @host) (ref-set host nil)). > > However I think you've gone a little off track mixing agents and refs > like this. The value of an agent is already thread safe, so there is > no need to protect it with a ref. > (def myagent (agent 5)) > (defn death [host] (if host nil)) > (send death myagent) > > > (defn death > > [host] > > (dosync > > nil)) > > This just returns nil all the time, no deref is done. --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
