On Thu, May 30, 2013 at 3:05 PM, Josh Kamau <joshnet2...@gmail.com> wrote: > > I am trying to understand (ref-history-count ref) . I thought it counts > the number of "old" values in the ref. But in all my tests, its always > returning zero. How is it used? >
In clojure's STM, history is created only when required. This is a performance choice, the assumption is that 'most' STM transactions won't contend. In your case you have only one transaction so no history is ever created. Try creating a long running transaction in one thread and executing short running transactions in other thread(s) all altering the same ref and you will see history in action. HTH. -- -- 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 --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
