On Feb 20, 6:07 am, Jack Fang <jack.fang1...@gmail.com> wrote: > Suppose the transfer-money and print-info are run in different > thread. With the current Clojure STM, is it possible that print-info > prints the old source-account information and modified dest-account > information?
Yes. > Do I need to add a dosync to the print-info function? I > read the Programming Clojure. It says do not have side-effect on a > transaction. If you want consistent results between refs, you'll need to be in a transaction, thus dosync. You might also need to use ensure, but I'm not certain. The reason side-effects are discouraged (not forbidden) is because a transaction may be run multiple times, thus you might get multiple printouts. > If I add dosync to the print-info, do I need to use agent Agents are desgned to be used for side-effects in a transaction. That's why sends to an agent are held and only actually happen if the tx commits. It mIght be overkill for your examle, but yes send ensured/altered values to an agent from inside a dosync block. > to print the info? -- 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
