Hi, Ok, but maybe the point of Meikel is that doing so may (?) be relying on undocumented implementation detail ... ?
2010/3/15 Michał Marczyk <michal.marc...@gmail.com>: > On 15 March 2010 21:08, Meikel Brandmeyer <m...@kotka.de> wrote: >> Now I'm confused. Calling ensure on r shouldn't have an effect since we >> call alter on r anyway, no? > > ensure "protects the ref from modification by other transactions" > (from the docs). alter does not. > > Reading into the Java code, ensure puts a lock on the ref, which, once > in place, guarantees that the transaction doing the ensuring has an > exclusive right to modify the ref until it commits / retries... or > something, my Java-fu is still nothing to boast about, regrettably. > > At any rate, my current understanding is that, in Garth's example, the > ensure gives (alter r f) all the time it needs to modify r's value > while putting all other transactions which attempt to modify r on > hold. alter, by itself, never interferes with background transactions; > should something disappear from under its feet, it expects to be > retried. > > Ok, back to improving my Java chops in the hope of grasping all the > intricasies of Rich's code sometime... *sigh* > > Sincerely, > Michał > > -- > 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 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
