File a bug in JIRA, thanks! http://dev.clojure.org/jira/browse/ASYNC
David On Sun, Oct 12, 2014 at 5:56 AM, Tom Coupland <tcoupl...@gmail.com> wrote: > I've been seeing this weird looping behavior with some go loops over the > last few days. An exception is being thrown from a function within the loop > and rather than logging and looping back around to a waiting take, the loop > seems to just hop back to the line before the function call. It's been > driving me crazy, because it's, well, crazy :) > > I think i've managed to boil it down to the following: > > (def s (chan)) > (def single > (go-loop [] > (try > (prn "Awaiting single") > (<! s) > (prn "Single") > (throw (new Throwable)) > (catch Throwable t > (prn t))) > (recur))) > > (def d (chan)) > (def double > (go-loop [] > (try > (prn "Awaiting double") > (<! d) > (prn "Double") > (throw (new Throwable)) > (catch Exception re > (prn re)) > (catch Throwable t > (prn t))) > (recur))) > > Now if you (>!! s :a), you'll see the throwable printed out and the loop go > back to waiting on the s channel. However, (>!! d :a) and you'll get to > enjoy an infinite stream of 'Double'. In actual fact you can remove the > -loop from double and get the same result. > > Not sure what's going on here at all. In the macro expanded version of > double '(prn t)' doesn't appear at all (it does in single's expansion), so > it looks like it's not surviving the move into the state machine and instead > is routing back to (prn "Double") or the take isn't really completing > somehow, leaving the :a on the chan. Either way it doesn't seem right! > > I'd love for someone to shed some light on this behavior and/or point me at > something that would explain it. > > > -- > 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/d/optout. -- 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/d/optout.
