Two notes: 1)The provided core.async go-loop macro is a small enhancement for the (go (loop )) case. 2) Be careful using when using falsey tests like when or if - these will stop on nil but will also stop on false coming through the channel. Might be ok here, but it's something to be aware of.
Alex On Monday, January 13, 2014 11:45:52 PM UTC-6, Mark Mandel wrote: > > I found this macro I wrote really useful for exactly this type of thing: > https://github.com/markmandel/while-let > > As long as you are happy for your go loop to stop when nil comes through > (i.e. when it gets closed). > > (go (while-let [data (<! (channel))] > (println data))) > > > Mark > > > On Tue, Jan 14, 2014 at 4:34 PM, t x <txre...@gmail.com <javascript:>>wrote: > >> Understood. Thanks for the clarification. >> >> >> On Mon, Jan 13, 2014 at 9:28 PM, Ben Mabey <b...@benmabey.com<javascript:> >> > wrote: >> >>> On Mon Jan 13 18:11:10 2014, t x wrote: >>> >>>> Consider the following code block: >>>> >>>> >>>> (defn make-stupid [] >>>> (go (loop [] >>>> (recur)))) >>>> >>>> (def x (make-stupid)) >>>> >>>> ;; ... is there a way to kill this infinite go-loop ? >>>> >>> >>> No, you can not kill the loop with the go channel that is bound to x. >>> You need to return a stop, a.k.a. poison, channel that the go block checks >>> before recurring. Something like: >>> >>> (let [stop (chan)] >>> (go >>> (loop [] >>> (when (alt! stop false :default :keep-going) >>> ... >>> (recur)))) >>> stop) >>> >>> -Ben >>> >>> -- >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Clojure" group. >>> To post to this group, send email to clo...@googlegroups.com<javascript:> >>> Note that posts from new members are moderated - please be patient with >>> your first post. >>> To unsubscribe from this group, send email to >>> clojure+u...@googlegroups.com <javascript:> >>> 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+u...@googlegroups.com <javascript:>. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >> >> -- >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clo...@googlegroups.com<javascript:> >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+u...@googlegroups.com <javascript:> >> 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+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > > > -- > E: mark....@gmail.com <javascript:> > T: http://www.twitter.com/neurotic > W: www.compoundtheory.com > > 2 Devs from Down Under Podcast > http://www.2ddu.com/ > -- -- 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.
