Ah, that's put me on the right track. Thanks Timothy! -A
On Wed, Jul 17, 2013 at 10:16 AM, Timothy Baldridge <tbaldri...@gmail.com>wrote: > After a channel is closed, any gets (<!) from the channel will return nil. > I think some part of your code is taking that nil return value and trying > to forward it on to a channel. That's what the error is about. > > Timothy > > > On Wed, Jul 17, 2013 at 11:02 AM, Alan Shaw <noden...@gmail.com> wrote: > >> The problem I am having is in the function at line 41 of >> >> https://github.com/nodename/async-plgd/blob/master/src/hoare/coroutines.clj. >> Any insight into this is appreciated. >> >> -A >> >> >> >> On Wed, Jul 17, 2013 at 7:23 AM, Timothy Baldridge >> <tbaldri...@gmail.com>wrote: >> >>> True, but I'll mention the semantics of channels once again. Go blocks >>> are attached to channels, and channels exist on their own as values. No >>> where in this entire system is there some global list of channels or go >>> blocks (except for in the executors, but let's not get into that right >>> now). >>> >>> This means that entire chains of gos and channels can be reclaimed by >>> the GC if neither end of the chain is anchored in a GC root. >>> >>> Timothy >>> >>> >>> On Wed, Jul 17, 2013 at 8:17 AM, Laurent PETIT >>> <laurent.pe...@gmail.com>wrote: >>> >>>> 2013/7/17 Timothy Baldridge <tbaldri...@gmail.com>: >>>> > It appears that you cannot call close! within a go block and so >>>> >> >>>> >> to signal the end of input to a channel you have to use another >>>> channel >>>> >> upon which the receiver can alt!. >>>> >> >>>> > >>>> > That's shouldn't be true. What problems did you run into with this? >>>> >>>> Silly suggestion : maybe the OP is trying to call close! on a channel >>>> which is unbuffered, after having put a value. >>>> >>>> I can imagine, then, that it is only when a consumer has taken the >>>> value out of the unbuffered channel, that the producer will be >>>> unblocked, and the call to close! will be executed. >>>> >>>> So maybe using a channel of size 1 may help make the symptom disappear ? >>>> >>>> > >>>> > And yes, channels and go's are automatically GC'd when they can no >>>> longer be >>>> > access by the system. So these channels/gos get GC'd as fast as they >>>> are >>>> > created. >>>> > >>>> > (loop [] >>>> > (let [c (chan)] >>>> > (go (<! c)) >>>> > (recur))) >>>> > >>>> > Timothy >>>> > >>>> > -- >>>> > -- >>>> > 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. >>>> > >>>> > >>>> >>>> -- >>>> -- >>>> 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. >>>> >>>> >>>> >>> >>> >>> -- >>> “One of the main causes of the fall of the Roman Empire was that–lacking >>> zero–they had no way to indicate successful termination of their C >>> programs.” >>> (Robert Firth) >>> >>> -- >>> -- >>> 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. >>> >>> >>> >> >> -- >> -- >> 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. >> >> >> > > > > -- > “One of the main causes of the fall of the Roman Empire was that–lacking > zero–they had no way to indicate successful termination of their C > programs.” > (Robert Firth) > > -- > -- > 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. > > > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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