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.
