What you want is not possible since core.async does not do full program rewriting, only code within a go is transformed. This is for both performance and practical reasons.
So yes, wrapping a go in a go may seem a bit pointless, but that's exactly the semantic that you want, in a single threaded environment like JS VMs it is also the only possible solution. If you think about it, the semantics of what you are asking for is not possible. For how would you pause the execution of the (println) until the async evaluation of its arguments had completed? Timothy On Wed, Apr 23, 2014 at 3:56 AM, Dmitry Suzdalev <[email protected]> wrote: > Hello! > > I was interested in trying to wrap some callback-hellish JS async > functionality into something that would look (and work) like a sync call. > I thought that it could be some kind of function which internally uses > core.async but does not expose this. > > That is instead of having some function with callback on completion > > (.findSomething jsLib (fn [res] (println res))) > > I would like to have a sync-variant of it, something like this > > (defn findSomething [] > "returns res" > (let [c (chan)] > (go (!< (.findSomething jsLib (fn [res] (put! c res))))))) > > (println (findSomething)) ;; => prints "res" value > > It would work if go-macro returned last *value* read from the channel. But > go macro returns a *channel* that contains the result. So to read it in > clojurescript I have to ironically wrap go in go again. > Seems like when you started using channels there's no way out of this :) > On JVM I could just use <!! in this situation, but it is not supported in > ClojureScript. > > Wanted some advice/pointers from experienced programmers as I've just > started and might get something completely wrong :) > Thanks in advance, > Dmitry. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to [email protected] > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > [email protected] > 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 [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- “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 [email protected] Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to [email protected] 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
