Thanks everyone for your answers. I understand much better now. I just had
to make up some words like "rendezvous" and "pseudothread" to help me piece
together these implicit concepts.
On Sunday, May 19, 2019 at 10:33:07 AM UTC-7, Brian Beckman wrote:
>
> The documentation for >!! reads:
>
> -------------------------
> clojure.core.async/>!!
> ([port val])
> puts a val into port. nil values are not allowed. Will block if no
> buffer space is available. Returns true unless port is already closed.
>
>
> I have a case where I believe that the channel has no buffer, I park a
> "pseudothread" in a go block reading off that channel via <!, and then
> (lexically, not temporally), put to the unbuffered channel via >!!:
>
> (let [c (chan) ;; NO BUFFER!
> d (go (<! c)) ;; park a pseudothread to read c
> e (>!! c 42)] ;; blocking write to c, will unpark c's pseudothread
> (println {:c-coughs-up '(this will hang (<!! c)),
> :d-coughs-up (<!! d),
> :what's-e e})
> (close! c) (close! d))
>
> {:c-coughs-up (this will hang (<!! c)), :d-coughs-up 42, :what's-e true}
>
>
> This case leads me to wonder whether the documentation might read
>
> >!! will block if there is no buffer space available *and* if there is
> no *rendezvous *available, that is, no pseudothread parked waiting for <!.
>
> but it's more likely that I completely misunderstand core.async because I
> just made up the notion of a pseudothread in my struggle to understand!
>
>
>
>
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