lexi-lambda changed the topic of #racket to: Racket v7.2 has been released: https://blog.racket-lang.org/2019/01/racket-v7-2.html -- Racket -- https://racket-lang.org -- https://pkgs.racket-lang.org -- Paste at http://pasterack.org
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<marz_d`ghostman> I'm trying to follow this: https://launchpad.net/~plt/+archive/ubuntu/racket so I could install racket and install https://docs.racket-lang.org/sicp-manual/Installation.html
<marz_d`ghostman> I'm having problems installing racket on Ubuntu 16.04 though. After doing a sudo apt-get update, do I install it via sudo apt-get install racket though?
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<J_Arcane> yep
<marz_d`ghostman> Ah, I successfully installed it. Seems I have to reopen my terminal for it to refresh :) thanks
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<ecraven> hm.. should 'raco make foo.scm' work with a file that declares #lang r7rs?
<ecraven> this is the error I get: http://ix.io/1JD9
<ecraven> I'd like to precompile that file, to run it as a benchmark ;)
<ecraven> this used to work in previous racket versions, but seems to not work any longer.
<ecraven> I have done 'raco install r7rs' to pull in the dependencies
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<tonyg> I need advice on use of the evt system. Say I have a TCP-based protocol that I'm reading frames from. I want to turn my input-port into an event that fires only when there's a complete frame ready for me. When only half a frame is available, it shouldn't fire. So there has to be some kind of stateful parsing logic in there somewhere... but where?
<tonyg> The obvious solution is to spawn a thread and do the reading in there, and use a channel to hand over complete frames
<tonyg> but it's gross for all sorts of exception-handling thread-management reasons
<tonyg> and shouldn't it be possible to do with just the evt system?
<tonyg> Perhaps I need... replace-evt?? Or.... uh.... guard-evt???!?!
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<samth> tonyg: who's doing the stateful parsing before you call `sync`?
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<akaWolf> hi, guys! what is the proper way to run utils from installed package?
<akaWolf> I install racket-langserver. but how to use this properly?
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<bremner> are many people still actively teaching with plai/gc (or plai/gc2)? I noticed Shriram dropped it from the second edition of plai (fwiw).
<akaWolf> how to use racket-langserver?
<bremner> akaWolf: I guess it depends what you want to use it from. What editor do you have in mind?
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<akaWolf> bremner: Qt Creator
<akaWolf> I specify binary «racket» and path to «main.rkt» as arguments
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<akaWolf> when you install similar package in Python, it automatically creates binary
<akaWolf> I think there should be similar mechanism
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<bremner> akaWolf: can you get the server running manually?
<akaWolf> yep
<akaWolf> with «racket /path/to/main.rkt»
<akaWolf> even under IDE after small contract fixes it's working
<akaWolf> but for some weird reasons no highlighting
<tonyg> samth: the example I'm facing is from racket-rfc6455, where I have a websocket-connection wsc and run (sync ... (handle-evt wsc (lambda (_) (do-something-with (ws-recv wsc)))) ...)
<tonyg> samth: it's *normally* ok except when there are ping/pong packets going on behind the scenes.
<tonyg> samth: then I need to wake up on socket activity but not get as far as committing to hand out an incoming message, because there might not be one ready
<tonyg> and it looks like it might be useful.
<tonyg> i'll see tomorrow about altering rfc6455 to use io-evt / io-wait! from that gist, which should give me a ws-recv-evt without having to redo the implementation
<tonyg> i suspect I'll also be turning the gist into a blogpost
<tonyg> it's interesting, there don't seem to be many uses of replace-evt out there
<samth> that seems worryingly not threadsafe
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<tonyg> samth: how so? no threads involved
<samth> if you use the same evt from multiple threads
<tonyg> samth: oh right. yes, don't do that
<tonyg> also don't read from the same input-port from multiple threads
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<tonyg> but it definitely doesn't have the same nice all-or-nothing guarantees that other simpler evts have
<tonyg> which is a bit disappointing. it'd be interesting to think more about that part of it
<samth> Does reading from an input port from different threads not work?
<tonyg> but I don't have any really good ideas (except transactions of one flavour or another, I suppose)
<tonyg> samth: sure, but it'll interleave the inputs randomly
<tonyg> which is much like what'd happen with io-evts
<samth> I think it could be much worse
<tonyg> well, which is worse? two threads running ws-recv on the same connection, or two threads running io-evt ws-recv-evt (as we imagine it) on the same connection?
<tonyg> they'll interleave more or less the same kind of way
<tonyg> in both cases there aren't any atomic events that suit. it's possible that use of port-commit-peeked and progress-evt etc could get you to something somewhat transactional, but boy is that an unfriendly way to program
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<tonyg> perhaps i should learn more about progress-evt and friends; maybe there's a pleasant wrapper to let me program in a similar style to io-evt (which lets me program in a similar style to plain old blocking reads) waiting to be discovered
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