#crystal-lang on 2015-11-04 — irc logs at freenode.irclog.whitequark.org

2015-10-30 12:56 jhass changed the topic of #crystal-lang to: The Crystal programming language | http://crystal-lang.org | Crystal 0.9.1 | Fund Crystals development: http://is.gd/X7PRtI | Paste > 3 lines of text to https://gist.github.com | GH: https://github.com/manastech/crystal | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/ | Logs: http://irclog.whitequark.org/crystal-lang

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04:55 <crystal-gh> [crystal] jhass opened pull request #1864: Base 62 support (master...base62) http://git.io/vl7z2

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08:21 <crystal-gh> [crystal] jhass closed pull request #1849: Fix: File.basename("/") gets negative count (ArgumentError) (master...master) http://git.io/vlCT7

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08:31 <travis-ci> manastech/crystal#e394256 (master - Merge pull request #1849 from ch3n/master): The build passed. https://travis-ci.org/manastech/crystal/builds/89172220

08:31 <DeBot> https://github.com/manastech/crystal/pull/1849 (Fix: File.basename("/") gets negative count (ArgumentError))

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12:47 <xdougx> guys i have an doubt about process, there is a well practice to open and kill process when is not running?

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15:24 <jhass> xdougx: I don't understand the question

15:43 <xdougx> jhass: some process even killing with signa term isnt been killed

15:44 <jhass> maybe it traps sigterm and is stuck somehow so it can't run the handler

15:45 <jhass> I usually try sigquit in those cases to get rid of it, before sigkill

15:49 <xdougx> jhass: i have this method http://carc.in/#/r/lvm

15:49 <xdougx> so instead of use Signal::TERM use Signal::TRAP

15:49 <jhass> xdougx: ah, system block

15:49 <jhass> *blocks

15:49 <jhass> use Process.new for a non-blocking call

15:50 <xdougx> okay, instead of fork then new

15:56 <xdougx> jhass: Process.new(cmd) or Process.run(cmd, args) ?

15:57 <jhass> Process.new, same signature as .run

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17:20 <xdougx> jhass: even given a signal kill it still on my ps aux command `24690 ubuntu 20 0 0 0 0 Z 0.0 0.0 0:00.00 | `- crystal-run-boo`

17:20 <xdougx> jhass: it means nothing, right?

17:21 <jhass> I don't follow what you're doing, what you're having and what you want, sorry

17:22 <xdougx> jhass: when i run system(cmd), inside a fork process, it stay in the ps aux command inside the crystal process

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17:22 <jhass> system blocks, it won't return until the child exits

17:23 <xdougx> ahhh i see, its not using cpu and ram, so its fine

17:27 <jhass> xdougx: you want to replace your crystal process with another command?

17:28 <xdougx> jhass: thats is fine, then all process finishes theres no trace of the process anymore

17:28 <xdougx> when*

17:28 <jhass> that's not a yes or no

17:28 <jhass> I guess I still have no clue about your actual goal

17:28 <xdougx> no, its needed

17:29 <xdougx> my goal is: has no unfinished process running

17:30 <jhass> I don't think that's a goal

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17:30 <xdougx> when my process starts and all children, everyone need to finish in the end

17:31 <xdougx> i was having some process sleeping forever when something went wrong

17:31 <jhass> you shouldn't need fork

17:31 <jhass> commands.map {|command| Process.new(command) }.each &.wait

17:31 <jhass> will ran everything in parallel and wait until all exited

17:32 <jhass> *run

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17:32 <xdougx> the thing is, i need to wait an rake process finishes before start another one when its triggered again

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17:35 <jhass> @running_process = nil; ...; process = @running_process; process.wait if process; @running_process = Process.new(command)

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20:31 <nakilon> hi, asterite

20:31 <nakilon> is there any point in having the "@end = false" here? https://github.com/manastech/crystal/commit/046154c7e36602a00843914cc0fd23a6b9bd1657#diff-87ebb896824e7dc3bd8d5b29293bcf00R2675

20:32 <nakilon> is the string constructor used anywhere with this parameter passed?

20:32 <nakilon> I wish it wasn't, so I would suggest to:

20:32 <nakilon> 1) remove line 2691

20:33 <nakilon> 2) change line 2697 to "@end = (@reader.string.bytesize == 0)"

20:33 <nakilon> otherwise this all looks almost like indian code: if a == true then b = true else b = false

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20:38 <zodiak> hola.. anyone got any tutorials/guides/quick 'hey dumbie, here is how you do this' for channels ?

20:38 <zodiak> trying to compare/contrast the classic producer/consumer pattern

20:41 <jhass> zodiak: the interface is still not finalized, so it's kinda not worth to write in depth docs yet

20:41 <jhass> zodiak: the gist is, Channel is your Queue, spawn is your Thread.new

20:41 <zodiak> okily dokily

20:41 <jhass> a (full) channel will block the current coroutine on .send

20:42 <jhass> a (empty) channel will block the current coroutine on .receive

20:42 <zodiak> gotcha

20:42 <jhass> Channel.new is unbuffered, Channel.new(64) is buffered

20:42 <zodiak> you say it's not finalized, does that mean things such as actors for concurrency are potentially incoming or ?

20:43 <jhass> not sure if actor will happen in stdlib

20:43 <jhass> but there are more concrete plans to have syntax for receive and send

20:43 <jhass> and Channel.select

20:43 <zodiak> tbh, from the 20,000 foot view, I don't see what's missing from the above

20:43 <zodiak> maybe some syntactic sugar but..

20:44 <jhass> Channel.select is still ugly

20:44 <zodiak> Channel.select([item1, item2]) deal .. right ?

20:44 <jhass> yeah, nope

20:44 <zodiak> I mean, if that's the case, it's not ugly (maybe the internals are, I obviously can't speak to that)

20:45 <jhass> Channel.select(chan.receive_op, chan.send_op(foo)) #=> {n, value}

20:45 <jhass> I got some interim wrappers through so you can Channel.receive_first(chan, chan, ...) nad Channel.send_first

20:45 <jhass> but all this won't end up being user facing API

20:45 <jhass> it's just for now

20:45 <zodiak> roger roger

20:46 <zodiak> in the case of p/c, I think I am good to forge ahead

20:46 <zodiak> I can see how for more complicated things, more control/flow maybe needed but.. yeah, for me, not a big thing.

20:46 <zodiak> danke :)

20:46 <jhass> gerne ;)

20:48 <zodiak> hah! du bist duetsche ? mein leibchen ist .. and that's why my german sucks ;)

20:52 <jhass> I'm still amazed and confused how many (non-native speakers) people know at least some german

20:53 <jhass> I mean I went to school 1km from denmark and I know not a single word danish

20:54 <fowlduck> my girlfriend's kid goes to a german immersion school here in milwaukee

20:54 <zodiak> I think it comes from the fact that I am european (lived there 22 years from birth before moving).. so I have a smattering of french etc

20:54 <fowlduck> oh snap, is someone working on channels/select in crystal again?

20:54 <zodiak> but.. german is a really nice language :)

20:54 <BlaXpirit> SCHMETTERLING

20:55 <fowlduck> I'm learning esperanto

20:55 <fowlduck> which is a silly language

20:55 <fowlduck> very silly

20:55 <zodiak> ah, the language of hope

20:55 <fowlduck> for a realist like me, it is, at least

20:55 <zodiak> kuger-schrieber

20:55 <zodiak> (although my spelling is awful ;)

20:55 <fowlduck> but it's fun and easy, and my gf and I can talk without people knowing what we're talking about, mostly

20:56 <BlaXpirit> zodiak, that's k'u'gel i think

20:56 <zodiak> schneeflocken is my favourite word though :)

20:56 <zodiak> kugel.. got it (again, my spelling is awful :)

20:57 <zodiak> to stay more on topic though, I think good/sane/sensible concurrency is almost mandatory for new languages

20:57 <zodiak> so, taking it time and getting it right (thumbsup)

20:57 <jhass> in other news twitch installs archlinux just installed winows xp. In german.

20:57 <zodiak> HAH

20:57 <jhass> http://cloud.aeshna.de/u/mrzyx/screenshots/screenshot_20151104_215556.png

20:57 <BlaXpirit> whatever, it's stupid

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21:51 <crystal-gh> [crystal] asterite pushed 1 new commit to master: http://git.io/vlx9b

21:51 <crystal-gh> crystal/master f27d8d0 Ary Borenszweig: Allow forward declarations for lib external vars

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22:02 <travis-ci> manastech/crystal#f27d8d0 (master - Allow forward declarations for lib external vars): The build passed. https://travis-ci.org/manastech/crystal/builds/89321221

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23:33 <crystal-gh> [crystal] asterite pushed 3 new commits to master: http://git.io/vlpay

23:33 <crystal-gh> crystal/master 0efd106 Jonne Haß: Add base 62 for Int#to_s

23:33 <crystal-gh> crystal/master 143d3ab Jonne Haß: Add base 62 to String#to_i

23:33 <crystal-gh> crystal/master 13f056d Ary Borenszweig: Merge pull request #1864 from jhass/base62...

23:44 <travis-ci> manastech/crystal#13f056d (master - Merge pull request #1864 from jhass/base62): The build passed. https://travis-ci.org/manastech/crystal/builds/89340579

23:44 <DeBot> https://github.com/manastech/crystal/pull/1864 (Base 62 support)