--- Log opened Tue Aug 17 00:00:05 2010
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01:41 < plexdev> http://is.gd/ekTje by [Alex Brainman] in go/src/pkg/os/ --
os: preserve "=C:" like env variables in env block on windows and bug fix in
Clearenv()
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02:58 < wobsite> hey everyone.  I'm trying to figure out cgo, and having
some trouble with getting C code to call Go code.  specifically, I have a C
function that expects a function pointer (no return value or arguments to the
pointer) and I want to be able to pass a Go function to it.
02:58 < wobsite> has anyone had any luck with something like this?
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03:02 < Namegduf> wobsite: You can't.
03:02 < Namegduf> C code can't call Go code.
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03:03 < exch> you can, but it involves a lot of black magic and not really
any guarantee that it'll work as intended
03:04 < exch> prefix the Go function you want to export with //export foo
03:04 < exch> where 'foo' is the name you want it to be callable as
03:05 < wobsite> yeah, I saw something like that in the source tree
somewhere.  couldn't quite figure out what to make of it though
03:05 < wobsite> I'll try that.  thanks
03:07 < zaero> I was able to make Go functions callable through lua doing
some black magic like that
03:08 < zaero> i had a helper function in both C and Go to make it work
03:08 < exch> zaero: was the performance somewhat acceptable?
03:09 < zaero> i never profiled it, it was just a toy
03:09 < exch> k
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03:23 < crazy2be> hello
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03:24 < exch> lo
03:24 < crazy2be> I am trying to get the exit status of a script i am
executing using go
03:28 < crazy2be> is there a prefered pastebin used by this channel?
03:28 < crazy2be> or does anywhere work :P?
03:28 < exch> anywhere is ok :p
03:29 < crazy2be> ok, so i have a function like this to run my bash script:
http://pastebin.com/iaEyxZTt
03:29 < crazy2be> most of that is just for debugging
03:29 < crazy2be> well the ff shouldn't be there
03:29 < crazy2be> that was just to make the compile script fail
03:29 < crazy2be> but anyway
03:30 < crazy2be> uh
03:30 < crazy2be> well
03:30 < crazy2be> it's working now?
03:30 < crazy2be> wierd
03:30 < crazy2be> well thansk
03:30 < crazy2be> *thanks
03:30 < exch> np :p
03:31 < crazy2be> but uh, i have another question.
03:32 < crazy2be> this is basically a handler for part of an administration
interface for my server
03:32 < crazy2be> and it recompiles the go code, and then restarts the
server
03:32 < crazy2be> how can i run the server, and make sure it starts
properly, before exiting?
03:34 < exch> having the program launch itself with os.Exec() should work.
Just make sure the http listener is closed.  It's bound to a fixed port.
Launching the server again on that same port will make it fail
03:35 < crazy2be> ok, so i have to close the http listener, wait a
reasonable amount of time, make sure the program is operational, and then shut
down?
03:35 < crazy2be> and if it's not, i restore the listener
03:35 < exch> that could work
03:35 < crazy2be> now to see if that's possible, easily
03:35 < exch> during that time, the server will be unreachable though
03:37 < exch> os.Exec or os.ForkExec will give you the new pid or an error
if things went wrong
03:38 < crazy2be> yeah, although the os package documentation is a bit
confusing for someone not entirely familiar with unix system internals
03:38 < crazy2be> overall go is very well documented though
03:39 < exch> the syscall package even more so :)
03:39 < xb95> the code is remarkably self documenting too
03:39 < xb95> easy to read and follow
03:39 < exch> yup
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03:53 < crazy2be> i'm just waiting for some opengl/graphical bindings
03:53 < crazy2be> that would be nice
03:53 < exch> there are sdl/opengl bindings
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03:54 < exch> http://go-lang.cat-v.org/library-bindings
03:55 < crazy2be> hey!  they were not there last time i checked
03:56 < crazy2be> how does it deal with multithreading and such?
03:57 < exch> it probably doesn't.  Not sure tbh.  I haven't tried that yet
03:58 < crazy2be> huh.  Looks like it just calls the C functions
03:59 < crazy2be> don't really understand *how*
04:00 < exch> yes.  it uses cgo.  a 'special' compiler part of the Go
toolchain that allows calling C code by linking to a shared library
04:00 < crazy2be> gccgo?
04:00 < crazy2be> or is cgo different?
04:00 < exch> nope, cgo
04:00 < exch> gccgo is just a gcc frontend for compiling regular go code
04:01 < crazy2be> yes, but it allowed linking with C programs i thought
04:01 < crazy2be> what is cgo?
04:01 < crazy2be> i didn't see it in any of the documentation
04:01 < exch> it's not very well documented
04:01 < exch> it's in $GOROOT/bin
04:02 < exch> along with the other compilers/linkers
04:02 < jessta> crazy2be: http://golang.org/cmd/cgo/
04:03 < exch> it basically creates behind-the-scenes interop code which it
auto-generates from your Go files and then makes sure both the normal go compiler
and gcc get called to build everything into a single neat package
04:07 < crazy2be> cool.  That makes bindings to existing C libraries fairly
easy
04:07 < crazy2be> although unsafe, since i assume it doesn't make it thread
safe
04:07 < crazy2be> somehow
04:08 < exch> it doesn't.  There's also the issue of Go having a GC which
can gobble up data that C expects to have around.  I havent run into any problems
with that yet, but it's worth keeping that in mind
04:09 < exch> Any data you create through C calls (malloc() etc) should also
be free()'d explicitely.  Go won't do that for you
04:11 < crazy2be> hmm
04:12 < crazy2be> i've having trouble figuring out how to shut down the
server
04:12 < crazy2be> without writing my own server
04:12 < crazy2be> right now it's using the DefaultServerMux
04:12 < crazy2be> *DefaultServeMux
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04:44 < plexdev> http://is.gd/el5qT by [Robert Griesemer] in 3 subdirs of
go/src/pkg/ -- gofmt: do not modify multi-line string literals
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05:39 < crazy2be> well, it doesn't quite work optimally, since it doesn't
ensure the new program starts correctly
05:40 < crazy2be> but i can provide an emergency interface on another port
05:40 < crazy2be> by just adding http.ListenAndServer(":8081", nil) to the
end of my main funciton
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05:52 < slackstation> Maybe it's just me but, for a language that speaks
about simplicity, Go's syntax kinda makes my brain hurt.  Is it just the years of
C and C++ that make Go look that way?
05:53 < smw> what about go syntax is hard?
05:56 < nelson> no semicolons?
05:57 < vegai> the reversed ordering of types?
05:57 < nelson> required braces (although I'd have gone with Python's
indenting scheme)
05:57 < smw> The named return variables?
05:57 < nelson> := initializing declaration?
05:57 < vegai> make & new?
05:58 < nelson> having to name imported packages inside braces AND quotes?
05:58 < slackstation> more the shape of things from reading the docs for 30
minutes.
05:58 < smw> oh, it must be the semi object like system .
05:59 < slackstation> I'm sure it'll seem natural soon enough but, it's just
feels...  strange.
05:59 < smw> It seems alot like C to me...
06:00 < slackstation> " s := sum(&[3]int{1,2,3})" that just seems very dense
to me
06:00 < nelson> you can put spaces in there.
06:00 < smw> that is very dense...
06:01 < smw> so, don't do that lol
06:02 < smw> slackstation, I can make dense code in almost any language
06:05 < slackstation> It's a strange mix.  I expect dynamic languages to be
pretty dense for scripting but, I can't imagine that for staticly typed,
production code of some sort; I like that c++ and java are verbose because it
kinda makes a meta-narative, meta-comments on the code to give you a clue on
what's going on.  That line would be me looking at that code trying to make heads
and tails of it for a while.
06:06 < smw> slackstation, i can make dense C code too
06:06 < smw> slackstation, what you gave could have been broken up.
06:06 < slackstation> yes, but that code snippet is from the intro docs on
golang.org
06:07 < nelson> I called it!
06:07 < nelson> oh, wait, I didn't.  I just thought about saying "I'll bet
that example is in the tutorial".
06:07 < smw> well, that is because they don't feel like making the tutorial
too long :-P
06:08 < slackstation> smw: sometimes the shortcut is the longest way there
06:08 < slackstation> Here, it's taking me longer to understand even if it's
shorter to write.
06:08 < nelson> The trouble is that they're trying to simplify by giving the
slice function against a constant.
06:09 < smw> slackstation, it does not take long working with go to
understand that...
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06:09 < nelson> but you would never EVER do that in reality.
06:09 < nelson> consequently, it's a bad example.  Just set the variable and
deal with it ....
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06:14 < slackstation> nelson, smw: I agree.  Go could learn alot from the
Ruby and Rails docs in that they are simple, straight-forward and get you going on
code you might actually use after the tutorial.
06:14 < nelson> RoR turned me off on Ruby.
06:15 < nelson> errrr, that would be better said: RoR turned me off Ruby.
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09:35 < nsf> ugh..  next go release will be very painful
09:35 < nsf>
http://groups.google.com/group/golang-dev/browse_thread/thread/8d5342fc17584fa4
09:35 < nsf> my apps rely on these env vars :(
09:36 < rsaarelm> That's pretty big...
09:36 < rsaarelm> Ah, it's all build files.
09:37 < nsf> the problem is that GOROOT and GOOS and GOARCH will not be
available for ordinary apps
09:37 < nsf> I guess I'll add config variables :(
09:37 < rsaarelm> I'd guess it would be easy enough for apps to provide some
runtime way to tell GOOS and GOARCH.
09:37 < nsf> at least for GOROOT
09:38 < nsf> yes
09:38 < nsf> GOOS and GOARCH can be determined at runtime
09:38 < exch> runtime.GOROOT() should still work fine
09:40 < nsf> GOROOT returns the root of the Go tree.  It uses the GOROOT
environment variable, if set, or else the root used during the Go build.
09:40 < nsf> nope
09:40 < exch> may not be handy to rely on though.  the machine you run the
binary on masy be different
09:40 < nsf> it uses the env var!
09:40 < exch> only if set
09:40 < nsf> yes, but other part is totally useless
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09:43 < nsf> I think that the compiler itself should contain valid GOROOT
path
09:43 < nsf> like 8g -goroot
09:43 < nsf> and it will print it back
09:44 < rsaarelm> Yeah, but what if the binary is deployed to a machine with
a different GOROOT?
09:44 < nsf> it makes sense because compiler needs to know that path anyway
(in order to build things)
09:44 < exch> that still makes it useless if the machine has no compiler :)
09:44 < exch> But in that case, relying on GOROOT to begin with is useless
09:44 < nsf> but then GOROOT doesn't make sense
09:44 < nsf> it makes sense only if user has compiler installed
09:45 < nsf> yes
09:45 < rsaarelm> Ah, right, you should assume that a compiler is on the
path for GOROOT to be of any use.
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09:46 < nsf> currently they are relying on gomake to provide that info
09:46 < nsf> but I think gomake is a wrong place for that information
09:46 < nsf> it should be a compiler
09:46 < exch> ah well.  none of my code relies on those vars.  I do need to
fix a bumload of makefiles though
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09:47 < nsf> the problem is: if you'll try to run compiler without gomake
(which sets GOROOT env var) and without GOROOT env var
09:47 < nsf> it will fail
09:47 < nsf> that's why GOROOT should be compiled in
09:47 < exch> If remi'm guessing gomake can be fixed to find out for itself
where it is located instead of needing GOROOT
09:48 < exch> *-the first bit
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09:48 < nsf> anyway, we'll see how it works when the release is here
09:48 * nsf is back to work
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12:36 < taruti> What is that nonsense on the ML that GUI toolkits are not
possible without generics?
12:39 < nbjoerg> haha
12:41 < taruti> as it would be impossible to use some kind of dynamic
dispatch with "methods".  we could even call those values "interfaces".  ;)
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12:44 < rsaarelm> Well, GUIs being originally programmed in the rigidly
statically typed Smalltalk has obviously colored the perception of later
programmers.
12:45 < taruti> rsaarelm: :D
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12:46 < taruti> Having a control(2) like library with both ajax and X11
backends for Go would be very nice
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13:39 < str1ngs> what is the best way to monitor some channels ie after I
have fired off some goroutines I need to wait and make sure they all finish.
13:40 < nsf> you can pass to each goroutine the same channel like 'done chan
bool'
13:40 < nsf> and when they finish they must do 'done <- true'
13:41 < nsf> and then in main goroutine you can make a loop
13:41 < str1ngs> oh so I can use one chanel to watch them all?
13:41 < nsf> like for i := 0; i < Ngoroutines; i++ { <-done }
13:41 < nsf> yes
13:41 < str1ngs> ok thats easier then I thought thank you.
13:44 < plexdev> http://is.gd/elGfM by [Roger Peppe] in go/src/pkg/time/ --
Remove relic "once" import from time/zoneinfo.go
13:44 < plexdev> http://is.gd/elGfR by [Roger Peppe] in go/src/pkg/template/
-- Fix template package so that data items
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14:00 < hokapoka> str1ngs: IIRC there's an example in the tutorial that
doing something very similar.
14:00 < hokapoka> http://golang.org/doc/effective_go.html#parallel <-
here
14:01 < str1ngs> doh I was working down to that.
14:01 < str1ngs> thank you that exactly what I need.
14:02 < hokapoka> ahem, I started to search the docs for NCPU - thinking it
was some constant in go that held the number of CPUs.  Then I noticed the const
NCPU = 4 // number of CPU cores.
14:02 < hokapoka> np
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14:05 < str1ngs> umm guess it would help if I used the keyword go?
14:05 < str1ngs> NCPU = 12 ...  I wish
14:05 < hokapoka> yeah always helps to add the rihgt commands :)
14:07 < str1ngs> that might even explain why time.Sleep wasnt working ..
doh
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14:12 < str1ngs> ok that was way easier then I orginal made it out to be.
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16:52 < exch> is it just me or are these two the wrong way around?
http://github.com/feyeleanor/GoLightly/blob/master/vm/buffer.go#L103
16:55 < nsf> exch: nope, all ok
16:55 < nsf> << and >> expect uint on the right side
16:56 < nsf> but I don't quite understand the point of that API
16:56 < nsf> looks useless
16:56 < exch> yea, but << points to left..  it's in 'shiftright'
16:57 < nbjoerg> yeah, I think he means shifting in the wrong direction
16:57 < exch> aye
16:57 < nsf> ah..  this
16:57 < nsf> yep, probably a mistake
16:59 < exch> goodie, I was beginning to doubt myself.  Though I was missing
some new kind of magic :p
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17:15 < str1ngs> nsf: do you use ^X ^O in gvim or did you re map the
binding?
17:15 < nsf> I use ^X ^O
17:16 < nsf> I should say also that I'm not using it a lot
17:16 < nsf> sometimes I use just ^P or ^N
17:16 < nsf> to save typing time
17:16 < nsf> and when I really forget something, real autocompletion helps
:)
17:16 < nsf> forgot*
17:17 < str1ngs> maybe I should read up on omni completetion then.  before I
did not user it that much but I've been having fun with gocode.
17:17 < nsf> and there are zillions of topics how you can rebind that to
something like tab
17:17 < nsf> yep, I didn't use it either
17:17 < nsf> cause for C++ and C it sucks
17:18 < str1ngs> none work all that great though.  I use to user supertab
for simple stuff.  but I need to do something else.  I think I'll just read up and
use the vim bindings
17:18 < str1ngs> grr hopefully some of that made sense.
17:18 < nsf> :D
17:19 < nsf> use whatever you like
17:19 < nsf> I mean different people prefer different things
17:20 < nsf> regarding vim there is a nice wiki on the web
17:20 < nsf> when you can find a lot of possible options
17:20 < nsf> to choose from
17:20 < nsf> where*
17:22 < nsf> and yes, gocode is better than other autocompletions ^_^
17:22 < nsf> partly because the go is much simpler than other widely used
languages
17:23 < nsf> can't wait when I will finish the refactoring part
17:27 < nsf> I can imagine how hard is it to make proper autocompletion for
languages with templates
17:27 < nsf> I hope go's generics will be somewhat simple
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17:43 < str1ngs> reflection really helps with autocompletion
17:44 < nsf> well it helps because type information is written to .a files
17:44 < nsf> other than that it has nothing to do with autocompletion
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17:47 < str1ngs> right but if it was not for reflection you would have to
use tags or have some keyword list?
17:47 < nsf> btw, if you'll notice that something doesn't work with gocode
17:47 < nsf> let me know
17:47 < nsf> str1ngs: not really
17:47 < nsf> I will make a database format for that purposes then
17:48 < nsf> and gocode will have to preparse all the std lib
17:48 < nsf> and packages imported locally won't work
17:48 < nsf> etc.
17:48 < nsf> it's not as bad as with C
17:48 < nsf> but it's pretty bad
17:48 < str1ngs> so far the only issue was when I was using go HEAD.  but I
switched back to using release.
17:48 < nsf> :D
17:48 < nbjoerg> can it be that 6c doesn't support #elif ?
17:49 < nsf> nbjoerg: yes, it is possible
17:49 < nbjoerg> and it doesn't even complain which is $%#%#$%
17:49 < nsf> afaik 6c doesn't support #if at all
17:49 < nbjoerg> it does
17:49 < nbjoerg> simple ones
17:49 < navigator> nsf: I tried to install gocode on freebsd but it failed.
if I change make to gomake in the Makefile everything compiles fine
17:49 < nsf> ah, maybe
17:49 < nsf> navigator: thanks, I'll make a patch for that
17:50 < nsf> done
17:51 < nsf> And that's all compilation failures
17:51 < nsf> I'm mostly interested in autocompletion failures
17:52 < str1ngs> nsf: but no so far I have not had any issues
17:52 < nsf> I've just noticed one
17:52 < str1ngs> nsf: on OSX or Linux
17:52 < nsf> and fixed it
17:52 < nsf> :D
17:52 < nsf> I'm sure there are more
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17:54 < navigator> nsf: vim/update.sh assumes that bash is in /bin.  Maybe
sh would suffice?  or maybe use /usr/bin/env bash like go
17:55 < navigator> some thing for test/test.bash
17:55 < nsf> yep, that's an issue too :)
17:55 < nsf> I'll make it /usr/bin/env
17:56 < nsf> because python uses that trick all the time, I hope it means
that it is more or less portable
17:56 < nbjoerg> it is
17:57 < nbjoerg> (more portable)
17:57 < nbjoerg> but not depending on bash would be even better, of course
:)
17:57 < nsf> Go uses it
17:57 < nsf> and my app doesn't really depend on it
17:57 < nbjoerg> I hope the former can be fixed at some point
17:57 < nsf> just uses for helper scripts
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17:58 < nsf> done
17:59 < nsf> also my testing script depends on python 2.6
17:59 < nsf> some people still use python 2.5 and lower
17:59 < nsf> and frankly I don't understand these people
18:00 < nsf> 2.6 final was released two years ago
18:00 < nsf> afair
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18:01 < nbjoerg> compatibility with older programs
18:01 < nbjoerg> or they are running RHEL
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18:05 < nsf> go's GC is really slow
18:05 < str1ngs> ok I think I'm doing something wrong here.  do I need to
make a package for every struct I use?  foo.Foo seems like I'm doing this wrong.
18:06 < nsf> uhm..
18:06 < nsf> what do you mean?
18:06 < nsf> why are you making a lot of packages?  :)
18:07 < str1ngs> let me post some code.
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18:08 < str1ngs> http://github.com/str1ngs/via/blob/master/plan/plan.go
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18:09 < str1ngs> if I dont put them in packages.  then things I have in
package and not use them.  or should I just put it all in main?
18:09 < str1ngs> cant not*
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18:10 < nbjoerg> nsf: it hasn't been a major focus point of implementation
so far, has it been?
18:10 < nsf> I think you should use "main" until your app will be reasonably
large
18:10 < nsf> nbjoerg: I guess so
18:11 < nsf> but its performance impact is really noticable
18:11 < str1ngs> nsf: ok I think thats where I was going wrong.  and I can
still keep them organized with seperate files.
18:11 < nsf> str1ngs: sure you can
18:11 * nbjoerg is still using a lock() implementation that just yields, so don't
talk about performance impact, please
18:11 < str1ngs> nsf: thanks
18:12 < nsf> str1ngs: take a look at go's math package
18:12 < nsf> it contains a lot of files
18:12 < nsf> but everything in a one package namespace
18:12 < str1ngs> ah so if I'm targeting Make.Cmd then its not much different
other then its in main
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18:13 < nsf> if you have just one package, simply list all your .go files in
GOFILES
18:13 < nsf> and you're done
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18:15 < nsf> makefiles are painful :(
18:15 < str1ngs> well the only issue is I use init() for dynamically adding
metadata.  so I thought if I put that in a package it could be independant of the
binary.  however I dont think that works.  since all package get statically
included in the exec anyways?  I could be wrong on this.
18:16 < nsf> yes, everything is statically linked
18:16 < nsf> so..  everything you have is added at app's start
18:16 < str1ngs> ok so package wont help that.  so I'll switch back to
having everything in main scope
18:17 < nsf> yes
18:17 < nsf> currently Go doesn't have any kind of facility that will allow
you to dynamically load the code
18:17 < nsf> but it is planned I guess
18:18 < nsf> it will be in some form sooner or later
18:18 < nsf> and most likely it will not be in a form of shared libararies
18:18 < nsf> libraries*
18:18 < str1ngs> init it fine for now.  unless I switch to yaml or something
like that.  but that wont handle logic or func types I dont think
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18:18 < nsf> str1ngs: your init is not even necessary
18:18 < str1ngs> http://github.com/str1ngs/via/blob/master/plans/lsof.go in
this ?
18:19 < nsf> yes
18:19 < nsf> because you're adding the same info at each runtime over and
over again
18:19 < str1ngs> ah ok
18:19 < nsf> you can simply put one big table somewhere
18:19 < nsf> that contains multiple entries
18:19 < str1ngs> I'm using a map right now
18:19 < nsf> but you're adding entries dynamically to it
18:20 < nsf> I mean something like:
18:20 < nsf> var All = map[whatever]whatever{ ...  }
18:20 < nsf> well, init will work too
18:20 < nsf> but I think it's a large misuse of a feature
18:20 < str1ngs> I'll see if I can drop the init
18:21 < str1ngs> this whole thing is a misuse imo but fun
18:21 < nsf> :)
18:21 < str1ngs> basically PKGBUILD's written in go
18:21 < nsf> and I don't think it's a good idea either
18:21 < nsf> :D
18:22 < nsf> Go isn't a scripting language
18:23 < str1ngs> well there are merits to this vs bash.  goroutines for
concurrent builds/downloads.  less dependancies on forks even though I am using
them right now.
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18:23 < str1ngs> func hooks for redundant stuff.  for example my GnuBuild.
18:23 < nsf> well, you can implement parallel downloader in Go
18:23 < nsf> but doing what you're doing is wrong (imho)
18:24 < exch> here's a puzzle for you math geeks: 0 degrees celcius + 0
degrees Celcius = ?
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18:25 < str1ngs> nsf: remember they said that to the Wright brothers :P
18:26 < nsf> I don't mean that you should stop doing that, do whatever you
want, but looks pointless to me :D
18:27 < str1ngs> its seems pointless.  but I have some applications I would
like to use it in.  orginally I was going to write it in ruby.  but I'm having to
much fun with Go.
18:27 < nsf> I think the ruby is a better choice for that task
18:29 < str1ngs> I agree, but I'm already in the rabbits hole so I might as
well see where it leads.
18:29 < nsf> :)
18:29 < str1ngs> worst case I use PKGBUILD's and basically rewrite makepkg
in go
18:30 < str1ngs> but I rather not parse PKGBUILD's would not work that great
or wrap bash to do it would defeat the purpose.
18:30 < nsf> PKGBUILD are shell scripts
18:30 < nsf> their biggest problem is exactly that
18:30 < nsf> PKGBUILDs*
18:31 < nsf> I remember there was some kind of discussion about it
18:31 < str1ngs> we'll see I'll just chalk it up as an exercise is Go. to
justify my goals
18:31 < nsf> but apparently nothing was changed
18:32 < nsf> ok, good luck to you then :)
18:33 * nsf is gone for a movie
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19:17 < nbjoerg> wtf
19:17 * nbjoerg wants to murder to 6c authors
19:17 < crazy2be> why?
19:18 < nbjoerg> uint64 foo =1; if (foo) magic();
19:18 < nbjoerg> gives a warning for the "if (foo)" part that the result of
operation is not used
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19:20 < nbjoerg> does that qualify as issue?
19:21 < taruti> nbjoerg: use USED(foo)
19:21 < nbjoerg> that's not that point
19:22 < nbjoerg> the point is that "if (foo)" and "if (foo != 0)" are
different
19:22 < taruti> ah
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19:28 < nbjoerg> hm.  do i want to spend a lot of time on writing
lock/unlock in a way that is starvation free or not
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21:40 < nickaugust> is there an example binary tree implemtation in go?
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21:40 < nickaugust> implementation rather
21:40 < nbjoerg> there is a r/b tree implementation somewhere
21:40 < nbjoerg> so yes
21:40 < nsf> search ML
21:40 < nbjoerg> "at least one form of binary tree is implemented"
21:40 < nsf> it was there
21:41 < nbjoerg> is osinit always called before lock/unlock/noteclear?
21:41 < nickaugust> k thx
21:41 < nsf> http://github.com/petar/GoLLRB
21:41 < nsf> nickaugust: here it is
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21:43 < nickaugust> nsf: thanks man :)
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21:49 < plexdev> http://is.gd/emcyf by [Scott Lawrence] in go/src/ --
Make.common: add .PHONY rule
21:49 < plexdev> http://is.gd/emcys by [Russ Cox] in go/ -- CONTRIBUTORS:
add Luuk van Dijk (Google CLA)
21:49 < MaybeSo> given a token 'tok' of xml.CharData, does one really need
to convert it to a string via string([]byte(tok)) ?
21:56 < exch> yes
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22:01 < MaybeSo> exch: it used to be one could write string(tok), did you
happen to know if that changed because of a change in the spec or because of a bug
fix?
22:04 < mimustafa> clear
22:06 < exch> that changed quite a while ago.  Something about no longer
doing certain implicit conversions
22:06 < MaybeSo> thank you
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22:12 < nsf> it was *[10]byte to []byte I guess
22:12 < nsf> but maybe I'm wrong
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22:21 < plexdev> http://is.gd/emeWm by [Robert Griesemer] in
go/src/pkg/reflect/ -- reflect: allow PtrValue.PointTo(nil)
22:21 < plexdev> http://is.gd/emeWq by [Luuk van Dijk] in
go/src/pkg/runtime/ -- runtime: correct line numbers for .goc files.
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23:10 < plexdev> http://is.gd/emhVX by [Russ Cox] in go/src/pkg/rpc/jsonrpc/
-- jsonrpc: use `error: null` for success, not `error: ""`
23:12 < nbjoerg> hm.  nil pointer access creates crash: check
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23:21 < skelterjohn> ^5
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23:38 < matt444> what's the best way to test a string for being empty?
(len(s) == 0?)
23:39 < skelterjohn> sure
23:39 < KirkMcDonald> Or: if s == ""
23:39 < skelterjohn> the most straight forward way for code readability
would probably be s == ""
23:39 < skelterjohn> but len(s)==0 could conceivably be faster
23:39 < matt444> oh :_
23:39 < matt444> of course :)
23:40 < KirkMcDonald> A sufficiently intelligent optimizer can figure it
out!  Heh.
23:40 < Namegduf> s == "" is good.
23:40 < Namegduf> There's other special stuff about "".
23:40 < Namegduf> "" is the zero value for a string.
23:40 < Namegduf> In terms of memory.
23:41 < Namegduf> So I assume there's already extra magic around it.
23:41 < nbjoerg> looking for testers for
http://www.netbsd.org/~joerg/ipv6_v6only.diff
23:42 < nbjoerg> it is supposed to make the v6only hack obsolete
23:42 < skelterjohn> if a string's memory layout is just length then
pointer, then nothing special has to be done to make "" the zero-value
23:42 < Namegduf> Aside that, presumably
23:42 < Namegduf> string1 == string2
23:42 < Namegduf> Must examine the length already
23:42 < Namegduf> And before it examines the string proper
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23:42 < skelterjohn> i imagine that's how it's done, yes
23:43 < Namegduf> So len(s) == 0 is likely equivalent to s == "" already.
23:43 < skelterjohn> only if the compiler knows to not allocate memory for
the ""
23:43 < skelterjohn> which it probably does
23:44 < Namegduf> It certainly wouldn't allocate anything at runtime
23:44 < Namegduf> Because it's a constant.
23:44 < crazy2be> well it's an empty string
23:44 < Namegduf> As much as 0 is.
23:44 < crazy2be> and strings are immutable
23:44 < crazy2be> right?
23:44 < crazy2be> and it's a constant
23:45 < skelterjohn> has to at least be loaded into a register to be
compared
23:45 < skelterjohn> 0 takes fewer words than ""?
23:45 < skelterjohn> it's irrelevant, anyway
23:45 < skelterjohn> s=="" is clearer
23:45 < skelterjohn> and if not just as fast, so close as to not matter
23:45 -!- slackstation [~eman@adsl-69-231-151-35.dsl.irvnca.pacbell.net] has quit
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23:45 < Namegduf> Well, the Go team accept patches.
23:45 < skelterjohn> lol
23:46 < crazy2be> you could just add a comment: // Test if s is empty
23:46 < crazy2be> that would be clearest
23:46 < Namegduf> So if I wanted to optimise stupid stuff like that, I'd
offer a patch instead of crapping all over my code.
23:46 < Namegduf> And save everyone else the time, too.
23:46 -!- matt444 [601c2542@gateway/web/freenode/ip.96.28.37.66] has quit [Ping
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23:46 < skelterjohn> easier to crap on your code than to patch a compiler
23:46 < exch> I think there are more pressing concerns atm :p
23:47 < Namegduf> Yes, but unless my code is going to fail TODAY unless I do
that microoptimisation
23:47 < skelterjohn> like whether you can add celsius and fahrenheit or not
23:47 < Namegduf> I can leave my code alone until I feel up to, or someone
else, improves the compiler.
23:48 < exch> On a similar note, what does 'case a, b, c, d:' turn into?
would this be faster than 4 independant case statements or is it just syntactic
sugar?
23:48 < exch> skelterjohn: exactly :p
23:48 < exch> in this case, celcius + celcius ;)
23:49 < exch> My mind is still boggled about that..  0C + 0C = 273.15C
23:49 < Tonnerre> Kelvin++
23:49 < skelterjohn> it does not make sense to add temperatures together
23:49 -!- ibaned [~ibaned@cpe-74-67-20-150.nycap.res.rr.com] has quit [Quit:
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23:49 < Tonnerre> Well it does
23:49 < exch> yea apparently
23:49 < skelterjohn> oh, did google do it?
23:49 < exch> google had the corretc answer with that
23:49 < Tonnerre> 23°C + 5K = 28°C
23:50 < exch> wolfram|alpha yields 0C as answer
23:50 * crazy2be is confused
23:50 < crazy2be> where is that from?
23:50 < skelterjohn> 0C = 273.15K
23:50 < skelterjohn> where 0K is the coldest anything can get
23:50 < crazy2be> yeah
23:50 < crazy2be> but where did the 0C + 0C come from?
23:51 < skelterjohn> exch is just fooling around with automatic expression
evaluators
23:51 < exch> 0C + 0C = 273.15K + 273.15K = 546.30K = 273.15C
23:51 < crazy2be> oh
23:51 < exch> that's basically what it's about.  but wolfram gets it wrong
23:51 < KirkMcDonald> hahaha
23:51 < skelterjohn> "wrong"
23:51 < crazy2be> hmm
23:51 < skelterjohn> problem is, 0C isn't zero anything
23:52 < Tonnerre> exch, scientifically correct (the 546.3K)
23:52 < skelterjohn> if you can't rely on the basic arithmetic axioms, you
can't do things like addition
23:52 < exch> I think the message is that it makes no sense to add nC to
anything
23:52 < skelterjohn> yes
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23:55 < exch> it's a neat party trick though :p
23:56 < Tonnerre> «I'm adding 0°C, it's getting hot in here»
23:56 < exch> hehe
--- Log closed Wed Aug 18 00:00:05 2010