--- Log opened Tue Aug 16 00:00:20 2011
00:00 < sl> it's pretty great from what i can tell but i don't have a lot of
experience with it yet.  i'm not really a c programmer.
00:01 < str1ngs> neither am I . why I use go :P
00:01 < str1ngs> well I guess I can hack C when I have to
00:01 < sl> str1ngs:
http://doc.cat-v.org/plan_9/4th_edition/papers/acidpaper
00:02 < sl> i believe there is some sort of attempt at replicating acid's
functionality included with plan9port but i'm not sure.
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00:02 < str1ngs> hmm not sure if this will help you on the linux side of
things
00:02 < str1ngs> apt-get install strace might be easier
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00:03 < sl> str1ngs: previously we've been able to debug linux problems by
tracing the plan 9 process it corresponds too; it's cumbersom but you can extract
the needed information.
00:03 < str1ngs> sl: hmm if you are use to that method then that might be
better
00:03 < str1ngs> just strace is what I'm use to
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00:03 < str1ngs> atleast for this issue should stand out like a sore thumb
00:04 < sl> i'm not sure strace would work given how the emulation is done,
but i don't know enough about it.
00:04 < str1ngs> hmm I can strace here though see what it touches
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00:05 < sl> bbl, have to finish up some work.  thanks again.
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00:09 < str1ngs> np
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01:43 < chilts> anyone got ops to kick Stiletto, it reconnects every 5 mins,
24hrs a day
01:44 < leterip> lol someone needs to implement the ping handler on their
bot i guess
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02:17 < kevlar> it looks like a broken bnc.
02:19 < knowmercy> /kick Stiletto
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02:27 < f2f> you want to ban the bot, really.
02:27 < f2f> kicking won't do much good
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02:54 < s|k> nice
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02:55 < s|k> Stiletto: you're parting and joining a lot
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02:58 < chilts> I don't think it's a person, it's doing it every 5 mins the
whole day ...  so yeah, banning would be better
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04:28 * smw begs adg to bad Stiletto.  Too much join/part spam.
04:29 < str1ngs> if you use weechat /filter add irc_smart * irc_smart_filter
*
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05:13 < s|k> I use weechat
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05:14 < s|k> I like it
05:14 < s|k> I also like go
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05:14 < s|k> so much to like about go
05:14 < cbeck> A controversial statement in this channel, to be sure
05:15 < s|k> My favorite new thing?  Being able to pass slices into variadic
function parameters
05:15 < s|k> also defering
05:15 < cbeck> So, this may be a dumb question, but what would the easiest
way to tell that a network connection has died?
05:16 < str1ngs> most connection block no?
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05:20 < Jzalae> if it's the sort of dead that doesn't produce an error from
the protocol, you may end up adding a ping to your layer.  most lower level
protocol timeouts are pretty long, from what i've seen
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05:21 < cbeck> Yeah, I'm poking things with netcat to figure out the best
way to go about it
05:22 < Jzalae> i guess what i should be saying is that it might help to
know what protocol stack you've got
05:22 < cbeck> IRC
05:22 < cbeck> So no predefined ping interval
05:22 < Jzalae> yeah, but you can ping the server anytime, IIRC
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05:23 < cbeck> I believe you're right, at least for all the servers I've
played with
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05:34 < kevlar> cbeck: IRC has PING/PONG and you can send them whenever.
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05:34 < kevlar> xchat, for instance, does a ping roughly once every 30
seconds
05:34 < kevlar> most servers are also configured to ping clients on some
interval, often 90 seconds for users and 5 minutes for bots, opers, and other
servers
05:36 < cbeck> I'd just spaced that clients could send PINGs to the server
as well
05:37 < kevlar> IRC is a TCP protocol though, so you can often get the same
behavior by just setting TCP KeepAlive
05:37 < kevlar> and set it to some suitably frequent amount
05:37 < kevlar> which will catch when the route fails.
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05:38 < kevlar> oh hmm, (*TCPConn).SetKeepAlive(bool) only turns them on and
off.
05:38 < kevlar> should help though.
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05:45 < cbeck> kevlar: I think that'll work just fine
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05:45 < cbeck> Danke
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07:51 < kuroneko> cbeck: My solution to that is to have an idle timer which
triggers a NOP in the protocol.
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07:51 < kuroneko> if the connection is dead, that'll be enough to cause it
to actually trip and then you handle it however.
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07:52 < kuroneko> PING/PONG is a good NOP for IRC.  :)
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08:11 < hokapoka> Anyone used the exp/template package to use the comparison
of 2 strings as a pipeline to if?
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08:11 < hokapoka> God, I never thought I'd be asking how to use an if
statement!
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11:16 < Argue> the idea with go's concurrency is to use channels when we
would otherwise use mutexes, right?
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11:17 < Argue> what's the appropriate pattern to use when i want to make
sure there's no racing when one goroutine is appending to a slice while another
periodically empties it out and sends the data somewhere?
11:18 < ww> Argue: you could use a buffered channel instead of a slice
11:18 < uriel> or you could have a single goruotuine that selects on two
channels
11:18 < uriel> one of them adds stuff to the slice
11:19 < uriel> and maybe the other gives it a notification to empty it
11:20 < uriel> usually the best is to think as a structure being 'owned' by
a goroutine, and only have that goroutine perform all necessary operations on that
structure, unless it 'passes' it to somebody else via a channel
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11:22 < Argue> okay, i think i can do that.  i think i was doing something
wrong before and my goroutines were blocking more than were necessary.
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11:46 < uriel> Argue:
http://blog.golang.org/2010/07/share-memory-by-communicating.html
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12:30 < ww> silly question...
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12:30 < ww> how can i index a C array of unsigned char?
12:30 < ww> having trouble coercing go's casting into letting me do the
usual pointer arithmetic...
12:31 < ww> and the [] notation doesn't seem to work...
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12:41 < ww> or...  how do i assert a C array into a Go array?
12:41 < ww> argh
12:43 < niemeyer> ww: Hmmm
12:43 < niemeyer> ww: There are a few ways
12:43 < nicka> I can't really help you but moving the manipulations you need
to do to the C array into C code might be easier
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12:44 < niemeyer> ww: http://tip.goneat.org/cmd/cgo/
12:44 < niemeyer> ww: Check out the bottom of the page
12:44 < niemeyer> ww: You want these conversion functions
12:44 < ww> nicka: don't need to manipulate, just need to iterate over it
once
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12:45 < ww> aha!  niemeyer GoBytes!
12:45 < ww> i think that will work...  (possibly it makes a copy which is
wasteful, but the array's not large so, meh)
12:46 < ww> oh no.
12:46 < nicka> You could write an indexing function too
12:47 < ww> don't tell me C.GoBytes is only in tip
12:47 < nicka> To take out individual elements which you could then work
with
12:47 < ww> nicka: yes, i could, but that seems pretty brain damaged when
the elements are just unsigned chars
12:47 < ww> too many hoops
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12:47 < nicka> cgo is a series of hoops
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12:51 < niemeyer> ww: You can use GoString meanwhile
12:51 < niemeyer> ww: and []byte() it
12:51 < niemeyer> ww: With a // TODO:..  :-)
12:51 < ww> niemeyer: yes, that's what i've done
12:52 < ww> buf := []byte(C.GoStringN((*C.char)(unsafe.Pointer(code.data)),
C.int(len(rgba.Pix))))
12:52 < ww> most ugly but...  i think it might work, and that's the more
important bit...
12:52 < ww> (bindings for the qrencode library fwiw)
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12:53 < nicka> I still think a single function in the cgo file to get
individual bytes would be much cleaner and easier
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12:53 < ww> nicka: whilst an extra copy or two is one thing...
12:53 < ww> ...  an extra call into c for each byte is another
12:54 < ww> ...  and doesn't lend itself to easily moving to the C.GoBytes
which is exactly what i need
12:57 < nicka> fair enough
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13:04 < ww> success!
13:04 < ww> qr encoding with the go!
13:05 * ww lunch
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13:16 < knowmercy> morning
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14:12 < Halavanja> I have several webservers that are talking to each other
to complete several resource management tasks and I have alot of common bits that
I would like to take out.  In GO is there a way to make the code more polymorphic?
For instance I have several times where I have a json request that I unmarshall
and put into a type.  Is there a generic way to get that type into the function
and return?
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14:15 < hokapoka> Halavanja: are you saying that you want a generic function
that returns a different type based on the JSON sent?
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14:15 < Halavanja> Yes something ilke that
14:16 < hokapoka> If you have a function that returns interface{} the you
can type asert it once you have recived the result.
14:18 < Halavanja> I read about interfaces but don't fully understand them
just yet.  Though that was my avenue.  Lets say that I do that.  Is the function
call like assert({}interface, someType}?
14:18 < hokapoka> res, err := GenUnmarshall(json, type); if err != nil { /*
handle the error */ return; } typ := res.(YourType);
14:18 < hokapoka> s/type/theType/I
14:19 < Halavanja> that seems really easy.
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14:19 < Halavanja> I will have to try that
14:19 < hokapoka> Halavanja: the 1st param in the JSON, the 2nd it an value
you can switch against to handle the unMarshalling.
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14:20 < hokapoka> The other option is to pass a pointer to the var you want
to unmarshall into.
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14:21 < hokapoka> var obj MyType; err := GenUnmarshall(json, &MyType); if
err ...
14:21 < Halavanja> I guess that would work as well.  In go are pointers just
intergers like in C
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14:22 < Halavanja> and the type in the first example is does that have the
function of {}interface (like that) or do i pass it something else?
14:23 < hokapoka> Then use the reflect package and switch obj.(type)
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14:24 < hokapoka> My first example I was thinking about passing some value
that you can use to switch against in the Generic unmarshaller.
14:24 < hokapoka> eg : const ( T1 = itoa; T2; T3; T4; )
14:24 -!- Nisstyre [~nisstyre@infocalypse-net.info] has quit [Ping timeout: 264
seconds]
14:25 < hokapoka> As you will need to declare a var obj Type1 within the
generic unmarshaller.
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14:26 < hokapoka> So you'll need some way of knowing which type you need to
unmasrhal into, yeah/
14:26 < Halavanja> Okay.  I since I am kind of doing that in the code now it
will just be a matter of passing that type into the fuction.
14:28 < hokapoka> func GenUnmarshal( jsonStr string, theType int) (res
interface{}) { switch theType { case T1: var obj Type1; /* json.Unmarshal...  */
res = obj; } return res }
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14:30 < Halavanja> The type in my example are a number of stuctures.  Would
I be able to pass it as "theType" if the structures are all different?
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14:31 < Halavanja> eg: NewType1{int int string}, NewType2{Foo, baz, int} ...
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14:34 < hokapoka> No, my example was passing a value that you can use to
switch against so you know the type you want to unmarshall into.
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14:35 < niemeyer> ww: Hah, neat..  I looked at qrencode just over the
weekend
14:35 < hokapoka> However, you could pass a pointer to an instance and then
use the reflect package to asertain the type that you're looking to reflect into.
14:35 < Halavanja> So basically all the same type all of the time.
14:35 < Halavanja> hokapoka: I will take a look at how reflect works
14:36 < Halavanja> by passing it a pointer to the function, is it still an
int or seen as a *pointerType
14:36 < hokapoka> Halavanja: I gave you 2 options.  1 pass the JSON and some
other identifier so you know what type you need to unmashall into.  In this case
you can return interface{} and use type assertion once you have recieved the
result.
14:38 < hokapoka> 2, pass the JSON and a pointer to an instance of the type
you want to unmarshall into, this would mean the 2nd param would be interface{}
and use the reflect package to asertain which type you need to unmarshal into.
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14:39 < hokapoka> var obj MyType; GenUnM(json, &obj); func GenUnM(jsonStr
string, obj interface{}) { ...  }
14:40 < Halavanja> hokapoka: I will take a look at both of those.  Thank
you.  Somehow it will help me remove some of the boiler plate in my code.
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14:43 < hokapoka> Halavanja: I'm not sure how much different either of these
are to using the standard json package directally, all you need is : var obj
MyType; err := json.Unmarshal(data, &obj); if err != nil { ...  }
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14:44 < Halavanja> hokapoka: I know they are not that different.
14:45 < Halavanja> hokapoka: What I wanted was basically a generic interface
so that I can call it in a single place and handle all of the json bits inside
there and return a type that I was going to use.  That woudl remove atleast 7
lines of code per call.
14:46 < hokapoka> Right, maybe it's better to have a Generic func for each
type.
14:46 * hokapoka srugs
14:46 < Halavanja> yeah thats how i feel haha
14:46 < Halavanja> because having a generic func for each type would be the
same as doing the json unmarshall each time
14:47 < Halavanja> with a few minor variances
14:47 < hokapoka> obj, err := genjson.NewType1(json);
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14:48 < Halavanja> Yeah that is possible but if i have lets say 10 NewTypes
I have 10 functions that all repeate the code :(
14:48 < Halavanja> or atleast thats how I see it
14:48 < hokapoka> Exactally, I didn't concider that.  On the oter hand if
you have a Func for each type at least that'll clean it up abit.
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14:49 < Halavanja> yes and no based on how I have it.  Yes it would clean it
up a bit doing it that way but its still repeated.  I was just hoping for a more
polymorphic solution is all
14:49 < Halavanja> So I would only have to return once and then convert the
type/return the type
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14:50 < hokapoka> Are you unmarshalling the same types in a number of
different places?
14:50 < Halavanja> more like unmarshalling different types in different
places.  Usually per server
14:50 < Halavanja> so my thought was this
14:51 < Halavanja> typeUsed, err := jsonRet(json)
14:51 < Halavanja> so that woudl return the unmarshalled data into a type in
typeUsed
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14:52 < hokapoka> yeah, that would work, but you would have to subsequently
type assert with : useThis := typeUsed.(theType)
14:52 < Halavanja> so then I can throw that in my main server class they all
share and return types approriately
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14:54 < hokapoka> Additionlly, you would need to pass something to allow
jsonRet to know what type it need to unmarshall into.
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14:54 < hokapoka> Sorry, maybe someone else has some better ideas.
14:54 < Halavanja> yeah.  its one of those things that I think is kind of
new/not new but few people have done?
14:54 < Halavanja> or something like that
14:55 < Halavanja> its a good exercize to see what can be done in the
language for future reference
14:56 < Halavanja> I just happened to notice I was doing that alot and
wanted to stream line it
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15:00 < ww> niemeyer: qrcodes are fasionable these days...
15:00 < niemeyer> ww: A really cool project, though, would be to port zxing
to Go..  (hint!  hint!)
15:01 * ww now will have some fun with stickers and laser printers...
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15:01 < ww> zxing, maybe...  signal processing facilities for go would be
nice...
15:02 < hokapoka> Halavanja: When I've done it in the I just had a struct
with a method for each type.  While it ment I had to add a number of methods,
whereever I needed to unmarshall the JSON it was a single statement.  Additionally
I let it panic as I was recovering higher up the stack.
15:02 < ww> but for that particularly, why?
15:02 < ww> client devices are mostly phones and tablets and things that
only approximately run go if at all
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15:03 < ww> ...  unless you want some sort of software agent that downloads
pngs of qr codes and interprets them but again...  how useful is that?
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15:07 < Halavanja> hokapoka: yeah that is definitely the way to go with it
and what I've done with most of the code.  It was just a crazy idea I had is all.
Right now its basically a fucnction in the struct that I am sharing that does the
request reading and returns some bytes that I then have to unmarshall into a type.
Not ugly but it woudl have been nice to kind of encapsulate that.
15:07 < Halavanja> hokapoka: no big deal
15:08 < ww> niemeyer: anyhow, https://bitbucket.org/ww/qrencode first cut at
some bindings
15:08 < ww> ...  and a little example program
15:08 < niemeyer> ww: signal processing?
15:09 < ww> uriel: ^^ yet another C binding
15:09 < niemeyer> ww: zxing is likely the best qr/barcode encoding/decoding
open source library available
15:10 < Argue> what is wrng with this: "fooPointer = &foo.Foo{ something }"
where Foo has a single field, and it's unexported
15:10 < Argue> i get "implicit assignment of unexported field"
15:10 < ww> niemeyer: generally...  fourier transforms, high/low pass
filters, etc.  etc.
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15:11 < niemeyer> ww: Sure, but that wasn't the point..  I was just saying
that what would be really awesome would be to port zxing for qrcode/barcode
processing, rather than wrapping qrencode
15:11 < niemeyer> Argue: Hmm..  you described the issue already..  not sure
about what's the question?
15:11 < ww> oh sure, i would have happily used a native go library...
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15:12 < niemeyer> Argue: It's unexported..?
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15:12 < Argue> is it not possible to initialize unexported fields in a
literal?
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15:12 < ww> if someone were to port zxing, i would suggest to them to
concentrate on the encoding, not the decoding...  easier and more useful...
15:13 < ww> but that someone isn't me, i've tastier fish to fry :)
15:13 < niemeyer> Argue: unexported fields are unexported
15:13 < niemeyer> Argue: You can't touch/initialize/fiddle with them
15:13 < niemeyer> Argue: outside of their own package
15:13 < Argue> i could have sworn it was possible to set them when
initializing but i guess i was mistaken
15:13 < Argue> oh outside of their own package
15:14 < Argue> that explains why i never had a problem with that before
15:14 < Argue> haha
15:14 < Halavanja> Argue: you should be able to set it inside the package
15:14 < Halavanja> yeah
15:14 < Halavanja> if its outside you are out of luck
15:14 < Halavanja> it must become exported haha
15:15 < Argue> this is my first time to try making something with more than
one package so that one was a gotcha for me
15:15 < Halavanja> Argue: I know the feeling
15:16 < Argue> i still haven't even figured out how to get the makefile
working so i just ended up writing down every step manually
15:16 < Halavanja> Argue: ew.  Thats not really fun at all.
15:17 < Argue> yeah
15:17 < Argue> i'll get around to fixing the makefile later on
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15:17 < Halavanja> http://pastebin.com/CzSu4RYy
15:17 < Halavanja> try that
15:17 < Halavanja> replace "theprog" with your program's name
15:18 < Argue> that's the one i was using
15:18 < Argue> i got some error that i can't recall
15:18 < Halavanja> ah oka
15:18 < Halavanja> yeah you have to make sure its all in the same package or
you have to make another Makefile in another directory
15:18 < Halavanja> its kind of a pain
15:18 < Argue> oh
15:18 < Argue> that makefile only works for one package?
15:18 < Halavanja> Yeah.
15:19 < Argue> that also answers my other problem then
15:19 < Halavanja> I haven't been able to move it to create multiple
packages with one makefile unless I use the C style
15:19 < Halavanja> but that is kind of messy too
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15:20 < hokapoka> I prefer using goinstall over makefiles now.
15:20 < qeed> i dont like goinstall since you have to make a whole directory
structure for a simple program
15:20 < Argue> i didn't want to use goinstall for things i was just playing
with
15:21 < Halavanja> im using goinstall for my current project
15:21 < Halavanja> its nice
15:21 < nicka> Give gb a look
15:22 < hokapoka> qeed: when you say "a whole directory structure" you're
reffering to haveing to initially set one up?
15:22 < jessta> qeed: a simple program isn't going to have multiple packages
15:22 < qeed> yeah
15:23 < qeed> have to make project/src/project which makes project/bin and
project/pkg
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15:25 < jessta> qeed: you just need to have a seperate directory for each
package in your app
15:26 < qeed> i like the C setup more a top directory build script and
source code in src/ since i write small apps i dont use make pkgs
15:27 < jessta> a simple app should only have one package 'main' so you
don't need any other directories
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15:28 < qeed> yeah i used goinstall before for simple apps i just use
makefiles for bigger stuff i use goinstall
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15:29 < ericvh> ajray: I wish I had convinced you to do this….
15:29 < hokapoka> even when I create a small app I just add a directory to
one of my GOPATHs, a .go file and goinstall /path/to/simple && simple
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15:34 < mpl> ww: is there any native (or not) FFT lib available for go that
you know of?
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17:22 < mkb218> i was able to use djbfft through cgo very easily
17:22 < mkb218> go-fftw is a thing
17:22 < mkb218> i haven't been able to get it working however
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18:01 < Halavanja> I'm trying to do a switch statement based on the
variables type so that I can run operations on it.  So far when I do the case
statement ,as int for example, it says that int is not an expression.  Is there
anyway to make it so that it will find the type and become a statement?
18:02 < Halavanja> I am using the reflect package to find the type of the
variable that i am switching on if that helps
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18:03 < nicka> Post a code snippet
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18:05 < Halavanja> http://pastebin.com/dAEZwCkC
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18:08 < s|k> if a go program runs as a user it requires extra settings in
order to run in parallel?
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18:08 < s|k> GOMAXPROCS must be set right?
18:09 < s|k> interpreting 'user-level' as running as say a regular user on
linux, maybe I'm confused
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18:15 < nicka> http://golang.org/pkg/reflect/#Kind Halavanja
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18:19 < nicka> I'm not sure what to say generally, I haven't used the
reflect package much
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18:25 < niemeyer> Halavanja: Yeah, there is
18:25 < niemeyer> Halavanja: What you want is reflect.Int, rather than
int.Kind()
18:27 < Halavanja> niemeyer: I used that and it didn't work for me
18:27 < niemeyer> Halavanja: It works
18:28 < niemeyer> Halavanja: If you can tell what exactly you did, I can
help
18:28 < Halavanja> You are right it did work.  I don't know what I was doing
wrong.
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18:28 < niemeyer> Halavanja: println(reflect.ValueOf(1).Kind() ==
reflect.Int)
18:28 < Halavanja> Now how can I do that for types that are not the standard
type in flect
18:29 < Halavanja> *reflect
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18:29 < Halavanja> such as my foobar type
18:29 < niemeyer> Halavanja: Ok..  there are two different things
18:29 < niemeyer> Halavanja: Kinds and Types are orthogonal
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18:29 < niemeyer> Halavanja: The Kind of your type will be something like
reflect.Struct, or reflect.Int, or whatever
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18:29 < niemeyer> Halavanja: The Type of your type will be
reflect.TypeOf(yourvalue)
18:30 < niemeyer> Halavanja: You can switch on that
18:30 < niemeyer> Sorry, the Type of your value is what I meant
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18:33 < Halavanja> niemeyer: so how can i get that to be set for my switch
for something like an *int or have it find a reflect.TypeOf(int)?
18:34 < niemeyer> Halavanja: reflect.TypeOf(1)
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18:34 < niemeyer> Halavanja: Do you really want that, though?  Why isn't
Kind() == reflect.Int enough?
18:35 < niemeyer> Halavanja: This check will mean it will really only work
with ints, when in fact it's very likely that _any_ types based on int would work
18:35 < niemeyer> E.g.
18:35 < niemeyer> type myint int
18:35 < niemeyer> reflect.ValueOf(myint(1)).Kind() == reflect.Int
18:36 < Halavanja> that works fine as it is yes
18:36 < Halavanja> but what if I want a kind that is not an int
18:36 < Halavanja> such as in my switch
18:37 < niemeyer> Halavanja: Right..  then you do
reflect.TypeOf(valueofyourtype) == reflect.TypeOf(valueofosmethingelse)
18:37 < niemeyer> and switch accordingly
18:37 < niemeyer> int is a bad example, though..  it's generally
unnecessarily restrictive
18:38 < Halavanja> Yes and thats why I'm kind of confused.
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18:39 < Halavanja> because you are basically saying that I have some type,
initalize it and then find its kind check for equality and then use that
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18:39 < Halavanja> it works for simple types but if i have a huge structre
that is kind of a pain
18:39 < Halavanja> or im just not comprehending properly
18:39 < Halavanja> which is possible
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18:42 < niemeyer_> Halavanja: No, that's not what I'm saying
18:42 < niemeyer_> Halavanja: I've explicitly said that Kinds and Types are
orthogonal
18:42 < Halavanja> can you show an example with my example.  I feel that it
would clear things up a bit
18:43 < niemeyer_> Halavanja: reflect.TypeOf(1) is _NOT_ reflect.Int
18:43 < niemeyer_> Halavanja: println(reflect.TypeOf(1) ==
reflect.TypeOf(1))
18:43 < niemeyer_> Halavanja: This is an example
18:44 < niemeyer_> Halavanja: You can do that with any value
18:44 < niemeyer_> Halavanja: println(reflect.ValueOf(1).Type() ==
reflect.TypeOf(1))
18:44 < niemeyer_> Halavanja: Same thing
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18:47 < Halavanja> I understand that it works like that.  So what you are
saying is anytime that I want to use this with other types such as structs I have
declare that struct in my function or have it global just so that I can do this
check?
18:48 < nicka> that is my understanding of the situation
18:48 < Halavanja> because I just ran it like that and it seemed to work
fine, its just in my opinoon there is too much overhead to do that
18:48 < Halavanja> It is a solution and I agree it works
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18:50 < nicka> unless your type is a very large struct the overhead is
allocating a zeroed struct
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18:50 < george_> Hi, Can anyone tell me how to use a mysql in go ? Or is
there any suggestion other than mysql?
18:50 < nicka> well, that's all the overhead even if it's large
18:50 < Halavanja> nicka: true
18:50 < Halavanja> Its just kind of annoying in my opinon lol
18:51 < nicka> I agree it's annoying
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18:51 < nicka> george_: http://go-lang.cat-v.org/pure-go-libs
18:52 < niemeyer_> Halavanja: What's the overhead?
18:52 < niemeyer_> Halavanja: It's a pointer comparison
18:52 < nicka> typing, I think
18:52 < nicka> instead of being able to do typename.Type(), I think?
18:52 < Halavanja> nicka: is right
18:52 < niemeyer_> Halavanja, nicka: What's the difference?
18:53 < Halavanja> pointer comparisions are fine its just annoying that I
have to setthat up everytime i want to do it
18:53 < george_> nicka: Thanks ;)
18:53 < Halavanja> I just see it becoming a source of error because of the
set up
18:53 < niemeyer_> Halavanja: Set what up..  sorry..  not trying to be
difficult, I just don't see the point you're trying to make
18:54 < nicka> He'd like to be able to get a Type for a given type without
having to instantiate a variable of that type
18:54 < nicka> what a confusing sentence.
18:54 < niemeyer_> Well..  sure..  I'd like a pony
18:54 < Halavanja> nicka is right haha
18:55 < Halavanja> And i'm not trying to be difficult at that at all.  I
just thought there was a more formal way to do it is all
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18:55 < Halavanja> such as var.Type()
18:55 < niemeyer_> Halavanja: That's calling the Type() method on your var
18:55 < niemeyer_> Halavanja: reflect.TypeOf(var) is not..
18:55 < niemeyer_> Halavanja: Woohay good design
18:56 < Halavanja> niemeyer: yeah i know.  It was just to empahsize a point
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18:57 < niemeyer_> Halavanja: Sorry, I know.  The point I'm attempting to
confusingly make is that you have what you want, and it's not exactly like you
want because of reasonable points
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18:58 < Halavanja> Yes I see that now.  And I will use it
18:59 < nicka> You could keep a Type in your packages corresponding to your
types, I would think
18:59 < niemeyer_> nicka: Yeah, I've done that before in fast paths
19:00 < niemeyer_> var myType = reflect.TypeOf(MyType{})
19:00 < niemeyer_> as a global
19:00 < niemeyer_> Not worth it outside of a fast path, though..
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19:03 < Halavanja> thats what i was looking for haha.
19:03 < Halavanja> var myType = reflect.TypeOf(MyType{})
19:03 < niemeyer> Halavanja: Superb :)
19:04 < Halavanja> That saves the extra declariation and helps find the
type.  Perfect
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19:11 < gmilleramilar> why does []byte(mystringvar) do an alloc/copy?  and
more importantly how do I write a string to a net.IPConn (or similar) without the
overhead of that alloc/copy?
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19:12 < jessta> gmilleramilar: it has to copy the string, because strings
are immutable and []byte isn't
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19:13 < gmilleramilar> jessta: makes sense.  so the answer to the second
question is "you cant"?
19:13 < jessta> gmilleramilar: the easiest way to avoid the copy is to not
have a string
19:14 < gmilleramilar> yeah, unfortunately I'm getting the string from
something like time.Format() which returns a string.
19:14 < Halavanja> I believe that if you can cast it to a []btye and use
that it may solve your problem.
19:14 < Halavanja> COuld be wrong
19:14 < Halavanja> You can use the buffer package to create a new bytes
buffer
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19:19 < jessta> gmilleramilar: you can't avoid the copy, but you can avoid
the additional allocation if you've already got somewhere to copy it to
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19:20 < sanjoyd> Is the Go calling convention documented somewhere?
19:21 < KirkMcDonald> I don't know that there's a standard Go calling
convention as such.  I mean, don't gc and gccgo use different ones?
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19:22 < gmilleramilar> yes, it's an implementation detail of the
compiler/linker
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19:23 < gmilleramilar> and I don't know for a fact that it's not documented,
but the toolchain is very sparsely commented, and I'd be surprised if it was.
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19:53 < ptrb> Broad question: are channels fast enough to meet realtime
requirements?
19:53 < aiju> yes
19:54 < aiju> really, what's that kind of question?
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19:54 < aiju> could someone define "fast enough to meet realtime
requirements"?
19:54 < ptrb> I'm trying to figure out how to drill down to my use case in a
coherent way...
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19:55 < nicka1> aiju: see definition for systems language
19:55 < ptrb> I've got an audio callback function that expects audio data
every N ms.
19:55 < aiju> nicka1: HAHAHAHA
19:55 < aiju> also cf.  santa claus
19:55 < ptrb> I'm feeding it with a set of channels, but the audio is rather
"skippy", for lack of a better word.
19:55 < aiju> ptrb: garbage collection?
19:55 < ptrb> aiju: Hmm.  Maybe.  What sort of schedule does it run on,
normally?
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19:56 < ptrb> Anyway, I can just disable it, right.
19:56 < aiju> it what wait?
19:56 < aiju> the GC doesn't have schedules
19:56 < ptrb> Isn't it stop-the-world type?
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19:57 < aiju> yes
19:57 < aiju>
http://phicode.de/view-mail.php?show=08164ab8c3a28375b52289731d7da5db%40cirno.Speedport_W_722V_Typ_B
19:57 < aiju> that worked fine for me
19:57 < aiju> and it's realtime, according to your definition
19:58 < ptrb> Yeah, the trivial cases (like that) work fine.  The problem is
when I start multiplexing a lot of channels together.
19:58 < ptrb> Multiplexing + chaining channels, rather.
19:58 < ptrb> And for values of "a lot" which are around ~16 or so.
19:58 < aiju> have you tried buffering?
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19:59 < ptrb> Yeah, but it's a tricky game.  If your chains can be
arbitrarily long, and you want near-realtime response times to input changes, you
can't buffer everything.
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19:59 < aiju> huh?
19:59 < aiju> small buffers are your friend
20:00 < ptrb> Well, buffers sized << sample rate are not so useful,
or?
20:00 < aiju> basically everything is better than three dozens context
switches per sample
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20:01 < ptrb> but goroutines don't necessarily represent context switches,
or?
20:01 < aiju> yes they do
20:01 < aiju> goroutine context switches
20:01 < aiju> they are cheap, but it's relative
20:01 < ptrb> cheaper than threads, yeah.  ok.  I guess you're right.
20:01 < ptrb> guess I gotta rethink the architecture here a bit.
20:02 < aiju> they also run through the scheduler
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20:06 < maht> I've done a cursory search, has anyone written a venti client
library for go ?
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20:08 < f2f> govt
20:09 -!- Stiletto [7f000001@69.195.144.4] has joined #go-nuts
20:09 < f2f> http://code.google.com/p/govt/
20:09 < maht> thanks
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20:19 < Halavanja> Is there a way to cast an interface as the type it
represents and use the data that is inside?  I have created an interface an
basically created a new interface and have that interface returned so I can use it
20:19 < Halavanja> what i want to do is use that retured interface as the
type it represents
20:20 < Halavanja> mind is kind of fried so sorry if this does't make sense
20:20 < ptrb> Halavanja: sounds like you're misusing interfaces.
20:20 < ptrb> if your interface is 1-to-1 with the underlying type, don't
use an interface.
20:20 < Halavanja> its not
20:20 < Halavanja> its a one to many
20:20 < ptrb> and reflect isn't cutting it?
20:20 < Halavanja> its getting passed a type and then a choice is being made
on that type and the new type is returneing it
20:21 < Halavanja> i'm not sure what to call for reflect to cast it
20:21 < pharris> Halavanja:
http://golang.org/doc/go_spec.html#Type_assertions
20:22 < pharris> Or possibly
http://golang.org/doc/go_spec.html#Switch_statements under "Type switches"
20:23 < f2f> Halavanja: what's the error you're getting exactly?
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20:23 < Halavanja> I am actually doing the switching portion in my code
20:23 < Halavanja> no error per say, its more of a usage thing
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20:23 < Halavanja> I want to make that interface a used type instead of an
interface that was returned from a function
20:24 < Halavanja> I'm looking at the type assertation now
20:24 < f2f> do you understand how this works?
20:24 < f2f> x := int(4); func(i interface{}) { println(i.(int))}(x)
20:24 < Halavanja> not 100%
20:24 < Halavanja> that makes sense yes
20:24 < f2f> do you want to return a concrete type from a function like the
above?
20:24 < Halavanja> im doing the inverse actually
20:25 < Halavanja> interface{}(type)
20:25 < Halavanja> so I can use the underlying type in the interface
20:25 < f2f> a type is automatically an interface, so you don't need to cast
to it
20:26 < f2f> for example, no cast is needed for the 'x' above
20:26 < Halavanja> http://pastebin.com/rVgBaSRu
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20:28 < Halavanja> Thats what I'm trying to work with as an example
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20:28 < Halavanja> I'm writing it as a test so that I can try to translate
it to my actual project
20:28 < Halavanja> basically takes in json and unmarshalls it and returns a
full type
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20:29 < f2f> you'd do the cast on line 66 then, when you're using the
variable.
20:29 < Halavanja> I'm sorry that was supposed to go on line 61
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20:32 < f2f> this is the simplest example that does what i think you're
trying to do:
20:32 < f2f> http://pastebin.com/hvg4ejZp
20:32 < f2f> of course you can have type switches inside the function 'f',
even change types on return, then type-switch where the prints are
20:32 < Halavanja> I got it to work I think.  It was the type assertion I
was just being dumb I think
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20:33 < Halavanja> using the . operation made it work fine.  Like I said
brain fried.  haha . Thank you
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20:53 < pyrhho> I'm trying to list the files present in a directory, but
seems like I'm only getting integers back?  not sure what I'm doing wrong..
20:53 < pyrhho> the code I'm using is:
20:53 < pyrhho> dir, err := os.Open("directory")
20:54 < pyrhho> then
20:54 < pyrhho> dir.Readdir(-1)
20:54 < pyrhho> but it just returns [0,1,2,3,4,5,etc...]
20:54 < pyrhho> (have also tried dir.Readdirnames(-1)
20:55 < uriel> I think the problem is probably in how you are iterating over
the resulting slice
20:55 < f2f> :)
20:56 < pyrhho> for file := range file { fmt.Printf("%v", file) } ??
20:56 < pyrhho> erm (range files, sorry)
20:56 < remy_o> you need for _, file := range files
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20:57 < pyrhho> d'oh
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20:57 < pyrhho> heh.  got it
20:57 < pyrhho> thanks
20:57 < pyrhho> :)
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22:43 < knowmercy> is there a go dev channel?
22:43 < nicka1> go-dev mailinglist
22:44 < knowmercy> ahh ok
22:44 < knowmercy> I'm really anxious to get this code in my local tree
22:44 < knowmercy> i might just take it from the codereview site :)
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23:22 < rcrowley> Hi. Anyone around that can talk about signal handling in
Go?
23:24 < rcrowley> My problem is hopefully simple: I'm unable to handle any
signals delivered via kill(1) with sig := <-signal.Incoming in my main
goroutine.  Interactively delivering SIGINT with ^C works as expected.
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23:33 < rcrowley> Correction: I'm trying to use <-signal.Incoming twice
in (relatively) rapid succession to await SIGUSR2 followed by SIGQUIT and the
second blocking read on the channel is what panics.
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23:48 < knowmercy> that Stiletto join/part is really annoying
23:48 < cbeck> What does the panic say?
23:48 < cbeck> rcrowley: ^^
23:49 < rcrowley> cbeck: Not very much, unfortunately.
http://pastie.org/2383242
23:49 < nicka1> if adg isn't around, a freenode admin might deal with
Stiletto
23:50 < rcrowley> cbeck: It's more and more clear that a second call to
<-signal.Incoming is what causes it to explode.
23:51 < cbeck> rcrowley: Does it still explode if you don't send the second
signal?
23:52 < rcrowley> cbeck: No it does not.  The panic also does not occur when
the syscall.ForkExec in between the two <-signal.Incoming does not happen.
23:52 < cbeck> code snippet?
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23:54 < rcrowley> cbeck: http://pastie.org/2383258
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23:55 < rcrowley> cbeck: Commenting just the syscall.ForkExec (and cleaning
up therefore unused variables) prevents the panic.
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--- Log closed Wed Aug 17 00:00:20 2011