2009/1/9 Timothy Goddard t...@goddard.net.nz:
On Thu, 08 Jan 2009 21:28:27 minh thu wrote:
Hi,
I'd like to process some kind of graph data structure,
say something like
data DS = A [DS] | B DS DS | C.
Graphs in funtional languages aren't usually represented in this sort of
manner. Trees
John Goerzen jgoerzen at complete.org writes:
Any idea how I get Haskell to send ICMP ECHO packets? (And, obviously,
receive the replies.)
SocketType claims to support Raw, which I think is the conventional
means for doing this. Whether all the infrastructure for that is there,
I don't
On 9 Jan 2009, at 03:51, Niklas Broberg wrote:
- Support for Unicode symbols for e.g. -. Fixing that would require
me to have a Unicode-compliant editor, which it appears I don't. And I
couldn't have someone else submit a patch either, since then I
couldn't open the file anymore in my editor.
Manlio Perillo wrote:
Hi.
I have noted that recent versions of the GHC libraries documentation, no
longer have links to the source code.
What is the reason?
I find it very useful.
This was an oversight in the GHC 6.10.1 release, we'll make sure it gets
remedied for 6.10.2.
Cheers,
John == John Goerzen jgoer...@complete.org writes:
Hello John,
John I would say that database interactions are typically limited to a
John small part of code. In small programs, I generally have a DB
John module that does the queries, and marshals everything to/from the
John rich Haskell types
Bulat Ziganshin wrote:
Monday, December 22, 2008, 11:07:32 PM, you wrote:
The threaded RT creates an OS thread for each CPU/core on the system and
uses them to multiplex userland threads. These are context switched
whenever they block/yield/gc and no priorities can be assigned.
not
Neal Alexander wrote:
Bulat Ziganshin wrote:
Hello Neal,
Monday, December 22, 2008, 11:07:32 PM, you wrote:
The threaded RT creates an OS thread for each CPU/core on the system and
uses them to multiplex userland threads. These are context switched
whenever they block/yield/gc and no
Neal Alexander wrote:
Thomas DuBuisson wrote:
It seems like we could get some priority based scheduling (and still
be slackers) if we allow marked green threads to be strictly
associated with a specific OS thread (forkChildIO?).
I think you want the GHC-only GHC.Conc.forkOnIO
Hi,
A few days ago we published an article (http://gamr7.com/blog/?p=66) on
using the FFI to marshal recursive data structures between Haskell and C
(or Python if you use ctypes).
Best regards,
Ron de Bruijn
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On 2009-01-09 00:51, Niklas Broberg wrote:
- Support for Unicode symbols for e.g. -. Fixing that would require
me to have a Unicode-compliant editor
Can't you just use character literals like '\x2192'?
--
/NAD
This message has been checked for viruses but the contents of an attachment
may
John Goerzen ha scritto:
On Thu, Jan 08, 2009 at 09:46:36PM +0100, Manlio Perillo wrote:
I'm speaking about servers, not clients.
How much of pure Haskell internet servers are used in a production
environment, in the open internet (and not in restricted LANs)?
Does that really matter? I
Bryan O'Sullivan ha scritto:
On Thu, Jan 8, 2009 at 1:07 PM, Manlio Perillo manlio_peri...@libero.it
mailto:manlio_peri...@libero.it wrote:
Another example is the multipart parser:
-- | Read a multi-part message from a 'Handle'.
-- Fails on parse errors.
hGetMultipartBody
benchpress also uses System.CPUTime -- is
that what you are looking for?
I'm writing a program that will read medical signs
from many patients. It's important to have a precise
measure of the time interval between some signs, and
that can't depend on adjustments of time. (Supose
my software is
Andrea Vezzosi wrote:
On Thu, Jan 8, 2009 at 5:25 AM, wren ng thornton w...@freegeek.org wrote:
The question for y'all is what should I call it? I've been calling the
template-function qaf (for Compiled Applicative Form ;) and the type class with
that function would be the only thing in the
Hello Mauricio,
Friday, January 9, 2009, 4:01:18 PM, you wrote:
computer has been turned on would do all I need. Or,
maybe, how much has elapsed since the program started.
i think you should look into system counters (if you on windows). for
example, task managet in vista shows time since
Don't know if it might help but:
http://en.wikipedia.org/wiki/RDTSC
cabal install rdtsc
http://hackage.haskell.org/packages/archive/rdtsc/1.1.1/doc/html/System-CPUTime-Rdtsc.html
Regards,
CS
2009/1/9 Bulat Ziganshin bulat.zigans...@gmail.com
Hello Mauricio,
Friday, January 9, 2009, 4:01:18
Hello Cetin,
Friday, January 9, 2009, 4:29:04 PM, you wrote:
yes, i mean this lib but forget its name :) thank you
Don't know if it might help but:
http://en.wikipedia.org/wiki/RDTSC
cabal install rdtsc
On Fri, Jan 09, 2009 at 01:06:44PM +0100, Manlio Perillo wrote:
John Goerzen ha scritto:
On Thu, Jan 08, 2009 at 09:46:36PM +0100, Manlio Perillo wrote:
I'm speaking about servers, not clients.
How much of pure Haskell internet servers are used in a production
environment, in the open
Henning Thielemann wrote:
wren ng thornton schrieb:
Every now and then I find myself in the position where I'd like to
define some hairy value as a CAF instead of a literal, but I'd like for
it to be fully evaluated at compile-time rather than postponed until
runtime. It'd be possible to
Mauricio ha scritto:
benchpress also uses System.CPUTime -- is
that what you are looking for?
I'm writing a program that will read medical signs
from many patients. It's important to have a precise
measure of the time interval between some signs, and
that can't depend on adjustments of time.
wren ng thornton wrote:
Andrea Vezzosi wrote:
On Thu, Jan 8, 2009 at 5:25 AM, wren ng thornton w...@freegeek.org
wrote:
The question for y'all is what should I call it? I've been calling
the template-function qaf (for Compiled Applicative Form ;) and the
type class with that function would be
Cetin Sert ha scritto:
Don't know if it might help but:
http://en.wikipedia.org/wiki/RDTSC
cabal install rdtsc
http://hackage.haskell.org/packages/archive/rdtsc/1.1.1/doc/html/System-CPUTime-Rdtsc.html
Note that the use of RDTSC register has some issues on multicore CPU.
More info at:
Both wikipedia and hackage rdtsc packages have lot of
warnings regarding things I'm not able to control. It
seems it doesn't work with many platforms, be it older
or multi-core, hibernating computers.
yes, i mean this lib but forget its name :) thank you
Don't know if it might help but:
Hi.
I'm testing the posix-realtime package, but I have found a problem.
Configuration, build and install works well, but if I execute some code
from ghci I get:
GHCi runtime linker: fatal error: I found a duplicate definition for symbol
__hsunix_wifexited
whilst processing object file
On Thu, Jan 08, 2009 at 10:36:32AM -0700, John A. De Goes wrote:
The number of applications requiring the implementation of a custom
web
server is an insignificant fraction of the number of applications
requiring a messaging system. I don't think anyone would dispute
Haskell's ability to do
You must be referring to erlang-0.1, an alpha release of a package
that impersonates an Erlang node.
Which is surely useful to someone, somewhere, but is not useful to
write a messaging application.
Regards,
John
On Jan 8, 2009, at 4:17 PM, Bryan O'Sullivan wrote:
On Thu, Jan 8, 2009
My statements refer not to the FFI, but as I said, to FFI code. FFI-
based libraries seldom compile without excessive amounts of work,
they're often poorly documented, and in general they seem to be
maintained much less than pure Haskell libraries. The FFI is
necessary, of course, but in
On Jan 8, 2009, at 4:34 PM, Bryan O'Sullivan wrote:
I actually think that we're very close to being in fantastic shape
here.
I think that's Haskell zeal speaking. :-)
Not that I don't appreciate your zeal (I do), and I'm definitely
excited about the stuff you're working on, but we're a
On Fri, 09 Jan 2009 11:01:18 -0200, you wrote:
I'm writing a program that will read medical signs
from many patients. It's important to have a precise
measure of the time interval between some signs, and
that can't depend on adjustments of time. (Supose
my software is running midnight at the end
John A. De Goes wrote:
My statements refer not to the FFI, but as I said, to FFI code.
FFI-based libraries seldom compile without excessive amounts of work,
they're often poorly documented, and in general they seem to be
Examples?
I maintain a couple of FFI libraries, and strive to have
Steve Schafer wrote:
On Fri, 09 Jan 2009 11:01:18 -0200, you wrote:
I'm writing a program that will read medical signs
from many patients. It's important to have a precise
measure of the time interval between some signs, and
that can't depend on adjustments of time. (Supose
my software is
Gour wrote:
John HDBC is a low-level abstraction, which can be used on its own or,
John of course, as a layer underlying HaskellDB or some such. I do not
John dispute the use of tools such as HaskellDB or others that try to
John automate the business of representing a database's schema -- and
John A. De Goes said:
If you're looking for a project to take on, I would suggest starting with
[AMQP]
See:
http://www.reddit.com/r/haskell_proposals/comments/7ihpt/amqp_client/
This isn't a new proposal, not to imply you thought so. If you have a
need for such a library please start working
John Goerzen ha scritto:
Steve Schafer wrote:
On Fri, 09 Jan 2009 11:01:18 -0200, you wrote:
I'm writing a program that will read medical signs
from many patients. It's important to have a precise
measure of the time interval between some signs, and
that can't depend on adjustments of time.
Here's a basic draft project for clock_gettime(CLOCK_MONOTONIC, ...)
http://sert.homedns.org/hs/mnsec/
http://sert.homedns.org/hs/mnsec/dist/mnsec-1.0.0.tar.gz
It could be extended to cover other clock types than just monotonic.
Regards,
CS
2009/1/9 John Goerzen jgoer...@complete.org
Steve
Hi,
Am Donnerstag, den 08.01.2009, 22:22 +0100 schrieb Henning Thielemann:
On 8 Jan 2009, at 23:59, Henning Thielemann wrote:
From Report:
A nice. I jumped into 4.3 and found
§ § R 32 ©
¦ 6
© ¦ 32 ¢ R
2009/1/9 John A. De Goes j...@n-brain.net:
If you're looking for a project to take on, I would suggest starting with
the following:
A high-level, type-safe AMQP client written in 100% Haskell, which provides
a clean way of handling hundreds of unique message types.
Then it would be
The main addition of this versión is the capablity to safely
handle transact, and serialize to permanent storage many datatypes
simultaneously in the same piece of code and incrementally.
Just register each new datatype (with registerType :: Type). So it is not
necessary to glue all types in
Folks,
I'd like to announce a preview-release of the X Haskell Bindings. The
goal of the library is to provide low-level access to the X11
protocol, in the spirit of the X C Bindings This is a preview
because I expect that the interface will still need to change - but I
do plan on bump the
Thanks all for the suggestions!
VIM and I have never gone together well, probably mostly my fault I
know. Maybe some day... Emacs isn't my favorite either. I do have
Notepad++, but it only seems to support a small portion of the unicode
I need. Normally I use TextPad, but it wouldn't show me any
On Fri, 2009-01-09 at 18:38 +0100, Niklas Broberg wrote:
Thanks all for the suggestions!
VIM and I have never gone together well, probably mostly my fault I
know. Maybe some day... Emacs isn't my favorite either. I do have
Notepad++, but it only seems to support a small portion of the
Thomas DuBuisson wrote:
Not all the data structures you need are there last I looked.
This was my conclusion as well.
As with most network libraries I've seen, TCP works just great, and
anything else... tough? (I couldn't even see UDP last time. Have I
missed something?)
As you
could
Dominic Steinitz wrote:
John Goerzen jgoerzen at complete.org writes:
Any idea how I get Haskell to send ICMP ECHO packets? (And, obviously,
receive the replies.)
SocketType claims to support Raw, which I think is the conventional
means for doing this. Whether all the infrastructure
I've managed to get UDP NAT traversal working in my personal project. I
haven't really had issues with the Networking libraries at all (except that
htons and htonl aren't where i expected them to be... and yes, i did
actually need them...)
/jve
On Fri, Jan 9, 2009 at 1:18 PM, Andrew Coppin
marlowsd:
Neal Alexander wrote:
Thomas DuBuisson wrote:
It seems like we could get some priority based scheduling (and still
be slackers) if we allow marked green threads to be strictly
associated with a specific OS thread (forkChildIO?).
I think you want the GHC-only
However options in d) do not offer, afaik, type-safety which is emblem of
Haskell language, so I wonder how much this could be the problem for
real-world usage?
I've been doing a lot of low level sqlite3 lately (it's going to
be on a hackage package as soon as I finish my current work). As
long
Hi,
I have a program that seems to run into occasional garbage
collection-related core dumps. The problem typically only occurs after the
program has been running for a while and is consuming a large amount of
memory (5 - 16GB). The large memory consumption is expected because the
program
Linux has High-Resolution Timers (HRTs) that may be appropriate. See
the manpage for clock_gettime(), which defines these HRTs:
[...]
CLOCK_MONOTONIC, in particular, looks suitable. Using it could be a
matter of just a few quick likes in FFI.
I don't know if Windows has similar features.
John A. De Goes wrote:
Hi Austin,
How do you know it's not your experience with FFI code that isn't
biased? As far as I know, there has been no systematic attempt to
document whether pure Haskell or FFI-based libraries are better designed
and better maintained. Which means your statements
Simon Marlow wrote:
Neal Alexander wrote:
Thomas DuBuisson wrote:
It seems like we could get some priority based scheduling (and still
be slackers) if we allow marked green threads to be strictly
associated with a specific OS thread (forkChildIO?).
I think you want the GHC-only
[on hsql]
Still, it would be nice to present some info 'cause web site still shows
1.7 from Dec '05 as the latest release
see http://article.gmane.org/gmane.comp.lang.haskell.libraries/10490
J.W.
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Hi Manlio,
I am the author of this package. Let me think about what you have
said.
Regards, Vasili
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Haskell-Cafe@haskell.org
http://www.haskell.org/mailman/listinfo/haskell-cafe
Report it as a GHC bug to the GHC team, here:
http://hackage.haskell.org/trac/ghc/newticket?type=bug
if you believe it is a bug.
Cheers,
Don
anishmuttreja:
Hi,
I have a program that seems to run into occasional garbage
collection-related core dumps. The problem typically
Thanks, I have reported a bug.I hope the stack trace is useful.
Cheers,
Anish
On Fri, Jan 09, 2009 at 02:21:58PM -0800, Don Stewart wrote:
Report it as a GHC bug to the GHC team, here:
http://hackage.haskell.org/trac/ghc/newticket?type=bug
if you believe it is a bug.
Cheers,
Don
Galchin, Vasili ha scritto:
Hi Manlio,
I am the author of this package. Let me think about what you have
said.
Regards, Vasili
Thanks.
Note that there are no problems if I compile my program, instead of
running it using ghci.
Manlio Perillo
On Sat, Jan 10, 2009 at 5:20 AM, Andrew Coppin
andrewcop...@btinternet.com wrote:
Dominic Steinitz wrote:
John Goerzen jgoerzen at complete.org writes:
Any idea how I get Haskell to send ICMP ECHO packets? (And, obviously,
receive the replies.)
SocketType claims to support Raw, which I
On Sat, 2009-01-10 at 01:40 +0100, Brian B wrote:
Hi Duncan,
This works for me too, many thanks.
Great.
The only change I needed was that the real pg_config outputs a newline
where your fake one didn't:
Ah yes, good point.
Duncan
___
Don't get me wrong -- the socket support is pretty decent, but there are also
some weird idiosyncrasies, for example requiring that the PortNum is
specified in network byte order and lacking a function to convert
host-network byte order (hton).
PortNum is indeed strange, but it does allow yo
Hi,
I¹m hitting a problem trying create shared haskell libs to be linked into a
C program on Mac OS X.
I¹m using the latest download for Leopard from the GHC page:
http://www.haskell.org/ghc/dist/6.10.1/witten/ghc-6.10.1-powerpc-apple-darwi
n.tar.bz2
I can get basic executables working fine
hmm
Vasili
On Fri, Jan 9, 2009 at 5:30 PM, Manlio Perillo manlio_peri...@libero.itwrote:
Galchin, Vasili ha scritto:
Hi Manlio,
I am the author of this package. Let me think about what you have
said.
Regards, Vasili
Thanks.
Note that there are no problems if I compile
On Fri, 09 Jan 2009 09:28:49 -0600, you wrote:
I'm not sure that the original question implied *that* level of need.
I can't imagine being worried about leap seconds yet at the same time
being willing to accept the potential vagaries of any of the built-in
clocks.
Steve Schafer
Fenestra
On 2009 Jan 9, at 20:51, Tim Newsham wrote:
I'm suprised htonl comes up so often. You can unmarshall data
directly from a byte stream to an Int type without caring about the
underlying representation of your Int. Why do people want the htonl
function?
IP address math. (see @ipcalc in
Manlio,
so compiling to native machine code works ok but if using ghci byte-code
interpreter doesn't . can you supply your program please?
Vasili
On Fri, Jan 9, 2009 at 5:30 PM, Manlio Perillo manlio_peri...@libero.itwrote:
Galchin, Vasili ha scritto:
Hi Manlio,
I am the author
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