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RE: Web server code in Haskell by Simon Marlow?
by Bayley, Alistair 20 Mar '03

20 Mar '03

This was mentioned earlier this month, see: http://haskell.org/pipermail/haskell/2003-March/011372.html http://haskell.org/pipermail/haskell/2003-March/011371.html -----Original Message----- From: Ahn Ki-yung [mailto:kyagrd@hitel.net] Sent: 20 March 2003 07:29 To: haskell(a)haskell.org Subject: Web server code in Haskell by Simon Marlow? *** WARNING - this email originates from the Internet *** I am very interested in writing server programs in haskell. There is a link to a paper and code of haskell web server in the following page. http://www.haskell.org/practice.html I can see the case study paper, but there is no code at the link location. I think inspecting through code might be very helpful, even if it does not compiling in the recent version of GHC. Please notice me where I can see the code if it is available. Also I hope the link at the haskell hompage be updated as well :-) Thanks. -- Ahn Ki-yung _______________________________________________ Haskell mailing list Haskell(a)haskell.org http://www.haskell.org/mailman/listinfo/haskell *********************************************************************** INVESCO UK can accept no responsibility for the nature of this e-mail. If you have grounds to suspect that it is offensive or non-business related it should be deleted immediately. If you require an incoming Internet e-mail to be checked for content on your behalf please forward to the designated business mail parking area. If you wish to report the receipt of an offensive e-mail contact the IT Security section within London or Henley. It is an INVESCO UK policy that all Information Systems must be used for business related purposes. In order to protect the company's image and all personnel INVESCO UK Information Systems will be subject to monitoring. Disciplinary action will be taken against anyone who stores, distributes or displays inappropriate material. *********************************************************************** ***************************************************************** The information in this email and in any attachments is confidential and intended solely for the attention and use of the named addressee(s). This information may be subject to legal professional or other privilege or may otherwise be protected by work product immunity or other legal rules. It must not be disclosed to any person without our authority. If you are not the intended recipient, or a person responsible for delivering it to the intended recipient, you are not authorised to and must not disclose, copy, distribute, or retain this message or any part of it. *****************************************************************

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RE: Web server code in Haskell by Simon Marlow?
by Simon Marlow 20 Mar '03

20 Mar '03

> I am very interested in writing server programs in haskell. > > There is a link to a paper and code of haskell web server > in the following page. > > http://www.haskell.org/practice.html > > I can see the case study paper, but there is no code at > the link location. I think inspecting through code might be > very helpful, even if it does not compiling in the recent > version of GHC. The link is out of date. The code is now in the CVS repository, and it has a proper license. You can browse it on the web, here: http://cvs.haskell.org/cgi-bin/cvsweb.cgi/fptools/hws/ Cheers, Simon

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RE: flock and sockets
by Simon Marlow 20 Mar '03

20 Mar '03

> I am planning a Haskell project and I need to access files. Since the > program will be automatically started whenever a mail comes > in I will need > to be able to lock the access to files. Is there any support > for this in some library? Yes, the Posix library distributed with GHC has support for file locking. See http://www.haskell.org/ghc/docs/latest/html/hslibs/sec-posix.html This library is currently undergoing a rewrite - the functionality will be available under System.Posix in future releases of GHC (and possibly Hugs & NHC). > The second option that I have is to use a daemon and let the > programs that > get started by mail connect via some sort of socket. Is there > any socket support in Haskell? Yes: http://www.haskell.org/ghc/docs/latest/html/network/index.html (currently only available with GHC). Cheers, Simon

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Web server code in Haskell by Simon Marlow?
by Ahn Ki-yung 20 Mar '03

20 Mar '03

I am very interested in writing server programs in haskell. There is a link to a paper and code of haskell web server in the following page. http://www.haskell.org/practice.html I can see the case study paper, but there is no code at the link location. I think inspecting through code might be very helpful, even if it does not compiling in the recent version of GHC. Please notice me where I can see the code if it is available. Also I hope the link at the haskell hompage be updated as well :-) Thanks. -- Ahn Ki-yung

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History of Haskell, first draft
by Steffen Mazanek 19 Mar '03

19 Mar '03

Hello, a first draft of my little Haskell-history collection is online now: http://pseiko.gmxhome.de/pseiko/Haskell-History.html Please note, that one part is still just copied from http://www.idt.mdh.se/kurser/cd5100/ht02/history.html but I hope it will evolve quickly. Moreover some parts are still missing. So please understand it as a framework and base where all kinds of additional contributions are pluggable. A big thank you to all helpers. Ciao, Steffen

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RE: recursive modules in Haskell
by Simon Peyton-Jones 19 Mar '03

19 Mar '03

| i am curious however, what is difficult about implementing recursive | modules (that is, if it can be explained without getting into the | technical details of GHC). Nothing deep. GHC is just a fairly big thing and one of its assumptions is that it is compiling one module at a time. There'd be quite a bit of chuffing around to remove this assumption. Nothing fundamental, but real work. Simon

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RE: recursive modules in Haskell
by Simon Peyton-Jones 19 Mar '03

19 Mar '03

| there is no need to use such hacks. it is not dificult to add suport | for mutually recursive modules to an implementation directly. | unfortunatley none of the working haskell implementations support | recursive modules, Simple in principle, not so simple in practice. If it was easy to make GHC do mutually recursive modules we'd do it right away. It's certainly possible but it's real work, and .hi-boot files, while clunky, do the job. S

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flock and sockets
by Daniel Luna 19 Mar '03

19 Mar '03

I am planning a Haskell project and I need to access files. Since the program will be automatically started whenever a mail comes in I will need to be able to lock the access to files. Is there any support for this in some library? The second option that I have is to use a daemon and let the programs that get started by mail connect via some sort of socket. Is there any socket support in Haskell? #Luna -- Daniel Luna | Top reasons that I have a beard: luna(a)update.uu.se | a) Laziness. http://www.update.uu.se/~luna/ | b) I can. Don't look at my homepage (it stinks).| c) I can get away with it.

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data vs. newtype, abstractly
by Dean Herington 19 Mar '03

19 Mar '03

If a type that could be defined either by `data` or `newtype` (i.e., a single-constructor type) is exported abstractly (without its constructor), can the user of the type tell how the type was declared? Dean

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Context not part of a function definition?
by Graham Klyne 18 Mar '03

18 Mar '03

I'm trying to use the following idiom to selectively import functions from the List module: import qualified List nub = List.nub but I'm finding that HUGS complains about "unresolved top level overloading" with "outstanding context: "Eq b". If I duplicate the type signature thus: import qualified List nub :: Eq a => [a] -> [a] nub = List.nub All seems to be well. I find it counter-intuitive that I cannot simply define a = b such that any occurrence of a is equivalent to an occurrence of b. I thought that was the point of referential transparency in functional languages. I don't know where to look in the Haskell documents to decide whether the above is a bug or truly according to the language spec. #g ------------------- Graham Klyne <GK(a)NineByNine.org> PGP: 0FAA 69FF C083 000B A2E9 A131 01B9 1C7A DBCA CB5E

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