Gambit-list Janvier 2009

gambit-list@iro.umontreal.ca

27 participants
31 discussions

C Embedding question
by Alex Ryu 29 Jan '09

29 Jan '09

Hello I would like to do something similar to the following within my C program: ***************** char* condition = "(2 < 4) & (3 > 7"); int boole; ... boole = evaluate(condition); ***************** where evaluate is a scheme function already written and compiled by gsc. Most of the documentation I have seen relates more to the reversed situation - calling C functions from scheme. I have taken a look at the client example program in the tests directory, but it is not clear to me exactly how the string is treated by scheme - ie, in what form it is going to be, if that makes any sense. Obviously I would prefer it as a list of some sort, but I don't know if that's possible. I am using Linux and gcc 4, if that makes a difference. Thanks for your time Alex

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CfP: Scheme Workshop 2009
by John Clements 29 Jan '09

29 Jan '09

*********************************************** SCHEME AND FUNCTIONAL PROGRAMMING WORKSHOP 2009 Cambridge, Massachusetts August 22, 2009 CALL FOR PAPERS http://www.schemeworkshop.org/2009/ *********************************************** The Scheme and Functional Programming Workshop showcases research and experience related to Scheme, and more broadly to all aspects of functional programming. Areas of interest include: * Language Design, Type Systems, Theory * Program Development Environments, Education * Agile Methodologies, Lightweight Software Engineering * Applications, Implementation, and Experience * SRFIs! In addition to technical papers on matters of programming-language research, we encourage submissions that present experience or innovation with a particular project. The key criterion for any paper--technical or not--is that it makes a contribution from which other practitioners can benefit. ** Dates: ** Dates are firm, and will not be extended. Please plan accordingly. Submission Deadline: June 5, 2009 (FIRM) Author Notification: June 26, 2009 Final Papers Due: July 24, 2009 Workshop: August 22, 2009 ** Program Committee: ** John Clements, Cal Poly State University (organizer & chair) Dominique Boucher, Nu Echo Abdulaziz Ghuloum, Indiana University David Herman, Northeastern University Shriram Krishnamurthi, Brown University Matthew Might, University of Utah David Van Horn, Northeastern University ** Publication Policy: ** Submitted papers must have content that has not previously been published in other conferences or refereed venues, and simultaneous submission to other conferences or refereed venues is unacceptable. Publication of a paper at this workshop is not intended to replace conference or journal publication, and does not preclude re-publication of a more complete or finished version of the paper at some later conference or in a journal. ** Submission Instructions: ** Your submissions should be no longer than 12 pages, including bibliography and appendices. Papers may be shorter than this limit, and the Program Committee encourages authors to submit shorter papers where appropriate. The conference web page (URL above) contains detailed formatting instructions and LaTeX support files. Submit your papers using the Continue 2.0 submission server, at the URL: http://continue2.cs.brown.edu/scheme2009/ We look forward to reading your papers!

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Problem in thread-sleep! may be a poor implementation of the select system call
by Marc Feeley 28 Jan '09

28 Jan '09

David St-Hilaire was experimenting with the following program: (define n 0) (thread-start! (make-thread (lambda () (let loop () (set! n (+ n 1)) (thread-sleep! .0001) (loop))))) (thread-sleep! 1) (pp n) ;; expected value of n is approximately 10000 The value printed for n on his Linux computer is approximately 100. When I try the program on my Mac OS X computer I get a value much closer to the expected 10000. After digging around it seems that the resolution of the "timeout" parameter to the "select" system call (which is used by the scheduler to wait for I/O and/or a timeout) can vary greatly from one OS to another. I'm curious to know how well other operating systems handle the timeout. So, if you have access to some unusual operating system, could you try the above program and report back what value is printed? I also wrote the C program below to test the resolution of select's timeout. You can try that too. Marc

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Re: [gambit-list] Problem in thread-sleep! may be a poor implementation of the select system call
by vasil 28 Jan '09

28 Jan '09

David St-Hilaire wrote: > I'm using the gentoo kernel 2.6.28-gentoo-r1. Vasil, what kernel did you used? My kernel is linux 2.6.22-16-rt in AMD64 mode. $ uname -a Linux cassiopea 2.6.22-16-rt #1 SMP PREEMPT RT Mon Nov 24 19:03:10 GMT 2008 x86_64 GNU/Linux This kernel is one of the standard prebuild kernels in Ubuntu 7.10 distributive. Suffix "rt" in kernel name means Real Time, i.e. kernel was build with real-time patch applied. It seems that this kernel is very stable on my machines (HP Compaq 6710b laptop is one of them) . But some people complied that real-time kernel was unstable on their machines. Vasil.

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using the gsc repl non-interactively
by Marijn Schouten (hkBst) 28 Jan '09

28 Jan '09

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi lists, for building JazzScheme it is necessary to issue commands at the gscrepl. For packaging up JazzScheme for Gentoo I need some way to do that in a bash script. I'm trying to get the quit command of JazzScheme's build system to work for now. These don't work: gsc <<<"quit" gsc /dev/stdin <<<"quit" gsc -e '(load "kernel/build") quit' Any ideas? Thanks, Marijn - -- Marijn Schouten (hkBst), Gentoo Lisp project, Gentoo ML <http://www.gentoo.org/proj/en/lisp/>, #gentoo-{lisp,ml} on FreeNode -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkl/x24ACgkQp/VmCx0OL2w94gCgnSamg75D9QrjtG/Bsb4TgsRa zGYAnjQG5KPONS+2igr/w/xLyJSuraOL =HXyc -----END PGP SIGNATURE-----

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gsi / error handling /debug-repl
by symbolic expression 27 Jan '09

27 Jan '09

If I fire up gsi, I can do: > (+ 1 (+ 2 'a)) *** ERROR IN (console)(a)3.6 -- (Argument 2) NUMBER expected (+ 2 'a) 1> ,(c 3) 4 $ cat test.scm: (eval '(+ 1 (+ 2 'a))) $ gsi test.scm *** ERROR -- (Argument 2) NUMBER expected (+ 2 'a) $ okay ... so gsi dies on me, I look into main.scm (in the gambit source, this repl-debug function looks like what I wnat) $ cat test2.scm cat test2.scm (define (my-eval x) (with-exception-catcher ##repl-debug (lambda () (pp x) (eval x)))) (pp (my-eval '(+ 1 (+ 2 'a)))) $ gsi test2.scm (+ 1 (+ 2 'a)) > ,(c 3) 3 $ I dislike this for two reasons. 1) I miss the error statement of: *** ERROR -- (Argument 2) NUMBER expected and 2) I get 3 instead of 4. How can i correct these two? I suspect this is likely a 2 line fix since the functionality already exists. thanks! -- -- symbolic expression

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debugging macros
by eryiling 27 Jan '09

27 Jan '09

suppose I have: (define-macro (foo ...)) the standard way to 'debug' this is to do: (pp (lambda () (foo ...))) however, this requires that (foo ...) expands to proper scheme code (i.e. not things like "(a b . c)"), and also code that has well defined semantic meaning (i.e. no undefined vars) as i write macros, i find that most of the time (in fact, except for the starting point and the ending point), my macro expansion offten results in non-scheme code; is there a way i can see this output? i.e. I wnat to see: (macroexpand '(foo ...)) rather than the particular error for why (foo ... ) does not expand to legit scheme code thanks!

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dealing with \
by symbolic expression 25 Jan '09

25 Jan '09

is there any option I can pass to gsi so that the following code will work? > (pp '(\ 1 2 3)) *** ERROR IN (console)(a)1.11 -- Invalid infix syntax > 3 > *** ERROR IN (console)(a)1.14 -- Datum or EOF expected > *** ERROR IN (console)(a)1.15 -- Datum or EOF expected thanks! -- -- symbolic expression

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macro/function interaction
by symbolic expression 25 Jan '09

25 Jan '09

(define (foo x) (+ x 1)) (define-macro (bar x) (foo x)) (bar 10) this baffles me, if I open up gsi and paste this into the interpreter, I get 11 however, if I stuff this in test.scm and run "gsi test.scm" I get: *** ERROR IN #<procedure #2>, "test.scm"@2.24 -- Unbound variable: foo what's going on? how do I fix this? [I would prefer that code in "gsi test.scm" has the same effect as if I type it into the interpreter] thanks in advance! -- -- symbolic expression

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Google Summer of Code 2009
by Arthur Smyles 25 Jan '09

25 Jan '09

Now is the time to start thinking of joining the Google Summer of Code this year. 1. Should we join as a Summer of Code Mentoring Organization? 2. Which of us would like to participate as Mentors? One of the requirements is to create a Summer of Code Idea's page. I've started one. http://dynamo.iro.umontreal.ca/~gambit/wiki/index.php/Summer_Of_Code_2009 Lets see what ideas we can come up with. Also, you should include whether you would be willing to mentor the ideas that you list. Last year's rules for joining. http://code.google.com/opensource/gsoc/2008/faqs.html Arthur

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Gambit-list Janvier 2009