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Gambit C Interface (FFI)
by Guillaume Cartier 17 Sep '07

17 Sep '07

Help needed! I am trying to understand Gambit's C interface and I have this very simple code that crashes and have no clue why. Anyone has any idea? (Gambit 4.0.0) With this function defined in my gambcini : (define (C . rest) (let loop ((n (if (null? rest) 1 (car rest)))) (if (> n 0) (begin (write n) (newline) (compile-file "c") (load "c") (make-S2) (loop (- n 1)))))) I run (C 50) maybe a couple times and always end up getting a random crash often the first time File c.scm : (c-declare "struct S2_ { int x; int y; }; typedef struct S2_ S2;" ) (c-define-type S2 (type "S2")) (define make-S2 (c-lambda () S2 "___result_voidstar = calloc(1, sizeof(S2));"))

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Emailing changes automatically
by Marc Feeley 13 Sep '07

13 Sep '07

I would like to automatically send to the Gambit mailing list all the changes that are made to the Gambit repository. I tried following the instructions in: http://morecode.wordpress.com/2007/08/03/setting-up-mercurial-to-e- mail-on-a-commit/ but that doesn't seem to work. Does anyone here have experience with doing that? The .hg/hgrc file I'm using is attached below. Marc [paths] default-push = ssh://gambit@trex.iro.umontreal.ca/HTML/repo/gambit default = http://www.iro.umontreal.ca/~gambit/repo/gambit/ [extensions] hgext.notify = [hooks] # batch emails when many changesets incoming at one time changegroup.notify = python:hgext.notify.hook [smtp] host = localhost [email] from = gambit(a)iro.umontreal.ca [web] baseurl = http://www.iro.umontreal.ca/~gambit/repo/gambit/ [notify] # config items go in here config = /part/02/www-perso/usagers/gambit/HTML/repo/notify.conf maxdiff = 0 # max lines of diffs to include (0=none, -1=all) maxsubject = 67 # truncate subject line longer than this diffstat = False # add a diffstat before the diff content sources = serve push pull bundle # notify if source of incoming changes in this\ list # you can override the changeset template here, if you want. # If it doesn't start with \n it may confuse the email parser. # here's an example that makes the changeset template look more like hg log: template = \ndetails: {baseurl}{webroot}/rev/{node|short} \nchangeset: {rev}:{\node|short}\nuser: {author}\ndate: {date|date}\ndescription:\n{desc}\\n Note that the file /part/02/www-perso/usagers/gambit/HTML/repo/ notify.conf contains: [reposubs] # key is glob pattern, value is ","-separated list of subscriber emails * = feeley(a)iro.umontreal.ca # [usersubs] # # key is subscriber email, value is ","-separated list of glob patterns # user@host = pattern # # [reposubs] # # key is glob pattern, value is ","-separated list of subscriber emails # pattern = user@host

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'const' types with ffi
by David St-Hilaire 12 Sep '07

12 Sep '07

Hi all! How can I represent a 'const int' type within gambit's ffi? Lets say I have the C funciton: const int adder(int n){ blablabla...} and I want to interface that function with a c-lambda, how can I do that? If I try to omit the 'const' for the parameter's type, I get an error (bad type convertion) when compiling with g++ ("invalid conversion from ‘const void*’ to ‘void*'")... I haven't seen anything talking about 'const' types in the ffi documentation... By the way, I'd like to thank you all for always answering and answering quickily to all my (and others) questions! It really helps and motivates me to program in scheme! ^_^ David

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C macro ffi?
by David St-Hilaire 12 Sep '07

12 Sep '07

Hi again! Is there a way to interface some C defined macros? I tried with c-lambda and was unsucessfull... Thanks! David

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[ANN] Gambit-C v4.0.1 released
by gambit＠iro.umontreal.ca 12 Sep '07

12 Sep '07

Gambit-C v4.0.1 is now available. The sources and prebuilt distributions can be obtained from the Gambit web site by visiting one of the following links. sources: http://www.iro.umontreal.ca/~gambit/download/gambit/v4.0/source/gambc-v4_0_… prebuilt: http://www.iro.umontreal.ca/~gambit/download/gambit/v4.0/prebuilt/gambc-v4_… http://www.iro.umontreal.ca/~gambit/download/gambit/v4.0/prebuilt/gambc-v4_… http://www.iro.umontreal.ca/~gambit/download/gambit/v4.0/prebuilt/gambc-v4_… http://www.iro.umontreal.ca/~gambit/download/gambit/v4.0/prebuilt/gambc-v4_… http://www.iro.umontreal.ca/~gambit/download/gambit/v4.0/prebuilt/gambc-v4_…

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Screensaver .gif
by Bradley Lucier 12 Sep '07

12 Sep '07

Just for fun, I made this the only image in my screensaver folder on my mac at work. I unclicked "crop slides to fit on screen" under screensaver options to get the effect I wanted. This is an old PLT logo, previously converted by me to svg in inkscape, and now converted to GIF at a fairly high resolution (.svg - > .eps (by inkscape) -> .gif (by Preview)). Robby Findler has a whole progression of PLT logos on his web site at http://people.cs.uchicago.edu/~robby/logos/ This particular logo seems to have been disavowed by the PLT group in an attempt to go mainstream (good luck with that!), so I don't feel so bad using it as a logo for Scheme itself. So Steve Jobs like to fly the skull-and-crossbones; we can turn a dead-head into a lambda-head! Brad

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how to load snow package in gsi
by Quân Ta 12 Sep '07

12 Sep '07

Hi, It's probably something simple, but I just couldn't figure out. How can I load snow package into gambit interactive repl? Thanks, Quan

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Random random-integer?
by David St-Hilaire 11 Sep '07

11 Sep '07

Hi! I'm using the random-integer function, but it would seem that it always give the same set of results after each execution... I then guessed I had to set the random seed, somehow but I couldn't figure out the way to do it... I tried something like: (set! default-random-source (make-random-source)) (random-source-randomize! default-random-source) (pp (random-integer 10)) (pp (random-integer 10)) (pp (random-integer 10)) And tried to run it multiple times and I still get the same answer each time I run this simple program... :( What should be done to make this random? Shouldn't be that the default-random-source produce different random integers at each program launch?? Thanks! David

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The Stochastic Pi-Machine
by Bradley Lucier 11 Sep '07

11 Sep '07

I'm wondering if Termite might have some connection with the Stochastic Pi-Machine, possibly as an implementation model. https://research.microsoft.com/~aphillip/spim/

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homepage not reachable ?
by Jerry van Dijk 10 Sep '07

10 Sep '07

Hi everyone, I am sorry that my first message to this list is not directly Gambit related, but I have been unable to reach the the homepage. Others report they can access the page OK, maybe someone on the list can check if there is a problem with e.g. my provider ? Thanks in advance and once again apologies for imposing this subject here. gr. Jerry. -- -- Jerry van Dijk -- Leiden, Holland -- -- The early bird may get the worm, but the second mouse gets the cheese!!

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