Gambit-list Novembre 2008

gambit-list@iro.umontreal.ca

22 participants
21 discussions

[ANN] Gambit-C v4.3.1 released
by gambit＠iro.umontreal.ca 26 Nov '08

26 Nov '08

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comet web server
by francesco bracchi 25 Nov '08

25 Nov '08

I've extended some (contributed by me) dumping grounds packages and added some others, the result is a web server, that implements comet, using actor models to abstract push instead of publish/subscribe protocol. I'm experimenting too with functional reactive programming as a elegant solution to describe web user interfaces. the result could be downloaded via git: git clone git://git.berlios.de/futhark francesco bracchi

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Re: [gambit-list] Termite, IO and memory leakage
by Nicholas Walton 25 Nov '08

25 Nov '08

Christian, Many thanks for that. The code is pure R5RS until it hits Termite of course, no #!key or #!rest variables anywhere to be seen. All I/O is done by write, display or newline. I strongly suspect the problem is in Termite since weird things happen eg if I replace the (+ j j) in the example code with (newline)(write ..) I get the problem, but I also get the problem if I replace it with (if #t (+ j j) (begin (newline) (write ...))) Termite seems to pick up the possible I/O and crashes even if I/O is never executed. I therefore suspect a problem in the serialisation of ports but I can't be sure. NIck On Tuesday, November 25, 2008, at 01:48PM, "Christian Jaeger" <christian(a)pflanze.mine.nu> wrote: >Nicholas Walton wrote: >> Any ideas please? >> > >I can't really say anything about the memory leaking (I'm not a regular >Termite user). > >Regarding the segv's/bus errors, run the code under gdb and look at or >show the backtrace, this should give a clue on what's happening. Compile >with cc-options -g and with options keep-c or track-scheme for better >location reporting. > >Just to be sure, check whether you're using |print| or |println| or >defining own functions using both the #!key and #!rest syntax at the >same time, since Gambit has (afaik still) a known problem in the GC when >calling such procedures (it is triggered only when a GC happens in the >right place, so you'll only see it when you're calling such procedures >often). > >People having time to debug (not me currently) might appreciate a >complete example to reproduce the problem. > >Christian. > > >

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Relaxing moment
by Guillaume Cartier 17 Nov '08

17 Nov '08

For a relaxing moment using Gambit, try evaluating the following : (inexact->exact 2.2) ---------- the 2476979795053773/1125899906842624 result shows that Gambit does indeed smoke some powerfull stuff!

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Newbie question about Gambit and iPhone
by Chanwoo Yoo 15 Nov '08

15 Nov '08

Hello. Several days ago, I posted the next message in Google scheme group. "Hello. Nowadays, I'm trying to make ipod touch toy applications. When I write object-c or c code, I can't help miss macro and repl of lisp. As the subject, I hope that I develop core functions with lisp (e.g. In game application, they will be artificial intelligence parts), and make them into c dynamic or static libraries. If cocoa touch application can use shared libraries, object-c will be need in only GUI and controller parts. Is it possible? If it is possible, is there implementation which generate c libraries? I looked around ECL, bigloo, and some other lisps, but I couldn't find how to export symbols of var and function to external C and generate a library rather than make standalone executable. Would you recommend a good implementation(generate small binaries as possible, good documentation...) for it? Regards." And Mark answered me like below, so I tried to find how to build gambit code for iPhone application in Xcode. "Yes, with Gambit. See: https://webmail.iro.umontreal.ca/pipermail/gambit-list/2008-January/0...<https://webmail.iro.umontreal.ca/pipermail/gambit-list/2008-January/001966.…>" I went to the blog (http://weblog.latte.ca/blake/tech/iTouch/languages.html), and try to find how he makes it. But I didn't find any hint. And I read the manual of Gambit and searched in all Gambit list archives for examples of C interoperation. Shamely, because I don't know much about gcc build process and options, I can't figure out how I can apply them into Xcode build process. So I decided to try it in every way. First, I asserted that my mac can generates an executable. bash-3.2$ gsc -c m2.scm bash-3.2$ gsc -c m3.scm bash-3.2$ gsc -link m2.c m3.c bash-3.2$ gcc m1.c m2.c m3.c m3_.c -I/usr/local/Gambit-C/current/include -L/usr/local/Gambit-C/current/lib -lgambc bash-3.2$ ./a.out ((2 . 2) (4 . 4) (8 . 8) (16 . 16)) Next, I tried to compile "tests/server.scm" example in Xcode iPhone application project. Because I didn't know hot it goes, I added all files in "/usr/local/Gambit-C/current/include" and "usr/local/Gambit-C/current/lib" into Xcode project. And I copied generated c files and server.h file except client.c into Xcode project. I tried next combinations. all .a files in usr/local/Gambit-C/current/lib + Gambit.h + generated "server.c" by "gsc -c server.scm" + server.h copied into Xcode project, and "Build and Go" all .a files in usr/local/Gambit-C/current/lib + Gambit.h + generated "server.c", "server_.c" by "gsc -link -flat server.scm" + server.h copied into Xcode project, and "Build and Go" all files in usr/local/Gambit-C/current/lib + Gambit.h + generated "server.c" by "gsc -c server.scm" + server.h copied into Xcode project, and "Build and Go" all files in usr/local/Gambit-C/current/lib + Gambit.h + generated "server.c", "server_.c" by "gsc -link -flat server.scm" + server.h copied into Xcode project, and "Build and Go" All they failed. I know I look stupid. ^_^;; Could I get some help if there is anyone who have built Gambit code in Xcode with c or object-c files? Thanks in advance.

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Profiling of expanded code?
by David St-Hilaire 15 Nov '08

15 Nov '08

Hi all! I often use Guillaume Germain's profiler for gambit (http://www.iro.umontreal.ca/~germaing/statprof.html) and I would like to know if its possible to get a profiling result on the marco expanded code, and not the source code. I ask this because I wrote several macro which define multiple functions. It seems that lots of the work is done within these functions but the profiler only tells me that it is my macro call who does all the work (but its in fact the code generated by that macro). So having access to a profiling report of the macro expanded code could be usefull :) Thanks! David

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Git mirror
by Nguyen Thai Ngoc Duy 09 Nov '08

09 Nov '08

Hi, I created a Git mirror for Gambit-C at http://repo.or.cz/w/gambit-c.git Now you can clone/update it via git native protocol, which is a bit faster than http. Cheers, -- Duy

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iTunes plugin success.. not so much
by Neil Baylis 09 Nov '08

09 Nov '08

Ah well, egg on face and all that. I've uploaded a new version of my iTunes visualizer with Scheme REPL. The version I uploaded previously was accidentally linked against libgambc.dylib and required that to be in the right place to work. This version is correctly linked against libgambc.a and should work even if you don't have Gambit installed. For anyone interested, you can download scmviz.tar.gz<http://www.pixpopuli.com/Downloads/scmviz.tar.gz> If you download it and unpack the archive, you'll find a README file with instructions. Thanks, and sorry for any inconvenience caused by the faulty version. Neil Baylis

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iTunes plugin success
by Neil Baylis 07 Nov '08

07 Nov '08

Thanks to Marc and others who offered advice, I completed my little project to make an iTunes visualizer plugin with a Scheme REPL. I had previously got it working with Tiny Scheme, but wanted a more robust Scheme implementation, with a compiler. For anyone interested, you can download scmviz.tar.gz<http://www.pixpopuli.com/Downloads/scmviz.tar.gz> If you download it and unpack the archive, you'll find a README file with instructions. >>> Note this currently only supports intel Macs running OSX 10.5 or later. <<< You can play music and watch the pretty pictures, or add your own code in scheme to make it work differently. There's a programming guide along with some sample code to get you started. All you need is a text editor. This is my first project embedding Gambit as a library, and I'm very impressed. It went together with no problems at all. I made a few hooks into the Quartz 2D framework for generating the graphics, but it's not by any means a complete interface. Neil Baylis

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various
by Christoph Bauer 05 Nov '08

05 Nov '08

Hello Experts, my favorite feature of gambit is its portability. It compiles so easily on SunOS, IRIX, AIX, HP-UX and Linux. (Try to find such a common lisp implementation!) So now my questions: - is there a way to copy a record (define-structure) or to convert it to a list, like table-copy and table->list? for tables - there is a function to create symbolic links. Is there also one for readlink(2)? - feature wish: copy-file could be extended to overwrite an existing file. copy-file src dest #!optional force - this code, which is written by Olin Shivers, doesn't work: > (define-syntax let-string-start+end (syntax-rules () ((let-string-start+end (start end) proc s-exp args-exp body ...) (receive (start end) (string-parse-final-start+end proc s-exp args-exp) body ...)) ((let-string-start+end (start end rest) proc s-exp args-exp body ...) (receive (rest start end) (string-parse-start+end proc s-exp args-exp) body ...)))) *** ERROR IN (console)(a)4.17 -- Ill-formed expression Christoph Bauer

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Gambit-list Novembre 2008