Gambit-list Avril 2011

gambit-list@iro.umontreal.ca

25 participants
41 discussions

FFI and scheme-object
by Diogo F. S. Ramos 05 Avr '11

05 Avr '11

Hello all, I'm trying to get my way around the FFI interface but I am a little lost. I'm creating a list with scheme and I want to retrieve a piece of it from C, but I'm receiving a segfault. I was looking around the examples from the distribution and I found (##still-copy), which made my code work, but I don't know why, and I couldn't find any mention of it inside the manual. Here is my scheme code (foo.scm): ;;; (c-define (make-book title author) (char-string char-string) scheme-object "make_book" "" (list title author)) (c-define (get-title book) (scheme-object) char-string "get_title" "" (car book)) (c-define (get-author book) (scheme-object) char-string "get_author" "" (cadr book)) ((c-lambda () void "f")) ;;; And here is my C code (bar.c): /**/ #define ___VERSION 406001 #include <gambit.h> void f() { ___SCMOBJ newbook = make_book("foo", "bar"); get_title(newbook); } /**/ I'm compiling with: gsc -o baz -exe bar.c foo.scm -- Diogo F. S. Ramos

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Using Gambit Scheme with Xcode
by John Velman 04 Avr '11

04 Avr '11

I've tinkered with learning scheme off and on for years, but never had enough incentive to stick to it. Now, with Pixie Scheme III, a real programming language implementation, on the iPad, I'm taking another shot at Scheme. My main computer is an iMac running OS X 10.6.7; My Xcode is 3.2.5; I have the iOS development kit, but haven't yet started any apps for iPad/iPhone. Right now I'm working on a couple of OS X cocoa apps (in addition to coming up to speed on Scheme). I'd like to be able to do two things with Scheme, hopefully without a lot of difficulty: 1) Develop OS X applications in Xcode, using C libraries written in Scheme for the Model part of MVC, and Cocoa doing the, with Cocoa doing the View-Controller stuff. Are there any good examples or tutorials available for generating, with Gambit Scheme, C-Library routines that can be copied into an Xcode project and then used with minimum modification to the Xcode project? 2) I have an application I'm developing (in Cocoa for OS X) mainly to explore some math concepts I'm interested in, for my own use. Since it is by nature exploratory, it seems like a good idea to have an extension language. Scheme seems like a good choice. Are there any good examples or tutorials that would get me started using Gambit to add an embedded extension language to an Xcode project? --- Googling is frustrating because of so many hits about chess, Xcode schemes, cocoa importing, and so on, but I've tried as many combinations as I can think of. The only thing I've found that is possibly useful is from http://jlongster.com/legacy/scheme-iphone-apps.html, which is stated to be out-of-date, and the link for an up to date reference doesn't work. I spent a lot of hours a while back getting a Fibonacci generator written in Haskell into a cocoa application. I published this on the Haskell Wiki. The process was so onerous I never tried it again. Hope this isn't also true of Scheme. Thanks, John Velman

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Gambit and Automake
by Diogo F. S. Ramos 01 Avr '11

01 Avr '11

I'm using Automake -- and Autoconf FWIW -- to compile gambit programs and I wonder if anyone else is doing it. I've setup a Makefile.am but I'm not very happy with it. I fell that there probably is a better way. Is anyone doing it? I know I could have done something like: foo: $(foo_SOURCES) gsc -o $@ -exe $^ But I wanted something more fine grained. Well, here goes my Makefile.am: LDFLAGS = -lgambc -lm -ldl -lutil bin_PROGRAMS = foo foo_SOURCES = foo.scm linker.c CLEANFILES=linker.c .scm.o: LINK=gcc -o $@ $(LDFLAGS) %.o: %.scm linker.c gsc -obj $< linker.c: $(filter %.scm,$(foo_SOURCES)) gsc -o $@ -link $^ -- Diogo F. S. Ramos

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Fw: Re: Creating Windows GUI Apps in Gamit
by Steve Graham 01 Avr '11

01 Avr '11

--- On Fri, 4/1/11, Steve Graham <jsgrahamus(a)yahoo.com> wrote: From: Steve Graham <jsgrahamus(a)yahoo.com> Subject: Re: [gambit-list] Creating Windows GUI Apps in Gamit To: "Marc Feeley" <feeley(a)iro.umontreal.ca> Date: Friday, April 1, 2011, 6:12 PM I installed Gambit and compiled the sample program under Win7 and under MinGW. In each case it took 40-44 seconds. I also notice that when I type typical commands in the shell, such as ls or ps or which, they take several seconds to execute. Any ideas why that might be? Following is PATH within the shell: sh-3.1$ echo $PATH/c/Program Files (x86)/Chez Scheme Version 8.2/bin/i3nt:/c/Unicon/bin:/c/Program Files (x86)/Unicon/bin:/c/windows/system32:/c/windows:/c/windows/System32/Wbem:/c/windows/System32/WindowsPowerShell/v1.0/:/c/Program Files (x86)/ATI Technologies/ATI.ACE/Core-Static:/c/windows/system32/gs/gs8.71/bin:/c/Program Files (x86)/GnuWin32/bin:/c/Program Files (x86)/Common Files/GTK/2.0/bin:/c/Program Files (x86)/MzScheme:/c/OpenSSL-Win32/bin:/c/Users/Steve/Desktop:/c/Program Files (x86)/QuickTime/QTSystem/:/c/Program Files (x86)/Calibre2/:/c/Program Files (x86)/clisp-2.49:/c/Program Files (x86)/clisp-2.49:/c/Program Files (x86)/clisp-2.49:/c/Program Files (x86)/Common Files/HP/Digital Imaging/bin:/c/Program Files (x86)/HP/Digital Imaging/bin/:/c/Program Files (x86)/HP/Digital Imaging/bin/Qt/Qt 4.3.3:/c/gambit/v4.6.1/bin:/mingw/bin:/usr/bin:/c/Program Files (x86)/Git/bin/:/c/Program Files (x86)/Steel Bank Common Lisp/1.0.37/sh-3.1$ Thanks for all of your help. Steve --- --- On Fri, 4/1/11, Marc Feeley <feeley(a)iro.umontreal.ca> wrote: From: Marc Feeley <feeley(a)iro.umontreal.ca> Subject: Re: [gambit-list] Creating Windows GUI Apps in Gamit To: "Steve Graham" <jsgrahamus(a)yahoo.com> Date: Friday, April 1, 2011, 5:45 PM On 2011-04-01, at 5:17 PM, Steve Graham wrote: > It seems strange to me, too. > > Gambit was installed as part of a JazzScheme install. > That explains why it is not in your path. You should add the bin directory of Gambit to your path, or install Gambit using the Windows installer. It is OK to have two Gambits installed. Marc

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New gcc and gambit
by Bradley Lucier 01 Avr '11

01 Avr '11

I tried some preliminary tests of the newly released gcc-4.6.0 with Gambit, and things look pretty good. I was looking just at how long the routine direct-fft-recursive-4 in lib/_num.scm took to execute on an array of $2^{25}$ complex doubles. Here are various execution times comparing gcc-4.6.0 with the gcc-4.5.1 that ships with Ubuntu 10.10. I just did "./configure CC=...; make" on plain manilla gambit-4.6.0 with default optimization "-O1 -fschedule-insns2": 4.5.1: 3180 ms cpu time (3160 user, 20 system) 4.6.0: 2910 ms cpu time (2910 user, 0 system) That's quite the improvement, nearly 10% I also added -fschedule-insns to the optimization list: 4.5.1 -fschedule-insns: 2870 ms cpu time (2870 user, 0 system) 4.6.0 -fschedule-insns: 2730 ms cpu time (2730 user, 0 system) Still about a 5% improvement. Since there are 5 N \log_2 N operations in an FFT of size N, that last time represents 1.536 Gflops on my model name : Intel(R) Core(TM)2 Quad CPU Q8200 @ 2.33GHz FFTW3 out-of-place (i.e, the same result, but not the same algorithm) achieves almost exactly 2 Gflops on a 3.0 GHz machine with a better memory system: http://www.fftw.org/speed/CoreDuo-3.0GHz-icc64/ Scaling the results on my machine to the higher clock rate gives > (* 1.56 3.0 (/ 2.33)) 2.008583690987124 (I don't feel like benchmarking fftw3 on my own machine, sorry.) So who says you can't do scientific computing in Scheme? Brad PS: This is no April Fools joke!

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Disabling mail
by Eliot Handelman 01 Avr '11

01 Avr '11

Hi Marc, I've been trying to disable mail delivery with no success -- any clues? Best wishes, -- eliot

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Fw: Re: Creating Windows GUI Apps in Gamit
by Steve Graham 01 Avr '11

01 Avr '11

--- On Fri, 4/1/11, Steve Graham <jsgrahamus(a)yahoo.com> wrote: From: Steve Graham <jsgrahamus(a)yahoo.com> Subject: Re: [gambit-list] Creating Windows GUI Apps in Gamit To: "Marc Feeley" <feeley(a)iro.umontreal.ca> Date: Friday, April 1, 2011, 4:25 PM sh-3.1$ time gsc -exe windows-gui-example.scmsh: gsc: command not found real 0m3.107suser 0m0.015ssys 0m0.046s sh-3.1$ gsc -vsh: gsc: command not foundsh-3.1$ ls gambc-cc.bat gsi.exe six-script.batgambc-doc.bat scheme-ieee-1178-1990.bat six.exegsc-script.bat scheme-r4rs.bat windows-gui-example.exegsc.exe scheme-r5rs.bat windows-gui-example.scmgsi-script.bat scheme-srfi-0.bat sh-3.1$ time gsc.exe -exe windows-gui-example.sh: gsc.exe: command not found real 0m3.135suser 0m0.015ssys 0m0.047ssh-3.1$ --- On Fri, 4/1/11, Marc Feeley <feeley(a)iro.umontreal.ca> wrote: From: Marc Feeley <feeley(a)iro.umontreal.ca> Subject: Re: [gambit-list] Creating Windows GUI Apps in Gamit To: "Steve Graham" <jsgrahamus(a)yahoo.com> Cc: "gambit List" <Gambit-list(a)iro.umontreal.ca> Date: Friday, April 1, 2011, 3:49 PM On 2011-04-01, at 2:15 PM, Steve Graham wrote: > I compiled the sample program from the Win 7 command prompt and it took 40+ seconds. I double checked to make sure, and it takes 1 second on my MBP (running Windows). See the details below. If it takes 40 seconds for you, there is definitely something wrong with your setup, unless your computer is very old! I used the latest Gambit (v4.6.1) installed using the installer downloaded from the Gambit web page. Marc $ time gsc -exe windows-gui-example.scm real 0m1.078s user 0m0.031s sys 0m0.000s $ gsc -v v4.6.1 20110325124526 i686-pc-mingw32 "./configure --prefix=C:/Gambit-C/././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././. --enable-multiple-versions --enable-symlinks --enable-single-host" $ gcc -v Reading specs from c:/mingw/bin/../lib/gcc/mingw32/3.4.5/specs Configured with: ../gcc-3.4.5-20060117-3/configure --with-gcc --with-gnu-ld --with-gnu-as --host=mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-nls --enable-languages=c,c++,f77,ada,objc,java --disable-win32-registry --disable-shared --enable-sjlj-exceptions --enable-libgcj --disable-java-awt --without-x --enable-java-gc=boehm --disable-libgcj-debug --enable-interpreter --enable-hash-synchronization --enable-libstdcxx-debug Thread model: win32 gcc version 3.4.5 (mingw-vista special r3)

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Re: [gambit-list] Creating Windows GUI Apps in Gamit
by Marc Feeley 01 Avr '11

01 Avr '11

On 2011-04-01, at 2:15 PM, Steve Graham wrote: > I compiled the sample program from the Win 7 command prompt and it took 40+ seconds. I double checked to make sure, and it takes 1 second on my MBP (running Windows). See the details below. If it takes 40 seconds for you, there is definitely something wrong with your setup, unless your computer is very old! I used the latest Gambit (v4.6.1) installed using the installer downloaded from the Gambit web page. Marc $ time gsc -exe windows-gui-example.scm real 0m1.078s user 0m0.031s sys 0m0.000s $ gsc -v v4.6.1 20110325124526 i686-pc-mingw32 "./configure --prefix=C:/Gambit-C/././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././././. --enable-multiple-versions --enable-symlinks --enable-single-host" $ gcc -v Reading specs from c:/mingw/bin/../lib/gcc/mingw32/3.4.5/specs Configured with: ../gcc-3.4.5-20060117-3/configure --with-gcc --with-gnu-ld --with-gnu-as --host=mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-nls --enable-languages=c,c++,f77,ada,objc,java --disable-win32-registry --disable-shared --enable-sjlj-exceptions --enable-libgcj --disable-java-awt --without-x --enable-java-gc=boehm --disable-libgcj-debug --enable-interpreter --enable-hash-synchronization --enable-libstdcxx-debug Thread model: win32 gcc version 3.4.5 (mingw-vista special r3)

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Re: [gambit-list] Creating Windows GUI Apps in Gamit
by Marc Feeley 01 Avr '11

01 Avr '11

On 2011-04-01, at 12:39 PM, Steve Graham wrote: > Thanks, Marc. That created a basic window (see attached). I was surprised how long it took to compile on my Win 7 machine with 4 gb of RAM. You mean the time to compile Gambit or to compile the sample program? On my MacBook Pro (2.8 GHz with 4 GB RAM), a "make -j 4" of Gambit takes 72 seconds (configured with --enable-single-host). The compilation time can vary *a lot* depending on the gcc version because some of the algorithms gcc has used in the past don't scale well. For the sample program I sent it takes a second or two to compile. > > Do you have any examples of using input elements (drop down lists, text field, text area, radio button)? I've found this Win32 programming tutorial to be useful with basic GUI programming on Windows. http://www.winprog.org/tutorial/ Marc

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Automatic build system for Gambit
by Paul Wolneykien 01 Avr '11

01 Avr '11

Hi, I'm thinking of a semi-automatic system for building new releases of Gambit tracking the main Git repository at http://www.iro.umontreal.ca/~gambit/repo/gambit.git . I suppose the process as follows: when a new release tag is published, the procedure updates the local branch and build a new version of the Gambit, possibly with the help of a previously built one. The main problem with that is that I can't see a way to provide a consequently updated build environment as stated in http://dynamo.iro.umontreal.ca/~gambit/wiki/index.php/Contributing_Patches_…. The only thing that can be consequently updated is the clean local source tree (with no generated files) as it published at the main Git repository. That's because each build is handled in a separate environment constructing from scratch. However, the result of a previous build is available in the form of RPM package. So I've tried to use a previous version of Gambit (4.5.3) to build the fresh release (4.6.0) linking /usr/bin/gsc to gsc-comp in the source tree root: both `make bootstrap' and `make' finished with an error message about gsc version incompatibility. Dear community, is it generally possible to build Gambit: a) having only the sources published at the main Git repository? b) having only a) and a previous version of Gambit installed? If not, is the *-devel tarball is absolutely necessary to build Gambit? And if so, can it be prepared from the main Git repository? Best regards, Paul.

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Gambit-list Avril 2011