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syntax-case and define
by Lam Luu 11 Nov '09

11 Nov '09

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everyone, I am trying to write some Scheme code, and I use define-syntax and syntax-rules very heavily. However, whenever syntax-case.scm is loaded/included, define special form does not work with #!key, #!optional, and #!rest anymore. ##define, on the other hand, is not very portable between Scheme implementation. Is there anyway to work around this situation? I have tried to put (namespace ("##" define)) in, but that produces no difference. Thank you, Lam Luu -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ iEYEARECAAYFAkr62M4ACgkQwnXdyzbwLCVFWgCfcBbJAr4UUKW/2IVrKPYlvSe7 mpMAnRNzWQfzR+66MRfl66Y12UY3FT7Z =KzQQ -----END PGP SIGNATURE-----

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Problem with specification of libdir
by Lam Luu 11 Nov '09

11 Nov '09

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everyone, I tried to package Gambit-C in rpm. I use the configuration as: ./configure --enable-single-host --enable-gcc-opts - --enable-multiple-versions --bindir=/usr/bin - --includedir=/usr/include/gambit-c --docdir=/usr/share/doc/gambit-c - --infodir=/usr/share/info --datadir=/usr/share/gambit-c - --libdir=/usr/lib/gambit-c make make install DESTDIR=$RPM_BUILD_ROOT However, the result file, when tried to (include "~~/syntax-case.scm"), still says that "Cannot find file /usr/local/Gambit-C/v.4.5.3/syntax-case.scm", which is weird. I have changed the configure argument, with - --prefix=/usr/share/gambit-c, and omit the libdir, so things work right now. Still, the above phenomenon is weird. Can someone please have a look at this! Thank you, Lam Luu -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ iEYEARECAAYFAkr6uVsACgkQwnXdyzbwLCX4XQCfe9AZV325fcoAh6wfU15fWhpU w44AoKeSm5QcRAY23dHWhmHCXAFXxmKb =zA6T -----END PGP SIGNATURE-----

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using #defined values
by Aditya Godbole 11 Nov '09

11 Nov '09

Hi, Is it possible to use preprocessor declarations in scheme code? If say: (c-declare #<<c-declare-end #define ABC 1000 c-declare-end ) Is there a way to use ABC when passing a value to a c-lambda? -aditya

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Real Threads
by lowly coder 10 Nov '09

10 Nov '09

The correct answer is probably "try it"; but I just want to see if there are non-deterministic gotchas I need to be aware of. I have the following setup in mind: I have C++ ffi that create threads. Real Linux OS threads. So I startup gambit gsi (in OS thread 0) ; it calls the C++ ffi code; creating linus OS thread (OS Thread 1) in the same address space. OS Thread 1 never makes any calls to gambit. Thread 0 & Thread 1 do not have any race conditions in C++ land. Are there any other gotchas I should worry about, or am I relatively safe? Months ago, I was complaining about gc pauses; well now, I've moved rendering entirely into C++ land with it's own thread and all that. Now, I'm thinking of bringing gambit back in. In particular, I'm planning on using the pthreads library. Thanks!

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Avoid make_array
by Alex Queiroz 06 Nov '09

06 Nov '09

Hallo, I have been profiling my Reversi AI and got some good speed ups. Now a large part of my running time is spent in a function called mark_array, in mem.c. It seems to be part of the garbage collector. I already allocate a large heap when the Gambit runtime is started, is there another way to call this function not so many times? Cheers, -- -alex @asandroq http://www.ventonegro.org/

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latest git checkout won't build
by Martin DeMello 06 Nov '09

06 Nov '09

This is from a clean git checkout: $ git show HEAD commit 67cdc0881278fd734f10e4299f582fb0f649230e $ gcc -v Using built-in specs. Target: i686-pc-linux-gnu Configured with: ../configure --prefix=/usr --enable-shared --enable-languages=c,c++,fortran,objc,obj-c++,ada --enable-threads=posix --mandir=/usr/share/man --infodir=/usr/share/info --enable-__cxa_atexit --disable-multilib --libdir=/usr/lib --libexecdir=/usr/lib --enable-clocale=gnu --disable-libstdcxx-pch --with-tune=generic Thread model: posix gcc version 4.4.2 (GCC) $ ./configure --enable-single-host --prefix=/home/martin/opt/gambit-c $ make making all in include make[1]: Entering directory `/home/martin/opt/gambit/include' major=`echo v4.5.3 | sed -e "s/v//g" -e "s/\.[^.]*\.[^.]*//g"`; \ minor=`echo v4.5.3 | sed -e "s/v[^.]*\.//g" -e "s/\.[^.]*//g"`; \ revision=`echo v4.5.3 | sed -e "s/v[^.]*\.[^.]*\.//g" -e "s///g"`; \ version_num=`eval expr "$ 100000 \\* $major $ + $ 1000 \\* $minor $ + $revision"`; \ echo "#error \"The version indicated in ___VERSION is not supported by gambit.h\"" > gambit-not$version_num.h; \ echo "#error \"You are probably compiling C code generated by a Gambit compiler earlier or later than v4.5.3\"" >> gambit-not$version_num.h; \ echo "#error \"___VERSION will be set to $version_num to reduce other errors\"" >> gambit-not$version_num.h; \ echo "#undef ___VERSION" >> gambit-not$version_num.h; \ echo "#define ___VERSION $version_num" >> gambit-not$version_num.h; \ echo "#include \"gambit.h\"" >> gambit-not$version_num.h make[1]: Leaving directory `/home/martin/opt/gambit/include' making all in lib make[1]: Entering directory `/home/martin/opt/gambit/lib' gcc -Wno-unused -O1 -fno-math-errno -fschedule-insns2 -fno-trapping-math -fno-strict-aliasing -fwrapv -fomit-frame-pointer -fPIC -fno-common -mieee-fp -I"../include" -c -o "_io.o" -I. -DHAVE_CONFIG_H -D___GAMBCDIR="\"/home/martin/opt/gambit-c\"" -D___SYS_TYPE_CPU="\"i686\"" -D___SYS_TYPE_VENDOR="\"pc\"" -D___SYS_TYPE_OS="\"linux-gnu\"" -D___CONFIGURE_COMMAND="\"./configure --enable-single-host --prefix=/home/martin/opt/gambit-c\"" -D___OBJ_EXTENSION="\".o\"" -D___EXE_EXTENSION="\"\"" -D___PRIMAL _io.c -D___LIBRARY In file included from ../include/gambit.h:12, from _io.c:1310: ../include/gambit-not405003.h:1:2: error: #error "The version indicated in ___VERSION is not supported by gambit.h" ../include/gambit-not405003.h:2:2: error: #error "You are probably compiling C code generated by a Gambit compiler earlier or later than v4.5.3" ../include/gambit-not405003.h:3:2: error: #error "___VERSION will be set to 405003 to reduce other errors" make[1]: *** [_io.o] Error 1 make[1]: Leaving directory `/home/martin/opt/gambit/lib' make: *** [all-recursive] Error 1

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What happened with Scheme on Skis?
by Alfonso Urroz 05 Nov '09

05 Nov '09

Hello there Schemers!!!. What happened with Scheme on Skis?, where can I get information about using Scheme for web development? Thanks. Alfonso G. Urroz

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FOREIGN object types
by Valeriya Pudova 03 Nov '09

03 Nov '09

Does anyone have an example of using FOREIGN object types to transfer C structures between C code and Scheme code?

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[ANN] Gambit-C v4.5.3 released
by gambit＠iro.umontreal.ca 02 Nov '09

02 Nov '09

1 0

debugging heap overflow
by Stéphane Le Cornec 31 Oct '09

31 Oct '09

Once in a blue moon, I manage create a runaway process. I use -:h500000 to stop it before it eats all the memory and it stops in the debugger. Perfect! Now here's the problem: *** ERROR IN jazz.system-exception-hook, "../jazz/lib/jazz/src/jazz/ dialect/core/exception.scm"@65.3 -- Heap overflow exc == '#<heap-overflow-exception #6> other == ##thread-end-with-uncaught-exception! 1> ,b *** ERROR IN jazz.system-exception-hook, "../jazz/lib/jazz/src/jazz/ dialect/core/exception.scm"@65.3 -- Heap overflow exc == '#<heap-overflow-exception #6> other == ##thread-end-with-uncaught-exception! 1> ,q logout Is there a way to use the debugger, to see the runaway stack, or is it completely locked out?

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