Gambit-list Janvier 2012

gambit-list@iro.umontreal.ca

27 participants
25 discussions

Edge triggered I/O with libevent
by Adam Langley 04 Avr '13

04 Avr '13

Gambit uses the select call on POSIX systems to multiplex IO operations. This is fine for small numbers of file descriptors, but falls apart quickly with large numbers[1]. libevent[2] is a wrapper library around a number of modern IO multiplexing systems (epoll on Linux, kqueue on the BSDs as well as poll and select). Attached is a patch which converts Gambit to using edge triggered I/O with epoll and libevent. This also requires a patch (attached) of libevent since the standard distribution doesn't include edge triggering support and the upstream appears to be on holiday. (epoll is required because I don't have a BSD box on which to develop edge triggering support for kqueue) This patch (for Gambit) preprocesses away to nothing unless --enable-libevent is passed to the configure script. (Note that, since this patches the configure.ac script, you'll need to run autoconf to regenerate). I hope I've not broken anything, but at this stage I've only tested that the console and tcp ports work. This patch (in the future) should also allow people, who write programs which use socket calls directly, to integrate into the main event loop at some point. Testing is more than welcome and, if you find a form of IO which is broken, please email me. [1] http://monkey.org/~provos/libevent/libevent-benchmark2.jpg [2] http://monkey.org/~provos/libevent/ -- Adam Langley agl(a)imperialviolet.org http://www.imperialviolet.org (+44) (0)7906 332512 PGP: 9113 256A CC0F 71A6 4C84 5087 CDA5 52DF 2CB6 3D60

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sxml>>xml layout question.
by Hendrik Boom 17 Fév '12

17 Fév '12

Well I got Blackhole to work though I'll still be posting a few suggestions and questions later. I used it to import and use sxml>>xml successfully. It gives me output like ><P >P5There seems to be nothing to say. <S />After a while he stammers, "Oh, I'm sorry," to fill the silence.</P ><P >P3</P instead of the more conventional <P> P5There seems to be nothing to say. <S/>After a while he stammers, "Oh, I'm sorry," to fill the silence.</P> <P> P3</P> Is there a technical reason to have the '>' after the newline and the indentation layout instead of before them? Or is this just the way it happened to get coded? (Don't worry about the P5There and such -- my application put them there by mistake and I'll be dealing with them myself) -- hendrik

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slime (swank) and gambit
by Attila Lendvai 13 Fév '12

13 Fév '12

dear list, i'm a new hacker on board. i'm planning to use gambit on an embedded device. i have many years of CL experience, but i'm open for anything good. i have quite some background with slime and been using it and hacking on it for long years, so i'd like to use it with gambit. i've seen this mail, but noone answered: https://mercure.iro.umontreal.ca/pipermail/gambit-list/2011-August/005262.h… what is the status of swank-gambit? who is the current maintainer? where is its official repo? i've found two, but neither seems anything like 'official', but rather a random repo on github. https://github.com/jlongster/swank-gambit https://github.com/shortsightedsid/swank-gambit i'm planning to invest time into making it more useful, but i don't want to waste efforts on something that has already been done, just hidden from my google skills. any answers/hints are greatly appreciated, -- attila Notice the erosion of your (digital) freedom, and do something about it! PGP: 2FA1 A9DC 9C1E BA25 A59C 963F 5D5F 45C7 DFCD 0A39 OTR XMPP: 8647EEAC EA30FEEF E1B55146 573E52EE 21B1FF06

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compiling Gambit 4.6.3 under MinGW/MSys
by REPLeffect 01 Fév '12

01 Fév '12

I just thought I'd share this in case it helps someone else. To compile Gambit 4.6.3 in the MinGW/MSys shell, I had to add the following flags to the gcc commands for compiling C files to object files: -fpermissive -fno-keep-inline-dllexport Recent versions of MinGW use gcc version 4.6.1, which I suspect has stricter default requirements on the C code than prior versions of gcc, and I believe that's why I had to add -fpermissive. The -fno-keep-inline-dllexport flag was added because I was getting an out of memory error compiling at least one C file. I also added -Wno-write-strings because I was tired of warning messages. It's a bit of a hack (and I'm sure there is a more correct place to put this), but I modified the configure script to do this by adding it in the FLAGS_OBJ line here: case "$target_os" in mingw*) # add Windows libraries needed by MinGW LIBS="$LIBS -lws2_32" FLAGS_OBJ="$FLAGS_OBJ -D_WINDOWS -Wno-write-strings -fpermissive -fno-keep-inline-dllexport" If Marc (or others) want more detail, I'd be happy to oblige. I can extract the 4.6.3 tar file somewhere else and try to build it, and not the exact error messages, etc.

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Question about Windows installer
by Bradley Lucier 30 Jan '12

30 Jan '12

Marc: I have a student who's downloaded the Visual C Gambit package for Windows; the Gambit 4.6.3 compile script calls cl.exe, but this page http://msdn.microsoft.com/en-us/library/9s7c9wdw%28v=vs.80%29.aspx (found doing a google search for cl.exe) says that this script is available only on Windows 2000, Windows XP and Windows Server 2003 operating systems. He's running Windows 7. He's willing to install MinGW and see how that works on his box, but do you need to update the Visual C compiler version of Gambit? Brad

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Gambit and iOS5 sandbox
by Francois Magnan 30 Jan '12

30 Jan '12

Hi, I encountered a strange problem in our iOS app when trying to build for iOS5. Here is what I get in the console before the app crashes: Jan 26 19:52:41 unknown sandboxd[3643] <Notice>: Topos(3639) deny file-ioctl /private/var/mobile/Applications/ABA9866E-15FA-4416-84E7-5FC45665D339/Documents/export.kml It seems that some file-ioctl operations that Gambit uses for writing files are disabled in the sandbox environment. Is there an easy solution to that? Thank you, Francois Magnan

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define-type
by Álvaro Castro-Castilla 28 Jan '12

28 Jan '12

Hi, Does anyone know what are these define-type parameters? - *id:* - *constructor:* - *constant-constructor:* - *predicate:* - *implementer:* - *type-exhibitor:* - *prefix:* - *opaque:* - *macros:* Field attributes - Field attributes: - *read-write:* - *read-only:* non mutable field - *equality-test:* - *equality-skip:* the *equal?* function will ignore this field - *printable:* - *unprintable:* the *write* function will ignore it - *init:* *cst* initial value It would be very nice to document it in the gambit wiki page: http://dynamo.iro.umontreal.ca/~gambit/wiki/index.php/Documentation:Special… Best regards, Álvaro Castro-Castilla

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Error from "make check" under MinGW build
by REPLeffect 26 Jan '12

26 Jan '12

I just successfully built Gambit with in a fresh MinGW/MSys environment -- MinGW/MSys were just installed last month. Everything builds fine, but I get these errors when running "make check": ------------ TEST 2 (error handling) ../gsi/gsi -:h4000,~~bin=../bin,~~lib=../lib,~~include=../include -f error.scm < error.scm > test2.out diff test2.ok test2.out && rm -f test2.out 1172c1172,1173 < ;;; (Argument 1) OUTPUT PORT expected: (newline #f) --- > ;;; (Argument 1) OUTPUT PORT expected: (ne > wline #f) 1191d1191 < (create-directory "newdir1") => #!void 1193,1197c1193,1198 < ;;; #<os-exception #9>: (create-directory "newfile1") < (rename-file "newdir1" "newdir2") => #!void < ;;; No such file or directory: (rename-file "newdir1" "newdir2") < (rename-file "newfile1" "newdir2/aaa") => #!void < ;;; No such file or directory: (rename-file "newfile1" "newdir2/aaa") --- > ;;; #<os-exception #9>: (create-directory "newdir1") > ;;; #<os-exception #10>: (create-directory "newfile1") > ;;; #<os-exception #11>: (rename-file "newdir1" "newdir2") > ;;; #<os-exception #12>: (rename-file "newdir1" "newdir2") > ;;; #<os-exception #13>: (rename-file "newfile1" "newdir2/aaa") > ;;; #<os-exception #14>: (rename-file "newfile1" "newdir2/aaa") 1214,1215c1215,1216 < ;;; #<os-exception #10>: (delete-directory "newdir2") < (delete-file "newdir2/aaa") => #!void --- > ;;; #<os-exception #15>: (delete-directory "newdir2") > ;;; #<os-exception #16>: (delete-file "newdir2/aaa") 1218,1219c1219,1220 < (delete-directory "newdir2") => #!void < (open-process '(path: "sort" arguments: ("input") eol-encoding: cr-lf)) => #<input-output-port #11 (process "sort" "input")> --- > ;;; #<os-exception #17>: (delete-directory "newdir2") > (open-process '(path: "sort" arguments: ("input") eol-encoding: cr-lf)) => #<input-output-port #18 (process "sort" "input")> make[1]: *** [test2] Error 1 make[1]: Leaving directory `/tstbld/gambit/gambc-v4_6_2-devel/tests' make: *** [check] Error 2 Seems strange (and a bit amusing) how there is a newline character in the middle of the word "newline" in test output. Just to test, I installed Gambit to the machine (which is running Windows XP) using the binary distribution from the Gambit website. Then I ran the test manually using: {path-to-installed-gsi}/gsi -:h4000,~~bin={path-to-installed-gsi}/bin,~~lib={path-to-installed-gsi}/lib,~~include={path-to-installed-gsi}/include -f error.scm < error.scm I was kind of expecting the test to succeed, but it gave the same error output (with "newline" split into to pieces). Any idea what is causing this?

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How to ue a module?
by Hendrik Boom 25 Jan '12

25 Jan '12

I just made bootstrap from the 4.6.1 development sources, which I downloaded using git. When I start gsi and, according to the section "Subdivide code into modules" in the tour of Scheme in Gambit, I use "use" it tells me hendrik@notlookedfor:~/dv/lang/gambit/gambit$ gsi/gsi Gambit v4.6.1 > (use ssax-sxml) *** ERROR IN (console)(a)1.2 -- Unbound variable: use 1> So evidently something is still missing, unconfigured, unbuilt, or whatever. It doesn't even get around to looking for the library -- which is another question: how does it find the libraries, assuming it gets that far. And if the X module system is itself a module, how do I bootstrap it into the system? Or should I be using an entirely different mechanism? -- hendrik

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Blackhole for Android
by Álvaro Castro-Castilla 25 Jan '12

25 Jan '12

Hi! Finally I got Blackhole working for Android. For those interested, I'm developing a tiny framework for making games in Android (plus other platforms) using Gambit and the Blackhole module system. If you want to give it a try: https://github.com/alvatarc/anygame You'll need to use my fork of Blackhole, which is pending Per's review before pulling into his master branch: https://github.com/alvatarc/blackhole Basically, what this fork allows is a special flag --to-c (or -C) : bh exe -C main.scm this allows compilation of all needed modules to c, plus the link file. It also outputs the generated files' path to stderr in case you need this information. Please, let me know if you find any errors or mistakes, I'll be happy to fix and help. Best regards, Álvaro Castro-Castilla

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Gambit-list Janvier 2012