Gambit-list Mars 2010

gambit-list@iro.umontreal.ca

25 participants
21 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

2 2

How to pass a u8vector to the FFI
by Mikael 20 Sep '11

20 Sep '11

You do this, by declaring the passed u8vector as a scheme-object in the c-lambda definition. The memory pointer to the u8vector's contents in the C code is resolved by void *u8vectorptr = ___CAST(void*,&___FETCH_U8(___BODY(theu8vectorschemeobjectvariable),___INT(0))); Remember that the pointer is only to be kept until the next return to Scheme. Mikael 2010/3/30 Álvaro Castro-Castilla <alvaro.castro.castilla(a)gmail.com> > Hi! > > Is there a way to pass a u8-vector to a FFI interface somehow? > The way I expect this to work is through a (pointer unsigned-char), but it > obviously doesn't work, claiming a proper C pointer. I would like to be able > to build this arrays from Scheme code. Is there a way? > > Currently I have to call a FFI function to set char by char, calling the > c-lambda function too many times. > > One thing that could work is something that converts u8-vectors to unsigned > char* arrays, does that exist in Gambit? > > > Thanks, > > Álvaro > > _______________________________________________ > Gambit-list mailing list > Gambit-list(a)iro.umontreal.ca > https://webmail.iro.umontreal.ca/mailman/listinfo/gambit-list > >

6 10

passing a vector to FFI functions
by Álvaro Castro-Castilla 30 Mar '10

30 Mar '10

Hi! Is there a way to pass a u8-vector to a FFI interface somehow? The way I expect this to work is through a (pointer unsigned-char), but it obviously doesn't work, claiming a proper C pointer. I would like to be able to build this arrays from Scheme code. Is there a way? Currently I have to call a FFI function to set char by char, calling the c-lambda function too many times. One thing that could work is something that converts u8-vectors to unsigned char* arrays, does that exist in Gambit? Thanks, Álvaro

1 0

problem with 'make update'
by Breanndán Ó Nualláin 29 Mar '10

29 Mar '10

I tried to build an up-to-date version of Gambit on Ubuntu 9.10 following the instructions here: http://dynamo.iro.umontreal.ca/~gambit/wiki/index.php/Contributing_Patches_… This is the sequence of commands used: $ cd ~/code/src/ $ wget -c http://www.iro.umontreal.ca/~gambit/download/gambit/v4.3/source/gambc-v4_3_… $ tar zxf gambc-v4_3_2-devel.tgz $ rm -rf gambit $ mv gambc-v4_3_2-devel gambit $ cd gambit $ ./configure --enable-single-host --enable-gcc-opts --prefix=/usr/local/lib/gambit $ make bootstrap $ make update It fails at this point while trying to make all in ./lib The command it fails on is ../gsc-comp -:~~bin=../bin,~~lib=../lib,~~include=../include -f -c -check _io.scm The error message is that the usage of the gsc-comp command is incorrect. Any suggestions welcome.

4 5

Manuel Serrano, La programmation diffuse
by Bradley Lucier 25 Mar '10

25 Mar '10

http://www.college-de-france.fr/documents/video/gberry/cours2009/berry-serr… Trying to keep up with Manuel's french made my head hurt (maybe my cold has something to do with it, too), but this lecture at the College de France was interesting while I followed it. Brad

1 0

compiling javascript syntax to scheme
by James Long 25 Mar '10

25 Mar '10

Hey guys, I'm thinking about a product I want to develop in the future, and I think a crucial point will be to convince non-Scheme developers to use it, and possibly convert them to Scheme programmers. I want to include a "scripting" language in my product which has the syntax of Javascript. I want to compile this language to Scheme. This is exactly what SIX does in Gambit, but SIX doesn't quite have the grammar I want and is incomplete (I think "return" does nothing?). Is anyone else interested in working on this? I need to look at the SIX compiler in Gambit. I could either extend it, or write a parser from scratch using something like SILex. I love the idea of SIX (including a built-in infix grammar), but is it used anywhere? Is anyone interested in improving SIX to make it more usable as an actual language? - James

7 10

gambit-c 4.6.0, cairo and valgrind.
by Vladimir Konrad 25 Mar '10

25 Mar '10

Hello, Should a correct program compiled with gambit-c always show zero lost bytes (memory leaks) under valgrind? The reason I ask is that "dynamic languages" sometimes show funny under valgrind (AFAIR). I am using gambit-c with cairo bindings (version 2 from dumping grounds), the program is currently short and simple, and calls cairo destroy functions when I think it should. What it currently does: it reads (in sequence) pairs of .png images from a directory full of .png images, does xor on them and then releases resources (currently it does not write results). It is quite possible that the bug is at the front of the keyboard ;-), but would you have any pointers on how to start tracking this down? When I run: valgrind --leak-check=full ./my-program It gives me some hex numbers (function addresses?), but what do I do with these? Also, I have tested this under 2 different versions of 64 bit linux and libcairo, both show a leak, but not the same size. Kind regards, Vladimir ------ > because it reverses the logical flow of conversation + it is hard to follow. >> why not? >>> do not put a reply at the top of the message, please... Please access the attached hyperlink for an important electronic communications disclaimer: http://www.lse.ac.uk/collections/planningAndCorporatePolicy/legalandComplia…

2 6

gambit-c and black-home module system - how to produce stand alone executable?
by Vladimir Konrad 24 Mar '10

24 Mar '10

Hello, I am using gambit-c v4.6.0 and the latest black-hole (including std libraries) from git (as described on the gambit-c web site). In the gsc interpreter, all seems fine and I can load black-hole and import installed std libraries, while using the repl. The "my-program.scm", does _not_ load the black hole (AFAIK, I am supposed to do from command line, using -e), and it does only following import (before any functions from std are used): (import (std srfi/13 srfi/95)) The all of std are compiled to .o1 files (as described in the black-hole guide) One thing I cannot figure out - how do I produce stand alone, compiled, executable when using black-hole modules? So far, I tried (gsc-gambit is gambit-c compiler executable name): gsc-gambit -exe -e '(load "~~/lib/modules/build")' my-program.scm the above compiles, but when run, the my-program does not have functions from gsc-gambit -ld-options "-rpath-link /home/vladimir/opt/gambc/lib/modules:/home/vladimir/opt/gambc/lib/modules/std/srfi build.o1 13.o1 95.o1" -exe -e '(load "~~/lib/modules/build")' my-program.scm the above fails with "gcc unrecognised option". I have searched the mailing list, read what I could, tried what I could think of, but now I am quite stuck... Kind regards, Vladimir ------ > because it reverses the logical flow of conversation + it is hard to follow. >> why not? >>> do not put a reply at the top of the message, please... Please access the attached hyperlink for an important electronic communications disclaimer: http://www.lse.ac.uk/collections/planningAndCorporatePolicy/legalandComplia…

3 4

Uncaught exception hook
by Mikael 23 Mar '10

23 Mar '10

Marc, I need to catch uncaught exceptions in a set of threads over here, in a way that's transparent to Gambit's regular behavior (which is to print the error out in the REPL, and open a new level in the REPL for it, and allow backtraces etc.). I want to know how to do this in two different ways (for different purposes): (a) Globally to the application (something like ##thread-make-repl-channel, but where I get the exception, and that is executed only on uncaught exceptions, not also on GC reports etc.) (b) In a specific scope, i.e. a with-exception-listener , other than that like with-exception-catcher/handler. I.e. I get any exception thrown, into a thunk, and when the thunk returns, the exception is passed on just like if the thunk had not been invoked at all (thrown into the REPL or any exception-catcher/handler outside of it). How is this done? Thank you, Mikael

1 0

JazzScheme 2.3 release
by Guillaume Cartier 22 Mar '10

22 Mar '10

This is an announce for the release of JazzScheme 2.3 (www.jazzscheme.org). JazzScheme is a development system based on extending the Scheme programming language and the Gambit system. It includes a module system, hygienic macros, object-oriented programming, a full featured cross-platform application framework, a sophisticated programmable IDE and a build system that creates binaries for Mac OS X, Windows and Linux. JazzScheme has been used for more than 10 years to develop high-quality commercial software. See http://www.jazzscheme.org/installation.htm for details on installing JazzScheme from its public Git repository. NEW IN 2.3 Kernel * Added -load option to load a specific module * Added -eval option to evaluate code after loading the kernel * Added -test option to run the validation suite of a product * Added -force option to the kernel that can be used with -compile * New crash handler that will output a backtrace when a crash occurs Build System * Static build of libraries * The Jazz kernel can now be built as a library * Build system is now fully scriptable * Added an option to build executables without including the Gambit compiler * Added new options to build without debug environments or debug location * Added parallel build support specified by jobs: number-of-jobs * Added a -link option (objects libraries all) to the build system Language * Module require/import/export are now special forms * Added a validation suite for Jazz * Added support for public / protected modules * Import conflicts are now detected * Major simplification and cleanup of everything related to literals * Added walk-time argument count validation * Implementated runtime library access of its exported symbols * All Jazz exception handling now fully supports scheme exceptions * Printing load stack in error message when cyclic dependencies occur * Added override modifier to methods overriding a base virtual method * Replaced function special-form with lambda in all modules * Now supporting slots in meta classes * Added initial support for type-safe enumerations Hygiene (many thanks to Alex Shinn) * Added support for hygienic macros using syntax-rules * Initial define-syntax support * Converted many macros to the new hygienic define-syntax Gambit * Added a new 'gambit' library that exports every Gambit procedure * Now cataloging Gambit's define-type-of- special form * Added an API to Gambit's structures and types * Added support for s8/u8/.../f32/f64 homogeneous vectors Framework * Every repository and package is now automatically an alias * Greatly improved load time of applications User Interface * Added support for merged cells in the tree view Cross-Platform * Many fix to X11 so it is now in a fairly usable state Libraries * Irregex - Ported Alex Shinn's Irregex library * Match - Ported Alex Shinn's Match library * Statprof - Added support for keeping a backtrace for each registered call * Added base64 module (from Gambit's examples) * Loading of a PNG image from a u8vector IDE * Catalogs are now automatically updated on save in a background thread * Regular expressions support in the multi-search/replace * Added a define-form macro enabling user forms to extend the IDE * Added basic arrow navigation in F8 * Added a new SQL workspace * Started a Showcase view to showcase available widgets * Launch time error now get reported after IDE has finished launching * Made mouse copy work accross views and in plain texts * Added Debug With... menu item to debug using any kernel (core, debug, ...) * Added full-screen functionality * Added register-user-completion(s) to user extend auto-completion * Directories search is now done in a background thread * Every text style can now be customized in the preferences. Have fun! * Started work on workspaces composed of independant OS windows Emacs * Added support for all basic emacs commands * Incremental search with highlight of every occurence found * Added c-x c-f find-file, c-x c-F find-filename and c-x b find-buffer * Adding M-y cyclic-paste behavior to emacs bindings * An experimental implementation of paredit is available Debugger * Major improvements to the remote debugger * Inspectors now work with remote REPLs * Added a Show Dynamic Environment button to the Variables pane * Added access to selected frame local variables in REPL evaluations * Started work on integrating Gambit's stepper in Jedi * Now binding debuggee's current-input/output-port to the debugger's console * The inspector can now inspect Gambit structures and types Designer * Started work on a full-fledged GUI designer Website * Added a new Hello World tutorial section * Added a FAQ ON THE HORIZON * Prototype-based programming * Static link of executables * Finish work on the GUI designer

1 0

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

Gambit-list Mars 2010