Gambit-list Juin 2009

gambit-list@iro.umontreal.ca

29 participants
47 discussions

Employment opportunities in Gambit / JazzScheme
by Guillaume Cartier 27 Jui '09

27 Jui '09

Hi everyone, Auphelia Technologies is looking for highly skilled resources for work in Gambit / JazzScheme, Web development and Database architecture. Auphelia Technologies offers integrated management software, entirely customized for small and medium-sized businesses, using innovative technology and revolutionary features. Auphelia is located in Montreal, Canada. See http://www.auphelia.com (under construction). Gambit is a complete, portable, efficient and reliable implementation of the Scheme programming language. See http://dynamo.iro.umontreal.ca/~gambit. JazzScheme is an open source programming language and cross-platform framework built on top of Gambit . It includes a sophisticated IDE and has been used for more than 10 years to develop high-quality commercial software. See http://www.jazzscheme.org. DESCRIPTION OF THE PROJECT We are starting development on a new Enterprise Resource Planning (ERP) software that we plan on making top of its class. Work will be a complete rewrite and a major evolution of an existing product already in use by a large client base. Note that this project is a highly complex undertaking as we will not be developing just another ERP software but a complete dynamic ERP creation platform. Project is planned to last around 1 1/2 year for the first release. Current team is composed of 10 people and is planned to grow to around 25. TECHNOLOGIES After an exhaustive evaluation period, decision has been made to develop the backend entirely in Gambit / JazzScheme. We still haven't decided between Qt and JazzScheme for our desktop client solution but if the JazzScheme platform can be evolved to suit our needs, we have a definite preference for using it accross the whole project. EMPLOYMENT OPPORTUNITIES We need resources for the following 4 positions : LANGUAGE / FRAMEWORK DEVELOPPER 1 or 2 resources to work closely with Gambit and JazzScheme's authors to evolve the JazzScheme langage and framework during a period of about 6 months. Planned work includes : - Language - Module / build system - Performance / memory - IDE / Remote debugger - X11 and MacOS X frontends Note that Gambit's author Marc Feeley, has confirmed his participation part time in the project! Ideally, the resources we are looking for would have expert knowledge in Lisp, Scheme, Gambit and JazzScheme! But realisticaly, if you don't know those but are brilliant, motivated and want to be part of an exciting project that could put Scheme to the forefront, please send us your resume! PROJECT DEVELOPPER 1 or 2 resources to complete our existing team and work on the Desktop client and / or Server layer. Knowledge of the following is a definite plus : - Lisp, Scheme, Gambit, JazzScheme - GUI development - Highly scalable server development - Databases, SQL WEB DEVELOPPER 1 resource to work on the Web client. We need a world class expert in advanced web interfaces as the Web client will have to implement all the functionality of the Desktop client. Knowledge of the following is critical : - Dynamic web development with AJAX - Advanced web interfaces - Javascript - PHP DATABASE ARCHITECT 1 resource to be lead in every database related work. Knowledge of the following is critical : - World class expertise in database modeling - Databases : PostgreSQL (will probably be the first one supported), Oracle, SQLite (for the offline mode) Ideally we are looking for full time resources located near Montreal but are definitely open to remote work and other options. Auphelia Technologies offers competitive & flexible employment conditions. PS: Please feel free to pass this announce to your friends! Cheers, Guillaume Cartier gc(a)auphelia.com

2 1

file local defines
by lowly coder 26 Jui '09

26 Jui '09

; foo.scm (magical-define x 100) ; bar.scm (define y (+ x 10)) ; ; all.scm (load "foo") (load "bar") ; <-- I want this here to be a syntax error Is there a way I make defines/variables _local_ to a single *.scm file? I promise to not 'include it, and only 'load it. In essence, I'm looking for the equiv of static vars in C. What I don't want to do is something like: ;foo .scm (lambda () ... all of foo.scm ) ; ... since there are other parts of foo.scm that I do want to be visible. Yes, I do realize that what I'm asking for sounds like the basics of a module system. Thanks!

2 1

gsi behaves differently from gsi -:s
by Marijn Schouten (hkBst) 26 Jui '09

26 Jui '09

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, $ gsi Gambit v4.4.3 > (let ((else #f)) (cond (else #t))) #t > (let ((else #f)) (cond (else #f) (#t #t))) *** ERROR IN (console)(a)2.24 -- Else clause must be last ============================ $ gsi -:s Gambit v4.4.3 > (let ((else #f)) (cond (else #t))) > (let ((else #f)) (cond (else #f) (#t #t))) #t > Marijn - -- If you cannot read my mind, then listen to what I say. Marijn Schouten (hkBst), Gentoo Lisp project, Gentoo ML <http://www.gentoo.org/proj/en/lisp/>, #gentoo-{lisp,ml} on FreeNode -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkpEpqwACgkQp/VmCx0OL2xXsQCffn2yMAVzYmSZtePwemP2qLe4 1EMAnikw/JkfiRzODOeQk44Yt7iSWz+f =euz6 -----END PGP SIGNATURE-----

1 0

load -> re-compile if out of date
by lowly coder 23 Jui '09

23 Jui '09

A common problem I'm recently having is: foo.scm <-- contais c-define-type --> compiles to foo.o1 Some other code says (load "foo") Now, something changes (mostly a git thing) and foo.scm 's timestamp changed, and my code compalins taht c-define-type can't be used in interpreted mode. Is there a gambit command for "recompile this if out of date, with options XYZ"? Thanks!

2 1

Garbage Collection BlackMagic
by lowly coder 23 Jui '09

23 Jui '09

Maybe the right answer is "Don't do this in Gambit", but I'd like to give it a try: I'm writing an application, in Gambit. It does OpenGL graphics. It runs at 100fps. It's interpreted. Now, put down the pitch fork -- the only thing it's doing at 100Hz is for 20 different objects glLoadIdentity glPushMatrix some rotation glCallList glPopMatrix This works fine, _except_ when I get hit with a gambit gc, it costs me like 70ms ... which becomes a noticable lag in my otherwise smoothly rotationg screen. What are my options? Can I get a thread local heap? My basic usage is the following: launch gambit app --> it opens up a glut window --> it listens on port ABCDE for new graphics primitives in my editor window, I type some code; I send new primitives to port ABCDE; my gambit app spends a bit of time building it into a new display list That's all. What can I do in this particular situation? Thanks!

3 7

dumb question: outputting in hex format
by lowly coder 22 Jui '09

22 Jui '09

I know that #xdeadbeef lets me input in hex, but is there something like C's fprintf(stderr, "%x"); ? Thanks!

2 1

web-repl.scm / concurrent read/writes
by lowly coder 22 Jui '09

22 Jui '09

Looking at the web-repl.scm file in gambc/examples, I often see situations of: lock mutex write single char flush output unlock mutex Why is this necessary? According to the gambit documentation, ports have to be written to handle concurrent read/writes themselves. Thanks!

2 2

calling scheme from C
by Aditya Godbole 22 Jui '09

22 Jui '09

Hi, I'm trying to call functions written in scheme from C. I saw the server.scm and client.c as mentioned in docs, but I could not quite understand what it was doing. I also could not successfully link the application. Where can I find documentation for the ___setup function and the steps for compiling such a program? TIA. Aditya.

8 17

defining my own input/output ports
by lowly coder 22 Jui '09

22 Jui '09

As I get more familiar with Gambit, I find it's notion of ports to be really really useful. However, I don't know how to create these structures myself. Can someone point me to some sample code? A really great example would be something like: (define-type tagged-data tag data) then, as a piece of data is written to the output port, it's tagged with a (increasing number), and when it's read off the input port, it's a piece of tagged data so ssuppose I wrote 'a 'b 'c 'd 'e to the port then when I read from it, I get back (make-tagged-data 1 'a) (make-tagged-data 2 'b) ... (make-tagged-data 5 'e) The point of this isn't this particular problem, but to understand what abstractions I need to provide when writing my own ports. Thanks!

2 1

problem with gsc and .gambcini
by Aditya Godbole 22 Jui '09

22 Jui '09

Hi, I'm getting some quirky behaviour with gsc and .gambcini, in which I am initialising the black hole system. [ffi]$ cat server.scm (c-define (add-two n) (int) int "add_two" "extern" (+ 2 n)) [ffi]$ cat ~/.gambcini (load "~~/lib/modules/build") [ffi]$ gsc server.scm *** ERROR IN "/home/aditya/prog/scheme/ffi/server.scm"@1.24 -- Undefined C type identifier Now if I comment out the (load ...) in .gambcini and put a line in server.scm - [ffi]$ cat server.scm (load "~~/lib/modules/build") (c-define (add-two n) (int) int "add_two" "extern" (+ 2 n)) [ffi]$ cat /home/aditya/.gambcini ;(load "~~/lib/modules/build") [ffi]$ gsc server.scm [ffi]$ which works without problems. I am using gambit v4.4.3 Can someone please explain why this happens? -aditya

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Gambit-list Juin 2009