Février 2007 - Gambit-list - mailman.iro.umontreal.ca

good language for real time application?
by Vincent 08 Fév '07

08 Fév '07

Hello, I want to write a router with real time performance. I am trying to find the best language to use for it, and would like to use a functional language if possible. Erlang might work, but I want to distribute the router incorporated into a Linux live boot CD, so I think that maybe whatever I distribute has to be GPL compatible. I don't know if I can distribute the Erlang runtime with that license condition. I tried to join the Erlang questions list to ask about that, but so far have not been able to join the list. Is Gambit Scheme suitable for real time applications? Does it have a real time garbage collector? Vincent ____________________________________________________________________________________ Finding fabulous fares is fun. Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains. http://farechase.yahoo.com/promo-generic-14795097

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Re: [gambit-list] Passing lambdas as callbacks to C functions
by schemeway＠sympatico.ca 05 Fév '07

05 Fév '07

Phil, >> I ran into problems using lambda expressions as callbacks when wrapping >> libcsv and I've boiled it down to this testcase. Can anybody tell me why >> this crashes?: >... >> looper is a c function which takes a scheme lambda and repeated invokes >> it using the 'call_lambda' bridging function. >> >> When I gsc compile it and run '(main)' after a bunch of looping and >> printing it crashes with: >> ERROR IN looper -- Operator is not a PROCEDURE >> ('#<return #2>) >> >> Any ideas? (or am I being stupid?!) > I'm just guessing here, but could it be that, since your lambda > expression is not reference anywhere else in your Scheme code, it > gets GC'd? I'm not so sure about my diagnostic anymore... I've able to reproduce your problem and it only shows up when started from the OS shell. If I first load your (compiled) code in gsi and then evaluate '(main)', I don't get the problem at all. That's strange... Marc, any idea? Dominique

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Re: [gambit-list] Passing lambdas as callbacks to C functions
by schemeway＠sympatico.ca 05 Fév '07

05 Fév '07

Phil, > I ran into problems using lambda expressions as callbacks when wrapping > libcsv and I've boiled it down to this testcase. Can anybody tell me why > this crashes?: >... > looper is a c function which takes a scheme lambda and repeated invokes > it using the 'call_lambda' bridging function. > > When I gsc compile it and run '(main)' after a bunch of looping and > printing it crashes with: > ERROR IN looper -- Operator is not a PROCEDURE > ('#<return #2>) > > Any ideas? (or am I being stupid?!) I'm just guessing here, but could it be that, since your lambda expression is not reference anywhere else in your Scheme code, it gets GC'd? Dominique

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Gambit-compatible libraries
by Levi Pearson 04 Fév '07

04 Fév '07

Looking through the archives, I found a couple of references to efforts various people made to port SRFIs and other libraries to Gambit. I found Guillaume Germain's initial release of SRFIs, but there never seemed to be any followup releases. SLIB apparently worked with Gambit 3.0, but does anyone know if it works with recent versions? Also, what is the Scheme Now! project and how will it be related to Gambit? I waited with much anticipation throughout December, but alas, I was disappointed. --Levi

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large files
by mb 03 Fév '07

03 Fév '07

hi, i coded a simple and stupid directory walker; however it stopped when scanning a file with a size > 4GB. After fiddling around a little i noticed that stat() fails an my system with files > 2GB unless one explicitly asks to use 64bit file offsets. So i had to add this define #define __USE_FILE_OFFSET64 to the os.h header and recompile gambit. This enforces that a call to stat is a call to stat64 under the hood. Also, this has some implications to the size of the struct 'stat' and various other os dependent file operations. I'm wondering if a check against the usage of 64bit file offsets etc should be added to the ./configure system? Did i something wrong while configuring gambit, or this issue already known? greets -alex

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Passing lambdas as callbacks to C functions
by Phil Dawes 03 Fév '07

03 Fév '07

Hi Marc, Hi Gambit List, I ran into problems using lambda expressions as callbacks when wrapping libcsv and I've boiled it down to this testcase. Can anybody tell me why this crashes?: ------- (c-define (call-lambda l) (scheme-object) void "call_lambda" "" (l)) (define looper (c-lambda (scheme-object) void #<<c-lambda-end while(1){ call_lambda(___ARG1); } c-lambda-end )) (define (main) (looper (lambda () (write "foo")))) -------- looper is a c function which takes a scheme lambda and repeated invokes it using the 'call_lambda' bridging function. When I gsc compile it and run '(main)' after a bunch of looping and printing it crashes with: ERROR IN looper -- Operator is not a PROCEDURE ('#<return #2>) Any ideas? (or am I being stupid?!) Many thanks, Phil

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Using Gambit Scheme on UNIX, question
by urrozalf＠vcn.bc.ca 02 Fév '07

02 Fév '07

Hello there, this is my first message. I am trying to run Gambit on my UNIX box, is an old machine just 250 MHz. I am running Solaris 9, I downloaded the "*.tar.gz" file, expanded it. Then using terminal I issued the command "tar xvf ****.tar", it worked fine. I have the Gambit directory on "/export/home/alfonso/MySoftware/Gambit***" Then I issued the command /.configure it worked fine, I think, now I don't know what is the next step, so I can start using Gambit. Any help will be appreciated. Thanks. Alfonso

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