Gambit-list Septembre 2007

gambit-list@iro.umontreal.ca

25 participants
37 discussions

how to load snow package in gsi
by Quân Ta 11 Sep '07

11 Sep '07

Hi, It's probably something simple, but I just couldn't figure out. How can I load snow package into gambit interactive repl? Thanks, Quan

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Random random-integer?
by David St-Hilaire 11 Sep '07

11 Sep '07

Hi! I'm using the random-integer function, but it would seem that it always give the same set of results after each execution... I then guessed I had to set the random seed, somehow but I couldn't figure out the way to do it... I tried something like: (set! default-random-source (make-random-source)) (random-source-randomize! default-random-source) (pp (random-integer 10)) (pp (random-integer 10)) (pp (random-integer 10)) And tried to run it multiple times and I still get the same answer each time I run this simple program... :( What should be done to make this random? Shouldn't be that the default-random-source produce different random integers at each program launch?? Thanks! David

2 1

The Stochastic Pi-Machine
by Bradley Lucier 10 Sep '07

10 Sep '07

I'm wondering if Termite might have some connection with the Stochastic Pi-Machine, possibly as an implementation model. https://research.microsoft.com/~aphillip/spim/

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homepage not reachable ?
by Jerry van Dijk 10 Sep '07

10 Sep '07

Hi everyone, I am sorry that my first message to this list is not directly Gambit related, but I have been unable to reach the the homepage. Others report they can access the page OK, maybe someone on the list can check if there is a problem with e.g. my provider ? Thanks in advance and once again apologies for imposing this subject here. gr. Jerry. -- -- Jerry van Dijk -- Leiden, Holland -- -- The early bird may get the worm, but the second mouse gets the cheese!!

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termite exception propagation
by Phil Dawes 10 Sep '07

10 Sep '07

Hi Gambit List, (I'm not sure if this is the right forum to ask termite questions, apologies if not) My understanding from the termite paper is that linked processes propagate exceptions to exception catchers/handlers, and so I was expecting the following to return #t: (define (test-spawn-link) (with-exception-catcher (lambda (exception) #t) (lambda () (spawn-link (lambda () (raise 'dying))) (? 5) #f) )) (init) (test-spawn-link) However this returns #f, indicating that the handler isn't called. Moreover the value of the exception is returned by the receiver (? 5). Am I missing something or has this behaviour changed since the paper? Also, is there anywhere else to get documentation for termite? (tested on gambit 4b22 and 4.0.0) Many thanks, Phil

3 4

Debugging Gambit w Snow
by andrew cooke 09 Sep '07

09 Sep '07

Hi, I'm developing a bunch of packages using Snow and Gambit and really need some help with debugging. I am using generic Snow scripts as defined in the documentation. Is there some way of using an interactive prompt (at this point I have quite a lot of interdependent packages if that makes any difference)? Alternatively, is there some way to enable stack traces? Or anything similar? For example, at the moment I see: qp6 lines: SNOW_TEST="lines-base" ./lines-base.scm *** ERROR IN #<procedure #2>, "../../../pkg/gambc-4.0b22/4.0b22/syntax-case.scm"@9169.1 -- no expressions in body (lambda (#(#(source1) first "/home/andrew/projects/personal/src/scheme/lines... and I have no idea what part of my code that might be related to. I probably just need to be pointed at the appropriate documentation - I looked on the Snow site, but it seems to imply that I need to read a Gambit-specific section that doesn't exist(?). Thanks! Andrew

2 1

Text Template
by jonnay＠jonnay.net 08 Sep '07

08 Sep '07

Hey guys. I just finished porting over Nikita Sidorov's Text Template. Its a pretty neat little package. I plan on using it with my web + application server. You can download the gambit port here: http://www.bunny.jonnay.net/zengarden/trunk/lib/text-template/

3 3

Limiting object external representation
by Marc Feeley 06 Sep '07

06 Sep '07

Some users of Gambit have experienced problems using the REPL to debug programs which create circular structures because the external representation used by default by "write", "pretty-print", and "pp" does not handle circular structures or deeply nested structures very well (i.e. infinite loop). This issue can be addressed by changing the readtable associated with the REPL's output port. This can be done with code such as: (define (repl-ctrl sharing-allowed? max-write-level max-write-length) (let ((port (repl-output-port))) (output-port-readtable-set! port (let* ((rt (output-port-readtable port)) (rt (readtable-sharing-allowed?-set rt sharing-allowed?)) (rt (readtable-max-write-level-set rt max-write-level)) (rt (readtable-max-write-length-set rt max-write-length))) rt)))) (repl-ctrl #t 2 5) It is convenient to place this code in the ~/gambcini.scm file so that it does not have to be entered each time gsi is invoked. The above code will use the SRFI 38 syntax for shared/circular structures. It will also stop printing parts of a structure that are beyond a nesting level of 2, or beyond a length of 5 (using an elipsis instead). Marc

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Compiled thread debugging?
by David St-Hilaire 05 Sep '07

05 Sep '07

Hi all! I'm currently experiencing a problem regarding thread debugging in some compiled code. I have a thread which seems to die for some unknown reasons (which I'd like to find out) but since it is compiled code, I don't have access to gambit's debugging facilities such as a backtrace of the execution. Is there a way to get that info even with compiled code? I cannot use 'gsi' with my code because it uses gambit's FFI (and gsi does not support the FFI)... Thank you! David

2 4

Newbie question.
by Arthur Smyles 05 Sep '07

05 Sep '07

Hi all, I'm trying to compile a simple program and am having a weird syntax error that I can't figure out. It seems to follow the example code for c-lambda but i get the error: libcurl.scm: *** ERROR IN | syntax-case.o1| -- invalid syntax () I'm attaching my example files as well as inlining them here: (c-declare "#include \"curl.h\";") (c-initialize "curl_global_init (CURL_GLOBAL_ALL);") (define curl-version (c-lambda () char-string "curl_version")) The command that I'm compiling with is gsc -link libcurl.scm test.scm BTW, I'm using gambit 4.0.0 Thanks Arthur (print (curl-version)) (c-declare "#include \"curl.h\";") (c-initialize "curl_global_init (CURL_GLOBAL_ALL);") (define curl-version (c-lambda () char-string "curl_version"))

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Gambit-list Septembre 2007