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Re: [gambit-list] Strange Gambit error problems DS
by Marc Feeley 31 Oct '06

31 Oct '06

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 25-Oct-06, at 4:48 AM, Andrew Lentvorski wrote: > Marc Feeley wrote: > >> For the threading system to work, you will need a heartbeat >> interrupt (complete the implementation of >> setup_heartbeat_interrupt_handling and friends in lib/os_time.c) > > I've been trying to model my heartbeat code after the > USE_dos_setvect_1Ch code. However, I have two questions: > > 1) How do I notify Gambit that a heartbeat has fired? > > I looked at the dos_setvect stuff, but I don't see anything which > does the actual notifcation. I don't have signals available that I > know of, so that's out. Presumably I need to set a semaphore > somewhere and Gambit will eventually see that a heartbeat has > fired, but where? You have to call ___time_mod.heartbeat_interrupt_handler() . This function is set when ___setup_time_module(heartbeat_intr) is called in lib/os.c . The function heartbeat_intr calls ___raise_interrupt (___INTR_HEARTBEAT) which raises a flag that is detected by the Scheme code through polling (see my paper "Polling efficiently on stock hardware", http://www.iro.umontreal.ca/~feeley/papers/ polling.ps.gz). > > 2) How do I test that I have the heartbeat system working? > > Thanks, > -a (##heartbeat-interval-set! 1.0) (##interrupt-vector-set! 1 (lambda () (display "*"))) (let loop () (loop)) By the way, contrary to what I said earlier, the heartbeat interrupts are not necessary for the thread system to work. However, they are needed for preemptive threads. You need a complete implementation of the ___time_get_current_time function in lib/os_time.c if you want the timed operations to work (thread-sleep!, timeouts, etc). Marc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (Darwin) iD8DBQFFP0t1//V9Zc2T/v4RAgz4AKCdUsk4SAHxnqnVb2lXoA+KrIAYZQCgsgaa U25WOjOb4dVKu6TqMFZ/B10= =qm9t -----END PGP SIGNATURE-----

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will objects around immediate objects won't deallocate
by Christian 30 Oct '06

30 Oct '06

Hello I've noticed that calling make-will on some immediate object will not give an error (which is probably a good thing), but then never get deallocated. > (make-will 1234 (lambda (v) (display (list "will:" v "\n")))) #<will #2> > (##gc) > (##gc) > #2 #<will #2> Not sure whether that's a bug and what the right thing would be (I've not run into this in real code). Wills around bignums work as expected, so if people are using that on numbers without checking whether the number is heap allocated, they will get a leak in the fixnum case. Maybe the best solution is to return #f when calling make-will on immediate objects. Cheers Christian.

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Gcc options
by Bradley Lucier 29 Oct '06

29 Oct '06

Marc: I can't compile Meroon on darwin-ppc (I require more then 2GB of memory) with gcc after configuring gambit with the configure line env CC='gcc -mcpu=970 -m64' ./configure I could use an option to pull back the gcc compiler options to what they were before beta 20. Also, you make the default compiler options pretty fancy now, but still -D___SINGLE_HOST is not the default. I'm wondering whether the default should be the previous set of compiler options and --enable- single-host. I think this would probably still give the best set of default options for both gcc and gsc. Brad

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Good code snippets for debugging networking?
by Andrew Lentvorski 27 Oct '06

27 Oct '06

Anybody have some nice, small code snippets that I can use for debugging the networking layer. Other stuff like web-repl.scm would be really useful. web-repl.scm is good because I can run it a a single, self-contained file and I can use telnet on the other side to test. Similar things which would need sock (sorta like telnet, but works with the raw socket API a lot closer. It's from the Unix Network Programming book by Stevens) are also welcome. Thanks, -a

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Gambit Licensing
by Guillaume Cartier 27 Oct '06

27 Oct '06

Hi everyone, I was wondering. As Gambit uses GCC, isn't Gambit's licensing bound to be GPL or at least LGPL? Also, isn't anyone using Gambit, as Gambit indirectly uses GCC bound to be GPL too? Any comments on these issues, really appreciated. The more I look into Open Source licensing, the more confused I get. Guillaume Cartier

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Write to console from inside _gsi.scm?
by Andrew Lentvorski 25 Oct '06

25 Oct '06

How do I write out to the console from _gsi.scm? I presume that I need to just specify the correct stream? What would that be at that point? If I do a (write "FOO!") inside _gsi.scm, it seems to get eaten. Similarly, it gets eaten if I specify it in main() inside _gsi.scm. I can do a write from inside _repl.scm as it seems to set things up before that as well as provides me with an available stream to write to. Thanks, -a

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Strange Gambit error problems DS
by Andrew Lentvorski 25 Oct '06

25 Oct '06

Okay, I have reverted most of my changes and just left the minimal amount required to keep Gambit working on the DS. The repl is still broken, but it's very strange. I'm wondering if this is some form of endianness/type size failure due to the cross compile: Gambit Version 4.0 beta 20 > 0 3 > 1 2 > 2 1 > 3 0 > 4 7 > 5 6 > 6 5 > 7 4 > 8 *** ERROR IN (console)(a)9.1 -- Unbound variable: 8 1> Any ideas? Thanks, -a

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Gambit and termite on an embedded system (Nintendo DS)?
by Andrew Lentvorski 23 Oct '06

23 Oct '06

I'd like to have a Gambit repl on an embedded system (Nintendo DS). I'm tired of not having a real language to program the thing. :) The primary constraint is 4MB of working RAM. A second constraint would be to have the repl over a socket (I looked at web-repl, so that doesn't look to be much of a problem). I can access files from external compact flash storage, but I would prefer to limit that as much as possible. I took a quick trip over to gmane to search the archives to see if someone else has tried this, but nothing obvious came up. I figured I'd ask for some pointers before running blindly down the wrong path. I'd also like to be running termite on this, eventually. However, I figure that I'm going to have enough issues without complicating my life like that at the start. Any pointers/advice would be deeply appreciated. Thanks, -a

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Gambit installation on Windows
by Guillaume Cartier 23 Oct '06

23 Oct '06

Hi, I just downloaded Gambit 4.0b20 from the website, both the source and also the prebuilt installation for Microsoft Windows. What I don't understand is that they contain directories with different names: - gambc-4.0b20 for the source and - Gambit-C/4.0b20 for the Windows prebuild So should I keep them separate and get a hierarchy like this under C:\ - Gambit-C - 4.0b20 - gambc-4.0b20 Or should I merge them and then what is the preferred name to use? 4.0b20 or gambc-4.0b20. Thanks Guillaume Cartier

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Questions about emacs gambit.el
by Jeff Wood 22 Oct '06

22 Oct '06

I went looking around the internet and couldn't find a good answer so, I figure asking the list is about the best place to start ... I went through the documentation and set up my .emacs file to have the correct stuff to use gambit. So, when I have the buffer ... I try using C-c C-c and get back "unbound variable: compile" when I try to use the in-emacs scheme window ( m-x run-scheme ) and do a (define (square x) (* x x)) I get back ill-placed define ... what additional information can I provide to help get things all better. ?? Thanks, in advance for your time. jd

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