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Threading and TCP-SERVICE-REGISTER! (or, how to join on the service
by James Long 18 Nov '09

18 Nov '09

Hey guys, I've been working on some server code in Gambit. One of my projects uses TCP-SERVICE-REGISTER! to start a service. The problem with this is that when I go to run the program, Gambit doesn't wait for all threads to exit by default, so my program immediately exists. I've seen people add a (##repl-debug-main) call at the end of the script to keep the program going, but there are several IO issues with doing this. I would like to simply: * Tell Gambit to wait for all threads to exit before exiting OR * Get the thread for the tcp service and join on it OR * Write a function which joins on all threads The third option is a bit mysterious to me. I'm not sure how to get all threads safely, but here was an attempt. This is pseudo-code basically. The problem with this code is that threads may exit after I have put them into my list but before I call join on them. (define (thread-join-all!) (let* ((threads (vector->list (thread-group->thread-vector (thread-thread-group (current-thread)))))) (for-each (lambda (el) (if (not (eq? el (current-thread))) (thread-join! el))) threads))) What would be the best way to join on the threads created by TCP-SERVICE-REGISTER! ?

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Re: [gambit-list] Speed improvement of lib/digest.scm
by Marc Feeley 18 Nov '09

18 Nov '09

On 19-Feb-09, at 4:49 PM, Mikael More wrote: > Cool! > > Useful! > > What is the approx speed on your machine btw? > On my 2GHz Mac Book Pro: For MD5: 0.06 seconds per MB. For SHA-1: 0.13 seconds per MB. That's still about 3 times slower than the "md5" utility on my machine, but still not too bad for bit-bashing code entirely written in Scheme. Marc

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[ADMIN] - accessing list archive gives invalid certificate error
by Raffael Cavallaro 18 Nov '09

18 Nov '09

The mailing list archive: <https://mercure.iro.umontreal.ca/pipermail/gambit-list/> linked to from the main page of the wiki gives an error that the user is attempting a secure connection to a server with an invalid certificate. I receive this error in both Firefox and Sarari under Mac OS X 10.6.2. Configuration error or has someone hijacked this link... warmest regards, Ralph Raffael Cavallaro raffaelcavallaro(a)me.com

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Speed of u8vector-ref
by Alex Queiroz 16 Nov '09

16 Nov '09

Hallo, According to statprof, I am spending nearly 40% of my running time in lines which call 'board-ref', which is simply defined as: (define board-ref u8vector-ref) 'u8vector-ref' seems a pretty low-level call, so I can't see how this can be improved further. It is just a macro around '##u8vector-ref'. Maybe using it directly instead of 'board-ref'? Or is this probably a memory alignment issue? Cheers, -- -alex @asandroq http://www.ventonegro.org/

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Gambit-C 4.5.3 breaks blackhole import of compiled modules
by Nicola Archibald 16 Nov '09

16 Nov '09

Reported as an 'issue' on the blackhole tracker (http://github.com/pereckerdal/blackhole/issues/#issue/6) but I figured I'd copy it to the list in case anyone else was interested/being-affected, or on the offhand chance that this isn't a responsibility of blackhole to correct for a change in gambit... upgrading to 4.5.3 kills import dead in it's tracks whenever you have a module that uses the C FFI and thus requires compilation. As demonstrated below (only change is upgrade to 4.5.3 and re-build of 'build.scm'/removal of ns.dat) [nikki@vbox src]$ bsc Loaded Black Hole... Gambit v4.5.2 > (import test-c) /home/nikki/src/test-c is being compiled... > (c-print) Hello world > ===== [nikki@vbox src]$ bsc Loaded Black Hole... Gambit v4.5.3 > (import test-c) /home/nikki/src/test-c is being compiled... *** ERROR -- Operator is not a PROCEDURE (#("test-c.o1" ##2 <http://github.com/pereckerdal/blackhole/issues/#issue/2> | test-c.o1|>)) > At a guess, this is likely caused by something in the following commit : http://www.iro.umontreal.ca/~gambit/repo/.cgit.cgi/Gambit/commit/?id=5bae3c… <http://www.iro.umontreal.ca/%7Egambit/repo/.cgit.cgi/Gambit/commit/?id=5bae…>

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Use of ___USE_HANDLES in mem.c
by Nguyen Thai Ngoc Duy 16 Nov '09

16 Nov '09

Hi, Is ___USE_HANDLES for debugging purpose only? It seems to put more overhead on each data item for no (obvious) use. -- Duy

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built-in termite
by Derrell Piper 15 Nov '09

15 Nov '09

Hi, I'm trying to build a version of Gambit that has Termite built-in. I edited lib/_threads.scm and un-commented out the ';;(##include "termite/termite.scm")'. That mostly works, but it doesn't do whatever's necessary to import the Termite names into the default environment: fluffy:518% gsi Gambit v4.5.3 > (self) *** ERROR IN (console)(a)1.2 -- Unbound variable: self 1> ,t > termite#self #<procedure #2 termite#self> > (termite#self) #<thread #1 primordial> I can also compile things, but only if I explicitly qualify all the Termite identifiers with "termite#". What do I have to do to get the names imported? Thanks, Derrell

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syntax-case and define
by Derrell Piper 14 Nov '09

14 Nov '09

Lam Luu <luuxuanlam <at> gmail.com> writes: > I am trying to write some Scheme code, and I use define-syntax and > syntax-rules very heavily. However, whenever syntax-case.scm is > loaded/included, define special form does not work with #!key, > #!optional, and #!rest anymore. ##define, on the other hand, is not very > portable between Scheme implementation. I ran into this same problem a couple of months ago when I was porting a bunch of Common Lisp code to Scheme. I was really bummed when I realized I had to choose between these. I ended up going with Chicken for just this reason, though that's not without issues either. I do hope that the Gambit folks fix this. #!key is just too engrained if you're coming from Lisp. Derrell

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ssl server sockets
by Maarten Koopmans 14 Nov '09

14 Nov '09

Hi, Anybody know of somebody wrapping openssl in such a way that we can create ssl server sockets with Gambit? Or clients, SHA1.SHA256 , AES etc? Thanks, Maarten

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syntax-case and define
by Lam Luu 11 Nov '09

11 Nov '09

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everyone, I am trying to write some Scheme code, and I use define-syntax and syntax-rules very heavily. However, whenever syntax-case.scm is loaded/included, define special form does not work with #!key, #!optional, and #!rest anymore. ##define, on the other hand, is not very portable between Scheme implementation. Is there anyway to work around this situation? I have tried to put (namespace ("##" define)) in, but that produces no difference. Thank you, Lam Luu -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ iEYEARECAAYFAkr62M4ACgkQwnXdyzbwLCVFWgCfcBbJAr4UUKW/2IVrKPYlvSe7 mpMAnRNzWQfzR+66MRfl66Y12UY3FT7Z =KzQQ -----END PGP SIGNATURE-----

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