Gambit-list Novembre 2010

gambit-list@iro.umontreal.ca

23 participants
22 discussions

Edge triggered I/O with libevent
by Adam Langley 04 Avr '13

04 Avr '13

Gambit uses the select call on POSIX systems to multiplex IO operations. This is fine for small numbers of file descriptors, but falls apart quickly with large numbers[1]. libevent[2] is a wrapper library around a number of modern IO multiplexing systems (epoll on Linux, kqueue on the BSDs as well as poll and select). Attached is a patch which converts Gambit to using edge triggered I/O with epoll and libevent. This also requires a patch (attached) of libevent since the standard distribution doesn't include edge triggering support and the upstream appears to be on holiday. (epoll is required because I don't have a BSD box on which to develop edge triggering support for kqueue) This patch (for Gambit) preprocesses away to nothing unless --enable-libevent is passed to the configure script. (Note that, since this patches the configure.ac script, you'll need to run autoconf to regenerate). I hope I've not broken anything, but at this stage I've only tested that the console and tcp ports work. This patch (in the future) should also allow people, who write programs which use socket calls directly, to integrate into the main event loop at some point. Testing is more than welcome and, if you find a form of IO which is broken, please email me. [1] http://monkey.org/~provos/libevent/libevent-benchmark2.jpg [2] http://monkey.org/~provos/libevent/ -- Adam Langley agl(a)imperialviolet.org http://www.imperialviolet.org (+44) (0)7906 332512 PGP: 9113 256A CC0F 71A6 4C84 5087 CDA5 52DF 2CB6 3D60

2 2

How to pass a u8vector to the FFI
by Mikael 20 Sep '11

20 Sep '11

You do this, by declaring the passed u8vector as a scheme-object in the c-lambda definition. The memory pointer to the u8vector's contents in the C code is resolved by void *u8vectorptr = ___CAST(void*,&___FETCH_U8(___BODY(theu8vectorschemeobjectvariable),___INT(0))); Remember that the pointer is only to be kept until the next return to Scheme. Mikael 2010/3/30 Álvaro Castro-Castilla <alvaro.castro.castilla(a)gmail.com> > Hi! > > Is there a way to pass a u8-vector to a FFI interface somehow? > The way I expect this to work is through a (pointer unsigned-char), but it > obviously doesn't work, claiming a proper C pointer. I would like to be able > to build this arrays from Scheme code. Is there a way? > > Currently I have to call a FFI function to set char by char, calling the > c-lambda function too many times. > > One thing that could work is something that converts u8-vectors to unsigned > char* arrays, does that exist in Gambit? > > > Thanks, > > Álvaro > > _______________________________________________ > Gambit-list mailing list > Gambit-list(a)iro.umontreal.ca > https://webmail.iro.umontreal.ca/mailman/listinfo/gambit-list > >

6 10

cmake for projects written in gambit?
by Matthew Koichi Grimes 06 Avr '11

06 Avr '11

Has anybody used CMake as a build system for their Gambit projects? I'm not talking about building Gambit itself, but rather building projects that are written in Gambit. If so, could I see your CMakeList bulid files? I would also be interested in other build systems' makefiles (make, ant, etc), if people are wiling to share, or point me to an open-source project written in Gambit that I could download. Best, -- Matt

2 4

Deadlock when using net/http-client
by Tim Lavoie 02 Déc '10

02 Déc '10

Greetings, I'll start off with a caveat: I'm new to Gambit and add-ons such as Black Hole, but have been exploring and having a good time so far. One of the modules I would like to make use of is net/http-client, so that I can use Gambit-C to fetch data from CouchDB. I believe I have everything installed OK, but I receive immediate deadlock errors when attempting to make a request. (Any request, URL doesn't matter.) I have appended the request, error and stack dump below; please let me know if I'm doing something wrong, or have stumbled onto a bug. Thanks, Tim > (http-get-url "http://localhost:5000/") *** ERROR IN ##thread-deadlock-action! -- Deadlock detected 1> ,bed 0 ##thread-deadlock-action! (current-exception-handler) = primordial-exception-handler (current-input-port) = '#<input-port #9 (stdin)> (current-output-port) = '#<output-port #10 (stdout)> (current-directory) = "/home/tim/prog/scheme/" 1 ##mutex-lock-out-of-line! (current-exception-handler) = primordial-exception-handler (current-input-port) = '#<input-port #9 (stdin)> (current-output-port) = '#<output-port #10 (stdout)> (current-directory) = "/home/tim/prog/scheme/" 2 call-with-output-u8vector (current-exception-handler) = primordial-exception-handler (current-input-port) = '#<input-port #9 (stdin)> (current-output-port) = '#<output-port #10 (stdout)> (current-directory) = "/home/tim/prog/scheme/" 3 http-client#http-access-url "../../dl/Scheme/Gambit/Blackhole/blackhole/std/net/http-client.scm"@1005:1 12#headers = '() 11#response-headers = #f 10#response-code = #f 9#mtx = '#<mutex #12> 8#up = '#<output-port #13 (u8vector)> 1#method = 'get 2#uri = "http://localhost:5000/" 3#http-username = #f 4#http-password = #f 5#headers = '() 6#follow = #t 7#query = #f (current-exception-handler) = primordial-exception-handler (current-input-port) = '#<input-port #9 (stdin)> (current-output-port) = '#<output-port #10 (stdout)> (current-directory) = "/home/tim/prog/scheme/" 4 (interaction) "(generated)"@1:1 (http-client#http-get-url... (current-exception-handler) = primordial-exception-handler (current-input-port) = '#<input-port #9 (stdin)> (current-output-port) = '#<output-port #10 (stdout)> (current-directory) = "/home/tim/prog/scheme/"

6 8

gsc doesn't recognize -exe option?
by Matthew Koichi Grimes 30 Nov '10

30 Nov '10

I'm trying to compile a trivial program, using gsc 4.2.8 on Ubuntu 10.04. My source file is named hello.ss, and contains one line: (display "hello") I try to compile it with this command: $ gsc -exe hello.ss I get the following error: *** WARNING -- Unknown or improperly placed option: "exe" It runs fine under the interpreter if I type "gsi hello.ss", and if I omit the -exe and just type "gsc hello.ss", it compiles to an object file, as expected. So I don't think that Ubuntu's Gambit installation is bad... Any ideas on what's going on would be greatly appreciated. -- Matt

4 4

failure building r6gambit
by Marco Maggi 29 Nov '10

29 Nov '10

Ciao, I have Gambit-C 4.6.0 installed on a i686-pc-linux-gnu along with GCC 4.5.1, and it can successfully compile simple programs; I am no expert of Gambit. When trying to build r6gambit from the tarball at: http://smyles.com/projects/r6gambit.tar.gz I get the following error: $ gsc-script -i compile generating r6rs. creating stage compiling /home/marco/var/build/devel/r6gambit/srfi-1-min.scm compiling /home/marco/var/build/devel/r6gambit/srfi-99.scm compiling /home/marco/var/build/devel/r6gambit/error.scm compiling /home/marco/var/build/devel/r6gambit/srfi-69.scm compiling /home/marco/var/build/devel/r6gambit/uri.scm compiling /home/marco/var/build/devel/r6gambit/catalog.scm compiling /home/marco/var/build/devel/r6gambit/compat-gambit.scm compiling /home/marco/var/build/devel/r6gambit/runtime.scm compiling /home/marco/var/build/devel/r6gambit/srfi-66.scm loading stage... create play compiling /tmp/r6rs-expand-1291024639/core.exp compiling /tmp/r6rs-expand-1291024639/expander.exp compiling /home/marco/var/build/devel/r6gambit/primitives.scm linking (/tmp/r6rs-expand-1291024639/srfi-1-min /tmp/r6rs-expand-1291024639/srfi-99 /tmp/r6rs-expand-1291024639/error /tmp/r6rs-expand-1291024639/srfi-69 /tmp/r6rs-expand-1291024639/uri /tmp/r6rs-expand-1291024639/catalog /tmp/r6rs-expand-1291024639/compat-gambit /tmp/r6rs-expand-1291024639/runtime /tmp/r6rs-expand-1291024639/srfi-66 /tmp/r6rs-expand-1291024639/core /tmp/r6rs-expand-1291024639/expander /tmp/r6rs-expand-1291024639/primitives) generating-library ... gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory done is there a fix for this? TIA -- Marco Maggi

4 7

Re: [gambit-list] failure building r6gambit
by Marco Maggi 29 Nov '10

29 Nov '10

"Bradley Lucier" wrote: > OK, thanks, now I end with > > /pkgs/gcc-4.5.1/bin/gcc [...] > collect2: cannot find 'ld' If you do a search for this error message you will find a number of discussions about its possible origin. Are you actually able to compile and link a plain C source file? Yours may not be a Gambit-related problem... -- Marco Maggi

2 2

Re: [gambit-list] failure building r6gambit
by Marco Maggi 29 Nov '10

29 Nov '10

"Marc Feeley" wrote: > It will also help to do > > % export GAMBC_CC_VERBOSE=1 Ugh, I do not see any difference in the output. ~/var/build/devel/r6gambit $ export GAMBC_CC_VERBOSE=1 ~/var/build/devel/r6gambit $ echo $GAMBC_CC_VERBOSE 1 ~/var/build/devel/r6gambit $ gsc-script -i compile generating r6rs. creating stage compiling /home/marco/var/build/devel/r6gambit/srfi-1-min.scm compiling /home/marco/var/build/devel/r6gambit/srfi-99.scm compiling /home/marco/var/build/devel/r6gambit/error.scm compiling /home/marco/var/build/devel/r6gambit/srfi-69.scm compiling /home/marco/var/build/devel/r6gambit/uri.scm compiling /home/marco/var/build/devel/r6gambit/catalog.scm compiling /home/marco/var/build/devel/r6gambit/compat-gambit.scm compiling /home/marco/var/build/devel/r6gambit/runtime.scm compiling /home/marco/var/build/devel/r6gambit/srfi-66.scm loading stage... create play compiling /tmp/r6rs-expand-1291059929/core.exp compiling /tmp/r6rs-expand-1291059929/expander.exp compiling /home/marco/var/build/devel/r6gambit/primitives.scm linking (/tmp/r6rs-expand-1291059929/srfi-1-min /tmp/r6rs-expand-1291059929/srfi-99 /tmp/r6rs-expand-1291059929/error /tmp/r6rs-expand-1291059929/srfi-69 /tmp/r6rs-expand-1291059929/uri /tmp/r6rs-expand-1291059929/catalog /tmp/r6rs-expand-1291059929/compat-gambit /tmp/r6rs-expand-1291059929/runtime /tmp/r6rs-expand-1291059929/srfi-66 /tmp/r6rs-expand-1291059929/core /tmp/r6rs-expand-1291059929/expander /tmp/r6rs-expand-1291059929/primitives) generating-library ... gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory gcc: error trying to exec 'cc1': execvp: No such file or directory done -- Marco Maggi

1 0

Re: [gambit-list] failure building r6gambit
by Marco Maggi 29 Nov '10

29 Nov '10

"Jeremie Lasalle Ratelle" wrote: >Is gcc installed? > > http://ubuntuforums.org/showthread.php?t=540541 Yes it is installed and running fine; I installed GCC from source and I have: $ ls -l /usr/local/libexec/gcc/i686-pc-linux-gnu/4.5.1/cc1 -rwxr-xr-x 1 root root 36M 2010-11-15 13:04 /usr/local/libexec/gcc/i686-pc-linux-gnu/4.5.1/cc1 (and I am running Slackware). -- Marco Maggi

1 0

Thanks for Gambit
by Mikael 26 Nov '10

26 Nov '10

Thanks for Gambit, Marc! Happy thanksgiving! Mikael

3 2

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

Gambit-list Novembre 2010