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

Showing optimized code expansions
by Lassi Kortela 24 Jan '20

24 Jan '20

`gsc -expansion foo.scm` is really nice. Is there a way to show the same expansion from within the `gsc` REPL by giving an S-expression?

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[TFP'20] call for participation: Trends in Functional Programming 2020, 13-14 February, Krakow, Poland
by Peter Achten 14 Jan '20

14 Jan '20

------------------------------------------------------------------------- Call for participation 21st Symposium on Trends in Functional Programming tfp2020.org ------------------------------------------------------------------------- The list of accepted papers is available at http://www.cse.chalmers.se/~rjmh/tfp/ The symposium on Trends in Functional Programming (TFP) is an international forum for researchers with interests in all aspects of functional programming, taking a broad view of current and future trends in the area. It aspires to be a lively environment for presenting the latest research results, and other contributions. * TFP is moving to new winter dates, to provide an FP forum in between the annual ICFP events. * TFP offers a supportive reviewing process designed to help less experienced authors succeed, with two rounds of review, both before and after the symposium itself. Authors have an opportunity to address reviewers' concerns before final decisions on publication in the proceedings. * TFP offers two "best paper" awards, the John McCarthy award for best paper, and the David Turner award for best student paper. * This year we are particularly excited to co-locate with Lambda Days in beautiful Krakow. Lambda Days is a vibrant developer conference with hundreds of attendees and a lively programme of talks on functional programming in practice. TFP will be held in the same venue, and participants will be able to session-hop between the two events. Important Dates --------------- Submission deadline for pre-symposium review: 15th November, 2019 -- passed -- Submission deadline for draft papers: 10th January, 2020 -- passed -- Registration (regular): 2nd February, 2020 Registration (late): 13th February, 2020 Symposium dates: 13-14th February, 2020 Visit tfp2020.org for more information.

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Compilation errors when trying to build Gambit on Debian Stable
by John Magolske 13 Jan '20

13 Jan '20

Hi, I'm trying to build Gambit on the current Debian Stable (buster), and am getting stuck on some errors. This is with the following: uname -v -m -o #1 SMP Debian 4.19.67-2+deb10u2 (2019-11-11) x86_64 GNU/Linux gcc --version gcc (Debian 8.3.0-6) 8.3.0 I did: git clone https://github.com/gambit/gambit cd gambit ./configure make and got the following: [...] gcc -O3 -Wno-unused -Wno-write-strings -Wdisabled-optimization -fwrapv -fno-strict-aliasing -fno-trapping-math -fno-math-errno -fschedule-insns2 -fomit-frame-pointer -fPIC -fno-common -mpc64 -I"../include" -c -o os_files.o -I. -DHAVE_CONFIG_H -D___GAMBITDIR="\"/usr/local/Gambit\"" -D___GAMBITDIR_USERLIB="\"~/.gambit_userlib\"" -D___GAMBITDIR_INSTLIB="\"~~userlib\"" -D___SYS_TYPE_CPU="\"x86_64\"" -D___SYS_TYPE_VENDOR="\"pc\"" -D___SYS_TYPE_OS="\"linux-gnu\"" -D___CONFIGURE_COMMAND="\"./configure"\" -D___OBJ_EXTENSION="\".o\"" -D___EXE_EXTENSION="\"\"" -D___BAT_EXTENSION="\"\"" -D___PRIMAL os_files.c -D___LIBRARY os_files.c: In function ‘rename_long_path’: os_files.c:877:36: error: ‘RENAME_NOREPLACE’ undeclared (first use in this function); did you mean ‘MAP_FIXED_NOREPLACE’? if (!replace) flags |= RENAME_NOREPLACE; ^~~~~~~~~~~~~~~~ MAP_FIXED_NOREPLACE os_files.c:877:36: note: each undeclared identifier is reported only once for each function it appears in os_files.c:878:22: warning: implicit declaration of function ‘renameat2’; did you mean ‘renameat’? [-Wimplicit-function-declaration] result = renameat2 (olddir, oldpath2, newdir, newpath2, flags); ^~~~~~~~~ renameat make[1]: *** [makefile:400: os_files.o] Error 1 make[1]: Leaving directory '/home/john/code/gambit/lib' make: *** [makefile:475: all-recursive] Error 1 make 56.11s user 1.54s system 99% cpu 57.724 total any suggestions regarding how to proceed? Thanks, John -- John Magolske http://b79.net/contact

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[TFP'20] draft paper deadline open (January 10 2020) Trends in Functional Programming 2020, 13-14 February, Krakow, Poland
by Peter Achten 07 Jan '20

07 Jan '20

------------------------------------------------------------------------- Final call for papers 21st Symposium on Trends in Functional Programming tfp2020.org ------------------------------------------------------------------------- Did you miss the deadline to submit a paper to Trends in Functional Programming http://www.cse.chalmers.se/~rjmh/tfp/? No worries -- it's not too late! Submission is open until January 10th 2020, for a presentation slot at the event and post-symposium reviewing. The symposium on Trends in Functional Programming (TFP) is an international forum for researchers with interests in all aspects of functional programming, taking a broad view of current and future trends in the area. It aspires to be a lively environment for presenting the latest research results, and other contributions. * TFP is moving to new winter dates, to provide an FP forum in between the annual ICFP events. * TFP offers a supportive reviewing process designed to help less experienced authors succeed, with two rounds of review, both before and after the symposium itself. Authors have an opportunity to address reviewers' concerns before final decisions on publication in the proceedings. * TFP offers two "best paper" awards, the John McCarthy award for best paper, and the David Turner award for best student paper. * This year we are particularly excited to co-locate with Lambda Days in beautiful Krakow. Lambda Days is a vibrant developer conference with hundreds of attendees and a lively programme of talks on functional programming in practice. TFP will be held in the same venue, and participants will be able to session-hop between the two events. Important Dates --------------- Submission deadline for pre-symposium review: 15th November, 2019 -- passed -- Submission deadline for draft papers: 10th January, 2020 Symposium dates: 13-14th February, 2020 Visit tfp2020.org for more information.

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authentication to update wiki?
by Iain Duncan 30 Déc '19

30 Déc '19

Hi Marc and team, I noticed on the wiki there was a request to update it with some more FFI practise examples. I would be happy to do so as I figure things out, if someone can tell me how to get a wiki editing account. thanks iain

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Further examples of embedding gambit in C?
by Iain Duncan 30 Déc '19

30 Déc '19

Hi list, I'm new to Gambit, having been introduced to it by Marc from another list. (Thanks Marc!). My use case is that I want to embed a scheme interpreter in C code that is run under the SDK in Max/MSP, to do algorithmic composition and interactive computer music, making a scheme interpreter object for Max/MSP that receives scheme code from the user and calls underlying C SDK functions in Max. I'm currently working on it using S7 scheme and also evaluating other schemes as potential better long term solutions. Marc sent me the example code from the "embedding" tarball, with the example using logging and tmpnam, which was very helpful. I just wanted to ask here whether anyone else has other examples of embedding an interpreter in a C host that I could look at, or can point me at further resources or tutorials. And if anyone else is doing work in this domain, I'd love to hear about it! thanks iain

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three questions regarding gambit low level
by Jörg F. Wittenberger 27 Déc '19

27 Déc '19

Hi all, once I wrote a piece of code implementing "software transactional memory". The sugar part of it is in the tests[1]: handler can be attached to the transaction. The latter feature was used to implement a small data flow language embedded in Scheme. I miss it under gambit. If there was a STM implementation for gambit, which I could start from, please tell me. It could be quite a short cut. Otherwise I need help to understand three things: 1. Atomicity in GVM To start with I could always just have a global lock instead of lock-free updates. Optimizations might be done later. (Likely crazy, but let's see.) But I wonder: how are signal handlers actually handled? Can I declare a `for-each` statement in such a way that the GVM sees no signal handler running during execution time? Also, there appears to come some multi threaded GVM our way: will this be the case in the future too? Background: the heart of the implementation is a list of in-transaction-value records, which need to be written back to the global scope atomically. 2. Defining yet another record type. Much like SRFI-9 just two actual slots per record field, the value and a version tag. Likely doable, but the tricky part: how do I hide the version tag accessors from user code? 3. For *each slot* of a record X of type Y defined using the definition from step 2, I need to be able to create another record ITV[2]. The `for-each` from #1 traverses a ist of ITV checks the version tag from ITV against X's tag and if all goes well, copies the value field from ITV to X. In the original code, ITV holds a pointer to X and an integer offset into X representation. (A low level chicken feature `##sys#slot`.) Is there something alike in gambit? Thank you so much Jörg [1] https://github.com/0-8-15/hopefully/blob/03210411161e0df057cabf9fae73468820… [2] ITV: in-transaction-value

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How to return multiple "double" values from a C function ?
by Ryuho Yokoyama 22 Déc '19

22 Déc '19

[gambit-list] FFI C out parameters https://mailman.iro.umontreal.ca/pipermail/gambit-list/2015-January/007696.… According to the mailing list entry above: multiple "int" values: ---------- (c-declare " void add_mul(int x, int y, ___SCMOBJ res) { int add = x+y; int mul = x*y; ___VECTORSET(res, ___FIX(0), ___FIX(add)) ___VECTORSET(res, ___FIX(1), ___FIX(mul)) } ") (define (add-mul x y) (let ((res (vector 0 0))) ((c-lambda (int int scheme-object) void "add_mul") x y res) (values (vector-ref res 0) (vector-ref res 1)))) (receive (add mul) (add-mul 3 7) (pp (list 'add= add 'mul= mul))) ;; prints: (add= 10 mul= 21) ---------- In an example code, C function is returning multiple "int" values. How to write an example code returning multiple "double" values from a C function ? multiple "double" values: ---------- (c-declare " void add_mul(double x, double y, ___SCMOBJ res) { double add = x+y; double mul = x*y; ___F64VECTORSET(res, ___FIX(0), ___???(add)) ___F64VECTORSET(res, ___FIX(1), ___???(mul)) } ") (define (add-mul x y) (let ((res (vector 0 0))) ((c-lambda (double double scheme-object) void "add_mul") x y res) (values (vector-ref res 0) (vector-ref res 1)))) (receive (add mul) (add-mul 3.5 7.0) (pp (list 'add= add 'mul= mul))) ;; prints: (add= 10.5 mul= 24.5) ---------- ___F64VECTORSET(res, ___FIX(0), ___???(add)) ↑ ↑ ?? ?? 1) Is it possible to use ___F64VECTORSET macro instead of ___VECTORSET macro ? 2) Is it possible to define a ___F64(x) macro like a macro ___FIX(x) ? Thank you very much in advance.

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Third call for draft papers for TFPIE 2020 (Trends in Functional Programming in Education)
by Jurriaan Hage 20 Déc '19

20 Déc '19

Hello, Please, find below the third call for draft papers for TFPIE 2020. Please forward these to anyone you think may be interested. Apologies for any duplicates you may receive. best regards, Jurriaan Hage Chair of TFPIE 2020 ======================================================================== TFPIE 2020 Call for papers http://www.staff.science.uu.nl/~hage0101/tfpie2020/index.html February 12th 2020, Krakow, Poland (co-located with TFP 2020 and Lambda Days) *NEW* Invited Speaker We are happy to announce the invited speaker for TFPIE 2020, Thorsten Altenkirch, who also speaks at Lambda Days. At TFPIE 2020 he shall be talking about his new book, Conceptual Programming With Python. *NEW* Registration This year TFPIE takes place outside of the Lambda Days/TFP organisation, although it takes place near their location. This means you do need to register separately for TFPIE; it also means you can register for TFPIE without registering for TFP/LambdaDays, and vice versa. Registration is mandatory for at least one author of every paper that is presented at the workshop. Only papers that have been presented at TFPIE may be submitted to the post-reviewing process. Registration is 25 euro per person. TFPIE 2020 welcomes submissions describing techniques used in the classroom, tools used in and/or developed for the classroom and any creative use of functional programming (FP) to aid education in or outside Computer Science. Topics of interest include, but are not limited to: FP and beginning CS students FP and Computational Thinking FP and Artificial Intelligence FP in Robotics FP and Music Advanced FP for undergraduates FP in graduate education Engaging students in research using FP FP in Programming Languages FP in the high school curriculum FP as a stepping stone to other CS topics FP and Philosophy The pedagogy of teaching FP FP and e-learning: MOOCs, automated assessment etc. Best Lectures - more details below In addition to papers, we are requesting best lecture presentations. What's your best lecture topic in an FP related course? Do you have a fun way to present FP concepts to novices or perhaps an especially interesting presentation of a difficult topic? In either case, please consider sharing it. Best lecture topics will be selected for presentation based on a short abstract describing the lecture and its interest to TFPIE attendees. The length of the presentation should be comparable to that of a paper. On top of the lecture itself, the presentation can also provide commentary on the lecture. Submissions Potential presenters are invited to submit an extended abstract (4-6 pages) or a draft paper (up to 20 pages) in EPTCS style. The authors of accepted presentations will have their preprints and their slides made available on the workshop's website. Papers and abstracts can be submitted via easychair at the following link: https://easychair.org/conferences/?conf=tfpie2020 . After the workshop, presenters will be invited to submit (a revised version of) their article for review. The PC will select the best articles that will be published in the Electronic Proceedings in Theoretical Computer Science (EPTCS). Articles rejected for presentation and extended abstracts will not be formally reviewed by the PC. Dates Submission deadline: January 14th 2020, Anywhere on Earth. Notification: January 17th 2020 TFPIE Registration Deadline: January 20th 2020 Workshop: February 12th 2020 Submission for formal review: April 19th 2020, Anywhere on Earth. Notification of full article: June 6th 2020 Camera ready: July 1st 2020 Program Committee Olaf Chitil - University of Kent Youyou Cong - Tokyo Institute of Technology Marko van Eekelen - Open University of the Netherlands and Radboud University Nijmegen Jurriaan Hage (Chair) - Utrecht University Marco T. Morazan - Seton Hall University, USA Sharon Tuttle - Humboldt State University, USA Janis Voigtlaender - University of Duisburg-Essen Viktoria Zsok - Eotvos Lorand University Note: information on TFP is available at http://www.cse.chalmers.se/~rjmh/tfp/

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Knight's Tour Problem
by Steve Graham 05 Déc '19

05 Déc '19

Trying out a Scheme solution for this problem (), and it errored out on filter. My version of Gambit (Windows x64, 4.9.3) does not have filter. Steve

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