Erlang Questions Google Group

Re: [erlang-questions] New Book "Erlang Programming" from O'Reilly

bobca...@tampabay.rr.com (Bob Calco) — Sat, 06 Sep 2008 17:25:08 UT

Fellow Erlangers:
I am also a co-author of "Concurrent Programming with Erlang/OTP", and the
original guy who sold Manning on the book idea.
Since that time I have been buried in a huge Erlang project that has
ironically made it very hard for me to contribute as much time as I would
like to this august forum, let alone the book, which is why I am glad I was

[erlang-questions] [bug?] R12B-4 HTTP header parsing

ig...@free.fr (igwan) — Sat, 06 Sep 2008 11:49:59 UT

Hi,
While testing the new erlang:decode_packet/3 I found it returns
http_error for inputs that are allowed by RFC2616 :
1> erlang:decode_packet(httph,<<" Host: erlang.org:80\r\n\r\n">>,[]).
{ok,{http_header,14,'Host',und efined,"erlang.org:80"},
<<"\r\n">>}
2> erlang:decode_packet(httph,<<" Host : erlang.org:80\r\n\r\n">>,[]).

Re: [erlang-questions] New Book "Erlang Programming" from O'Reilly

martin.lo...@orbitz.com (Martin Logan) — Sat, 06 Sep 2008 04:47:02 UT

Yes we are working quite hard on this one. The stuff in MEAP is not really
worth reading right now as it is in pre pre beta form and very unedited. We
are moving quickly though and will be putting a much larger set of text and
code (which actually works, the stuff in the second chapter of what is
currently out there is not even compliable at this point :) )

Re: [erlang-questions] Executing an Erlang function from Perl

anders.nyg...@gmail.com (Anders Nygren) — Fri, 05 Sep 2008 17:41:15 UT

2008/9/5 Sebastian Bello <sebastian.be...@inswitch.us>:
Sebastian
Dir = filename:dirname(Beam),
code:addpatha(Dir)
/Anders
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Re: [erlang-questions] Executing an Erlang function from Perl

sebastian.be...@inswitch.us (Sebastian Bello) — Fri, 05 Sep 2008 16:47:57 UT

Thanks Bengt and Chandru.
An additional question: if I know the full path to a .beam file, and
that path has no been added with a -pa for example, what would be the
way to execute a function of that module?
Sebastian-
Chandru escribió:

Re: [erlang-questions] Time to update programming rules?

btolp...@bigpond.net.au (Benjamin Tolputt) — Fri, 05 Sep 2008 03:17:50 UT

I too would like some clarification on this. Is this because you
disapprove of the design (i.e. personal opinion), because the Erlang
developers have recommended it not be used (i.e. it is an experimental
or soon to be removed feature), or something else?
The idea of using the package support appeals to me as it will help keep

Re: [erlang-questions] Time to update programming rules?

btolp...@bigpond.net.au (Benjamin Tolputt) — Fri, 05 Sep 2008 04:10:54 UT

I understand the possibility of errors. Possibility of error is a decent
point, but one that can (and has) been made about other parts of the
Erlang system. As I understand it then, this is an "opinion" exclusion
of use rather than one endorsed by the developers of Erlang (given they
implemented it and have yet to remove it from the system). Not throwing

Re: [erlang-questions] Application granularity (was: Parallel Shootout & a style question)

u...@wiger.net (Ulf Wiger) — Fri, 05 Sep 2008 15:03:42 UT

2008/9/5 Jay Nelson <j...@duomark.com>:
Well, there is a foolish corner in the brain of the wisest man,
said Aristotle. It probably holds true still. ;-)
I've long since lost count of all the not-so-bright ideas I've aired
over the years. I hope everyone else has, too. (:
BR,
Ulf W
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Re: [erlang-questions] Application granularity (was: Parallel Shootout & a style question)

j...@duomark.com (Jay Nelson) — Fri, 05 Sep 2008 14:53:57 UT

I conflated several topics that were discussed in the previous thread.
You are right, and this can be done incrementally, even by the community
as contributions back to the OTP team.
jay
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Re: [erlang-questions] New Book "Erlang Programming" from O'Reilly

pat.ey...@gmail.com (pat eyler) — Fri, 05 Sep 2008 14:44:32 UT

O'Reilly's not the only publisher with an Erlang book
coming out. I posted a while ago about a
then-anonymous publsiher and their plans:
[link]
Since then, Manning has come out of hiding and
announced their book, which is now partially available in

Re: [erlang-questions] Application granularity (was: Parallel Shootout & a style question)

j...@duomark.com (Jay Nelson) — Fri, 05 Sep 2008 14:41:46 UT

A later posting proposed a gen_stream library:
[link]
031634.html
which was a change in my thinking based on the earlier failed
proposition,
the introduction of binary comprehensions (which I think were a
fantastic
addition, although I'm a bit biased) and the flurry of discussions about

Re: [erlang-questions] Application granularity (was: Parallel Shootout & a style question)

j...@duomark.com (Jay Nelson) — Fri, 05 Sep 2008 14:35:16 UT

Quite right, but that's where the architecture challenge is. There
has to be some areas of the problem where it can be split differently
if you assume the hardware is constructed differently. For example,
why not one process per subscriber for services lookup rather than a
central database?

Re: [erlang-questions] Application granularity (was: Parallel Shootout & a style question)

j...@duomark.com (Jay Nelson) — Fri, 05 Sep 2008 14:26:34 UT

I did suggest it and after a discussion involving Kostis
and some of the language implementers, I realized it
was counter to the philosophy of erlang: code is sequential,
processes are explicit. It makes the implementation of the
language far easier to manage and the results far more predictable
for a programmer. (Or more bluntly, I was disabused of the idea.)

Re: [erlang-questions] pgsql:prepare() doesn't work with PostgreSQL 8.3.3

neav...@gmail.com (Sergey S.) — Fri, 05 Sep 2008 12:30:44 UT

Hello.
As addition to the previous message on pgsql. Such code:
pgsql:pquery(Db, "INSERT INTO foo VALUES ($1)", [555])
also doesn't work, producing the error:
------------------------------ ------------------------------ ------------
** exception exit: {timeout,
{gen_server,call,

[erlang-questions] PID recycling

zoltan.peter.t...@ericsson.com (Zoltan Peter Toth) — Fri, 05 Sep 2008 12:08:22 UT

Hi,
I saw that Erlang PID-s, beside their visible part, have an invisible
part, incarnation counter.
It appears to be cycled between the values 1->2->3. (Look at the
last byte of the binaries below.)
erl -sname a
Erlang (BEAM) emulator version 5.6.1 [source] [async-threads:0]
[kernel-poll:false]
Eshell V5.6.1 (abort with ^G)