From: KDr2 <kdr2@...>
Date: 2009-04-30T15:00:04+09:00
Subject: Re: Ruby Interface of Erlang

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Thank you, I just hava done little update :
http://github.com/KDr2/erlix/tree/master#fn1

I will go on and on ...

On Thu, Apr 30, 2009 at 3:38 AM, Brian Candler <b.candler@pobox.com> wrote:

> Brian Candler wrote:
> > BTW, I haven't been able to get it to build yet - it's stuck looking for
> > -lei
>
> I found the problem. In configure.rb I had to add "-pthread" to
> --with-ldflags. Without that, mkmf.log was showing the following errors:
>
> "gcc -o conftest -I. -I/usr/local/lib/ruby/1.8/i686-linux -I./src
> -I/usr/lib/erlang/lib/erl_interface-3.5.7/include  -g -O2 conftest.c
> -L'.' -L'/usr/local/lib' -Wl,-R'/usr/local/lib'
> -L'/usr/lib/erlang/lib/erl_interface-3.5.7/lib'
> -Wl,-R'/usr/lib/erlang/lib/erl_interface-3.5.7/lib' -lei -lerl_interface
> -lruby-static -lei  -ldl -lcrypt -lm   -lc"
> /usr/lib/erlang/lib/erl_interface-3.5.7/lib/libei.a(ei_pthreads.o): In
> function `__erl_errno_place':
> (.text+0x4c): undefined reference to `pthread_once'
> /usr/lib/erlang/lib/erl_interface-3.5.7/lib/libei.a(ei_pthreads.o): In
> function `__erl_errno_place':
> (.text+0x7a): undefined reference to `pthread_getspecific'
> /usr/lib/erlang/lib/erl_interface-3.5.7/lib/libei.a(ei_pthreads.o): In
> function `__erl_errno_place':
> (.text+0xa4): undefined reference to `pthread_setspecific'
> /usr/lib/erlang/lib/erl_interface-3.5.7/lib/libei.a(ei_pthreads.o): In
> function `__erl_errno_place':
> (.text+0xb6): undefined reference to `pthread_getspecific'
> /usr/lib/erlang/lib/erl_interface-3.5.7/lib/libei.a(ei_pthreads.o): In
> function `erl_errno_key_alloc':
> (.text+0x136): undefined reference to `pthread_key_create'
> /usr/lib/erlang/lib/erl_interface-3.5.7/lib/libei.a(ei_pthreads.o): In
> function `ei_m_trylock':
> (.text+0x189): undefined reference to `pthread_mutex_trylock'
> collect2: ld returned 1 exit status
>
> However, even after successful compilation, it still didn't work due to
> a runtime linker error on "__erl_errno":
>
> irb(main):001:0> require 'erlix'
> LoadError: /usr/local/lib/ruby/site_ruby/1.8/i686-linux/erlix.so:
> undefined symbol: __erl_errno -
> /usr/local/lib/ruby/site_ruby/1.8/i686-linux/erlix.so
>  from /usr/local/lib/ruby/site_ruby/1.8/i686-linux/erlix.so
>  from (irb):1
>
> After poking around header files, I decided that the way to fix this
> was:
>
> $ make clean
> $ make CPPFLAGS=-D_REENTRANT
>
> And it happily builds and runs the sample now. I don't know how
> configure.rb should decide for itself whether -D_REENTRANT is needed or
> not.
>
> A few more suggestions:
>
> (1) For converting objects to strings, you should implement a "to_s"
> method, not "puts". Current behaviour is rather un-rubylike:
>
> irb(main):008:0> t=ErlixTuple.new([a1,f,b,a2,i])
> => #<ErlixTuple:0xb7d78d74>
> irb(main):009:0> t
> => #<ErlixTuple:0xb7d78d74>
> irb(main):010:0> t.puts                 ## unexpected
> {atom1,17.000000,#Bin,atom2,101}
> => nil
> irb(main):011:0> t.to_s
> => "#<ErlixTuple:0xb7d78d74>"           ## unexpected
>
> This would also allow you to interpolate terms into strings, e.g.
>
>  puts "The response was #{t}"
>
> (2) It would be helpful if ErlixTurple took a variable number of
> arguments, instead of a single array. That would let you write
>
>   ErlixTuple.new(a1,f,b,a2,i)
>
> This wouldn't prevent you from using an array if you like, because Ruby
> provides a 'splat' operator:
>
>   arr = [a1,f,b,a2,i]
>   ErlixTuple.new(*arr)
>
> Anyway, keep up the good work - this is looking promising!
>
> Regards,
>
> Brian.
> --
> Posted via http://www.ruby-forum.com/.
>
>


-- 
Best Regards,
   -- KDr2, at x-macro.com.

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