From: "Suraj N. Kurapati" <sunaku@...>
Date: 2008-03-30T00:47:29+09:00
Subject: Re: embedding Ruby 1.9.0 inside rb_thread_create()

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ts wrote:
> Suraj N. Kurapati wrote:
>> Why does this example fail with Ruby 1.9.0 ?
> 
>  For 2 reasons
> 
>  * you don't make a full initialisation of the interpreter, i.e. you
>  are missing a call to Init_prelude() after ruby_init_loadpath()

Thanks!  I made this correction and the example proceeds further.

>  * you never protect your program against error that ruby can
>    generate

The main reason for the crash seems to be the following line inside
the_ruby_thread() function:

  rb_eval_string("p :current => Thread.current, :main => Thread.main");

This is harmless code that shouldn't raise any exceptions.  So I
wonder: did I miss any other steps in the Ruby interpreter
initialization process?

---

Please try the attached example both (1) as-is, and (2) by
uncommenting the following lines inside the_ruby_thread() function:

//    printf("R: ");
//    fflush(stdout);
//    rb_eval_string("p :current => Thread.current, :main =>
Thread.main");

The example should work as-is with Ruby 1.9.0, but it should fail
when the above lines are uncommented.

> it's normal that Init_prelude() is not declared in any include
>  file ?

Interesting.  That function is not declared in any header file, but
only inside ruby.c:917.  Why am I able to call it then?

Thanks for your consideration.

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