From: ts <decoux@...>
Date: 2003-02-28T23:39:16+09:00
Subject: Re: I'm stuck

>>>>> "F" == Friedrich Dominicus <frido@q-software-solutions.com> writes:

F> ts <decoux@moulon.inra.fr> writes:
>> >>>>> "F" == Friedrich Dominicus <frido@q-software-solutions.com> writes:
>> 
F> int main (void){
F> int i;
F> VALUE obj;
F> VALUE klass;
F> ruby_init(); /* embed Ruby into this program! */
>> 
>> /* At this step you are playing a dangerous game with the GC */
F> what you you mean which this step ?
F> ruby_init? How should I know what else to set up or use?

 Here a stupid example :

   int main(void)
   {
       char i;
       VALUE obj;
       VALUE klass;

       ruby_init();
       obj = rb_str_new2("a string");

       /* call some ruby functions which call the GC */

       i = RSTRING(obj)->ptr[0];

       /* there are many chances than the String referenced by obj
          was removed by the GC, and you have a segfault when you try
          to access RSTRING(obj)->ptr[0] */

       return 0;
   }

F> Thanks I'll rewrite my stuff. I just wonder how you learned the usage,
F> as told before I have searched a lot if messages, but did not found
F> something that shows this...

 You have also rb_load_protect() if you want to load a file and catch the
 errors 

    rb_load_protect(VALUE path, int wrap, int *state);

 if wrap is not null, ruby make the load in an anonymous module
 If ruby has an error, state will be not null.


Guy Decoux