From: ts <decoux@...>
Date: 2004-06-06T17:44:44+09:00
Subject: Re: Problems with Ruby GC'ing a variable I'm using.

>>>>> "A" == Austin McDonald <austin-mcdonald@utulsa.edu> writes:

A> In this code snippet, p->popArray is the one getting GC'd.  My mark 
A> function only does this:

 Your mark function is wrong, you must write it

A> void pop_mark(VALUE self) {
A>     Population* p;
A>     Data_Get_Struct(self, Population, p);
A>     rb_gc_mark(p->popArray);
A> }

   void pop_mark(Population *)
   {
       rb_gc_mark(p->popArray);
   }


A> VALUE
A> pop_new(VALUE class, VALUE size, VALUE tagsize, VALUE strategysize) {

  it's best if you use the scheme allocate/initialize rather than new

A>     Population* p = ALLOC(Population);
A>     /* do some stuff to the struct*/
A>     VALUE obj = Data_Wrap_Struct(class, pop_mark, free, p);

 best to use Data_Make_Struct

       obj = Data_Make_Struct(class, Population, pop_mark, free, p);

 the advantage is that p will be filled with zero, it's important for the
 GC (try to avoid the variable name `class')


A>     VALUE argv[3];



Guy Decoux