From: "Mauricio Fernández" <batsman.geo@...>
Date: 2003-03-01T18:37:45+09:00
Subject: Re: I'm stuck

On Sat, Mar 01, 2003 at 04:26:49PM +0900, Friedrich Dominicus wrote:
> ts <decoux@moulon.inra.fr> writes:
> 
> > >>>>> "F" == Friedrich Dominicus <frido@q-software-solutions.com> writes:
> > 
> > F> Ok I understand that now, what do I have to do that it does not
> > F> happen? 
> > 
> >  Well in my case you need to write
> > 
> >    void tt()
> >    {
> >        char i;
> >        VALUE obj;
> > 
> >        obj = rb_str_new2("a string");
> > 
> >        /* call some ruby functions which call the GC */
> > 
> >        i = RSTRING(obj)->ptr[0];
> >    }
> I have another question related to this, aren't there any functions
> provided to inform the GC that a particular object should not be
> collected at the moment? As shown I do not know the ins/outs from

If you hold a reference to it in the stack it won't be collected.
If it's in a global variable, you can use

void
rb_gc_register_address(addr)
    VALUE *addr;

void
rb_gc_unregister_address(addr)
    VALUE *addr;


> Ruby, but I have learned about dealing with a copying GC in Eiffel an
> there some features are provided to exclude a particular object from
> beein moved. There this function have names with freeze or frozen in
> it. Is OBJ_FREEZE supposed to do something simular?

Ruby's GC is mark & sweep, not copying, so objects are never moved.
In Ruby frozen objects cannot be modified but they will be GCed if
there's no reference to them.

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