From: Noah Easterly <noah.easterly@...>
Date: 2007-04-09T09:40:07+09:00
Subject: Re: rb_yield(), break, and C extensions

On Apr 7, 3:39 pm, "Kent Sibilev" <ksr...@gmail.com> wrote:
> OK, maybe this code will clean things up:
> [...]

Now I understand.  So, the rb_ensure() only makes sure that it's third
argument is called, not that anything after that in the function
containing rb_ensure() is run.  That's what I thought it was doing -
which was leading me astray.

So the original definition of func (which allocated memory, used the
callback, freed memory, and didn't use ruby.h) won't work, I need to
divide that into 3 parts (one to alloc, one that uses the callback,
and one to free), and do something like:

static VALUE
my_meth(VALUE self)
{
  MyType * my_type = AllocMyType();

  rb_ensure(DoStuff, my_type, FreeMyType, my_type);
  return Qnil;
}

Thanks for bearing with me and explaining.