I'd like to use Ruby as an extension language for software written on
a Windows-like (actually xbox360) platform in C++.

Specifically, I'd like to be able to embed a Ruby interpreter into my
application so that I can do the following things:
1. Call Ruby functions from C++
2. Call C++ functions from Ruby
3. Exchange data between the C++ application the the Ruby interpreter.

I have experience doing these exact things in Lua. I understand that
doing this in Ruby is going to be more painful than doing it in Lua as
this was one of Lua's primary goals, but what I'm hoping is that it's
*possible* to do it in Ruby. (:

(because we all know that  writing Ruby code is so much more enjoyable
than writing Lua code)

So. I downloaded the Ruby source. I had to hack it up a bit because
the xbox is slightly different than windows, but I got a red thread
going. (passing scripts in through -e)

Obviously booting up the interpreter from scratch each time I want to
run some ruby code isn't going to work:
ruby_init();
ruby_options();
ruby_run();

Is there a document somewhere that describes how to properly use ruby
as an extension language? Is the something comparable to luaL_dofile
or luaL_dostring and lua_register?

Am I way off base?

1000 thanks in advance for any insight,
-Harold