How to rescue your Rubies in C!

rescue_demo.c

static void i_fail(VALUE self)
{
  rb_raise(rb_eRuntimeError, "Oh knowz!");
}

static void rescue(VALUE self, VALUE exception) 
{
  /* This function _is not_ in <ruby.h>
   * http://clalance.blogspot.co.uk/2011/01/writing-ruby-extensions-in-c-part-5.html
   */
  rb_exc_raise(exception);
}

static void demo(VALUE self)
{
  rb_rescue(i_fail, self, rescue, self);  
}

rescue_demo.rb

def demo
  begin
    i_fail
  rescue Exception => ex
    throw ex
  end
end

def i_fail
  fail "Oh knowz!"
end