Calling blocks and Proc objects from C: let me guess?

[Asfand Yar Qazi]

Hi,

I plan on letting the user give me Proc objects that I will execute in
response to certain events (ala Socket-Slot thingy.)

I plan on calling the Proc objects from C code. But I'm not sure how.

Here's what I've guessed at so far:
An object of type T_OBJECT will be of class rb_cProc. (lets call it 'pr')
To call it with 2 arguments, ("Hello", 8007), we do this:

if(!rb_obj_is_instance_of(pr, rb_cProc))
/* raise, etc. */
rb_funcall(pr, rb_intern("call"), 2, rb_str_new2("Hello"), INT2NUM(8007))

Is there a more efficient way?

Thanks,
Asfand Yar