From: Kaspar Schiess <eule@...>
Date: 2005-02-10T16:38:55+09:00
Subject: rb_callcc from c extension: musing

Hello all, 

In a sharing mood: Am I the only one who did not see how this can be done ? 

Ruby's C API is so elegant, I feel shabby next to it sometimes. I was 
trying to get my hands on a continuation from C code lately (for various 
reasons that shall not be disclosed publicly, as is often the case with 
cc's). Looking up in ruby.h came up with no match for 'callcc', so I 
checked in README.EXT (ups should have started there), nothing either. 

Looking at eval.c I got disappointed: the thing is declared static 
(rb_callcc). Probably for some good reason. 

The thing I came up with is this: 
  http://www.tua.ch/ruby/rubycc/rubycc.html
That couldn't possibly work. 

But it actually does. Thank you matz ! 

kaspar

code manufacture - ruby lab
www.tua.ch/ruby