[plt-scheme] Implementing engines using threads

I would use:

(define-values (i o) (make-pipe))
(start-the-engine)
(let ([val (read o)])
  (if (equal? val eof)
      'failure
      'success))

And in the engine, success would print the return value and close the port,
failure would close the port.

Simple and elegant, in my view. Probably costs a lot of resources though.
 

Yours truly,

ifconfig

BAGOS

http://bagos.sourceforge.net