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#| proxy.jl -- move a function to a separate thread
$Id: proxy.jl,v 1.1 2002/04/14 07:22:41 jsh Exp $
Copyright (C) 2001 John Harper <jsh@pixelslut.com>
This file is part of librep.
librep is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
librep is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with librep; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|#
;; I don't think I ever tested this code, but I'm tired of having it
;; sitting in working copy of the sources..
(define-structure rep.threads.proxy
(export make-thread-proxy
thread-proxy-async-call
thread-proxy-delete)
(open rep
rep.threads
rep.threads.message-port)
(define special-token (cons))
(define (make-thread-proxy function)
(let ((in-port (make-message-port))
proxy-thread)
(define (thread-thunk)
(while t
(let ((data (message-fetch in-port)))
(case (car data)
((sync-call)
(let ((return-port (cadr data))
(args (cddr data)))
(call-with-exception-handler
(lambda ()
(let ((result (apply function args)))
(message-send return-port (cons t result))))
(lambda (exception)
(message-send return-port (cons nil exception))))))
((async-call)
(apply function (cdr data)))
(t (error "Unknown proxy operation: %s\n" (car data)))))))
(define (proxy . args)
(if (eq (car args) special-token)
(case (cadr args)
((async) (message-send in-port (cons 'async-call (cddr args))))
((get-thread) proxy-thread)
(t (error "Unknown special call: %s" (cadr args))))
;; synchronous call
(let ((return-port (make-message-port)))
(message-send in-port (list* 'sync-call return-port args))
(let ((result (message-fetch return-port)))
(if (car result)
(cdr result)
(raise-exception (cdr result)))))))
(setq proxy-thread (make-thread thread-thunk "object-proxy"))
proxy))
(define (thread-proxy-async-call proxy . args)
(apply proxy special-token 'async args))
(define (thread-proxy-delete proxy)
(thread-delete (proxy special-token 'get-thread))))
|
