38 lines
1001 B
Scheme
38 lines
1001 B
Scheme
(define-record-type :async-channel
|
|
(really-make-async-channel in-channel out-channel)
|
|
async-channel?
|
|
(in-channel async-channel-in-channel)
|
|
(out-channel async-channel-out-channel))
|
|
|
|
(define (make-async-channel)
|
|
(let ((in-channel (make-channel))
|
|
(out-channel (make-channel)))
|
|
(spawn
|
|
(lambda ()
|
|
(let ((queue (make-queue)))
|
|
(let loop ()
|
|
(if (queue-empty? queue)
|
|
(begin
|
|
(enqueue! queue (receive in-channel))
|
|
(loop))
|
|
(select
|
|
(wrap (receive-rv in-channel)
|
|
(lambda (message)
|
|
(enqueue! queue message)
|
|
(loop)))
|
|
(wrap (send-rv out-channel (queue-front queue))
|
|
(lambda (ignore)
|
|
(dequeue! queue)
|
|
(loop)))))))))
|
|
(really-make-async-channel in-channel
|
|
out-channel)))
|
|
|
|
(define (send-async channel message)
|
|
(send (async-channel-in-channel channel) message))
|
|
|
|
(define (receive-async-rv channel)
|
|
(receive-rv (async-channel-out-channel channel)))
|
|
|
|
(define (receive-async channel)
|
|
(sync (receive-async-rv channel)))
|