-(define-record-type <wrapped-exception>
- (make-wrapped-exception key args stacks)
- wrapped-exception?
- (key wrapped-exception-key)
- (args wrapped-exception-args)
- (stacks wrapped-exception-stacks))
-
-(define-syntax-rule (propagate-%async-exceptions body)
- (let ((body-result body))
- (if (wrapped-exception? body-result)
- (throw '8sync-caught-error
- (wrapped-exception-key body-result)
- (wrapped-exception-args body-result)
- (wrapped-exception-stacks body-result))
- body-result)))
-
-(define-syntax %8sync
- (syntax-rules ()
- "Run BODY asynchronously (8synchronously?) at a prompt, then return.
-
-Possibly specify WHEN as the second argument."
- ((%8sync body)
- (%8sync-run body))
- ((%8sync body when)
- (%8sync-run-at body when))))
-
-(define-syntax-rule (%8sync-run body ...)
- (%8sync-run-at body ... #f))
-
-(define-syntax-rule (%8sync-run-at body ... when)
- (propagate-%async-exceptions
- (%8sync-abort-to-prompt
- ;; Send an asynchronous request to apply a continuation to the
- ;; following function, then handle that as a request to the agenda
- (make-async-request
- (lambda (kont)
- ;; We're making a run request
- (make-run-request
- ;; Wrapping the following execution to run...
- (wrap
- ;; Once we get the result from the inner part, we'll resume
- ;; this continuation, but first
- ;; @@: Is this running immediately, or queueing the result
- ;; after evaluation for the next agenda tick? It looks
- ;; like evaluating immediately. Is that what we want?
- (kont
- ;; Any unhandled errors are caught
- (let ((exception-stack #f))
- (catch #t
- ;; Run the actual code the user requested
- (lambda ()
- body ...)
- ;; If something bad happened and we didn't catch it,
- ;; we'll wrap it up in such a way that the continuation
- ;; can address it
- (lambda (key . args)
- (cond
- ((eq? key '8sync-caught-error)
- (match args
- ((orig-key orig-args orig-stacks)
- (make-wrapped-exception
- orig-key orig-args
- (cons exception-stack orig-stacks)))))
- (else
- (make-wrapped-exception key args
- (list exception-stack)))))
- (lambda _
- (set! exception-stack (make-stack #t 1 0)))))))
- when))))))
-
-(define-syntax-rule (%8sync-run-delay body ... delay-time)
- (%8sync-run-at body ... (tdelta delay-time)))
-
-(define-syntax-rule (%8sync-delay args ...)
- (%8sync-run-delay args ...))
-
-(define-syntax-rule (%8sync-port port port-request-args ...)
- (%8sync-abort-to-prompt