-(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-rule (%run body ...)
- (%run-at body ... #f))
-
-(define-syntax-rule (%run-at body ... when)
- ;; 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 (%run-delay body ... delay-time)
- (%run-at body ... (tdelta delay-time)))
-
-(define-syntax-rule (%port-request port port-request-args ...)
- (make-async-request
- (lambda (kont)
- (list (make-port-request port port-request-args ...)
- (make-run-request kont #f)))))
-
-(define-syntax-rule (%port-remove-request port)
- (make-async-request
- (lambda (kont)
- (list (make-port-remove-request port)
- (make-run-request kont #f)))))
-
-
-;; Sugar
-(define-syntax-rule (%8sync-run rest ...)
- "Sugar for (%8sync (%run ...))"
- (%8sync (%run rest ...)))
-
-(define-syntax-rule (%8sync-run-at rest ...)
- "Sugar for (%8sync (%run-at ...))"
- (%8sync (%run-at rest ...)))
-
-(define-syntax-rule (%8sync-run-delay rest ...)
- "Sugar for (%8sync (%run-delay ...))"
- (%8sync (%run-delay rest ...)))
-
-(define-syntax-rule (%8sync-port rest ...)
- "Sugar for (%8sync (%port-request ...))"
- (%8sync (%port-request rest ...)))
-
-(define-syntax-rule (%8sync-port-remove rest ...)
- "Sugar for (%8sync (%port-remove-request ...))"
- (%8sync (%port-remove-request rest ...)))
-
-
-;; TODO: Write (%run-immediately)
-
-;; TODO
-(define-syntax-rule (%run-with-return return body ...)
- (make-async-request
- (lambda (kont)
- (let ((return kont))
- (lambda ()
- body ...)))))
-
-(define-syntax-rule (catch-8sync exp (handler-key handler) ...)
- (catch '8sync-caught-error
- (lambda ()
- exp)
- (lambda (_ orig-key orig-args orig-stacks)
- (cond
- ((or (eq? handler-key #t)
- (eq? orig-key handler-key))
- (apply handler orig-stacks orig-args)) ...
- (else (raise '8sync-caught-error
- orig-key orig-args orig-stacks))))))
-
-;; Alias...?
-(define-syntax-rule (catch-%8sync rest ...)
- (catch-8sync rest ...))
-
+(define-syntax-rule (8sync body ...)
+ "Run body asynchronously but ignore its result...
+forge ahead in our current function!"
+ (8sync-abort-to-prompt
+ (make-async-request
+ (lambda (kont)
+ (list (make-run-request
+ ;; What's with returning #f to kont?
+ ;; Otherwise we sometimes get errors like
+ ;; "Zero values returned to single-valued continuation""
+ (wrap (kont #f)) #f)
+ (make-run-request (lambda () body ...) #f))))))
+
+;; TODO: Rewrite when we move to this being just `sleep'.
+(define (8sleep secs)
+ "Like sleep, but asynchronous."
+ (8sync-abort-to-prompt
+ (make-async-request
+ (lambda (kont)
+ (make-run-request (lambda () (kont #f)) (tdelta secs))))))
+
+(define (8usleep usecs)
+ "Like usleep, but asynchronous."
+ (define (usecs->time-pair)
+ (if (< 1000000)
+ (cons 0 usecs)
+ (let* ((sec (floor (/ usecs 1000000)))
+ (msec (- usecs (* sec 1000000))))
+ (cons sec msec))))
+ (8sync-abort-to-prompt
+ (make-async-request
+ (lambda (kont)
+ (make-run-request (lambda () (kont #f)) (tdelta usecs->time-pair))))))
+
+;; Voluntarily yield execution
+(define (yield) ; @@: should this be define-inlinable?
+ "Voluntarily yield execution to the scheduler."
+ (8sync-abort-to-prompt
+ (make-async-request
+ (lambda (kont)
+ (make-run-request (lambda () (kont #f)) #f)))))