-(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 add-this-port port-request-args ...)
- (make-async-request
- (lambda (kont)
- (list (make-port-request port-request-args ...)
- (make-run-request kont)))))
-
-;; 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
+ (kontinue kont) #f)
+ (make-run-request (lambda () body ...) #f))))))
+
+(define (delayed-time in-secs)
+ "Calculate a cons of '(sec . usec) of IN-SECS from current time"
+ (define cur-time (gettimeofday))
+ (define cur-secs (car cur-time))
+ (define cur-usecs (cdr cur-time))
+ (define (convert-non-integer)
+ (define next-time-in-usecs
+ (+ (* (+ in-secs cur-secs) ; add our seconds to current seconds
+ 1000000) ; and turn into usecs
+ cur-usecs)) ; then add in current usecs
+ ;; convert into sec / usec pair
+ (receive (secs usecs)
+ (floor/ next-time-in-usecs 1000000)
+ (cons secs (floor usecs))))
+ (define (convert-integer)
+ (cons (+ in-secs cur-secs) cur-usecs))
+ (if (integer? in-secs)
+ (convert-integer)
+ (convert-non-integer)))
+
+;; 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 (kontinue kont) (delayed-time secs))))))
+
+;; Voluntarily yield execution
+(define (8yield)
+ "Voluntarily yield execution to the scheduler."
+ (8sync-abort-to-prompt
+ (make-async-request
+ (lambda (kont)
+ (make-run-request (kontinue kont) #f)))))