8sync-delay
8sync-run 8sync-run-at 8sync-run-delay
- 8sync-nowait
+ 8sync
8sleep
;; used for introspecting the error, but a method for making
%current-agenda
start-agenda agenda-run-once))
-(install-suspendable-ports!)
-
;; @@: Using immutable agendas here, so wouldn't it make sense to
;; replace this queue stuff with using pfds based immutable queues?
"Invalid request passed back via an (8sync) procedure."
async-request))))
-(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 (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 ...))
-
-;; TODO: Write (%run-immediately)
-
-(define-syntax-rule (8sync-nowait body)
+(define-syntax-rule (8sync body ...)
"Run body asynchronously but ignore its result...
forge ahead in our current function!"
(8sync-abort-to-prompt
;; Otherwise we sometimes get errors like
;; "Zero values returned to single-valued continuation""
(wrap (kont #f)) #f)
- (make-run-request (lambda () body) #f))))))
+ (make-run-request (lambda () body ...) #f))))))
-;; This is sugar... and could probably be considerably
-;; simplified and optimized. But whatever.
-(define-syntax-rule (8sleep time)
- (8sync-delay 'no-op time))
+;; 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)))))
\f
;;; Execution of agenda, and current agenda
(post-run-hook #f))
;; TODO: Document fields
"Start up the AGENDA"
+ (install-suspendable-ports!)
(let loop ((agenda agenda))
(let ((agenda
;; @@: Hm, maybe here would be a great place to handle