schedule-segments-split schedule-extract-until!
add-segments-contents-to-queue!
- %sync 8sync
+ %8sync
<run-request>
make-run-request run-request?
port-request-port
port-request-read port-request-write port-request-except
- run-it wrap run run-at run-delay
+ run-it wrap wrap-apply run run-at run-delay
%port-request %run %run-at %run-delay
- 8port-request 8run 8run-at 8run-delay
+ print-error-and-continue
+
%current-agenda
start-agenda agenda-run-once))
(define-immutable-record-type <agenda>
(make-agenda-intern queue prompt-tag
read-port-map write-port-map except-port-map
- schedule time)
+ schedule time catch-handler pre-unwind-handler)
agenda?
(queue agenda-queue)
(prompt-tag agenda-prompt-tag)
(write-port-map agenda-write-port-map)
(except-port-map agenda-except-port-map)
(schedule agenda-schedule)
- (time agenda-time))
+ (time agenda-time)
+ (catch-handler agenda-catch-handler)
+ (pre-unwind-handler agenda-pre-unwind-handler))
(define (make-async-prompt-tag)
"Make an async prompt tag for an agenda.
(write-port-map (make-hash-table))
(except-port-map (make-hash-table))
(schedule (make-schedule))
- (time (gettimeofday)))
+ (time (gettimeofday))
+ (catch-handler #f)
+ (pre-unwind-handler #f))
;; TODO: document arguments
"Make a fresh agenda."
(make-agenda-intern queue prompt
read-port-map write-port-map except-port-map
- schedule time))
+ schedule time
+ catch-handler pre-unwind-handler))
(define (current-agenda-prompt)
"Get the prompt for the current agenda; signal an error if there isn't one."
"Subtract TIME2 from TIME1"
(time-carry-correct
(cons (- (car time1) (car time2))
- (- (cdr time2) (cdr time2)))))
+ (- (cdr time1) (cdr time2)))))
(define (time-plus time1 time2)
"Add TIME1 and TIME2"
(time-carry-correct
(cons (+ (car time1) (car time2))
- (+ (cdr time2) (cdr time2)))))
+ (+ (cdr time1) (cdr time2)))))
(define-record-type <schedule>
(lambda ()
body ...))
+(define-syntax-rule (wrap-apply body)
+ "Wrap possibly multi-value function in a procedure, applies all arguments"
+ (lambda args
+ (apply body args)))
+
+
;; @@: Do we really want `body ...' here?
;; what about just `body'?
(define-syntax-rule (run body ...)
;;; =================================
;; The future's in futures
+;; @@: ... kinda conflicts with ice-9 futures. Should we rename
+;; to "futurists"? :)
(define (make-future call-first on-success on-fail on-error)
;; TODO: add error stuff here
(make-future call-first on-success on-fail on-error)
when))
-(define-syntax-rule (%sync async-request)
+(define-syntax-rule (%8sync async-request)
"Run BODY asynchronously at a prompt, passing args to make-future.
-Pronounced `eight-sync' despite the spelling.
-
-%sync was chosen because (async) was already taken and could lead to
-errors, and this version of asynchronous code uses a prompt, so the `a'
-character becomes a `%' prompt! :)
-
-The % and 8 characters kind of look similar... hence this library's
-name! (That, and the pun 'eight-synchronous' programming.)
-There are 8sync aliases if you prefer that name."
+Runs things asynchronously (8synchronously?)"
(abort-to-prompt (current-agenda-prompt)
async-request))
-(define-syntax-rule (8sync args ...)
- "Alias for %sync"
- (%sync args ...))
-
;; Async port request and run-request meta-requests
(define (make-async-request proc)
"Wrap PROC in an async-request
The purpose of this is to make sure that users don't accidentally
-return the wrong thing via (8sync) and trip themselves up."
+return the wrong thing via (%8sync) and trip themselves up."
(cons '*async-request* proc))
(define (setup-async-request resume-kont async-request)
;; TODO: deliver more helpful errors depending on what the user
;; returned
(_ (throw 'invalid-async-request
- "Invalid request passed back via an (%sync) procedure."
+ "Invalid request passed back via an (%8sync) procedure."
async-request))))
(define-syntax-rule (%run body ...)
(lambda ()
body ...)))))
-;; Aliases
-(define-syntax-rule (8run args ...) (%run args ...))
-(define-syntax-rule (8run-at args ...) (%run-at args ...))
-(define-syntax-rule (8run-delay args ...) (%run-delay args ...))
-(define-syntax-rule (8port-request args ...) (%port-request args ...))
-
\f
;;; Execution of agenda, and current agenda
;; TODO: support usecond wait time too
(match (get-wait-time)
((sec . usec)
- (select (hash-keys (agenda-read-port-map agenda))
- (hash-keys (agenda-write-port-map agenda))
- (hash-keys (agenda-except-port-map agenda))
- sec usec))))
+ (catch 'system-error
+ (lambda ()
+ (select (hash-keys (agenda-read-port-map agenda))
+ (hash-keys (agenda-write-port-map agenda))
+ (hash-keys (agenda-except-port-map agenda))
+ sec usec))
+ (lambda (key . rest-args)
+ (match rest-args
+ ((_ _ _ (EINTR))
+ '(() () ()))
+ (_ (error "Unhandled error in select!" key rest-args))))))))
(define (get-procs-to-run)
(define (ports->procs ports port-map)
(lambda (initial-procs)
(agenda-queue agenda))
(loop agenda))))))
+(define (print-error-and-continue . args)
+ "Frequently used as pre-unwind-handler for agenda"
+ (format (current-error-port) "\n*** Caught exception with arguments: ~s ***\n"
+ args)
+ (display-backtrace (make-stack #t 1 0)
+ (current-error-port))
+ (newline (current-error-port)))
+
+(define-syntax-rule (maybe-catch-all (catch-handler pre-unwind-handler)
+ body ...)
+ (if (or catch-handler pre-unwind-handler)
+ (catch
+ #t
+ (lambda ()
+ body ...)
+ (or catch-handler (lambda _ #f))
+ (or pre-unwind-handler (lambda _ #f)))
+ (begin body ...)))
+
(define (agenda-run-once agenda)
"Run once through the agenda, and produce a new agenda
based on the results"
(agenda-prompt-tag agenda)
(lambda ()
(parameterize ((%current-agenda agenda))
- (proc)))
+ (maybe-catch-all
+ ((agenda-catch-handler agenda)
+ (agenda-pre-unwind-handler agenda))
+ (proc))))
(lambda (kont async-request)
(setup-async-request kont async-request))))
projects / 8sync.git / blobdiff