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Add #:on-crash to during/actor

This commit is contained in:
Tony Garnock-Jones 2016-10-30 20:30:38 -04:00
parent 37af1e8726
commit 2d1ad8a62d
1 changed files with 15 additions and 8 deletions
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23
racket/syndicate/actor.rkt
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@ -255,6 +255,10 @@
(pattern (~seq #:actor wrapper))
(pattern (~seq) #:attr wrapper #'actor))
(define-splicing-syntax-class on-crash-option
(pattern (~seq #:on-crash expr))
(pattern (~seq) #:attr expr #f))
(define-splicing-syntax-class name
(pattern (~seq #:name N))
(pattern (~seq) #:attr N #'#f))
@ -438,7 +442,7 @@
(define-syntax (during/actor stx)
(syntax-parse stx
[(_ P w:actor-wrapper name:name O ...)
[(_ P w:actor-wrapper name:name oncrash:on-crash-option O ...)
(define E-stx (syntax/loc #'P (asserted P)))
(define-values (_proj _pat _bindings instantiated)
(analyze-pattern E-stx #'P))
@ -451,13 +455,16 @@
;; Supply (inst) appeared before demand (p) retracted.
;; Transition to a state where we monitor demand, but also
;; express interest in supply: this latter acts as a signal
;; to the supply that it should stick around. We could, if
;; we liked, react to retraction of supply before
;; retraction of demand, interpreting it perhaps as a crash
;; of some kind. Once demand is retracted, this facet
;; terminates, retracting its interest in supply, thereby
;; signalling to the supply that it is no longer wanted.
(react (stop-when (retracted inst)) ;; NOT OPTIONAL
;; to the supply that it should stick around. We react to
;; retraction of supply before retraction of demand by
;; invoking the on-crash expression, if supplied. Once
;; demand is retracted, this facet terminates, retracting
;; its interest in supply, thereby signalling to the supply
;; that it is no longer wanted.
(react (stop-when (retracted inst) ;; NOT OPTIONAL
#,@(if (attribute oncrash.expr)
#'(oncrash.expr)
#'()))
(stop-when (retracted p))))
(stop-when (retracted p)
;; Demand (p) retracted before supply (inst) appeared. We