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macro-stepper: fix race condition in frame init / events

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This commit is contained in:
Ryan Culpepper 2010-11-08 15:03:33 -07:00
parent ae164d281b
commit 1fe73ffaef
1 changed files with 3 additions and 3 deletions
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6
collects/macro-debugger/tool.rkt
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@ -47,21 +47,21 @@
(define stepper #f)
(inherit new-stepper)
(define/public (lazy-new-stepper)
(define/private (lazy-new-stepper)
(unless stepper
(set! stepper (new-stepper))))
(define/override (add-trace events)
(lazy-new-stepper)
(parameterize ((current-eventspace eventspace))
(queue-callback
(lambda ()
(lazy-new-stepper)
(super add-trace events)))))
(define/override (add-deriv deriv)
(lazy-new-stepper)
(parameterize ((current-eventspace eventspace))
(queue-callback
(lambda ()
(lazy-new-stepper)
(super add-deriv deriv)))))
(define/override (new-stepper-frame)