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make call-with-stack-checkpoint grab the context at the right place

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svn: r15046
This commit is contained in:
Eli Barzilay 2009-06-02 14:19:58 +00:00
parent f686032166
commit 506336b9ee
1 changed files with 6 additions and 3 deletions
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9
collects/drscheme/private/rep.ss
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@ -45,13 +45,16 @@ TODO
(define stack-checkpoint (make-parameter #f))
(define checkpoints (make-weak-hasheq))
(define (call-with-stack-checkpoint thunk)
(define checkpoint (current-continuation-marks))
(define checkpoint #f)
(call-with-exception-handler
(λ (exn)
(unless (hash-has-key? checkpoints exn)
(when (and checkpoint ; just in case there's an exception before it's set
(not (hash-has-key? checkpoints exn)))
(hash-set! checkpoints exn checkpoint))
exn)
thunk))
(lambda ()
(set! checkpoint (current-continuation-marks))
(thunk))))
;; returns the stack of the input exception, cutting off any tail that was
;; registered as a checkpoint
(define (cut-stack-at-checkpoint exn)