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Fix docs on continuation barriers

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Closes PR 13085
This commit is contained in:
Asumu Takikawa 2012-11-02 18:30:47 -04:00
parent 4948ca0863
commit 27aa999446
1 changed files with 8 additions and 7 deletions
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15
collects/scribblings/reference/eval-model.scrbl
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@ -683,13 +683,14 @@ the marks associated with the relevant frames are also captured.
A @deftech{continuation barrier} is another kind of continuation frame
that prohibits certain replacements of the current continuation with
another. Specifically, a continuation can be replaced by another only
when the replacement does not introduce any continuation barriers (but
it may remove them). A continuation barrier thus prevents ``downward
jumps'' into a continuation that is protected by a barrier. Certain operations
install barriers automatically; in particular, when an exception
handler is called, a continuation barrier prohibits the continuation
of the handler from capturing the continuation past the exception
point.
when the replacement does not introduce any continuation barriers. It
may remove continuation barriers only through jumps to continuations
that are a tail of the current continuation. A continuation barrier
thus prevents ``downward jumps'' into a continuation that is protected
by a barrier. Certain operations install barriers automatically; in
particular, when an exception handler is called, a continuation
barrier prohibits the continuation of the handler from capturing the
continuation past the exception point.
A @deftech{escape continuation} is essentially a derived concept. It
combines a prompt for escape purposes with a continuation for