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reference: document the synchronizaion result of delay/sync

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... and, by implication, `delay/therad`.

Closes 1820
This commit is contained in:
Matthew Flatt 2018-06-20 18:19:57 -06:00
parent 4f658904b5
commit 6ec6b39827
1 changed files with 1 additions and 0 deletions
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pkgs/racket-doc/scribblings/reference/promise.scrbl
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@ -101,6 +101,7 @@ thread other than one currently running the promise causes the
promise is also a @tech{synchronizable event} for use with promise is also a @tech{synchronizable event} for use with
@racket[sync]; @racket[sync]ing on the promise does not @racket[force] @racket[sync]; @racket[sync]ing on the promise does not @racket[force]
it, but merely waits until a value is forced by another thread. it, but merely waits until a value is forced by another thread.
The @tech{synchronization result} is @|void-const|.
If a promise created by @racket[delay/sync] is forced on a thread that If a promise created by @racket[delay/sync] is forced on a thread that
is already running the promise, an exception is raised in the same way is already running the promise, an exception is raised in the same way