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Clarify current-future. (#1780)

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Sam Tobin-Hochstadt 2017-08-23 16:58:52 -04:00 committed by GitHub
parent e9f2c084eb
commit 3dd17c73ed
1 changed files with 4 additions and 2 deletions
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6
pkgs/racket-doc/scribblings/reference/futures.scrbl
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@ -81,10 +81,12 @@ execute through a call to @racket[touch], however.
@defproc[(current-future) (or/c #f future?)]{ @defproc[(current-future) (or/c #f future?)]{
Returns the descriptor of the future whose thunk execution is the Returns the descriptor of the future whose thunk execution is the
current continuation. If a future thunk itself uses @racket[touch], current continuation; that is, if a future descriptor @racket[f] is returned,
@racket[(touch f)] will produce the result of the current continuation.
If a future thunk itself uses @racket[touch],
future-thunk executions can be nested, in which case the descriptor of future-thunk executions can be nested, in which case the descriptor of
the most immediately executing future is returned. If the current the most immediately executing future is returned. If the current
continuation is not a future-thunk execution, the result is continuation does not return to the @racket[touch] of any future, the result is
@racket[#f]. @racket[#f].
} }