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guide: in example, display all strings in the result channel

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There may be still a string in the result-channel, because it is possible that the main thread exits before the result-thread calls `(channel-get result-channel)' and display its result.
This commit is contained in:
Noah W M 2019-08-01 20:40:23 +08:00 committed by Matthew Flatt
parent a5f70561d2
commit e30342236a
1 changed files with 4 additions and 3 deletions
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7
pkgs/racket-doc/scribblings/guide/concurrency.scrbl
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@ -194,7 +194,7 @@ the items and then pass their results to the result thread via the @racket[resul
(define result-thread
(thread (lambda ()
(let loop ()
(displayln (channel-get result-channel))
(display (channel-get result-channel))
(loop)))))
(define work-channel (make-channel))
@ -206,10 +206,10 @@ the items and then pass their results to the result thread via the @racket[resul
(case item
[(DONE)
(channel-put result-channel
(format "Thread ~a done" thread-id))]
(format "Thread ~a done\n" thread-id))]
[else
(channel-put result-channel
(format "Thread ~a processed ~a"
(format "Thread ~a processed ~a\n"
thread-id
item))
(loop)])))))
@ -217,6 +217,7 @@ the items and then pass their results to the result thread via the @racket[resul
(for ([item '(A B C D E F G H DONE DONE)])
(channel-put work-channel item))
(for-each thread-wait work-threads)
(channel-put result-channel "") (code:comment "waits until result-thread has printed all other output")
]
@section{Buffered Asynchronous Channels}