40 lines
1.1 KiB
Factor
Executable File
40 lines
1.1 KiB
Factor
Executable File
! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: dlists kernel math concurrency.promises
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concurrency.mailboxes ;
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IN: concurrency.count-downs
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! http://java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/CountDownLatch.html
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TUPLE: count-down n promise ;
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: count-down-check ( count-down -- )
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dup count-down-n zero? [
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t swap count-down-promise fulfill
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] [ drop ] if ;
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: <count-down> ( n -- count-down )
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dup 0 < [ "Invalid count for count down" throw ] when
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<promise> \ count-down construct-boa
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dup count-down-check ;
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: count-down ( count-down -- )
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dup count-down-n dup zero? [
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"Count down already done" throw
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] [
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1- over set-count-down-n
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count-down-check
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] if ;
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: await-timeout ( count-down timeout -- )
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>r count-down-promise r> ?promise-timeout drop ;
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: await ( count-down -- )
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f await-timeout ;
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: spawn-stage ( quot count-down -- )
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[ [ count-down ] curry compose ] keep
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"Count down stage"
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swap count-down-promise
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promise-mailbox spawn-linked-to drop ;
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