38 lines
1.0 KiB
Factor
Executable File
38 lines
1.0 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 accessors fry ;
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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-tuple n promise ;
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: count-down-check ( count-down -- )
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dup n>> zero? [ t swap promise>> fulfill ] [ drop ] if ;
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ERROR: invalid-count-down-count count ;
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: <count-down> ( n -- count-down )
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dup 0 < [ invalid-count-down-count ] when
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<promise> \ count-down-tuple boa
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dup count-down-check ;
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ERROR: count-down-already-done ;
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: count-down ( count-down -- )
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dup n>> dup zero?
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[ count-down-already-done ]
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[ 1 - >>n count-down-check ] if ;
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: await-timeout ( count-down timeout -- )
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[ promise>> ] dip ?promise-timeout ?linked t assert= ;
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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 ] ] keep
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"Count down stage"
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swap promise>> mailbox>> spawn-linked-to drop ;
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