93 lines
2.2 KiB
Factor
93 lines
2.2 KiB
Factor
! Copyright (C) 2005, 2008 Slava Pestov, Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors arrays calendar combinators generic init
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kernel math namespaces sequences heaps boxes threads
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quotations assocs math.order ;
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IN: alarms
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TUPLE: alarm
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{ quot callable initial: [ ] }
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{ time timestamp }
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interval
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{ entry box } ;
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<PRIVATE
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SYMBOL: alarms
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SYMBOL: alarm-thread
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: notify-alarm-thread ( -- )
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alarm-thread get-global interrupt ;
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ERROR: bad-alarm-frequency frequency ;
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: check-alarm ( frequency/f -- frequency/f )
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dup [ duration? ] [ not ] bi or [ bad-alarm-frequency ] unless ;
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: <alarm> ( quot time frequency -- alarm )
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check-alarm <box> alarm boa ;
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: register-alarm ( alarm -- )
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dup dup time>> alarms get-global heap-push*
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swap entry>> >box
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notify-alarm-thread ;
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: alarm-expired? ( alarm now -- ? )
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[ time>> ] dip before=? ;
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: reschedule-alarm ( alarm -- )
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dup [ swap interval>> time+ now max ] change-time register-alarm ;
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: call-alarm ( alarm -- )
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[ entry>> box> drop ]
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[ quot>> "Alarm execution" spawn drop ]
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[ dup interval>> [ reschedule-alarm ] [ drop ] if ] tri ;
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: (trigger-alarms) ( alarms now -- )
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over heap-empty? [
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2drop
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] [
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over heap-peek drop over alarm-expired? [
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over heap-pop drop call-alarm (trigger-alarms)
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] [
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2drop
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] if
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] if ;
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: trigger-alarms ( alarms -- )
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now (trigger-alarms) ;
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: next-alarm ( alarms -- timestamp/f )
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dup heap-empty?
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[ drop f ] [ heap-peek drop time>> ] if ;
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: alarm-thread-loop ( -- )
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alarms get-global
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dup next-alarm sleep-until
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trigger-alarms ;
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: cancel-alarms ( alarms -- )
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[
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heap-pop-all [ nip entry>> box> drop ] assoc-each
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] when* ;
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: init-alarms ( -- )
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alarms global [ cancel-alarms <min-heap> ] change-at
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[ alarm-thread-loop t ] "Alarms" spawn-server
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alarm-thread set-global ;
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[ init-alarms ] "alarms" add-init-hook
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PRIVATE>
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: add-alarm ( quot time frequency -- alarm )
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<alarm> [ register-alarm ] keep ;
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: later ( quot duration -- alarm )
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hence f add-alarm ;
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: every ( quot duration -- alarm )
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[ hence ] keep add-alarm ;
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: cancel-alarm ( alarm -- )
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entry>> [ alarms get-global heap-delete ] if-box? ;
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