92 lines
2.3 KiB
Factor
Executable File
92 lines
2.3 KiB
Factor
Executable File
! 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: arrays calendar combinators generic init kernel math
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namespaces sequences heaps boxes threads debugger quotations
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assocs math.order ;
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IN: alarms
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TUPLE: alarm quot time interval entry ;
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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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: check-alarm
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dup duration? over not or [ "Not a duration" throw ] unless
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over timestamp? [ "Not a timestamp" throw ] unless
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pick callable? [ "Not a quotation" throw ] unless ; inline
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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 alarm-time alarms get-global heap-push*
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swap alarm-entry >box
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notify-alarm-thread ;
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: alarm-expired? ( alarm now -- ? )
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>r alarm-time r> before=? ;
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: reschedule-alarm ( alarm -- )
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dup alarm-time over alarm-interval time+
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over set-alarm-time
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register-alarm ;
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: call-alarm ( alarm -- )
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dup alarm-entry box> drop
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dup alarm-quot "Alarm execution" spawn drop
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dup alarm-interval [ reschedule-alarm ] [ drop ] if ;
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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 alarm-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 alarm-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 dt -- alarm )
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from-now f add-alarm ;
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: every ( quot dt -- alarm )
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[ from-now ] keep add-alarm ;
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: cancel-alarm ( alarm -- )
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alarm-entry [ alarms get-global heap-delete ] if-box? ;
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