1 ! Copyright (C) 2005, 2008 Slava Pestov, Doug Coleman.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors assocs boxes calendar
4 combinators.short-circuit fry heaps init kernel math.order
5 namespaces quotations threads math system ;
9 { quot callable initial: [ ] }
19 : notify-alarm-thread ( -- )
20 alarm-thread get-global interrupt ;
22 : normalize-argument ( obj -- nanoseconds )
23 >duration duration>nanoseconds >integer ;
25 : <alarm> ( quot start interval -- alarm )
27 swap dup [ normalize-argument ] when >>interval
28 swap dup [ normalize-argument nano-count + ] when >>start
32 : register-alarm ( alarm -- )
33 [ dup start>> alarms get-global heap-push* ]
37 : alarm-expired? ( alarm n -- ? )
40 : reschedule-alarm ( alarm -- )
41 dup interval>> nano-count + >>start register-alarm ;
43 : call-alarm ( alarm -- )
45 [ dup interval>> [ reschedule-alarm ] [ drop ] if ]
46 [ quot>> "Alarm execution" spawn drop ] tri ;
48 : (trigger-alarms) ( alarms n -- )
52 over heap-peek drop over alarm-expired? [
53 over heap-pop drop call-alarm (trigger-alarms)
59 : trigger-alarms ( alarms -- )
60 nano-count (trigger-alarms) ;
62 : next-alarm ( alarms -- nanos/f )
63 dup heap-empty? [ drop f ] [ heap-peek drop start>> ] if ;
65 : alarm-thread-loop ( -- )
67 dup next-alarm sleep-until
70 : cancel-alarms ( alarms -- )
72 heap-pop-all [ nip entry>> box> drop ] assoc-each
76 alarms [ cancel-alarms <min-heap> ] change-global
77 [ alarm-thread-loop t ] "Alarms" spawn-server
78 alarm-thread set-global ;
80 [ init-alarms ] "alarms" add-startup-hook
84 : add-alarm ( quot start interval -- alarm )
85 <alarm> [ register-alarm ] keep ;
87 : later ( quot duration -- alarm ) f add-alarm ;
89 : every ( quot duration -- alarm ) dup add-alarm ;
91 : cancel-alarm ( alarm -- )
92 entry>> [ alarms get-global heap-delete ] if-box? ;