mirror of
https://github.com/forth-ev/VolksForth.git
synced 2024-11-03 07:05:57 +00:00
120 lines
7.3 KiB
Forth
120 lines
7.3 KiB
Forth
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\ *** Block No. 0 Hexblock 0
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\\ Multitasker 11Nov86
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Dieses File enthaelt den Multitasker des volksFORTHs.
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Er ist ein Round-Robin-Multitasker, d.h. jede Task behaelt
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die Kontrolle ueber den Prozessor solange, bis sie sie
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ausdruecklich abgibt.
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Hintergrundtasks im volksFORTH koennen durch Semaphore geordnet
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auf den Massenspeicher und auf den Drucker zugreifen.
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In Verbindung mit dem Printer-Interface ist es moeglich
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Files im Hintergrund auszudrucken. (SPOOL)
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\ *** Block No. 1 Hexblock 1
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\ Multitasker Loadscreen 27Jun86 20Nov87
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Onlyforth
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\needs multitask 1 +load
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02 05 +thru \ Tasker
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\ *** Block No. 2 Hexblock 2
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\ stop singletask multitask 28Aug86 20Nov87
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Code stop UP lhld 0 ( nop ) M mvi
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Label taskpause
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IP push RP lhld H push UP lhld 6 D lxi D dad xchg
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H L mov SP dad xchg E M mov H inx D M mov
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UP lhld H inx pchl
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end-code
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: singletask [ ' pause @ ] Literal ['] pause ! ;
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: multitask [ taskpause ] Literal ['] pause ! ;
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\ *** Block No. 3 Hexblock 3
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\ pass activate 28Aug86
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: pass ( n0 ... nr-1 Taddr r -- )
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BEGIN [ rot ( Trick !! ) ]
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swap $F7 over c! \ awake Task ( rst 6 )
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r> -rot \ Stack: IP r addr
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8 + >r \ s0 of Task
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r@ 2+ @ swap \ Stack: IP r0 r
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2+ 2* \ bytes on Taskstack incl. r0 & IP
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r@ @ over - \ new SP
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dup r> 2- ! \ into Ssave
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swap bounds ?DO I ! 2 +LOOP ; restrict
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: activate ( Taddr -- )
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0 [ -rot ( Trick !! ) ] REPEAT ; restrict
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\ *** Block No. 4 Hexblock 4
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\ sleep wake taskerror 28Aug86 20Nov87
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: sleep ( Taddr -- ) $00 ( nop ) swap c! ;
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: wake ( Taddr -- ) $F7 ( rst 6 ) swap c! ;
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| : taskerror ( string -- )
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standardi/o singletask ." Task error : " count type
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multitask stop ;
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\ *** Block No. 5 Hexblock 5
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\ Task 20Nov87
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: Task ( rlen slen -- )
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0 Constant here 2- >r \ addr of task constant
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here -rot \ here for Task dp
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even allot even \ allot dictionary area
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here r@ ! \ set task constant addr
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up@ here $100 cmove \ init user area
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here dup $C300 , \ nop-jmp opcode to sleep task
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up@ 2+ dup @ , ! \ link task
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r> , \ spare used for pointer to header
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dup 6 - dup , , \ ssave and s0
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2dup + , \ here + rlen = r0
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rot , \ dp
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under + dp ! 0 , \ allot rstack
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['] taskerror [ ' errorhandler >body c@ ] Literal rot + ! ;
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\ *** Block No. 6 Hexblock 6
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\ rendezvous 's tasks 27Jun86 20Nov87
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: rendezvous ( semaphoraddr -- ) dup unlock pause lock ;
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| : statesmart state @ IF [compile] Literal THEN ;
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: 's ( Taddr -- adr.of.tasks.userarea )
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' >body c@ + statesmart ; immediate
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: tasks ( -- ) ." Main " cr up@ dup 2+ @
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BEGIN 2dup - WHILE dup 4+ @ body> >name .name
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dup c@ 0= ( nop ) IF ." sleeping" THEN cr
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2+ @ REPEAT 2drop ;
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