VolksForth/sources/cpm/tasker.fth

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