A2osX/SYS/KERNEL.S.TSK.txt

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PR#3
PREFIX /A2OSX.BUILD
LOMEM $A00
INC 1
AUTO 6
*--------------------------------------
* TSK.TskMgrRun
*--------------------------------------
TSK.TskMgrRun >LDYAI TskMgr.Table+S.PS skip PS 0
>STYA pPs
lda TskMgr.Count
sta TskMgr.Idx
.1 dec TskMgr.Idx skip PS 0
beq .8
lda (pPs) get S.PS.F
bit #S.PS.F.INUSE In use ?
beq .7
bit #S.PS.F.HOLD Waiting for Another Task to Terminate?
beq .2
ldy #S.PS.CPID
lda (pPs),y
jsr K.GetPSByIDA
bcc .7 yes, running....
lda (pPs) get S.PS.F
and #$FF^S.PS.F.HOLD unmark as HOLD
sta (pPs)
.2 jsr PS.Select
lda (pPS)
bit #S.PS.F.INIT
bne .30
bit #S.PS.F.SLEEP Is this PS sleeping?
beq .3 no, call TSKMGR.RUN
jsr TSK.PSWakeUp
bra .4
.30 and #$FF^S.PS.F.INIT unmark as INIT
sta (pPS)
ldx #TSKMGR.INIT
.HS 2C BIT abs
.3 ldx #TSKMGR.RUN
.31 jsr pCodeJmp Call INIT/RUN function
.4 bcc .7 INIT/RUN said CS=QUIT?
pha save RC
ldy #S.PS.PPID Notify Parent Process for exit code...
lda (pPs),y
jsr K.GetPSByIDA will set ZPPtr1 if success
bcs .5 parent is dead.....skipping...
lda (ZPPtr1) Parent PS is HOLD?
bit #S.PS.F.HOLD
beq .5 no...
eor #S.PS.F.HOLD yes, release hold...
sta (ZPPtr1)
pla ...probably waiting for this PS to terminate....
ldy #S.PS.RC give it RC
sta (ZPPtr1),y
.HS B0 BCS
.5 pla
.6 ldx #TSKMGR.QUIT yes, quit this process
jsr pCodeJmp Call QUIT function
ldy #S.PS.PID
lda (pPs),y
jsr PS.FreeA
.7 lda pPs
clc
adc #S.PS
sta pPs
bcc .1
inc pPs+1
bcs .1 Always
.8 clc
rts
*--------------------------------------
TSK.PSWakeUp and #$FF^S.PS.F.SLEEP unmark as SLEEP
sta (pPS)
ldy #S.PS.PC
lda (pPs),y
sec Advance PC by one as it was saved by a JSR
adc pCode setup by PS.Select
sta .1+1
iny
lda (pPs),y
adc pCode+1
sta .1+2
.1 jmp $FFFF
*--------------------------------------
* TSK.DispatchEvents
* IN:
* OUT:
* CS: Not Dispatched
* CC: Event Cleared
*--------------------------------------
TSK.DispatchEvents
>LDYAI TskMgr.Table+S.PS
>STYA pPs
lda TskMgr.Count Number of actual processes...
sta TskMgr.Idx ...to give event list
.1 dec TskMgr.Idx skip PS 0
beq .9
lda (pPs) get S.PS.F
bpl .4
* bit #S.PS.F.INUSE In use ?
* beq .4
bit #S.PS.F.INIT+S.PS.F.HOLD Init or Waiting for Another Task to Terminate?
bne .4
bit #S.PS.F.EVENT Accept Events ?
beq .4
jsr PS.Select
lda #EvtMgr.Table
sta pEvent Select first event in list
lda EVTMGR.COUNT
sta TSKMGR.EVENTCNT
.2 lda (pEvent) Empty event, select next
beq .3
lda (pCode)
cmp #H.BIN.HEADER.BIN65
bne *
ldx #TSKMGR.DOEVENT
jsr pCodeJmp Call DOEVENT function
bcs .3 not for this PS, try next event in list
jsr EVT.DestroyEvent this PS handled the EVT, destroy it...
lda EVTMGR.COUNT
beq .8 no more event, exit
.3 dec TSKMGR.EVENTCNT
beq .4 all EVT submitted to this PS, try other PS
lda pEvent try next EVT to this PS
clc
adc #S.EVT
sta pEvent
bra .2
.4 lda pPs go to next PS in PS list
clc
adc #S.PS
sta pPs
bcc .1
inc pPs+1
bne .1 always
.8 clc
rts
.9 sec
rts
*--------------------------------------
TSK.TskMgrQuit clc
rts
*--------------------------------------
TskMgr.Idx .BS 1
TSKMGR.EVENTCNT .BS 1
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.TSK
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM