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Length: 3552 (0xde0)
Notes: Mikados TextFile, Mikados_K
Names: »WAITNG«
└─⟦38ff28550⟧ Bits:30004682 Pascal Standard Assembler til MIKADOS
└─ ⟦this⟧ »WAITNG«
;*************************************************************
;* PASCAL STANDARD ASSEMBLER PACKAGE. *
;* *
;* (C) 1980 DANSK DATA ELEKTRONIK APS. *
;*************************************************************
;
;*************************************************************
;* FUNCTION NAME: WAITNG *
;*************************************************************
;
; CT 07-MAY-1980
;
;=============================================================
; DESCRIPTION:
; THIS FUNCTIONS TESTS IF THERE ARE ANY MESSAGES WAITING ON
; THE MAIN SEMAPHORE OF THE CALLING PROCESS.
; PLEASE REFER TO THE PASCAL STANDARD ASSEMBLER PACKAGE MANUAL
; SECTION 4.3 FOR DETAILS.
;
;-------------------------------------------------------------
; STACK CONTENTS ON ENTRY: I I
; I---------------I
; I RETURN ADR. I
; I---------------I
; I DUMMY ELEMENT I
; I---------------I
; I DUMMY ELEMENT I
; I---------------I
; I DUMMY ELEMENT I
; I---------------I
; I DUMMY ELEMENT I
; I---------------I
; I I
;-------------------------------------------------------------
; STACK CONTENTS ON EXIT: I I
; I---------------I
; I TRUE / FALSE I
; I---------------I
; I I
;=============================================================
SKIP
SYMB
WAITNG::
;
;CLEAN UP ON STACK
;
POP B ;BC:=RETURN ADDRESS
POP D ;REMOVE
POP D ; DUMMY
POP D ; ELEMENT
POP D ; FROM STACK
;
;GET VALUE FIELD OF MAIN SEMAPHORE
;
LHLD RUNN ;HL->PCB OF CALLING PROCESS
LXI D,KOSEM
DAD D ;HL->ADDRESS OF MAIN SEMAPHORE
MOV E,M ;DE->
INX H ; MAIN
MOV D,M ; SEMAPHORE
LDAX D ;A:=VALUE FIELD OF SEMAPHORE
CPI 1 ;ANY MESSAGE WAITING
JZ OK ;YES
;
;NO MESSAGE WAITING, RETURN VALUE:=FALSE
;
LXI D,0 ;DE:=FALSE
PUSH D ;STACK RETURN VALUE
PUSH B ;RESTORE RETURN ADDRESS
RET
;
;MESSAGE WAITING, RETURN VALUE:=TRUE
;
OK: LXI D,1 ;DE:=TRUE
PUSH D ;STACK RETURN VALUE
PUSH B ;RESTORE RETURN ADDRESS
RET
END