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212 lines
6.3 KiB
Plaintext
212 lines
6.3 KiB
Plaintext
;
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; File: Queue.a
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;
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; Contains: Macintosh Core Utility Routines -- Enqueue, Dequeue, InitQueue
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;
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; Written by: Andy Hertzfeld 23-APR-81
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;
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; Copyright: © 1982-1993 by Apple Computer, Inc., all rights reserved.
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;
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; Change History (most recent first):
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;
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; <SM3> 9/12/93 pdw Added EnqueueHead routine.
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; <SM2> 5/21/92 kc Append "Trap" to the names of Enqueue and Dequeue to avoid name
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; conflict with the glue.
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; <3> 8/30/91 JSM Cleanup header.
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; <2> 6/12/91 LN Changed #include 'HardwareEqu.a' to 'HardwarePrivateEqu.a'
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; <1.1> 11/10/88 CCH Fixed Header.
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; <1.0> 11/9/88 CCH Adding to EASE.
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; <¥1.1> 9/23/88 CCH Got rid of inc.sum.d and empty nFiles
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; <1.0> 2/10/88 BBM Adding file for the first time into EASEÉ
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; <C206> 10/9/86 bbm Modified to mpw aincludes.
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; 2/19/86 BBM Made some modifications to work under MPW
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; 7/24/85 RDC Changed interrupt level settings to use equate Added spearate
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; include statement for HWequ file (no longer in systlqk.sym)
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; 1/31/85 LAK Removed unsightly RTE's (for 68020 compatibility).
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; 1/23/85 LAK Adapted for new equate files.
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; 8/8/83 LAK made code-savings changes suggested in walkthru.
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; 2/23/83 LAK changed a Move to a MoveQ, a Cmp to a Cmp.L.
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; 5/2/82 LAK removed set and reset of queue-in-use flags since disabling
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; interrupts already guaranteed exclusion.
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;
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BLANKS ON
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STRING ASIS
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LOAD 'StandardEqu.d'
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INCLUDE 'HardwarePrivateEqu.a'
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;
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;-----------------------------------------------------------------------
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;
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; ENQUEUE -- add a queue element to a queue.
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; On entry,
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; A0 points to the queue element
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; A1 points to the queue header
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;
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; All registers are preserved; there are no error conditions.
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;
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; The element is inserted at the end of the list.
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;
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; We don't check to see if the element is already in the queue because
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; this would be slow and if the caller needs such functionality, it should
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; do it itself.
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;
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;-----------------------------------------------------------------------
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;
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ENQUEUETRAP PROC EXPORT
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MOVE SR,-(SP) ;preserve status
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ADDQ #2,A1 ;point to QHead
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ORI #HiIntMask,SR ;disable interrupts for exclusion <24Jul85>
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CLR.L QLINK(A0) ;clear the link of the element
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TST.L (A1)+ ;anything in the queue? (QHead)
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BNE.S DOQINSERT ;if so, skip ahead
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;
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; the queue is empty so make the head and tail point to the new element
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;
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MOVE.L A0,(A1) ;QTail
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MOVE.L A0,-(A1) ;QHead
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BRA.S ENQDONE
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;
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; insert the element at the end of the list
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;
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DOQINSERT MOVE.L A2,-(SP) ;preserve A2
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MOVE.L (A1),A2 ;get ptr to old QTail
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MOVE.L A0,QLINK(A2) ;update its link
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MOVE.L A0,(A1) ;update QTail
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MOVE.L (SP)+,A2 ;restore A2
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SUBQ #4,A1 ;point to QHead
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;
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ENQDONE SUBQ #2,A1 ;restore A1
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MOVE (SP)+, SR ;restore status and go home
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RTS
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ENDP
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;-----------------------------------------------------------------------
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; EnqueueHead -- add a queue element to the head of a queue.
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;-----------------------------------------------------------------------
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;
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; Entry:
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; A0 - points to the queue element
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; A1 - points to the queue header
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; All registers are preserved; there are no error conditions.
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;
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; The element is inserted at the beginning of the list.
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;
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;-----------------------------------------------------------------------
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;
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ENQUEUEHEAD PROC EXPORT
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MOVE SR, -(SP) ;preserve status
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ADDQ #2, A1 ;point to qHead
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ORI #$0700, SR ;disable interrupts for exclusion
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TST.L (A1)+ ;anything in the queue? (qHead)
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BNE.S @doQinsert ;if so, skip ahead
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;
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; the queue is empty so make the head and tail point to the new element
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;
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MOVE.L A0, (A1) ;qTail
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MOVE.L A0, -(A1) ;qHead
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CLR.L qLink(A0) ;clear the link of the element
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BRA.S @enQdone
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;
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; insert the element at the head of the list
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;
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@doQinsert MOVE.L A2, -(SP) ;preserve A2
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MOVE.L -(A1), A2 ;get ptr to old qHead
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MOVE.L A2, qLink(A0) ;update new link to old head
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MOVE.L A0, (A1) ;update qHead
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MOVE.L (SP)+, A2 ;restore A2
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;
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@enQdone SUBQ #2, A1 ;restore A1
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MOVE (SP)+, SR ;restore status and go home
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RTS
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ENDP
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;
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;-----------------------------------------------------------------------
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;
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; DEQUEUE -- delete an element from a queue. On entry, A0 points to the queue
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; element while A1 points to the queue header. On exit, D0 contains an error
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; code. The only possible error is if the queue element is not present in the
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; queue. All registers except D0 are preserved.
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;
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;-----------------------------------------------------------------------
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;
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DEQUEUETRAP PROC EXPORT
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MOVE SR,-(SP) ;preserve status
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MOVEM.L A2-A3,-(SP) ;preserve work registers
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ORI #HiIntMask,SR ;disable interrupts for exclusion <24Jul85>
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;
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MOVE.L QHEAD(A1),A2 ;start searching at the head
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MOVE.L A2,A3
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;
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QDELSRCH CMP.L A3,A0 ;is this the one?
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BEQ.S GODEL ;(Escher and Bach)if so, go delete it
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;
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MOVE.L A3,A2 ;update previous pointer
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MOVE.L QLINK(A2),A3 ;follow the link
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CMP.L QTAIL(A1),A2 ;have we reached the tail?
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BNE.S QDELSRCH
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;
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; the queue element can't be found so it's an error
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;
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MOVEQ #QERR,D0
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BRA.S QDONE1
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;
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; we found the element so delete it
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;
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GODEL CMP.L A2,A3 ;deleting the first element?
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BNE.S QUNLINK ;if not, skip
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;
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; special case to delete the first element in the queue
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;
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MOVE.L QLINK(A2),QHEAD(A1)
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BNE.S QDELDONE ;was it the only element?
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CLR.L QTAIL(A1) ;if so, clear the tail too
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;
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QDELDONE MOVEQ #0,D0 ;clear the error code
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QDONE1 MOVEM.L (SP)+,A2-A3 ;restore work registers
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MOVE (SP)+, SR ;restore status and go home
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RTS
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;
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; delete for the general case
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;
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QUNLINK MOVE.L QLINK(A3),QLINK(A2) ;unlink it from the chain
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CMP.L QTAIL(A1),A3 ;was it the tail?
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BNE.S QDELDONE ;if not we're done
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MOVE.L A2,QTAIL(A1) ;update tail pointer
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BRA.S QDELDONE
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ENDP
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;------------------------------------------------------------------
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;
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; INITQUEUE -- initialize the queue header pointed to by A1
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;
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;------------------------------------------------------------------
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INITQUEUE PROC EXPORT
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CLR.W (A1)+ ;QFlags
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CLR.L (A1)+ ;qHead
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CLR.L (A1) ;qTail
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SUBQ #6,A1 ;preserve A1
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RTS
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ENDP
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END
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