A Circular Queue Data Structure - Oakland University

A Circular Queue Data Structure - Oakland University

A Circular Queue Data Structure Lecture L4.8 A Circular Queue qbuff front = rear qbuff min front min 38 rear 45 max (a) empty max (b) Containing 2 values inc rear if rear > max then rear = min if front = rear then queue is full dec rear if rear < min then rear = max

else store value at rear Algorithm to store a value in the circular queue if front = rear then queue is empty (set false flag) else inc front if front > max then front = min read byte at front set true flag Algorithm to check queue for a value ; A circular queue qsize front rear qmin qmax qbuff equ dw dw dw dw rmb 16 0 0 0 0 qsize ldd std

std std addd std rts #qbuff front rear qmin #(qsize-1) qmax qbuff front = rear qbuff min front min 38 rear 45 initq max (a) max (b) ; Store qstore psha

ldd addd cpd bls ldd qs1 std cpd bne subd cpd bhs ldd qs2 std pula bra qs3 pula ldx staa qs4 rts A in queue ;save A rear #1 qmax qs1 qmin rear front qs3 #1 qmin qs2 qmax rear

qs4 rear 0,x ;inc rear ;if rear > qmax ; rear = qmin ;if rear = front ; queue if full ; dec rear ; if rear < qmin ; rear = qmax ; pop A ; and return ;else ; store A at rear ; Check queue ; if queue is empty, carry = 1 ; else, carry = 0 and A = value taken from queue checkq ldd front cpd rear ;if front = rear bne cq0 ; queue is empty

orcc #$01 ; set carry flag bra cq2 cq0 ldd front ;else addd #1 ; inc front cpd qmax bls cq1 ; if front > qmax ldd qmin cq1 std front ; front = qmin ldx front ldaa 0,x ; A = @front andcc #$fe ; clear carry flag cq2 rts

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