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Lecture13W_F - Queue Data Structure FIFO queue   Queue...

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Page 1 of 2 Queue Data Structure FIFO queue Queue buffer —memory space where queue elements are stored. Operations - Enqueue —insert something into a queue. - Dequeue —remove something from a queue. - First item enqueued is first item dequeued. - Enqueue and dequeue work on opposite ends of queue. Management data - Front/head of queue—location of next item to be removed. - Back/tail of queue—location where next item can be inserted. - Full/empty status of queue Number of items in queue. Maximum capacity of queue. Implementation details - Circular queue—queue insertion/deletion advance forward in memory to end of buffer and then wrap around to beginning. Queue insertion/deletion advance forward (toward higher memory address) in queue buffer. After enqueue/dequeue at last buffer position, next enqueue/dequeue at first buffer position. - Queue management record IN_PTR = Address of location where next item to be inserted. (.W) OUT_PTR = Address of location where next item to be removed. (.W) BUF_STRT = Address of beginning of queue buffer. (.W)
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