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Friday 5 February 2010

Queue ADT

  • Like stacks, queues are also lists.
  • In queue insertion is done at one end(Rear) and deletion is done at the other end(Front).
  • The removal of elements from a queue is possible in the same order in which the insertion of elements is made in to the queue. 
  • Since it is always the first  item to be put in to the queue that is the first item to be removed a queue is a First In First Out(FIFO) data structure

                                           A   B   C    D   E   F
                                            |                            |
                                        Front                      Rear
  • Queues are used in network programming,operating systems and other situations in which many different processes must share resources such as CPU time.
Basic Queue Operation: 
  • Elements can only be added to the rear of the queue and removed from the front of the queue. 
  • Insertion of an element in to a queue is known as enqueue and removing an element from the queue is known as dequeue. 
      1. Insertion operation in a queue(enqueue)  
  • Inserts an element at the end of the queue.
  • When a new element is added to the queue the rear pointer is incremented

      2. Deletion operation in a queue(dequeue)
  • removes and returns the element at the front of the queue. 
  • When a dequeue operation is performed the element pointed by the front pointer is removed and the front pointer is incremented.

Applications of Queue:
  1. Waiting Lists
  2. Access to shared resources (eg,Printer)
  3. Multiprogramming 
  4. Round Robin Scheduling 



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