queue.cpp

在Linux底下用QtDesigner开发的一个进程同步例子。基本思想是设计一个缓冲区（循环队列）

#include "queue.h"
HQueue::HQueue(int sz):rear(0),front(0),m(sz){//tag(0),
//structure function,to create a empty Queue that have the max size of m
   Q =new Circle[m];                                            //create Queue space
   Q_ASSERT (Q != 0 );   
   //if(Q==0)
       //return;
	   //assert:if the alloc storage succeed 
}

void HQueue::EnQueue(Circle& item){
//insert function
   //assert(!IsFull());   
   Q_ASSERT(!IsFull());
   rear = (rear + 1) % m;                                     //
   Q[rear] = item;                                            //
   //tag = 1; 
   
   
}

Circle HQueue::DeQueue(){
//
   //assert(!IsEmpty());   
     Q_ASSERT(!IsEmpty());
      front = (front + 1) % m;                                   //
      //tag = 0;                                                   //
      return Q[front];    
    
}

Circle HQueue::GetFront(){
//
   Q_ASSERT(!IsEmpty());                               //
   return Q[(front + 1) % m] ;
      
}