template <class T> 

class CSyncClass : public T 

{ 

public: 

    CSyncClass()           { ::InitializeCriticalSection(&m_CritSectionStruct); }; 

    virtual ~CSyncClass() { ::DeleteCriticalSection(&m_CritSectionStruct); }; 

    

private: 

    CRITICAL_SECTION      m_CritSectionStruct; 

    

public: 

    inline void Lock()    { ::EnterCriticalSection(&m_CritSectionStruct); }; 

    inline void Unlock()  { ::LeaveCriticalSection(&m_CritSectionStruct); }; 

}; 

class CQueue 

{ 

    ... 

protected: 

    CSyncClass<CPtrList> m_Queue; 

    ... 

public: 

    void Queue(LPVOID pItem); 

    LPVOID Top(); 

    ... 

}; 



void CQueue::Queue(LPVOID pItem) 

{ 

    m_Queue.Lock(); 

    m_Queue.AddTail(pItem); 

    m_Queue.Unlock(); 

} 



LPVOID CQueue::Top() 

{ 

    LPVOID pItem = NULL; 

    m_Queue.Lock(); 

    if (!m_Queue.IsEmpty()) 

        pItem = m_Queue.RemoveHead(); 

    m_Queue.Unlock(); 

    

    return pItem; 

} 

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