TnbExchanger.h

[詳解]

#pragma once
#include "TnbSync.h"
 
 
 
namespace TNB
{
 
 
 
template<typename TYP>
class CExchangerT
{
    LONG            m_lCount;       
    CSyncSemaphore  m_syncSema;     
    CSyncEvent      m_syncEvent1;   
    CSyncEvent      m_syncEvent2;   
    volatile TYP    m_tParam1st;    
    volatile TYP    m_tParam2nd;    
 
public:
 
    CExchangerT(void)
        : m_lCount(0), m_syncSema(NULL, 2), m_syncEvent1(false, true), m_syncEvent2(false, true)
    {
    }
 
    TYP Exchange(const TYP& t)
    {
        EXCLUSIVE(&m_syncSema);
        TYP r;
        LONG l = ::InterlockedIncrement(&m_lCount);
        if ( l == 1 )
        {
            m_tParam1st = t;
            m_syncEvent2.Lock();
            m_syncEvent1.Unlock();
            r = m_tParam2nd;
        }
        else
        {
            m_lCount = 0;
            m_tParam2nd = t;
            m_syncEvent2.Unlock();
            m_syncEvent1.Lock();
            r = m_tParam1st;
        }
        return r;
    }
};
 
 
 
}; // TNB