进一步理解IOCP的Get和Post

进一步理解IOCP的Get和Post

// filename: CEIocpSocket.cpp
// author: enic
// date: 2013-03-30

#include "CEIocpSocket.h"

#include "CESpinLock.h"

HANDLE CEIocpSocket::ms_hIoComplete = NULL;

CEIocpSocket::~CEIocpSocket()
{
}

 

 

 

 

 

 

E_DWORD CEIocpSocket::InitIocpWorkThreads()
{
    if (ms_hIoComplete != false)
    {
        return E_ERR;
    }

    SYSTEM_INFO nativeSysInfo;
    ::GetNativeSystemInfo(&nativeSysInfo);

    E_SIZE nThreadNum = nativeSysInfo.dwNumberOfProcessors*2;

    ms_hIoComplete = ::CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, NULL, nThreadNum);
    Thread_EIocpSocket_StartParameter startParameter;
    memset(&startParameter, NULL, sizeof(startParameter));
    startParameter.hIoComplete = ms_hIoComplete;

    for (E_SIZE n = 0; n < nThreadNum; ++n)
    {
        boost::thread newThread(
            boost::bind(&CEIocpSocket::Thread_EIocpSocket, startParameter));

        EIOCP_OVERLAPPED* pIocpOverlapped = new EIOCP_OVERLAPPED;
        memset(pIocpOverlapped, NULL, sizeof(*pIocpOverlapped));
        pIocpOverlapped->pEIocpSocket = reinterpret_cast<CEIocpSocket*>(n);
        // PostQueuedCompletionStatus和GetQueuedCompletionStatus只是传递pIocpOverlapped这地址的值
        // 所以对这个地址的内存管理需要程序员自己实现
        BOOL bResult = PostQueuedCompletionStatus(ms_hIoComplete, n, 0, pIocpOverlapped);
        if (FALSE == bResult)
        {
                std::cout << __FUNCTION__ << std::endl;
                std::cout << "error: " << ::GetLastError() << std::endl;
        }

    }

    return E_OK;
}

void CEIocpSocket::Thread_EIocpSocket(Thread_EIocpSocket_StartParameter pStartParameter)
{
    std::cout << __FUNCTION__ << std::endl;

    DWORD nLenTransferred = 0;
    CEIocpSocket* pEIocpSocket = NULL;
    EIOCP_OVERLAPPED* pIocpOverlapped = NULL;

    ULONG_PTR ulKey = NULL;
    OVERLAPPED* pOverlapped;

    while(true)
    {
        BOOL bResult =
            GetQueuedCompletionStatus(pStartParameter.hIoComplete,
            &nLenTransferred, 
            &ulKey,
            &pOverlapped,
            INFINITE);
        pEIocpSocket = reinterpret_cast<CEIocpSocket*>(ulKey);
        pIocpOverlapped = static_cast<EIOCP_OVERLAPPED*>(pOverlapped);
        if(FALSE == bResult)
        {
            DWORD ewLastError = ::GetLastError();
            if(WAIT_TIMEOUT == ewLastError)
            {
                continue;
            }
            else
            {
                std::cout << __FUNCTION__ << std::endl;
                std::cout << "error: " << ewLastError << std::endl;
                return;
            }
        }
        else
        {
            std::cout << nLenTransferred << std::endl;
            std::cout << reinterpret_cast<int>(pIocpOverlapped->pEIocpSocket) << std::endl;
            delete pIocpOverlapped;
        }
    }
}