考虑到客户特殊的需求，为该IOCP服务器添加另外一个功能，允许接收客户端指令，并针对指令对监控端进行交互，可以很到的达到基本不影响IOCP性能，同时还能无缝的结合监控端思路，抛出经过修改的代码出来，希望能给各位一点帮助。

DWORD __stdcall UDPServerThread(LPVOID Param) {   TIOCP* pThis = (TIOCP*)Param;   struct timeval waitTime;                 fd_set readFds;   int socketFds;   int err;   int nLength;   char data[UDP_BUFFER];   FD_ZERO(&readFds);   FD_SET(pThis->socketID, &readFds);   int time = 0;   while(pThis->StartUDPThread){     memset(data,0,UDP_BUFFER);     waitTime.tv_sec = 5L;     waitTime.tv_usec = 0L;     FD_ZERO(&readFds);     FD_SET(pThis->socketID, &readFds);     socketFds = select(0, &readFds, NULL, NULL, &waitTime);     if(SOCKET_ERROR == socketFds){       closesocket(pThis->socketID);       WSACleanup();       cout << "Select Error " << pThis->socketID << endl;       return 0;     }     if(0 == socketFds){       cout << "Select Time Out........." << time++ << endl;       cout << "pConnectionList" << pThis->pConnectionList.size() << endl;       cout << "plistHandle" << pThis->plistHandle.size() << endl;       cout << "pFreeHandle" << pThis->pFreeHandle.size() << endl;       cout << "pFreeIO" << pThis->pFreeIO.size() << endl;       continue;     }     nLength = sizeof(struct sockaddr);     err = recvfrom(pThis->socketID, data, UDP_BUFFER, 0,                 (struct sockaddr*)&pThis->mySockaddr, &nLength);     pThis->ParseData(data);   }   return TRUE; }