typedef struct _ASYNC_INFO {
	HWND hWnd; 
	unsigned int wMsg;
	long lEvent;
} ASYNC_INFO;
typedef struct _EVENT_INFO {
	WSAEVENT hEventObject; 
	long lNetworkEvents;
} EVENT_INFO;
typedef struct _SOCK_OPT {
	int level;
	int optname;
	const char FAR * optval;
	int optlen;
} SOCK_OPT;

typedef struct _IO_CTL {
	LPVOID lpvInBuffer;
	DWORD cbInBuffer;
	LPVOID lpvOutBuffer;
	DWORD cbOutBuffer;
	LPDWORD lpcbBytesReturned;
	LPWSAOVERLAPPED lpOverlapped;
	LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine;
	LPWSATHREADID lpThreadId;
} IO_CTL;

typedef struct _SOCK_INFO
{
	SOCKET ProviderSocket;      // lower provider socket handle
	SOCKET LayeredSocket;       // app's socket handle
	DWORD  dwOutstandingAsync;  // count of outstanding async operations
	BOOL   bClosing;            // has the app closed the socket?

	volatile LONG  RefCount;    // How many threads are accessing this info?
	BOOL isUdp;

	ULONG  BytesSent;       // Byte counts
	ULONG  BytesRecv;
	HANDLE hIocp;           // associated with an IOCP?

	int LastError;           // Last error that occured on this socket

	HWND hWnd;                // Window (if any) associated with socket
	UINT uMsg;                // Message for socket events

	CRITICAL_SECTION   SockCritSec; // Synchronize access to this object

	PROVIDER *Provider;// Pointer to the provider from which socket was created

	LIST_ENTRY Link;
	UINT blockingType;	// socket bolckingType 0: blocking; 1:eventSelect; 2:asyncSelect
	ASYNC_INFO asyncSelectInfo;	// save socket asyncSelect handle
	EVENT_INFO eventSelectInfo;	// save socket eventSelect handle
	int* Nonblock;	// socket bolcking type
	SOCK_OPT opt;	// set socket opt params
	bool optState;	// is opt
	bool proxyState;	// use for udp; only udp sendto called set be true;then call recvfrom will check this value
	const struct sockaddr FAR * RemoteAddr;		// for udp called: connect->send->recv
	bool isConnected;	// check a socket is connected
	IO_CTL ioctl;	// wsaioctl params
	bool UdpTunnelReady;	// udp tunnel is ready

} SOCK_INFO;