Winsock IOCP模型

最新推荐文章于 2016-08-30 21:56:31 发布

feimashenhua

最新推荐文章于 2016-08-30 21:56:31 发布

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分类专栏： C++ 文章标签： socket null extension thread buffer io

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本文介绍了一个使用IOCP（I/O完成端口）实现的并发服务器示例，该服务器能够高效处理多个客户端连接请求。通过使用WSAAsyncSelect、WSARecv、WSASend等函数，实现了异步接受、读取和写入操作。

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// IOCP2.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <WinSock2.h>
#include <MSWSock.h>
#include <Windows.h>
#include <process.h>
#pragma comment(lib, "WS2_32.lib")
#define MAX_BUFFER 256
#define MAX_TIMEOUT 1000
#define MAX_SOCKET 1024
#define MAX_THREAD 64
#define MAX_ACCEPT 5
typedef enum _OPERATION_INFO_
{
OP_NULL,
OP_ACCEPT,
OP_READ,
OP_WRITE
}OPERATIONINFO;
typedef struct _PER_HANDLE_DATA_
{
public :
_PER_HANDLE_DATA_()
{
clean();
}
~_PER_HANDLE_DATA_()
{
clean();
}
protected :
void clean()
{
sock = INVALID_SOCKET;
memset(&addr, 0, sizeof (addr));
addr.sin_addr.S_un.S_addr = INADDR_ANY;
addr.sin_port = htons(0);
addr.sin_family = AF_INET;
}
public :
SOCKET sock;
SOCKADDR_IN addr;
}PERHANDLEDATA, *PPERHANDLEDATA;
typedef struct _PER_IO_DTATA_
{
public :
_PER_IO_DTATA_()
{
clean();
}
~_PER_IO_DTATA_()
{
clean();
}
void clean()
{
ZeroMemory(&ol, sizeof (ol));
memset(buf, 0, sizeof (buf));
sAccept = INVALID_SOCKET;
sListen = INVALID_SOCKET;
wsaBuf.buf = buf;
wsaBuf.len = MAX_BUFFER;
opType = OP_NULL;
}
public :
WSAOVERLAPPED ol;
SOCKET sAccept; // Only valid with AcceptEx
SOCKET sListen; // Only valid with AcceptEx
WSABUF wsaBuf;
char buf[MAX_BUFFER];
OPERATIONINFO opType;
}PERIODATA, *PPERIODATA;
HANDLE hThread[MAX_THREAD] = {0};
PERIODATA* pAcceptData[MAX_ACCEPT] = {0};
int g_nThread = 0;
BOOL g_bExitThread = FALSE;
LPFN_ACCEPTEX lpfnAcceptEx = NULL;
LPFN_GETACCEPTEXSOCKADDRS lpfnGetAcceptExSockAddrs = NULL;
GUID GuidAcceptEx = WSAID_ACCEPTEX;
GUID GuidGetAcceptExSockAddrs = WSAID_GETACCEPTEXSOCKADDRS;
unsigned __stdcall ThreadProc(LPVOID lParam);
BOOL PostAccept(PERIODATA* pIoData);
int _tmain( int argc, _TCHAR* argv[])
{
WORD wVersionRequested = MAKEWORD(2, 2);
WSADATA wsaData;
if (0 != WSAStartup(wVersionRequested, &wsaData))
{
printf("WSAStartup failed with error code: %d/n" , GetLastError());
return EXIT_FAILURE;
}
if (2 != HIBYTE(wsaData.wVersion) || 2 != LOBYTE(wsaData.wVersion))
{
printf("Socket version not supported./n" );
WSACleanup();
return EXIT_FAILURE;
}
// Create IOCP
HANDLE hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, NULL, 0);
if (NULL == hIOCP)
{
printf("CreateIoCompletionPort failed with error code: %d/n" , WSAGetLastError());
WSACleanup();
return EXIT_FAILURE;
}
// Create worker thread
SYSTEM_INFO si = {0};
GetSystemInfo(&si);
for ( int i = 0; i < ( int )si.dwNumberOfProcessors+2; i++)
{
hThread[g_nThread] = (HANDLE )_beginthreadex(NULL, 0, ThreadProc, ( LPVOID )hIOCP, 0, NULL);
if (NULL == hThread[g_nThread])
{
printf("_beginthreadex failed with error code: %d/n" , GetLastError());
continue ;
}
++g_nThread;
if (g_nThread > MAX_THREAD)
{
break ;
}
}
// Create listen SOCKET
SOCKET sListen = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 0, WSA_FLAG_OVERLAPPED);
if (INVALID_SOCKET == sListen)
{
printf("WSASocket failed with error code: %d/n" , WSAGetLastError());
goto EXIT_CODE;
}
// Associate SOCKET with IOCP
if (NULL == CreateIoCompletionPort(( HANDLE )sListen, hIOCP, NULL, 0))
{
printf("CreateIoCompletionPort failed with error code: %d/n" , WSAGetLastError());
if (INVALID_SOCKET != sListen)
{
closesocket(sListen);
sListen = INVALID_SOCKET;
}
goto EXIT_CODE;
}
// Bind SOCKET
SOCKADDR_IN addr;
memset(&addr, 0, sizeof (addr));
addr.sin_family = AF_INET;
addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1" );
addr.sin_port = htons(5050);
if (SOCKET_ERROR == bind(sListen, (LPSOCKADDR)&addr, sizeof (addr)))
{
printf("bind failed with error code: %d/n" , WSAGetLastError());
if (INVALID_SOCKET != sListen)
{
closesocket(sListen);
sListen = INVALID_SOCKET;
}
goto EXIT_CODE;
}
// Start Listen
if (SOCKET_ERROR == listen(sListen, 200))
{
printf("listen failed with error code: %d/n" , WSAGetLastError());
if (INVALID_SOCKET != sListen)
{
closesocket(sListen);
sListen = INVALID_SOCKET;
}
goto EXIT_CODE;
}
printf("Server start, wait for client to connect .../n" );
DWORD dwBytes = 0;
if (SOCKET_ERROR == WSAIoctl(sListen, SIO_GET_EXTENSION_FUNCTION_POINTER, &GuidAcceptEx, sizeof (GuidAcceptEx), &lpfnAcceptEx,
sizeof (lpfnAcceptEx), &dwBytes, NULL, NULL))
{
printf("WSAIoctl failed with error code: %d/n" , WSAGetLastError());
if (INVALID_SOCKET != sListen)
{
closesocket(sListen);
sListen = INVALID_SOCKET;
}
goto EXIT_CODE;
}
if (SOCKET_ERROR == WSAIoctl(sListen, SIO_GET_EXTENSION_FUNCTION_POINTER, &GuidGetAcceptExSockAddrs,
sizeof (GuidGetAcceptExSockAddrs), &lpfnGetAcceptExSockAddrs, sizeof (lpfnGetAcceptExSockAddrs),
&dwBytes, NULL, NULL))
{
printf("WSAIoctl failed with error code: %d/n" , WSAGetLastError());
if (INVALID_SOCKET != sListen)
{
closesocket(sListen);
sListen = INVALID_SOCKET;
}
goto EXIT_CODE;
}
// Post MAX_ACCEPT accept
for ( int i=0; i<MAX_ACCEPT; i++)
{
pAcceptData[i] = new PERIODATA;
pAcceptData[i]->sListen = sListen;
PostAccept(pAcceptData[i]);
}
// After 1 hour later, Server shutdown.
Sleep(1000 * 60 *60);
EXIT_CODE:
g_bExitThread = TRUE;
PostQueuedCompletionStatus(hIOCP, 0, NULL, NULL);
WaitForMultipleObjects(g_nThread, hThread, TRUE, INFINITE);
for ( int i = 0; i < g_nThread; i++)
{
CloseHandle(hThread[g_nThread]);
}
for ( int i=0; i<MAX_ACCEPT; i++)
{
if (pAcceptData[i])
{
delete pAcceptData[i];
pAcceptData[i] = NULL;
}
}
if (INVALID_SOCKET != sListen)
{
closesocket(sListen);
sListen = INVALID_SOCKET;
}
CloseHandle(hIOCP); // Close IOCP
WSACleanup();
return 0;
}
BOOL PostAccept(PERIODATA* pIoData)
{
if (INVALID_SOCKET == pIoData->sListen)
{
return FALSE;
}
DWORD dwBytes = 0;
pIoData->opType = OP_ACCEPT;
pIoData->sAccept = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 0, WSA_FLAG_OVERLAPPED);
if (INVALID_SOCKET == pIoData->sAccept)
{
printf("WSASocket failed with error code: %d/n" , WSAGetLastError());
return FALSE;
}
if (FALSE == lpfnAcceptEx(pIoData->sListen, pIoData->sAccept, pIoData->wsaBuf.buf, pIoData->wsaBuf.len - (( sizeof (SOCKADDR_IN)+16)*2),
sizeof (SOCKADDR_IN)+16, sizeof (SOCKADDR_IN)+16, &dwBytes, &(pIoData->ol)))
{
if (WSA_IO_PENDING != WSAGetLastError())
{
printf("lpfnAcceptEx failed with error code: %d/n" , WSAGetLastError());
return FALSE;
}
}
return TRUE;
}
unsigned __stdcall ThreadProc(LPVOID lParam)
{
HANDLE hIOCP = ( HANDLE )lParam;
PERHANDLEDATA* pPerHandleData = NULL;
PERIODATA* pPerIoData = NULL;
WSAOVERLAPPED* lpOverlapped = NULL;
DWORD dwTrans = 0;
DWORD dwFlags = 0;
while (!g_bExitThread)
{
BOOL bRet = GetQueuedCompletionStatus(hIOCP, &dwTrans, ( PULONG_PTR )&pPerHandleData, &lpOverlapped, MAX_TIMEOUT);
if (!bRet)
{
// Timeout and exit thread
if (WAIT_TIMEOUT == GetLastError())
{
continue ;
}
// Error
printf("GetQueuedCompletionStatus failed with error: %d/n" , GetLastError());
continue ;
}
else
{
pPerIoData = CONTAINING_RECORD(lpOverlapped, PERIODATA, ol);
if (NULL == pPerIoData)
{
// Exit thread
break ;
}
if ((0 == dwTrans) && (OP_READ == pPerIoData->opType || OP_WRITE == pPerIoData->opType))
{
// Client leave.
printf("Client: <%s : %d> leave./n" , inet_ntoa(pPerHandleData->addr.sin_addr), ntohs(pPerHandleData->addr.sin_port));
closesocket(pPerHandleData->sock);
delete pPerHandleData;
delete pPerIoData;
continue ;
}
else
{
switch (pPerIoData->opType)
{
case OP_ACCEPT: // Accept
{
SOCKADDR_IN* remote = NULL;
SOCKADDR_IN* local = NULL;
int remoteLen = sizeof (SOCKADDR_IN);
int localLen = sizeof (SOCKADDR_IN);
lpfnGetAcceptExSockAddrs(pPerIoData->wsaBuf.buf, pPerIoData->wsaBuf.len - ((sizeof (SOCKADDR_IN)+16)*2),
sizeof (SOCKADDR_IN)+16, sizeof (SOCKADDR_IN)+16, (LPSOCKADDR*)&local, &localLen, (LPSOCKADDR*)&remote, &remoteLen);
printf("Client <%s : %d> come in./n" , inet_ntoa(remote->sin_addr), ntohs(remote->sin_port));
printf("Recv Data: <%s : %d> %s./n" , inet_ntoa(remote->sin_addr), ntohs(remote->sin_port), pPerIoData->wsaBuf.buf);
if (NULL != pPerHandleData)
{
delete pPerHandleData;
pPerHandleData = NULL;
}
pPerHandleData = new PERHANDLEDATA;
pPerHandleData->sock = pPerIoData->sAccept;
PERHANDLEDATA* pPerHandle = new PERHANDLEDATA;
pPerHandle->sock = pPerIoData->sAccept;
PERIODATA* pPerIo = new PERIODATA;
pPerIo->opType = OP_WRITE;
strcpy_s(pPerIo->buf, MAX_BUFFER, pPerIoData->buf);
DWORD dwTrans = strlen(pPerIo->buf);
memcpy(&(pPerHandleData->addr), remote, sizeof (SOCKADDR_IN));
// Associate with IOCP
if (NULL == CreateIoCompletionPort(( HANDLE )(pPerHandleData->sock), hIOCP, ( ULONG_PTR )pPerHandleData, 0))
{
printf("CreateIoCompletionPort failed with error code: %d/n" , GetLastError());
closesocket(pPerHandleData->sock);
delete pPerHandleData;
continue ;
}
// Post Accept
memset(&(pPerIoData->ol), 0, sizeof (pPerIoData->ol));
PostAccept(pPerIoData);
// Post Receive
DWORD dwFlags = 0;
if (SOCKET_ERROR == WSASend(pPerHandle->sock, &(pPerIo->wsaBuf), 1,
&dwTrans, dwFlags, &(pPerIo->ol), NULL))
{
if (WSA_IO_PENDING != WSAGetLastError())
{
printf("WSASend failed with error code: %d/n" , WSAGetLastError());
closesocket(pPerHandle->sock);
delete pPerHandle;
delete pPerIo;
continue ;
}
}
}
break ;
case OP_READ: // Read
printf("recv client <%s : %d> data: %s/n" , inet_ntoa(pPerHandleData->addr.sin_addr), ntohs(pPerHandleData->addr.sin_port), pPerIoData->buf);
pPerIoData->opType = OP_WRITE;
memset(&(pPerIoData->ol), 0, sizeof (pPerIoData->ol));
if (SOCKET_ERROR == WSASend(pPerHandleData->sock, &(pPerIoData->wsaBuf), 1, &dwTrans, dwFlags, &(pPerIoData->ol), NULL))
{
if (WSA_IO_PENDING != WSAGetLastError())
{
printf("WSASend failed with error code: %d./n" , WSAGetLastError());
continue ;
}
}
break ;
case OP_WRITE: // Write
{
pPerIoData->opType = OP_READ;
dwFlags = 0;
memset(&(pPerIoData->ol), 0, sizeof (pPerIoData->ol));
memset(pPerIoData->buf, 0, sizeof (pPerIoData->buf));
pPerIoData->wsaBuf.buf = pPerIoData->buf;
dwTrans = pPerIoData->wsaBuf.len = MAX_BUFFER;
if (SOCKET_ERROR == WSARecv(pPerHandleData->sock, &(pPerIoData->wsaBuf), 1, &dwTrans, &dwFlags, &(pPerIoData->ol), NULL))
{
if (WSA_IO_PENDING != WSAGetLastError())
{
printf("WSARecv failed with error code: %d./n" , WSAGetLastError());
continue ;
}
}
}
break ;
default :
break ;
}
}
}
}
return 0;
}