IOCP例子
//#include "stdafx.h"
#include <iostream>
using namespace std;
#include <cstdio>
#include <WINSOCK2.H>
#include <windows.h>
#include <stdio.h>
#define PORT 5150
#define DATA_BUFSIZE 8192
typedef struct
{
OVERLAPPED OVerlapped;
WSABUF DATABuf;
CHAR Buffer[DATA_BUFSIZE];
DWORD BytesSend,BytesRecv;
}PER_IO_OPERATION_DATA, *LPPER_IO_OPERATION_DATA;
typedef struct
{
SOCKET Socket;
}PER_HANDLE_DATA, *LPPER_HANDLE_DATA;
DWORD WINAPI ServerWorkerThread(LPVOID ComlpetionPortID);
int main(int argc, char* argv[])
{
SOCKADDR_IN InternetAddr;
SOCKET Listen,Accept;
HANDLE CompetionPort;
SYSTEM_INFO SystenInfo;
LPPER_HANDLE_DATA PerHandleData;
LPPER_IO_OPERATION_DATA PerIOData;
int i;
DWORD RecvBytes;
DWORD Flags;
DWORD ThreadID;
WSADATA wsadata;
DWORD Ret;
if (Ret = WSAStartup(0x2020,&wsadata) != 0)
{
printf("WSAStartup failed with error %d/n",Ret);
return 0;
}
//打开一个空的完成端口
if ((CompetionPort = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0)) == NULL)
{
printf("CreateIoCompletionPort failed with error %d/n",GetLastError());
return 0;
}
GetSystemInfo(&SystenInfo);
// 开启cpu个数的2倍个的线程
for (i=0;i < SystenInfo.dwNumberOfProcessors*2;i++)
{
HANDLE ThreadHandle;
//创建服务器工作线程，并且向线程传送完成端口
if ((ThreadHandle = CreateThread(NULL,0,ServerWorkerThread,CompetionPort,0,&ThreadID))== NULL)
{
printf("CreateThread failed with error %d/n" ,GetLastError());
return 0;
}
CloseHandle(ThreadHandle);
}
//打开一个服务器socket
if ((Listen = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED))== INVALID_SOCKET)
{
printf("WSASocket()failed with error %d/n", WSAGetLastError());
return 0;
}
InternetAddr.sin_family = AF_INET;
InternetAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
InternetAddr.sin_port = htons(PORT);
if (bind(Listen,(LPSOCKADDR)&InternetAddr,sizeof(InternetAddr))== SOCKET_ERROR)
{
printf("bind failed with error %d/n",WSAGetLastError());
return 0;
}
if (listen(Listen,5)== SOCKET_ERROR)
{
printf("listen failed with error %d/n",WSAGetLastError());
return 0;
}
//接收连接并且分发给完成端口
while (TRUE)
{
if ((Accept = WSAAccept(Listen,NULL,NULL,NULL,0))== SOCKET_ERROR)
{
printf("WSAAccept failed with error %d/n",WSAGetLastError());
return 0;
}
//创建与套接字相关的套接字信息结构
if ((PerHandleData = (LPPER_HANDLE_DATA)GlobalAlloc(GPTR,sizeof(PER_HANDLE_DATA)))== NULL)
{
printf("GlobalAlloc failed with error %d/n",GetLastError());
return 0;
}
// Associate the accepted socket with the original completion port.
printf("Socket number %d connected/n",Accept);
PerHandleData->Socket = Accept;//结构中存入接收的套接字
//与我们的创建的那个完成端口关联起来,将关键项也与指定的一个完成端口关联
if ((CreateIoCompletionPort((HANDLE)Accept,CompetionPort,(DWORD)PerHandleData,0))== NULL)
{
printf("CreateIoCompletionPort failed with error%d/n",GetLastError());
return 0;
}
// 创建同下面的WSARecv调用相关的IO套接字信息结构体
if ((PerIOData = (LPPER_IO_OPERATION_DATA)GlobalAlloc(GPTR,sizeof(PER_IO_OPERATION_DATA)))= NULL)
{
printf("GlobalAloc failed with error %d/n",GetLastError());
return 0;
}
ZeroMemory(&(PerIOData->OVerlapped),sizeof(OVERLAPPED));
PerIOData->BytesRecv = 0;
PerIOData->BytesSend = 0;
PerIOData->DATABuf.len = DATA_BUFSIZE;
PerIOData->DATABuf.buf = PerIOData->Buffer;
Flags = 0;
if (WSARecv(Accept,&(PerIOData->DATABuf),1,&RecvBytes,&Flags,&(PerIOData->OVerlapped),NULL)== SOCKET_ERROR)
{
if (WSAGetLastError()!= ERROR_IO_PENDING)
{
printf("WSARecv()failed with error %d/n",WSAGetLastError());
return 0;
}
}
}
return 0;
}
//工作线程
DWORD WINAPI ServerWorkerThread(LPVOID ComlpetionPortID)
{
HANDLE ComplectionPort = (HANDLE)ComlpetionPortID;
DWORD BytesTransferred;
LPOVERLAPPED Overlapped;
LPPER_HANDLE_DATA PerHandleData;
LPPER_IO_OPERATION_DATA PerIOData;
DWORD SendBytes, RecvBytes;
DWORD Flags;
while (TRUE)
{
if (GetQueuedCompletionStatus(ComplectionPort,&BytesTransferred,(LPDWORD)&PerHandleData,(LPOVERLAPPED*)&PerIOData,INFINITE)== 0)
{
printf("GetQueuedCompletionStatus failed with error%d/n",GetLastError());
return 0;
}
//首先检查套接字上是否发生错误，如果发生了则关闭套接字并且清除同套节字相关的SOCKET_INFORATION 结构体
if (BytesTransferred == 0)
{
printf("Closing Socket %d/n",PerHandleData->Socket);
if (closesocket(PerHandleData->Socket)== SOCKET_ERROR)
{
printf("closesocket failed with error %d/n",WSAGetLastError());
return 0;
}
GlobalFree(PerHandleData);
GlobalFree(PerIOData);
continue;
}
//检查BytesRecv域是否等于0，如果是，说明WSARecv调用刚刚完成，可以用从己完成的WSARecv调用返回的BytesTransferred值更新BytesRecv域
if (PerIOData->BytesRecv == 0)
{
PerIOData->BytesRecv = BytesTransferred;
PerIOData->BytesSend = 0;
}
else
{
PerIOData->BytesRecv +=BytesTransferred;
}
//
if (PerIOData->BytesRecv > PerIOData->BytesSend)
{
//发布另一个WSASend()请求，因为WSASendi 不能确保发送了请的所有字节，继续WSASend调用直至发送完所有收到的字节
ZeroMemory(&(PerIOData->OVerlapped),sizeof(OVERLAPPED));
PerIOData->DATABuf.buf = PerIOData->Buffer + PerIOData->BytesSend;
PerIOData->DATABuf.len = PerIOData->BytesRecv - PerIOData->BytesSend;
if (WSASend(PerHandleData->Socket,&(PerIOData->DATABuf),1,&SendBytes,0,&(PerIOData->OVerlapped),NULL)==SOCKET_ERROR )
{
if (WSAGetLastError()!= ERROR_IO_PENDING)
{
printf("WSASend()fialed with error %d/n",WSAGetLastError());
return 0;
}
}
}
else
{
PerIOData->BytesRecv = 0;
//Now that is no more bytes to send post another WSARecv()request
//现在己经发送完成
Flags = 0;
ZeroMemory(&(PerIOData->OVerlapped),sizeof(OVERLAPPED));
PerIOData->DATABuf.buf = PerIOData->Buffer;
PerIOData->DATABuf.len = DATA_BUFSIZE;
if (WSARecv(PerHandleData->Socket,&(PerIOData->DATABuf),1,&RecvBytes,&Flags,&(PerIOData->OVerlapped),NULL)== SOCKET_ERROR)
{
if (WSAGetLastError()!= ERROR_IO_PENDING)
{
printf("WSARecv()failed with error %d/n",WSAGetLastError());
return 0;
}
}
}
}
}