C++代码
// write by larry
// 2009-8-20
// This is a server using overlapped IO(completion routine).
#include "stdafx.h"
#include <WINSOCK2.H>
#include <stdio.h>
#pragma comment(lib, "ws2_32.lib")
#define PORT 5150
#define MSGSIZE 1024
typedef struct
{
WSAOVERLAPPED overlap;
WSABUF Buffer;
char szMessage[MSGSIZE];
DWORD NumberOfBytesRecvd;
DWORD Flags;
SOCKET sClient;
} PER_IO_OPERATION_DATA, *LPPER_IO_OPERATION_DATA;
int g_iTotalConn = 0;
SOCKET g_CliSocketArr[MAXIMUM_WAIT_OBJECTS];
WSAEVENT g_CliEventArr[MAXIMUM_WAIT_OBJECTS];
LPPER_IO_OPERATION_DATA g_pPerIoDataArr[MAXIMUM_WAIT_OBJECTS];
DWORD WINAPI WorkerThread(LPVOID lpParam);
void CALLBACK CompletionRoutine(DWORD dwError, DWORD cbTransferred, LPWSAOVERLAPPED lpOverlapped, DWORD dwFlags);
SOCKET g_sNewClientConnection;
BOOL g_bNewConnectionArrived = FALSE;
int main(int argc, char* argv[])
{
WSADATA wsaData;
SOCKET sListen;
SOCKADDR_IN local, client;
DWORD dwThreadId;
int iAddrSize = sizeof(SOCKADDR_IN);
// Initialize windows socket library
WSAStartup(0x0202, &wsaData);
// Create listening socket
sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
// Bind
local.sin_family = AF_INET;
local.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
local.sin_port = htons(PORT);
bind(sListen, (sockaddr*)&local, sizeof(SOCKADDR_IN));
// Listen
listen(sListen, 3);
// Create worker thread
CreateThread(NULL, 0, WorkerThread, NULL, 0, &dwThreadId);
while (TRUE)
{
// Accept a connection
g_sNewClientConnection = accept(sListen, (sockaddr*)&client, &iAddrSize);
g_bNewConnectionArrived = TRUE;
printf("Accepted client:%s:%d\n", inet_ntoa(client.sin_addr), ntohs(client.sin_port));
}
return 0;
}
DWORD WINAPI WorkerThread(LPVOID lpParam)
{
LPPER_IO_OPERATION_DATA lpPerIOData = NULL;
while (TRUE)
{
if (g_bNewConnectionArrived)
{
// Launch an asynchronous operation for new arrived connection
lpPerIOData = (LPPER_IO_OPERATION_DATA)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
sizeof(PER_IO_OPERATION_DATA));
lpPerIOData->Buffer.len = MSGSIZE;
lpPerIOData->Buffer.buf = lpPerIOData->szMessage;
lpPerIOData->sClient = g_sNewClientConnection;
WSARecv(lpPerIOData->sClient,
&lpPerIOData->Buffer,
1,
&lpPerIOData->NumberOfBytesRecvd,
&lpPerIOData->Flags,
&lpPerIOData->overlap,
CompletionRoutine);
g_bNewConnectionArrived = FALSE;
}
SleepEx(1000, TRUE);
}
return 0;
}
void CALLBACK CompletionRoutine(DWORD dwError, DWORD cbTransferred, LPWSAOVERLAPPED lpOverlapped, DWORD dwFlags)
{
LPPER_IO_OPERATION_DATA lpPerIOData = (LPPER_IO_OPERATION_DATA)lpOverlapped;
if (dwError != 0 || cbTransferred == 0)
{
// Connection was closed by client
closesocket(lpPerIOData->sClient);
HeapFree(GetProcessHeap(), 0, lpPerIOData);
}
else
{
lpPerIOData->szMessage[cbTransferred] = '\0';
send(lpPerIOData->sClient, lpPerIOData->szMessage, cbTransferred, 0);
// Launch another asynchronous operation
memset(&lpPerIOData->overlap, 0, sizeof(WSAOVERLAPPED));
lpPerIOData->Buffer.len = MSGSIZE;
lpPerIOData->Buffer.buf = lpPerIOData->szMessage;
WSARecv(lpPerIOData->sClient,
&lpPerIOData->Buffer,
1,
&lpPerIOData->NumberOfBytesRecvd,
&lpPerIOData->Flags,
&lpPerIOData->overlap,
CompletionRoutine);
}
}
// writeby larry
//2009-8-20
// Thisis a server using overlapped IO(completion routine).
#include"stdafx.h"
#include<WINSOCK2.H>
#include<stdio.h>
#pragmacomment(lib, "ws2_32.lib")
#definePORT 5150
#defineMSGSIZE 1024
typedefstruct
{
WSAOVERLAPPED overlap;
WSABUF Buffer;
char szMessage[MSGSIZE];
DWORD NumberOfBytesRecvd;
DWORD Flags;
SOCKET sClient;
}PER_IO_OPERATION_DATA, *LPPER_IO_OPERATION_DATA;
int g_iTotalConn = 0;
SOCKET g_CliSocketArr[MAXIMUM_WAIT_OBJECTS];
WSAEVENT g_CliEventArr[MAXIMUM_WAIT_OBJECTS];
LPPER_IO_OPERATION_DATAg_pPerIoDataArr[MAXIMUM_WAIT_OBJECTS];
DWORDWINAPI WorkerThread(LPVOID lpParam);
voidCALLBACK CompletionRoutine(DWORD dwError, DWORD cbTransferred, LPWSAOVERLAPPEDlpOverlapped, DWORD dwFlags);
SOCKETg_sNewClientConnection;
BOOLg_bNewConnectionArrived = FALSE;
intmain(int argc, char* argv[])
{
WSADATA wsaData;
SOCKET sListen;
SOCKADDR_IN local, client;
DWORD dwThreadId;
int iAddrSize = sizeof(SOCKADDR_IN);
// Initialize windows socket library
WSAStartup(0x0202, &wsaData);
// Create listening socket
sListen = socket(AF_INET, SOCK_STREAM,IPPROTO_TCP);
// Bind
local.sin_family = AF_INET;
local.sin_addr.S_un.S_addr =htonl(INADDR_ANY);
local.sin_port = htons(PORT);
bind(sListen, (sockaddr*)&local,sizeof(SOCKADDR_IN));
// Listen
listen(sListen, 3);
// Create worker thread
CreateThread(NULL, 0, WorkerThread, NULL, 0,&dwThreadId);
while (TRUE)
{
// Accept a connection
g_sNewClientConnection = accept(sListen,(sockaddr*)&client, &iAddrSize);
g_bNewConnectionArrived = TRUE;
printf("Acceptedclient:%s:%d\n", inet_ntoa(client.sin_addr), ntohs(client.sin_port));
}
return 0;
}
DWORDWINAPI WorkerThread(LPVOID lpParam)
{
LPPER_IO_OPERATION_DATA lpPerIOData = NULL;
while (TRUE)
{
if (g_bNewConnectionArrived)
{
// Launch an asynchronous operation fornew arrived connection
lpPerIOData =(LPPER_IO_OPERATION_DATA)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
sizeof(PER_IO_OPERATION_DATA));
lpPerIOData->Buffer.len = MSGSIZE;
lpPerIOData->Buffer.buf =lpPerIOData->szMessage;
lpPerIOData->sClient =g_sNewClientConnection;
WSARecv(lpPerIOData->sClient,
&lpPerIOData->Buffer,
1,
&lpPerIOData->NumberOfBytesRecvd,
&lpPerIOData->Flags,
&lpPerIOData->overlap,
CompletionRoutine);
g_bNewConnectionArrived = FALSE;
}
SleepEx(1000, TRUE);
}
return 0;
}
voidCALLBACK CompletionRoutine(DWORD dwError, DWORD cbTransferred, LPWSAOVERLAPPEDlpOverlapped, DWORD dwFlags)
{
LPPER_IO_OPERATION_DATA lpPerIOData =(LPPER_IO_OPERATION_DATA)lpOverlapped;
if (dwError != 0 || cbTransferred == 0)
{
// Connection was closed by client
closesocket(lpPerIOData->sClient);
HeapFree(GetProcessHeap(), 0,lpPerIOData);
}
else
{
lpPerIOData->szMessage[cbTransferred] ='\0';
send(lpPerIOData->sClient,lpPerIOData->szMessage, cbTransferred, 0);
// Launch another asynchronous operation
memset(&lpPerIOData->overlap, 0,sizeof(WSAOVERLAPPED));
lpPerIOData->Buffer.len = MSGSIZE;
lpPerIOData->Buffer.buf =lpPerIOData->szMessage;
WSARecv(lpPerIOData->sClient,
&lpPerIOData->Buffer,
1,
&lpPerIOData->NumberOfBytesRecvd,
&lpPerIOData->Flags,
&lpPerIOData->overlap,
CompletionRoutine);
}
}
用完成例程来实现重叠I/O比用事件通知简单得多。在这个模型中，主线程只用不停的接受连接即可；辅助线程判断有没有新的客户端连接被建立，如果有，就为那个客户端套接字激活一个异步的WSARecv操作，然后调用SleepEx使线程处于一种可警告的等待状态，以使得I/O完成后CompletionROUTINE可以被内核调用。如果辅助线程不调用SleepEx，则内核在完成一次I/O操作后，无法调用完成例程（因为完成例程的运行应该和当初激活WSARecv异步操作的代码在同一个线程之内）。
完成例程内的实现代码比较简单，它取出接收到的数据，然后将数据原封不动的发送给客户端，最后重新激活另一个WSARecv异步操作。注意，在这里用到了“尾随数据”。我们在调用WSARecv的时候，参数lpOverlapped实际上指向一个比它大得多的结构PER_IO_OPERATION_DATA，这个结构除了WSAOVERLAPPED以外，还被我们附加了缓冲区的结构信息，另外还包括客户端套接字等重要的信息。这样，在完成例程中通过参数lpOverlapped拿到的不仅仅是WSAOVERLAPPED结构，还有后边尾随的包含客户端套接字和接收数据缓冲区等重要信息。这样的C语言技巧在我后面介绍完成端口的时候还会使用到。