7種網絡編程I/O模型代碼實現實例

部分代碼參考《[WINDOWS網絡與通信程序設計].王豔平》，網絡中一些I/O模型的代碼都沒有對socket是否可寫做過深入研究，我這邊會提供一些解決方法。

阻塞模式下，send會發生阻塞（非阻塞模式下send返回WSAEWOULDBLOCK錯誤，重疊I/O下表現爲投遞的發送請求一直無法完成）的情況一般可以分爲3種 :

1, 服務器雖然發送了大量數據，但客戶端並未調用recv函數去接。

2，網絡狀況不佳，發送緩衝區中的數據一直發不出去。

3，發送數據量很大，如下載功能，協議發送數據的速度比不上send函數將數據拷貝到發送緩衝區的速度。

對於1,2情況，我們似乎可以直接關閉套接字，讓客戶端重新請求。但對於3，卻不行。而且實際操作過程中，我們無法區分是1,2,還是3，我們能做的是儘量去保證發送的正確性。當然防止1情況或者2情況中長時間網絡不暢，可以設定超時。若socket一直處於不可寫狀態超過1分鐘，那麼就關閉套接字。在最後的IOCP模型中就加入了這種超時機制。其他模型若要加入，可參考它來做。

一，基本的阻塞模型

[cpp] view plain copy print ?

#include <WinSock2.h>
#include <Windows.h>
#include <stdio.h>
#pragma comment(lib,"Ws2_32.lib")
DWORD WINAPI WorkThread(void* param)
{
SOCKET* psClient = (SOCKET*)param;
char buf[4096];
while(true)
{
int len = recv(*psClient,buf,4096,0);
if(len <= 0)
{
printf("recv失敗！%d\n",WSAGetLastError());
Sleep(5000);
break;
}
buf[len] = '\0';
printf("收到數據：%s\n",buf);
}
closesocket(*psClient);
delete psClient;
return 0;
}
int main()
{
WSAData wsaData;
if(0 != WSAStartup(MAKEWORD(2,2),&wsaData))
{
printf("WSAStartup失敗！\n",WSAGetLastError());
Sleep(5000);
return 0;
}
USHORT nPort = 3456;
SOCKET sListen = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(nPort);
sin.sin_addr.S_un.S_addr = INADDR_ANY;
if(SOCKET_ERROR == ::bind(sListen,(sockaddr*)&sin,sizeof(sin)))
{
printf("bind失敗！%d\n",WSAGetLastError());
Sleep(5000);
return -1;
}
::listen(sListen,5);
while(true)
{
sockaddr_in addrRemote;
int nAddrLen = sizeof(addrRemote);
SOCKET *psClient = new SOCKET;
*psClient = accept(sListen,(sockaddr*)&addrRemote,&nAddrLen);
HANDLE hThread = CreateThread(NULL,0,WorkThread,psClient,0,NULL);
CloseHandle(hThread);
}
closesocket(sListen);
WSACleanup();
}

#include <WinSock2.h>
#include <Windows.h>
#include <stdio.h>

#pragma comment(lib,"Ws2_32.lib")

DWORD WINAPI WorkThread(void* param)
{
	SOCKET* psClient = (SOCKET*)param;
	char buf[4096];
	while(true)
	{
		int len = recv(*psClient,buf,4096,0);
		if(len <= 0)
		{
			printf("recv失敗！%d\n",WSAGetLastError());
			Sleep(5000);
			break;
		}
		buf[len] = '\0';
		printf("收到數據：%s\n",buf);
	}
	closesocket(*psClient);
	delete psClient;
	return 0;
}

int main()
{
	WSAData wsaData;
	if(0 != WSAStartup(MAKEWORD(2,2),&wsaData))
	{
		printf("WSAStartup失敗！\n",WSAGetLastError());
		Sleep(5000);
		return 0;
	}
	USHORT nPort = 3456;
	SOCKET sListen = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(nPort);
	sin.sin_addr.S_un.S_addr = INADDR_ANY;

	if(SOCKET_ERROR == ::bind(sListen,(sockaddr*)&sin,sizeof(sin)))
	{
		printf("bind失敗！%d\n",WSAGetLastError());
		Sleep(5000);
		return -1;
	}

	::listen(sListen,5);

	while(true)
	{
		sockaddr_in addrRemote;
		int nAddrLen = sizeof(addrRemote);
		SOCKET *psClient = new SOCKET;
		*psClient = accept(sListen,(sockaddr*)&addrRemote,&nAddrLen);
		HANDLE hThread = CreateThread(NULL,0,WorkThread,psClient,0,NULL);
		CloseHandle(hThread);
	}
	closesocket(sListen);
	WSACleanup();
}

二，無任何優化的非阻塞模型

[cpp] view plain copy print ?

#include <WinSock2.h>
#include <Windows.h>
#include <stdio.h>
#include <vector>
using namespace std;
#pragma comment(lib,"Ws2_32.lib")
CRITICAL_SECTION g_cs;
HANDLE g_StartEvent;
vector<SOCKET> g_vecClients;
int g_iVecSize = 0;
DWORD WINAPI WorkThread(void* param)
{
char buf[4096];
while(1)
{
if(g_vecClients.empty())
{
ResetEvent(g_StartEvent);
WaitForSingleObject(g_StartEvent,INFINITE);
}
EnterCriticalSection(&g_cs);
for(vector<SOCKET>::iterator it = g_vecClients.begin();it != g_vecClients.end();)
{
int len = recv(*it,buf,4096,0);
if(len == SOCKET_ERROR)
{
if(WSAEWOULDBLOCK != WSAGetLastError())
{
printf("recv Error:%d\n",WSAGetLastError());
closesocket(*it);
it = g_vecClients.erase(it);
}
else
{
printf("%d.",*it);
++it;
}
}
else
{
buf[len] = 0;
printf("收到數據: %s\n",buf);
++it;
}
}
LeaveCriticalSection(&g_cs);
Sleep(100);
}
return 0;
}
int main()
{
InitializeCriticalSectionAndSpinCount(&g_cs,4000);
g_StartEvent = CreateEvent(NULL,FALSE,FALSE,NULL);
WSAData wsaDate;
WSAStartup(MAKEWORD(2,2),&wsaDate);
USHORT nport = 3456;
u_long ul = 1;
SOCKET s = socket(AF_INET,SOCK_STREAM,0);
ioctlsocket(s,FIONBIO,&ul);
sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(nport);
sin.sin_addr.S_un.S_addr = ADDR_ANY;
if(SOCKET_ERROR == ::bind(s,(sockaddr*)&sin,sizeof(sin)))
{
return -1;
}
::listen(s,5);
HANDLE hThread = CreateThread(NULL,0,WorkThread,NULL,0,NULL);
CloseHandle(hThread);
while(true)
{
sockaddr_in addrRemote;
int nAddrLen = sizeof(addrRemote);
SOCKET sClient = accept(s,(sockaddr*)&addrRemote,&nAddrLen);
if(sClient != SOCKET_ERROR)
{
EnterCriticalSection(&g_cs);
g_vecClients.push_back(sClient);
LeaveCriticalSection(&g_cs);
if(g_vecClients.size() == 1)
SetEvent(g_StartEvent);
}
else if(WSAEWOULDBLOCK == WSAGetLastError())
{
printf(".");
Sleep(100);
}
else
{
printf("accept failed! %d\n",WSAGetLastError());
}
}
closesocket(s);
WSACleanup();
CloseHandle(g_StartEvent);
DeleteCriticalSection(&g_cs);
}

#include <WinSock2.h>
#include <Windows.h>
#include <stdio.h>
#include <vector>
using namespace std;

#pragma comment(lib,"Ws2_32.lib")

CRITICAL_SECTION g_cs;
HANDLE           g_StartEvent;
vector<SOCKET> g_vecClients;
int g_iVecSize = 0;
DWORD WINAPI WorkThread(void* param)
{
	char buf[4096];
	while(1)
	{
		if(g_vecClients.empty())
		{
			ResetEvent(g_StartEvent);
			WaitForSingleObject(g_StartEvent,INFINITE);
		}

		EnterCriticalSection(&g_cs);
		for(vector<SOCKET>::iterator it = g_vecClients.begin();it != g_vecClients.end();)
		{
			int len = recv(*it,buf,4096,0);
			if(len == SOCKET_ERROR)
			{
				if(WSAEWOULDBLOCK != WSAGetLastError())
				{
					printf("recv Error:%d\n",WSAGetLastError());
					closesocket(*it);
					it = g_vecClients.erase(it);
				}
				else
				{
					printf("%d.",*it);
					++it;
				}
			}
			else
			{
				buf[len] = 0;
				printf("收到數據: %s\n",buf);
				++it;
			}
		}
		LeaveCriticalSection(&g_cs);
		Sleep(100);

	}
	return 0;
}

int main()
{
	InitializeCriticalSectionAndSpinCount(&g_cs,4000);
	g_StartEvent = CreateEvent(NULL,FALSE,FALSE,NULL);

	WSAData wsaDate;
	WSAStartup(MAKEWORD(2,2),&wsaDate);
	USHORT nport = 3456;
	u_long ul = 1;
	SOCKET s = socket(AF_INET,SOCK_STREAM,0);
	ioctlsocket(s,FIONBIO,&ul);
	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(nport);
	sin.sin_addr.S_un.S_addr = ADDR_ANY;

	if(SOCKET_ERROR == ::bind(s,(sockaddr*)&sin,sizeof(sin)))
	{
		return -1;
	}

	::listen(s,5);

	HANDLE hThread = CreateThread(NULL,0,WorkThread,NULL,0,NULL);
	CloseHandle(hThread);

	while(true)
	{
		sockaddr_in addrRemote;
		int nAddrLen = sizeof(addrRemote);
		SOCKET sClient = accept(s,(sockaddr*)&addrRemote,&nAddrLen);
		if(sClient != SOCKET_ERROR)
		{
			EnterCriticalSection(&g_cs);
			g_vecClients.push_back(sClient);
			LeaveCriticalSection(&g_cs);
			if(g_vecClients.size() == 1)
				SetEvent(g_StartEvent);
		}
		else if(WSAEWOULDBLOCK == WSAGetLastError())
		{
			printf(".");
			Sleep(100);
		}
		else
		{
			printf("accept failed! %d\n",WSAGetLastError());
		}
	}
	closesocket(s);
	WSACleanup();
	CloseHandle(g_StartEvent);
	DeleteCriticalSection(&g_cs);
}

三，select模型

[cpp] view plain copy print ?

#include <WinSock2.h>
#include <Windows.h>
#include <MSWSock.h>
#include <stdio.h>
#include <map>
using namespace std;
#pragma comment(lib,"Ws2_32.lib")
#pragma comment(lib,"Mswsock.lib")
struct ThreadObj{
OVERLAPPED *pOl;
HANDLE s;
};
int g_iIndex = 0;
map<SOCKET,char*> g_map;
int main()
{
WSAData wsaData;
if(0 != WSAStartup(MAKEWORD(2,2),&wsaData))
{
printf("初始化失敗!%d\n",WSAGetLastError());
Sleep(5000);
return -1;
}
USHORT nport = 3456;
SOCKET sListen = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
u_long ul = 1;
ioctlsocket(sListen,FIONBIO,&ul);
sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(nport);
sin.sin_addr.S_un.S_addr = ADDR_ANY;
if(SOCKET_ERROR == bind(sListen,(sockaddr*)&sin,sizeof(sin)))
{
printf("bind failed!%d\n",WSAGetLastError());
Sleep(5000);
return -1;
}
listen(sListen,5);
//1)初始化一個套接字集合fdSocket，並將監聽套接字放入
fd_set fdSocket;
FD_ZERO(&fdSocket);
FD_SET(sListen,&fdSocket);
TIMEVAL time={1,0};
char buf[4096];
fd_set fdWrite;
FD_ZERO(&fdWrite);
while(true)
{
//2）將fdSocket的一個拷貝fdRead傳給select函數
fd_set fdRead = fdSocket;
fd_set fdTmp = fdWrite;
int nRetAll = 0;
if(fdTmp.fd_count > 0)
nRetAll = select(0,&fdRead,&fdTmp,NULL,NULL/*&time*/);//若不設置超時則select爲阻塞
else
nRetAll = select(0,&fdRead,NULL,NULL,NULL/*&time*/);
if(nRetAll > 0)
{
//3）通過將原來的fdSocket和被select處理過的fdRead進行比較，決定由哪些socket有數據可以讀取
for(int i=0;i<fdSocket.fd_count;i++)
{
if(FD_ISSET(fdSocket.fd_array[i],&fdRead))
{
if(fdSocket.fd_array[i] == sListen)
{
if(fdSocket.fd_count < FD_SETSIZE)
{
sockaddr_in addrRemote;
int nAddrLen = sizeof(addrRemote);
SOCKET sClient = accept(sListen,(sockaddr*)&addrRemote,&nAddrLen);
FD_SET(sClient,&fdSocket);
printf("接收到連接：(%s)\n",inet_ntoa(addrRemote.sin_addr));
}
else
{
printf("連接數量已達上限！\n");
continue;
}
}
else
{
int nRecv = recv(fdSocket.fd_array[i],buf,4096,0);
if(nRecv > 0)
{
buf[nRecv] = 0;
printf("收到數據：%s\n",buf);
int nRet = send(fdSocket.fd_array[i],buf,nRecv,0);
if(nRet <= 0)
{
SOCKET s = fdSocket.fd_array[i];
if(GetLastError() == WSAEWOULDBLOCK)
{
if(g_map.find(s) == g_map.end())
{
char* szTmp = new char[nRecv + 1];
strncpy(szTmp,buf,nRecv);
szTmp[nRecv] = 0;
g_map[s] = szTmp;
}
else
{
char* szOld = g_map[s];
char* szTmp2 = new char[strlen(szOld) + nRecv + 1];
strncpy(szTmp2,szOld,strlen(szOld));
strncpy(szTmp2 + strlen(szOld),buf,nRecv);
szTmp2[strlen(szOld) + nRecv] = 0;
delete [] szOld;
g_map[s] = szTmp2;
}
FD_SET(fdSocket.fd_array[i],&fdWrite);
}
else
{
closesocket(fdSocket.fd_array[i]);
if(g_map.find(s) != g_map.end())
{
if(g_map[s] != NULL)
delete [] g_map[s];
g_map.erase(s);
}
FD_CLR(fdSocket.fd_array[i],&fdSocket);
}
}
printf("發送了%d\n",nRet);
}
else
{
printf("1個Client已斷開\n");
closesocket(fdSocket.fd_array[i]);
FD_CLR(fdSocket.fd_array[i],&fdSocket);
}
}
}
if(FD_ISSET(fdSocket.fd_array[i],&fdTmp))
{
SOCKET s = fdSocket.fd_array[i];
if(g_map.find(s) != g_map.end())
{
char* szToSend = g_map[s];
int nToSend = strlen(szToSend);
int nRet = send(fdSocket.fd_array[i],szToSend,nToSend,0);
if(nRet <= 0)
{
if(GetLastError() == WSAEWOULDBLOCK)
{
//do nothing
}
else
{
closesocket(fdSocket.fd_array[i]);
if(g_map.find(s) != g_map.end())
{
if(g_map[s] != NULL)
delete [] g_map[s];
g_map.erase(s);
}
FD_CLR(fdSocket.fd_array[i],&fdSocket);
}
}
else if(nRet < nToSend)
{
printf("發送了%d/%d\n",nRet,nToSend);
nToSend -= nRet;
char* szTmp = new char[nToSend + 1];
strncpy(szTmp,szToSend + nRet,nToSend);
szTmp[nToSend] = 0;
delete [] szToSend;
g_map[s] = szTmp;
}
else
{
if(g_map[s] != NULL)
delete [] g_map[s];
g_map.erase(s);
FD_CLR(fdSocket.fd_array[i],&fdWrite);
}
printf("============================================發送了%d\n",nRet);
}
}
}
}
else if(nRetAll == 0)
{
printf("time out!\n");
}
else
{
printf("select error!%d\n",WSAGetLastError());
Sleep(5000);
break;
}
}
closesocket(sListen);
WSACleanup();
}

#include <WinSock2.h>
#include <Windows.h>
#include <MSWSock.h>
#include <stdio.h>
#include <map>
using namespace std;


#pragma comment(lib,"Ws2_32.lib")
#pragma comment(lib,"Mswsock.lib")


struct ThreadObj{
	OVERLAPPED *pOl;
	HANDLE s;
};


int g_iIndex = 0;
map<SOCKET,char*> g_map;


int main()
{
	WSAData wsaData;
	if(0 != WSAStartup(MAKEWORD(2,2),&wsaData))
	{
		printf("初始化失敗!%d\n",WSAGetLastError());
		Sleep(5000);
		return -1;
	}
	USHORT nport = 3456;
	SOCKET sListen = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	u_long ul = 1;
	ioctlsocket(sListen,FIONBIO,&ul);
	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(nport);
	sin.sin_addr.S_un.S_addr = ADDR_ANY;


	if(SOCKET_ERROR == bind(sListen,(sockaddr*)&sin,sizeof(sin)))
	{
		printf("bind failed!%d\n",WSAGetLastError());
		Sleep(5000);
		return -1;
	}


	listen(sListen,5);


	//1)初始化一個套接字集合fdSocket，並將監聽套接字放入
	fd_set fdSocket;
	FD_ZERO(&fdSocket);
	FD_SET(sListen,&fdSocket);
	TIMEVAL time={1,0};
	char buf[4096];
	fd_set fdWrite;
	FD_ZERO(&fdWrite);
	while(true)
	{
		//2）將fdSocket的一個拷貝fdRead傳給select函數
		fd_set fdRead = fdSocket;
		fd_set fdTmp = fdWrite;
		int nRetAll = 0;
		if(fdTmp.fd_count > 0)
			nRetAll = select(0,&fdRead,&fdTmp,NULL,NULL/*&time*/);//若不設置超時則select爲阻塞
		else
			nRetAll = select(0,&fdRead,NULL,NULL,NULL/*&time*/);
		if(nRetAll > 0)
		{
			//3）通過將原來的fdSocket和被select處理過的fdRead進行比較，決定由哪些socket有數據可以讀取
			for(int i=0;i<fdSocket.fd_count;i++)
			{
				if(FD_ISSET(fdSocket.fd_array[i],&fdRead))
				{
					if(fdSocket.fd_array[i] == sListen)
					{
						if(fdSocket.fd_count < FD_SETSIZE)
						{
							sockaddr_in addrRemote;
							int nAddrLen = sizeof(addrRemote);
							SOCKET sClient = accept(sListen,(sockaddr*)&addrRemote,&nAddrLen);
							FD_SET(sClient,&fdSocket);
							printf("接收到連接：(%s)\n",inet_ntoa(addrRemote.sin_addr));
						}
						else
						{
							printf("連接數量已達上限！\n");
							continue;
						}
					}
					else
					{
						int nRecv = recv(fdSocket.fd_array[i],buf,4096,0);
						if(nRecv > 0)
						{
							buf[nRecv] = 0;
							
							printf("收到數據：%s\n",buf);
						
							int nRet = send(fdSocket.fd_array[i],buf,nRecv,0);
							if(nRet <= 0)
							{
								SOCKET s = fdSocket.fd_array[i];
								if(GetLastError() == WSAEWOULDBLOCK)
								{									
									if(g_map.find(s) == g_map.end())
									{
										char* szTmp = new char[nRecv + 1];
										strncpy(szTmp,buf,nRecv);
										szTmp[nRecv] = 0;
										g_map[s] = szTmp;
									}
									else
									{
										char* szOld = g_map[s];
										char* szTmp2 = new char[strlen(szOld) + nRecv + 1];
										strncpy(szTmp2,szOld,strlen(szOld));
										strncpy(szTmp2 + strlen(szOld),buf,nRecv);
										szTmp2[strlen(szOld) + nRecv] = 0;
										delete [] szOld;
										g_map[s] = szTmp2;
									}
									FD_SET(fdSocket.fd_array[i],&fdWrite);
								}
								else
								{
									closesocket(fdSocket.fd_array[i]);
									if(g_map.find(s) != g_map.end())
									{
										if(g_map[s] != NULL)
											delete [] g_map[s];
										g_map.erase(s);
									}
									FD_CLR(fdSocket.fd_array[i],&fdSocket);
								}
							}
							printf("發送了%d\n",nRet);
						}
						else
						{
							printf("1個Client已斷開\n");
							closesocket(fdSocket.fd_array[i]);
							FD_CLR(fdSocket.fd_array[i],&fdSocket);
						}
					}
				}
				if(FD_ISSET(fdSocket.fd_array[i],&fdTmp))
				{
					SOCKET s = fdSocket.fd_array[i];
					if(g_map.find(s) != g_map.end())
					{
						char* szToSend = g_map[s];
						int nToSend = strlen(szToSend);
						int nRet = send(fdSocket.fd_array[i],szToSend,nToSend,0);
						if(nRet <= 0)
						{
							if(GetLastError() == WSAEWOULDBLOCK)
							{									
								//do nothing
							}
							else
							{
								closesocket(fdSocket.fd_array[i]);
								if(g_map.find(s) != g_map.end())
								{
									if(g_map[s] != NULL)
										delete [] g_map[s];
									g_map.erase(s);
								}
								FD_CLR(fdSocket.fd_array[i],&fdSocket);
							}
						}
						else if(nRet < nToSend)
						{
							printf("發送了%d/%d\n",nRet,nToSend);
							nToSend -= nRet;
							char* szTmp = new char[nToSend + 1];
							strncpy(szTmp,szToSend + nRet,nToSend);
							szTmp[nToSend] = 0;
							delete [] szToSend;
							g_map[s] = szTmp;					
						}
						else
						{
							if(g_map[s] != NULL)
								delete [] g_map[s];
							g_map.erase(s);
							FD_CLR(fdSocket.fd_array[i],&fdWrite);
						}
						printf("============================================發送了%d\n",nRet);
					}
				}
			}
		}
		else if(nRetAll == 0)
		{
			printf("time out!\n");
		}
		else
		{
			printf("select error!%d\n",WSAGetLastError());
			Sleep(5000);
			break;
		}
	}
	closesocket(sListen);
	WSACleanup();
}

四，異步選擇模型

注意：收到FD_Write消息有2種情況：1，在socket第一次和窗口句柄綁定後。2，socket從不可寫狀態變成可寫狀態。下面的事件選擇模型也是同理。

[cpp] view plain copy print ?

#include <WinSock2.h>
#include <Windows.h>
#include <stdio.h>
#include <map>
using namespace std;
#pragma comment(lib,"Ws2_32.lib")
#define WM_SOCKET (WM_USER + 100)
map<SOCKET,char*> g_map;
LRESULT WINAPI WindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
switch(uMsg)
{
case WM_SOCKET:
{
SOCKET s = wParam;
if(WSAGETSELECTERROR(lParam))
{
printf("消息錯誤！\n");
closesocket(s);
return 0;
}
switch(WSAGETSELECTEVENT(lParam))
{
case FD_ACCEPT:
{
sockaddr_in addrRemote;
int nAddrLen = sizeof(addrRemote);
SOCKET sClient = accept(s,(sockaddr*)&addrRemote,&nAddrLen);
WSAAsyncSelect(sClient,hwnd,WM_SOCKET,FD_READ | FD_WRITE | FD_CLOSE);
}break;
case FD_WRITE:
{
printf("write====================\n");
if(!g_map.empty())
{
char* buf = g_map[s];
int nLenth = strlen(buf);
while(nLenth > 0)
{
int nRet = send(s,buf,nLenth,0);
if(nRet > 0)
{
buf += nRet;
nLenth -= nRet;
}
else if(10035 == GetLastError())
{
char* newBuf = new char[nLenth + 1];
strncpy(newBuf,buf,nLenth);
newBuf[nLenth] = 0;
delete [] g_map[s];
g_map[s] = newBuf;
break;
}
else
{
delete [] g_map[s];
g_map.erase(s);
closesocket(s);
}
}
if(nLenth == 0)
{
g_map.erase(s);
}
}
}break;
case FD_READ:
{
char buf[4096];
int nRet = recv(s,buf,4096,0);
if(nRet > 0)
{
buf[nRet] = 0;
//printf("收到數據：%s\n",buf);
int x = send(s,buf,nRet,0);
printf("已發送字節數：%d , 線程號：%d\n",x,GetCurrentThreadId());
if(x < 0)
{
int iError = GetLastError();
printf("數據:%s ,錯誤：%d\n",buf,iError);
if(10035 == iError)
{
if(g_map.end() != g_map.find(s))
{
int newLength = strlen(g_map[s]) + strlen(buf);
char* newBuf = new char[newLength + 1];
strncpy(newBuf,g_map[s],strlen(g_map[s]));
strncpy(newBuf+strlen(g_map[s]),buf,strlen(buf));
newBuf[newLength] = 0;
delete [] g_map[s];
g_map[s] = newBuf;
}
else
{
char* newBuf = new char[strlen(buf) + 1];
strncpy(newBuf,buf,strlen(buf));
newBuf[strlen(buf)] = 0;
g_map[s] = newBuf;
}
}
else
{
if(g_map.end() != g_map.find(s))
{
delete [] g_map[s];
g_map.erase(s);
}
closesocket(s);
}
}
}
else
{
printf("1個Client已經斷開1111！\n");
if(g_map.end() != g_map.find(s))
{
delete [] g_map[s];
g_map.erase(s);
}
closesocket(s);
}
}break;
case FD_CLOSE:
{
printf("1個Client已經斷開222！\n");
if(g_map.end() != g_map.find(s))
{
delete [] g_map[s];
g_map.erase(s);
}
closesocket(s);
}break;
}
}break;
case WM_DESTROY:
{
printf("窗口已關閉！\n");
PostQuitMessage(0);
}
}
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
int main()
{
char szClassName[] = "WSAAsyncSelect Test";
static WNDCLASSEX wndClass;
wndClass.cbSize = sizeof(wndClass);
wndClass.style = CS_HREDRAW | CS_VREDRAW;
wndClass.lpfnWndProc = WindowProc;
wndClass.cbClsExtra = 0;
wndClass.cbWndExtra = 0;
wndClass.hInstance = GetModuleHandle(0);
wndClass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wndClass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndClass.lpszMenuName = NULL;
wndClass.lpszClassName = szClassName;
wndClass.hIconSm = NULL;
ATOM atom = RegisterClassEx(&wndClass);
if(0 == atom)
{
char error[256];
sprintf(error,"RegisterClassEx錯誤！%d",GetLastError());
MessageBox(NULL,error,"error",MB_OK);
return -1;
}
HWND hwnd = CreateWindowEx(0,(char *)atom,"",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,
CW_USEDEFAULT,CW_USEDEFAULT,HWND_MESSAGE,NULL,NULL,NULL);
if(hwnd == NULL)
{
char error[256];
sprintf(error,"創建窗口錯誤！%d",GetLastError());
MessageBox(NULL,error,"error",MB_OK);
return -1;
}
WSAData wsaData;
if(0 != WSAStartup(MAKEWORD(2,2),&wsaData))
{
printf("初始化失敗!%d\n",WSAGetLastError());
Sleep(5000);
return -1;
}
USHORT nport = 3456;
SOCKET sListen = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(nport);
sin.sin_addr.S_un.S_addr = ADDR_ANY;
if(SOCKET_ERROR == bind(sListen,(sockaddr*)&sin,sizeof(sin)))
{
printf("bind failed!%d\n",WSAGetLastError());
Sleep(5000);
return -1;
}
WSAAsyncSelect(sListen,hwnd,WM_SOCKET,FD_ACCEPT | FD_CLOSE);
listen(sListen,5);
MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
closesocket(sListen);
WSACleanup();
return msg.wParam;
}

#include <WinSock2.h>
#include <Windows.h>
#include <stdio.h>
#include <map>
using namespace std;


#pragma comment(lib,"Ws2_32.lib")


#define WM_SOCKET (WM_USER + 100) 


map<SOCKET,char*> g_map;
LRESULT WINAPI WindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
	switch(uMsg)
	{
	case WM_SOCKET:
		{
			SOCKET s = wParam;
			if(WSAGETSELECTERROR(lParam))
			{
				printf("消息錯誤！\n");
				closesocket(s);
				return 0;
			}


			switch(WSAGETSELECTEVENT(lParam))
			{
			case FD_ACCEPT:
				{
					sockaddr_in addrRemote;
					int nAddrLen = sizeof(addrRemote);
					SOCKET sClient = accept(s,(sockaddr*)&addrRemote,&nAddrLen);
					WSAAsyncSelect(sClient,hwnd,WM_SOCKET,FD_READ | FD_WRITE | FD_CLOSE);
				}break;
			case FD_WRITE:
				{
					printf("write====================\n");
					if(!g_map.empty())
					{
						char* buf = g_map[s];
						int nLenth = strlen(buf);
						while(nLenth > 0)
						{
							int nRet = send(s,buf,nLenth,0);
							if(nRet > 0)
							{
								buf += nRet;
								nLenth -= nRet;
							}
							else if(10035 == GetLastError())
							{
								char* newBuf = new char[nLenth + 1];
								strncpy(newBuf,buf,nLenth);
								newBuf[nLenth] = 0;
								delete [] g_map[s];
								g_map[s] = newBuf;
								break;
							}
							else
							{
								delete [] g_map[s];
								g_map.erase(s);
								closesocket(s);
							}
						}
						if(nLenth == 0)
						{
							g_map.erase(s);
						}
					}
				}break;
			case FD_READ:
				{
					char buf[4096];
					int nRet = recv(s,buf,4096,0);
					if(nRet > 0)
					{
						buf[nRet] = 0;
						//printf("收到數據：%s\n",buf);
						int x = send(s,buf,nRet,0);
						printf("已發送字節數：%d , 線程號：%d\n",x,GetCurrentThreadId());
						if(x < 0)
						{
							int iError = GetLastError();
							printf("數據:%s ,錯誤：%d\n",buf,iError);
							if(10035 == iError)
							{
								if(g_map.end() != g_map.find(s))
								{
									int newLength = strlen(g_map[s]) + strlen(buf);
									char* newBuf = new char[newLength + 1];
									strncpy(newBuf,g_map[s],strlen(g_map[s]));
									strncpy(newBuf+strlen(g_map[s]),buf,strlen(buf));
									newBuf[newLength] = 0;
									delete [] g_map[s];
									g_map[s] = newBuf;
								}
								else
								{
									char* newBuf = new char[strlen(buf) + 1];
									strncpy(newBuf,buf,strlen(buf));
									newBuf[strlen(buf)] = 0;
									g_map[s] = newBuf;
								}
							}
							else
							{
								if(g_map.end() != g_map.find(s))
								{
									delete [] g_map[s];
									g_map.erase(s);
								}
								closesocket(s);
							}
						}	
					}
					else
					{
						printf("1個Client已經斷開1111！\n");
						if(g_map.end() != g_map.find(s))
						{
							delete [] g_map[s];
							g_map.erase(s);
						}
						closesocket(s);
					}
				}break;
			case FD_CLOSE:
				{
					printf("1個Client已經斷開222！\n");
					if(g_map.end() != g_map.find(s))
					{
						delete [] g_map[s];
						g_map.erase(s);
					}
					closesocket(s);
				}break;	
			}
		}break;
	case WM_DESTROY:
		{
			printf("窗口已關閉！\n");
			PostQuitMessage(0);
		}
	}
	return DefWindowProc(hwnd,uMsg,wParam,lParam);
}


int main()
{
	char szClassName[] = "WSAAsyncSelect Test";
	static WNDCLASSEX wndClass;
	wndClass.cbSize = sizeof(wndClass);
	wndClass.style = CS_HREDRAW | CS_VREDRAW;
	wndClass.lpfnWndProc = WindowProc;
	wndClass.cbClsExtra = 0;
	wndClass.cbWndExtra = 0;
	wndClass.hInstance = GetModuleHandle(0);
	wndClass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
	wndClass.hCursor = LoadCursor(NULL,IDC_ARROW);
	wndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wndClass.lpszMenuName = NULL;
	wndClass.lpszClassName = szClassName;
	wndClass.hIconSm = NULL;


	ATOM atom = RegisterClassEx(&wndClass);
	if(0 == atom)
	{
		char error[256];
		sprintf(error,"RegisterClassEx錯誤！%d",GetLastError());
		MessageBox(NULL,error,"error",MB_OK);
		return -1;
	}
	HWND hwnd = CreateWindowEx(0,(char *)atom,"",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,
		CW_USEDEFAULT,CW_USEDEFAULT,HWND_MESSAGE,NULL,NULL,NULL);
	if(hwnd == NULL)
	{
		char error[256];
		sprintf(error,"創建窗口錯誤！%d",GetLastError());
		MessageBox(NULL,error,"error",MB_OK);
		return -1;
	}


	WSAData wsaData;
	if(0 != WSAStartup(MAKEWORD(2,2),&wsaData))
	{
		printf("初始化失敗!%d\n",WSAGetLastError());
		Sleep(5000);
		return -1;
	}
	USHORT nport = 3456;
	SOCKET sListen = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(nport);
	sin.sin_addr.S_un.S_addr = ADDR_ANY;


	if(SOCKET_ERROR == bind(sListen,(sockaddr*)&sin,sizeof(sin)))
	{
		printf("bind failed!%d\n",WSAGetLastError());
		Sleep(5000);
		return -1;
	}


	WSAAsyncSelect(sListen,hwnd,WM_SOCKET,FD_ACCEPT | FD_CLOSE);
	listen(sListen,5);


	MSG msg;
	while(GetMessage(&msg,NULL,0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	closesocket(sListen);
	WSACleanup();
	return msg.wParam;
}

五，事件選擇模型

事件選擇模型主要難點是對線程池的使用，send操作可以參考異步選擇模型。

[cpp] view plain copy print ?

#include <WinSock2.h>
#include <Windows.h>
#include <stdio.h>
#include <vector>
using namespace std;
#pragma comment(lib,"Ws2_32.lib")
typedef struct _THREAD_OBJ
{
HANDLE events[WSA_MAXIMUM_WAIT_EVENTS];
SOCKET sockets[WSA_MAXIMUM_WAIT_EVENTS];
int nSocksUsed;
CRITICAL_SECTION cs;
_THREAD_OBJ *pNext;
}THREAD_OBJ,*PTHREAD_OBJ;
PTHREAD_OBJ g_pThreadList = NULL;
CRITICAL_SECTION g_cs;
BOOL g_bServerRunning = FALSE;
HANDLE g_hThreads[1000] = {0};
int g_nThreadsCount = 0;
PTHREAD_OBJ CreateThreadObj()
{
PTHREAD_OBJ pThread = new THREAD_OBJ();
if(pThread != NULL)
{
InitializeCriticalSectionAndSpinCount(&pThread->cs,4000);
pThread->events[0] = WSACreateEvent();
pThread->nSocksUsed = 1;
EnterCriticalSection(&g_cs);
pThread->pNext = g_pThreadList;
g_pThreadList = pThread;
LeaveCriticalSection(&g_cs);
}
return pThread;
}
void FreeThreadObj(PTHREAD_OBJ pThread)
{
if(pThread == NULL)
return;
EnterCriticalSection(&g_cs);
PTHREAD_OBJ p = g_pThreadList;
if(p == pThread)
{
g_pThreadList = p->pNext;
}
else
{
while(p != NULL && p->pNext != pThread)
{
p = p->pNext;
}
if(p != NULL)
{
p->pNext = pThread->pNext;
}
}
LeaveCriticalSection(&g_cs);
DeleteCriticalSection(&pThread->cs);
WSACloseEvent(pThread->events[0]);
delete pThread;
}
LONG g_nTotalConnections;
LONG g_nCurrentConnections;
BOOL InsertSocket(PTHREAD_OBJ pThread,SOCKET s)
{
if(pThread == NULL || s == INVALID_SOCKET)
return FALSE;
BOOL bRet = FALSE;
EnterCriticalSection(&pThread->cs);
if(pThread->nSocksUsed < WSA_MAXIMUM_WAIT_EVENTS)
{
pThread->events[pThread->nSocksUsed] = WSACreateEvent();
pThread->sockets[pThread->nSocksUsed] = s;
WSAEventSelect(s,pThread->events[pThread->nSocksUsed],FD_READ | FD_CLOSE | FD_WRITE);
pThread->nSocksUsed++;
bRet = TRUE;
WSASetEvent(pThread->events[0]);//通知線程，有新的事件加入了，需要重新調用WSAWaitFormultipleEvents
}
LeaveCriticalSection(&pThread->cs);
if(bRet)
{
InterlockedIncrement(&g_nTotalConnections);
InterlockedIncrement(&g_nCurrentConnections);
}
return bRet;
}
void RemoveSocket(PTHREAD_OBJ pThread,SOCKET s)
{
if(pThread == NULL || s == INVALID_SOCKET)
return;
EnterCriticalSection(&pThread->cs);
for(int i=1;i<pThread->nSocksUsed;i++)
{
if(pThread->sockets[i] == s)
{
WSACloseEvent(pThread->events[i]);
closesocket(s);
for(int j=i;j<pThread->nSocksUsed - 1;j++)
{
pThread->events[j] = pThread->events[j+1];
pThread->sockets[j] = pThread->sockets[j+1];
}
pThread->nSocksUsed--;
break;
}
}
LeaveCriticalSection(&pThread->cs);
InterlockedDecrement(&g_nCurrentConnections);
}
BOOL HandleIo(PTHREAD_OBJ pThread,int nIndex)
{
WSANETWORKEVENTS event;
SOCKET s = pThread->sockets[nIndex];
HANDLE sEvent = pThread->events[nIndex];
if(0 != WSAEnumNetworkEvents(s,sEvent,&event))
{
printf("socket error!\n");
RemoveSocket(pThread,s);
return FALSE;
}
do
{
if(event.lNetworkEvents & FD_READ)
{
if(event.iErrorCode[FD_READ_BIT] == 0)
{
char szText[256];
int nRecv = recv(s,szText,strlen(szText),0);
if(nRecv > 0)
{
szText[nRecv] = '\0';
printf("接收到數據:%s\n",szText);
}
else
{
break;
}
}
else
break;
}
else if(event.lNetworkEvents & FD_CLOSE)
{
break;
}
else if(event.lNetworkEvents & FD_WRITE)
{
printf("FD_WRITE==========================\n");
}
return TRUE;
} while (FALSE);
printf("socket error2!\n");
RemoveSocket(pThread,s);
return FALSE;
}
DWORD WINAPI ServerThread(LPVOID lpParam)
{
PTHREAD_OBJ pThread = (PTHREAD_OBJ)lpParam;
while(TRUE)
{
int nIndex = WSAWaitForMultipleEvents(
pThread->nSocksUsed,pThread->events,FALSE,WSA_INFINITE,FALSE);
nIndex = nIndex - WSA_WAIT_EVENT_0;
if(nIndex == WSA_WAIT_FAILED || nIndex == WSA_WAIT_TIMEOUT)
{
printf("WSAWaitForMultipleEvents error!\n");
continue;
}
else if(nIndex == 0)
{
ResetEvent(pThread->events[0]);
}
else
{
HandleIo(pThread,nIndex);
}
if(!g_bServerRunning && pThread->nSocksUsed == 1)
break;
}
FreeThreadObj(pThread);
return 0;
}
BOOL AssignToFreeThread(SOCKET s)
{
if(s == INVALID_SOCKET)
return FALSE;
BOOL bAllSucceed = TRUE;
EnterCriticalSection(&g_cs);
PTHREAD_OBJ pThread = g_pThreadList;
while(pThread != NULL)
{
if(InsertSocket(pThread,s))
{
break;
}
pThread = pThread->pNext;
}
if(pThread == NULL)
{
if(g_nThreadsCount < 1000)
{
pThread = CreateThreadObj();
HANDLE hThread = CreateThread(NULL,0,ServerThread,pThread,0,NULL);
if(!hThread)
{
bAllSucceed = FALSE;
FreeThreadObj(pThread);
}
else
{
g_hThreads[g_nThreadsCount++] = hThread;
InsertSocket(pThread,s);
}
}
else
bAllSucceed = FALSE;
}
LeaveCriticalSection(&g_cs);
return bAllSucceed;
}
DWORD WINAPI ControlThread(LPVOID lpParma)
{
HANDLE wsaEvent = (HANDLE)lpParma;
char cmd[128];
while(scanf("%s",cmd))
{
if(cmd[0] == 's')
{
g_bServerRunning = FALSE;
EnterCriticalSection(&g_cs);
PTHREAD_OBJ pThread = g_pThreadList;
while(pThread != NULL)
{
EnterCriticalSection(&pThread->cs);
for(int i=0;i<pThread->nSocksUsed;i++)
{
closesocket(pThread->sockets[i]);
}
WSASetEvent(pThread->events[0]);
LeaveCriticalSection(&pThread->cs);
pThread = pThread->pNext;
}
LeaveCriticalSection(&g_cs);
WSASetEvent(wsaEvent);
break;
}
}
return 0;
}
int main()
{
WSAData wsaData;
if(0 != WSAStartup(MAKEWORD(2,2),&wsaData))
{
printf("初始化失敗!%d\n",WSAGetLastError());
Sleep(5000);
return -1;
}
USHORT nport = 3456;
SOCKET sListen = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(nport);
sin.sin_addr.S_un.S_addr = ADDR_ANY;
if(SOCKET_ERROR == bind(sListen,(sockaddr*)&sin,sizeof(sin)))
{
printf("bind failed!%d\n",WSAGetLastError());
Sleep(5000);
return -1;
}
listen(sListen,200);
WSAEVENT wsaEvent = WSACreateEvent();
WSAEventSelect(sListen,wsaEvent,FD_ACCEPT | FD_CLOSE);
InitializeCriticalSectionAndSpinCount(&g_cs,4000);
g_bServerRunning = TRUE;
HANDLE hThread = CreateThread(NULL,0,ControlThread,wsaEvent,0,NULL);
CloseHandle(hThread);
while(TRUE)
{
int nRet = WaitForSingleObject(wsaEvent,5*1000);
if(!g_bServerRunning)
{
closesocket(sListen);
WSACloseEvent(wsaEvent);
WSAWaitForMultipleEvents(g_nThreadsCount,g_hThreads,TRUE,INFINITE,FALSE);
for(int i=0;i<g_nThreadsCount;i++)
{
CloseHandle(g_hThreads[i]);
}
break;
}
if(nRet == WAIT_FAILED)
{
printf("WaitForSingleObject Failed!\n");
break;
}
else if(nRet == WAIT_TIMEOUT)
{
printf("\nTotalConnections: %d\nCurrentConnections: %d\nThreads:%d\n",
g_nTotalConnections,g_nCurrentConnections,g_nThreadsCount);
continue;
}
else
{
ResetEvent(wsaEvent);
while(TRUE)
{
sockaddr_in addrRemote;
int nLen = sizeof(addrRemote);
SOCKET sNew = accept(sListen,(sockaddr*)&addrRemote,&nLen);
if(sNew == SOCKET_ERROR)
break;
if(!AssignToFreeThread(sNew))
{
closesocket(sNew);
printf("AssignToFreeThread Failed！\n");
}
}
}
}
DeleteCriticalSection(&g_cs);
return 0;
}

#include <WinSock2.h>
#include <Windows.h>
#include <stdio.h>
#include <vector>
using namespace std;


#pragma comment(lib,"Ws2_32.lib")


typedef struct _THREAD_OBJ
{
	HANDLE events[WSA_MAXIMUM_WAIT_EVENTS];
	SOCKET sockets[WSA_MAXIMUM_WAIT_EVENTS];
	int nSocksUsed;
	CRITICAL_SECTION cs;
	_THREAD_OBJ *pNext;
}THREAD_OBJ,*PTHREAD_OBJ;


PTHREAD_OBJ g_pThreadList = NULL;
CRITICAL_SECTION g_cs;
BOOL g_bServerRunning = FALSE;
HANDLE g_hThreads[1000] = {0};
int g_nThreadsCount = 0;


PTHREAD_OBJ CreateThreadObj()
{ 
	PTHREAD_OBJ pThread = new THREAD_OBJ();
	if(pThread != NULL)
	{
		InitializeCriticalSectionAndSpinCount(&pThread->cs,4000);
		pThread->events[0] = WSACreateEvent();
		pThread->nSocksUsed = 1;
		EnterCriticalSection(&g_cs);
		pThread->pNext = g_pThreadList;
		g_pThreadList = pThread;
		LeaveCriticalSection(&g_cs);
	}
	return pThread;
}


void FreeThreadObj(PTHREAD_OBJ pThread)
{
	if(pThread == NULL)
		return;
	EnterCriticalSection(&g_cs);
	PTHREAD_OBJ p = g_pThreadList;
	if(p == pThread)
	{
		g_pThreadList = p->pNext;
	}
	else
	{
		while(p != NULL && p->pNext != pThread)
		{
			p = p->pNext;
		}
		if(p != NULL)
		{
			p->pNext = pThread->pNext;
		}
	}
	LeaveCriticalSection(&g_cs);


	DeleteCriticalSection(&pThread->cs);
	WSACloseEvent(pThread->events[0]);
	delete pThread;
}


LONG g_nTotalConnections;
LONG g_nCurrentConnections;


BOOL InsertSocket(PTHREAD_OBJ pThread,SOCKET s)
{
	if(pThread == NULL || s == INVALID_SOCKET)
		return FALSE;


	BOOL bRet = FALSE;
	EnterCriticalSection(&pThread->cs);
	if(pThread->nSocksUsed < WSA_MAXIMUM_WAIT_EVENTS)
	{
		pThread->events[pThread->nSocksUsed] = WSACreateEvent();
		pThread->sockets[pThread->nSocksUsed] = s;
		WSAEventSelect(s,pThread->events[pThread->nSocksUsed],FD_READ | FD_CLOSE | FD_WRITE);
		pThread->nSocksUsed++;
		bRet = TRUE;
		WSASetEvent(pThread->events[0]);//通知線程，有新的事件加入了，需要重新調用WSAWaitFormultipleEvents
	}
	LeaveCriticalSection(&pThread->cs);


	if(bRet)
	{
		InterlockedIncrement(&g_nTotalConnections);
		InterlockedIncrement(&g_nCurrentConnections);
	}
	return bRet;
}


void RemoveSocket(PTHREAD_OBJ pThread,SOCKET s)
{
	if(pThread == NULL || s == INVALID_SOCKET)
		return;
	EnterCriticalSection(&pThread->cs);
	for(int i=1;i<pThread->nSocksUsed;i++)
	{
		if(pThread->sockets[i] == s)
		{
			WSACloseEvent(pThread->events[i]);
			closesocket(s);
			for(int j=i;j<pThread->nSocksUsed - 1;j++)
			{
				pThread->events[j] = pThread->events[j+1];
				pThread->sockets[j] = pThread->sockets[j+1];
			}
			pThread->nSocksUsed--;
			break;
		}
	}
	LeaveCriticalSection(&pThread->cs);
	InterlockedDecrement(&g_nCurrentConnections);
}


BOOL HandleIo(PTHREAD_OBJ pThread,int nIndex)
{
	WSANETWORKEVENTS event;
	SOCKET s = pThread->sockets[nIndex];
	HANDLE sEvent = pThread->events[nIndex];
	if(0 != WSAEnumNetworkEvents(s,sEvent,&event))
	{
		printf("socket error!\n");
		RemoveSocket(pThread,s);
		return FALSE;
	}
	do 
	{
		if(event.lNetworkEvents & FD_READ)
		{
			if(event.iErrorCode[FD_READ_BIT] == 0)
			{
				char szText[256];
				int nRecv = recv(s,szText,strlen(szText),0);
				if(nRecv > 0)
				{
					szText[nRecv] = '\0';
					printf("接收到數據:%s\n",szText);		
				}
				else
				{
					break;
				}
			}
			else
				break;
		}
		else if(event.lNetworkEvents & FD_CLOSE)
		{
			break;
		}
		else if(event.lNetworkEvents & FD_WRITE)
		{
			printf("FD_WRITE==========================\n");
		}
		return TRUE;
	} while (FALSE);
	printf("socket error2!\n");
	RemoveSocket(pThread,s);
	return FALSE;
}


DWORD WINAPI ServerThread(LPVOID lpParam)
{
	PTHREAD_OBJ pThread = (PTHREAD_OBJ)lpParam;


	while(TRUE)
	{
		int nIndex = WSAWaitForMultipleEvents(
			pThread->nSocksUsed,pThread->events,FALSE,WSA_INFINITE,FALSE);
		nIndex = nIndex - WSA_WAIT_EVENT_0;


		if(nIndex == WSA_WAIT_FAILED || nIndex == WSA_WAIT_TIMEOUT)
		{
			printf("WSAWaitForMultipleEvents error!\n");
			continue;
		}
		else if(nIndex == 0)
		{
			ResetEvent(pThread->events[0]);
		}
		else
		{
			HandleIo(pThread,nIndex);
		}
		if(!g_bServerRunning && pThread->nSocksUsed == 1)
			break;
	}
	FreeThreadObj(pThread);
	return 0;
}


BOOL AssignToFreeThread(SOCKET s)
{
	if(s == INVALID_SOCKET)
		return FALSE;
	BOOL bAllSucceed = TRUE;
	EnterCriticalSection(&g_cs);
	PTHREAD_OBJ pThread = g_pThreadList;
	while(pThread != NULL)
	{
		if(InsertSocket(pThread,s))
		{
			break;
		}
		pThread = pThread->pNext;
	}
	if(pThread == NULL)
	{
		if(g_nThreadsCount < 1000)
		{
			pThread = CreateThreadObj();
			HANDLE hThread = CreateThread(NULL,0,ServerThread,pThread,0,NULL);
			if(!hThread)
			{
				bAllSucceed = FALSE;
				FreeThreadObj(pThread);
			}
			else
			{
			    g_hThreads[g_nThreadsCount++] = hThread;
				InsertSocket(pThread,s);
			}
		}
		else
			bAllSucceed = FALSE;
	}
	LeaveCriticalSection(&g_cs);
	return bAllSucceed;
}


DWORD WINAPI ControlThread(LPVOID lpParma)
{
	HANDLE wsaEvent = (HANDLE)lpParma;
	char cmd[128];
	while(scanf("%s",cmd))
	{
		if(cmd[0] == 's')
		{
			g_bServerRunning = FALSE;
			EnterCriticalSection(&g_cs);
			PTHREAD_OBJ pThread = g_pThreadList;
			while(pThread != NULL)
			{
				EnterCriticalSection(&pThread->cs);
				for(int i=0;i<pThread->nSocksUsed;i++)
				{
					closesocket(pThread->sockets[i]);
				}
				WSASetEvent(pThread->events[0]);
				LeaveCriticalSection(&pThread->cs);
				pThread = pThread->pNext;
			}
			LeaveCriticalSection(&g_cs);
			WSASetEvent(wsaEvent);
			break;
		}
	}
	return 0;
}


int main()
{
	WSAData wsaData;
	if(0 != WSAStartup(MAKEWORD(2,2),&wsaData))
	{
		printf("初始化失敗!%d\n",WSAGetLastError());
		Sleep(5000);
		return -1;
	}
	USHORT nport = 3456;
	SOCKET sListen = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(nport);
	sin.sin_addr.S_un.S_addr = ADDR_ANY;


	if(SOCKET_ERROR == bind(sListen,(sockaddr*)&sin,sizeof(sin)))
	{
		printf("bind failed!%d\n",WSAGetLastError());
		Sleep(5000);
		return -1;
	}


	listen(sListen,200);


	WSAEVENT wsaEvent = WSACreateEvent();
	WSAEventSelect(sListen,wsaEvent,FD_ACCEPT | FD_CLOSE);
	InitializeCriticalSectionAndSpinCount(&g_cs,4000);
	g_bServerRunning = TRUE;
	HANDLE hThread = CreateThread(NULL,0,ControlThread,wsaEvent,0,NULL);
	CloseHandle(hThread);
	while(TRUE)
	{
		int nRet = WaitForSingleObject(wsaEvent,5*1000);
		if(!g_bServerRunning)
		{
	        closesocket(sListen);
			WSACloseEvent(wsaEvent);
			WSAWaitForMultipleEvents(g_nThreadsCount,g_hThreads,TRUE,INFINITE,FALSE);
			for(int i=0;i<g_nThreadsCount;i++)
			{
				CloseHandle(g_hThreads[i]);
			}
			break;
		}
		if(nRet == WAIT_FAILED)
		{
			printf("WaitForSingleObject Failed!\n");
			break;
		}
		else if(nRet == WAIT_TIMEOUT)
		{
			printf("\nTotalConnections: %d\nCurrentConnections: %d\nThreads:%d\n",
				g_nTotalConnections,g_nCurrentConnections,g_nThreadsCount);
			continue;
		}
		else
		{
			ResetEvent(wsaEvent);
			while(TRUE)
			{
				sockaddr_in addrRemote;
				int nLen = sizeof(addrRemote);
				SOCKET sNew = accept(sListen,(sockaddr*)&addrRemote,&nLen);
				if(sNew == SOCKET_ERROR)
					break;
				
				if(!AssignToFreeThread(sNew))
				{
					closesocket(sNew);
					printf("AssignToFreeThread Failed！\n");
				}
			}
		}
	}
	DeleteCriticalSection(&g_cs);
	return 0;
}

六，重疊I/O模型。

若需要建線程池，可參考事件選擇模型。若糾結於send，可參考下面的IOCP。

[cpp] view plain copy print ?

#include <WinSock2.h>
#include <Windows.h>
#include <MSWSock.h>
#include <stdio.h>
#pragma comment(lib,"Ws2_32.lib")
#define BUFFER_SIZE 4096
typedef struct _SOCKET_OBJ
{
SOCKET s;
int nOutstandingOps;
LPFN_ACCEPTEX lpfnAcceptEx;
}SOCKET_OBJ,*PSOCKET_OBJ;
PSOCKET_OBJ CreateSocketObj(SOCKET s)
{
PSOCKET_OBJ pSocket = new SOCKET_OBJ();
if(pSocket != NULL)
pSocket->s = s;
return pSocket;
}
void FreeSocketObj(PSOCKET_OBJ pSocket)
{
if(pSocket == NULL)
return;
if(pSocket->s != INVALID_SOCKET)
closesocket(pSocket->s);
delete pSocket;
}
typedef struct _BUFFER_OBJ
{
OVERLAPPED ol;
char* buff;
int nLen;
PSOCKET_OBJ pSocket;
int nOperation;
#define OP_ACCEPT 1
#define OP_READ 2
#define OP_WRITE 3
SOCKET sAccept;
_BUFFER_OBJ* pNext;
}BUFFER_OBJ,*PBUFFER_OBJ;
HANDLE g_events[WSA_MAXIMUM_WAIT_EVENTS];
int g_nBufferCount;
PBUFFER_OBJ g_pBufferHeader,g_pBufferTail;
BOOL g_bServerRunning;
CRITICAL_SECTION g_cs;
PBUFFER_OBJ CreateBufferObj(PSOCKET_OBJ pSocket,ULONG nLen)
{
if(g_nBufferCount > WSA_MAXIMUM_WAIT_EVENTS - 1)
return NULL;
PBUFFER_OBJ pBuffer = new BUFFER_OBJ();
if(pBuffer != NULL)
{
pBuffer->buff = new char[nLen];
pBuffer->nLen = nLen;
pBuffer->ol.hEvent = WSACreateEvent();
pBuffer->pSocket = pSocket;
pBuffer->sAccept = INVALID_SOCKET;
pBuffer->pNext = NULL;
EnterCriticalSection(&g_cs);
if(g_pBufferHeader == NULL)
{
g_pBufferHeader = g_pBufferTail = pBuffer;
}
else
{
g_pBufferTail->pNext = pBuffer;
g_pBufferTail = pBuffer;
}
LeaveCriticalSection(&g_cs);
g_events[++g_nBufferCount] = pBuffer->ol.hEvent;
}
return pBuffer;
}
void FreeBufferObj(PBUFFER_OBJ pBuffer)
{
EnterCriticalSection(&g_cs);
PBUFFER_OBJ pTest = g_pBufferHeader;
BOOL bFind = FALSE;
if(pTest == pBuffer)
{
if(g_pBufferHeader == g_pBufferTail)
g_pBufferHeader = g_pBufferTail = NULL;
else
g_pBufferHeader = g_pBufferHeader->pNext;
bFind = TRUE;
}
else
{
while(pTest != NULL && pTest->pNext != pBuffer)
pTest = pTest->pNext;
if(pTest != NULL)
{
pTest->pNext = pBuffer->pNext;
if(pTest->pNext == NULL)
g_pBufferTail = pTest;
bFind = TRUE;
}
}
if(bFind)
{
g_nBufferCount--;
WSACloseEvent(pBuffer->ol.hEvent);
delete [] pBuffer->buff;
delete pBuffer;
}
LeaveCriticalSection(&g_cs);
}
PBUFFER_OBJ FindBufferObj(HANDLE hEvent)
{
if(hEvent == NULL || hEvent == INVALID_HANDLE_VALUE)
return NULL;
EnterCriticalSection(&g_cs);
PBUFFER_OBJ pTest = g_pBufferHeader;
while(pTest != NULL && pTest->ol.hEvent != hEvent)
pTest = pTest->pNext;
LeaveCriticalSection(&g_cs);
return pTest;
}
void RebuildArray()
{
EnterCriticalSection(&g_cs);
PBUFFER_OBJ pBuffer = g_pBufferHeader;
int i=1;
while(pBuffer != NULL)
{
g_events[i++] = pBuffer->ol.hEvent;
pBuffer = pBuffer->pNext;
}
LeaveCriticalSection(&g_cs);
}
BOOL PostAccept(PBUFFER_OBJ pBuffer)
{
PSOCKET_OBJ pSocket = pBuffer->pSocket;
if(pSocket->lpfnAcceptEx != NULL)
{
pBuffer->nOperation = OP_ACCEPT;
pSocket->nOutstandingOps++;
DWORD dwBytes;
pBuffer->sAccept = WSASocket(AF_INET,SOCK_STREAM,0,NULL,0,WSA_FLAG_OVERLAPPED);
BOOL b = pSocket->lpfnAcceptEx(pSocket->s,
pBuffer->sAccept,pBuffer->buff,BUFFER_SIZE - ((sizeof(sockaddr_in) + 16)*2),
sizeof(sockaddr_in) + 16, sizeof(sockaddr_in) + 16,&dwBytes,&pBuffer->ol);
if(!b)
{
if(WSAGetLastError() != WSA_IO_PENDING)
return FALSE;
}
return TRUE;
}
return FALSE;
}
BOOL PostRecv(PBUFFER_OBJ pBuffer)
{
pBuffer->nOperation = OP_READ;
pBuffer->pSocket->nOutstandingOps++;
DWORD dwBytes;
DWORD dwFlags = 0;
WSABUF buf;
buf.buf = pBuffer->buff;
buf.len = pBuffer->nLen;
if(WSARecv(pBuffer->pSocket->s,&buf,1,&dwBytes,&dwFlags,&pBuffer->ol,NULL))
{
if(WSAGetLastError() != WSA_IO_PENDING)
return FALSE;
}
return TRUE;
}
BOOL PostSend(PBUFFER_OBJ pBuffer)
{
pBuffer->nOperation = OP_WRITE;
pBuffer->pSocket->nOutstandingOps++;
DWORD dwBytes;
DWORD dwFlags = 0;
WSABUF buf;
buf.buf = pBuffer->buff;
buf.len = pBuffer->nLen;
if(WSASend(pBuffer->pSocket->s,&buf,1,&dwBytes,dwFlags,&pBuffer->ol,NULL))
{
if(WSAGetLastError() != WSA_IO_PENDING)
return FALSE;
}
return TRUE;
}
BOOL HandleIo(PBUFFER_OBJ pBuffer)
{
if(pBuffer == NULL)
return FALSE;
PSOCKET_OBJ pSocket = pBuffer->pSocket;
pSocket->nOutstandingOps--;
DWORD dwTrans;
DWORD dwFlags;
BOOL bRet = WSAGetOverlappedResult(pSocket->s,&pBuffer->ol,&dwTrans,FALSE,&dwFlags);
if(!bRet)
{
if(pSocket->s != INVALID_SOCKET)
{
closesocket(pSocket->s);
pSocket->s = INVALID_SOCKET;
}
if(pBuffer->nOperation == OP_ACCEPT && pBuffer->sAccept != INVALID_SOCKET)
{
closesocket(pBuffer->sAccept);
pBuffer->sAccept = INVALID_SOCKET;
}
if(pSocket->nOutstandingOps == 0)
{
FreeSocketObj(pSocket);
}
FreeBufferObj(pBuffer);
return FALSE;
}
switch(pBuffer->nOperation)
{
case OP_ACCEPT:
{
if(dwTrans > 0)
{
pBuffer->buff[dwTrans] = 0;
printf("Accept收到數據：%s\n",pBuffer->buff);
PSOCKET_OBJ pClient = CreateSocketObj(pBuffer->sAccept);
PBUFFER_OBJ pRecv = CreateBufferObj(pClient,BUFFER_SIZE);
if(pRecv == NULL)
{
printf("Too much connections!\n");
FreeSocketObj(pClient);
return FALSE;
}
RebuildArray();
if(!PostRecv(pRecv))
{
FreeSocketObj(pClient);
FreeBufferObj(pBuffer);
return FALSE;
}
}
else
{
if(pSocket->s != INVALID_SOCKET)
{
closesocket(pSocket->s);
pSocket->s = INVALID_SOCKET;
}
if(pBuffer->sAccept != INVALID_SOCKET)
{
closesocket(pBuffer->sAccept);
pBuffer->sAccept = INVALID_SOCKET;
}
if(pSocket->nOutstandingOps == 0)
{
FreeSocketObj(pSocket);
}
FreeBufferObj(pBuffer);
}
// PBUFFER_OBJ pSend = CreateBufferObj(pClient,BUFFER_SIZE);
//if(pSend == NULL)
//{
// printf("Too much connections!\n");
// FreeSocketObj(pClient);
// return FALSE;
//}
//RebuildArray();
//pSend->nLen = dwTrans;
//memcpy(pSend->buff,pBuffer->buff,dwTrans);
//if(!PostSend(pSend))
//{
// FreeSocketObj(pSocket);
// FreeBufferObj(pBuffer);
// return FALSE;
//}
PostAccept(pBuffer);
}break;
case OP_READ:
{
if(dwTrans > 0)
{
pBuffer->buff[dwTrans] = 0;
printf("Recv收到數據：%s\n",pBuffer->buff);
PostRecv(pBuffer);
}
else
{
if(pSocket->s != INVALID_SOCKET)
{
closesocket(pSocket->s);
pSocket->s = INVALID_SOCKET;
}
if(pSocket->nOutstandingOps == 0)
{
FreeSocketObj(pSocket);
}
FreeBufferObj(pBuffer);
}
}break;
case OP_WRITE:
{
if(dwTrans > 0)
{
pBuffer->buff[dwTrans] = 0;
printf("發送數據: %s 成功！\n",pBuffer->buff);
FreeBufferObj(pBuffer);
}
else
{
if(pSocket->s != INVALID_SOCKET)
{
closesocket(pSocket->s);
pSocket->s = INVALID_SOCKET;
}
if(pSocket->nOutstandingOps == 0)
{
FreeSocketObj(pSocket);
}
FreeBufferObj(pBuffer);
}
}break;
}
}
DWORD WINAPI ControlThread(LPVOID lpParma)
{
char cmd[128];
while(scanf("%s",cmd))
{
if(cmd[0] == 's')
{
g_bServerRunning = FALSE;
EnterCriticalSection(&g_cs);
PBUFFER_OBJ pBuffer = g_pBufferHeader;
while(pBuffer != NULL)
{
if(pBuffer->pSocket != NULL && pBuffer->pSocket->s != INVALID_SOCKET)
closesocket(pBuffer->pSocket->s);
pBuffer = pBuffer->pNext;
}
LeaveCriticalSection(&g_cs);
break;
}
}
return 0;
}
int main()
{
InitializeCriticalSectionAndSpinCount(&g_cs,4000);
WSAData wsaData;
if(0 != WSAStartup(MAKEWORD(2,2),&wsaData))
{
printf("初始化失敗!%d\n",WSAGetLastError());
Sleep(5000);
return -1;
}
USHORT nport = 3456;
SOCKET sListen = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(nport);
sin.sin_addr.S_un.S_addr = ADDR_ANY;
if(SOCKET_ERROR == bind(sListen,(sockaddr*)&sin,sizeof(sin)))
{
printf("bind failed!%d\n",WSAGetLastError());
Sleep(5000);
return -1;
}
listen(sListen,200);
g_bServerRunning = TRUE;
PSOCKET_OBJ pListen = CreateSocketObj(sListen);
GUID GuidAcceptEx = WSAID_ACCEPTEX;
DWORD dwBytes;
WSAIoctl(pListen->s,
SIO_GET_EXTENSION_FUNCTION_POINTER,
&GuidAcceptEx,
sizeof(GuidAcceptEx),
&pListen->lpfnAcceptEx,
sizeof(pListen->lpfnAcceptEx),
&dwBytes,
NULL,
NULL);
g_events[0] = WSACreateEvent();
for(int i=0;i<5;++i)
{
PostAccept(CreateBufferObj(pListen,BUFFER_SIZE));
}
HANDLE hThread = CreateThread(NULL,0,ControlThread,NULL,0,NULL);
while(TRUE)
{
int nIndex = WSAWaitForMultipleEvents(g_nBufferCount+1,g_events,FALSE,WSA_INFINITE,FALSE);
if(nIndex == WSA_WAIT_FAILED)
{
printf("WSAWaitForMultipleEvents Failed!\n");
break;
}
nIndex = nIndex - WSA_WAIT_EVENT_0;
for(int i=nIndex;i<= g_nBufferCount;i++)
{
int nRet = WSAWaitForMultipleEvents(1,&g_events[i],FALSE,0,FALSE);
if(nRet == WSA_WAIT_TIMEOUT)
continue;
if(i == 0)
{
RebuildArray();
continue;
}
PBUFFER_OBJ pBuffer = FindBufferObj(g_events[i]);
if(pBuffer != NULL)
{
if(!HandleIo(pBuffer))
RebuildArray();
}
}
if(!g_bServerRunning && g_nBufferCount == 0)
break;
}
WSACloseEvent(g_events[0]);
WaitForSingleObject(hThread,INFINITE);
CloseHandle(hThread);
closesocket(sListen);
WSACleanup();
DeleteCriticalSection(&g_cs);
return 0;
}

#include <WinSock2.h>
#include <Windows.h>
#include <MSWSock.h>
#include <stdio.h>


#pragma comment(lib,"Ws2_32.lib")


#define BUFFER_SIZE 4096


typedef struct _SOCKET_OBJ
{
	SOCKET s;
	int nOutstandingOps;
	LPFN_ACCEPTEX lpfnAcceptEx;
}SOCKET_OBJ,*PSOCKET_OBJ;


PSOCKET_OBJ CreateSocketObj(SOCKET s)
{
	PSOCKET_OBJ pSocket = new SOCKET_OBJ();
	if(pSocket != NULL)
		pSocket->s = s;
	return pSocket;
}


void FreeSocketObj(PSOCKET_OBJ pSocket)
{
	if(pSocket == NULL)
		return;
	if(pSocket->s != INVALID_SOCKET)
		closesocket(pSocket->s);
	delete pSocket;
}


typedef struct _BUFFER_OBJ
{
	OVERLAPPED ol;
	char* buff;
	int nLen;
	PSOCKET_OBJ pSocket;
	int nOperation;
#define OP_ACCEPT 1
#define OP_READ 2
#define OP_WRITE 3
	SOCKET sAccept;
	_BUFFER_OBJ* pNext;
}BUFFER_OBJ,*PBUFFER_OBJ;






HANDLE g_events[WSA_MAXIMUM_WAIT_EVENTS];
int g_nBufferCount;
PBUFFER_OBJ g_pBufferHeader,g_pBufferTail;
BOOL g_bServerRunning;
CRITICAL_SECTION g_cs;


PBUFFER_OBJ CreateBufferObj(PSOCKET_OBJ pSocket,ULONG nLen)
{
	if(g_nBufferCount > WSA_MAXIMUM_WAIT_EVENTS - 1)
		return NULL;
	PBUFFER_OBJ pBuffer = new BUFFER_OBJ();
	if(pBuffer != NULL)
	{
		pBuffer->buff = new char[nLen];
		pBuffer->nLen = nLen;
		pBuffer->ol.hEvent = WSACreateEvent();
		pBuffer->pSocket = pSocket;
		pBuffer->sAccept = INVALID_SOCKET;
		pBuffer->pNext = NULL;
		EnterCriticalSection(&g_cs);
		if(g_pBufferHeader == NULL)
		{
			g_pBufferHeader = g_pBufferTail = pBuffer;
		}
		else
		{
			g_pBufferTail->pNext = pBuffer;
			g_pBufferTail = pBuffer;
		}
		LeaveCriticalSection(&g_cs);
		g_events[++g_nBufferCount] = pBuffer->ol.hEvent;
	}
	return pBuffer;
}


void FreeBufferObj(PBUFFER_OBJ pBuffer)
{
	EnterCriticalSection(&g_cs);
	PBUFFER_OBJ pTest = g_pBufferHeader;
	BOOL bFind = FALSE;
	if(pTest == pBuffer)
	{
		if(g_pBufferHeader == g_pBufferTail)
			g_pBufferHeader = g_pBufferTail = NULL;
		else
			g_pBufferHeader = g_pBufferHeader->pNext;
		bFind = TRUE;
	}
	else
	{
		while(pTest != NULL && pTest->pNext != pBuffer)
			pTest = pTest->pNext;
		if(pTest != NULL)
		{
			pTest->pNext = pBuffer->pNext;
			if(pTest->pNext == NULL)
				g_pBufferTail = pTest;
			bFind = TRUE;
		}
	}
	
	if(bFind)
	{
		g_nBufferCount--;
		WSACloseEvent(pBuffer->ol.hEvent);
		delete [] pBuffer->buff;
		delete pBuffer;
	}
	LeaveCriticalSection(&g_cs);
}


PBUFFER_OBJ FindBufferObj(HANDLE hEvent)
{
	if(hEvent == NULL || hEvent == INVALID_HANDLE_VALUE)
		return NULL;
	EnterCriticalSection(&g_cs);
	PBUFFER_OBJ pTest = g_pBufferHeader;
	while(pTest != NULL && pTest->ol.hEvent != hEvent)
		pTest = pTest->pNext;
	LeaveCriticalSection(&g_cs);
	return pTest;
}


void RebuildArray()
{
	EnterCriticalSection(&g_cs);
	PBUFFER_OBJ pBuffer = g_pBufferHeader;
	int i=1;
	while(pBuffer != NULL)
	{
		g_events[i++] = pBuffer->ol.hEvent;
		pBuffer = pBuffer->pNext;
	}
	LeaveCriticalSection(&g_cs);
}


BOOL PostAccept(PBUFFER_OBJ pBuffer)
{
	PSOCKET_OBJ pSocket = pBuffer->pSocket;
	if(pSocket->lpfnAcceptEx != NULL)
	{
		pBuffer->nOperation = OP_ACCEPT;
		pSocket->nOutstandingOps++;


		DWORD dwBytes;
		pBuffer->sAccept = WSASocket(AF_INET,SOCK_STREAM,0,NULL,0,WSA_FLAG_OVERLAPPED);
		BOOL b = pSocket->lpfnAcceptEx(pSocket->s,
			pBuffer->sAccept,pBuffer->buff,BUFFER_SIZE - ((sizeof(sockaddr_in) + 16)*2),
			sizeof(sockaddr_in) + 16, sizeof(sockaddr_in) + 16,&dwBytes,&pBuffer->ol);
		if(!b)
		{
			if(WSAGetLastError() != WSA_IO_PENDING)
				return FALSE;
		}
		return TRUE;
	}
	return FALSE;
}


BOOL PostRecv(PBUFFER_OBJ pBuffer)
{
	pBuffer->nOperation = OP_READ;
	pBuffer->pSocket->nOutstandingOps++;


	DWORD dwBytes;
	DWORD dwFlags = 0;
	WSABUF buf;
	buf.buf = pBuffer->buff;
	buf.len = pBuffer->nLen;
	if(WSARecv(pBuffer->pSocket->s,&buf,1,&dwBytes,&dwFlags,&pBuffer->ol,NULL))
	{
		if(WSAGetLastError() != WSA_IO_PENDING)
			return FALSE;
	}
	return TRUE;
}


BOOL PostSend(PBUFFER_OBJ pBuffer)
{
	pBuffer->nOperation = OP_WRITE;
	pBuffer->pSocket->nOutstandingOps++;
	DWORD dwBytes;
	DWORD dwFlags = 0;
	WSABUF buf;
	buf.buf = pBuffer->buff;
	buf.len = pBuffer->nLen;
	if(WSASend(pBuffer->pSocket->s,&buf,1,&dwBytes,dwFlags,&pBuffer->ol,NULL))
	{
		if(WSAGetLastError() != WSA_IO_PENDING)
			return FALSE;
	}
	return TRUE;
}


BOOL HandleIo(PBUFFER_OBJ pBuffer)
{
	if(pBuffer == NULL)
		return FALSE;


	PSOCKET_OBJ pSocket = pBuffer->pSocket;
	pSocket->nOutstandingOps--;


	DWORD dwTrans;
	DWORD dwFlags;
	BOOL bRet = WSAGetOverlappedResult(pSocket->s,&pBuffer->ol,&dwTrans,FALSE,&dwFlags);
	if(!bRet)
	{
		if(pSocket->s != INVALID_SOCKET)
		{
			closesocket(pSocket->s);
			pSocket->s = INVALID_SOCKET;
		}
		if(pBuffer->nOperation == OP_ACCEPT && pBuffer->sAccept != INVALID_SOCKET)
		{
			closesocket(pBuffer->sAccept);
			pBuffer->sAccept = INVALID_SOCKET;
		}
		if(pSocket->nOutstandingOps == 0)
		{
			FreeSocketObj(pSocket);
		}
		FreeBufferObj(pBuffer);
		return FALSE;
	}


	switch(pBuffer->nOperation)
	{
	case OP_ACCEPT:
		{
			if(dwTrans > 0)
			{
				pBuffer->buff[dwTrans] = 0;
				printf("Accept收到數據：%s\n",pBuffer->buff);


				PSOCKET_OBJ pClient = CreateSocketObj(pBuffer->sAccept);
				PBUFFER_OBJ pRecv = CreateBufferObj(pClient,BUFFER_SIZE);
				if(pRecv == NULL)
				{
					printf("Too much connections!\n");
					FreeSocketObj(pClient);
					return FALSE;
				}
				RebuildArray();
				if(!PostRecv(pRecv))
				{
					FreeSocketObj(pClient);
					FreeBufferObj(pBuffer);
					return FALSE;
				}
			}
			else
			{
				if(pSocket->s != INVALID_SOCKET)
				{
					closesocket(pSocket->s);
					pSocket->s = INVALID_SOCKET;
				}
				if(pBuffer->sAccept != INVALID_SOCKET)
				{
					closesocket(pBuffer->sAccept);
					pBuffer->sAccept = INVALID_SOCKET;
				}
				if(pSocket->nOutstandingOps == 0)
				{
					FreeSocketObj(pSocket);
				}
				FreeBufferObj(pBuffer);
			}
//			PBUFFER_OBJ pSend = CreateBufferObj(pClient,BUFFER_SIZE);
			//if(pSend == NULL)
			//{
			//	printf("Too much connections!\n");
			//	FreeSocketObj(pClient);
			//	return FALSE;
			//}
			//RebuildArray();
			//pSend->nLen = dwTrans;
			//memcpy(pSend->buff,pBuffer->buff,dwTrans);


			//if(!PostSend(pSend))
			//{
			//	FreeSocketObj(pSocket);
			//	FreeBufferObj(pBuffer);
			//	return FALSE;
			//}


			PostAccept(pBuffer);
		}break;
	case OP_READ:
		{
			if(dwTrans > 0)
			{
				pBuffer->buff[dwTrans] = 0;
				printf("Recv收到數據：%s\n",pBuffer->buff);
				PostRecv(pBuffer);
			}
			else
			{
				if(pSocket->s != INVALID_SOCKET)
				{
					closesocket(pSocket->s);
					pSocket->s = INVALID_SOCKET;
				}
				if(pSocket->nOutstandingOps == 0)
				{
					FreeSocketObj(pSocket);
				}
				FreeBufferObj(pBuffer);
			}
		}break;
	case OP_WRITE:
		{
			if(dwTrans > 0)
			{
				pBuffer->buff[dwTrans] = 0;
				printf("發送數據: %s 成功！\n",pBuffer->buff);
				FreeBufferObj(pBuffer);
			}
			else
			{
				if(pSocket->s != INVALID_SOCKET)
				{
					closesocket(pSocket->s);
					pSocket->s = INVALID_SOCKET;
				}
				if(pSocket->nOutstandingOps == 0)
				{
					FreeSocketObj(pSocket);
				}
				FreeBufferObj(pBuffer);
			}
		}break;
	}
}


DWORD WINAPI ControlThread(LPVOID lpParma)
{
	char cmd[128];
	while(scanf("%s",cmd))
	{
		if(cmd[0] == 's')
		{
			g_bServerRunning = FALSE;
			EnterCriticalSection(&g_cs);
			PBUFFER_OBJ pBuffer = g_pBufferHeader;
			while(pBuffer != NULL)
			{
				if(pBuffer->pSocket != NULL && pBuffer->pSocket->s != INVALID_SOCKET)
					closesocket(pBuffer->pSocket->s);
				pBuffer = pBuffer->pNext;
			}
			LeaveCriticalSection(&g_cs);
			break;
		}
	}
	return 0;
}


int main()
{
	InitializeCriticalSectionAndSpinCount(&g_cs,4000);
	WSAData wsaData;
	if(0 != WSAStartup(MAKEWORD(2,2),&wsaData))
	{
		printf("初始化失敗!%d\n",WSAGetLastError());
		Sleep(5000);
		return -1;
	}
	USHORT nport = 3456;
	SOCKET sListen = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(nport);
	sin.sin_addr.S_un.S_addr = ADDR_ANY;


	if(SOCKET_ERROR == bind(sListen,(sockaddr*)&sin,sizeof(sin)))
	{
		printf("bind failed!%d\n",WSAGetLastError());
		Sleep(5000);
		return -1;
	}


	listen(sListen,200);




	g_bServerRunning = TRUE;
	PSOCKET_OBJ pListen = CreateSocketObj(sListen);
	GUID GuidAcceptEx = WSAID_ACCEPTEX;
	DWORD dwBytes;
	WSAIoctl(pListen->s,
		SIO_GET_EXTENSION_FUNCTION_POINTER,
		&GuidAcceptEx,
		sizeof(GuidAcceptEx),
		&pListen->lpfnAcceptEx,
		sizeof(pListen->lpfnAcceptEx),
		&dwBytes,
		NULL,
		NULL);
	g_events[0] = WSACreateEvent();


	for(int i=0;i<5;++i)
	{
		PostAccept(CreateBufferObj(pListen,BUFFER_SIZE));
	}
	
	HANDLE hThread = CreateThread(NULL,0,ControlThread,NULL,0,NULL);
	while(TRUE)
	{
		int nIndex = WSAWaitForMultipleEvents(g_nBufferCount+1,g_events,FALSE,WSA_INFINITE,FALSE);
		if(nIndex == WSA_WAIT_FAILED)
		{
			printf("WSAWaitForMultipleEvents Failed!\n");
			break;
		}
		nIndex = nIndex - WSA_WAIT_EVENT_0;
		for(int i=nIndex;i<= g_nBufferCount;i++)
		{
			int nRet = WSAWaitForMultipleEvents(1,&g_events[i],FALSE,0,FALSE);
			if(nRet == WSA_WAIT_TIMEOUT)
				continue;


			if(i == 0)
			{			
				RebuildArray();
				continue;
			}


			PBUFFER_OBJ pBuffer = FindBufferObj(g_events[i]);
			if(pBuffer != NULL)
			{
				if(!HandleIo(pBuffer))
					RebuildArray();
			}
		}
		if(!g_bServerRunning && g_nBufferCount == 0)
			break;
	}
	WSACloseEvent(g_events[0]);
	WaitForSingleObject(hThread,INFINITE);
	CloseHandle(hThread);
	closesocket(sListen);
	WSACleanup();
	DeleteCriticalSection(&g_cs);
	return 0;
}

七，IOCP。

大框架爲書中例子，對強化了發送操作，部分異常處理，且加入了連接超時處理。

注意：當一個投遞完成，且對應socket上已經沒有未決的投遞，必須要再投遞一個請求或者關閉連接，否則socket對應的數據結構無法被釋放，對應socket連接斷開時也無法被

檢測到。所以如果業務邏輯結束，要關閉連接。或者你需要等客戶端來斷開連接，那麼你可以在業務邏輯結束後，再投遞一個接收請求（客戶端斷開時，接收請求返回且接收的字節數爲0，則此類中的異常處理邏輯便會將資源清理掉）。

頭文件

[cpp] view plain copy print ?

////////////////////////////////////////
// IOCP.h文件
#ifndef __IOCP_H__
#define __IOCP_H__
#include <winsock2.h>
#include <windows.h>
#include <Mswsock.h>
#define BUFFER_SIZE 1024*4 // I/O請求的緩衝區大小
#define MAX_THREAD 1 // I/O服務線程的數量
// 這是per-I/O數據。它包含了在套節字上處理I/O操作的必要信息
struct CIOCPBuffer
{
CIOCPBuffer()
{
memset(&ol,0,sizeof(WSAOVERLAPPED));
sClient = INVALID_SOCKET;
memset(buff,0,BUFFER_SIZE);
nLen = 0;
nSequenceNumber = 0;
bIsReleased = FALSE;
nOperation = 0;
pNext = NULL;
}
WSAOVERLAPPED ol;
SOCKET sClient; // AcceptEx接收的客戶方套節字
char buff[BUFFER_SIZE]; // I/O操作使用的緩衝區
int nLen; // buff緩衝區（使用的）大小
ULONG nSequenceNumber; // 此I/O的序列號
BOOL bIsReleased;
int nOperation; // 操作類型
#define OP_ACCEPT 1
#define OP_WRITE 2
#define OP_READ 3
CIOCPBuffer *pNext;
};
struct CIOCPNextToSend;
struct CIOCPTimerData;
// 這是per-Handle數據。它包含了一個套節字的信息
struct CIOCPContext
{
CIOCPContext()
{
s = INVALID_SOCKET;
memset(&addrLocal,0,sizeof(SOCKADDR_IN));
memset(&addrRemote,0,sizeof(SOCKADDR_IN));
bClosing = FALSE;
nOutstandingRecv = 0;
nOutstandingSend = 0;
nReadSequence = 0;
nCurrentReadSequence = 0;
nCurrentStep = 0;
pOutOfOrderReads = NULL;
pNextToSend = NULL;
bIsReleased = FALSE;
pNext = NULL;
pPreData = NULL;
strcpy(szClientName,"");
hTimer = NULL;
hCompletion = NULL;
}
CIOCPBuffer m_pBuffer;
SOCKET s; // 套節字句柄
SOCKADDR_IN addrLocal; // 連接的本地地址
SOCKADDR_IN addrRemote; // 連接的遠程地址
BOOL bClosing; // 套節字是否關閉
int nOutstandingRecv; // 此套節字上拋出的重疊操作的數量
int nOutstandingSend;
ULONG nReadSequence; // 安排給接收的下一個序列號
ULONG nCurrentReadSequence; // 當前要讀的序列號
CIOCPBuffer *pOutOfOrderReads; // 記錄沒有按順序完成的讀I/O
CIOCPNextToSend *pNextToSend; //xss,按順序發送的下一個要發送的。
LPVOID pPreData; //xss，用於2個過程之間的數據交流。
ULONG nCurrentStep;//xss,用於記錄當前處於的過程步驟數。
BOOL bIsReleased;
CRITICAL_SECTION Lock; // 保護這個結構
CIOCPContext *pNext;
char szClientName[256];//xss
HANDLE hTimer;//xss
HANDLE hCompletion;//xss
};
struct CIOCPNextToSend//xss
{
CIOCPBuffer * pBuffer;
CIOCPNextToSend * pNext;
};
struct CIOCPTimerData
{
CIOCPContext* pContext;
HANDLE hCompletion;
};
class CIOCPServer // 處理線程
{
public:
CIOCPServer();
~CIOCPServer();
// 開始服務
BOOL Start(int nPort = 3456, int nMaxConnections = 2000,
int nMaxFreeBuffers = 200, int nMaxFreeContexts = 100, int nInitialReads = 4);
// 停止服務
void Shutdown();
// 關閉一個連接和關閉所有連接
void CloseAConnection(CIOCPContext *pContext);
void CloseAllConnections();
// 取得當前的連接數量
ULONG GetCurrentConnection() { return m_nCurrentConnection; }
// 向指定客戶發送文本
BOOL SendText(CIOCPContext *pContext, char *pszText, int nLen);
protected:
// 申請和釋放緩衝區對象
CIOCPBuffer *AllocateBuffer(int nLen);
void ReleaseBuffer(CIOCPBuffer *pBuffer);
// 申請和釋放套節字上下文
CIOCPContext *AllocateContext(SOCKET s);
void ReleaseContext(CIOCPContext *pContext);
// 釋放空閒緩衝區對象列表和空閒上下文對象列表
void FreeBuffers();
void FreeContexts();
// 向連接列表中添加一個連接
BOOL AddAConnection(CIOCPContext *pContext);
// 插入和移除未決的接受請求
BOOL InsertPendingAccept(CIOCPBuffer *pBuffer);
BOOL RemovePendingAccept(CIOCPBuffer *pBuffer);
//xss,把要發送的數據加入隊列，按順序發送
BOOL PostSendToList(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
//xss,發送下一個需要發送的
BOOL PostNextWriteBuffer(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
// 取得下一個要讀取的
CIOCPBuffer *GetNextReadBuffer(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
void ErrorHandle(CIOCPContext *pContext, CIOCPBuffer *pBuffer);//xss,錯誤集中處理
// 投遞接受I/O、發送I/O、接收I/O
BOOL PostAccept(CIOCPBuffer *pBuffer);
BOOL PostSend(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
BOOL PostRecv(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
BOOL PostRecv2(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
void HandleIO(DWORD dwKey, CIOCPBuffer *pBuffer, DWORD dwTrans, int nError);
// 事件通知函數
// 建立了一個新的連接
virtual void OnConnectionEstablished(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
// 一個連接關閉
virtual void OnConnectionClosing(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
// 在一個連接上發生了錯誤
virtual void OnConnectionError(CIOCPContext *pContext, CIOCPBuffer *pBuffer, int nError);
// 一個連接上的讀操作完成
virtual void OnReadCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
// 一個連接上的寫操作完成
virtual void OnWriteCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
protected:
// 記錄空閒結構信息
CIOCPBuffer *m_pFreeBufferList;
CIOCPContext *m_pFreeContextList;
int m_nFreeBufferCount;
int m_nFreeContextCount;
CRITICAL_SECTION m_FreeBufferListLock;
CRITICAL_SECTION m_FreeContextListLock;
CRITICAL_SECTION m_HeapLock;
CRITICAL_SECTION m_RepostLock;
// 記錄拋出的Accept請求
CIOCPBuffer *m_pPendingAccepts; // 拋出請求列表。
long m_nPendingAcceptCount;
CRITICAL_SECTION m_PendingAcceptsLock;
// 記錄連接列表
CIOCPContext *m_pConnectionList;
int m_nCurrentConnection;
CRITICAL_SECTION m_ConnectionListLock;
// 用於投遞Accept請求
HANDLE m_hAcceptEvent;
HANDLE m_hRepostEvent;
LONG m_nRepostCount;
int m_nPort; // 服務器監聽的端口
int m_nInitialAccepts;
int m_nInitialReads;
int m_nMaxAccepts;
int m_nMaxSends;
int m_nMaxFreeBuffers;
int m_nMaxFreeContexts;
int m_nMaxConnections;
HANDLE m_hListenThread; // 監聽線程
HANDLE m_hCompletion; // 完成端口句柄
SOCKET m_sListen; // 監聽套節字句柄
LPFN_ACCEPTEX m_lpfnAcceptEx; // AcceptEx函數地址
LPFN_GETACCEPTEXSOCKADDRS m_lpfnGetAcceptExSockaddrs; // GetAcceptExSockaddrs函數地址
BOOL m_bShutDown; // 用於通知監聽線程退出
BOOL m_bServerStarted; // 記錄服務是否啓動
HANDLE m_hTimerQueue;//xss
private: // 線程函數
static DWORD WINAPI _ListenThreadProc(LPVOID lpParam);
static DWORD WINAPI _WorkerThreadProc(LPVOID lpParam);
};
#endif // __IOCP_H__

////////////////////////////////////////
// IOCP.h文件


#ifndef __IOCP_H__
#define __IOCP_H__


#include <winsock2.h>
#include <windows.h>
#include <Mswsock.h>


#define BUFFER_SIZE 1024*4		// I/O請求的緩衝區大小
#define MAX_THREAD	1			// I/O服務線程的數量




// 這是per-I/O數據。它包含了在套節字上處理I/O操作的必要信息
struct CIOCPBuffer
{
	CIOCPBuffer()
	{
		memset(&ol,0,sizeof(WSAOVERLAPPED));
		sClient = INVALID_SOCKET;
		memset(buff,0,BUFFER_SIZE);
		nLen = 0;
		nSequenceNumber = 0;
		bIsReleased = FALSE;
		nOperation = 0;
		pNext = NULL;
	}
	WSAOVERLAPPED ol;


	SOCKET sClient;			// AcceptEx接收的客戶方套節字


	char buff[BUFFER_SIZE];				// I/O操作使用的緩衝區
	int nLen;				// buff緩衝區（使用的）大小


	ULONG nSequenceNumber;	// 此I/O的序列號
	BOOL  bIsReleased;


	int nOperation;			// 操作類型
#define OP_ACCEPT	1
#define OP_WRITE	2
#define OP_READ		3


	CIOCPBuffer *pNext;
};
struct CIOCPNextToSend;
struct CIOCPTimerData;
// 這是per-Handle數據。它包含了一個套節字的信息
struct CIOCPContext
{
	CIOCPContext()
	{
		s = INVALID_SOCKET;
		memset(&addrLocal,0,sizeof(SOCKADDR_IN));
		memset(&addrRemote,0,sizeof(SOCKADDR_IN));
		bClosing = FALSE;
		nOutstandingRecv = 0;
		nOutstandingSend = 0;
		nReadSequence = 0;
		nCurrentReadSequence = 0;
		nCurrentStep = 0;
		pOutOfOrderReads = NULL;
		pNextToSend = NULL;
		bIsReleased = FALSE;
		pNext = NULL;
		pPreData = NULL;
		strcpy(szClientName,"");
		hTimer = NULL;
		hCompletion = NULL;
	}
	CIOCPBuffer m_pBuffer;
	SOCKET s;						// 套節字句柄


	SOCKADDR_IN addrLocal;			// 連接的本地地址
	SOCKADDR_IN addrRemote;			// 連接的遠程地址


	BOOL bClosing;					// 套節字是否關閉


	int nOutstandingRecv;			// 此套節字上拋出的重疊操作的數量
	int nOutstandingSend;           




	ULONG nReadSequence;			// 安排給接收的下一個序列號
	ULONG nCurrentReadSequence;		// 當前要讀的序列號

	CIOCPBuffer *pOutOfOrderReads;	// 記錄沒有按順序完成的讀I/O
	CIOCPNextToSend *pNextToSend;       //xss,按順序發送的下一個要發送的。


	LPVOID pPreData; //xss，用於2個過程之間的數據交流。
	ULONG  nCurrentStep;//xss,用於記錄當前處於的過程步驟數。
	BOOL   bIsReleased;


	CRITICAL_SECTION Lock;			// 保護這個結構


	CIOCPContext *pNext;


	char szClientName[256];//xss
	HANDLE hTimer;//xss
	HANDLE hCompletion;//xss


};


struct CIOCPNextToSend//xss
{
	CIOCPBuffer * pBuffer;
	CIOCPNextToSend * pNext;
};


struct CIOCPTimerData
{
	CIOCPContext* pContext;
	HANDLE hCompletion;
};


class CIOCPServer   // 處理線程
{
public:
	CIOCPServer();
	~CIOCPServer();


	// 開始服務
	BOOL Start(int nPort = 3456, int nMaxConnections = 2000, 
			int nMaxFreeBuffers = 200, int nMaxFreeContexts = 100, int nInitialReads = 4);
	// 停止服務
	void Shutdown();


	// 關閉一個連接和關閉所有連接
	void CloseAConnection(CIOCPContext *pContext);
	void CloseAllConnections();	


	// 取得當前的連接數量
	ULONG GetCurrentConnection() { return m_nCurrentConnection; }


	// 向指定客戶發送文本
	BOOL SendText(CIOCPContext *pContext, char *pszText, int nLen); 


protected:


	// 申請和釋放緩衝區對象
	CIOCPBuffer *AllocateBuffer(int nLen);
	void ReleaseBuffer(CIOCPBuffer *pBuffer);


	// 申請和釋放套節字上下文
	CIOCPContext *AllocateContext(SOCKET s);
	void ReleaseContext(CIOCPContext *pContext);


	// 釋放空閒緩衝區對象列表和空閒上下文對象列表
	void FreeBuffers();
	void FreeContexts();


	// 向連接列表中添加一個連接
	BOOL AddAConnection(CIOCPContext *pContext);


	// 插入和移除未決的接受請求
	BOOL InsertPendingAccept(CIOCPBuffer *pBuffer);
	BOOL RemovePendingAccept(CIOCPBuffer *pBuffer);


	//xss,把要發送的數據加入隊列，按順序發送
	BOOL PostSendToList(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
	//xss,發送下一個需要發送的
	BOOL PostNextWriteBuffer(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
	// 取得下一個要讀取的
	CIOCPBuffer *GetNextReadBuffer(CIOCPContext *pContext, CIOCPBuffer *pBuffer);




	void ErrorHandle(CIOCPContext *pContext, CIOCPBuffer *pBuffer);//xss,錯誤集中處理
	// 投遞接受I/O、發送I/O、接收I/O
	BOOL PostAccept(CIOCPBuffer *pBuffer);
	BOOL PostSend(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
	BOOL PostRecv(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
	BOOL PostRecv2(CIOCPContext *pContext, CIOCPBuffer *pBuffer);


	void HandleIO(DWORD dwKey, CIOCPBuffer *pBuffer, DWORD dwTrans, int nError);




		// 事件通知函數
	// 建立了一個新的連接
	virtual void OnConnectionEstablished(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
	// 一個連接關閉
	virtual void OnConnectionClosing(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
	// 在一個連接上發生了錯誤
	virtual void OnConnectionError(CIOCPContext *pContext, CIOCPBuffer *pBuffer, int nError);
	// 一個連接上的讀操作完成
	virtual void OnReadCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer);
	// 一個連接上的寫操作完成
	virtual void OnWriteCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer);


protected:


	// 記錄空閒結構信息
	CIOCPBuffer *m_pFreeBufferList;
	CIOCPContext *m_pFreeContextList;
	int m_nFreeBufferCount;
	int m_nFreeContextCount;	
	CRITICAL_SECTION m_FreeBufferListLock;
	CRITICAL_SECTION m_FreeContextListLock;


	CRITICAL_SECTION m_HeapLock;
	CRITICAL_SECTION m_RepostLock;


	// 記錄拋出的Accept請求
	CIOCPBuffer *m_pPendingAccepts;   // 拋出請求列表。
	long m_nPendingAcceptCount;
	CRITICAL_SECTION m_PendingAcceptsLock;


	// 記錄連接列表
	CIOCPContext *m_pConnectionList;
	int m_nCurrentConnection;
	CRITICAL_SECTION m_ConnectionListLock;


	// 用於投遞Accept請求
	HANDLE m_hAcceptEvent;
	HANDLE m_hRepostEvent;
	LONG m_nRepostCount;


	int m_nPort;				// 服務器監聽的端口


	int m_nInitialAccepts;
	int m_nInitialReads;
	int m_nMaxAccepts;
	int m_nMaxSends;
	int m_nMaxFreeBuffers;
	int m_nMaxFreeContexts;
	int m_nMaxConnections;


	HANDLE m_hListenThread;			// 監聽線程
	HANDLE m_hCompletion;			// 完成端口句柄
	SOCKET m_sListen;				// 監聽套節字句柄
	LPFN_ACCEPTEX m_lpfnAcceptEx;	// AcceptEx函數地址
	LPFN_GETACCEPTEXSOCKADDRS m_lpfnGetAcceptExSockaddrs; // GetAcceptExSockaddrs函數地址


	BOOL m_bShutDown;		// 用於通知監聽線程退出
	BOOL m_bServerStarted;	// 記錄服務是否啓動


	HANDLE m_hTimerQueue;//xss 


private:	// 線程函數
	static DWORD WINAPI _ListenThreadProc(LPVOID lpParam);
	static DWORD WINAPI _WorkerThreadProc(LPVOID lpParam);
};




#endif // __IOCP_H__

cpp文件

[cpp] view plain copy print ?

//////////////////////////////////////////////////
// IOCP.cpp文件
#define _WIN32_WINNT 0x0500 //xss
#include "iocp.h"
#pragma comment(lib, "WS2_32.lib")
#include <stdio.h>
#include "httpFun.h"
static int iBufferCount = 0;
static int iContextCount = 0;
CIOCPServer::CIOCPServer()
{
// 列表
m_pFreeBufferList = NULL;
m_pFreeContextList = NULL;
m_pPendingAccepts = NULL;
m_pConnectionList = NULL;
m_nFreeBufferCount = 0;
m_nFreeContextCount = 0;
m_nPendingAcceptCount = 0;
m_nCurrentConnection = 0;
::InitializeCriticalSection(&m_FreeBufferListLock);
::InitializeCriticalSection(&m_FreeContextListLock);
::InitializeCriticalSection(&m_PendingAcceptsLock);
::InitializeCriticalSection(&m_ConnectionListLock);
::InitializeCriticalSection(&m_HeapLock);
::InitializeCriticalSection(&m_RepostLock);
// Accept請求
m_hAcceptEvent = ::CreateEvent(NULL, FALSE, FALSE, NULL);
m_hRepostEvent = ::CreateEvent(NULL, FALSE, FALSE, NULL);
m_nRepostCount = 0;
m_nPort = 8888;
m_nInitialAccepts = 10;
m_nInitialReads = 4;
m_nMaxAccepts = 100;
m_nMaxSends = 20;
m_nMaxFreeBuffers = 200;
m_nMaxFreeContexts = 100;
m_nMaxConnections = 2000;
m_hListenThread = NULL;
m_hCompletion = NULL;
m_sListen = INVALID_SOCKET;
m_lpfnAcceptEx = NULL;
m_lpfnGetAcceptExSockaddrs = NULL;
m_bShutDown = FALSE;
m_bServerStarted = FALSE;
m_hTimerQueue = ::CreateTimerQueue();
// 初始化WS2_32.dll
WSADATA wsaData;
WORD sockVersion = MAKEWORD(2, 2);
::WSAStartup(sockVersion, &wsaData);
}
CIOCPServer::~CIOCPServer()
{
Shutdown();
if(m_sListen != INVALID_SOCKET)
::closesocket(m_sListen);
if(m_hListenThread != NULL)
::CloseHandle(m_hListenThread);
::CloseHandle(m_hRepostEvent);
::CloseHandle(m_hAcceptEvent);
::DeleteCriticalSection(&m_FreeBufferListLock);
::DeleteCriticalSection(&m_FreeContextListLock);
::DeleteCriticalSection(&m_PendingAcceptsLock);
::DeleteCriticalSection(&m_ConnectionListLock);
::DeleteCriticalSection(&m_HeapLock);
::DeleteCriticalSection(&m_RepostLock);
::DeleteTimerQueue(m_hTimerQueue);//xss
::WSACleanup();
}
///////////////////////////////////////
static VOID CALLBACK TimerRoutine(PVOID lpParam, BOOLEAN TimerOrWaitFired)
{
CIOCPContext* pContext = (CIOCPContext*)lpParam;
if(pContext != NULL && pContext->bClosing == FALSE)
{
EnterCriticalSection(&pContext->Lock);
if(pContext->hCompletion != NULL)
{
PostQueuedCompletionStatus(pContext->hCompletion,-2,(ULONG_PTR)pContext,NULL);
}
LeaveCriticalSection(&pContext->Lock);
}
}
///////////////////////////////////
// 自定義幫助函數
CIOCPBuffer *CIOCPServer::AllocateBuffer(int nLen)
{
CIOCPBuffer *pBuffer = NULL;
if(nLen > BUFFER_SIZE)
return NULL;
// 爲緩衝區對象申請內存
::EnterCriticalSection(&m_FreeBufferListLock);
if(m_pFreeBufferList == NULL) // 內存池爲空，申請新的內存
{
// pBuffer = (CIOCPBuffer *)::HeapAlloc(GetProcessHeap(),
// HEAP_ZERO_MEMORY, sizeof(CIOCPBuffer) + BUFFER_SIZE);
pBuffer = new CIOCPBuffer();
}
else // 從內存池中取一塊來使用
{
pBuffer = m_pFreeBufferList;
m_pFreeBufferList = m_pFreeBufferList->pNext;
pBuffer->pNext = NULL;
m_nFreeBufferCount --;
}
::LeaveCriticalSection(&m_FreeBufferListLock);
EnterCriticalSection(&m_HeapLock);
iBufferCount++;
LeaveCriticalSection(&m_HeapLock);
// 初始化新的緩衝區對象
if(pBuffer != NULL)
{
//pBuffer->buff = (char*)(pBuffer + sizeof(CIOCPBuffer)/*1*/);//xss,個人以爲應該+sizeof(CIOCPBuffer);
pBuffer->nLen = nLen;
pBuffer->bIsReleased = FALSE;
}
return pBuffer;
}
void CIOCPServer::ReleaseBuffer(CIOCPBuffer *pBuffer)
{
if(pBuffer == NULL || pBuffer->bIsReleased)
return;
::EnterCriticalSection(&m_FreeBufferListLock);
if(m_nFreeBufferCount <= m_nMaxFreeBuffers) // 將要釋放的內存添加到空閒列表中
{
memset(pBuffer, 0, sizeof(CIOCPBuffer) /*+ BUFFER_SIZE*/);
pBuffer->pNext = m_pFreeBufferList;
m_pFreeBufferList = pBuffer;
m_nFreeBufferCount ++ ;
pBuffer->bIsReleased = TRUE;
}
else // 已經達到最大值，真正的釋放內存
{
//::HeapFree(::GetProcessHeap(), 0, pBuffer);
delete pBuffer;
}
::LeaveCriticalSection(&m_FreeBufferListLock);
EnterCriticalSection(&m_HeapLock);
iBufferCount--;
LeaveCriticalSection(&m_HeapLock);
}
CIOCPContext *CIOCPServer::AllocateContext(SOCKET s)
{
CIOCPContext *pContext;
// 申請一個CIOCPContext對象
::EnterCriticalSection(&m_FreeContextListLock);
if(m_pFreeContextList == NULL)
{
//pContext = (CIOCPContext *)::HeapAlloc(::GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(CIOCPContext));
pContext = new CIOCPContext();
::InitializeCriticalSection(&pContext->Lock);
}
else
{
// 在空閒列表中申請
pContext = m_pFreeContextList;
m_pFreeContextList = m_pFreeContextList->pNext;
pContext->pNext = NULL;
m_nFreeBufferCount --;
}
::LeaveCriticalSection(&m_FreeContextListLock);
EnterCriticalSection(&m_HeapLock);
iContextCount++;
LeaveCriticalSection(&m_HeapLock);
// 初始化對象成員
if(pContext != NULL)
{
pContext->s = s;
pContext->bIsReleased = FALSE;
}
return pContext;
}
void CIOCPServer::ReleaseContext(CIOCPContext *pContext)
{
if(pContext == NULL || pContext->bIsReleased)
return;
printf("\n%s釋放了Context\n\n",pContext->szClientName);
if(pContext->s != INVALID_SOCKET)
::closesocket(pContext->s);
// 首先釋放（如果有的話）此套節字上的沒有按順序完成的讀I/O的緩衝區
CIOCPBuffer *pNext;
while(pContext->pOutOfOrderReads != NULL)
{
pNext = pContext->pOutOfOrderReads->pNext;
ReleaseBuffer(pContext->pOutOfOrderReads);
pContext->pOutOfOrderReads = pNext;
}
//xss,再釋放（如果有的話）此套接字上未完成的寫I/O緩衝區
CIOCPNextToSend* pSend = NULL;
while(pContext->pNextToSend != NULL)
{
pSend = pContext->pNextToSend->pNext;
if(pContext->pNextToSend->pBuffer != NULL && pContext->pNextToSend->pBuffer->bIsReleased == FALSE)
{
ReleaseBuffer(pContext->pNextToSend->pBuffer);
}
delete pContext->pNextToSend;
pContext->pNextToSend = pSend;
}
if(pContext->hTimer != NULL)
{
DeleteTimerQueueTimer(m_hTimerQueue,pContext->hTimer,NULL);
pContext->hTimer = NULL;
}
::EnterCriticalSection(&m_FreeContextListLock);
if(m_nFreeContextCount <= m_nMaxFreeContexts) // 添加到空閒列表
{
// 先將關鍵代碼段變量保存到一個臨時變量中
CRITICAL_SECTION cstmp = pContext->Lock;
// 將要釋放的上下文對象初始化爲0
memset(pContext, 0, sizeof(CIOCPContext));
// 再放會關鍵代碼段變量，將要釋放的上下文對象添加到空閒列表的表頭
pContext->Lock = cstmp;
pContext->pNext = m_pFreeContextList;
m_pFreeContextList = pContext;
// 更新計數
m_nFreeContextCount ++;
pContext->bIsReleased = TRUE;
}
else
{
::DeleteCriticalSection(&pContext->Lock);
//::HeapFree(::GetProcessHeap(), 0, pContext);
delete pContext;
}
::LeaveCriticalSection(&m_FreeContextListLock);
EnterCriticalSection(&m_HeapLock);
iContextCount--;
LeaveCriticalSection(&m_HeapLock);
}
void CIOCPServer::FreeBuffers()
{
// 遍歷m_pFreeBufferList空閒列表，釋放緩衝區池內存
::EnterCriticalSection(&m_FreeBufferListLock);
CIOCPBuffer *pFreeBuffer = m_pFreeBufferList;
CIOCPBuffer *pNextBuffer;
while(pFreeBuffer != NULL)
{
pNextBuffer = pFreeBuffer->pNext;
delete pFreeBuffer;
// if(!::HeapFree(::GetProcessHeap(), 0, pFreeBuffer))
// {
// #ifdef _DEBUG
// ::OutputDebugString(" FreeBuffers釋放內存出錯！");
// #endif // _DEBUG
// break;
// }
pFreeBuffer = pNextBuffer;
}
m_pFreeBufferList = NULL;
m_nFreeBufferCount = 0;
::LeaveCriticalSection(&m_FreeBufferListLock);
}
void CIOCPServer::FreeContexts()
{
// 遍歷m_pFreeContextList空閒列表，釋放緩衝區池內存
::EnterCriticalSection(&m_FreeContextListLock);
CIOCPContext *pFreeContext = m_pFreeContextList;
CIOCPContext *pNextContext;
while(pFreeContext != NULL)
{
pNextContext = pFreeContext->pNext;
::DeleteCriticalSection(&pFreeContext->Lock);
delete pFreeContext;
// if(!::HeapFree(::GetProcessHeap(), 0, pFreeContext))
// {
// #ifdef _DEBUG
// ::OutputDebugString(" FreeBuffers釋放內存出錯！");
// #endif // _DEBUG
// break;
// }
pFreeContext = pNextContext;
}
m_pFreeContextList = NULL;
m_nFreeContextCount = 0;
::LeaveCriticalSection(&m_FreeContextListLock);
}
BOOL CIOCPServer::AddAConnection(CIOCPContext *pContext)
{
// 向客戶連接列表添加一個CIOCPContext對象
::EnterCriticalSection(&m_ConnectionListLock);
if(m_nCurrentConnection <= m_nMaxConnections)
{
// 添加到表頭
pContext->pNext = m_pConnectionList;
m_pConnectionList = pContext;
// 更新計數
m_nCurrentConnection ++;
::LeaveCriticalSection(&m_ConnectionListLock);
return TRUE;
}
::LeaveCriticalSection(&m_ConnectionListLock);
return FALSE;
}
void CIOCPServer::CloseAConnection(CIOCPContext *pContext)
{
if(pContext == NULL || pContext->bClosing == TRUE)
return;
// 首先從列表中移除要關閉的連接
::EnterCriticalSection(&m_ConnectionListLock);
CIOCPContext* pTest = m_pConnectionList;
if(pTest == pContext)
{
m_pConnectionList = pContext->pNext;
m_nCurrentConnection --;
}
else
{
while(pTest != NULL && pTest->pNext != pContext)
pTest = pTest->pNext;
if(pTest != NULL)
{
pTest->pNext = pContext->pNext;
m_nCurrentConnection --;
}
}
::LeaveCriticalSection(&m_ConnectionListLock);
// 然後關閉客戶套節字
::EnterCriticalSection(&pContext->Lock);
if(pContext->s != INVALID_SOCKET)
{
::closesocket(pContext->s);
pContext->s = INVALID_SOCKET;
}
pContext->bClosing = TRUE;
::LeaveCriticalSection(&pContext->Lock);
}
void CIOCPServer::CloseAllConnections()
{
// 遍歷整個連接列表，關閉所有的客戶套節字
::EnterCriticalSection(&m_ConnectionListLock);
CIOCPContext *pContext = m_pConnectionList;
while(pContext != NULL)
{
::EnterCriticalSection(&pContext->Lock);
if(pContext->s != INVALID_SOCKET)
{
::closesocket(pContext->s);
pContext->s = INVALID_SOCKET;
}
pContext->bClosing = TRUE;
::LeaveCriticalSection(&pContext->Lock);
pContext = pContext->pNext;
}
m_pConnectionList = NULL;
m_nCurrentConnection = 0;
::LeaveCriticalSection(&m_ConnectionListLock);
}
BOOL CIOCPServer::InsertPendingAccept(CIOCPBuffer *pBuffer)
{
// 將一個I/O緩衝區對象插入到m_pPendingAccepts表中
::EnterCriticalSection(&m_PendingAcceptsLock);
if(m_pPendingAccepts == NULL)
m_pPendingAccepts = pBuffer;
else
{
pBuffer->pNext = m_pPendingAccepts;
m_pPendingAccepts = pBuffer;
}
m_nPendingAcceptCount ++;
::LeaveCriticalSection(&m_PendingAcceptsLock);
return TRUE;
}
BOOL CIOCPServer::RemovePendingAccept(CIOCPBuffer *pBuffer)
{
BOOL bResult = FALSE;
// 遍歷m_pPendingAccepts表，從中移除pBuffer所指向的緩衝區對象
::EnterCriticalSection(&m_PendingAcceptsLock);
CIOCPBuffer *pTest = m_pPendingAccepts;
if(pTest == pBuffer) // 如果是表頭元素
{
m_pPendingAccepts = pBuffer->pNext;
bResult = TRUE;
}
else // 不是表頭元素的話，就要遍歷這個表來查找了
{
while(pTest != NULL && pTest->pNext != pBuffer)
pTest = pTest->pNext;
if(pTest != NULL)
{
pTest->pNext = pBuffer->pNext;
bResult = TRUE;
}
}
// 更新計數
if(bResult)
m_nPendingAcceptCount --;
::LeaveCriticalSection(&m_PendingAcceptsLock);
return bResult;
}
void CIOCPServer::ErrorHandle(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
CloseAConnection(pContext);
}
BOOL CIOCPServer::PostSendToList(CIOCPContext *pContext, CIOCPBuffer *pBuffer)//xss
{
::EnterCriticalSection(&pContext->Lock);
CIOCPNextToSend *ptr = pContext->pNextToSend;
CIOCPNextToSend * pSend = new CIOCPNextToSend();
pSend->pBuffer = pBuffer;
pSend->pNext = NULL;
if(ptr == NULL)
{
printf("數據：%10.10s ...，被直接發送。\n",pBuffer->buff);
//::EnterCriticalSection(&pContext->Lock);
pContext->pNextToSend = pSend;
//::LeaveCriticalSection(&pContext->Lock);
if(!PostSend(pContext,pBuffer))//如果沒有需要等待的send就直接發送
{
::LeaveCriticalSection(&pContext->Lock);
return FALSE;
}
}
else
{
printf("數據：%10.10s ...，被放入鏈表結尾。\n",pBuffer->buff);
while(ptr->pNext != NULL)
{
ptr = ptr->pNext;
}
ptr->pNext = pSend;//新的發送請求放在鏈表結尾
}
::LeaveCriticalSection(&pContext->Lock);
return TRUE;
}
BOOL CIOCPServer::PostNextWriteBuffer(CIOCPContext *pContext, CIOCPBuffer *pBuffer)//xss
{
::EnterCriticalSection(&pContext->Lock);
CIOCPNextToSend* pSend = pContext->pNextToSend;
CIOCPNextToSend* pNextSend = NULL;
if(pSend != NULL && pSend->pNext != NULL)//發送成功的pBuffer是隊列的第一個，發送下一個，pNextToSend指向下一個，pBuffer由外面釋放。
{
pNextSend = pSend->pNext;
if(pNextSend->pBuffer != NULL)
{
printf("數據：%10.10s ...從鏈表中彈出被髮送。\n",pNextSend->pBuffer->buff);
if(!PostSend(pContext,pNextSend->pBuffer))
{
delete pSend;
pContext->pNextToSend = pNextSend;
::LeaveCriticalSection(&pContext->Lock);
return FALSE;
}
}
}
if(pSend != NULL)
{
pNextSend = pSend->pNext;
delete pSend;
pContext->pNextToSend = pNextSend;
}
::LeaveCriticalSection(&pContext->Lock);
return TRUE;
}
CIOCPBuffer *CIOCPServer::GetNextReadBuffer(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
if(pBuffer != NULL)
{
// 如果與要讀的下一個序列號相等，則讀這塊緩衝區
if(pBuffer->nSequenceNumber == pContext->nCurrentReadSequence)
{
return pBuffer;
}
// 如果不相等，則說明沒有按順序接收數據，將這塊緩衝區保存到連接的pOutOfOrderReads列表中
// 列表中的緩衝區是按照其序列號從小到大的順序排列的
pBuffer->pNext = NULL;
CIOCPBuffer *ptr = pContext->pOutOfOrderReads;
CIOCPBuffer *pPre = NULL;
while(ptr != NULL)
{
if(pBuffer->nSequenceNumber < ptr->nSequenceNumber)
break;
pPre = ptr;
ptr = ptr->pNext;
}
if(pPre == NULL) // 應該插入到表頭
{
pBuffer->pNext = pContext->pOutOfOrderReads;
pContext->pOutOfOrderReads = pBuffer;
}
else // 應該插入到表的中間
{
pBuffer->pNext = pPre->pNext;
pPre->pNext = pBuffer/*->pNext*/;//xss,個人覺得應該是pPre->pNext = pBuffer;
}
}
// 檢查表頭元素的序列號，如果與要讀的序列號一致，就將它從表中移除，返回給用戶
CIOCPBuffer *ptr = pContext->pOutOfOrderReads;
if(ptr != NULL && (ptr->nSequenceNumber == pContext->nCurrentReadSequence))
{
pContext->pOutOfOrderReads = ptr->pNext;
return ptr;
}
return NULL;
}
BOOL CIOCPServer::PostAccept(CIOCPBuffer *pBuffer) // 在監聽套節字上投遞Accept請求
{
// 設置I/O類型
pBuffer->nOperation = OP_ACCEPT;
// 投遞此重疊I/O
DWORD dwBytes;
pBuffer->sClient = ::WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);
BOOL b = m_lpfnAcceptEx(m_sListen,
pBuffer->sClient,
pBuffer->buff,
pBuffer->nLen - ((sizeof(sockaddr_in) + 16) * 2),//xss,第一次都是收一個cmd_header
sizeof(sockaddr_in) + 16,
sizeof(sockaddr_in) + 16,
&dwBytes,
&pBuffer->ol);
if(!b && ::WSAGetLastError() != WSA_IO_PENDING)
{
return FALSE;
}
if(pBuffer->nOperation == 0)
{
int x = 0;
}
return TRUE;
};
BOOL CIOCPServer::PostRecv(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
// 設置I/O類型
pBuffer->nOperation = OP_READ;
::EnterCriticalSection(&pContext->Lock);
// 設置序列號
pBuffer->nSequenceNumber = pContext->nReadSequence;
// 投遞此重疊I/O
DWORD dwBytes;
DWORD dwFlags = 0;
WSABUF buf;
buf.buf = pBuffer->buff;
buf.len = pBuffer->nLen;
if(::WSARecv(pContext->s, &buf, 1, &dwBytes, &dwFlags, &pBuffer->ol, NULL) != NO_ERROR)
{
if(::WSAGetLastError() != WSA_IO_PENDING)
{
printf("WSARecv出錯：%d\n",WSAGetLastError());
::LeaveCriticalSection(&pContext->Lock);
return FALSE;
}
}
// 增加套節字上的重疊I/O計數和讀序列號計數
pContext->nOutstandingRecv ++;
pContext->nReadSequence ++;
::LeaveCriticalSection(&pContext->Lock);
return TRUE;
}
BOOL CIOCPServer::PostSend(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
// 跟蹤投遞的發送的數量，防止用戶僅發送數據而不接收，導致服務器拋出大量發送操作
if(pContext->nOutstandingSend > m_nMaxSends)
return FALSE;
// 設置I/O類型，增加套節字上的重疊I/O計數
pBuffer->nOperation = OP_WRITE;
// 投遞此重疊I/O
DWORD dwBytes;
DWORD dwFlags = 0;
WSABUF buf;
buf.buf = pBuffer->buff;
buf.len = pBuffer->nLen;
if(::WSASend(pContext->s,
&buf, 1, &dwBytes, dwFlags, &pBuffer->ol, NULL) != NO_ERROR)
{
int x;
if((x=::WSAGetLastError()) != WSA_IO_PENDING)
{
printf("發送失敗！錯誤碼：%d",x);
return FALSE;
}
}
// 增加套節字上的重疊I/O計數
::EnterCriticalSection(&pContext->Lock);
pContext->nOutstandingSend ++;
::LeaveCriticalSection(&pContext->Lock);
if(pBuffer->nOperation == 0)
{
int x = 0;
}
return TRUE;
}
BOOL CIOCPServer::Start(int nPort, int nMaxConnections,
int nMaxFreeBuffers, int nMaxFreeContexts, int nInitialReads)
{
// 檢查服務是否已經啓動
if(m_bServerStarted)
return FALSE;
// 保存用戶參數
m_nPort = nPort;
m_nMaxConnections = nMaxConnections;
m_nMaxFreeBuffers = nMaxFreeBuffers;
m_nMaxFreeContexts = nMaxFreeContexts;
m_nInitialReads = nInitialReads;
// 初始化狀態變量
m_bShutDown = FALSE;
m_bServerStarted = TRUE;
// 創建監聽套節字，綁定到本地端口，進入監聽模式
m_sListen = ::WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);
SOCKADDR_IN si;
si.sin_family = AF_INET;
si.sin_port = ::ntohs(m_nPort);
si.sin_addr.S_un.S_addr = INADDR_ANY;
if(::bind(m_sListen, (sockaddr*)&si, sizeof(si)) == SOCKET_ERROR)
{
m_bServerStarted = FALSE;
return FALSE;
}
::listen(m_sListen, 200);
// 創建完成端口對象
m_hCompletion = ::CreateIoCompletionPort(INVALID_HANDLE_VALUE, 0, 0, 0);
// 加載擴展函數AcceptEx
GUID GuidAcceptEx = WSAID_ACCEPTEX;
DWORD dwBytes;
::WSAIoctl(m_sListen,
SIO_GET_EXTENSION_FUNCTION_POINTER,
&GuidAcceptEx,
sizeof(GuidAcceptEx),
&m_lpfnAcceptEx,
sizeof(m_lpfnAcceptEx),
&dwBytes,
NULL,
NULL);
// 加載擴展函數GetAcceptExSockaddrs
GUID GuidGetAcceptExSockaddrs = WSAID_GETACCEPTEXSOCKADDRS;
::WSAIoctl(m_sListen,
SIO_GET_EXTENSION_FUNCTION_POINTER,
&GuidGetAcceptExSockaddrs,
sizeof(GuidGetAcceptExSockaddrs),
&m_lpfnGetAcceptExSockaddrs,
sizeof(m_lpfnGetAcceptExSockaddrs),
&dwBytes,
NULL,
NULL
);
// 將監聽套節字關聯到完成端口，注意，這裏爲它傳遞的CompletionKey爲0
::CreateIoCompletionPort((HANDLE)m_sListen, m_hCompletion, (DWORD)0, 0);
// 註冊FD_ACCEPT事件。
// 如果投遞的AcceptEx I/O不夠，線程會接收到FD_ACCEPT網絡事件，說明應該投遞更多的AcceptEx I/O
WSAEventSelect(m_sListen, m_hAcceptEvent, FD_ACCEPT);
// 創建監聽線程
m_hListenThread = ::CreateThread(NULL, 0, _ListenThreadProc, this, 0, NULL);
return TRUE;
}
void CIOCPServer::Shutdown()
{
if(!m_bServerStarted)
return;
// 通知監聽線程，馬上停止服務
m_bShutDown = TRUE;
::SetEvent(m_hAcceptEvent);
// 等待監聽線程退出
::WaitForSingleObject(m_hListenThread, INFINITE);
::CloseHandle(m_hListenThread);
m_hListenThread = NULL;
m_bServerStarted = FALSE;
}
DWORD WINAPI CIOCPServer::_ListenThreadProc(LPVOID lpParam)
{
CIOCPServer *pThis = (CIOCPServer*)lpParam;
// 先在監聽套節字上投遞幾個Accept I/O
CIOCPBuffer *pBuffer;
for(int i=0; i<pThis->m_nInitialAccepts; i++)
{
pBuffer = pThis->AllocateBuffer(BUFFER_SIZE);//xss,BUFFER_SIZE
if(pBuffer == NULL)
return -1;
pThis->InsertPendingAccept(pBuffer);
pThis->PostAccept(pBuffer);
}
// 構建事件對象數組，以便在上面調用WSAWaitForMultipleEvents函數
HANDLE hWaitEvents[2 + MAX_THREAD];
int nEventCount = 0;
hWaitEvents[nEventCount ++] = pThis->m_hAcceptEvent;
hWaitEvents[nEventCount ++] = pThis->m_hRepostEvent;
// 創建指定數量的工作線程在完成端口上處理I/O
for(int i=0; i<MAX_THREAD; i++)
{
hWaitEvents[nEventCount ++] = ::CreateThread(NULL, 0, _WorkerThreadProc, pThis, 0, NULL);
}
// 下面進入無限循環，處理事件對象數組中的事件
while(TRUE)
{
int nIndex = ::WSAWaitForMultipleEvents(nEventCount, hWaitEvents, FALSE, 60*1000, FALSE);
// 首先檢查是否要停止服務
if(pThis->m_bShutDown || nIndex == WSA_WAIT_FAILED)
{
// 關閉所有連接
pThis->CloseAllConnections();
::Sleep(0); // 給I/O工作線程一個執行的機會
// 關閉監聽套節字
::closesocket(pThis->m_sListen);
pThis->m_sListen = INVALID_SOCKET;
::Sleep(0); // 給I/O工作線程一個執行的機會
// 通知所有I/O處理線程退出
for(int i=2; i<MAX_THREAD + 2; i++)
{
::PostQueuedCompletionStatus(pThis->m_hCompletion, -1, 0, NULL);
}
// 等待I/O處理線程退出
::WaitForMultipleObjects(MAX_THREAD, &hWaitEvents[2], TRUE, 5*1000);
for(int i=2; i<MAX_THREAD + 2; i++)
{
::CloseHandle(hWaitEvents[i]);
}
::CloseHandle(pThis->m_hCompletion);
pThis->FreeBuffers();
pThis->FreeContexts();
::ExitThread(0);
}
// 1）定時檢查所有未返回的AcceptEx I/O的連接建立了多長時間
if(nIndex == WSA_WAIT_TIMEOUT)
{
pBuffer = pThis->m_pPendingAccepts;
while(pBuffer != NULL)
{
int nSeconds;
int nLen = sizeof(nSeconds);
// 取得連接建立的時間
::getsockopt(pBuffer->sClient,
SOL_SOCKET, SO_CONNECT_TIME, (char *)&nSeconds, &nLen);
// 如果超過2分鐘客戶還不發送初始數據，就讓這個客戶go away
if(nSeconds != -1 && nSeconds > /*2*60*/50)
{
closesocket(pBuffer->sClient);
pBuffer->sClient = INVALID_SOCKET;
}
pBuffer = pBuffer->pNext;
}
}
else
{
nIndex = nIndex - WAIT_OBJECT_0;
WSANETWORKEVENTS ne;
int nLimit=0;
if(nIndex == 0) // 2）m_hAcceptEvent事件對象受信，說明投遞的Accept請求不夠，需要增加
{
::WSAEnumNetworkEvents(pThis->m_sListen, hWaitEvents[nIndex], &ne);
if(ne.lNetworkEvents & FD_ACCEPT)
{
nLimit = 50; // 增加的個數，這裏設爲50個
}
}
else if(nIndex == 1) // 3）m_hRepostEvent事件對象受信，說明處理I/O的線程接受到新的客戶
{
nLimit = InterlockedExchange(&pThis->m_nRepostCount, 0);
}
else if(nIndex > 1) // I/O服務線程退出，說明有錯誤發生，關閉服務器
{
pThis->m_bShutDown = TRUE;
continue;
}
// 投遞nLimit個AcceptEx I/O請求
int i = 0;
while(i++ < nLimit && pThis->m_nPendingAcceptCount < pThis->m_nMaxAccepts)
{
pBuffer = pThis->AllocateBuffer(BUFFER_SIZE);
if(pBuffer != NULL)
{
pThis->InsertPendingAccept(pBuffer);
pThis->PostAccept(pBuffer);
}
}
}
}
return 0;
}
DWORD WINAPI CIOCPServer::_WorkerThreadProc(LPVOID lpParam)
{
#ifdef _DEBUG
::OutputDebugString(" WorkerThread 啓動... \n");
#endif // _DEBUG
CIOCPServer *pThis = (CIOCPServer*)lpParam;
CIOCPBuffer *pBuffer = NULL;
DWORD dwKey;
DWORD dwTrans;
LPOVERLAPPED lpol;
while(TRUE)
{
// 在關聯到此完成端口的所有套節字上等待I/O完成
BOOL bOK = ::GetQueuedCompletionStatus(pThis->m_hCompletion,
&dwTrans, (LPDWORD)&dwKey, (LPOVERLAPPED*)&lpol, WSA_INFINITE);
if(dwTrans == -1) // 用戶通知退出
{
#ifdef _DEBUG
::OutputDebugString(" WorkerThread 退出 \n");
#endif // _DEBUG
::ExitThread(0);
}
if(dwTrans != -2)
pBuffer = CONTAINING_RECORD(lpol, CIOCPBuffer, ol);
int nError = NO_ERROR;
if(!bOK) // 在此套節字上有錯誤發生
{
printf("完成端口套接字上有錯誤：%d\n",GetLastError());
SOCKET s;
if(pBuffer->nOperation == OP_ACCEPT)
{
s = pThis->m_sListen;
}
else
{
if(dwKey == 0)
break;
s = ((CIOCPContext*)dwKey)->s;
}
DWORD dwFlags = 0;
if(!::WSAGetOverlappedResult(s, &pBuffer->ol, &dwTrans, FALSE, &dwFlags))
{
nError = ::WSAGetLastError();
}
}
pThis->HandleIO(dwKey, pBuffer, dwTrans, nError);
printf("Buffer:%d Context:%d\n",iBufferCount,iContextCount);
}
#ifdef _DEBUG
::OutputDebugString(" WorkerThread 退出 \n");
#endif // _DEBUG
return 0;
}
int g_x = 0;
void CIOCPServer::HandleIO(DWORD dwKey, CIOCPBuffer *pBuffer, DWORD dwTrans, int nError)
{
CIOCPContext *pContext = (CIOCPContext *)dwKey;
#ifdef _DEBUG
::OutputDebugString(" HandleIO... \n");
#endif // _DEBUG
// 1）首先減少套節字上的未決I/O計數
if(dwTrans == -2)
{
CloseAConnection(pContext);
return;
}
if(pContext != NULL)
{
::EnterCriticalSection(&pContext->Lock);
if(pBuffer->nOperation == OP_READ)
pContext->nOutstandingRecv --;
else if(pBuffer->nOperation == OP_WRITE)
pContext->nOutstandingSend --;
::LeaveCriticalSection(&pContext->Lock);
// 2）檢查套節字是否已經被我們關閉
if(pContext->bClosing)
{
#ifdef _DEBUG
::OutputDebugString(" 檢查到套節字已經被我們關閉 \n");
#endif // _DEBUG
if(pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
{
ReleaseContext(pContext);
pContext = NULL;
}
// 釋放已關閉套節字的未決I/O
ReleaseBuffer(pBuffer);
pBuffer = NULL;
return;
}
}
else
{
RemovePendingAccept(pBuffer);
}
// 3）檢查套節字上發生的錯誤，如果有的話，通知用戶，然後關閉套節字
if(nError != NO_ERROR)
{
if(pBuffer->nOperation != OP_ACCEPT)
{
OnConnectionError(pContext, pBuffer, nError);
CloseAConnection(pContext);
if(pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
{
ReleaseContext(pContext);
pContext = NULL;
}
#ifdef _DEBUG
::OutputDebugString(" 檢查到客戶套節字上發生錯誤 \n");
#endif // _DEBUG
}
else // 在監聽套節字上發生錯誤，也就是監聽套節字處理的客戶出錯了
{
// 客戶端出錯，釋放I/O緩衝區
if(pBuffer->sClient != INVALID_SOCKET)
{
::closesocket(pBuffer->sClient);
pBuffer->sClient = INVALID_SOCKET;
}
#ifdef _DEBUG
::OutputDebugString(" 檢查到監聽套節字上發生錯誤 \n");
#endif // _DEBUG
}
ReleaseBuffer(pBuffer);
pBuffer = NULL;
return;
}
// 開始處理
if(pBuffer->nOperation == OP_ACCEPT)
{
if(dwTrans == 0)
{
#ifdef _DEBUG
::OutputDebugString(" 監聽套節字上客戶端關閉 \n");
#endif // _DEBUG
if(pBuffer->sClient != INVALID_SOCKET)
{
::closesocket(pBuffer->sClient);
pBuffer->sClient = INVALID_SOCKET;
}
}
else
{
// 爲新接受的連接申請客戶上下文對象
CIOCPContext *pClient = AllocateContext(pBuffer->sClient);
if(pClient != NULL)
{
if(AddAConnection(pClient))
{
// 取得客戶地址
int nLocalLen, nRmoteLen;
LPSOCKADDR pLocalAddr, pRemoteAddr;
m_lpfnGetAcceptExSockaddrs(
pBuffer->buff,
pBuffer->nLen - (sizeof(sockaddr_in) + 16) * 2/*sizeof(cmd_header)*/,
sizeof(sockaddr_in) + 16,
sizeof(sockaddr_in) + 16,
(SOCKADDR **)&pLocalAddr,
&nLocalLen,
(SOCKADDR **)&pRemoteAddr,
&nRmoteLen);
memcpy(&pClient->addrLocal, pLocalAddr, nLocalLen);
memcpy(&pClient->addrRemote, pRemoteAddr, nRmoteLen);
// 關聯新連接到完成端口對象
::CreateIoCompletionPort((HANDLE)pClient->s, m_hCompletion, (DWORD)pClient, 0);
// 通知用戶
pBuffer->nLen = dwTrans;
OnConnectionEstablished(pClient, pBuffer);
if(pClient->bClosing && pClient->nOutstandingRecv == 0 && pClient->nOutstandingSend == 0)
{
ReleaseContext(pClient);
pContext = NULL;
}
else if(pClient->hTimer == NULL)//接收一個客戶端的同時創建一個檢測I/O超時的Timer
{
pClient->hCompletion = m_hCompletion;
CreateTimerQueueTimer(&pClient->hTimer,m_hTimerQueue,(WAITORTIMERCALLBACK)TimerRoutine,(PVOID)pClient,60*1000,0,0);
}
// 向新連接投遞Read請求或者Write請求，直接關閉這些空間在套節字關閉或出錯時釋放
// CIOCPBuffer *p = AllocateBuffer(BUFFER_SIZE);
// if(p != NULL)
// {
// if(!PostRecv(pClient, p))
// {
// CloseAConnection(pClient);
// }
// }
}
else // 連接數量已滿，關閉連接
{
CloseAConnection(pClient);
ReleaseContext(pClient);
pContext = NULL;
}
}
else
{
// 資源不足，關閉與客戶的連接即可
::closesocket(pBuffer->sClient);
pBuffer->sClient = INVALID_SOCKET;
}
}
// Accept請求完成，釋放I/O緩衝區
ReleaseBuffer(pBuffer);
pBuffer = NULL;
// 通知監聽線程繼續再投遞一個Accept請求
::InterlockedIncrement(&m_nRepostCount);
::SetEvent(m_hRepostEvent);
}
else if(pBuffer->nOperation == OP_READ)
{
if(dwTrans == 0) // 對方關閉套節字
{
// 先通知用戶
pBuffer->nLen = 0;
OnConnectionClosing(pContext, pBuffer);
// 再關閉連接
CloseAConnection(pContext);
// 釋放客戶上下文和緩衝區對象
if(pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
{
ReleaseContext(pContext);
pContext = NULL;
}
ReleaseBuffer(pBuffer);
pBuffer = NULL;
}
else
{
pBuffer->nLen = dwTrans;
// 按照I/O投遞的順序讀取接收到的數據
CIOCPBuffer *p = GetNextReadBuffer(pContext, pBuffer);
while(p != NULL)
{
// 通知用戶
OnReadCompleted(pContext, p);
// 增加要讀的序列號的值
::InterlockedIncrement((LONG*)&pContext->nCurrentReadSequence);
// 釋放這個已完成的I/O
ReleaseBuffer(p);
p = GetNextReadBuffer(pContext, NULL);
}
if(pContext->bClosing && pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
{
ReleaseContext(pContext);
pContext = NULL;
}
else if(pContext->hTimer != NULL)
{
ChangeTimerQueueTimer(m_hTimerQueue,pContext->hTimer,60*1000,0);//重置監視時間，當一個投遞完成後，60s內無任何交互則斷開。
}
// 繼續投遞一個新的接收請求
// pBuffer = AllocateBuffer(BUFFER_SIZE);
//if(pBuffer == NULL || !PostRecv(pContext, pBuffer))
//{
// CloseAConnection(pContext);
//}
}
}
else if(pBuffer->nOperation == OP_WRITE)
{
if(dwTrans == 0) // 對方關閉套節字
{
// 先通知用戶
pBuffer->nLen = 0;
OnConnectionClosing(pContext, pBuffer);
// 再關閉連接
CloseAConnection(pContext);
// 釋放客戶上下文和緩衝區對象
if(pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
{
ReleaseContext(pContext);
pContext = NULL;
}
ReleaseBuffer(pBuffer);
pBuffer = NULL;
}
else
{
if(pContext->bClosing && pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
{
ReleaseContext(pContext);
pContext = NULL;
ReleaseBuffer(pBuffer);
pBuffer = NULL;
return;
}
else if(pContext->hTimer != NULL)
{
ChangeTimerQueueTimer(m_hTimerQueue,pContext->hTimer,60*1000,0);
}
// 寫操作完成，通知用戶
if(dwTrans < pBuffer->nLen)//如果此send沒有發送完全，則發送剩下的部分（此部分如果還是沒發完全，這裏同樣進行）
{
printf("send未發送完全，發送：%d，總長度：%d\n",dwTrans,pBuffer->nLen);
CIOCPBuffer* p = AllocateBuffer(pBuffer->nLen - dwTrans);
if(p != NULL)
memcpy(p->buff,pBuffer->buff + dwTrans,pBuffer->nLen - dwTrans);
if(p == NULL || !PostSend(pContext,p))
{
CloseAConnection(pContext);
return;
}
}
else
{
if(!PostNextWriteBuffer(pContext,pBuffer))
{
CloseAConnection(pContext);
return;
}
}
pBuffer->nLen = dwTrans;
OnWriteCompleted(pContext, pBuffer);
if(pContext->bClosing && pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
{
ReleaseContext(pContext);
pContext = NULL;
}
// 釋放SendText函數申請的緩衝區
ReleaseBuffer(pBuffer);
pBuffer = NULL;
}
}
}
BOOL CIOCPServer::SendText(CIOCPContext *pContext, char *pszText, int nLen)
{
CIOCPBuffer *pBuffer = AllocateBuffer(nLen);
if(pBuffer != NULL)
{
memcpy(pBuffer->buff, pszText, nLen);
return PostSend(pContext, pBuffer);
}
return FALSE;
}
//投遞接收請求示例
//CIOCPBuffer *p = AllocateBuffer(BUFFER_SIZE);
//if(p != NULL)
//{
// if(!PostRecv(pContext, p))
// {
// CloseAConnection(pContext);
// }
//}
//投遞發送請求示例
//CIOCPBuffer *p = AllocateBuffer(BUFFER_SIZE);
//if(p != NULL)
//{
// if(!PostSendToList(pContext, p))
// {
// CloseAConnection(pContext);
// }
//}
void CIOCPServer::OnConnectionEstablished(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
//連接建立，且第一次數據接收完成。
//接下來可以根據業務邏輯，PostRecv收或者PostSendToList發或者CloseAConnection(pContext)關閉連接
}
void CIOCPServer::OnConnectionClosing(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
}
void CIOCPServer::OnReadCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
//一次數據接收完成。
//接下來可以根據業務邏輯，PostRecv收或者PostSendToList發或者CloseAConnection(pContext)關閉連接
}
void CIOCPServer::OnWriteCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
//一次數據發送完成。
//接下來可以根據業務邏輯，PostRecv收或者PostSendToList發或者CloseAConnection(pContext)關閉連接
}
void CIOCPServer::OnConnectionError(CIOCPContext *pContext, CIOCPBuffer *pBuffer, int nError)
{
}

//////////////////////////////////////////////////
// IOCP.cpp文件
#define _WIN32_WINNT 0x0500 //xss


#include "iocp.h"
#pragma comment(lib, "WS2_32.lib")


#include <stdio.h>
#include "httpFun.h"


static int iBufferCount = 0;
static int iContextCount = 0;
CIOCPServer::CIOCPServer()
{
	// 列表
	m_pFreeBufferList = NULL;
	m_pFreeContextList = NULL;	
	m_pPendingAccepts = NULL;
	m_pConnectionList = NULL;


	m_nFreeBufferCount = 0;
	m_nFreeContextCount = 0;
	m_nPendingAcceptCount = 0;
	m_nCurrentConnection = 0;


	::InitializeCriticalSection(&m_FreeBufferListLock);
	::InitializeCriticalSection(&m_FreeContextListLock);
	::InitializeCriticalSection(&m_PendingAcceptsLock);
	::InitializeCriticalSection(&m_ConnectionListLock);


	::InitializeCriticalSection(&m_HeapLock);
	::InitializeCriticalSection(&m_RepostLock);


	// Accept請求
	m_hAcceptEvent = ::CreateEvent(NULL, FALSE, FALSE, NULL);
	m_hRepostEvent = ::CreateEvent(NULL, FALSE, FALSE, NULL);
	m_nRepostCount = 0;


	m_nPort = 8888;


	m_nInitialAccepts = 10;
	m_nInitialReads = 4;
	m_nMaxAccepts = 100;
	m_nMaxSends = 20;
	m_nMaxFreeBuffers = 200;
	m_nMaxFreeContexts = 100;
	m_nMaxConnections = 2000;


	m_hListenThread = NULL;
	m_hCompletion = NULL;
	m_sListen = INVALID_SOCKET;
	m_lpfnAcceptEx = NULL;
	m_lpfnGetAcceptExSockaddrs = NULL;


	m_bShutDown = FALSE;
	m_bServerStarted = FALSE;


	m_hTimerQueue = ::CreateTimerQueue();


	// 初始化WS2_32.dll
	WSADATA wsaData;
	WORD sockVersion = MAKEWORD(2, 2);
	::WSAStartup(sockVersion, &wsaData);
}


CIOCPServer::~CIOCPServer()
{
	Shutdown();


	if(m_sListen != INVALID_SOCKET)
		::closesocket(m_sListen);
	if(m_hListenThread != NULL)
		::CloseHandle(m_hListenThread);


	::CloseHandle(m_hRepostEvent);
	::CloseHandle(m_hAcceptEvent);


	::DeleteCriticalSection(&m_FreeBufferListLock);
	::DeleteCriticalSection(&m_FreeContextListLock);
	::DeleteCriticalSection(&m_PendingAcceptsLock);
	::DeleteCriticalSection(&m_ConnectionListLock);


	::DeleteCriticalSection(&m_HeapLock);
	::DeleteCriticalSection(&m_RepostLock);


	::DeleteTimerQueue(m_hTimerQueue);//xss
	::WSACleanup();	
}


///////////////////////////////////////
static VOID CALLBACK TimerRoutine(PVOID lpParam, BOOLEAN TimerOrWaitFired)
{
	CIOCPContext* pContext = (CIOCPContext*)lpParam;
	if(pContext != NULL && pContext->bClosing == FALSE)
	{
		EnterCriticalSection(&pContext->Lock);
		if(pContext->hCompletion != NULL)
		{
			PostQueuedCompletionStatus(pContext->hCompletion,-2,(ULONG_PTR)pContext,NULL);
		}
		LeaveCriticalSection(&pContext->Lock);
	}
}






///////////////////////////////////
// 自定義幫助函數


CIOCPBuffer *CIOCPServer::AllocateBuffer(int nLen)
{
	CIOCPBuffer *pBuffer = NULL;
	if(nLen > BUFFER_SIZE)
		return NULL;


	// 爲緩衝區對象申請內存
	::EnterCriticalSection(&m_FreeBufferListLock);
	if(m_pFreeBufferList == NULL)  // 內存池爲空，申請新的內存
	{
// 		pBuffer = (CIOCPBuffer *)::HeapAlloc(GetProcessHeap(), 
// 						HEAP_ZERO_MEMORY, sizeof(CIOCPBuffer) + BUFFER_SIZE);
		pBuffer = new CIOCPBuffer();
	}
	else	// 從內存池中取一塊來使用
	{
		pBuffer = m_pFreeBufferList;
		m_pFreeBufferList = m_pFreeBufferList->pNext;	
		pBuffer->pNext = NULL;
		m_nFreeBufferCount --;
	}
	::LeaveCriticalSection(&m_FreeBufferListLock);


	EnterCriticalSection(&m_HeapLock);
	iBufferCount++;
	LeaveCriticalSection(&m_HeapLock);


	// 初始化新的緩衝區對象
	if(pBuffer != NULL)
	{
		//pBuffer->buff = (char*)(pBuffer + sizeof(CIOCPBuffer)/*1*/);//xss,個人以爲應該+sizeof(CIOCPBuffer);
		pBuffer->nLen = nLen;
		pBuffer->bIsReleased = FALSE;
	}
	return pBuffer;
}


void CIOCPServer::ReleaseBuffer(CIOCPBuffer *pBuffer)
{
	if(pBuffer == NULL || pBuffer->bIsReleased)
		return;


	::EnterCriticalSection(&m_FreeBufferListLock);


	if(m_nFreeBufferCount <= m_nMaxFreeBuffers)	// 將要釋放的內存添加到空閒列表中
	{
		memset(pBuffer, 0, sizeof(CIOCPBuffer) /*+ BUFFER_SIZE*/);
		pBuffer->pNext = m_pFreeBufferList;
		m_pFreeBufferList = pBuffer;


		m_nFreeBufferCount ++ ;


		pBuffer->bIsReleased = TRUE;
	}
	else			// 已經達到最大值，真正的釋放內存
	{
		//::HeapFree(::GetProcessHeap(), 0, pBuffer);
		delete pBuffer;
	}


	::LeaveCriticalSection(&m_FreeBufferListLock);


	EnterCriticalSection(&m_HeapLock);
	iBufferCount--;
	LeaveCriticalSection(&m_HeapLock);
}




CIOCPContext *CIOCPServer::AllocateContext(SOCKET s)
{
	CIOCPContext *pContext;


	// 申請一個CIOCPContext對象
	::EnterCriticalSection(&m_FreeContextListLock);


	if(m_pFreeContextList == NULL)
	{
 		//pContext = (CIOCPContext *)::HeapAlloc(::GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(CIOCPContext));
		pContext = new CIOCPContext();


		::InitializeCriticalSection(&pContext->Lock);
	}
	else	
	{
		// 在空閒列表中申請
		pContext = m_pFreeContextList;
		m_pFreeContextList = m_pFreeContextList->pNext;
		pContext->pNext = NULL;
		m_nFreeBufferCount --;
	}
	::LeaveCriticalSection(&m_FreeContextListLock);


	EnterCriticalSection(&m_HeapLock);
	iContextCount++;
    LeaveCriticalSection(&m_HeapLock);


	// 初始化對象成員
	if(pContext != NULL)
	{
		pContext->s = s;
		pContext->bIsReleased = FALSE;
	}
	return pContext;
}


void CIOCPServer::ReleaseContext(CIOCPContext *pContext)
{
	if(pContext == NULL || pContext->bIsReleased)
		return;


	printf("\n%s釋放了Context\n\n",pContext->szClientName);
	if(pContext->s != INVALID_SOCKET)
		::closesocket(pContext->s);


	// 首先釋放（如果有的話）此套節字上的沒有按順序完成的讀I/O的緩衝區
	CIOCPBuffer *pNext;
	while(pContext->pOutOfOrderReads != NULL)
	{
		pNext = pContext->pOutOfOrderReads->pNext;
		ReleaseBuffer(pContext->pOutOfOrderReads);
		pContext->pOutOfOrderReads = pNext;
	}


    //xss,再釋放（如果有的話）此套接字上未完成的寫I/O緩衝區
	CIOCPNextToSend* pSend = NULL;
	while(pContext->pNextToSend != NULL)
	{
		pSend = pContext->pNextToSend->pNext;
		if(pContext->pNextToSend->pBuffer != NULL && pContext->pNextToSend->pBuffer->bIsReleased == FALSE)
		{
			ReleaseBuffer(pContext->pNextToSend->pBuffer);
		}
		delete pContext->pNextToSend;
		pContext->pNextToSend = pSend;
	}


	if(pContext->hTimer != NULL)
	{
		DeleteTimerQueueTimer(m_hTimerQueue,pContext->hTimer,NULL);
        pContext->hTimer = NULL;	
	}


	::EnterCriticalSection(&m_FreeContextListLock);
	
	if(m_nFreeContextCount <= m_nMaxFreeContexts) // 添加到空閒列表
	{
		// 先將關鍵代碼段變量保存到一個臨時變量中
		CRITICAL_SECTION cstmp = pContext->Lock;
		// 將要釋放的上下文對象初始化爲0
		memset(pContext, 0, sizeof(CIOCPContext));


		// 再放會關鍵代碼段變量，將要釋放的上下文對象添加到空閒列表的表頭
		pContext->Lock = cstmp;
		pContext->pNext = m_pFreeContextList;
		m_pFreeContextList = pContext;
		
		// 更新計數
		m_nFreeContextCount ++;


		pContext->bIsReleased = TRUE;
	}
	else
	{
		::DeleteCriticalSection(&pContext->Lock);
		//::HeapFree(::GetProcessHeap(), 0, pContext);
		delete pContext;
	}
	::LeaveCriticalSection(&m_FreeContextListLock);


	
	EnterCriticalSection(&m_HeapLock);
	iContextCount--;
	LeaveCriticalSection(&m_HeapLock);	
}


void CIOCPServer::FreeBuffers()
{
	// 遍歷m_pFreeBufferList空閒列表，釋放緩衝區池內存
	::EnterCriticalSection(&m_FreeBufferListLock);


	CIOCPBuffer *pFreeBuffer = m_pFreeBufferList;
	CIOCPBuffer *pNextBuffer;
	while(pFreeBuffer != NULL)
	{
		pNextBuffer = pFreeBuffer->pNext;


		delete pFreeBuffer;
// 		if(!::HeapFree(::GetProcessHeap(), 0, pFreeBuffer))
// 		{
// #ifdef _DEBUG
// 			::OutputDebugString("  FreeBuffers釋放內存出錯！");
// #endif // _DEBUG
// 			break;
// 		}
		pFreeBuffer = pNextBuffer;
	}
	m_pFreeBufferList = NULL;
	m_nFreeBufferCount = 0;


	::LeaveCriticalSection(&m_FreeBufferListLock);
}


void CIOCPServer::FreeContexts()
{
	// 遍歷m_pFreeContextList空閒列表，釋放緩衝區池內存
	::EnterCriticalSection(&m_FreeContextListLock);
	
	CIOCPContext *pFreeContext = m_pFreeContextList;
	CIOCPContext *pNextContext;
	while(pFreeContext != NULL)
	{
		pNextContext = pFreeContext->pNext;
		
		::DeleteCriticalSection(&pFreeContext->Lock);
		delete pFreeContext;
// 		if(!::HeapFree(::GetProcessHeap(), 0, pFreeContext))
// 		{
// #ifdef _DEBUG
// 			::OutputDebugString("  FreeBuffers釋放內存出錯！");
// #endif // _DEBUG
// 			break;
// 		}
		pFreeContext = pNextContext;
	}
	m_pFreeContextList = NULL;
	m_nFreeContextCount = 0;


	::LeaveCriticalSection(&m_FreeContextListLock);
}




BOOL CIOCPServer::AddAConnection(CIOCPContext *pContext)
{
	// 向客戶連接列表添加一個CIOCPContext對象


	::EnterCriticalSection(&m_ConnectionListLock);
	if(m_nCurrentConnection <= m_nMaxConnections)
	{
		// 添加到表頭
		pContext->pNext = m_pConnectionList;
		m_pConnectionList = pContext;
		// 更新計數
		m_nCurrentConnection ++;


		::LeaveCriticalSection(&m_ConnectionListLock);
		return TRUE;
	}
	::LeaveCriticalSection(&m_ConnectionListLock);


	return FALSE;
}


void CIOCPServer::CloseAConnection(CIOCPContext *pContext)
{
	if(pContext == NULL || pContext->bClosing == TRUE)
		return;


	// 首先從列表中移除要關閉的連接
	::EnterCriticalSection(&m_ConnectionListLock);


	CIOCPContext* pTest = m_pConnectionList;
	if(pTest == pContext)
	{
		m_pConnectionList =  pContext->pNext;
		m_nCurrentConnection --;
	}
	else
	{
		while(pTest != NULL && pTest->pNext !=  pContext)
			pTest = pTest->pNext;
		if(pTest != NULL)
		{
			pTest->pNext =  pContext->pNext;
			m_nCurrentConnection --;
		}
	}
	
	::LeaveCriticalSection(&m_ConnectionListLock);


	// 然後關閉客戶套節字
	::EnterCriticalSection(&pContext->Lock);


	if(pContext->s != INVALID_SOCKET)
	{
		::closesocket(pContext->s);	
		pContext->s = INVALID_SOCKET;
	}
	pContext->bClosing = TRUE;


	::LeaveCriticalSection(&pContext->Lock);
}


void CIOCPServer::CloseAllConnections()
{
	// 遍歷整個連接列表，關閉所有的客戶套節字


	::EnterCriticalSection(&m_ConnectionListLock);


	CIOCPContext *pContext = m_pConnectionList;
	while(pContext != NULL)
	{	
		::EnterCriticalSection(&pContext->Lock);


		if(pContext->s != INVALID_SOCKET)
		{
			::closesocket(pContext->s);
			pContext->s = INVALID_SOCKET;
		}


		pContext->bClosing = TRUE;


		::LeaveCriticalSection(&pContext->Lock);	
		
		pContext = pContext->pNext;
	}


	m_pConnectionList = NULL;
	m_nCurrentConnection = 0;


	::LeaveCriticalSection(&m_ConnectionListLock);
}




BOOL CIOCPServer::InsertPendingAccept(CIOCPBuffer *pBuffer)
{
	// 將一個I/O緩衝區對象插入到m_pPendingAccepts表中


	::EnterCriticalSection(&m_PendingAcceptsLock);


	if(m_pPendingAccepts == NULL)
		m_pPendingAccepts = pBuffer;
	else
	{
		pBuffer->pNext = m_pPendingAccepts;
		m_pPendingAccepts = pBuffer;
	}
	m_nPendingAcceptCount ++;


	::LeaveCriticalSection(&m_PendingAcceptsLock);


	return TRUE;
}


BOOL CIOCPServer::RemovePendingAccept(CIOCPBuffer *pBuffer)
{
	BOOL bResult = FALSE;


	// 遍歷m_pPendingAccepts表，從中移除pBuffer所指向的緩衝區對象
	::EnterCriticalSection(&m_PendingAcceptsLock);


	CIOCPBuffer *pTest = m_pPendingAccepts;
	if(pTest == pBuffer)	// 如果是表頭元素
	{
		m_pPendingAccepts = pBuffer->pNext;
		bResult = TRUE;
	}
	else					// 不是表頭元素的話，就要遍歷這個表來查找了
	{
		while(pTest != NULL && pTest->pNext != pBuffer)
			pTest = pTest->pNext;
		if(pTest != NULL)
		{
			pTest->pNext = pBuffer->pNext;
			 bResult = TRUE;
		}
	}
	// 更新計數
	if(bResult)
		m_nPendingAcceptCount --;


	::LeaveCriticalSection(&m_PendingAcceptsLock);


	return  bResult;
}


void CIOCPServer::ErrorHandle(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
	CloseAConnection(pContext);
}


BOOL CIOCPServer::PostSendToList(CIOCPContext *pContext, CIOCPBuffer *pBuffer)//xss
{
	::EnterCriticalSection(&pContext->Lock);
	CIOCPNextToSend *ptr = pContext->pNextToSend;


	CIOCPNextToSend * pSend = new CIOCPNextToSend();
	pSend->pBuffer = pBuffer;
	pSend->pNext = NULL;
	if(ptr == NULL)
	{
		printf("數據：%10.10s ...，被直接發送。\n",pBuffer->buff);
		//::EnterCriticalSection(&pContext->Lock);
		pContext->pNextToSend = pSend;
		//::LeaveCriticalSection(&pContext->Lock);
		if(!PostSend(pContext,pBuffer))//如果沒有需要等待的send就直接發送
		{
			::LeaveCriticalSection(&pContext->Lock);
			return FALSE;
		}
	}
	else
	{
		printf("數據：%10.10s ...，被放入鏈表結尾。\n",pBuffer->buff);
		while(ptr->pNext != NULL)
		{
			ptr = ptr->pNext;
		}
		ptr->pNext = pSend;//新的發送請求放在鏈表結尾
	}
	::LeaveCriticalSection(&pContext->Lock);
	return TRUE;
}


BOOL CIOCPServer::PostNextWriteBuffer(CIOCPContext *pContext, CIOCPBuffer *pBuffer)//xss
{
	::EnterCriticalSection(&pContext->Lock);
	CIOCPNextToSend* pSend = pContext->pNextToSend;
	CIOCPNextToSend* pNextSend = NULL;
	if(pSend != NULL && pSend->pNext != NULL)//發送成功的pBuffer是隊列的第一個，發送下一個，pNextToSend指向下一個，pBuffer由外面釋放。
	{
		pNextSend = pSend->pNext;
		if(pNextSend->pBuffer != NULL)
		{
			printf("數據：%10.10s ...從鏈表中彈出被髮送。\n",pNextSend->pBuffer->buff);
			if(!PostSend(pContext,pNextSend->pBuffer))
			{
				delete pSend;
				pContext->pNextToSend = pNextSend;
				::LeaveCriticalSection(&pContext->Lock);
				return FALSE;
			}
		}
	}
	if(pSend != NULL)
	{
		pNextSend = pSend->pNext;
		delete pSend;
		pContext->pNextToSend = pNextSend;
	}
	::LeaveCriticalSection(&pContext->Lock);
	return TRUE;
}


CIOCPBuffer *CIOCPServer::GetNextReadBuffer(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
	if(pBuffer != NULL)
	{
		// 如果與要讀的下一個序列號相等，則讀這塊緩衝區
		if(pBuffer->nSequenceNumber == pContext->nCurrentReadSequence)
		{
			return pBuffer;
		}
		
		// 如果不相等，則說明沒有按順序接收數據，將這塊緩衝區保存到連接的pOutOfOrderReads列表中


		// 列表中的緩衝區是按照其序列號從小到大的順序排列的


		pBuffer->pNext = NULL;
		
		CIOCPBuffer *ptr = pContext->pOutOfOrderReads;
		CIOCPBuffer *pPre = NULL;
		while(ptr != NULL)
		{
			if(pBuffer->nSequenceNumber < ptr->nSequenceNumber)
				break;
			
			pPre = ptr;
			ptr = ptr->pNext;
		}
		
		if(pPre == NULL) // 應該插入到表頭
		{
			pBuffer->pNext = pContext->pOutOfOrderReads;
			pContext->pOutOfOrderReads = pBuffer;
		}
		else			// 應該插入到表的中間
		{
			pBuffer->pNext = pPre->pNext;
			pPre->pNext = pBuffer/*->pNext*/;//xss,個人覺得應該是pPre->pNext = pBuffer;
		}
	}


	// 檢查表頭元素的序列號，如果與要讀的序列號一致，就將它從表中移除，返回給用戶
	CIOCPBuffer *ptr = pContext->pOutOfOrderReads;
	if(ptr != NULL && (ptr->nSequenceNumber == pContext->nCurrentReadSequence))
	{
		pContext->pOutOfOrderReads = ptr->pNext;
		return ptr;
	}
	return NULL;
}




BOOL CIOCPServer::PostAccept(CIOCPBuffer *pBuffer)	// 在監聽套節字上投遞Accept請求
{
		// 設置I/O類型
		pBuffer->nOperation = OP_ACCEPT;


		// 投遞此重疊I/O  
		DWORD dwBytes;
		pBuffer->sClient = ::WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);
		BOOL b = m_lpfnAcceptEx(m_sListen, 
			pBuffer->sClient,
			pBuffer->buff, 
			pBuffer->nLen - ((sizeof(sockaddr_in) + 16) * 2),//xss,第一次都是收一個cmd_header
			sizeof(sockaddr_in) + 16, 
			sizeof(sockaddr_in) + 16, 
			&dwBytes, 
			&pBuffer->ol);
		if(!b && ::WSAGetLastError() != WSA_IO_PENDING)
		{
			return FALSE;
		}
		if(pBuffer->nOperation == 0)
		{
			int x = 0;
		}
		return TRUE;
};


BOOL CIOCPServer::PostRecv(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
	// 設置I/O類型
	pBuffer->nOperation = OP_READ;	
	
	::EnterCriticalSection(&pContext->Lock);


	// 設置序列號
	pBuffer->nSequenceNumber = pContext->nReadSequence;


	// 投遞此重疊I/O
	DWORD dwBytes;
	DWORD dwFlags = 0;
	WSABUF buf;
	buf.buf = pBuffer->buff;
	buf.len = pBuffer->nLen;
	if(::WSARecv(pContext->s, &buf, 1, &dwBytes, &dwFlags, &pBuffer->ol, NULL) != NO_ERROR)
	{
		if(::WSAGetLastError() != WSA_IO_PENDING)
		{
			printf("WSARecv出錯：%d\n",WSAGetLastError());
			::LeaveCriticalSection(&pContext->Lock);
			return FALSE;
		}
	}


	// 增加套節字上的重疊I/O計數和讀序列號計數


	pContext->nOutstandingRecv ++;
	pContext->nReadSequence ++;


	::LeaveCriticalSection(&pContext->Lock);
	
	return TRUE;
}


BOOL CIOCPServer::PostSend(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{	
	// 跟蹤投遞的發送的數量，防止用戶僅發送數據而不接收，導致服務器拋出大量發送操作
	if(pContext->nOutstandingSend > m_nMaxSends)
		return FALSE;


	// 設置I/O類型，增加套節字上的重疊I/O計數
	pBuffer->nOperation = OP_WRITE;


	// 投遞此重疊I/O
	DWORD dwBytes;
	DWORD dwFlags = 0;
	WSABUF buf;
	buf.buf = pBuffer->buff;
	buf.len = pBuffer->nLen;
	if(::WSASend(pContext->s, 
			&buf, 1, &dwBytes, dwFlags, &pBuffer->ol, NULL) != NO_ERROR)
	{
		int x;
		if((x=::WSAGetLastError()) != WSA_IO_PENDING)
		{
			printf("發送失敗！錯誤碼：%d",x);
			return FALSE;
		}
	}	
	// 增加套節字上的重疊I/O計數


	::EnterCriticalSection(&pContext->Lock);
	pContext->nOutstandingSend ++;
	::LeaveCriticalSection(&pContext->Lock);


	if(pBuffer->nOperation == 0)
	{
		int x = 0;
	}
	return TRUE;
}




BOOL CIOCPServer::Start(int nPort, int nMaxConnections, 
			int nMaxFreeBuffers, int nMaxFreeContexts, int nInitialReads)
{
	// 檢查服務是否已經啓動
	if(m_bServerStarted)
		return FALSE;


	// 保存用戶參數
	m_nPort = nPort;
	m_nMaxConnections = nMaxConnections;
	m_nMaxFreeBuffers = nMaxFreeBuffers;
	m_nMaxFreeContexts = nMaxFreeContexts;
	m_nInitialReads = nInitialReads;


	// 初始化狀態變量
	m_bShutDown = FALSE;
	m_bServerStarted = TRUE;




	// 創建監聽套節字，綁定到本地端口，進入監聽模式
	m_sListen = ::WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);
	SOCKADDR_IN si;
	si.sin_family = AF_INET;
	si.sin_port = ::ntohs(m_nPort);
	si.sin_addr.S_un.S_addr = INADDR_ANY;
	if(::bind(m_sListen, (sockaddr*)&si, sizeof(si)) == SOCKET_ERROR)
	{
		m_bServerStarted = FALSE;
		return FALSE;
	}
	::listen(m_sListen, 200);


	// 創建完成端口對象
	m_hCompletion = ::CreateIoCompletionPort(INVALID_HANDLE_VALUE, 0, 0, 0);


	// 加載擴展函數AcceptEx
	GUID GuidAcceptEx = WSAID_ACCEPTEX;
	DWORD dwBytes;
	::WSAIoctl(m_sListen, 
		SIO_GET_EXTENSION_FUNCTION_POINTER, 
		&GuidAcceptEx, 
		sizeof(GuidAcceptEx),
		&m_lpfnAcceptEx, 
		sizeof(m_lpfnAcceptEx), 
		&dwBytes, 
		NULL, 
		NULL);
	
	// 加載擴展函數GetAcceptExSockaddrs
	GUID GuidGetAcceptExSockaddrs = WSAID_GETACCEPTEXSOCKADDRS;
	::WSAIoctl(m_sListen,
		SIO_GET_EXTENSION_FUNCTION_POINTER,
		&GuidGetAcceptExSockaddrs,
		sizeof(GuidGetAcceptExSockaddrs),
		&m_lpfnGetAcceptExSockaddrs,
		sizeof(m_lpfnGetAcceptExSockaddrs),
		&dwBytes,
		NULL,
		NULL
		);
	
	
	// 將監聽套節字關聯到完成端口，注意，這裏爲它傳遞的CompletionKey爲0
	::CreateIoCompletionPort((HANDLE)m_sListen, m_hCompletion, (DWORD)0, 0);


	// 註冊FD_ACCEPT事件。
	// 如果投遞的AcceptEx I/O不夠，線程會接收到FD_ACCEPT網絡事件，說明應該投遞更多的AcceptEx I/O
	WSAEventSelect(m_sListen, m_hAcceptEvent, FD_ACCEPT);


	// 創建監聽線程
	m_hListenThread = ::CreateThread(NULL, 0, _ListenThreadProc, this, 0, NULL);
	
	return TRUE;
}


void CIOCPServer::Shutdown()
{
	if(!m_bServerStarted)
		return;


	// 通知監聽線程，馬上停止服務
	m_bShutDown = TRUE;
	::SetEvent(m_hAcceptEvent);
	// 等待監聽線程退出
	::WaitForSingleObject(m_hListenThread, INFINITE);
	::CloseHandle(m_hListenThread);
	m_hListenThread = NULL;


	m_bServerStarted = FALSE;
}


DWORD WINAPI CIOCPServer::_ListenThreadProc(LPVOID lpParam)
{
	CIOCPServer *pThis = (CIOCPServer*)lpParam;


	// 先在監聽套節字上投遞幾個Accept I/O
	CIOCPBuffer *pBuffer;
	for(int i=0; i<pThis->m_nInitialAccepts; i++)
	{
		pBuffer = pThis->AllocateBuffer(BUFFER_SIZE);//xss,BUFFER_SIZE
		if(pBuffer == NULL)
			return -1;
		pThis->InsertPendingAccept(pBuffer);
		pThis->PostAccept(pBuffer);
	}


	// 構建事件對象數組，以便在上面調用WSAWaitForMultipleEvents函數
	HANDLE hWaitEvents[2 + MAX_THREAD];
	int nEventCount = 0;
	hWaitEvents[nEventCount ++] = pThis->m_hAcceptEvent;
	hWaitEvents[nEventCount ++] = pThis->m_hRepostEvent;


	// 創建指定數量的工作線程在完成端口上處理I/O
	for(int i=0; i<MAX_THREAD; i++)
	{
		hWaitEvents[nEventCount ++] = ::CreateThread(NULL, 0, _WorkerThreadProc, pThis, 0, NULL);
	}


	// 下面進入無限循環，處理事件對象數組中的事件
	while(TRUE)
	{
		int nIndex = ::WSAWaitForMultipleEvents(nEventCount, hWaitEvents, FALSE, 60*1000, FALSE);
	
		// 首先檢查是否要停止服務
		if(pThis->m_bShutDown || nIndex == WSA_WAIT_FAILED)
		{
			// 關閉所有連接
			pThis->CloseAllConnections();
			::Sleep(0);		// 給I/O工作線程一個執行的機會
			// 關閉監聽套節字
			::closesocket(pThis->m_sListen);
			pThis->m_sListen = INVALID_SOCKET;
			::Sleep(0);		// 給I/O工作線程一個執行的機會


			// 通知所有I/O處理線程退出
			for(int i=2; i<MAX_THREAD + 2; i++)
			{	
				::PostQueuedCompletionStatus(pThis->m_hCompletion, -1, 0, NULL);
			}


			// 等待I/O處理線程退出
			::WaitForMultipleObjects(MAX_THREAD, &hWaitEvents[2], TRUE, 5*1000);


			for(int i=2; i<MAX_THREAD + 2; i++)
			{	
				::CloseHandle(hWaitEvents[i]);
			}
		
			::CloseHandle(pThis->m_hCompletion);


			pThis->FreeBuffers();
			pThis->FreeContexts();
			::ExitThread(0);
		}	


		// 1）定時檢查所有未返回的AcceptEx I/O的連接建立了多長時間
		if(nIndex == WSA_WAIT_TIMEOUT)
		{
			pBuffer = pThis->m_pPendingAccepts;
			while(pBuffer != NULL)
			{
				int nSeconds;
				int nLen = sizeof(nSeconds);
				// 取得連接建立的時間
				::getsockopt(pBuffer->sClient, 
					SOL_SOCKET, SO_CONNECT_TIME, (char *)&nSeconds, &nLen);	
				// 如果超過2分鐘客戶還不發送初始數據，就讓這個客戶go away
				if(nSeconds != -1 && nSeconds > /*2*60*/50)
				{   
					closesocket(pBuffer->sClient);
                    pBuffer->sClient = INVALID_SOCKET;
				}


				pBuffer = pBuffer->pNext;
			}
		}
		else
		{
			nIndex = nIndex - WAIT_OBJECT_0;
			WSANETWORKEVENTS ne;
            int nLimit=0;
			if(nIndex == 0)			// 2）m_hAcceptEvent事件對象受信，說明投遞的Accept請求不夠，需要增加
			{
				::WSAEnumNetworkEvents(pThis->m_sListen, hWaitEvents[nIndex], &ne);
				if(ne.lNetworkEvents & FD_ACCEPT)
				{
					nLimit = 50;  // 增加的個數，這裏設爲50個
				}
			}
			else if(nIndex == 1)	// 3）m_hRepostEvent事件對象受信，說明處理I/O的線程接受到新的客戶
			{
				nLimit = InterlockedExchange(&pThis->m_nRepostCount, 0);
			}
			else if(nIndex > 1)		// I/O服務線程退出，說明有錯誤發生，關閉服務器
			{
				pThis->m_bShutDown = TRUE;
				continue;
			}


			// 投遞nLimit個AcceptEx I/O請求
			int i = 0;
			while(i++ < nLimit && pThis->m_nPendingAcceptCount < pThis->m_nMaxAccepts)
			{
				pBuffer = pThis->AllocateBuffer(BUFFER_SIZE);
				if(pBuffer != NULL)
				{
					pThis->InsertPendingAccept(pBuffer);
					pThis->PostAccept(pBuffer);
				}
			}
		}
	}
	return 0;
}


DWORD WINAPI CIOCPServer::_WorkerThreadProc(LPVOID lpParam)
{
#ifdef _DEBUG
			::OutputDebugString("	WorkerThread 啓動... \n");
#endif // _DEBUG


	CIOCPServer *pThis = (CIOCPServer*)lpParam;


	CIOCPBuffer *pBuffer = NULL;
	DWORD dwKey;
	DWORD dwTrans;
	LPOVERLAPPED lpol;


	while(TRUE)
	{
		// 在關聯到此完成端口的所有套節字上等待I/O完成
		BOOL bOK = ::GetQueuedCompletionStatus(pThis->m_hCompletion, 
					&dwTrans, (LPDWORD)&dwKey, (LPOVERLAPPED*)&lpol, WSA_INFINITE);
		
		if(dwTrans == -1) // 用戶通知退出
		{
#ifdef _DEBUG
			::OutputDebugString("	WorkerThread 退出 \n");
#endif // _DEBUG
			::ExitThread(0);
		}
		if(dwTrans != -2)
			pBuffer = CONTAINING_RECORD(lpol, CIOCPBuffer, ol);
		int nError = NO_ERROR;
		if(!bOK)						// 在此套節字上有錯誤發生
		{
			printf("完成端口套接字上有錯誤：%d\n",GetLastError());
			SOCKET s;
			if(pBuffer->nOperation == OP_ACCEPT)
			{
				s = pThis->m_sListen;
			}
			else
			{
				if(dwKey == 0)
					break;
				s = ((CIOCPContext*)dwKey)->s;
			}
			DWORD dwFlags = 0;
			if(!::WSAGetOverlappedResult(s, &pBuffer->ol, &dwTrans, FALSE, &dwFlags))
			{
				nError = ::WSAGetLastError();
			}
		}
		pThis->HandleIO(dwKey, pBuffer, dwTrans, nError);
		printf("Buffer:%d     Context:%d\n",iBufferCount,iContextCount);
	}


#ifdef _DEBUG
			::OutputDebugString("	WorkerThread 退出 \n");
#endif // _DEBUG
	return 0;
}


int g_x = 0;
void CIOCPServer::HandleIO(DWORD dwKey, CIOCPBuffer *pBuffer, DWORD dwTrans, int nError)
{
	CIOCPContext *pContext = (CIOCPContext *)dwKey;


#ifdef _DEBUG
			::OutputDebugString("	HandleIO... \n");
#endif // _DEBUG
	
	// 1）首先減少套節字上的未決I/O計數
	if(dwTrans == -2)
	{
		CloseAConnection(pContext);
		return;
	}
	if(pContext != NULL)
	{
		::EnterCriticalSection(&pContext->Lock);
		
		if(pBuffer->nOperation == OP_READ)
			pContext->nOutstandingRecv --;
		else if(pBuffer->nOperation == OP_WRITE)
			pContext->nOutstandingSend --;
		
		::LeaveCriticalSection(&pContext->Lock);
		
		// 2）檢查套節字是否已經被我們關閉
		if(pContext->bClosing) 
		{
#ifdef _DEBUG
			::OutputDebugString("	檢查到套節字已經被我們關閉 \n");
#endif // _DEBUG
			if(pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
			{		
				ReleaseContext(pContext);
				pContext = NULL;
			}
			// 釋放已關閉套節字的未決I/O
			ReleaseBuffer(pBuffer);
			pBuffer = NULL;
			return;
		}
	}
	else
	{
		RemovePendingAccept(pBuffer);
	}


	// 3）檢查套節字上發生的錯誤，如果有的話，通知用戶，然後關閉套節字
	if(nError != NO_ERROR)
	{
		if(pBuffer->nOperation != OP_ACCEPT)
		{
			OnConnectionError(pContext, pBuffer, nError);
			CloseAConnection(pContext);
			if(pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
			{		
				ReleaseContext(pContext);
				pContext = NULL;
			}
#ifdef _DEBUG
			::OutputDebugString("	檢查到客戶套節字上發生錯誤 \n");
#endif // _DEBUG
		}
		else // 在監聽套節字上發生錯誤，也就是監聽套節字處理的客戶出錯了
		{
			// 客戶端出錯，釋放I/O緩衝區
			if(pBuffer->sClient != INVALID_SOCKET)
			{
				::closesocket(pBuffer->sClient);
				pBuffer->sClient = INVALID_SOCKET;
			}
#ifdef _DEBUG
			::OutputDebugString("	檢查到監聽套節字上發生錯誤 \n");
#endif // _DEBUG
		}


		ReleaseBuffer(pBuffer);
		pBuffer = NULL;
		return;
	}




	// 開始處理
	if(pBuffer->nOperation == OP_ACCEPT)
	{
		if(dwTrans == 0)
		{
#ifdef _DEBUG
			::OutputDebugString("	監聽套節字上客戶端關閉 \n");
#endif // _DEBUG
			
			if(pBuffer->sClient != INVALID_SOCKET)
			{
				::closesocket(pBuffer->sClient);
				pBuffer->sClient = INVALID_SOCKET;
			}
		}
		else
		{
			// 爲新接受的連接申請客戶上下文對象
			CIOCPContext *pClient = AllocateContext(pBuffer->sClient);
			if(pClient != NULL)
			{
				if(AddAConnection(pClient))
				{	
					// 取得客戶地址
					int nLocalLen, nRmoteLen;
					LPSOCKADDR pLocalAddr, pRemoteAddr;
					m_lpfnGetAcceptExSockaddrs(
						pBuffer->buff,
						pBuffer->nLen - (sizeof(sockaddr_in) + 16) * 2/*sizeof(cmd_header)*/,
						sizeof(sockaddr_in) + 16,
						sizeof(sockaddr_in) + 16,
						(SOCKADDR **)&pLocalAddr,
						&nLocalLen,
						(SOCKADDR **)&pRemoteAddr,
						&nRmoteLen);
					memcpy(&pClient->addrLocal, pLocalAddr, nLocalLen);
					memcpy(&pClient->addrRemote, pRemoteAddr, nRmoteLen);
					
					// 關聯新連接到完成端口對象
					::CreateIoCompletionPort((HANDLE)pClient->s, m_hCompletion, (DWORD)pClient, 0);
					
					// 通知用戶
					pBuffer->nLen = dwTrans;
					OnConnectionEstablished(pClient, pBuffer);


					if(pClient->bClosing && pClient->nOutstandingRecv == 0 && pClient->nOutstandingSend == 0)
					{
						ReleaseContext(pClient);
						pContext = NULL;
					}
					else if(pClient->hTimer == NULL)//接收一個客戶端的同時創建一個檢測I/O超時的Timer
					{
						pClient->hCompletion = m_hCompletion;
						CreateTimerQueueTimer(&pClient->hTimer,m_hTimerQueue,(WAITORTIMERCALLBACK)TimerRoutine,(PVOID)pClient,60*1000,0,0);
					}
					
					// 向新連接投遞Read請求或者Write請求，直接關閉這些空間在套節字關閉或出錯時釋放
// 						CIOCPBuffer *p = AllocateBuffer(BUFFER_SIZE);
// 						if(p != NULL)
// 						{
// 							if(!PostRecv(pClient, p))
// 							{
// 								CloseAConnection(pClient);
// 							}
// 						}


				}
				else	// 連接數量已滿，關閉連接
				{
					CloseAConnection(pClient);
					ReleaseContext(pClient);
					pContext = NULL;
				}
			}
			else
			{
				// 資源不足，關閉與客戶的連接即可
				::closesocket(pBuffer->sClient);
				pBuffer->sClient = INVALID_SOCKET;
			}
		}
		
		// Accept請求完成，釋放I/O緩衝區
		ReleaseBuffer(pBuffer);
		pBuffer = NULL;


		// 通知監聽線程繼續再投遞一個Accept請求
		::InterlockedIncrement(&m_nRepostCount);


		::SetEvent(m_hRepostEvent);
	}
	else if(pBuffer->nOperation == OP_READ)
	{
		if(dwTrans == 0)	// 對方關閉套節字
		{
			// 先通知用戶
			pBuffer->nLen = 0;
			OnConnectionClosing(pContext, pBuffer);	
			// 再關閉連接
			CloseAConnection(pContext);
			// 釋放客戶上下文和緩衝區對象
			if(pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
			{		
				ReleaseContext(pContext);
				pContext = NULL;
			}
			ReleaseBuffer(pBuffer);
			pBuffer = NULL;
		}
		else
		{
			pBuffer->nLen = dwTrans;
			// 按照I/O投遞的順序讀取接收到的數據
			CIOCPBuffer *p = GetNextReadBuffer(pContext, pBuffer);
			while(p != NULL)
			{
				// 通知用戶
				OnReadCompleted(pContext, p);
				// 增加要讀的序列號的值
				::InterlockedIncrement((LONG*)&pContext->nCurrentReadSequence);
				// 釋放這個已完成的I/O
				ReleaseBuffer(p);
				p = GetNextReadBuffer(pContext, NULL);
			}


			if(pContext->bClosing && pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
			{
				ReleaseContext(pContext);
				pContext = NULL;
			}
			else if(pContext->hTimer != NULL)
			{			
				ChangeTimerQueueTimer(m_hTimerQueue,pContext->hTimer,60*1000,0);//重置監視時間，當一個投遞完成後，60s內無任何交互則斷開。
			}


			// 繼續投遞一個新的接收請求
		 //   pBuffer = AllocateBuffer(BUFFER_SIZE);
			//if(pBuffer == NULL || !PostRecv(pContext, pBuffer))
			//{
			//	CloseAConnection(pContext);
			//}
		}
	}
	else if(pBuffer->nOperation == OP_WRITE)
	{


		if(dwTrans == 0)	// 對方關閉套節字
		{
			// 先通知用戶
			pBuffer->nLen = 0;
			OnConnectionClosing(pContext, pBuffer);	


			// 再關閉連接
			CloseAConnection(pContext);


			// 釋放客戶上下文和緩衝區對象
			if(pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
			{		
				ReleaseContext(pContext);
				pContext = NULL;
			}
			ReleaseBuffer(pBuffer);
			pBuffer = NULL;
		}
		else
		{
			if(pContext->bClosing && pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
			{
				ReleaseContext(pContext);
				pContext = NULL;
				ReleaseBuffer(pBuffer);
				pBuffer = NULL;
				return;
			}
			else if(pContext->hTimer != NULL)
			{			
				ChangeTimerQueueTimer(m_hTimerQueue,pContext->hTimer,60*1000,0);
			}


			// 寫操作完成，通知用戶
			if(dwTrans < pBuffer->nLen)//如果此send沒有發送完全，則發送剩下的部分（此部分如果還是沒發完全，這裏同樣進行）
			{
				printf("send未發送完全，發送：%d，總長度：%d\n",dwTrans,pBuffer->nLen);
				CIOCPBuffer* p = AllocateBuffer(pBuffer->nLen - dwTrans);
				if(p != NULL)
					memcpy(p->buff,pBuffer->buff + dwTrans,pBuffer->nLen - dwTrans);
				if(p == NULL || !PostSend(pContext,p))
				{
					CloseAConnection(pContext);
					return;
				}
			}
			else
			{
				if(!PostNextWriteBuffer(pContext,pBuffer))
				{
					CloseAConnection(pContext);
					return;
				}
			}
			pBuffer->nLen = dwTrans;
			OnWriteCompleted(pContext, pBuffer);
			if(pContext->bClosing && pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0)
			{
				ReleaseContext(pContext);
				pContext = NULL;
			}
			// 釋放SendText函數申請的緩衝區
			ReleaseBuffer(pBuffer);
			pBuffer = NULL;
		}
	}
}




BOOL CIOCPServer::SendText(CIOCPContext *pContext, char *pszText, int nLen)
{
	CIOCPBuffer *pBuffer = AllocateBuffer(nLen);
	if(pBuffer != NULL)
	{
		memcpy(pBuffer->buff, pszText, nLen);
		return PostSend(pContext, pBuffer);
	}
	return FALSE;
}


//投遞接收請求示例
//CIOCPBuffer *p = AllocateBuffer(BUFFER_SIZE);
//if(p != NULL)
//{
//	if(!PostRecv(pContext, p))
//	{
//		CloseAConnection(pContext);
//	}
//}
//投遞發送請求示例
//CIOCPBuffer *p = AllocateBuffer(BUFFER_SIZE);
//if(p != NULL)
//{
//	if(!PostSendToList(pContext, p))
//	{
//		CloseAConnection(pContext);
//	}
//}
void CIOCPServer::OnConnectionEstablished(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
	//連接建立，且第一次數據接收完成。
	//接下來可以根據業務邏輯，PostRecv收或者PostSendToList發或者CloseAConnection(pContext)關閉連接
}


void CIOCPServer::OnConnectionClosing(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
}


void CIOCPServer::OnReadCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
	//一次數據接收完成。
	//接下來可以根據業務邏輯，PostRecv收或者PostSendToList發或者CloseAConnection(pContext)關閉連接
}


void CIOCPServer::OnWriteCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer)
{
	//一次數據發送完成。
	//接下來可以根據業務邏輯，PostRecv收或者PostSendToList發或者CloseAConnection(pContext)關閉連接
}


void CIOCPServer::OnConnectionError(CIOCPContext *pContext, CIOCPBuffer *pBuffer, int nError)
{
}

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