7种网络编程I/O模型代码实现实例
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转载自：http://blog.csdn.net/woshinia/article/details/8585930#
部分代码参考《[WINDOWS网络与通信程序设计].王艳平》，网络中一些I/O模型的代码都没有对socket是否可写做过深入研究，我这边会提供一些解决方法。
阻塞模式下，send会发生阻塞（非阻塞模式下send返回WSAEWOULDBLOCK错误，重叠I/O下表现为投递的发送请求一直无法完成）的情况一般可以分为3种 :
- 服务器虽然发送了大量数据，但客户端并未调用recv函数去接。
- 网络状况不佳，发送缓冲区中的数据一直发不出去。
- 发送数据量很大，如下载功能，协议发送数据的速度比不上send函数将数据拷贝到发送缓冲区的速度。
对于1,2情况，我们似乎可以直接关闭套接字，让客户端重新请求。但对于3，却不行。而且实际操作过程中，我们无法区分是1,2,还是3，我们能做的是尽量去保证发送的正确性。当然防止1情况或者2情况中长时间网络不畅，可以设定超时。若socket一直处于不可写状态超过1分钟，那么就关闭套接字。在最后的IOCP模型中就加入了这种超时机制。其他模型若要加入，可参考它来做。
一，基本的阻塞模型
#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失败！%d\n",WSAGetLastError()); Sleep(5000); break; } buf[len] = '\0'; printf("收到数据：%s\n",buf); } closesocket(*psClient); delete psClient; return 0;}int main(){ WSAData wsaData; if(0 != WSAStartup(MAKEWORD(2,2),&wsaData)) { printf("WSAStartup失败！\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失败！%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，无任何优化的非阻塞模型
#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("收到数据: %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
#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("初始化失败!%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)初始化一个套接字集合fdSocket，并将监听套接字放入 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）将fdSocket的一个拷贝fdRead传给select函数 fd_set fdRead = fdSocket; fd_set fdTmp = fdWrite; int nRetAll = 0; if(fdTmp.fd_count > 0) nRetAll = select(0,&fdRead,&fdTmp,NULL,NULL/*&time*/);//若不设置超时则select为阻塞 else nRetAll = select(0,&fdRead,NULL,NULL,NULL/*&time*/); if(nRetAll > 0) { //3）通过将原来的fdSocket和被select处理过的fdRead进行比较，决定由哪些socket有数据可以读取 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("接收到连接：(%s)\n",inet_ntoa(addrRemote.sin_addr)); } else { printf("连接数量已达上限！\n"); continue; } } else { int nRecv = recv(fdSocket.fd_array[i],buf,4096,0); if(nRecv > 0) { buf[nRecv] = 0; printf("收到数据：%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("发送了%d\n",nRet); } else { printf("1个Client已断开\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("发送了%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("============================================发送了%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，异步选择模型
注意：收到FD_Write消息有2种情况：1，在socket第一次和窗口句柄绑定后。2，socket从不可写状态变成可写状态。下面的事件选择模型也是同理。
#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("消息错误！\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("收到数据：%s\n",buf); int x = send(s,buf,nRet,0); printf("已发送字节数：%d , 线程号：%d\n",x,GetCurrentThreadId()); if(x < 0) { int iError = GetLastError(); printf("数据:%s ,错误：%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个Client已经断开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个Client已经断开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("窗口已关闭！\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错误！%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,"创建窗口错误！%d",GetLastError()); MessageBox(NULL,error,"error",MB_OK); return -1; } WSAData wsaData; if(0 != WSAStartup(MAKEWORD(2,2),&wsaData)) { printf("初始化失败!%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，事件选择模型
事件选择模型主要难点是对线程池的使用，send操作可以参考异步选择模型。
#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]);//通知线程，有新的事件加入了，需要重新调用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("接收到数据:%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("初始化失败!%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，重叠I/O模型
若需要建线程池，可参考事件选择模型。若纠结于send，可参考下面的IOCP。
#include <WinSock2.h>#include <Windows.h>#include <MSWSock.h>#include <stdio.h>#pragma comment(lib,"Ws2_32.lib")#define BUFFER_SIZE 4096typedef 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收到数据：%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收到数据：%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("发送数据: %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("初始化失败!%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
大框架为书中例子，对强化了发送操作，部分异常处理，且加入了连接超时处理。
注意：当一个投递完成，且对应socket上已经没有未决的投递，必须要再投递一个请求或者关闭连接，否则socket对应的数据结构无法被释放，对应socket连接断开时也无法被检测到。所以如果业务逻辑结束，要关闭连接。或者你需要等客户端来断开连接，那么你可以在业务逻辑结束后，再投递一个接收请求（客户端断开时，接收请求返回且接收的字节数为0，则此类中的异常处理逻辑便会将资源清理掉）。
头文件：
////////////////////////////////////////// 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请求的缓冲区大小#define MAX_THREAD 1 // I/O服务线程的数量// 这是per-I/O数据。它包含了在套节字上处理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接收的客户方套节字 char buff[BUFFER_SIZE]; // I/O操作使用的缓冲区 int nLen; // buff缓冲区（使用的）大小 ULONG nSequenceNumber; // 此I/O的序列号 BOOL bIsReleased; int nOperation; // 操作类型#define OP_ACCEPT 1#define OP_WRITE 2#define OP_READ 3 CIOCPBuffer *pNext;};struct CIOCPNextToSend;struct CIOCPTimerData;// 这是per-Handle数据。它包含了一个套节字的信息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; // 套节字句柄 SOCKADDR_IN addrLocal; // 连接的本地地址 SOCKADDR_IN addrRemote; // 连接的远程地址 BOOL bClosing; // 套节字是否关闭 int nOutstandingRecv; // 此套节字上抛出的重叠操作的数量 int nOutstandingSend; ULONG nReadSequence; // 安排给接收的下一个序列号 ULONG nCurrentReadSequence; // 当前要读的序列号 CIOCPBuffer *pOutOfOrderReads; // 记录没有按顺序完成的读I/O CIOCPNextToSend *pNextToSend; //xss,按顺序发送的下一个要发送的。 LPVOID pPreData; //xss，用于2个过程之间的数据交流。 ULONG nCurrentStep;//xss,用于记录当前处于的过程步骤数。 BOOL bIsReleased; CRITICAL_SECTION Lock; // 保护这个结构 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 // 处理线程{public: CIOCPServer(); ~CIOCPServer(); // 开始服务 BOOL Start(int nPort = 3456, int nMaxConnections = 2000, int nMaxFreeBuffers = 200, int nMaxFreeContexts = 100, int nInitialReads = 4); // 停止服务 void Shutdown(); // 关闭一个连接和关闭所有连接 void CloseAConnection(CIOCPContext *pContext); void CloseAllConnections(); // 取得当前的连接数量 ULONG GetCurrentConnection() { return m_nCurrentConnection; } // 向指定客户发送文本 BOOL SendText(CIOCPContext *pContext, char *pszText, int nLen); protected: // 申请和释放缓冲区对象 CIOCPBuffer *AllocateBuffer(int nLen); void ReleaseBuffer(CIOCPBuffer *pBuffer); // 申请和释放套节字上下文 CIOCPContext *AllocateContext(SOCKET s); void ReleaseContext(CIOCPContext *pContext); // 释放空闲缓冲区对象列表和空闲上下文对象列表 void FreeBuffers(); void FreeContexts(); // 向连接列表中添加一个连接 BOOL AddAConnection(CIOCPContext *pContext); // 插入和移除未决的接受请求 BOOL InsertPendingAccept(CIOCPBuffer *pBuffer); BOOL RemovePendingAccept(CIOCPBuffer *pBuffer); //xss,把要发送的数据加入队列，按顺序发送 BOOL PostSendToList(CIOCPContext *pContext, CIOCPBuffer *pBuffer); //xss,发送下一个需要发送的 BOOL PostNextWriteBuffer(CIOCPContext *pContext, CIOCPBuffer *pBuffer); // 取得下一个要读取的 CIOCPBuffer *GetNextReadBuffer(CIOCPContext *pContext, CIOCPBuffer *pBuffer); void ErrorHandle(CIOCPContext *pContext, CIOCPBuffer *pBuffer);//xss,错误集中处理 // 投递接受I/O、发送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); // 事件通知函数 // 建立了一个新的连接 virtual void OnConnectionEstablished(CIOCPContext *pContext, CIOCPBuffer *pBuffer); // 一个连接关闭 virtual void OnConnectionClosing(CIOCPContext *pContext, CIOCPBuffer *pBuffer); // 在一个连接上发生了错误 virtual void OnConnectionError(CIOCPContext *pContext, CIOCPBuffer *pBuffer, int nError); // 一个连接上的读操作完成 virtual void OnReadCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer); // 一个连接上的写操作完成 virtual void OnWriteCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer);protected: // 记录空闲结构信息 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; // 记录抛出的Accept请求 CIOCPBuffer *m_pPendingAccepts; // 抛出请求列表。 long m_nPendingAcceptCount; CRITICAL_SECTION m_PendingAcceptsLock; // 记录连接列表 CIOCPContext *m_pConnectionList; int m_nCurrentConnection; CRITICAL_SECTION m_ConnectionListLock; // 用于投递Accept请求 HANDLE m_hAcceptEvent; HANDLE m_hRepostEvent; LONG m_nRepostCount; int m_nPort; // 服务器监听的端口 int m_nInitialAccepts; int m_nInitialReads; int m_nMaxAccepts; int m_nMaxSends; int m_nMaxFreeBuffers; int m_nMaxFreeContexts; int m_nMaxConnections; HANDLE m_hListenThread; // 监听线程 HANDLE m_hCompletion; // 完成端口句柄 SOCKET m_sListen; // 监听套节字句柄 LPFN_ACCEPTEX m_lpfnAcceptEx; // AcceptEx函数地址 LPFN_GETACCEPTEXSOCKADDRS m_lpfnGetAcceptExSockaddrs; // GetAcceptExSockaddrs函数地址 BOOL m_bShutDown; // 用于通知监听线程退出 BOOL m_bServerStarted; // 记录服务是否启动 HANDLE m_hTimerQueue;//xss private: // 线程函数 static DWORD WINAPI _ListenThreadProc(LPVOID lpParam); static DWORD WINAPI _WorkerThreadProc(LPVOID lpParam);};#endif // __IOCP_H__cpp文件：
//////////////////////////////////////////////////// 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请求 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); }}///////////////////////////////////// 自定义帮助函数CIOCPBuffer *CIOCPServer::AllocateBuffer(int nLen){ CIOCPBuffer *pBuffer = NULL; if(nLen > BUFFER_SIZE) return NULL; // 为缓冲区对象申请内存 ::EnterCriticalSection(&m_FreeBufferListLock); if(m_pFreeBufferList == NULL) // 内存池为空，申请新的内存 {// pBuffer = (CIOCPBuffer *)::HeapAlloc(GetProcessHeap(), // HEAP_ZERO_MEMORY, sizeof(CIOCPBuffer) + BUFFER_SIZE); pBuffer = new CIOCPBuffer(); } else // 从内存池中取一块来使用 { pBuffer = m_pFreeBufferList; m_pFreeBufferList = m_pFreeBufferList->pNext; pBuffer->pNext = NULL; m_nFreeBufferCount --; } ::LeaveCriticalSection(&m_FreeBufferListLock); EnterCriticalSection(&m_HeapLock); iBufferCount++; LeaveCriticalSection(&m_HeapLock); // 初始化新的缓冲区对象 if(pBuffer != NULL) { //pBuffer->buff = (char*)(pBuffer + sizeof(CIOCPBuffer)/*1*/);//xss,个人以为应该+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) // 将要释放的内存添加到空闲列表中 { memset(pBuffer, 0, sizeof(CIOCPBuffer) /*+ BUFFER_SIZE*/); pBuffer->pNext = m_pFreeBufferList; m_pFreeBufferList = pBuffer; m_nFreeBufferCount ++ ; pBuffer->bIsReleased = TRUE; } else // 已经达到最大值，真正的释放内存 { //::HeapFree(::GetProcessHeap(), 0, pBuffer); delete pBuffer; } ::LeaveCriticalSection(&m_FreeBufferListLock); EnterCriticalSection(&m_HeapLock); iBufferCount--; LeaveCriticalSection(&m_HeapLock);}CIOCPContext *CIOCPServer::AllocateContext(SOCKET s){ CIOCPContext *pContext; // 申请一个CIOCPContext对象 ::EnterCriticalSection(&m_FreeContextListLock); if(m_pFreeContextList == NULL) { //pContext = (CIOCPContext *)::HeapAlloc(::GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(CIOCPContext)); pContext = new CIOCPContext(); ::InitializeCriticalSection(&pContext->Lock); } else { // 在空闲列表中申请 pContext = m_pFreeContextList; m_pFreeContextList = m_pFreeContextList->pNext; pContext->pNext = NULL; m_nFreeBufferCount --; } ::LeaveCriticalSection(&m_FreeContextListLock); EnterCriticalSection(&m_HeapLock); iContextCount++; LeaveCriticalSection(&m_HeapLock); // 初始化对象成员 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释放了Context\n\n",pContext->szClientName); if(pContext->s != INVALID_SOCKET) ::closesocket(pContext->s); // 首先释放（如果有的话）此套节字上的没有按顺序完成的读I/O的缓冲区 CIOCPBuffer *pNext; while(pContext->pOutOfOrderReads != NULL) { pNext = pContext->pOutOfOrderReads->pNext; ReleaseBuffer(pContext->pOutOfOrderReads); pContext->pOutOfOrderReads = pNext; } //xss,再释放（如果有的话）此套接字上未完成的写I/O缓冲区 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) // 添加到空闲列表 { // 先将关键代码段变量保存到一个临时变量中 CRITICAL_SECTION cstmp = pContext->Lock; // 将要释放的上下文对象初始化为0 memset(pContext, 0, sizeof(CIOCPContext)); // 再放会关键代码段变量，将要释放的上下文对象添加到空闲列表的表头 pContext->Lock = cstmp; pContext->pNext = m_pFreeContextList; m_pFreeContextList = pContext; // 更新计数 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(){ // 遍历m_pFreeBufferList空闲列表，释放缓冲区池内存 ::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释放内存出错！");// #endif // _DEBUG// break;// } pFreeBuffer = pNextBuffer; } m_pFreeBufferList = NULL; m_nFreeBufferCount = 0; ::LeaveCriticalSection(&m_FreeBufferListLock);}void CIOCPServer::FreeContexts(){ // 遍历m_pFreeContextList空闲列表，释放缓冲区池内存 ::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释放内存出错！");// #endif // _DEBUG// break;// } pFreeContext = pNextContext; } m_pFreeContextList = NULL; m_nFreeContextCount = 0; ::LeaveCriticalSection(&m_FreeContextListLock);}BOOL CIOCPServer::AddAConnection(CIOCPContext *pContext){ // 向客户连接列表添加一个CIOCPContext对象 ::EnterCriticalSection(&m_ConnectionListLock); if(m_nCurrentConnection <= m_nMaxConnections) { // 添加到表头 pContext->pNext = m_pConnectionList; m_pConnectionList = pContext; // 更新计数 m_nCurrentConnection ++; ::LeaveCriticalSection(&m_ConnectionListLock); return TRUE; } ::LeaveCriticalSection(&m_ConnectionListLock); return FALSE;}void CIOCPServer::CloseAConnection(CIOCPContext *pContext){ if(pContext == NULL || pContext->bClosing == TRUE) return; // 首先从列表中移除要关闭的连接 ::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); // 然后关闭客户套节字 ::EnterCriticalSection(&pContext->Lock); if(pContext->s != INVALID_SOCKET) { ::closesocket(pContext->s); pContext->s = INVALID_SOCKET; } pContext->bClosing = TRUE; ::LeaveCriticalSection(&pContext->Lock);}void CIOCPServer::CloseAllConnections(){ // 遍历整个连接列表，关闭所有的客户套节字 ::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){ // 将一个I/O缓冲区对象插入到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; // 遍历m_pPendingAccepts表，从中移除pBuffer所指向的缓冲区对象 ::EnterCriticalSection(&m_PendingAcceptsLock); CIOCPBuffer *pTest = m_pPendingAccepts; if(pTest == pBuffer) // 如果是表头元素 { m_pPendingAccepts = pBuffer->pNext; bResult = TRUE; } else // 不是表头元素的话，就要遍历这个表来查找了 { while(pTest != NULL && pTest->pNext != pBuffer) pTest = pTest->pNext; if(pTest != NULL) { pTest->pNext = pBuffer->pNext; bResult = TRUE; } } // 更新计数 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("数据：%10.10s ...，被直接发送。\n",pBuffer->buff); //::EnterCriticalSection(&pContext->Lock); pContext->pNextToSend = pSend; //::LeaveCriticalSection(&pContext->Lock); if(!PostSend(pContext,pBuffer))//如果没有需要等待的send就直接发送 { ::LeaveCriticalSection(&pContext->Lock); return FALSE; } } else { printf("数据：%10.10s ...，被放入链表结尾。\n",pBuffer->buff); while(ptr->pNext != NULL) { ptr = ptr->pNext; } ptr->pNext = pSend;//新的发送请求放在链表结尾 } ::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)//发送成功的pBuffer是队列的第一个，发送下一个，pNextToSend指向下一个，pBuffer由外面释放。 { pNextSend = pSend->pNext; if(pNextSend->pBuffer != NULL) { printf("数据：%10.10s ...从链表中弹出被发送。\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) { // 如果与要读的下一个序列号相等，则读这块缓冲区 if(pBuffer->nSequenceNumber == pContext->nCurrentReadSequence) { return pBuffer; } // 如果不相等，则说明没有按顺序接收数据，将这块缓冲区保存到连接的pOutOfOrderReads列表中 // 列表中的缓冲区是按照其序列号从小到大的顺序排列的 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) // 应该插入到表头 { pBuffer->pNext = pContext->pOutOfOrderReads; pContext->pOutOfOrderReads = pBuffer; } else // 应该插入到表的中间 { pBuffer->pNext = pPre->pNext; pPre->pNext = pBuffer/*->pNext*/;//xss,个人觉得应该是pPre->pNext = pBuffer; } } // 检查表头元素的序列号，如果与要读的序列号一致，就将它从表中移除，返回给用户 CIOCPBuffer *ptr = pContext->pOutOfOrderReads; if(ptr != NULL && (ptr->nSequenceNumber == pContext->nCurrentReadSequence)) { pContext->pOutOfOrderReads = ptr->pNext; return ptr; } return NULL;}BOOL CIOCPServer::PostAccept(CIOCPBuffer *pBuffer) // 在监听套节字上投递Accept请求{ // 设置I/O类型 pBuffer->nOperation = OP_ACCEPT; // 投递此重叠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,第一次都是收一个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){ // 设置I/O类型 pBuffer->nOperation = OP_READ; ::EnterCriticalSection(&pContext->Lock); // 设置序列号 pBuffer->nSequenceNumber = pContext->nReadSequence; // 投递此重叠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出错：%d\n",WSAGetLastError()); ::LeaveCriticalSection(&pContext->Lock); return FALSE; } } // 增加套节字上的重叠I/O计数和读序列号计数 pContext->nOutstandingRecv ++; pContext->nReadSequence ++; ::LeaveCriticalSection(&pContext->Lock); return TRUE;}BOOL CIOCPServer::PostSend(CIOCPContext *pContext, CIOCPBuffer *pBuffer){ // 跟踪投递的发送的数量，防止用户仅发送数据而不接收，导致服务器抛出大量发送操作 if(pContext->nOutstandingSend > m_nMaxSends) return FALSE; // 设置I/O类型，增加套节字上的重叠I/O计数 pBuffer->nOperation = OP_WRITE; // 投递此重叠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("发送失败！错误码：%d",x); return FALSE; } } // 增加套节字上的重叠I/O计数 ::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){ // 检查服务是否已经启动 if(m_bServerStarted) return FALSE; // 保存用户参数 m_nPort = nPort; m_nMaxConnections = nMaxConnections; m_nMaxFreeBuffers = nMaxFreeBuffers; m_nMaxFreeContexts = nMaxFreeContexts; m_nInitialReads = nInitialReads; // 初始化状态变量 m_bShutDown = FALSE; m_bServerStarted = TRUE; // 创建监听套节字，绑定到本地端口，进入监听模式 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); // 创建完成端口对象 m_hCompletion = ::CreateIoCompletionPort(INVALID_HANDLE_VALUE, 0, 0, 0); // 加载扩展函数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); // 加载扩展函数GetAcceptExSockaddrs GUID GuidGetAcceptExSockaddrs = WSAID_GETACCEPTEXSOCKADDRS; ::WSAIoctl(m_sListen, SIO_GET_EXTENSION_FUNCTION_POINTER, &GuidGetAcceptExSockaddrs, sizeof(GuidGetAcceptExSockaddrs), &m_lpfnGetAcceptExSockaddrs, sizeof(m_lpfnGetAcceptExSockaddrs), &dwBytes, NULL, NULL ); // 将监听套节字关联到完成端口，注意，这里为它传递的CompletionKey为0 ::CreateIoCompletionPort((HANDLE)m_sListen, m_hCompletion, (DWORD)0, 0); // 注册FD_ACCEPT事件。 // 如果投递的AcceptEx I/O不够，线程会接收到FD_ACCEPT网络事件，说明应该投递更多的AcceptEx I/O WSAEventSelect(m_sListen, m_hAcceptEvent, FD_ACCEPT); // 创建监听线程 m_hListenThread = ::CreateThread(NULL, 0, _ListenThreadProc, this, 0, NULL); return TRUE;}void CIOCPServer::Shutdown(){ if(!m_bServerStarted) return; // 通知监听线程，马上停止服务 m_bShutDown = TRUE; ::SetEvent(m_hAcceptEvent); // 等待监听线程退出 ::WaitForSingleObject(m_hListenThread, INFINITE); ::CloseHandle(m_hListenThread); m_hListenThread = NULL; m_bServerStarted = FALSE;}DWORD WINAPI CIOCPServer::_ListenThreadProc(LPVOID lpParam){ CIOCPServer *pThis = (CIOCPServer*)lpParam; // 先在监听套节字上投递几个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); } // 构建事件对象数组，以便在上面调用WSAWaitForMultipleEvents函数 HANDLE hWaitEvents[2 + MAX_THREAD]; int nEventCount = 0; hWaitEvents[nEventCount ++] = pThis->m_hAcceptEvent; hWaitEvents[nEventCount ++] = pThis->m_hRepostEvent; // 创建指定数量的工作线程在完成端口上处理I/O for(int i=0; i<MAX_THREAD; i++) { hWaitEvents[nEventCount ++] = ::CreateThread(NULL, 0, _WorkerThreadProc, pThis, 0, NULL); } // 下面进入无限循环，处理事件对象数组中的事件 while(TRUE) { int nIndex = ::WSAWaitForMultipleEvents(nEventCount, hWaitEvents, FALSE, 60*1000, FALSE); // 首先检查是否要停止服务 if(pThis->m_bShutDown || nIndex == WSA_WAIT_FAILED) { // 关闭所有连接 pThis->CloseAllConnections(); ::Sleep(0); // 给I/O工作线程一个执行的机会 // 关闭监听套节字 ::closesocket(pThis->m_sListen); pThis->m_sListen = INVALID_SOCKET; ::Sleep(0); // 给I/O工作线程一个执行的机会 // 通知所有I/O处理线程退出 for(int i=2; i<MAX_THREAD + 2; i++) { ::PostQueuedCompletionStatus(pThis->m_hCompletion, -1, 0, NULL); } // 等待I/O处理线程退出 ::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）定时检查所有未返回的AcceptEx I/O的连接建立了多长时间 if(nIndex == WSA_WAIT_TIMEOUT) { pBuffer = pThis->m_pPendingAccepts; while(pBuffer != NULL) { int nSeconds; int nLen = sizeof(nSeconds); // 取得连接建立的时间 ::getsockopt(pBuffer->sClient, SOL_SOCKET, SO_CONNECT_TIME, (char *)&nSeconds, &nLen); // 如果超过2分钟客户还不发送初始数据，就让这个客户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事件对象受信，说明投递的Accept请求不够，需要增加 { ::WSAEnumNetworkEvents(pThis->m_sListen, hWaitEvents[nIndex], &ne); if(ne.lNetworkEvents & FD_ACCEPT) { nLimit = 50; // 增加的个数，这里设为50个 } } else if(nIndex == 1) // 3）m_hRepostEvent事件对象受信，说明处理I/O的线程接受到新的客户 { nLimit = InterlockedExchange(&pThis->m_nRepostCount, 0); } else if(nIndex > 1) // I/O服务线程退出，说明有错误发生，关闭服务器 { pThis->m_bShutDown = TRUE; continue; } // 投递nLimit个AcceptEx I/O请求 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 启动... \n");#endif // _DEBUG CIOCPServer *pThis = (CIOCPServer*)lpParam; CIOCPBuffer *pBuffer = NULL; DWORD dwKey; DWORD dwTrans; LPOVERLAPPED lpol; while(TRUE) { // 在关联到此完成端口的所有套节字上等待I/O完成 BOOL bOK = ::GetQueuedCompletionStatus(pThis->m_hCompletion, &dwTrans, (LPDWORD)&dwKey, (LPOVERLAPPED*)&lpol, WSA_INFINITE); if(dwTrans == -1) // 用户通知退出 {#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) // 在此套节字上有错误发生 { printf("完成端口套接字上有错误：%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）首先减少套节字上的未决I/O计数 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）检查套节字是否已经被我们关闭 if(pContext->bClosing) {#ifdef _DEBUG ::OutputDebugString(" 检查到套节字已经被我们关闭 \n");#endif // _DEBUG if(pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0) { ReleaseContext(pContext); pContext = NULL; } // 释放已关闭套节字的未决I/O ReleaseBuffer(pBuffer); pBuffer = NULL; return; } } else { RemovePendingAccept(pBuffer); } // 3）检查套节字上发生的错误，如果有的话，通知用户，然后关闭套节字 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(" 检查到客户套节字上发生错误 \n");#endif // _DEBUG } else // 在监听套节字上发生错误，也就是监听套节字处理的客户出错了 { // 客户端出错，释放I/O缓冲区 if(pBuffer->sClient != INVALID_SOCKET) { ::closesocket(pBuffer->sClient); pBuffer->sClient = INVALID_SOCKET; }#ifdef _DEBUG ::OutputDebugString(" 检查到监听套节字上发生错误 \n");#endif // _DEBUG } ReleaseBuffer(pBuffer); pBuffer = NULL; return; } // 开始处理 if(pBuffer->nOperation == OP_ACCEPT) { if(dwTrans == 0) {#ifdef _DEBUG ::OutputDebugString(" 监听套节字上客户端关闭 \n");#endif // _DEBUG if(pBuffer->sClient != INVALID_SOCKET) { ::closesocket(pBuffer->sClient); pBuffer->sClient = INVALID_SOCKET; } } else { // 为新接受的连接申请客户上下文对象 CIOCPContext *pClient = AllocateContext(pBuffer->sClient); if(pClient != NULL) { if(AddAConnection(pClient)) { // 取得客户地址 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); // 关联新连接到完成端口对象 ::CreateIoCompletionPort((HANDLE)pClient->s, m_hCompletion, (DWORD)pClient, 0); // 通知用户 pBuffer->nLen = dwTrans; OnConnectionEstablished(pClient, pBuffer); if(pClient->bClosing && pClient->nOutstandingRecv == 0 && pClient->nOutstandingSend == 0) { ReleaseContext(pClient); pContext = NULL; } else if(pClient->hTimer == NULL)//接收一个客户端的同时创建一个检测I/O超时的Timer { pClient->hCompletion = m_hCompletion; CreateTimerQueueTimer(&pClient->hTimer,m_hTimerQueue,(WAITORTIMERCALLBACK)TimerRoutine,(PVOID)pClient,60*1000,0,0); } // 向新连接投递Read请求或者Write请求，直接关闭这些空间在套节字关闭或出错时释放// CIOCPBuffer *p = AllocateBuffer(BUFFER_SIZE);// if(p != NULL)// {// if(!PostRecv(pClient, p))// {// CloseAConnection(pClient);// }// } } else // 连接数量已满，关闭连接 { CloseAConnection(pClient); ReleaseContext(pClient); pContext = NULL; } } else { // 资源不足，关闭与客户的连接即可 ::closesocket(pBuffer->sClient); pBuffer->sClient = INVALID_SOCKET; } } // Accept请求完成，释放I/O缓冲区 ReleaseBuffer(pBuffer); pBuffer = NULL; // 通知监听线程继续再投递一个Accept请求 ::InterlockedIncrement(&m_nRepostCount); ::SetEvent(m_hRepostEvent); } else if(pBuffer->nOperation == OP_READ) { if(dwTrans == 0) // 对方关闭套节字 { // 先通知用户 pBuffer->nLen = 0; OnConnectionClosing(pContext, pBuffer); // 再关闭连接 CloseAConnection(pContext); // 释放客户上下文和缓冲区对象 if(pContext->nOutstandingRecv == 0 && pContext->nOutstandingSend == 0) { ReleaseContext(pContext); pContext = NULL; } ReleaseBuffer(pBuffer); pBuffer = NULL; } else { pBuffer->nLen = dwTrans; // 按照I/O投递的顺序读取接收到的数据 CIOCPBuffer *p = GetNextReadBuffer(pContext, pBuffer); while(p != NULL) { // 通知用户 OnReadCompleted(pContext, p); // 增加要读的序列号的值 ::InterlockedIncrement((LONG*)&pContext->nCurrentReadSequence); // 释放这个已完成的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) { //重置监视时间，当一个投递完成后，60s内无任何交互则断开。 ChangeTimerQueueTimer(m_hTimerQueue,pContext->hTimer,60*1000,0); } // 继续投递一个新的接收请求 // pBuffer = AllocateBuffer(BUFFER_SIZE); //if(pBuffer == NULL || !PostRecv(pContext, pBuffer)) //{ // CloseAConnection(pContext); //} } } else if(pBuffer->nOperation == OP_WRITE) { if(dwTrans == 0) // 对方关闭套节字 { // 先通知用户 pBuffer->nLen = 0; OnConnectionClosing(pContext, pBuffer); // 再关闭连接 CloseAConnection(pContext); // 释放客户上下文和缓冲区对象 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); } // 写操作完成，通知用户 if(dwTrans < pBuffer->nLen)//如果此send没有发送完全，则发送剩下的部分（此部分如果还是没发完全，这里同样进行） { printf("send未发送完全，发送：%d，总长度：%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; } // 释放SendText函数申请的缓冲区 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;}//投递接收请求示例//CIOCPBuffer *p = AllocateBuffer(BUFFER_SIZE);//if(p != NULL)//{// if(!PostRecv(pContext, p))// {// CloseAConnection(pContext);// }//}//投递发送请求示例//CIOCPBuffer *p = AllocateBuffer(BUFFER_SIZE);//if(p != NULL)//{// if(!PostSendToList(pContext, p))// {// CloseAConnection(pContext);// }//}void CIOCPServer::OnConnectionEstablished(CIOCPContext *pContext, CIOCPBuffer *pBuffer){ //连接建立，且第一次数据接收完成。 //接下来可以根据业务逻辑，PostRecv收或者PostSendToList发或者CloseAConnection(pContext)关闭连接}void CIOCPServer::OnConnectionClosing(CIOCPContext *pContext, CIOCPBuffer *pBuffer){}void CIOCPServer::OnReadCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer){ //一次数据接收完成。 //接下来可以根据业务逻辑，PostRecv收或者PostSendToList发或者CloseAConnection(pContext)关闭连接}void CIOCPServer::OnWriteCompleted(CIOCPContext *pContext, CIOCPBuffer *pBuffer){ //一次数据发送完成。 //接下来可以根据业务逻辑，PostRecv收或者PostSendToList发或者CloseAConnection(pContext)关闭连接}void CIOCPServer::OnConnectionError(CIOCPContext *pContext, CIOCPBuffer *pBuffer, int nError){}阅读全文
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