lesson16線程同步方式及套接字編程

#include<windows.h>#includeDWORDWINAPILPVOID //threadDWORDWINAPILPVOID //threadintHANDLEvoid{HANDLEhThread1;HANDLE{{cout<<"onlyinstancecanrun!"<<endl;}} }DWORDWINAPILPVOID //thread){{{}

cout<<"thread1sellticket:"<<tickets--}return}DWORDWINAPILPVOID //thread){{{}

cout<<"thread2sellticket:"<<tickets--}return}API使用一個(gè) #include<windows.h>#includeDWORDWINAPILPVOID //threadDWORDWINAPILPVOID //threadintCRITICAL_SECTIONg_csA;void{HANDLEhThread1;HANDLE}DWORDWINAPILPVOID //thread){{{}

cout<<"thread1sellticket:"<<tickets--}return}DWORDWINAPILPVOID //thread){{{}

cout<<"thread2sellticket:"<<tickets--}cout<<"thread2isrunning!"<<endl;return0;}而在非阻塞模式下，Winsock函數(shù)無(wú)論如何都會(huì)立即返回。WindowsSockets的異步選擇函數(shù)WSAAsyncSelect()提供了消息機(jī)制的網(wǎng)絡(luò)選擇，當(dāng)使WSAAsyncSelect()為指定的套接字請(qǐng)求基于Windows消息的網(wǎng)絡(luò)通知，并自動(dòng)將該套intWSAEnumProtocols(LPINTlpiProtocols,LPWSAPROTOCOL_INFOlpProtocolBuffer,ILPDWORDlpdwBufferLength);Winsock2，就可以編寫(xiě)可直接使用任何一種協(xié)議的網(wǎng)絡(luò)應(yīng)用lpiProtocolsNULLlpiProtocols為lpProtocolBuffer[out]WSAPROTOCOL_INFOWSAPROTOCOL_INFO結(jié)構(gòu)體用來(lái)存放或得到一個(gè)指定協(xié)議的完整信息。lpdwBufferLength[in,out]，在輸入時(shí)，指定傳遞給WSAEnumProtocols()函數(shù)的lpProtocolBuffer緩沖區(qū)的長(zhǎng)度；在輸出時(shí)，存有獲取所有請(qǐng)求信息需傳遞給WSAEnumProtocols()函數(shù)的最小緩沖區(qū)長(zhǎng)度。這個(gè)函數(shù)不能重復(fù)調(diào)用，傳入的緩沖區(qū)必須足夠大以便能存放所有的元素。這個(gè)規(guī)定降低了該函數(shù)的復(fù)雜度，并且由于一個(gè)機(jī)器上裝WSAStartup()函數(shù)將初始化進(jìn)程使用的WS2_32.DLLSOCKETWSASocket(intaf,inttype,intprotocol,LPWSAPROTOCOL_INFOlpProtocolInfo,GROUPg,DWORDdwFlags);Winsock庫(kù)中的擴(kuò)展函數(shù)WSASocketlpProtocolInfo，一個(gè)指向WSAPROTOCOL_INFO結(jié)構(gòu)體的指針，該結(jié)構(gòu)定義了所創(chuàng)建的套lpProtocolInfoNULLWinSock2DLL使用前三個(gè)參數(shù)來(lái)決定使用gintWSARecvFrom(SOCKETs,LPWSABUFlpBuffers,DWORDdwBufferCount,LPDWORDlpNumberOfBytesRecvd,LPDWORDlpFlags,structsockaddrFAR*lpFrom,LPINT pletionRoutinelpBuffers，[in,out]WSABUFWSABUF結(jié)構(gòu)體包含一個(gè)dwBufferCountlpBuffers數(shù)組中WSABUFlpOverlapped，一個(gè)指向WSAOVERLAPPED結(jié)構(gòu)體的指針(對(duì)于非套接字則忽略)pletionRoutineintWSASendTo(SOCKETs,LPWSABUFlpBuffers,DWORDdwBufferCount,LPDWORDlpNumberOfBytesSent,DWORDdwFlags,conststructsockaddrFAR*lpTo,int pletionRoutinelpBuffersWSABUFWSABUF結(jié)構(gòu)體包含一個(gè)緩沖區(qū)的dwBufferCount，lpBuffers數(shù)組中WSABUF結(jié)構(gòu)體的數(shù)目。iToLen，lpTo中地址的長(zhǎng)度。lpOverlapped，一個(gè)指向WSAOVERLAPPED結(jié)構(gòu)的指針(對(duì)于非套接字則忽略)pletionRoutine上庫(kù)文件，這次的是2.2版本。WSACleanup()寫(xiě)在析構(gòu)函數(shù)中。CChatDlgm_socket（SOCKET類(lèi)型）,在析構(gòu)函數(shù)中釋放這BOOLCChatDlg::InitSocket()WSASocket()創(chuàng)建套接字（數(shù)據(jù)報(bào)類(lèi)UDP型的）。然后調(diào)用WSAAsyncSelect(m_socket,m_hWnd,UM_SOCK,FD_READ)為網(wǎng)絡(luò)定義消息！此時(shí)如果發(fā)生FD_READ消息（只請(qǐng)求了數(shù)據(jù)），系統(tǒng)會(huì)發(fā)送UM_SOCK消息給CXXDlgOnInitDialogInitSocket()。BOOLCChatDlg::OnInitDialog()完成頭文件中：#defineUM_SOCKWM_USER+1afx_msgvoidOnSock(RAM,LPARAM);{ {caseFD_READ://作為一種良好的代碼風(fēng)格，應(yīng)該在此函數(shù)中判斷是否是網(wǎng)絡(luò)WSABUFwsabuf;wsabuf.buf=newchar[200];DWORDDWORDintlen=sizeof(SOCKADDR);CStringstr;CStringHOSTENT{}//str.Format("%s:%s",inet_ntoa(addrFrom.sin_addr),wsabuf.buf);str.Format("%s說(shuō):%s",pHost->h_name,wsabuf.buf);}}voidCChatDlg::OnBtnSend(){//TODO:AddyourcontrolnotificationhandlercodehereDWORDd