择善教育-linux阶段复习

复习-共享内存共享内存使用1:ftok使用某个文件做关键字创建key2:shmget使用key创建(打开)共享内存shmid3:shmat打开(映射)共享内存.(attach)4:使用(读写)共享内存5:shmdt释放共享内存.(detach)6:shmctl删除共享内存复习-多线程编程多线程创建pthread_create(&threadId,&attr,threadFun,&args)pthread_join(threadId,&pRet)阻塞等待线程结束pthread_exit(&ret)复习-多线程编程线程属性pthread_attr_init(pthread_attr_t*attr)pthread_attr_setXXX(&attr,XXX)pthread_attr_getXXX(&attr,XXX)pthread_attr_destroy(pthread_attr_t*attr)分离属性：detachstate

可连接，不可连接调度策略：schedpolicy

分时调度，先到先得，时间片轮转复习-多线程编程线程属性优先级：schedparam

优先级值structsched_paramparam.sched_priority继承性：inheritsched继承父进程调度属性，不继承父进程调度属性作用域：scope系统调度，用户调度复习-多线程编程线程互斥pthread_mutex_tmutexpthread_mutexattr_tattrpthread_mutexattr_settype(&attr,type)pthread_mutexattr_gettype(&attr,&type)普通锁：NORMAL，DEFAULT检错锁：ERRORCHECK不阻塞嵌套锁：RECURSIVE允许同线程多次锁定复习线程互斥pthread_mutex_init(&mutex,&attr)pthread_mutex_lock(&mutex)pthread_mutex_trylock(&mutex)pthread_mutex_unlock(&mutex)复习-网络通信TCP通信-serverstructsockaddr_inaddrsocklen_taddrlen=sizeof(addr)fd=socket(PF_INET,SOCK_STREAM,0)iRet=bind(fd,(structsockaddr*)&addr,sizeof(addr))iRet=listen(fd,num)clientfd=accept(fd,(structsockaddr*)&addr,&addrlen)iLen=read(clientfd,szBuf,BUFSIZ)iLen=write(clientfd,szSnd,BUFSIZ)复习-网络通信TCP通信–clientfd=socket(PF_INET,SOCK_STREAM,0)iRet=connect(fd,(structsockaddr*)&addr,sizeof(addr))iLen=write(fd,szBuf,BUFSIZ)iLen=read(fd,szBuf,BUFSIZ)复习-网络通信UDP通信-server/clientfd=socket(PF_INET,SOCK_DGRAM,0)iRet=bind(fd,&addr,sizeof(addr))iLen=sendto(fd,szBuf,BUFSIZ,0,&destAddr,addrlen)iLen=recvfrom(fd,szBuf,BUFSIZ,0,&srcAddr,&addrlen)复习-网络通信底层数据报抓取fd=socket(PF_INET,SOCK_RAW,

IPPROTO_TCP)iRet=bind(fd,(structsockaddr*)&addr,sizeof(addr))iLen=read(fd,szBuf,BUFSIZ)pIpHeader=(IP_HEADER*)szBufpTcpHeader=(TCP_HEADER*)(szBuf+sizeof(IP_HEADER))复习-并发通信select模型fd_setfdset监控集合FD_ZERO(&fdset)清空集合(初始化)FD_SET(fd,&fdset)增加fd到监控集合select(maxfd+1,&fdset,NULL,NULL,NULL)监控FD_ISSET(fd,&fdset)fd被监控到可读复习-并发通信poll模型structpollfdfds[num]定义轮询集合fds[i].fd=fd设置轮询监控fdfds[i].events=POLLIN设置轮询监控事件poll(fds,num,-1)轮询监控fds[i].revents&POLLINfds[i]事件到达复习-并发通信epoll模型epfd=epoll_create(size)创建监控管理fdstructepoll_eventevev.events=EPOLLIN监控的事件ev.data.fd=fd监控的fdepoll_ctl(epfd,EPOLL_CTL_ADD,fd,&ev)增加监控structepoll_eventevs[maxEvs]并发处理量num=epoll_wait(epfd,evs,maxEvs,-1)监控复习-并发通信epoll模型for(i=0;i<num;i++){//evs[i].data.fd文件描述符处理}复习–数据库数据库操作MYSQLconn;mysql_init(&conn)mysql_real_connect(&conn,HOST,USER,PASS,DB_NAME,0,NULL,0)复习–数据库数据库操作mysql_real_query(&conn,sqlStr,strlen(sqlStr))MYSQL