wdm multiplexing

descriptor corresponds to an event handle, In order to achieve the upper limit of the waiting event required by this function, wsawaitformultipleevents can also be used to associate multiple sockets to an event handle through a wsaeventselect call. WSAWaitForMultipleEvents waits for only one event, so that more than 64 sockets can be reused. 3 The lnetworkevents of the event returned with Wsaenumnetworkevents and fd_xxxx should not be if...else if...else if, if ..., if ..., Because sometimes a

prone to develop epoll-based applications in the LT mode. If the event occurs in the ET mode, if the buffer data is not completely processed, the user request in the buffer will not be responded to.Why Epollet mode FD must be set to non-blocking:The ET (edge trigger) data is ready only to be notified at a time, that is, if you want to use the ET pattern, you need to read it until the error or completion occurs when the data is ready. However, if the current FD is blocked (default), then when th

; Event. DATA.FD =CONNFD; Epoll_ctl (PEFD, Epoll_ctl_add, CONNFD,Event); printf ("Connect another client\n"); } Else { intNread =Read (EP_EVENTS[I].DADA.FD, buf, buf_size); if(Nread = =0) {close (EP_EVENTS.DATA.FD); Epoll_ctl (EPFD, Epoll_ctl_del, EP_EVENTS.DATA.FD, NULL); printf ("disconnect with a client\n"); } Else{Write (EP_EVENTS[I].DATA.FD, buf, nread); }}}} close (LISTENFD); Close (EPFD); return 0;}voidError_hand

The following method must be used in the custom section-(ID) Initwithstyle: (Uitableviewcellstyle) style Reuseidentifier: (NSString *) reuseidentifier{ if (self =[Super Initwithstyle:style Reuseidentifier:reuseidentifier]) { = [ Zccontrol Createimageviewwithframe:cgrectmake (00) Imagename:nil]; [Self.contentview AddSubview:self.bgImageView]; } return Self ;}The other is the same as using the system's own cell method when it is reused.Customizing Tabelviewcell

)/_xlabelwidth); Nsinteger LastIndex= (Nsinteger) Floorf ((maxx-jayylabelwidth)/_xlabelwidth); if(firstindex0) {FirstIndex=0; } if(lastindex>=[Self.labelnames Count]) {LastIndex= [Self.labelnames count]-1; } /*Reclaim labels that are not in range*/Nsinteger labelindex=0 ; for(Jaychartlabel *labelinchself.visiblelabels) {labelindex=Label.tag; if(labelindexLastIndex) {[Self.reusedlabels Addobject:label]; [Label Removefromsuperview]; }} [Self.visiblelabels minusSet:self.

-(UITableViewCell *) TableView: (UITableView *) TableView Cellforrowatindexpath: (Nsindexpath *) indexpath{StaticNSString *cellidentifier =@"Lefttableviewcell"; Lefttableviewcell*cell =[TableView Dequeuereusablecellwithidentifier:cellidentifier]; if(Cell = =Nil) {Cell= [[[[NSBundle mainbundle]loadnibnamed:@"Lefttableviewcell"Owner:nil Options:nil]lastobject]; }Else{//cell Reuse Problem Resolution if(Indexpath = =Lastindexpath) {//Cell.contentView.backgroundColor saved when clickin

PHP implements a code reuse method called trait, multiplexing trait Since php 5.4.0 , PHP has implemented a code reuse method called trait. Trait is a code reuse mechanism that is prepared for PHP-like single-inheritance languages. Trait to reduce the limitations of single-inheritance languages, developers are free to reuse method in separate classes within different hierarchies. 　　Trait is a solution for PHP multiple inheritance . For example, it wo

Socket programming practices in Linux (7) I/O multiplexing technology-select model Before entering the topic of today's select model, let's take a look at the five I/O models: (1) blocking I/O (this method is used by default) In server socket programming, our common accpet and recv functions are blocked. Taking recv as an example: When the upper-layer application calls the recv system call, if the peer does not send data (there is no data in the Linu

Create a Pin object MAPointAnnotation*pointAnnotation=[[MAPointAnnotation alloc]init];//where to insert the pin pointannotation.coordinate= cllocationcoordinate2dmake (39.989631,116.481018); //pin title pointannotation.title=@ "Fang Heng International"; //pin sub-title pointannotation.subtitle=@ "No. 6th, Fu Tong East Street"; [_mapviewaddannotation: Pointannotation];//The following methods can make the map pin pop-up bubble- (maannotationview*) Mapview: (mamapview*) mapview Viewforannotation:

=" Qq20160927005044.png "alt=" Wkiom1fpufci0wbwaabaoq1hne0226.png-wh_50 "/>Client 1650) this.width=650; "Src=" Http://s3.51cto.com/wyfs02/M02/88/16/wKioL1fpUjrD3uxiAAAll0njD24146.png-wh_500x0-wm_3 -wmp_4-s_4244803526.png "title=" Qq20160927005156.png "alt=" Wkiol1fpujrd3uxiaaall0njd24146.png-wh_50 "/>Client 2650) this.width=650; "Src=" Http://s4.51cto.com/wyfs02/M01/88/19/wKiom1fpUoCjyuP_AAAkjmdZIgc333.png-wh_500x0-wm_3 -wmp_4-s_991912699.png "title=" Qq20160927005303.png "alt=" Wkiom1fpuocjyup_

=socket (af_inet,sock_stream,0)) Perror ("Socket Error:");Exit (1);}Clen = sizeof (SERVER_ADDR);Bzero (server_addr,0);Server_addr.sin_family =af_inet;SERVER_ADDR.SIN_ADDR.S_ADDR=INET_ADDR ("127.0.0.1");Server_addr.sin_port =htons (port);if (Connect (ssock, (struct sockaddr *) server_addr,clen) Perror ("Connect error:");Exit (1);}while (1){printf ("Input msg:");Fgets (Writebuf,maxbuf,stdin);if (write (SSOCK,WRITEBUF,MAXBUF) {Perror ("Write Error:");}Readbytes=read (SSOCK,READBUF,MAXBUF);if (readb

Timeval time to 0, check the description immediately after the return, pollingvoid Fd_zero (fd_set* set); Initializes the file descriptor set to 0.void Fd_set (int FD, fd_set* SET); Put the file descriptor in the collection FD position 1void fd_clr (int FD, fd_set* set); Put the file descriptor in the collection FD position 0int fd_isset (int FD, fd_set* set); Test file descriptor Set if FD is 1 with return 1, no return 0Code:#include This article is from the "Sea" blog, be sure to keep this so

Sockets are also a kind of IO, blocking socket operations include: Input: recv (), Recvfrom (), block when buffer is empty Output: Send (), SendTo (), block when buffer is empty Accepted: Accept (), blocked when not connected Connect: Connect (), blocking when unresponsive, blocking a server round trip time for TCP connections Solutions Comparison: Select Poll Epoll Operation method Traverse Traverse Callback

Operation-set bit for read operations. static int Op_write Operation-set bit for write operations. Next, the introduction of the object in the NIO package. Some of the cart before the horse, but, this article does not use a lot of API, mainly reactor understand, non-blocking understand, the purpose is achieved. as described above, we can write a non-blocking server based on NIO. For a specific code example, you can see Resources (2).Resources:(1) A treatise o

", fd_setsize);Close (CONNFD);Continue}if (Connfd > Maxfd)MAXFD = CONNFD;Fd_set (CONNFD, allset); (4)if (--nready Continue}Handle (Clientsockfds, MAXFD, rset, allset);}}void handle (int * Clientsockfds, int Maxfds, fd_set* prset, fd_set* pallset) {int nread;int i;Char Buf[maxline];for (i = 0; iif (clientsockfds[i]! =-1) {if (Fd_isset (Clientsockfds[i], Prset)) {(5)Nread = Read (Clientsockfds[i], buf, MAXLINE);//Read Client socket streamif (Nread Perror ("read error");Close (Clientsockfds[i]);FD_

freeing the memory and stripping the waiting queue, and so on, is the same as O (n), and the specific code includes the part of the Do_sys_poll function that calls Do_poll to the end.6. Precautions1). The poll () function is not affected and constrained by the o_ndelay tag and the o_nonblock tag on the socket descriptor, that is, the poll () function will not be affected, regardless of whether the socket is blocked or non-blocking;2). The poll () function is supported only by individual operati

The pa.8 pin of the STM32 has a multiplexing function-clock output (MCO), which enables the STM32 internal clock to be output through pa.8. Operation Flow: 1), set pa.8 to multiplex push-pull mode. Gpio_initstructure.gpio_pin = Gpio_pin_8; Gpio_initstructure.gpio_speed = Gpio_speed_50mhz; Gpio_initstructure.gpio_mode = gpio_mode_af_pp; Gpio_init (Gpioa, gpio_initstructure); 2), select the output clock source. The selection of the clock is controlled b

Tags: Oracle controlfileI. Control file multiplexing1.show parameter control--View Control file informationShow Parameter SPFile--see if there are spfileCreate Pfile from SPFile;--Generate PfileShutdown immediate--Guanqu2. Modify the Pfile file to add multiple pathsVI $ORACLE _home/dbs/initorcl.oraCopy the original controlfile to the new add path directory;Cp......3.create SPFile from Pfile;--Generate SPFileStartup--Open DatabaseShow parameter control--See if control file information is multiple

immediate;$CP Control01.ctl Control03.ctlsql>startup;Sql> select * from V$controlfile;Sql>shutdown ImmediateSql>startupMethod Two:1, create Pfile from SPFile;2, Shutdown immediate3, modify the parameter file Initprod.ora CD $ORACLE _home/dbs VI Initprod.ora*.control_files= '/u01/app/oracle/oradata/prod/disk1/control01.ctl ', '/u01/app/oracle/oradata/prod/disk2/ Control02.ctl ', '/u01/app/oracle/oradata/prod/disk3/control03.ctl '4, copy control file multiple