epoll com

IO multiplexing: A process can monitor multiple descriptors and, once a descriptor is read-ready or written, notifies the process program to read and write accordinglyUsage scenarios:1. When the customer processes multiple descriptors (network sockets) or one customer processes multiple sockets simultaneouslyThe 2.TCP server handles both the listener socket interface and the connected socket.3. One server to handle multiple services or multiple protocols also use I/O multiplexingThe maximum bene

Use epoll2007-01-18 at in Ace Thursday, June 8 th, 2006Obviously, the title of the article determines that Ace is used in Linux. We know that ace uses select to implement Reactor by default in Linux. The advantages of epoll over select are no longer mentioned here. Let's talk about the operation steps directly:First, recompile the ace library.The ACE Library supports epoll through the ace_dev_poll_

Python code: Import socket, logging Import select, errno Logger = logging. getlogger ("network-server ") Def initlog ():Logger. setlevel (logging. Debug) FH = logging. filehandler ("network-server.log ")FH. setlevel (logging. Debug)Ch = logging. streamhandler ()Ch. setlevel (logging. Error)Formatter = logging. formatter ("% (asctime) S-% (name) S-% (levelname) S-% (Message) s ")Ch. setformatter (formatter)FH. setformatter (formatter)Logger. addhandler (FH)Logger. addhandler (CH) If _ name _ = "

1. concept-based Epoll is a mechanism for processing the read/write sequence of a large number of concurrent connections to current events. InLinuxNetwork Programming, used for a long timeSelectDo itEvent triggering.2.5.xAfter the kernel, introduceEpoll. epoll is > Linux kernel improvements for handling large volumes of handles poll , yes Linux multiplexing Io interface sele

Article: Http://blogs.sun.com/alanb/entry/epoll JDK 6.0 NiO supports epoll, which greatly improves the performance of concurrent idle connections. This is a lot of network server applications.ProgramYes. One of the updates in build 59Mustang(Javatm SE 6)Is that the new I/OSelectorImplementation will useEpoll Event NotificationFacility when running on the Linux 2.6 kernel. JDK 5.0 Update 9 is also supp

Com -- Component Object Model (Component Object Model) is a set of software development methods and specifications proposed by Microsoft. It also represents a software development idea, that is, the idea of component-oriented programming.COM programming ideology-component-oriented programming ideology (COP) As we all know, the transition from process-oriented programming to object-oriented programming is realized from C to C ++. The emergence of

I. In-process components and out-of-process Components As mentioned above, COM components support both in-process components and out-of-process components. The advantage of in-process components is fast and convenient. However, if any component crashes, the main process will crash. Components outside the process are slow but stable. If a component crashes somewhere, at most there is no result and the main process will not crash (for example, if the

Java uses epoll for NiO Processing NIO of JDK 6.0 and JDK 5.0 Update 9 supports epoll (Linux only), which greatly improves the performance of concurrent idle connections, which is required by many network server applications. The method for enabling is as follows: -Djava. NiO. channels. SPI. selectorprovider = sun. NiO. Ch. epollselectorprovider For example, if Tomcat running in Linux uses NiO connect

Today the code is written on the inexplicable flash back, the phone does not "program stop running" prompt, Logcat also did not see the blue call stack log, such a flash back most is the egg ache, fortunately must now. After several times, I finally saw a row of suspicious logs from the Logcat: A/Looper: Could not create epoll instance. errno=24 It looked like it was on the native layer again. This article has documented the analytical process of the

It's nothing today. Practice Python's epoll and start by writing a client:#!/usr/pythonImportSOCKET,SYS,SELECTC=Socket.socket (Socket.af_inet,socket. SOCK_STREAM) Host='127.0.0.1'Port=57777C.connect ((host,port)) epoll_fd=Select.epoll () Epoll_fd.register (C.fileno (), select. Epollin) Epoll_fd.register (Sys.stdin.fileno (), select. Epollin) Str="" whiletrue:e_list=Epoll_fd.poll () forFd,eventsinche_list:ifFD = = C.fileno () andeventsSelect. Epollin:b

Over the past few days, I have been working on a large volume of data solutions for linux. I have continuously learned about aio, epoll, libevent, boost: asio. In the past, I only knew that they are both asynchronous and non-blocking, but what are the key points to solve the problem? Through these several days of in-depth understanding, I will summarize them:Aio is the asynchronous IO implemented by the kernel after linux2.6, or it is the true asynchr

For some experiences related to linuxsocket and epoll cooperation-general Linux technology-Linux programming and kernel information, the following is a detailed description. From: lingxiao web tribe There are not many profound things that are well documented. Although simple, it is easy to get confused if you haven't done any tests. Int nRecvBuf = 32*1024; // set it to 32 K Setsockopt (s, SOL_SOCKET, SO_RCVBUF, (const char *) nRecvBuf, sizeof

Python code: import socket, loggingImport select, errnoLogger = logging. getLogger ("network-server ")Def InitLog ():Logger. setLevel (logging. DEBUG)Fh = logging. FileHandler ("network-server.log ")Fh. setLevel (logging. DEBUG)Ch = logging. StreamHandler ()Ch. setLevel (logging. ERROR)Formatter = logging. Formatter ("% (asctime) s-% (name) s-% (levelname) s-% (message) s ")Ch. setFormatter (formatter)Fh. setFormatter (formatter)Logger. addHandler (fh)Logger. addHandler (ch)If _ name _ = "_ main

Original: 1190000003063859I've only extracted the Epoll code example, the server-side code#defineIPADDRESS "127.0.0.1"#definePORT 8787#defineMAXSIZE 1024#defineListenq 5#defineFdsize 1000#defineEpollevents 100LISTENFD=Socket_bind (ipaddress,port);structepoll_event events[epollevents];//Create a descriptorEPOLLFD =epoll_create (fdsize);//Adding a Listener descriptor eventadd_event (Epollfd,listenfd,epollin);//Loop Wait for ( ; ; ) { //The function r

A simple Epoll demo that accepts multiple client connections and converts the received string to uppercase to return to the client1#include 2#include 3#include 4#include 5#include 6 #defineMaxLen 10247 #defineServ_port 80008 #defineMAX_OPEN_FD 10249 Ten intMainintargcChar*argv[]) One { A intListenfd,connfd,efd,ret; - CharBuf[maxlen]; - structsockaddr_in cliaddr,servaddr; thesocklen_t Clilen =sizeof(CLIADDR); - structepoll_event TEP,EP[

Epoll efficient mechanism is actually the kernel callback, we know that Linux socket is also treated as file, but the underlying driver is not the same. Let's take a look at the kernel file structure: struct File_operations { struct module *owner; loff_t (*llseek) (struct file *, loff_t, int); ssize_t (*read) (struct file *, char *, size_t, loff_t *); ssize_t (*write) (struct file *, const char *, size_t, loff_t

For beginners, COM is not a very clear definition. It represents both a component specification and an implementation. In short, COM is a component model at the language layer, because different development environments often need to cooperate with each other to complete a certain function, thus promoting the emergence of COM.

port_number [ip_address]\n", BaseName (argv[0])); return 1; } intPort = atoi (argv[1]); intRET =0; Sockaddr_in address; Bzero (address,sizeof(address)); Address.sin_family=af_inet; if(ARGC >=3) { Const Char*ip =argv[2]; Inet_pton (Af_inet, IP,address.sin_addr); } Else{address.sin_addr.s_addr=Inaddr_any; } address.sin_port=htons (port); intLISTENFD = socket (pf_inet, Sock_stream,0); ASSERT (LISTENFD>=0); RET= Bind (LISTENFD, (sockaddr*) address,sizeof(address)

handles multiple connections simultaneously (IO multiplexing), the Select,poll,epoll we discuss is based on this idea. The simplest way to do this is to cycle through each request, each connected to a socket, when all the sockets have data, this method is feasible, but when the application read a socket file data is not ready, The entire application blocks here to wait for the file handle, even if the other file handle is ready and cannot be proc

Epoll is more efficient than poll and select multiplexing I/O models. The epoll function is very simple. The trouble lies in horizontal start and edge triggering. Use a graph to describe Et (edge) is only triggered when the status is reversed, for example, it is never readable. However, if it is readable, it will always be triggered. So we need to do some extra processing when using et. For example, we can