bgp explained

as epoll_ctl (EPOLLFD, Epoll_ctl_add, Socket, epollin); // register buffer non-empty event with data inflow Epoll_ctl (EPOLLFD, Epoll_ctl_del, Socket, epollout); // Register buffer is not full event, that is, the stream can be written to epoll_wait (EPOLLFD,...) Wait until the registered event occurs (note: When a buffer full or buffer is empty for a non-blocking stream, write/read returns1and sets Errno=eagain. Epoll only cares about buffer non-full and buffer non-empty events). The code

both ends of the link to previously agreed Valu Es. The receiver looks at the voltage in the These times; If it sees a logic high, it records a binary digit 1, or a 0 if the line was ' low ', or 0V. The receiver checks half between the start and the end of the pulse to ensure it doesn ' t mis-read the voltage on the L ine during the brief intervals while the voltage is rising or falling.If the devices has agreed to use a ' parity bit ' for rudimentary error-checking, that's calculated and sent

version. As in my Linux system can be compiled with the following command:cdqt#x2212;embedded#x2212;linux#x2212;commercial#x2212;4.4.1/tools/qconfig">CDQT−EMBEDDED−LINUX−COMMERCIAl− 4.4.1/tool / Qco nf ig Cdqt−embedded−linux−commercial−4.4.1/tools/qconfig/usr/local/trolltech/qt-4.4.3/bin/qmake$ makeRun after compilation succeeds./qconfig, initial to open qfeatures.txt. Qconfig reads the file to generate a tree graph that clearly shows the dependencies between the feature. As shown, if you

configuration: Pconn_timeout 1 minutePersistent_request_timeoutOfficial explanation: Long connection waits for the next request to arrive time-outApplication Scenario: Squid establishes a long connection with the client, the current request processing ends, and the time-out waiting for the next request to arrive.Dns_timeoutOfficial explanation: DNS Query time-outDefault configuration: Dns_timeout 2 minutesPositive_dns_ttlOfficial explanation: The correct DNS cache expiration timeApplicable scen

left panel of the projectProject Settings->projectProject Settings-ModulesSources PanelPaths PanelDependencies PanelProject Settings-> LibrariesProject Settings-> FacetsProject Settings-Artifactsabout adding a dependency packageYou can add a rack package to the Libraries tab, or a rack package in the corresponding module. The former can be set up together with the package and the individual name, to facilitate their own management of the rack package."IntelliJ idea" Project Structure

The Command Pattern: Encapsulates a request as an object, thereby letting-parameterize other objects with different requests, queue or log Requests, and support undoable operations 1 Public InterfaceCommand {2 Public voidexecute ();3 }4 5 Public classLightoncommandImplementsCommand {6 Light light ;7 8 PublicLightoncommand (light) {9 This. Light =Light ;Ten } One A Public voidExecute () { - Light.on (); - } the } - - Public classRemotecontrol { - Command slot; +

strategypattern, the responsibility for selecting the particularImplementation to use are done by the Client object and are given to theContext of the strategy pattern. Coupling of strategy with contextThe strategy pattern requires that the algorithms that are encapsulated must be outside the class (Context) in which they are used. That is to say that it either passes the information strategy needs to it (strategy), or it is obtained in other ways. Disadvantages:Have to crea

Recently when using MyBatis as a crud, just put the configuration files and mapping files to make the test can get sqlsessionfactory when there is caused by:java.lang.ClassNotFoundException:Cannot Find Class:usermapSearch and search on the Internet finally found the error, is their own mapping file configuration problems, the query returned is a collection, then its parameters is resultmap= "" and I wrote with alt+/Resulttype, so the program has not been normal operation, has been error ...650)

states of the TFTP client: statusDescriptionState_rrqIssue a read request pending approvalState_dataReceiving dataState_too_largeFile is too largeState_bad_magicBad magic numberState_oackReceive Oack FramesPackage TypeThere are 6 types of packets delivered using TFTP: typeDescriptionTftp_rrqRequest Read FileTftp_wrqRequest Write FileTftp_dataData packageTftp_ackConfirm PackageTftp_errorPackage with error messageTftp_oackOption acknowledge actively emits a oack frame when the server times out wi

$ git CherrypickUsing a new command-----Picking instructions (git cherry-pick) to commit on the new branch "replayPicking instructions----git cherry-pick The implication is to choose from a multitude of submissions the applicationThe current work branch. The command needs to provide a commit ID as an argument. The procedure is equivalent to submitting theExported as a patch file and then replayed on the current head, forming five-way content or submitting a consistent commit.Some common commands

release of the C6 and then use the C4 ', the other people will therefore feedback the dual history to the shared backbone, Thus confusing everyone's audiovisual. ）。If you think of a rebase as a means of cleaning up the commit history before push, and just the ones that have not yet been made public, there's no problem . A frustrating problem arises if the submitted objects that have already been exposed have been developed and others have been followed up based on those submissions.3.7 SummaryR

address error to wait for the cache to clear and then re-resolve to obtain the address. General cache cleanup is about 2 hours.3, the DNS service access relationship, the client Access DNS server is recursive, the DNS server must give the client a result. While the DNS server accesses each domain server for the iteration (Die Dai) by each domain server to give the next hop address, and then by the DNS server to access the domain server address and then resolve the final destination host IP addr

provides tools to help you combine multiple modules into one7.parsetoolapplication, contains the LALR-1 generation parser YECC (similar to YACC), lexical analysis generator Leex8.reltool Release Management tool that provides graphical front end and back end hooks that can be used to build common systems9.runtime_toolsapplication, offers some very useful tools, dyntrace (Dynamic Trace), System_information (System probe), DBG ( Text-based trace, which contains the user-friendly trace bifs), etc.

: F (l,4)-----> This time found that 4 is the number to delete.Call the IF2 sectionThe processing code is: L2 = L2->next (do you see the problem?) ）(L1 and L2 the same as L, in order to better explain the special distinction is added subscript. ）In fact, L2 = = L1->next (that is, L1->next is the next field of Node 3)The execution of l2= L2->next is now equivalent to pointing 3 of the next field to the 5 pointer field. (L1->next = L2->next.) So, in the process of this deletion, we still implicitl

6 7 8 9 10 11 We're starting from the next 1, which means the dead next (number 4) is the beginning of the new ring (number 3) is the end of the new ring is to put the number 4 forward K (3) to make him a new ring start 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6

Strange URL, which fairy explained under this URL Just entered a PHP project, the system has a page to turn, the browser address bar displays the following URL: Http://xxx.com/index.php/member-orderPayments-2015071611557932.html Very not understand, http://xxx.com/index.php/to here, has been defined to a resource, but why there is another resource: member-orderpayments-2015071611557932.html You fairy to explain, this is why son ah. Note: Access to th

1, (function ($) {...}) (JQuery);1), principle:This is actually an anonymous function, as follows:Function (ARG) {...}This defines an anonymous function with a parameter of ARGWhen calling a function, the parentheses and arguments are written after the function, and because of the precedence of the operator, the function itself needs parentheses, namely:(function (ARG) {...}) (param)This is equivalent to defining an anonymous function with a parameter of ARG, and calling this anonymous function

Lock convoys explained Pan aimin, 2010-10-9 Lock convoys is a performance degradation problem caused by the use of locks in multi-thread Concurrent Environments. When multiple threads with the same priority frequently compete for the same lock, it may cause the lock convoys problem. Generally, the lock convoys will not stop the application logic like deadlock or livelock. On the contrary, the system or application suffering from lock convoys still ru

Difference between pointer and reference in C ++ (explained on the Internet) ★Similarities: ● It is an address concept. // It acts on an address. The Pointer Points to a piece of memory. Its content refers to the memory address, and the reference is the alias of a piece of memory. ★Differences: ● A pointer is an entity, and a reference is only an alias; ● The reference can only be initialized once during definition, but cannot be changed after

Design Pattern Explained Reading Notes 4 -- Strategy, patternexplainedWhat? Define a family of algorithms, encapsulate each one, andMake them interchangeable. Strategy lets the algorithmVary independently from the clients that use it. -- GOF Define a series of algorithms, encapsulate each and make each encapsulation replaceable. The Strategy Mode replaces these algorithms in a client independent of these algorithms. Each algorithm is freely replaced,