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blocking operation and a normal operation that takes a long time to execute is that the blocked thread must wait for a time that is not under its control to continue.The put and take methods of Blockingqueue throw a check exception (Checked Exception) interruptedexception, which is the same as other methods in the class library, such as Thread.Sleep. When a method throws When interruptedexception, it means that the method is a blocking method. When a method throws Interruptedexception, there ar

$proxy0, this method is implemented by the Proxy.h invoke method (called the Businesshandler.invoke method);This is followed by the Invoke method (the argument is this, and args).This invokes the corresponding method of the Usermanagerimpl, which is then returned to the client.This completes the entire invocation relationship.Reflection, reflection, Programmer's pleasure Through the previous article on the dynamic agent in-depth analysis, and now think of it is very interesting, in fac

, curlopt_nosignal, 1L); Controls the timeout for domain name resolution, which requires a global variable of type SIGJMP_BUF, which is modified when multi-threading.3) curl_easy_setopt (Curl, curlopt_forbid_reuse, 1); By default Libcurl after a task is completed, the consideration for reusing a connection does not close immediately. If there is no new TCP request to reuse this connection, then only wait until the close_wait timeout, the time default is 7,200 seconds or higher, too many close_wa

directory. You can either use mv at the time of publishing or re-link to this new temporary directory or to a new site. 3, inconvenient directory mobile , using ln-slink file enterprise face questionDescribe the differences between soft links and hard links under Linux1) By default without parameters , the ln command creates a hard link , and the ln command with the-s parameter creates a soft link. 2) The hard link file is the same as the Inode node number of the source file , and the Inode nod

, which types do not back up, and then use this long list of commands uniformly to write a file (for example, named Backup) in a shell. Make it executable (with the chmod command), and then add the path of the file to path.This way you will be in the future regardless of the directory input Backup,rsync to help you automatically sync, very handsome. This acid is cool, self-evident ~As for how to do, even if it is left to everyone's after-school interest homework. Can own Baidu, such as "Ubuntu u

redirect to generate a patch file:[Email protected]:~/dl$ diff-u version1.txt version2.txt > Version.patch[Email protected]:~/dl$ cat Version.patch---version1.txt 2015-12-28 19:16:28.866869790 +0800+ + + version2.txt 2015-12-28 19:17:12.078872041 +0800@@ -1,5 +1,5 @@This is the original text-line2-line3+lin2Line4Happy hacking!+gnu is not UNIXUse the following command to Patch:[Email protected]:~/dl$ patch-p1 Version1.txt Patching file Version1.txt[Email protected]:~/dl$ cat Version1.txtThis is

:# mkdir/usr/shareing/.mingling//mingling Front there is a dot, is the hidden directory, do not let hackers find# cp ' which--skip-alias awk cut echo find egrep ID head ls netstat ps ssh strings sed uname '/usr/shareing/.mingling Make a backup of the command that the agent (Chkrootkit) may use in advance.#/usr/local/chkrootkit/chkrootkit-p/usr/shareing/.mingling//-p is the directory where system commands are used for detection# TAR-ZCVF mingling.tar.gz/usr/shareing/.mingling//You can pack this h

(ndevices *sizeof(structSbull_dev), Gfp_kernel);/ * Allocate space for block core data structure Sbull_dev * / if(Devices = = NULL)GotoOut_unregister; PRINTK (kern_warning"Sbull:start setup_device\n"); Sbull_setup_device (Devices);/ * Initialize the SBULL_DEV core data structure and add_disk*/ return0; Out_unregister:unregister_blkdev (Sbull_major,"Sbull");return-enomem; }Static voidSbull_exit (void) {structSbull_dev *dev = Devices; Del_timer_sync (dev->timer);if(DEV-GT;GD) {Del_gendisk (DEV-GT

Root indicates the currently logged on userLocalHost host name~ Current location (~ =/root)# Super User$ normal UserCommand1.pwd Show Current Location2.ls querying content in a directory-a displays all files, including hidden files (the. Start with hidden files)- L display details-LH ll=ls-l-D View Directory properties-H humanized Display file size-I displays the ID number of the Inode file-rw-r--.File type (-File d directory | Soft link (shortcut))rw-r--RU owner G Holder O OtherR Read W write X

character must appear as the first word\> front character must appear as a suffix\d Digital Match\d non-digit matching\s white space character matching\s non-whitespace character matching\{m,n\} \ is used to escape, prevents {} from being parsed by bash , matches the preceding character at least M times, up to N times , \{1,\} represents at least once, up to no limit. Operator Precedence\ Escape Character[] square brackets Expression() grouping*,+,? ,{m},{m,},{m,n} QualifierNormal characters f

and the table;(3) from the efficiency of execution,drop>truncate>delete;(4) When the table is truncate, the space occupied by the table and index reverts to the initial size, and the delete operation does not reduce the space occupied by the table or index. The drop statement frees all the space occupied by the table.30, SQL statement optimization. (It's a bit different from the previous issue)A: (1) Try to avoid using the non-equal (! = or (2) You should try to avoid null values for the field

query time, resulting in slower efficiency. The workaround is to use the index for sorting. If the order required for the query is the same as the sort used by the index, because the indexes are sorted, and therefore the results are returned in sequential read by index, the using Filesort does not appear at this time.As for the difference between using index and using index condition, I refer to an article on StackOverflowHttp://stackoverflow.com/questions/1687548/mysql-explain-using-index-vs-u

the query, and Usingfilesort will appear. Sorting naturally increases query time, resulting in slower efficiency. The workaround is to use the index for sorting. If the order required for the query is the same as the sort used by the index, because the indexes are sorted, and therefore the results are returned in sequential read by index, the using Filesort does not appear at this time. As for the difference between using index and using index condition, I refer to an article on StackOverflow H

and rename ABC; If ABC is a directory, move the file to the ABC directoryEG2: [Email protected] tmp]# mv/tmp/hello//VAR/TMP/ABCIf ABC exists and is a directory, it is to move the Hello directory to the ABC directory, if ABC does not exist, it is to move the Hello directory to/var/tmp and renamed to ABCInstall: Copying files and Setting properties-D direcotry ... : Creating a DirectorySRC DEST can only copy files-M can specify permissionsInstall-t DIRECTORY SRC ...This article is from the "Saili

=" Wkiom1y470ktgsudaamxqyewpla886.jpg "/>650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/75/6D/wKioL1Y474CRdi6LAAMKJ7RWS-A028.jpg "style=" float: none; "title=" 6.png "alt=" Wkiol1y474crdi6laamkj7rws-a028.jpg "/>The forward scheduler still uses nginx scheduling: The configuration file and the previous unchanged. test: Input in the browser can be seen regardless of how the dispatch, the information returned is the information returned by the memcached node. 650) this.width=650; "src="

1. Inherit thread　　 Public class extends thread{ publicvoid run () { System.out.println () {Thread.CurrentThread (). GetName ()); } Public Static void Main (string[] args) { new testthread (); T.start (); }}2. Implement Runnable Public class Implements runnable{ @Override publicvoid run () { System.out.println ( Thread.CurrentThread (). GetName ()); } Public Static void Main (string[] args) { new Thread (new testrunna

For example, click the menu Popup Non-modal dialog box .Step1Resource View Add dialog box template . Renaming a dialog box resource ID.Step2Check the dialog box , Right-click menu to add Class .Step3In the message handling function of the menu itemCdialogaddcontactdlg;INT_PTR Nresponse =dlg. DoModal ();if (Nresponse ==idok){}else if (nresponse== IDCANCEL){} can be domodel Create modal dialog box through create Create modeless dialog box Explains the two types of dialog boxes dialo

About the dress up system is basically the first three articles said that, here to say some trivial.1. In online games, it is recommended to pack each part into a assetbundle, such as a male role, to put his basic skeleton into a bag, and then pack the models of each part of the body separately. If a model consists of five parts of the head, face, body, arm, and foot, then the package will have six resource packs, namely the base skeleton, heads, face, body, arms, and feet.2. What to look for wh

1. What is recursion: recursion is higher than iteration;Calling yourself in a recursive function, such as Next, will fall into a dead loop:def recursion (): return recursion ()Tip: Python3 The recursive layer depth is 100 layers, you can change the recursive layer depthImport SysSys.setrecursionlimit (10000)To implement factorial in a non-recursive way:def factorail (n): result = N Range (1,n): Result *= I return resultPrint (Factorail (5))Results: 120To implement factorial i

Say you has an array for which the i-th element is the price of a given-stock on day I.Design an algorithm to find the maximum profit. Transactions at the most K .Note:Engage in multiple transactions on the same time (ie, you must sell the stock before you buy again).Credits:Special thanks to @Freezen for adding this problem and creating all test cases.Based on Dynamic PlanningMaintain II vectors:gpro:to Day I the maximum profit lpro:to Day I, the maximum profit with jth sell by day IThe complex