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the case of fierce competition. (In other words, when many threads want to access shared resources, JVM can spend less time scheduling threads and spend more time on execution threads .) What does the reentrant lock mean? To put it simply, there is a lock-related acquisition counter. If a thread that owns the lock gets the lock again, it will add 1 to the acquisition counter, then the lock must be released twice before it can be truly released. This

: # Include Execution result Zookeeper tests show that the introduction of the mutex object can solve the problem of resource synchronization between threads. The following questions about mutex objects need to be explained. Release of mutex objectsIf the main hMutex=CreateMutex(NULL,TRUE,NULL); Zookeeper sub-thread: While (TRUE) {ReleaseMutex (hMutex); // invalid // wait for the signal of the mutex object. INFINITE indicates that it has been waiting and future code is protected b

commands to change the shell environment of a user: The chsh system user name, and enter the new shell path as prompted, such as/bin/bash.5. view the environment variables and ID of the current user, set | grep user, set | grep uid or, and view the/etc/passwd file.6. Check the location of a command. For example, which ifconfig. Some commands in some common users cannot be found.Or when the command is executed, it is generally because the path of the command is not added to the environment varia

In the previous article, Mutex is an exclusive lock. Only one thread can own the lock, and it is the same thread immediately. If a Mutex is already held, it will still block the attempt to obtain the lock again. Sometimes we need to lock the same thread as the Java synchronized to re-enter, as long as it already has the lock, instead of blocking it. We can transform the implementation of Mutex in the previous article to implement a reentrant lock-ReentrantLock. This requires ReentrantLock to rec

with the samba user. Note: samba users are transformed from system users. To generate a user as a samba user, this user must already be a system userShare Without PasswordServer use verification server VerificationDomain Controller Verification* ********** When using server, domain needs to be set up in addition, not to mention, samba is mainly used for file sharing, and the two do not need to be ***** Share definitions sharing settings [Home] shared directory nameComment = directory descriptio

Personal unity_demo design ideas and journey, unity_demo design ideas It may take some time to learn about Unity. Prepare a demo to try it out. The design idea is to design a small game that owns the Battle System, weapon system, and shop system according to the mmorpg game model. The following is a UML diagram of the project code: Combat System: After a base class Icharactor is set up, the common interaction between the protagonist and the enemy

translatedWm_syscommand = $0112//The window receives this message when the user chooses a command on the Window menu or when the user chooses to maximize or minimizewm_timer= $0113//Timer event occurredWm_hscroll= $0114//When a window standard horizontal scrollbar produces a scrolling event, this message is sent to that window and also to the control that owns itWm_vscroll= $0115//When a window standard vertical scrollbar produces a scrolling event w

Const wm_keylast = H108Public Const Wm_initdialog = H110 ' sends this message to it before a dialog box is displayed, typically using this message to initialize the control and perform other tasksPublic Const wm_command = H111 ' When the user selects a menu command item or when a control sends a message to its parent window, a shortcut key is translatedPublic Const Wm_syscommand = H112 ' When the user chooses a command from the Window menu or when the user chooses to maximize or minimize, that

translated by the TranslateMessage function, the message is submitted to the window that has the focusWm_sysdeadchar = $0107;Send this message to the window with focus when the Wm_syskeydown message is translated by the TranslateMessage functionWm_keylast = $0108;Wm_initdialog = $0110;Sends this message to a dialog box before it is displayed, typically using this message to initialize the control and perform other tasksWm_command = $0111;When a user selects a menu command item or when a control

swp_showwindow display the form. Call this member function to change the size, position, and Z-order of the subform, pop-up form, and top-level form.Forms are sorted on the screen according to their z-axis order. The form at the top of the z-order is the program at the top of all other forms.All the coordinates of the subform are customer coordinates (relative to the upper-left corner of the parent form's client area). The form can be moved to the top of the z-axis order, either by setti

[Java]View PlainCopy @property (nonatomic, assign) Iboutlet Uitextfield *namefield; 1. If the user enters the MJ string in the text boxThen it can be said that the text property of the Namefield is a pointer to the NSString object, which is the owner, which holds the contents of the Text input box2. If the following code is executed[Java]View PlainCopy NSString *name = Self.nameField.text; An object can have multiple owners, and in the code above, the name variable i

is the use of RSA encryption system2. The user has a public key published by the server3. Server Retention Key4. The server sends the plaintext to the user with ciphertext encrypted with the key5. The user decrypts the received ciphertext by using the public key published by the server and compares the received plaintext to prove that the server is holding the private key and that it is the server that owns the public key.6. Guarantee Principle:Priva

Http://www.cnblogs.com/LeoTang/p/3344265.htmlDynamics CRM 2011 Rights ManagementThe role-based permissions of CRM system are mainly controlled by departments, roles, users and teams . The owner of each entity record (owner) must be a certain user or team. A user or team must belong to one and belong to only one department, but the members of the team can come from different departments. Users and teams can have several different roles, and the roles assigned to the user or team are associated wi

------: In addition to the full permissions of the directory owner, other users have no permissions on the directory at all. Examples are as follows:Each user has its own directory, which is usually placed under/home [Email protected] home]# ll/home/ Total dosage 0 DRWX------. 3 Mk Mk 78 September MK NOTE: [rwx------] indicates that the directory owner owns the permissions that other users cannot access. Root can. Exampl

matching element. AppendTo () appends content to the matching element. attr () Sets or returns the attributes and values of the matching element. The before () inserts the content before each matching element. Clone () creates a copy of the matching element collection. Detach () removes a collection of matching elements from the DOM. Empty () deletes all the child nodes in the matching element collection. Hasclass () checks whether the matching element

controller actions.This controller provides a way for you to reuse the code of the action method, which can be used in multiple controllers or in different projects.Derived classes must implement a method named Run (), which is called when the controller is requested.For example: the run () invocation declaration is as follows: Public function run ($id, $type = ' book ') {} and provides the arguments for the operation [' ID ' =>1];So when run (1), the parameter is 1, the run () is called automa

PondsTime limit:1500/1000 MS (java/others) Memory limit:131072/131072 K (java/others)Total submission (s): 3851 Accepted Submission (s): 582Problem Descriptionbetty owns a lot of ponds, some of them is connected with other ponds by pipes, and there would not be More than one pipe between and ponds. Each pond have a valuev.Now Betty wants to remove some ponds because she does not having enough money. But each time if she removes a pond, she can only re

PondsTime limit:1500/1000 MS (java/others) Memory limit:131072/131072 K (java/others)Total submission (s): 282 Accepted Submission (s): 86Problem Descriptionbetty owns a lot of ponds, some of them is connected with other ponds by pipes, and there would not be More than one pipe between and ponds. Each pond have a valuev.Now Betty wants to remove some ponds because she does not having enough money. But each time if she removes a pond, she can only remo

basically guarantees that all SMTP traffic will only go from the CAS when leaving the current Exchange organization.Transfer Service (the Transport services)The transport service in Ex2013 is responsible for most of the functions of the Hub Transport roles of the previous Ex2007 and 2010, and then adds some new improvements to this foundation. such as DLP, such as archiving, such as transmission rules.The transport service maintains a queue for each internal Exchange mailbox database, and the D

Specifically, there are several different levels of code modification.At the bottom of the layer tree hardware synthesis acceleration part of the modification, at this level you can do is to let a layer display up or down, and the page's JS code does not know this at all, but note that page interaction depends on the hittest role in this layer, One of the topmost Renderlayer objects is first hittest tested. So you have to make sure that the original HitTest logic is not affected, and the idea is