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key of the thing is legal. The most important of these algorithms is that their security depends on key, which generally depends on the length of the key. In other words, it is very difficult to solve the problem of knowing the algorithm without knowing the key. In fact, the commonly used key-based encryption algorithm can be found on the network. Key-based encryption algorithms also include two classes: symmetric and asymmetric encryption. Symmetric encryption refers to the use of identical ke

Threads. The lock class provides locks to guarantee mutual exclusion.Executing Lock.acquire () and Lock.release () at both ends of the critical code area guarantees that only one thread accesses the critical code area , and the condition variable is built on top of the lock, by threads. Condition implementation, which is used to ensure synchronization of the tool. Each condition variable has a lock variable (the lock variable can also be performed acquire and release operations, and multiple con

kademlia_req and kademlia_res. (The two message codes are used to update the route table) The next step is to publish or search the content. This can be better understood by combining the analysis of the cindexed class. EMule stores three types of information in the kademlia Network: file source, keyword information, and file comments. The file source corresponds to each specific file, and each file usesIts content Hash ValueAs the unique identifier of the file,A file source information is such

translatedWm_syscommand =$ 0112;This message is received when you select a command in the window menu or when you choose to maximize or minimize it.Wm_timer = $0113; // a timer event occurs.Wm_hscroll = $0114;When a standard horizontal scroll bar of a window generates a rolling event, this message is sent to that window and the control that owns it.Wm_vscroll = $0115;When a standard vertical scroll bar of a window generates a rolling event, send this

you select a menu command item or when a control sends a message to its parent window, a shortcut key is translatedWm_syscommand =$ 0112;This message is received when you select a command in the window menu or when you choose to maximize or minimize it.Wm_timer = $0113; // a timer event occurs.Wm_hscroll = $0114;When a standard horizontal scroll bar of a window generates a rolling event, this message is sent to that window and the control that owns i

and press the Alt key, submit the message to the window with focusWm_syschar = $0106; when the wm_syskeydown message is translated by the translatemessage function, submit the message to the window with focusWm_sysdeadchar = $0107; when the wm_syskeydown message is translated by the translatemessage function, this message is sent to the window with focusWm_keylast =$ 0108;Wm_initdialog = $0110; send this message to a dialog box program before it is displayed. This message is usually used to ini

throughsynchronizedMethods.(An important exception:finalFields, which cannot be modified after the object is constructed, can be safely read through non-synchronized methods, once the object is constructed) This strategy is valid tive, but can present problemsLiveness, as we'll see later in this lesson. Intrinsic locks and synchronizationsynchronization is built around an internal entity known as Intrinsic lockOr Monitor lock. (The API specification often refers to this entity simply as a "mon

schedule the thread and spend more time on the execution thread .)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 imitates synchronized semantics. If a thread enters the synchronized block protected by the monitor that the thread alrea

deposit bank have? Which one is better than burning cakes with soaring prices? Even everyone agrees that the market is in short supply. Can I buy a pancake futures? So a warrant ...... Someone asked: Will I never lose money when I buy a pancake? It looks like yes. But this world is so strange, suddenly the market came up with a plum called Plum, plum said: there is a loss of money! Which day will everyone lose money? Suppose 1: There is a price department in the market, and he thinks that the p

the access to the code segment by locking and unlocking the specified object. Monitor. Enter, monitor. tryenter, and monitor. Exit are used to lock and unlock a specified object. Once the lock of the specified object (code segment) is obtained (the monitor. Enter is called), other threads cannot obtain the lock. For example, thread x obtains an object lock, which can be released (Call monitor. Exit (object) or monitor. Wait ). When this object lock is released, the monitor. Pulse method and the

There are many online users.ArticleIt refers to row-to-column conversion, but most of them are directly pasted.CodeWhile ignoring the intermediate process, I thought about why it was implemented and made the following notes, which may be of no value to some people who understand it, I hope it will be helpful to those who do not understand it. For some businesses, the storage of data in the table and its final grid performance are exactly the same as reversing the source table. At this time, we

implementation: Id OBJ=[[NsobjectAlloc]Init]; Void*P=OBJ; [(ID)P retain]; An actual example can be used to verify whether the object ownership is held. Void*P=0; { Id OBJ=[[NsobjectAlloc]Init]; P=(_ Bridge_retainedVoid*)OBJ; } Nslog(@"Class = % @",[(_ Bridge ID)PClass]); After the braces are defined, P still points to a valid entity. It indicates that he owns the object. The object is not destroyed b

tasks.Wm_command when you select a menu command item or when a control sends a message to its parent window, a shortcut key is translatedWm_syscommandTo or when the user chooses to maximize or minimize the number of messages received in that windowA timer event occurs in wm_timer.Wm_hscroll: when a standard horizontal scroll bar of a window generates a rolling event, this message is sent to that window and the control that owns it.Wm_vscroll: when a

by dwmilliseconds until the object specified by the hhandle parameter enters the signal sending State. A mutex object is no longer When a thread has a signal, it enters the sending status. When a process is terminated, it enters the sending status. The dwmilliseconds parameter can be set to 0, which means only the hhandle parameter is checked. Specifies whether the object is in the sending status, and then returns immediately. The dwmilliseconds parameter is set to infinite, indicating that

In my opinion, there are two big things in Javascript's world-closure and prototype. Question 1.What does prototype do in JavaScript? In a single word, it's a feature that aimed at startup cing code duplication.We all know in computer world there is a famous philosophy-Don't repeat yourself.In classic object-oriented versions ages such as C ++/C #/Java, We have inheritance to encapsulate some common methods into a super class to reduce code lines.But in Javascript, there is no concept of class,

owns it. Wm_vscroll = $0115; When a standard vertical scroll bar of a window generates a rolling event, send this message to that window, and send it to the control wm_initmenu that owns it = $0116; This message is sent when a menu is to be activated. It occurs in a user menu bar or presses a menu key, which allows the program to change the menu before display. Wm_initmenupopup =$ 0117; This message is sen

translated by the translatemessage function, submit the message to the window with focusWm_sysdeadchar =$ 0107;When the wm_syskeydown message is translated by the translatemessage function, this message is sent to the window with focusWm_keylast =$ 0108;Wm_initdialog =$ 0110;Send this message to a dialog box program before it is displayed. This message is usually used to initialize the control and execute other tasks.Wm_command =$ 0111;When you select a menu command item or when a control sends

and press the Alt key, submit the message to the window with focusWm_syschar = $0106; when the wm_syskeydown message is translated by the translatemessage function, submit the message to the window with focusWm_sysdeadchar = $0107; when the wm_syskeydown message is translated by the translatemessage function, this message is sent to the window with focusWm_keylast =$ 0108;Wm_initdialog = $0110; send this message to a dialog box program before it is displayed. This message is usually used to ini

; } Nslog (@ "class = % @", [(_ bridge ID) P class]); After the braces are defined, P still points to a valid entity. It indicates that he owns the object. The object is not destroyed because of its defined range. _ Bridge_transfer Instead, you need to use the _ bridge_transfer keyword to release the variable that originally owns the object after type conversion. The text is a bit confusing. Let's take a l

specified object (code segment) is obtained (the monitor. Enter is called), other threads cannot obtain the lock. For example, thread x obtains an object lock, which can be released (Call monitor. Exit (object) or monitor. Wait ). When this object lock is released, the monitor. Pulse method and the monitor. pulseall method notify the next thread of the ready queue to perform the lock and all other threads in the ready queue to obtain the exclusive lock. Thread x releases the lock and thread y o