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The mutex embodies a kind of competition, I leave, inform you to come in. Cond embodies a kind of collaboration, I am ready to inform you to start. One obvious disadvantage of a mutex is that it has only two states: locked and unlocked. The condition variable, which compensates for the lack of a mutex by allowing the thread to block and wait for another thread to send the signal, is often used in conjunction with the mutex. When

Description1. Version used here: Springfox-swagger2 (2.4) Springfox-swagger-ui (2.4)2. Here is a description of the meaning and basic usage of common annotations (that is, the integration of swagger has been completed)Not integrated SeeSpringboot Integrated Springfox-swagger2 Build restful APISPRINGMVC Integrated Springfox-swagger2 Build restful APIWebsite WikiCommon notes:-@Api () for class;Represents a resource that identifies this class as a swagge

$ view become very large when there is a busy system activity, only a subset of the sessions are sampled and written to disk. By capturing only active sessions, Then only the associated set of data for the session being executed is generated, not the data for all sessions in the system. Using Ash allows you to v$active_session_history the current data and dba_hist_active_sess_ in the view Historical data in the history view for inspection and performance analysis, It is often possible to avoid t

,int *sign) Converts the floating-point value to a string and returns the stringChar *fcvt (double value,int ndigit,int *decpt,int *sign) Converts the floating-point value to a string and returns the stringChar *gcvt (double value,int Ndigit,char *buf) Converts the number of value to a string coexisting in BUF and returns a pointer to BUFChar *ultoa (unsigned long value,char *string,int radix) converts the unsigned integer value to a string and returns the string, radix is the base

Was asked in an interview the use of four kinds of smart pointers in STL Because of lack of experience, I only know auto_ptr and shared_ptr, and then said a weak ... Then the interviewer's cue was weak_ptr, and then he took the initiative to say Unique_ptr I only did a bit of use for auto_ptr and shared_ptr. Now in retrospect, the interview is still very dissatisfied with their own knowledge is also very dissatisfied, the recent work is not very busy, specifically to sum up the four kinds of sma

, characteristics and technical characteristics of history. ASCII Character Set 1. The origin of the name ASCII (American Standard Code for Information Interchange, American Information Interchange standard codes) is a computer coding system based on the Roman alphabet. 2. Features It is mainly used to display modern English and other Western European languages. It is the most common single byte coding system today and is equivalent to ISO 646.

Text Variable length, up to 65,535 characters Mediumtext Variable length, up to 2 of 24 square-1 characters Longtext Variable length, up to 2 of 32 square-1 characters The 1.char (n) and varchar (n) brackets mean the number of characters, not the number of bytes, so when Chinese is used (UTF8) means you can insert M Chinese, but it actually consumes m*3 bytes.2. At the same time c

99.999; Insert 123.456, the last query result is 99.999; Insert 12.34567, the last query result is 12.346; Therefore, in the use of floating-point type, but also to pay attention to the trap, to insert the actual results in the database will prevail.String data type MySQL data type Meaning CHAR (n) Fixed length, up to 255 characters VARCHAR (n) Variable length, up to 65,535 characters Tinytext Variabl

to how the engine executes the given re, and how to write the re in a specific way to make the bytecode run faster. This article does not involve optimization because it requires that you have a good grasp of the internal mechanism of the matching engine.Regular expression languages are relatively small and limited (limited functionality), so not all string processing can be done with regular expressions. Of course, some tasks can be done with regular expressions, but the final expression becom

files are open.4. Ctrl+2,l: Assigning a value to a local variableDuring development, I often write methods, such as calendar.getinstance (), and then assign the results of a method to a local variable by ctrl+2 shortcut keys. This saves me the input class name, the variable name, and the time the declaration was imported. The ctrl+f effect is similar, but the effect is to assign the result of the method to a field in the class.5. Alt+shift+r: RenamingRenaming properties and methods was a hassle

Description of parameters used by EhcacheParameter description in 1.ehcache.xmlEhcache.xml file:Parameter description:: When the number of objects in the memory cache exceeds maxelementsinmemory, the cache object is written to the disk cache (requires the object to implement the serialization interface).: Used to configure the physical path used by the disk cache

C, C + +, Java, JavaScript, PHP, Python, Ruby are these languages used primarily to develop what?Pansz,Welcome CommentsThis paste pure science use, the following is only the main use, other uses limited to the length of the relationship omitted, do not go into the dead.C: System bottom, driver, embedded bottom, basic service program.C + +: Upper service program, Application API, large 3D game.Java: Server-side applications, and client applications.JS:

The break statement is used to jump out of a loop.The Continue is used to skip an iteration in the loop.Break statementWe have seen the break statement. It is used to jump out of a switch () statement.The break statement can be used to jump out of a loop.After the break statement jumps out of the loop, the code after t

Design patterns can help users abstract details at a higher level and better understand the architecture. If you are familiar with the GoF design pattern and the JavaServer Faces (JSF) framework, this article can help you gain insight into the design patterns used in the JSF framework and understand how they work. This article explores the design patterns used in the JSF framework. The design patterns disc

calendar.getinstance (), and then assign the results of a method to a local variable by ctrl+2 shortcut keys. This saves me the input class name, the variable name, and the time the declaration was imported. The ctrl+f effect is similar, but the effect is to assign the result of the method to a field in the class.5. Alt+shift+r: RenamingRenaming properties and methods was a hassle a few years ago, requiring a lot of searching and replacing so that the code became fragmented. Today's Java IDE pr

Original blog. Reprint please indicate the sourceAttach several Linux blogs with a high number of previous visitsMy 8 tips for using the shellGREP's nine classic usage scenariosSED command specific explanationThe awk command specifically explainsEverything in Linux is a file, and the command is a binary file.1, LS/bin/lsFrequently used options-A All files (including hidden files)-L Specific Information-D folder Properties-I view InodeExample[Email pro

. The Static descriptor is used to create class methods and variables. The final descriptor is used to finalize and implement classes, methods, and variables. Abstract descriptors are used to create classes and methods that are not allowed to be instantiated. The synchronized and volatile descriptors are used