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Http://www.ibm.com/developerworks/cn/linux/l-cn-awkf/ Wen Quan (saphires@sohu.com), software engineer, Jie Si Rui Technology (Beijing) Co., Ltd.
Introduction:This article introduces the global variable pollution in awk starting with two incorrect
From thisArticleAt the beginning, I will gradually introduce the basic architecture layer, domain layer, application layer, and distributed service layer of nlayerapp. This article focuses on the infrastructure layer. Based on the above analysis of
Software testing and supporting tools
(The author's time is unknown)
Introduction
Software testing, as a key technical means to ensure the quality and reliability of software, is becoming increasingly important. But how to conduct tests, how to
For beginners, the compilation of many commands is too complex, often learning for a long time can not write a beautiful program, so as to hinder our interest in learning compilation, many people give up. Therefore, I personally read the legal
If a person is a programmer and has no knowledge of memory, I can tell you that he must be boasting. Writing a program in C or C ++ requires more attention to the memory, not only because the reasonable memory allocation directly affects the
The thread is introduced to reduce the time-space overhead of the Program During Concurrent execution, so that the OS has better concurrency.Comparison between threads and processes1) SchedulingIn traditional operating systems, processes are the
◆ Overflow overwrites the virtual function pointer list in C ++ for executionCode
Author: watercloudHome: http://www.nsfocus.comDate: 2002-4-15
Directory:
1. Static and Dynamic Association of virtual functions in C ++2. Space Organization and
I have been paintingProgramIn the diagram of the function, I thought it was very simple at first. I found it cumbersome and complicated, and it was a great test of human perseverance, patience, and seriousness.
First, find the functions used in
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Program impossible Bit operations and practical skills (2): Advanced (1)Author: matrix67 Date: font size: Small Medium large ===== something really strong! =====
In binary, 1 has an odd or even number.We can use the
Therefore, I personally read the legal compilation, but I don't have to write a program. Writing a program is really not a compilation strength. You may wish to play DEBUG, sometimes CRACK has a more sense of accomplishment than a program (just like
PHP performance optimization (php. ini), performance optimization php. ini
Chapter 1 Optimization of excessive system callsMy Optimization Aimed at too many syscall calls, so I used strace to track apache for analysis.
1. apache2ctl-X &Use the-X
The concept of a signal
Signal (signal)--the way communication between processes is a software interrupt. Once a process receives a signal, it interrupts the original program execution process to process the signal.
Several common signals:
SIGINT
In the LIUNX system in order to execute a command every minute, the most common way is crontab, if you do not want to use Crontab, with colleagues in the program can use the timer to achieve this function, so began to grope, found that need some
What is asynchronous programmingWhat is asynchronous programming? To give a simple example:usingSystem.Net.Http;usingSystem.Threading.Tasks;using StaticSystem.Console;namespacecore{classAsync {Static voidMain () {Start (); End (); }
Article Title: Linux kernel analysis methods. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
Author: Yu
First, what is the state diagramPersonally, the process of running a program can be viewed from a certain angle as a process of transition between States. For example: The program is in the state of a, completed an action, can be sent, can be
Although Hdwiki is an open-source wiki system, and the code is simple and understandable, it requires a holistic understanding of the framework if you want to do further development on the system. Familiar with the Hdwiki framework can be completely
One way to "make something happen" is to evaluate an expression with a side effect. Injected assignments and function calls these expressions with side-effects can be used as separate statements, and this expression is also called an expression
The fifth chapter design of the selection structureThe first part:Summarize1 A program structure that uses different program segments to process a certain condition is called a selection structure.2 C-language selection statements include if and
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