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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...ens often, then multiple locks would increase parallelism. At the cost of maintainability, since more locking means more debugging of the locking.
How efficient is it to lock a mutex? I.e. how much assembler instructions are there likely and how much time do they take (in the case that the mutex...
What's the difference between utf8_general_ci and utf8_unicode_ci?
..., utf8 is a flawed UTF-8 implementation from early MySQL versions which remains only for backward compatibility. The fixed version was given the name utf8mb4.
Note: Newer versions of MySQL have updated Unicode sorting rules, available under names such as utf8mb4_0900_ai_ci for equivalent rules based...
Algorithm to compare two images
...the copy may do stuff like rotating, making negative, or adding trivial details (as well as changing the dimension of the image).
...
Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...正则表达式
< <= > >= != ==
关系运算符
空格
连接
+ -
加，减
* / &
乘，除与求余
+ - !
一元加，减和逻辑非
^ ***
求幂
++ --
增加或减少，作为前缀或后缀
$
字段引用
in
...
How to convert number to words in java
..." ");
}
/**
* testing
* @param args
*/
public static void main(String[] args) {
System.out.println("*** " + EnglishNumberToWords.convert(0));
System.out.println("*** " + EnglishNumberToWords.convert(1));
System.out.println("*** " + EnglishNumberToWords.convert(16));
S...
Bomb dropping algorithm
...g layer 1, because the
"blast radius" you get from doing so is always contained within the blast radius of
another square from layer 2. You should be able to easily convince yourself of this.
So, we can reduce the problem to finding an optimal way to bomb away the perimeter, then we can repeat t...
Oracle 11.2.0.4 RAC FOR redhat 6.4 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...看一下状态
安装ORACLE
安装GRID
连接VNC 开始安装GRID 开一个终端 允许 xhost +进入/mnt/iso/oralce/grid 运行安装程序
解决中文乱码
网上下载zysong这个字体
创建自己的字体文件夹
mkdir -p /usr/share/fonts/zh_CN/T...
Get MIME type from filename extension
...emoved, so you should be extra cautious and add double checks and provide fail safe action for every step.
MimeMapping._mappingDictionary.AddMapping(string fileExtension, string mimeType)
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What is a correct mime type for docx, pptx etc?
...show.macroEnabled.12
.mdb application/vnd.ms-access
For further details check out this TechNet article and this blog post.
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Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...值是“src/foo src/bar”。
$(join <list1>,<list2> )
名称：连接函数——join。
功能：把<list2>中的单词对应地加到<list1>的单词后面。如果<list1>的单词个数要比<
list2>的多，那么，<list1>中的多出来的单词将保持原样。如果<list2>...