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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...
MQTT物联网协议完全实践指南 · App Inventor 2 中文网
... 各版本对比 App上架指南 入门必读 IoT专题 AI2拓展 Aia Store 关于 关于我们 发布日志 服务条款 搜索 ...
cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术
...0003h
cpuid
......
mov eax, 80000004h
cpuid
每次调用CPUID分别在EAX、EBX、ECX、EDX中返回16个ASCII字符，处理器名称/商标字串最多48个字符，前导字符为空格，结束字符为 NULL，在寄存器中的排列顺序为little-endian（即低字符...
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).
...
STL 算法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...each(InIt first, InIt last, Fun f);
generate
<algorithm>
连续调用输入的函数来填充指定的范围
函数原形
template<class FwdIt, class Gen> void generate(FwdIt first, FwdIt last, Gen g);
generate_n
<algorithm>
与generate函数类似，填充从指定...
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...
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)
share
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REDHAT 6.4 X64下ORACLE 11GR2静默安装 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...一个终端
第四无提示建库
1、建库的两种方式
1、调用DBCA指令图像化界面建库
2、直接以命令模式运行dbCA建库 （静默模式）
装之前使用
dbca –help 查看一下帮助信息
安装示例
dbac –silent createDatabase
-templa...