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select、poll、epoll之间的区别总结[整理] - C/C++ - 清泛网 - 专注C/C++及内核技术

...般是读就绪或者写就绪),能够通知程序进行相应的读写操作。但select,poll,epoll本质上都是同步I/O,因为他们都需要在读写事件就绪后自己负责进行读写,也就是说这个读写过程是阻塞的,而异步I/O则无需自己负责进行读写,...
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BSS段、数据段、代码段、堆与栈 剖析 - C/C++ - 清泛网 - 专注C/C++及内核技术

...栈上分配空间。.bss 是不占用.exe 文件空间的,其内容由操作系统初始化(清零);而.data 却需要占用,其内容由程序初始化,因此造成了上述情况。 【例二】 编译如下程序(test.cpp): #include <stdio.h> #define LEN 1002000 int in...
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How to fix “ImportError: No module named …” error in Python?

... 123 Python does not add the current directory to sys.path, but rather the directory that the scrip...
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重构理论及实践——用工厂模式重构c++后台代码 - C/C++ - 清泛网 - 专注C/C...

...使软件的性能优化更容易。除了对性能有严格要求的实时系统,其他任何情况下”编写快速软件“的秘密就是:首先写出可调的软件,然后调整它以求获得足够速度。 这段摘自书中的言语多少有些暧昧。其实再大胆一些说,...
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What is the reason for having '//' in Python? [duplicate]

...edited Feb 20 '15 at 6:52 Rizier123 55k1616 gold badges7777 silver badges119119 bronze badges answered Feb 20 '15 at 6:35 ...
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C# Double - ToString() formatting with two decimal places but no rounding

... I suggest you truncate first, and then format: double a = 123.4567; double aTruncated = Math.Truncate(a * 100) / 100; CultureInfo ci = new CultureInfo("de-DE"); string s = string.Format(ci, "{0:0.00}%", aTruncated); Use the constant 100 for 2 digits truncate; use a 1 followed by a...
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NoSQL Use Case Scenarios or WHEN to use NoSQL [closed]

... AdaTheDevAdaTheDev 123k2424 gold badges179179 silver badges181181 bronze badges ...
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思维导图在快速阅读或是其它学习工作中的作用 - 创意 - 清泛网 - 专注C/C++...

...键知识点之间的连接线会引导您进行积极主动思考。快速系统的整合知识,可以为您的知识融会贯通创造了极其有利的条件。发展创造性思维和创新能力。发散思维是创新思维的核心。画思维导图的方法恰恰是发散思维的具体化...
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In MySQL, how to copy the content of one table to another table within the same database?

...edited Feb 20 '15 at 7:23 Rizier123 55k1616 gold badges7777 silver badges
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How to escape double quotes in a title attribute

...#064 | at sign @ &amp;#093 | right bracket ] &amp;#123 | left curly brace { &amp;#125 | right curly brace } &amp;#133 | ellipsis … &amp;#135 | double dagger ‡ &amp;#146 | right single quote ’ &amp;#148 ...