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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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Facebook Post Link Image

...> <meta property="og:image" content="http://www.test.com/img/fb-logo.png" /> <meta property="og:title" content="Prepaid Phone Cards, low rates for International calls with Lucky Prepay" /> <meta property="og:description" content="Cheap prepaid Phone Cards. Low rates for internation...
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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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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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Matplotlib - global legend and title aside subplots

...lots down: st.set_y(0.95) fig.subplots_adjust(top=0.85) fig.savefig("test.png") gives: share | improve this answer | follow | ...
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How to create a date and time picker in Android? [closed]

... looks ugly ;( static.pychat.org/photo/f1qRFo31_Screenshot_20170214-123713.png – deathangel908 Feb 14 '17 at 10:38  |  show 3 more comments ...
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Add a background image to shape in XML Android

...ize but is blurry, which I suspect is due to some kind of re-sizing of the PNG. Any suggestions? – Luke Allison Mar 3 '16 at 12:33 ...
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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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Should image size be defined in the img tag height/width attributes or in CSS? [duplicate]

...gt; Your HTML: &lt;img class="thumbnail" src="images/academia_vs_business.png" alt="" /&gt; In css/style.css: img.thumbnail { width: 75px; height: 75px; } If you'd like to use inline styles though, it's probably best to set the width and height using the style attribute for the sake of rea...
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How do I conditionally apply CSS styles in AngularJS?

...12px; border-radius: 12px; background-image: url(images/pdf_icon32.png); } share | improve this answer | follow | ...