原文在linux系统中,单处理器也是多线程处理信号、事件等。这就需要一个核心算法来进行进程调度。这个算法就是CFS(Completely Fair Scheduler)。在LInux Kernel Development一书中用一句话总结CFS进程调度:运行rbtree树中最左边叶子节点所代表的那个...
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系统相关 时间:
2015-04-01 17:28:48
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398
常见验证码的弱点与验证码识别验证码作为一种辅助安全手段在Web安全中有着特殊的地位,验证码安全和web应用中的众多漏洞相比似乎微不足道,但是千里之堤毁于蚁穴,有些时候如果能绕过验证码,则可以把手动变为自动,对于Web安全检测有很大的帮助。全自动区分计算机和人类的图灵测试(英语:Completely ...
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其他好文 时间:
2015-03-19 19:58:05
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224
本文主要介绍验证码的创建与检验验证码,涉及php图像处理等知识。验证码(CAPTCHA)是“Completely Automated Public Turing test to tell Computers and Humans Apart”(全自动区分计算机和人类的图灵测试)的缩写,是一种区分用户...
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Web程序 时间:
2015-02-06 20:14:36
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315
I am using java.util.zip to add some configuration resources into a jar file. when I call addFileToZip() method it overwrites the jar completely, inst...
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编程语言 时间:
2015-02-04 16:28:57
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163
1.服务端listen成功后,系统就自动接收客户端请求了
man listen:
其中有一段
The behavior of the backlog argument on TCP sockets changed with Linux
2.2. Now it specifies the queue length for completely establishe...
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其他好文 时间:
2015-01-29 19:36:53
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251
In order to reuse the Fragment UI components, you should build each as a completely self-contained, modular component that defines its own layout and behavior. Once you have defined these reusable Fra...
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其他好文 时间:
2014-12-26 09:45:18
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210
1.利用分析工具——叠加分析——“空间连接”工具,将完全包含(COMPLETELY_CONTAINS)某点的面的属性值赋为该点的属性值。其中定义用于匹配行的条件。匹配选项包括:相交—如果连接要素与目标要素相交,将匹配连接要素中相交的要素。这是默认设置。INTERSECT_3D— 如果连接要素中的要素...
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其他好文 时间:
2014-12-25 21:56:46
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481
Description
Lindsay is a shopaholic. Whenever there is a discount of the kind where you can buy three items and only pay for two, she goes completely mad and feels a need to buy all items in the st...
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其他好文 时间:
2014-12-09 21:31:27
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166
The software industry is constantly evolving. Many languages that were cutting edge just a few years ago either look outdated or have been made completely redundant today.
Today, new languages are emerging with surprising frequency to meet the changing ne...
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编程语言 时间:
2014-11-15 00:16:57
阅读次数:
246
Support for object orientation was completely new to PHP 4, and was therefore not very sophisticated in comparison to the OO support in other language...
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其他好文 时间:
2014-11-01 09:40:53
阅读次数:
137