原创博文:转载请标明出处(周学伟):http://www.cnblogs.com/zxouxuewei/tag/ Introduction 此示例帮助您使用turtlebot的自主性. 驱动机器人向前移动并且当存在障碍物时改变其方向. 您将订阅激光扫描主题并发布速度主题以控制turtlebot. Hardware Support Package for turtlebot 本示例使用ROS接口的TurtleBot. 基于TurtleBot的机器人支持包为TurtleBot提供了一个更简洁的界面.…

Scripted AI and Scripting Engines 脚本AI与脚本引擎 This chapter discusses some of the techniques you can use to apply a scripting system to the problem of game AI, and the benefits you can reap from doing this. At its most basic level, you can think of scri…

A material that you may never have heard of could be paving the way for a new electronic revolution. By KRISTIN ROBERTS Researchers from universities in China and Canada working at the National MagLab are exploring the exciting properties of phosphor…

概要 本章对“公平锁”的获取锁机制进行介绍(本文的公平锁指的是互斥锁的公平锁),内容包括:基本概念ReentrantLock数据结构参考代码获取公平锁(基于JDK1.7.0_40)一. tryAcquire()二. addWaiter()三. acquireQueued()四. selfInterrupt()“公平锁”的释放锁的机制在后面一章再做介绍,锁的使用示例请参考“Java多线程系列--“JUC锁”02之 互斥锁ReentrantLock”. 转载请注明出处:http://www.cnbl…

概要 前面一章,我们学习了“公平锁”获取锁的详细流程:这里,我们再来看看“公平锁”释放锁的过程.内容包括:参考代码释放公平锁(基于JDK1.7.0_40) “公平锁”的获取过程请参考“Java多线程系列--“JUC锁”03之 公平锁(一)”,锁的使用示例请参考“Java多线程系列--“JUC锁”02之 互斥锁ReentrantLock”. 注意:(01) 这里是以“公平锁”来进行说明.(02) 关于本章的术语,如“AQS”,“CAS函数”,“CLH队列”,“公平锁”,“非公平锁”,“独占锁”,“…

概要 前面两章分析了"公平锁的获取和释放机制",这一章开始对“非公平锁”的获取锁/释放锁的过程进行分析.内容包括:参考代码获取非公平锁(基于JDK1.7.0_40)释放非公平锁(基于JDK1.7.0_40)关于锁的数据结构请参考"Java多线程系列--“JUC锁”03之 公平锁(一) ",锁的使用示例请参考“Java多线程系列--“JUC锁”02之 互斥锁ReentrantLock”. 转载请注明出处:http://www.cnblogs.com/skywang12…

下文的第一个逐行读取文件例子用三种方式实现;普通方法,迭代器和生成器,比较了他们的优缺点,很好,可以引用到自己的代码中 ,支持的php版本(PHP 5 >= 5.5.0) 后面的yield讲解,得逐行翻译理解 Request for Comments: Generators Date: 2012-06-05 Author: Nikita Popov nikic@php.net Status: Implemented Introduction Generators provide an easy,…

android上的view的类叫View, 以下是它的class overview, This class represents the basic building block for user interface components. A View occupies a rectangular area on the screen and is responsible for drawing and event handling. View is the base class for wi…

lua weak table 经常看到lua表中有 weak table的用法, 例如: weak_table = setmetatable({}, {__mode="v"}) 官网上的解释: http://www.lua.org/pil/17.html Weak tables are the mechanism that you use to tell Lua that a reference should not prevent the reclamation of an obje…

Current state of affairs SSL support was added in version 4.2 (SolrCloud v4.7). Protection of Zookeeper content through ACLs was added in version 5.0 Authentication and Authorization plugin support was added in 5.2 (SolrCloud only) Basic Auth & Kerbe…