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setter属性 (assign/retain/copy),
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<header>
<h1 class="entry-title"><a href="/blog/2013/03/31/ios-arc/">Ios Arc</a></h1>
<p class="meta">
<time datetime="2013-03-31T22:32:00+08:00" pubdate data-updated="true">Mar 31<span>st</span>, 2013</time>
</p>
</header>
<div class="entry-content"><h2>IOS ARC</h2>
<p>首先介绍一下object-c的属性</p>
<p>Property能够自动设置属性的访问器</p>
<p>属性分三类</p>
<ol>
<li>读写属性 (readwrite/readonly)</li>
<li>setter属性 (assign/retain/copy),</li>
<li>原子属性 （atomicity/nonatomic）</li>
</ol>
<p> <code>如果属性是对象类型，你需要使用retain,assign,copy参数，表示setter方法内部实现的时候，持有对象的方式。其中retain就是增加引用计数，强引用类型。assign就是变量的直接赋值，弱引用类型，也是默认值。copy就是把setter的参数复制一遍，再赋给成员变量。 如果你不给出持有对象的方式，编译器就会给出警告。
原子属性中，atomic是默认值，表示属性是原子的，支持多线程并发访问（在setter实现中加入了同步锁），后者是非原子的，适合在非多线程环境中提升效率，没有加入同步锁</code></p>
<p> <code>在ios5.1中新引入的strong和retain类似是强引用，weak和assign类似是若引用.</code></p>
<p> links:</p>
<ol>
<li><a href="http://blog.csdn.net/newjerryj/article/details/6257538">属性的介绍与使用</a></li>
<li><a href="http://blog.csdn.net/favormm/article/details/7023322"> iOS5 ARC学习笔记 </a></li>
</ol>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/03/29/fiber/">Fiber</a></h1>
<p class="meta">
<time datetime="2013-03-29T15:53:00+08:00" pubdate data-updated="true">Mar 29<span>th</span>, 2013</time>
</p>
</header>
<div class="entry-content"><p>纤程Fiber: 一个类似线程的协作任务，和线程不同的是纤程不能通过vm来调度，只能通过用户自己来调度。切换的代价很小。</p>
<figure class='code'><figcaption><span>[] (Fiber.rb)</span> <a href='/code/Fiber.rb'>download</a></figcaption>
<div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="c1">## fibonacci 计算，a1 = a2 = 1 ;an=a(n-1)+a(n-2)</span>
</span><span class='line'><span class="n">fib</span> <span class="o">=</span> <span class="no">Fiber</span><span class="o">.</span><span class="n">new</span> <span class="k">do</span>
</span><span class='line'> <span class="n">x</span><span class="p">,</span> <span class="n">y</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span>
</span><span class='line'> <span class="kp">loop</span> <span class="k">do</span>
</span><span class='line'> <span class="no">Fiber</span><span class="o">.</span><span class="n">yield</span> <span class="n">y</span> <span class="c1">## 返回 y 给 调用者</span>
</span><span class='line'> <span class="n">x</span><span class="p">,</span> <span class="n">y</span> <span class="o">=</span> <span class="n">y</span><span class="p">,</span> <span class="n">x</span> <span class="o">+</span> <span class="n">y</span> <span class="c1">## Fiber.yield 调用后阻塞，在resume之后执行</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'><span class="k">end</span>
</span><span class='line'><span class="mi">20</span><span class="o">.</span><span class="n">times</span> <span class="p">{</span> <span class="nb">puts</span> <span class="n">fib</span><span class="o">.</span><span class="n">resume</span> <span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
<p>从上面代码可以看出线程可以保存自己的上下文，并且可以像线程一样脱离当前线程独立存在.
当纤程里面的代码顺序执行执行完成之后纤程就终止了。
代码中fib每被调用一次(resume)就执行一次loop,因为是死循环所以纤程fib可以一直被调用。</p>
<p>协程Coroutines:
Ruby中新的纤程是半协程<a href="http://en.wikipedia.org/wiki/Coroutine">（semi- coroutines）</a>。
协程只是一个概念，其定义是“能挂起和唤醒的计算机程序子运行时”的计算机程序子运行时
半协程是不对称（asymmetric）协程，在它们对控制权传递的选择上收到限制。不对称协程只能将控制权传递回它们的调用者，而对于协程来说，只要它们有相应的句柄，它们就可以自由地将控制传递给其它的任何一个纤程。
wikipedia上说的很多都看不懂，我只看了协程在java和ruby中的实现，在java中主要和jvm有关系，一般的jvm都是用thread来实现的。Ruby则是纤程（那线程算不算…）。Lua就也是thread,只是底层实现各有不同。</p>
<p>Links:</p>
<p><a href="http://www.infoq.com/cn/news/2007/09/ruby-1-9-fibers">Ruby 1.9加入纤程实现轻量级并发</a></p>
<p><a href="http://timyang.net/lua/lua-coroutine/">Lua coroutine 不一样的多线程编程思路</a></p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/02/26/my-heart/">一点感悟</a></h1>
<p class="meta">
<time datetime="2013-02-26T22:50:00+08:00" pubdate data-updated="true">Feb 26<span>th</span>, 2013</time>
</p>
</header>
<div class="entry-content"><p>最近总觉得太累了，有太多的放不下。总有一些不大不小的事情能让我失去斗志，忽然发现其实我真的太脆弱。最近有条微博说，马云说的：男人的心是委屈撑大的。骑车去看我妈的路上我魂不守舍，因为今天上班的一些烦心事。人生十之八九都是烦心事，忽然觉得人之所以太难受是因为在乎的太多，所以要承担的太多。所以当你觉得无法承受的时候不妨丢下手中的包袱。活着就是最大的幸福，没什么过不去的坎。</p>
<p>开心是一天，不开心也是一天，何不开心过一天呢。从今以后，我要自由自在的生活，无论发生什么活着就是最大的幸福，没什么过不去的坎。</p>
<p>开心是一天，不开心也是一天，何不开心过一天呢。从今以后，我要自由自在的生活，无论发生什么。</p>
<p><img src="http://ww4.sinaimg.cn/mw690/54da4dbdjw1dz63fencr1j.jpg" width="500" height="600"></p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/01/30/lua-test/">Lua 初探</a></h1>
<p class="meta">
<time datetime="2013-01-30T20:41:00+08:00" pubdate data-updated="true">Jan 30<span>th</span>, 2013</time>
</p>
</header>
<div class="entry-content"><p><a href="http://baike.baidu.com/view/416116.htm">Lua</a> 一种嵌入式的脚本语言，多用于游戏开发中的动态更新。安装下载点<a href="http://www.lua.org/download.html">这里</a>。
先来一个hello world</p>
<figure class='code'> <div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='lua'><span class='line'><span class="nb">print</span><span class="p">(</span><span class="s1">'</span><span class="s">hello world'</span><span class="p">)</span>
</span></code></pre></td></tr></table></div></figure>
<p>very simple,那么来一段循环</p>
<figure class='code'> <div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class='lua'><span class='line'><span class="k">for</span> <span class="n">i</span> <span class="k">in</span> <span class="p">{</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">4</span><span class="p">,</span><span class="mi">5</span><span class="p">}</span> <span class="k">do</span>
</span><span class='line'> <span class="nb">print</span><span class="p">(</span><span class="n">i</span><span class="p">)</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<p>上面用到了lua中最强大的数据类型<a href="http://www.lua.org/manual/5.2/manual.html#3.4.8">table</a>,table可以构建链表、矩阵、队列、集合等数据结构。</p>
<p>比如队列：</p>
<figure class='code'> <div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class='lua'><span class='line'><span class="n">list</span> <span class="o">=</span> <span class="kc">nil</span>
</span><span class='line'><span class="n">list</span> <span class="o">=</span> <span class="p">{</span><span class="n">_next</span> <span class="o">=</span> <span class="n">list</span><span class="p">,</span> <span class="n">value</span> <span class="o">=</span> <span class="n">v</span><span class="p">}</span>
</span><span class='line'><span class="kd">local</span> <span class="n">head</span> <span class="o">=</span> <span class="n">list</span>
</span><span class='line'><span class="k">while</span> <span class="n">head</span> <span class="k">do</span>
</span><span class='line'> <span class="nb">print</span><span class="p">(</span><span class="n">head</span><span class="p">.</span><span class="n">value</span><span class="p">)</span>
</span><span class='line'> <span class="n">head</span> <span class="o">=</span> <span class="n">head</span><span class="p">.</span><span class="n">_next</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<p>集合：</p>
<figure class='code'> <div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
</pre></td><td class='code'><pre><code class='lua'><span class='line'><span class="k">function</span> <span class="nf">Set</span> <span class="p">(</span><span class="n">list</span><span class="p">)</span>
</span><span class='line'> <span class="kd">local</span> <span class="n">set</span> <span class="o">=</span> <span class="p">{}</span>
</span><span class='line'> <span class="k">for</span> <span class="n">_</span><span class="p">,</span> <span class="n">l</span> <span class="k">in</span> <span class="nb">ipairs</span><span class="p">(</span><span class="n">list</span><span class="p">)</span> <span class="k">do</span> <span class="n">set</span><span class="p">[</span><span class="n">l</span><span class="p">]</span> <span class="o">=</span> <span class="kc">true</span> <span class="k">end</span>
</span><span class='line'> <span class="k">return</span> <span class="n">set</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'><span class="n">set</span> <span class="o">=</span> <span class="n">Set</span><span class="p">({</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">4</span><span class="p">,</span><span class="mi">5</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">})</span>
</span><span class='line'><span class="k">for</span> <span class="n">el</span><span class="p">,</span><span class="n">_</span> <span class="k">in</span> <span class="nb">ipairs</span><span class="p">(</span><span class="n">set</span><span class="p">)</span> <span class="k">do</span>
</span><span class='line'> <span class="nb">print</span><span class="p">(</span><span class="n">el</span><span class="p">)</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<p>输出结果</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>1
</span><span class='line'>2
</span><span class='line'>3
</span><span class='line'>4
</span><span class='line'>5</span></code></pre></td></tr></table></div></figure>
<h5>从上面可以看出Lua不像其他语言有很多现成的函数，数据结构都需要自己写代码构建,这个是Lua作为嵌入式脚本语言的特性</h5>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/01/29/hell-world/">使用Octopress和github Pages搭建自己的博客</a></h1>
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<time datetime="2013-01-29T21:53:00+08:00" pubdate data-updated="true">Jan 29<span>th</span>, 2013</time>
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<div class="entry-content"><p>github是目前托管开源代码最流行的网站，不管你有没有发布过开源代码，但是如果你没有用过github说明你已经out了。github pages是github的一个服务，可以为你的账号或项目提供免费的网站服务。喜欢github pages的原因是因为pages支持markdown格式，markdown格式是我见过最好用的标签语言。找了很久都没能找到满意的支持代码的博客。github pages觉得是最合适的。简单，漂亮又功能多。 <a href="http://www.yangzhiping.com/tech/wordpress-to-jekyll.html">Jekyll</a> 是github pages的基础，<a href="http://octopress.org/">Octopress</a>是Jekyll的一个扩展。 废话太多，下面说下我是怎么配置的吧。</p>
<p>github pages 帮助文档：<a href="https://help.github.com/categories/20/articles">https://help.github.com/categories/20/articles</a></p>
<p>Octopress 帮助文档：<a href="http://octopress.org/docs/setup/">http://octopress.org/docs/setup/</a></p>
<h2>创建项目主页</h2>
<ol>
<li>创建一个github项目，项目名字必须为username/username.github.com,比如我的用户名是gary34,项目名称必须为gary34/gary34.github.com
具体怎么做就点<a href="https://help.github.com/articles/creating-pages-with-the-automatic-generator">这里</a></li>
<li>在github设置上给你的项目加上你的pubkey，不知道什么是pubkey或是windows的就算了，这里不适合你们。</li>
<li><a href="http://octopress.org/docs/setup/">安装Octopress</a>,大概的意思是先安装git ,然后clone Octopress代码，然后rake install 。Octopress 就装好了。</li>
<li>进入<a href="http://octopress.org/docs/deploying/github/">下一步</a>,把Octopress部署到你的github上，</li>
</ol>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
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</pre></td><td class='code'><pre><code class=''><span class='line'>rake setup_github_pages
</span><span class='line'>rake generate
</span><span class='line'>rake deploy
</span><span class='line'>git add .
</span><span class='line'>git commit -m 'your message'
</span><span class='line'>git push origin source</span></code></pre></td></tr></table></div></figure>
<p>10分钟之后访问你的pages主页，就可以看到主页已经变成Octopress了。</p>
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