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Site updated at 2013-10-02 11:44:34 UTC
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‎atom.xml

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<title><![CDATA[Lumint's Octopress Blog]]></title>
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<link href="http://lumint.github.io/atom.xml" rel="self"/>
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<link href="http://lumint.github.io/"/>
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<updated>2013-10-02T17:27:09+08:00</updated>
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<updated>2013-10-02T19:43:35+08:00</updated>
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<id>http://lumint.github.io/</id>
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<author>
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<name><![CDATA[Lumint]]></name>
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<p>
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当一个线程进入critical section时,那么JVM是根据什么来判断该线程是否能进入呢?当编写程序设定critical section时,我们会为该critical section指定一个mutex(互斥量),而互斥量的值将决定
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;当一个线程进入critical section时,那么JVM是根据什么来判断该线程是否能进入呢?当编写程序设定critical section时,我们会为该critical section指定一个mutex(互斥量),而互斥量的值将决定
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其他线程是否可以进入该Critical Section.
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&#8220;` Java
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synchronized(mutex){
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&#8230;
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}
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&#8220;`
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</p>
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<pre><code> synchronized(mutex){
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// critical section code
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...
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}
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</code></pre>
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<p>
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;在Java使用上面语法可以设置Critical Section,对于互斥的代码可以写入Critical Section.如下面代码:<br/>
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</p>
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<figure class='code'><figcaption><span>ThreadSync1.java</span><a href='http://weibo.com/u/2277842353'>Weibo</a></figcaption><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='ruby'><span class='line'><span class="kp">public</span> <span class="k">class</span> <span class="nc">ThreadSync1</span> <span class="n">implements</span> <span class="no">Runnable</span><span class="p">{</span>
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</span><span class='line'> <span class="kp">private</span> <span class="no">Object</span> <span class="n">mutex</span><span class="p">;</span>
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</span><span class='line'>
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</span><span class='line'> <span class="kp">public</span> <span class="no">ThreadSync1</span><span class="p">(</span><span class="no">Object</span> <span class="n">mutex</span><span class="p">)</span> <span class="p">{</span>
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</span><span class='line'> <span class="n">this</span><span class="o">.</span><span class="n">mutex</span> <span class="o">=</span> <span class="n">mutex</span><span class="p">;</span>
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</span><span class='line'> <span class="p">}</span>
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</span><span class='line'>
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</span><span class='line'> <span class="kp">public</span> <span class="n">static</span> <span class="n">void</span> <span class="n">main</span><span class="p">(</span><span class="nb">String</span><span class="o">[]</span> <span class="n">args</span><span class="p">)</span> <span class="p">{</span>
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</span><span class='line'> <span class="no">Object</span> <span class="n">mutex1</span> <span class="o">=</span> <span class="kp">new</span> <span class="no">Object</span><span class="p">();</span>
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</span><span class='line'> <span class="no">Object</span> <span class="n">mutex2</span> <span class="o">=</span> <span class="kp">new</span> <span class="no">Object</span><span class="p">();</span>
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</span><span class='line'> <span class="kp">new</span> <span class="no">Thread</span><span class="p">(</span><span class="kp">new</span> <span class="no">ThreadSync1</span><span class="p">(</span><span class="n">mutex1</span><span class="p">),</span><span class="s2">&quot;线程一&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">start</span><span class="p">();</span>
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</span><span class='line'> <span class="kp">new</span> <span class="no">Thread</span><span class="p">(</span><span class="kp">new</span> <span class="no">ThreadSync1</span><span class="p">(</span><span class="n">mutex1</span><span class="p">),</span><span class="s2">&quot;线程二&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">start</span><span class="p">();</span>
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</span><span class='line'> <span class="kp">new</span> <span class="no">Thread</span><span class="p">(</span><span class="kp">new</span> <span class="no">ThreadSync1</span><span class="p">(</span><span class="n">mutex1</span><span class="p">),</span><span class="s2">&quot;线程三&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">start</span><span class="p">();</span>
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</span><span class='line'> <span class="kp">new</span> <span class="no">Thread</span><span class="p">(</span><span class="kp">new</span> <span class="no">ThreadSync1</span><span class="p">(</span><span class="n">mutex2</span><span class="p">),</span><span class="s2">&quot;线程四&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">start</span><span class="p">();</span>
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</span><span class='line'> <span class="p">}</span>
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</span><span class='line'>
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</span><span class='line'> <span class="kp">public</span> <span class="n">void</span> <span class="n">setMutex</span><span class="p">(</span><span class="no">Object</span> <span class="n">mutex</span><span class="p">)</span> <span class="p">{</span>
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</span><span class='line'> <span class="n">this</span><span class="o">.</span><span class="n">mutex</span> <span class="o">=</span> <span class="n">mutex</span><span class="p">;</span>
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</span><span class='line'> <span class="p">}</span>
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</span><span class='line'>
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</span><span class='line'> <span class="vi">@Override</span>
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</span><span class='line'> <span class="kp">public</span> <span class="n">void</span> <span class="n">run</span><span class="p">()</span> <span class="p">{</span>
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</span><span class='line'> <span class="n">synchronized</span> <span class="p">(</span><span class="n">mutex</span><span class="p">)</span> <span class="p">{</span>
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</span><span class='line'> <span class="no">System</span><span class="o">.</span><span class="n">out</span><span class="o">.</span><span class="n">println</span><span class="p">(</span><span class="no">Thread</span><span class="o">.</span><span class="n">currentThread</span><span class="p">()</span><span class="o">.</span><span class="n">getName</span><span class="p">()</span> <span class="o">+</span> <span class="s2">&quot;进入Critical Section! 等待5秒!&quot;</span><span class="p">);</span>
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</span><span class='line'> <span class="n">try</span> <span class="p">{</span>
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</span><span class='line'> <span class="k">for</span><span class="p">(</span><span class="n">int</span> <span class="n">i</span> <span class="o">=</span><span class="mi">0</span><span class="p">;</span><span class="n">i</span><span class="o">&lt;</span><span class="mi">5</span><span class="p">;</span><span class="n">i</span><span class="o">++</span><span class="p">){</span>
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</span><span class='line'> <span class="no">Thread</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1000</span><span class="p">);</span>
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</span><span class='line'> <span class="no">System</span><span class="o">.</span><span class="n">out</span><span class="o">.</span><span class="n">println</span><span class="p">(</span><span class="n">i</span><span class="o">+</span><span class="mi">1</span><span class="p">);</span>
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</span><span class='line'> <span class="p">}</span>
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</span><span class='line'> <span class="p">}</span> <span class="kp">catch</span> <span class="p">(</span><span class="no">InterruptedException</span> <span class="n">e</span><span class="p">)</span> <span class="p">{</span>
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</span><span class='line'> <span class="n">e</span><span class="o">.</span><span class="n">printStackTrace</span><span class="p">();</span>
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</span><span class='line'> <span class="p">}</span>
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</span><span class='line'> <span class="no">System</span><span class="o">.</span><span class="n">out</span><span class="o">.</span><span class="n">println</span><span class="p">(</span><span class="no">Thread</span><span class="o">.</span><span class="n">currentThread</span><span class="p">()</span><span class="o">.</span><span class="n">getName</span><span class="p">()</span> <span class="o">+</span> <span class="s2">&quot;退出Critical Section! 等待5秒!&quot;</span><span class="p">);</span>
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</span><span class='line'> <span class="p">}</span>
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</span><span class='line'>
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</span><span class='line'> <span class="p">}</span>
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</span><span class='line'> <span class="p">}</span>
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</span></code></pre></td></tr></table></div></figure>
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]]></content>
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</entry>
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‎blog/2013/10/01/thread-synchronized-1/index.html

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<p>
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当一个线程进入critical section时,那么JVM是根据什么来判断该线程是否能进入呢?当编写程序设定critical section时,我们会为该critical section指定一个mutex(互斥量),而互斥量的值将决定
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;当一个线程进入critical section时,那么JVM是根据什么来判断该线程是否能进入呢?当编写程序设定critical section时,我们会为该critical section指定一个mutex(互斥量),而互斥量的值将决定
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其他线程是否可以进入该Critical Section.
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&#8220;` Java
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synchronized(mutex){
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&#8230;
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}
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&#8220;`
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</p>
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<pre><code> synchronized(mutex){
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// critical section code
147+
...
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}
149+
</code></pre>
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<p>
152+
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;在Java使用上面语法可以设置Critical Section,对于互斥的代码可以写入Critical Section.如下面代码:<br/>
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</p>
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<figure class='code'><figcaption><span>ThreadSync1.java</span><a href='http://weibo.com/u/2277842353'>Weibo</a></figcaption><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='ruby'><span class='line'><span class="kp">public</span> <span class="k">class</span> <span class="nc">ThreadSync1</span> <span class="n">implements</span> <span class="no">Runnable</span><span class="p">{</span>
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</span><span class='line'> <span class="kp">private</span> <span class="no">Object</span> <span class="n">mutex</span><span class="p">;</span>
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</span><span class='line'>
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</span><span class='line'> <span class="kp">public</span> <span class="no">ThreadSync1</span><span class="p">(</span><span class="no">Object</span> <span class="n">mutex</span><span class="p">)</span> <span class="p">{</span>
199+
</span><span class='line'> <span class="n">this</span><span class="o">.</span><span class="n">mutex</span> <span class="o">=</span> <span class="n">mutex</span><span class="p">;</span>
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</span><span class='line'> <span class="p">}</span>
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</span><span class='line'>
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</span><span class='line'> <span class="kp">public</span> <span class="n">static</span> <span class="n">void</span> <span class="n">main</span><span class="p">(</span><span class="nb">String</span><span class="o">[]</span> <span class="n">args</span><span class="p">)</span> <span class="p">{</span>
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</span><span class='line'> <span class="no">Object</span> <span class="n">mutex1</span> <span class="o">=</span> <span class="kp">new</span> <span class="no">Object</span><span class="p">();</span>
204+
</span><span class='line'> <span class="no">Object</span> <span class="n">mutex2</span> <span class="o">=</span> <span class="kp">new</span> <span class="no">Object</span><span class="p">();</span>
205+
</span><span class='line'> <span class="kp">new</span> <span class="no">Thread</span><span class="p">(</span><span class="kp">new</span> <span class="no">ThreadSync1</span><span class="p">(</span><span class="n">mutex1</span><span class="p">),</span><span class="s2">&quot;线程一&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">start</span><span class="p">();</span>
206+
</span><span class='line'> <span class="kp">new</span> <span class="no">Thread</span><span class="p">(</span><span class="kp">new</span> <span class="no">ThreadSync1</span><span class="p">(</span><span class="n">mutex1</span><span class="p">),</span><span class="s2">&quot;线程二&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">start</span><span class="p">();</span>
207+
</span><span class='line'> <span class="kp">new</span> <span class="no">Thread</span><span class="p">(</span><span class="kp">new</span> <span class="no">ThreadSync1</span><span class="p">(</span><span class="n">mutex1</span><span class="p">),</span><span class="s2">&quot;线程三&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">start</span><span class="p">();</span>
208+
</span><span class='line'> <span class="kp">new</span> <span class="no">Thread</span><span class="p">(</span><span class="kp">new</span> <span class="no">ThreadSync1</span><span class="p">(</span><span class="n">mutex2</span><span class="p">),</span><span class="s2">&quot;线程四&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">start</span><span class="p">();</span>
209+
</span><span class='line'> <span class="p">}</span>
210+
</span><span class='line'>
211+
</span><span class='line'> <span class="kp">public</span> <span class="n">void</span> <span class="n">setMutex</span><span class="p">(</span><span class="no">Object</span> <span class="n">mutex</span><span class="p">)</span> <span class="p">{</span>
212+
</span><span class='line'> <span class="n">this</span><span class="o">.</span><span class="n">mutex</span> <span class="o">=</span> <span class="n">mutex</span><span class="p">;</span>
213+
</span><span class='line'> <span class="p">}</span>
214+
</span><span class='line'>
215+
</span><span class='line'> <span class="vi">@Override</span>
216+
</span><span class='line'> <span class="kp">public</span> <span class="n">void</span> <span class="n">run</span><span class="p">()</span> <span class="p">{</span>
217+
</span><span class='line'> <span class="n">synchronized</span> <span class="p">(</span><span class="n">mutex</span><span class="p">)</span> <span class="p">{</span>
218+
</span><span class='line'> <span class="no">System</span><span class="o">.</span><span class="n">out</span><span class="o">.</span><span class="n">println</span><span class="p">(</span><span class="no">Thread</span><span class="o">.</span><span class="n">currentThread</span><span class="p">()</span><span class="o">.</span><span class="n">getName</span><span class="p">()</span> <span class="o">+</span> <span class="s2">&quot;进入Critical Section! 等待5秒!&quot;</span><span class="p">);</span>
219+
</span><span class='line'> <span class="n">try</span> <span class="p">{</span>
220+
</span><span class='line'> <span class="k">for</span><span class="p">(</span><span class="n">int</span> <span class="n">i</span> <span class="o">=</span><span class="mi">0</span><span class="p">;</span><span class="n">i</span><span class="o">&lt;</span><span class="mi">5</span><span class="p">;</span><span class="n">i</span><span class="o">++</span><span class="p">){</span>
221+
</span><span class='line'> <span class="no">Thread</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1000</span><span class="p">);</span>
222+
</span><span class='line'> <span class="no">System</span><span class="o">.</span><span class="n">out</span><span class="o">.</span><span class="n">println</span><span class="p">(</span><span class="n">i</span><span class="o">+</span><span class="mi">1</span><span class="p">);</span>
223+
</span><span class='line'> <span class="p">}</span>
224+
</span><span class='line'> <span class="p">}</span> <span class="kp">catch</span> <span class="p">(</span><span class="no">InterruptedException</span> <span class="n">e</span><span class="p">)</span> <span class="p">{</span>
225+
</span><span class='line'> <span class="n">e</span><span class="o">.</span><span class="n">printStackTrace</span><span class="p">();</span>
226+
</span><span class='line'> <span class="p">}</span>
227+
</span><span class='line'> <span class="no">System</span><span class="o">.</span><span class="n">out</span><span class="o">.</span><span class="n">println</span><span class="p">(</span><span class="no">Thread</span><span class="o">.</span><span class="n">currentThread</span><span class="p">()</span><span class="o">.</span><span class="n">getName</span><span class="p">()</span> <span class="o">+</span> <span class="s2">&quot;退出Critical Section! 等待5秒!&quot;</span><span class="p">);</span>
228+
</span><span class='line'> <span class="p">}</span>
229+
</span><span class='line'>
230+
</span><span class='line'> <span class="p">}</span>
231+
</span><span class='line'> <span class="p">}</span>
232+
</span></code></pre></td></tr></table></div></figure>
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</div>
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