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content="第三篇我们要来讲下 Worker 这个“打工人”,线程池里实际在干活的同学 Worker 实现了 Runnable 接口,所以在前面介绍的 addWorker 中 线程启动其实就调用了下面的 run 方法,而 run 方法则调用了内部的 runWorker 方法 介绍下这个 r…" itemprop=description></span><header class=post-header><h1 itemprop="name headline" class=post-title>Java 线程池系列-第三篇</h1><div class=post-meta-container><div class=post-meta><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar"></i> </span><span class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间:2024-02-24 23:09:57" datetime=2024-02-24T23:09:57+08:00>2024-02-24</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/ itemprop=url rel=index><span itemprop=name>Java</span></a> </span></span><span class="post-meta-item cloudflare-page-counter" data-title="Java 线程池系列-第三篇" data-increment=true data-path=/2024/02/24/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%89%E7%AF%87/ title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数:</span> <span class=cloudflare-page-counter-count></span></span></div><div class=post-description>第三篇我们要来讲下 Worker 这个“打工人”,线程池里实际在干活的同学 Worker 实现了 Runnable 接口,所以在前面介绍的 addWorker 中 线程启动其实就调用了下面的 run 方法,而 run 方法则调用了内部的 runWorker 方法 介绍下这个 r…</div></div></header><div class=post-body itemprop=articleBody><p>第三篇我们要来讲下 Worker 这个“打工人”,线程池里实际在干活的同学<br>Worker 实现了 Runnable 接口,所以在前面介绍的 <code>addWorker</code> 中<br>线程启动其实就调用了下面的 run 方法,而 run 方法则调用了内部的<br><code>runWorker</code> 方法<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br></pre><td class=code><pre><span class=line></span><br><span class=line><span class=keyword>private</span> <span class=keyword>final</span> <span class=keyword>class</span> <span class="title class_">Worker</span></span><br><span class=line> <span class=keyword>extends</span> <span class="title class_">AbstractQueuedSynchronizer</span></span><br><span class=line> <span class=keyword>implements</span> <span class="title class_">Runnable</span></span><br><span class=line>{</span><br><span class=line> <span class=comment>/**</span></span><br><span class=line><span class=comment> * This class will never be serialized, but we provide a</span></span><br><span class=line><span class=comment> * serialVersionUID to suppress a javac warning.</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line> <span class=keyword>private</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>long</span> <span class=variable>serialVersionUID</span> <span class=operator>=</span> <span class=number>6138294804551838833L</span>;</span><br><span class=line></span><br><span class=line> <span class=comment>/** Thread this worker is running in. Null if factory fails. */</span></span><br><span class=line> <span class=keyword>final</span> Thread thread;</span><br><span class=line> <span class=comment>/** Initial task to run. Possibly null. */</span></span><br><span class=line> Runnable firstTask;</span><br><span class=line> <span class=comment>/** Per-thread task counter */</span></span><br><span class=line> <span class=keyword>volatile</span> <span class=type>long</span> completedTasks;</span><br><span class=line></span><br><span class=line> <span class=comment>/**</span></span><br><span class=line><span class=comment> * Creates with given first task and thread from ThreadFactory.</span></span><br><span class=line><span class=comment> * <span class=doctag>@param</span> firstTask the first task (null if none)</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line> Worker(Runnable firstTask) {</span><br><span class=line> setState(-<span class=number>1</span>); <span class=comment>// inhibit interrupts until runWorker</span></span><br><span class=line> <span class=built_in>this</span>.firstTask = firstTask;</span><br><span class=line> <span class=built_in>this</span>.thread = getThreadFactory().newThread(<span class=built_in>this</span>);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>/** Delegates main run loop to outer runWorker */</span></span><br><span class=line> <span class=comment>// 启动线程 Worker</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">run</span><span class=params>()</span> {</span><br><span class=line> runWorker(<span class=built_in>this</span>);</span><br><span class=line> }</span><br></pre></table></figure><p>介绍下这个 <code>runWorker</code> 方法<br>这里就会先处理 firstTask,如果 firstTask 是 null 则会去队列里取<br>里面会有两个钩子,一个是执行前,一个是执行后,注意这个循环是没有常规<br>退出逻辑的,说明是一直在往队列里获取,除非获取队列里的任务超时失败了<br>这样就到最后会去执行 <code>processWorkerExit</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br></pre><td class=code><pre><span class=line><span class=keyword>final</span> <span class=keyword>void</span> <span class="title function_">runWorker</span><span class=params>(Worker w)</span> {</span><br><span class=line> <span class=type>Thread</span> <span class=variable>wt</span> <span class=operator>=</span> Thread.currentThread();</span><br><span class=line> <span class=type>Runnable</span> <span class=variable>task</span> <span class=operator>=</span> w.firstTask;</span><br><span class=line> w.firstTask = <span class=literal>null</span>;</span><br><span class=line> w.unlock(); <span class=comment>// allow interrupts</span></span><br><span class=line> <span class=type>boolean</span> <span class=variable>completedAbruptly</span> <span class=operator>=</span> <span class=literal>true</span>;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>// firstTask 不为空或者从队列里获取到任务</span></span><br><span class=line> <span class=keyword>while</span> (task != <span class=literal>null</span> || (task = getTask()) != <span class=literal>null</span>) {</span><br><span class=line> w.lock();</span><br><span class=line> <span class=comment>// If pool is stopping, ensure thread is interrupted;</span></span><br><span class=line> <span class=comment>// if not, ensure thread is not interrupted. This</span></span><br><span class=line> <span class=comment>// requires a recheck in second case to deal with</span></span><br><span class=line> <span class=comment>// shutdownNow race while clearing interrupt</span></span><br><span class=line> <span class=keyword>if</span> ((runStateAtLeast(ctl.get(), STOP) ||</span><br><span class=line> (Thread.interrupted() &&</span><br><span class=line> runStateAtLeast(ctl.get(), STOP))) &&</span><br><span class=line> !wt.isInterrupted())</span><br><span class=line> wt.interrupt();</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>// 前置执行钩子</span></span><br><span class=line> beforeExecute(wt, task);</span><br><span class=line> <span class=type>Throwable</span> <span class=variable>thrown</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>// 任务执行</span></span><br><span class=line> task.run();</span><br><span class=line> } <span class=keyword>catch</span> (RuntimeException x) {</span><br><span class=line> thrown = x; <span class=keyword>throw</span> x;</span><br><span class=line> } <span class=keyword>catch</span> (Error x) {</span><br><span class=line> thrown = x; <span class=keyword>throw</span> x;</span><br><span class=line> } <span class=keyword>catch</span> (Throwable x) {</span><br><span class=line> thrown = x; <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">Error</span>(x);</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=comment>// 执行完后的钩子</span></span><br><span class=line> afterExecute(task, thrown);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=comment>// 最后会执行到这,清空任务</span></span><br><span class=line> task = <span class=literal>null</span>;</span><br><span class=line> w.completedTasks++;</span><br><span class=line> w.unlock();</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> completedAbruptly = <span class=literal>false</span>;</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=comment>// 循环的最后就会去退出Worker</span></span><br><span class=line> processWorkerExit(w, completedAbruptly);</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>而这个 <code>processWorkerExit</code> 也有个比较特殊的逻辑<br>照理我们会想到这里可能就是线程在处理完队列里的任务<br>以后,就会判断下是否要退出,如果是核心线程的话就不用<br>如果是非核心线程就会退出了,但是这里其实有个替换逻辑<br>就是最后有个 addWorker 调用<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br></pre><td class=code><pre><span class=line><span class=keyword>private</span> <span class=keyword>void</span> <span class="title function_">processWorkerExit</span><span class=params>(Worker w, <span class=type>boolean</span> completedAbruptly)</span> {</span><br><span class=line> <span class=keyword>if</span> (completedAbruptly) <span class=comment>// If abrupt, then workerCount wasn't adjusted</span></span><br><span class=line> decrementWorkerCount();</span><br><span class=line></span><br><span class=line> <span class=keyword>final</span> <span class=type>ReentrantLock</span> <span class=variable>mainLock</span> <span class=operator>=</span> <span class=built_in>this</span>.mainLock;</span><br><span class=line> mainLock.lock();</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> completedTaskCount += w.completedTasks;</span><br><span class=line> workers.remove(w);</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> mainLock.unlock();</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> tryTerminate();</span><br><span class=line></span><br><span class=line> <span class=type>int</span> <span class=variable>c</span> <span class=operator>=</span> ctl.get();</span><br><span class=line> <span class=comment>// 判断状态</span></span><br><span class=line> <span class=keyword>if</span> (runStateLessThan(c, STOP)) {</span><br><span class=line> <span class=keyword>if</span> (!completedAbruptly) {</span><br><span class=line> <span class=comment>// 核心线程是否也需要退出</span></span><br><span class=line> <span class=type>int</span> <span class=variable>min</span> <span class=operator>=</span> allowCoreThreadTimeOut ? <span class=number>0</span> : corePoolSize;</span><br><span class=line> <span class=keyword>if</span> (min == <span class=number>0</span> && ! workQueue.isEmpty())</span><br><span class=line> min = <span class=number>1</span>;</span><br><span class=line> <span class=comment>// 这里代表非核心线程就可以不用替换,也就是回收线程了</span></span><br><span class=line> <span class=keyword>if</span> (workerCountOf(c) >= min)</span><br><span class=line> <span class=keyword>return</span>; <span class=comment>// replacement not needed</span></span><br><span class=line> }</span><br><span class=line> <span class=comment>// 否则是替换线程</span></span><br><span class=line> addWorker(<span class=literal>null</span>, <span class=literal>false</span>);</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>这里主要讲了线程 Worker 运行的逻辑</div><footer class=post-footer><div class="affiliate-creative affiliate-creative--post-end" data-affiliate-id=tencent-cloud-general><a rel="sponsored noopener" aria-label=腾讯云产品优惠 href=https://cloud.tencent.com/act/cps/redirect?redirect=2446&cps_key=2e33a1eedb380997d03618b4a5ba6ca7&from=console target=_blank><img alt=腾讯云服务器、数据库和云产品优惠 decoding=async height=419 loading=lazy src=/uploads/affiliate/tencent-cloud-general.webp width=690> </a><span class=affiliate-disclosure>推广</span></div><div class=reward-container><div>请我一杯咖啡吧!</div><button>赞赏</button><div class=post-reward><div><img alt="Nicksxs 微信" src=https://i.loli.net/2020/01/12/NUlWanT31E8LQGx.png><span>微信</span></div><div><img alt="Nicksxs 支付宝" src=https://ooo.0o0.ooo/2016/08/17/57b421e773057.jpg><span>支付宝</span></div></div></div><div class=post-copyright><ul><li class=post-copyright-author><strong>本文作者: </strong>Nicksxs<li class=post-copyright-link><strong>本文链接:</strong> <a title="Java 线程池系列-第三篇" href=https://nicksxs.me/2024/02/24/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%89%E7%AF%87/>https://nicksxs.me/2024/02/24/Java-线程池系列-第三篇/</a><li class=post-copyright-license><strong>版权声明: </strong>本博客所有文章除特别声明外,均采用 <a href=https://creativecommons.org/licenses/by-nc-sa/4.0/ rel=noopener target=_blank><i class="fab fa-fw fa-creative-commons"></i>BY-NC-SA</a> 许可协议。转载请注明出处!</ul></div><div class=post-tags><a href=/tags/Java/ rel=tag># Java</a></div><div class=post-nav><div class=post-nav-item><a title="Java 线程池系列-第二篇" href=/2024/02/18/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%BA%8C%E7%AF%87/ rel=prev><i class="fa fa-angle-left"></i> Java 线程池系列-第二篇</a></div><div class=post-nav-item><a title="Java 线程池系列-第四篇" href=/2024/03/03/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E5%9B%9B%E7%AF%87/ rel=next>Java 线程池系列-第四篇 <i class="fa fa-angle-right"></i></a></div></div></footer></article></div><div class=comments id=disqus_thread><noscript>Please enable JavaScript to view the comments powered by Disqus.</noscript></div></div></main><footer class=footer><div class=footer-inner><div class=beian><a href=https://beian.miit.gov.cn/ rel=noopener target=_blank>浙ICP备16002580号-2 </a><img alt src=/uploads/beian.png><a href=https://beian.mps.gov.cn/#/query/webSearch?code=33010602011094 rel=noopener target=_blank>浙公网安备 33010602011094号</a></div><div class=copyright>© <span itemprop=copyrightYear>2026</span><span class=with-love><i class="fa fa-heart"></i> </span><span class=author itemprop=copyrightHolder>Nicksxs</span></div></div></footer><div class="toggle sidebar-toggle" role=button><span class=toggle-line></span><span class=toggle-line></span><span class=toggle-line></span></div><div class=sidebar-dimmer></div><div aria-label=返回顶部 class=back-to-top role=button><i class="fa fa-arrow-up fa-lg"></i><span>0%</span></div><a aria-label="在 GitHub 上关注我" title="在 GitHub 上关注我" class=github-corner href=https://github.com/nicksxs rel=noopener target=_blank><svg viewbox="0 0 250 250" aria-hidden=true height=80 width=80><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" style="transform-origin:130px 106px" class=octo-arm fill=currentColor></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" class=octo-body fill=currentColor></path></svg></a><noscript><div class=noscript-warning>Theme NexT works best with JavaScript enabled</div></noscript><script data-cloudflare-page-counter-config type=application/json>{"enable":true,"endpoint":"https://counter.nicksxs.me","site":"nicksxs","local_cache":true,"timeout":5000,"icon":"far fa-eye","item_text":true}</script><script src=/js/cloudflare-page-counter.js></script><script class=next-config data-name=disqus type=application/json>{"enable":true,"shortname":"nicksxs","count":false,"i18n":{"disqus":"disqus"}}</script><script defer src=/js/third-party/comments/disqus.js></script>
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