https://axerzone.cn/tags/%E5%B9%B6%E5%8F%91/Recent content in 并发 on Weiming's BlogHugo -- gohugo.iozh-cn© 2026 WeimingThu, 20 Jul 2023 00:00:00 +0000https://axerzone.cn/posts/java-memory-model-volatile/Thu, 20 Jul 2023 00:00:00 +0000https://axerzone.cn/posts/java-memory-model-volatile/<h1 class="relative group">volatile 到底能保证什么 <div id="volatile-到底能保证什么" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#volatile-%e5%88%b0%e5%ba%95%e8%83%bd%e4%bf%9d%e8%af%81%e4%bb%80%e4%b9%88" aria-label="锚点">#</a> </span> </h1> <h2 class="relative group">Java 内存模型简单说 <div id="java-内存模型简单说" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#java-%e5%86%85%e5%ad%98%e6%a8%a1%e5%9e%8b%e7%ae%80%e5%8d%95%e8%af%b4" aria-label="锚点">#</a> </span> </h2> <p>聊 volatile 之前，得先说说 Java 内存模型（JMM）。放心，不讲太深，够理解 volatile 就行。</p>https://axerzone.cn/posts/java-thread-pool/Fri, 10 Feb 2023 00:00:00 +0000https://axerzone.cn/posts/java-thread-pool/<h1 class="relative group">线程池这玩意，用不好真的会出事 <div id="线程池这玩意用不好真的会出事" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%e7%ba%bf%e7%a8%8b%e6%b1%a0%e8%bf%99%e7%8e%a9%e6%84%8f%e7%94%a8%e4%b8%8d%e5%a5%bd%e7%9c%9f%e7%9a%84%e4%bc%9a%e5%87%ba%e4%ba%8b" aria-label="锚点">#</a> </span> </h1> <p>上周实验室项目出了个线上问题，排查了一下午发现是线程池配置不对导致的 OOM。这事让我意识到，线程池看着简单，用不好是真会出事的。</p> <h2 class="relative group">为什么要用线程池 <div id="为什么要用线程池" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%e4%b8%ba%e4%bb%80%e4%b9%88%e8%a6%81%e7%94%a8%e7%ba%bf%e7%a8%8b%e6%b1%a0" aria-label="锚点">#</a> </span> </h2> <p>你可能觉得，new 一个 Thread 跑任务不就完了？能跑，但有几个问题：</p>https://axerzone.cn/posts/concurrenthashmap-deep-dive/Sun, 20 Nov 2022 00:00:00 +0000https://axerzone.cn/posts/concurrenthashmap-deep-dive/<h1 class="relative group">ConcurrentHashMap 到底怎么保证线程安全的 <div id="concurrenthashmap-到底怎么保证线程安全的" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#concurrenthashmap-%e5%88%b0%e5%ba%95%e6%80%8e%e4%b9%88%e4%bf%9d%e8%af%81%e7%ba%bf%e7%a8%8b%e5%ae%89%e5%85%a8%e7%9a%84" aria-label="锚点">#</a> </span> </h1> <p>上篇写了 HashMap，有同学私信问我 ConcurrentHashMap 和 HashMap 有什么区别。其实吧，区别大了去了，JDK8 的 ConcurrentHashMap 基本是重写的，跟 JDK7 完全两个思路。</p> <p>花了差不多一周把源码理清楚，这篇来聊聊它到底怎么在并发场景下保证线程安全。</p> <h2 class="relative group">JDK7 的 Segment 分段锁 <div id="jdk7-的-segment-分段锁" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#jdk7-%e7%9a%84-segment-%e5%88%86%e6%ae%b5%e9%94%81" aria-label="锚点">#</a> </span> </h2> <p>先说 JDK7 的方案，面试还是会问。</p>