{"id":3940,"date":"2025-07-20T11:04:28","date_gmt":"2025-07-20T03:04:28","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3940"},"modified":"2025-07-20T11:04:28","modified_gmt":"2025-07-20T03:04:28","slug":"%e5%a6%82%e4%bd%95%e7%9b%91%e6%8e%a7%e5%92%8c%e8%b0%83%e4%bc%98%e9%94%81%e7%9a%84%e7%ad%89%e5%be%85%e9%98%9f%e5%88%97%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/07\/20\/%e5%a6%82%e4%bd%95%e7%9b%91%e6%8e%a7%e5%92%8c%e8%b0%83%e4%bc%98%e9%94%81%e7%9a%84%e7%ad%89%e5%be%85%e9%98%9f%e5%88%97%ef%bc%9f\/","title":{"rendered":"\u5982\u4f55\u76d1\u63a7\u548c\u8c03\u4f18\u9501\u7684\u7b49\u5f85\u961f\u5217\uff1f"},"content":{"rendered":"\n<p>\u5728\u9ad8\u5e76\u53d1\u7cfb\u7edf\u4e2d\uff0c<strong>\u9501\u7b49\u5f85\u961f\u5217\u76d1\u63a7\u4e0e\u8c03\u4f18<\/strong>\u662f\u4fdd\u969c\u7cfb\u7edf\u6027\u80fd\u548c\u54cd\u5e94\u65f6\u95f4\u7684\u5173\u952e\u624b\u6bb5\uff0c\u7279\u522b\u662f\u5728\u4f7f\u7528 <code>ReentrantLock<\/code>\u3001<code>synchronized<\/code>\u3001<code>StampedLock<\/code> \u7b49\u663e\u5f0f\u6216\u9690\u5f0f\u9501\u65f6\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u5c06\u4ece<strong>\u53ef\u89c2\u6d4b\u6027\u5de5\u5177\u3001\u6e90\u7801\u63a5\u53e3\u3001\u8c03\u4f18\u65b9\u6cd5\u4e0e\u6700\u4f73\u5b9e\u8df5<\/strong>\u56db\u4e2a\u65b9\u9762\u5168\u9762\u5c55\u5f00\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u4ec0\u4e48\u662f\u201c\u9501\u7b49\u5f85\u961f\u5217\u201d\uff1f<\/h2>\n\n\n\n<p>\u5f53\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bf7\u6c42\u67d0\u4e2a\u9501\u5bf9\u8c61\uff0c\u800c\u8be5\u9501\u5df2\u88ab\u5360\u7528\u65f6\uff0c<strong>\u672a\u80fd\u6210\u529f\u83b7\u53d6\u9501\u7684\u7ebf\u7a0b<\/strong>\u4f1a\u8fdb\u5165\u4e00\u4e2a<strong>\u7b49\u5f85\u961f\u5217<\/strong>\uff0c\u79f0\u4e3a<strong>\u9501\u7b49\u5f85\u961f\u5217<\/strong>\uff08Lock Wait Queue\uff09\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5bf9\u4e8e <code>AQS<\/code> \u5b9e\u73b0\uff08\u5982 <code>ReentrantLock<\/code>\uff09\uff0c\u8fd9\u4e9b\u7ebf\u7a0b\u4f1a\u52a0\u5165 CLH \u7b49\u5f85\u961f\u5217\u3002<\/li>\n\n\n\n<li>\u5bf9\u4e8e <code>synchronized<\/code>\uff0c\u8fd9\u4e9b\u7ebf\u7a0b\u4f1a\u88ab\u52a0\u5165\u5bf9\u8c61\u76d1\u89c6\u5668\u7684 <code>EntryList<\/code> \u548c <code>WaitSet<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u5982\u4f55\u76d1\u63a7\u9501\u7684\u7b49\u5f85\u961f\u5217\uff1f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. JDK \u5185\u7f6e\u76d1\u63a7\u5de5\u5177<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">JDK \u5de5\u5177 <code>jstack<\/code><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>jstack &lt;pid&gt; &gt; thread-dump.txt<\/code><\/pre>\n\n\n\n<p>\u5206\u6790\u7ebf\u7a0b\u6808\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>BLOCKED<\/strong>\uff1a\u88ab\u963b\u585e\u5728\u9501\u4e0a\uff08\u672a\u83b7\u5f97 monitor\uff09<\/li>\n\n\n\n<li><strong>WAITING \/ TIMED_WAITING<\/strong>\uff1a\u8c03\u7528\u4e86 <code>wait()<\/code> \u6216 <code>LockSupport.park()<\/code> \u7b49<\/li>\n\n\n\n<li>\u6808\u4e2d\u53ef\u770b\u5230 <code>at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(...)<\/code> \u7b49\u9501\u76f8\u5173\u5806\u6808<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b\u8f93\u51fa\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>\"Thread-1\" #12 prio=5 os_prio=0 tid=0x00007fbd6800c000 nid=0x4bd waiting for monitor entry &#91;0x00007fbd5c3fc000]\n   java.lang.Thread.State: BLOCKED (on object monitor)\n    at com.example.LockExample.method(LockExample.java:25)<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Java \u7f16\u7a0b API\uff08<code>ThreadMXBean<\/code>\uff09<\/h3>\n\n\n\n<p>\u4f7f\u7528 Java \u63d0\u4f9b\u7684\u7ba1\u7406\u63a5\u53e3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.lang.management.*;\n\nThreadMXBean mbean = ManagementFactory.getThreadMXBean();\nlong&#91;] ids = mbean.findMonitorDeadlockedThreads();\nThreadInfo&#91;] infos = mbean.getThreadInfo(ids, true, true);<\/code><\/pre>\n\n\n\n<p>\u8fd8\u53ef\u67e5\u770b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u54ea\u4e9b\u7ebf\u7a0b\u6301\u6709\u9501<\/li>\n\n\n\n<li>\u54ea\u4e9b\u7ebf\u7a0b\u88ab\u54ea\u4e2a\u9501\u963b\u585e<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Arthas \u5b9e\u65f6\u76d1\u63a7\uff08\u63a8\u8350\uff09<\/h3>\n\n\n\n<p>\u963f\u91cc\u5f00\u6e90\u7684\u5f3a\u5927 Java \u8bca\u65ad\u5de5\u5177\uff0c\u652f\u6301\u8fd0\u884c\u65f6\u89c2\u5bdf\u9501\u7b49\u5f85\u60c5\u51b5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>.\/as.sh<\/code><\/pre>\n\n\n\n<p>\u5e38\u7528\u547d\u4ee4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>thread<\/code> \u67e5\u770b\u7ebf\u7a0b\u72b6\u6001<\/li>\n\n\n\n<li><code>dashboard<\/code> \u5b9e\u65f6\u76d1\u63a7<\/li>\n\n\n\n<li><code>monitor<\/code> \u76d1\u63a7\u65b9\u6cd5\u8c03\u7528\u65f6\u95f4<\/li>\n\n\n\n<li><code>watch<\/code> \u67e5\u770b\u67d0\u6bb5\u65b9\u6cd5\u8c03\u7528\u524d\u540e\u9501\u60c5\u51b5<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u4f7f\u7528 JFR\uff08Java Flight Recorder\uff09<\/h3>\n\n\n\n<p>JFR \u53ef\u4ee5\u6355\u83b7\u7ebf\u7a0b\u7b49\u5f85\u3001\u9501\u7ade\u4e89\u4e8b\u4ef6\uff0c\u5e76\u5728 JDK Mission Control \u4e2d\u53ef\u89c6\u5316\u5206\u6790\u3002<\/p>\n\n\n\n<p>\u542f\u52a8\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>java -XX:StartFlightRecording=filename=record.jfr,settings=profile ...<\/code><\/pre>\n\n\n\n<p>\u5728 GUI \u4e2d\u5206\u6790\u9501\u7ade\u4e89\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LockInstance<\/li>\n\n\n\n<li>Contended Lock<\/li>\n\n\n\n<li>Lock Owner<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u9501\u7b49\u5f85\u961f\u5217\u8c03\u4f18\u7b56\u7565<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u95ee\u9898\u8bc6\u522b<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u73b0\u8c61<\/th><th>\u53ef\u80fd\u95ee\u9898<\/th><\/tr><\/thead><tbody><tr><td>\u67d0\u4e9b\u7ebf\u7a0b\u957f\u65f6\u95f4 BLOCKED<\/td><td>\u9501\u7c92\u5ea6\u8fc7\u5927\uff0c\u6216\u67d0\u7ebf\u7a0b\u6301\u9501\u592a\u4e45<\/td><\/tr><tr><td>\u6b7b\u9501\uff08\u4e24\u4e2a\u7ebf\u7a0b\u76f8\u4e92\u7b49\u5f85\uff09<\/td><td>\u83b7\u53d6\u9501\u987a\u5e8f\u4e0d\u4e00\u81f4\uff0c\u6216\u8d44\u6e90\u83b7\u53d6\u4e0d\u4e00\u81f4<\/td><\/tr><tr><td>\u5927\u91cf\u7ebf\u7a0b\u9891\u7e41\u8fdb\u5165 WAITING \u6216 TIME_WAITING<\/td><td>\u7ebf\u7a0b\u8fc7\u591a\u3001\u8d44\u6e90\u7ade\u4e89\u6fc0\u70c8\u3001\u8c03\u5ea6\u9971\u548c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u8c03\u4f18\u624b\u6bb5\u548c\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u51cf\u5c11\u9501\u7c92\u5ea6 \/ \u62c6\u5206\u9501<\/h3>\n\n\n\n<p><strong>\u5927\u9501\u53d8\u5c0f\u9501<\/strong>\uff0c\u907f\u514d\u7ade\u4e89\u3002\u4f8b\u5982\u6309\u6a21\u5757\u3001\u6570\u636e\u5206\u7247\u6216\u64cd\u4f5c\u533a\u95f4\u52a0\u9501\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u4e0d\u63a8\u8350\nlock.lock();\ntry {\n    \/\/ \u64cd\u4f5c A + B\n} finally {\n    lock.unlock();\n}\n\n\/\/ \u63a8\u8350\nlockA.lock();\ntry {\n    \/\/ \u64cd\u4f5c A\n} finally {\n    lockA.unlock();\n}\n\nlockB.lock();\ntry {\n    \/\/ \u64cd\u4f5c B\n} finally {\n    lockB.unlock();\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u4f7f\u7528 <code>tryLock()<\/code> \u8bbe\u7f6e\u8d85\u65f6\u63a7\u5236<\/h3>\n\n\n\n<p>\u907f\u514d\u7ebf\u7a0b\u65e0\u9650\u7b49\u5f85\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (lock.tryLock(100, TimeUnit.MILLISECONDS)) {\n    try {\n        \/\/ \u5904\u7406\u4efb\u52a1\n    } finally {\n        lock.unlock();\n    }\n} else {\n    \/\/ \u653e\u5f03\u5904\u7406\u6216\u5165\u961f\u91cd\u8bd5\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u4f7f\u7528\u8bfb\u5199\u9501 <code>ReentrantReadWriteLock<\/code><\/h3>\n\n\n\n<p>\u5982\u679c\u8bfb\u64cd\u4f5c\u8fdc\u591a\u4e8e\u5199\u64cd\u4f5c\uff0c\u53ef\u63d0\u5347\u5e76\u53d1\u5ea6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ReadWriteLock rwLock = new ReentrantReadWriteLock();\nrwLock.readLock().lock();   \/\/ \u591a\u7ebf\u7a0b\u5e76\u53d1\u8bfb\nrwLock.writeLock().lock();  \/\/ \u5199\u72ec\u5360<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u4f7f\u7528 <code>StampedLock<\/code> \u66ff\u4ee3\u4f20\u7edf\u9501\uff08\u66f4\u8f7b\u91cf\uff09<\/h3>\n\n\n\n<p><code>StampedLock<\/code> \u63d0\u4f9b\u4e50\u89c2\u8bfb\u9501\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>StampedLock lock = new StampedLock();\nlong stamp = lock.tryOptimisticRead();\nif (lock.validate(stamp)) {\n    \/\/ \u6ca1\u6709\u5199\u5165\u53d1\u751f\uff0c\u53ef\u4ee5\u653e\u5fc3\u4f7f\u7528\u6570\u636e\n} else {\n    \/\/ \u83b7\u53d6\u60b2\u89c2\u8bfb\u9501\n    stamp = lock.readLock();\n    try {\n        \/\/ \u8bfb\u53d6\u64cd\u4f5c\n    } finally {\n        lock.unlockRead(stamp);\n    }\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. \u9650\u5236\u7ebf\u7a0b\u6c60\u6700\u5927\u7ebf\u7a0b\u6570\uff0c\u51cf\u5c11\u4e89\u7528<\/h3>\n\n\n\n<p>\u4f8b\u5982\uff1a\u4f7f\u7528 <code>ThreadPoolExecutor<\/code> \u7684 <code>corePoolSize<\/code> \u9650\u5236\u540c\u65f6\u7ade\u4e89\u9501\u7684\u7ebf\u7a0b\u6570\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u68c0\u6d4b\u6b7b\u9501\u60c5\u51b5<\/h2>\n\n\n\n<p>\u4f7f\u7528 JDK \u63d0\u4f9b API\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>long&#91;] deadlockedThreads = mbean.findDeadlockedThreads();\nif (deadlockedThreads != null) {\n    for (long tid : deadlockedThreads) {\n        ThreadInfo ti = mbean.getThreadInfo(tid);\n        System.out.println(\"Deadlocked: \" + ti.getThreadName());\n    }\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u53c2\u8003\u8d44\u6599<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li> <a href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/lang\/management\/ThreadMXBean.html\">OpenJDK &#8211; ThreadMXBean<\/a><\/li>\n\n\n\n<li> <a href=\"https:\/\/www.oracle.com\/java\/technologies\/jdk-mission-control.html\">Java Mission Control<\/a><\/li>\n\n\n\n<li> <a href=\"https:\/\/github.com\/alibaba\/arthas\">Arthas Java Diagnostic Tool<\/a><\/li>\n\n\n\n<li> <em>Java Concurrency in Practice<\/em> \u7b2c 11 \u7ae0<\/li>\n\n\n\n<li> <em>\u6df1\u5165\u7406\u89e3 Java \u865a\u62df\u673a<\/em> \u2014 \u6027\u80fd\u8c03\u4f18\u90e8\u5206<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u603b\u7ed3\u53e3\u8bc0<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u9501\u76d1\u63a7\uff0c\u5148\u770b jstack\uff1b<br>Arthas \u5b9e\u65f6\u663e\u795e\u901a\uff1b<br>\u6b7b\u9501\u53ef\u67e5 MXBean\uff0c<br>\u8c03\u4f18\u7c92\u5ea6\u3001\u8bfb\u5199\u5206\u3001tryLock \u8f85\u52a9\u62a2\u65f6\u7a7a\u3002<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u9ad8\u5e76\u53d1\u7cfb\u7edf\u4e2d\uff0c\u9501\u7b49\u5f85\u961f\u5217\u76d1\u63a7\u4e0e\u8c03\u4f18\u662f\u4fdd\u969c\u7cfb\u7edf\u6027\u80fd\u548c\u54cd\u5e94\u65f6\u95f4\u7684\u5173\u952e\u624b\u6bb5\uff0c\u7279\u522b\u662f\u5728\u4f7f\u7528 ReentrantLoc [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3941,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68,86],"tags":[],"class_list":["post-3940","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","category-java-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3940","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3940"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3940\/revisions"}],"predecessor-version":[{"id":3942,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3940\/revisions\/3942"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3941"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3940"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3940"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3940"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}