{"id":3865,"date":"2025-07-12T13:29:00","date_gmt":"2025-07-12T05:29:00","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3865"},"modified":"2025-07-12T13:29:00","modified_gmt":"2025-07-12T05:29:00","slug":"%e6%ad%bb%e9%94%81%e7%9a%84%e5%8f%91%e7%94%9f%e5%8e%9f%e5%9b%a0%e5%92%8c%e6%80%8e%e4%b9%88%e9%81%bf%e5%85%8d","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/07\/12\/%e6%ad%bb%e9%94%81%e7%9a%84%e5%8f%91%e7%94%9f%e5%8e%9f%e5%9b%a0%e5%92%8c%e6%80%8e%e4%b9%88%e9%81%bf%e5%85%8d\/","title":{"rendered":"\u6b7b\u9501\u7684\u53d1\u751f\u539f\u56e0\u548c\u600e\u4e48\u907f\u514d"},"content":{"rendered":"\n<p>\u201c<strong>\u6b7b\u9501\uff08Deadlock\uff09<\/strong>\u201d\u662f\u5e76\u53d1\u7f16\u7a0b\u4e2d\u4e00\u79cd\u4e25\u91cd\u7684\u95ee\u9898\uff0c\u5b83\u4f1a\u5bfc\u81f4\u591a\u4e2a\u7ebf\u7a0b\u4e92\u76f8\u7b49\u5f85\u5bf9\u65b9\u91ca\u653e\u8d44\u6e90\uff0c\u4ece\u800c<strong>\u6c38\u4e45\u963b\u585e\uff0c\u7a0b\u5e8f\u4e0d\u518d\u524d\u8fdb<\/strong>\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\u6b7b\u9501\uff1f<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u6b7b\u9501\u662f\u6307\u4e24\u4e2a\u6216\u591a\u4e2a\u7ebf\u7a0b\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u56e0\u4e89\u593a\u8d44\u6e90\u800c\u9020\u6210\u7684\u4e00\u79cd\u4e92\u76f8\u7b49\u5f85\u7684\u73b0\u8c61\uff0c<strong>\u82e5\u65e0\u5916\u529b\u5e72\u6d89\uff0c\u5b83\u4eec\u5c06\u6c38\u8fdc\u7b49\u5f85\u4e0b\u53bb<\/strong>\u3002<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u6b7b\u9501\u53d1\u751f\u7684\u56db\u4e2a\u5fc5\u8981\u6761\u4ef6\uff08\u64cd\u4f5c\u7cfb\u7edf\u5b9a\u4e49\uff09<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6761\u4ef6<\/th><th>\u542b\u4e49\u8bf4\u660e<\/th><\/tr><\/thead><tbody><tr><td><strong>\u4e92\u65a5\u6761\u4ef6<\/strong><\/td><td>\u81f3\u5c11\u4e00\u4e2a\u8d44\u6e90\u53ea\u80fd\u88ab\u4e00\u4e2a\u7ebf\u7a0b\u5360\u7528<\/td><\/tr><tr><td><strong>\u8bf7\u6c42\u4fdd\u6301\u6761\u4ef6<\/strong><\/td><td>\u4e00\u4e2a\u7ebf\u7a0b\u6301\u6709\u8d44\u6e90\u7684\u540c\u65f6\uff0c\u518d\u8bf7\u6c42\u5176\u4ed6\u8d44\u6e90<\/td><\/tr><tr><td><strong>\u4e0d\u5265\u593a\u6761\u4ef6<\/strong><\/td><td>\u5df2\u83b7\u53d6\u7684\u8d44\u6e90\u4e0d\u80fd\u88ab\u5f3a\u5236\u5265\u593a\uff0c\u53ea\u80fd\u7ebf\u7a0b\u81ea\u5df1\u91ca\u653e<\/td><\/tr><tr><td><strong>\u5faa\u73af\u7b49\u5f85\u6761\u4ef6<\/strong><\/td><td>\u82e5\u5e72\u7ebf\u7a0b\u4e4b\u95f4\u5f62\u6210\u4e86\u8d44\u6e90\u7684\u5faa\u73af\u7b49\u5f85\u94fe<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>\u53ea\u8981\u56db\u4e2a\u6761\u4ef6\u540c\u65f6\u6ee1\u8db3\uff0c\u5c31\u53ef\u80fd\u53d1\u751f\u6b7b\u9501\u3002<\/strong><br><strong>\u6253\u7834\u4efb\u4f55\u4e00\u4e2a\u6761\u4ef6\uff0c\u5c31\u80fd\u907f\u514d\u6b7b\u9501\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u7ecf\u5178\u6b7b\u9501\u4ee3\u7801\u793a\u4f8b\uff08Java\uff09<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>public class DeadlockDemo {\n    static final Object lockA = new Object();\n    static final Object lockB = new Object();\n\n    public static void main(String&#91;] args) {\n        Thread t1 = new Thread(() -&gt; {\n            synchronized (lockA) {\n                System.out.println(\"T1 \u6301\u6709 lockA\uff0c\u7b49\u5f85 lockB...\");\n                try { Thread.sleep(100); } catch (InterruptedException ignored) {}\n                synchronized (lockB) {\n                    System.out.println(\"T1 \u83b7\u53d6 lockB\");\n                }\n            }\n        });\n\n        Thread t2 = new Thread(() -&gt; {\n            synchronized (lockB) {\n                System.out.println(\"T2 \u6301\u6709 lockB\uff0c\u7b49\u5f85 lockA...\");\n                try { Thread.sleep(100); } catch (InterruptedException ignored) {}\n                synchronized (lockA) {\n                    System.out.println(\"T2 \u83b7\u53d6 lockA\");\n                }\n            }\n        });\n\n        t1.start();\n        t2.start();\n    }\n}<\/code><\/pre>\n\n\n\n<p>\ud83d\udc46 <strong>\u8f93\u51fa\u505c\u5728\u4e24\u4e2a\u7ebf\u7a0b\u90fd\u7b49\u5f85\u5bf9\u65b9\u65f6\uff0c\u4e0d\u4f1a\u518d\u7ee7\u7eed\u8fd0\u884c \u2014\u2014 \u6b7b\u9501\u4e86\u3002<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u6b7b\u9501\u7684\u5e38\u89c1\u53d1\u751f\u573a\u666f<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u591a\u7ebf\u7a0b\u6301\u6709\u591a\u4e2a\u9501\u4e14<strong>\u52a0\u9501\u987a\u5e8f\u4e0d\u4e00\u81f4<\/strong><\/li>\n\n\n\n<li>\u6570\u636e\u5e93\u4e8b\u52a1\u4e2d\uff0c\u591a\u4e2a\u8fde\u63a5<strong>\u4ea4\u53c9\u9501\u8868\u6216\u8bb0\u5f55<\/strong><\/li>\n\n\n\n<li>\u4f7f\u7528 synchronized \u65f6\u5d4c\u5957\u591a\u4e2a\u9501\uff08\u5d4c\u5957\u540c\u6b65\u5757\uff09<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>ReentrantLock.lock()<\/code> \u4e0d\u52a0\u8d85\u65f6\u5904\u7406<\/li>\n\n\n\n<li>\u64cd\u4f5c\u7cfb\u7edf\u5c42\u9762\u6b7b\u9501\uff08\u5982\u6587\u4ef6\u9501\u3001\u8bbe\u5907\u9501\uff09<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u907f\u514d\u6b7b\u9501\u7684\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>\u7edf\u4e00\u52a0\u9501\u987a\u5e8f\uff08\u63a8\u8350\uff09<\/strong><\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u4fdd\u8bc1\u6240\u6709\u7ebf\u7a0b\u6309\u7167\u76f8\u540c\u987a\u5e8f\u83b7\u53d6\u8d44\u6e90\u3002<\/p>\n<\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Always lock A before B\nsynchronized (lockA) {\n    synchronized (lockB) {\n        \/\/ safe code\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\">2. <strong>\u52a0\u9501\u65f6\u4f7f\u7528 tryLock + \u8d85\u65f6\u673a\u5236<\/strong><\/h3>\n\n\n\n<p>\u9002\u7528\u4e8e <code>ReentrantLock<\/code>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (lockA.tryLock(1, TimeUnit.SECONDS)) {\n    try {\n        if (lockB.tryLock(1, TimeUnit.SECONDS)) {\n            try {\n                \/\/ safe code\n            } finally {\n                lockB.unlock();\n            }\n        }\n    } finally {\n        lockA.unlock();\n    }\n}<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\ud83d\udc49 \u907f\u514d\u65e0\u9650\u7b49\u5f85\uff0c\u53ef\u8bbe\u7f6e\u56de\u9000\u7b56\u7565\u3002<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>\u907f\u514d\u5d4c\u5957\u9501\uff08\u4e0d\u5fc5\u8981\u4e0d\u8981\u83b7\u53d6\u591a\u4e2a\u9501\uff09<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7b80\u5316\u4ee3\u7801\u7ed3\u6784<\/li>\n\n\n\n<li>\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4<\/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. <strong>\u4f7f\u7528\u5b9a\u65f6\u9501\u3001\u663e\u5f0f\u9501\u91ca\u653e\u673a\u5236<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6bd4\u5982\u4f7f\u7528 <code>Lock<\/code> \u7684 <code>tryLock()<\/code> \u800c\u4e0d\u662f <code>lock()<\/code><\/li>\n\n\n\n<li>\u6216\u8005\u4f7f\u7528 <code>synchronized<\/code> + \u5c3d\u65e9\u91ca\u653e<\/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\">5. <strong>\u4f7f\u7528\u6b7b\u9501\u68c0\u6d4b\u5de5\u5177<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>jstack<\/code> \u67e5\u770b\u7ebf\u7a0b\u5806\u6808\u72b6\u6001<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  jstack &lt;pid&gt;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IntelliJ IDEA\u3001VisualVM \u7b49\u652f\u6301\u7ebf\u7a0b\u56fe\u3001\u6b7b\u9501\u63d0\u793a<\/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\">6. <strong>\u4f7f\u7528\u9ad8\u7ea7\u5e76\u53d1\u6846\u67b6\uff08\u5982 Akka\u3001Actor \u6a21\u578b\uff09<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u907f\u514d\u7ebf\u7a0b\u76f4\u63a5\u6301\u6709\u5171\u4eab\u8d44\u6e90<\/li>\n\n\n\n<li>\u6d88\u606f\u9a71\u52a8\u7684\u67b6\u6784\u4e0d\u4f1a\u4ea7\u751f\u4f20\u7edf\u610f\u4e49\u4e0a\u7684\u9501<\/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\">\u516d\u3001\u6570\u636e\u5e93\u5c42\u9762\u7684\u6b7b\u9501<\/h2>\n\n\n\n<p>\u5728\u6570\u636e\u5e93\u4e2d\uff0c\u4e8b\u52a1\u95f4\u9501\u5b9a\u540c\u4e00\u5f20\u8868\u7684\u4e0d\u540c\u8bb0\u5f55\uff0c\u4e5f\u53ef\u80fd\u6b7b\u9501\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e3e\u4f8b\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e8b\u52a1 A\uff1a<code>UPDATE table WHERE id=1<\/code><\/li>\n\n\n\n<li>\u4e8b\u52a1 B\uff1a<code>UPDATE table WHERE id=2<\/code><\/li>\n\n\n\n<li>\u7136\u540e A \u518d\u9501 id=2\uff0cB \u518d\u9501 id=1 \u21d2 \u6b7b\u9501\uff01<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u89e3\u51b3\u65b9\u6cd5\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7edf\u4e00\u66f4\u65b0\u987a\u5e8f\uff08\u5982 always id \u5c0f\u7684\u5148\u9501\uff09<\/li>\n\n\n\n<li>\u63a7\u5236\u4e8b\u52a1\u8303\u56f4\uff08\u8d8a\u5c0f\u8d8a\u597d\uff09<\/li>\n\n\n\n<li>\u68c0\u67e5\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff08\u5982\u4e0d\u4f7f\u7528 <code>SERIALIZABLE<\/code>\uff09<\/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\">\ud83d\udcda \u4e03\u3001\u53c2\u8003\u8d44\u6599<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd17 <a href=\"https:\/\/docs.oracle.com\/javase\/tutorial\/essential\/concurrency\/\">Java \u5e76\u53d1\u5b98\u65b9\u6587\u6863<\/a><\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/technotes\/guides\/troubleshoot\/threadhang.html\">Oracle \u5173\u4e8e\u6b7b\u9501\u8bf4\u660e<\/a><\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/github.com\/alibaba\/p3c\">\u963f\u91cc\u5df4\u5df4 Java \u5f00\u53d1\u624b\u518c\uff1a\u5e76\u53d1\u7bc7<\/a><\/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\">\u516b\u3001\u9762\u8bd5\u63d0\u95ee\u6a21\u62df\u603b\u7ed3<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u9762\u8bd5\u95ee\u9898<\/th><th>\u7b54\u6848\u8981\u70b9<\/th><\/tr><\/thead><tbody><tr><td>\u4ec0\u4e48\u662f\u6b7b\u9501\uff1f\u5982\u4f55\u53d1\u751f\uff1f<\/td><td>\u5b9a\u4e49 + \u56db\u4e2a\u5fc5\u8981\u6761\u4ef6<\/td><\/tr><tr><td>\u6b7b\u9501\u5e38\u89c1\u793a\u4f8b\uff1f<\/td><td>\u4e24\u7ebf\u7a0b\u4e92\u9501 A\u3001B \u7684\u4f8b\u5b50<\/td><\/tr><tr><td>\u5982\u4f55\u907f\u514d\u6b7b\u9501\uff1f<\/td><td>\u52a0\u9501\u987a\u5e8f\u7edf\u4e00\u3001tryLock \u8d85\u65f6\u3001\u63a7\u5236\u9501\u7c92\u5ea6\u7b49<\/td><\/tr><tr><td>\u5982\u4f55\u6392\u67e5\u6b7b\u9501\uff1f<\/td><td>jstack\u3001\u7ebf\u7a0b dump \u5de5\u5177<\/td><\/tr><tr><td>\u6570\u636e\u5e93\u6b7b\u9501\u5982\u4f55\u907f\u514d\uff1f<\/td><td>\u63a7\u5236\u9501\u987a\u5e8f\u3001\u51cf\u5c11\u4e8b\u52a1\u65f6\u95f4<\/td><\/tr><\/tbody><\/table><\/figure>\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>\u201c\u6b7b\u9501\uff08Deadlock\uff09\u201d\u662f\u5e76\u53d1\u7f16\u7a0b\u4e2d\u4e00\u79cd\u4e25\u91cd\u7684\u95ee\u9898\uff0c\u5b83\u4f1a\u5bfc\u81f4\u591a\u4e2a\u7ebf\u7a0b\u4e92\u76f8\u7b49\u5f85\u5bf9\u65b9\u91ca\u653e\u8d44\u6e90\uff0c\u4ece\u800c\u6c38\u4e45\u963b\u585e\uff0c\u7a0b [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3866,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-3865","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3865","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=3865"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3865\/revisions"}],"predecessor-version":[{"id":3867,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3865\/revisions\/3867"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3866"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3865"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3865"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3865"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}