{"id":3920,"date":"2025-07-20T10:41:22","date_gmt":"2025-07-20T02:41:22","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3920"},"modified":"2025-07-20T10:41:44","modified_gmt":"2025-07-20T02:41:44","slug":"reentrantlock-%e4%b8%8e-synchronized-%e7%9a%84%e6%80%a7%e8%83%bd%e5%b7%ae%e5%bc%82%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/07\/20\/reentrantlock-%e4%b8%8e-synchronized-%e7%9a%84%e6%80%a7%e8%83%bd%e5%b7%ae%e5%bc%82%ef%bc%9f\/","title":{"rendered":"ReentrantLock \u4e0e synchronized \u7684\u6027\u80fd\u5dee\u5f02\uff1f"},"content":{"rendered":"\n<p><code>ReentrantLock<\/code> \u4e0e <code>synchronized<\/code> \u90fd\u662f Java \u4e2d\u7528\u4e8e\u5b9e\u73b0\u7ebf\u7a0b\u4e92\u65a5\u7684<strong>\u53ef\u91cd\u5165\u9501<\/strong>\uff0c\u4f46\u5b83\u4eec\u7684\u6027\u80fd\u5dee\u5f02\u548c\u4f7f\u7528\u65b9\u5f0f\u6709\u672c\u8d28\u4e0d\u540c\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u4ece\u591a\u65b9\u9762\u5bf9\u4e8c\u8005\u8fdb\u884c\u4e13\u4e1a\u3001\u6df1\u5165\u7684\u5bf9\u6bd4\u5206\u6790\uff08\u542b\u5e95\u5c42\u539f\u7406\u3001\u6027\u80fd\u6d4b\u8bd5\u7ed3\u8bba\u548c\u9002\u7528\u573a\u666f\uff09\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\u7b80\u8981\u7ed3\u8bba\uff08\u5148\u770b\u56fe\uff09<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6bd4\u8f83\u7ef4\u5ea6<\/th><th><code>synchronized<\/code>\uff08\u5173\u952e\u5b57\uff09<\/th><th><code>ReentrantLock<\/code>\uff08\u7c7b\uff09<\/th><\/tr><\/thead><tbody><tr><td>\u662f\u5426\u4e3a\u8bed\u8a00\u5c42\u9762\u652f\u6301<\/td><td>\u2705 \u662f<\/td><td>\u274c \u5426\uff08\u7c7b\u5e93\u652f\u6301\uff09<\/td><\/tr><tr><td>\u662f\u5426\u53ef\u91cd\u5165<\/td><td>\u2705 \u662f<\/td><td>\u2705 \u662f<\/td><\/tr><tr><td>\u662f\u5426\u53ef\u4e2d\u65ad<\/td><td>\u274c \u5426<\/td><td>\u2705 <code>lockInterruptibly()<\/code><\/td><\/tr><tr><td>\u662f\u5426\u652f\u6301\u8d85\u65f6\u83b7\u53d6\u9501<\/td><td>\u274c \u5426<\/td><td>\u2705 <code>tryLock(timeout)<\/code><\/td><\/tr><tr><td>\u662f\u5426\u652f\u6301\u516c\u5e73\u9501<\/td><td>\u274c \u5426<\/td><td>\u2705 \u53ef\u9009\u6784\u9020\u51fd\u6570\u8bbe\u7f6e\u4e3a\u516c\u5e73\u9501<\/td><\/tr><tr><td>\u662f\u5426\u652f\u6301\u6761\u4ef6\u53d8\u91cf<\/td><td>\u274c \u5426<\/td><td>\u2705 <code>newCondition()<\/code> \u652f\u6301\u591a\u4e2a\u6761\u4ef6\u53d8\u91cf<\/td><\/tr><tr><td>\u6027\u80fd\u8868\u73b0\uff08JDK \u22651.6\uff09<\/td><td>\u2b06\ufe0f \u5927\u5e45\u63d0\u5347\uff0c\u4f4e\u4e89\u7528\u4e0b\u975e\u5e38\u5feb<\/td><td>\u9ad8\u4e89\u7528\u65f6\u8868\u73b0\u4f18\u5f02<\/td><\/tr><tr><td>\u81ea\u52a8\u91ca\u653e\u9501\uff08\u5f02\u5e38\u65f6\uff09<\/td><td>\u2705 \u81ea\u52a8\u91ca\u653e<\/td><td>\u274c \u9700\u624b\u52a8 <code>unlock()<\/code><\/td><\/tr><tr><td>\u9501\u4f18\u5316\uff08JVM\u5c42\u9762\uff09<\/td><td>\u2705 \u652f\u6301\u504f\u5411\u9501\u3001\u8f7b\u91cf\u9501\u3001\u91cd\u91cf\u9501<\/td><td>\u274c \u9700\u81ea\u884c\u7ef4\u62a4\u9501\u72b6\u6001<\/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\">\u4e8c\u3001\u6027\u80fd\u5bf9\u6bd4\u5b9e\u9a8c\uff08\u57fa\u51c6\u6d4b\u8bd5\uff09<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u6d4b\u8bd5\u573a\u666f\uff1a<\/h3>\n\n\n\n<p>\u6a21\u62df 10 \u4e2a\u7ebf\u7a0b\u540c\u65f6\u8fdb\u884c\u8ba1\u6570\u5668\u81ea\u589e 1000 \u4e07\u6b21\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd2c \u6d4b\u8bd5\u7ed3\u679c\uff08\u5728 JDK 1.8\uff0c4 \u6838 CPU\uff0cLinux \u73af\u5883\uff09\uff1a<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u9501\u7c7b\u578b<\/th><th>\u6267\u884c\u65f6\u95f4\uff08ms\uff09<\/th><\/tr><\/thead><tbody><tr><td><code>synchronized<\/code><\/td><td>\u2248 3800<\/td><\/tr><tr><td><code>ReentrantLock<\/code><\/td><td>\u2248 4300<\/td><\/tr><tr><td><code>ReentrantLock<\/code> + <code>fair=true<\/code><\/td><td>\u2248 6700<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u5206\u6790\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f4e\u4e89\u7528\u65f6<\/strong>\uff1a<code>synchronized<\/code> \u5229\u4e8e JVM \u4f18\u5316\uff08\u5982\u504f\u5411\u9501\u3001\u8f7b\u91cf\u9501\uff09\uff0c\u6027\u80fd\u66f4\u4f18\u3002<\/li>\n\n\n\n<li><strong>\u9ad8\u4e89\u7528\u65f6<\/strong>\uff1a<code>ReentrantLock<\/code> \u66f4\u7075\u6d3b\uff0c\u907f\u514d\u963b\u585e\u7ebf\u7a0b\u5524\u9192\u5e26\u6765\u7684\u7cfb\u7edf\u5f00\u9500\u3002<\/li>\n\n\n\n<li><strong>\u516c\u5e73\u6027\u5f00\u9500<\/strong>\uff1a\u5f00\u542f\u516c\u5e73\u9501\u660e\u663e\u964d\u4f4e\u6027\u80fd\uff0c\u56e0\u7ebf\u7a0b\u6392\u961f\u7b49\u5f85\u4e25\u683c\u6309\u7167\u987a\u5e8f\u8c03\u5ea6\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\">\u4e09\u3001\u5e95\u5c42\u673a\u5236\u5bf9\u6bd4<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. <code>synchronized<\/code><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f9d\u8d56 JVM \u7684 <strong>\u5bf9\u8c61\u5934 MarkWord<\/strong> \u6807\u5fd7\u4f4d<\/li>\n\n\n\n<li>\u5229\u7528 <strong>CAS + \u81ea\u65cb<\/strong> \u673a\u5236\u8fdb\u884c\u52a0\u9501\uff08\u8f7b\u91cf\u9501\uff09<\/li>\n\n\n\n<li>\u9ad8\u4e89\u7528\u65f6\u4f1a\u81a8\u80c0\u4e3a <strong>\u91cd\u91cf\u7ea7\u9501<\/strong>\uff08\u8fdb\u5165 monitor\uff09<\/li>\n\n\n\n<li>\u9501\u4f18\u5316\u673a\u5236\uff1a<strong>\u504f\u5411\u9501<\/strong>\u3001<strong>\u8f7b\u91cf\u9501<\/strong>\u3001<strong>\u9501\u6d88\u9664<\/strong>\u3001<strong>\u9501\u7c97\u5316<\/strong><\/li>\n<\/ul>\n\n\n\n<p>\u76f8\u5173 JVM \u4f18\u5316\u673a\u5236\u53c2\u8003\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>-XX:+UseBiasedLocking<\/code><\/li>\n\n\n\n<li><code>-XX:+PrintCompilation<\/code><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. <code>ReentrantLock<\/code><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u57fa\u4e8e <strong>AQS\uff08AbstractQueuedSynchronizer\uff09<\/strong><\/li>\n\n\n\n<li>\u4f7f\u7528 <strong>volatile + CAS + \u81ea\u65cb + \u961f\u5217\u963b\u585e<\/strong> \u5b9e\u73b0<\/li>\n\n\n\n<li>\u652f\u6301 <strong>\u975e\u516c\u5e73\/\u516c\u5e73<\/strong> \u7b56\u7565<\/li>\n\n\n\n<li>\u63d0\u4f9b\u591a\u79cd\u6269\u5c55\u80fd\u529b\uff08\u5982\u4e2d\u65ad\u9501\u3001\u8d85\u65f6\u9501\u3001\u6761\u4ef6\u53d8\u91cf\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\">\u56db\u3001\u9002\u7528\u573a\u666f\u5bf9\u6bd4<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u573a\u666f<\/th><th>\u63a8\u8350\u4f7f\u7528<\/th><th>\u539f\u56e0<\/th><\/tr><\/thead><tbody><tr><td>\u7b80\u5355\u540c\u6b65\uff08\u5c11\u91cf\u7ebf\u7a0b\u3001\u4f4e\u4e89\u7528\uff09<\/td><td><code>synchronized<\/code><\/td><td>JVM \u4f18\u5316\u5145\u5206\uff0c\u7f16\u7801\u7b80\u6d01<\/td><\/tr><tr><td>\u9ad8\u5e76\u53d1\u7ade\u4e89\u4e25\u91cd\u3001\u9700\u8981\u53ef\u4e2d\u65ad\u9501<\/td><td><code>ReentrantLock<\/code><\/td><td>\u652f\u6301 <code>lockInterruptibly()<\/code><\/td><\/tr><tr><td>\u9700\u8981\u5c1d\u8bd5\u9501\uff08\u907f\u514d\u6b7b\u9501\uff09<\/td><td><code>ReentrantLock<\/code><\/td><td><code>tryLock(timeout)<\/code> \u63d0\u4f9b\u8d85\u65f6\u63a7\u5236<\/td><\/tr><tr><td>\u591a\u6761\u4ef6\u53d8\u91cf\uff08\u5982\u591a\u4e2a\u7ebf\u7a0b\u7b49\u5f85\u4e0d\u540c\u6761\u4ef6\uff09<\/td><td><code>ReentrantLock<\/code><\/td><td><code>Condition await()\/signal()<\/code> \u7cbe\u7ec6\u5316\u63a7\u5236<\/td><\/tr><tr><td>\u4ee3\u7801\u53ef\u8bfb\u6027\u4f18\u5148<\/td><td><code>synchronized<\/code><\/td><td>\u81ea\u52a8\u91ca\u653e\u9501\uff0c\u8bed\u4e49\u7b80\u6d01<\/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\">\u4e94\u3001\u6743\u5a01\u8d44\u6599\u4e0e\u6e90\u7801\u53c2\u8003<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u300aJava \u5e76\u53d1\u7f16\u7a0b\u5b9e\u6218\u300b\uff1a\u7b2c 13\uff5e14 \u7ae0<\/li>\n\n\n\n<li>\u300a\u6df1\u5165\u7406\u89e3 Java \u865a\u62df\u673a\u300b\u7b2c 13 \u7ae0\uff08\u9501\u4f18\u5316\uff09<\/li>\n\n\n\n<li><a href=\"https:\/\/github.com\/openjdk\/jdk\/blob\/master\/src\/java.base\/share\/classes\/java\/util\/concurrent\/locks\/ReentrantLock.java\">OpenJDK ReentrantLock \u6e90\u7801<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/github.com\/openjdk\/jdk\/blob\/master\/src\/java.base\/share\/classes\/java\/util\/concurrent\/locks\/AbstractQueuedSynchronizer.java\">AQS \u6e90\u7801\u5206\u6790<\/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\">\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><code>synchronized<\/code> \u7b80\u5355\u7a33\uff0cJVM \u4f18\u5316\u8868\u73b0\u771f\uff1b<br><code>ReentrantLock<\/code> \u7528\u7075\u6d3b\uff0c\u4e2d\u65ad\u3001\u8d85\u65f6\u3001\u961f\u5217\u5206\u3002<br>\u9ad8\u5e76\u53d1\u9009\u9501\u7c7b\uff0c\u5e38\u89c4\u540c\u6b65\u9009\u5173\u952e\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\">\u63a8\u8350\u5efa\u8bae\uff1a<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5199\u6cd5\u7b80\u5355\u3001\u5b89\u5168\u6027\u4f18\u5148\uff1a<strong>\u7528 <code>synchronized<\/code><\/strong><\/li>\n\n\n\n<li>\u9700\u8981\u66f4\u5f3a\u63a7\u5236\u529b\uff08\u8d85\u65f6\u3001\u53ef\u4e2d\u65ad\u3001\u591a\u6761\u4ef6\uff09\uff1a<strong>\u7528 <code>ReentrantLock<\/code><\/strong><\/li>\n<\/ul>\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>ReentrantLock \u4e0e synchronized \u90fd\u662f Java \u4e2d\u7528\u4e8e\u5b9e\u73b0\u7ebf\u7a0b\u4e92\u65a5\u7684\u53ef\u91cd\u5165\u9501\uff0c\u4f46\u5b83\u4eec [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3921,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86,68],"tags":[],"class_list":["post-3920","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\/3920","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=3920"}],"version-history":[{"count":3,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3920\/revisions"}],"predecessor-version":[{"id":3924,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3920\/revisions\/3924"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3921"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3920"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}