{"id":3842,"date":"2025-07-12T12:46:43","date_gmt":"2025-07-12T04:46:43","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3842"},"modified":"2025-07-12T12:48:16","modified_gmt":"2025-07-12T04:48:16","slug":"%e7%ba%bf%e7%a8%8b%e6%b1%a0%e5%a6%82%e4%bd%95%e7%9f%a5%e9%81%93%e4%b8%80%e4%b8%aa%e7%ba%bf%e7%a8%8b%e7%9a%84%e4%bb%bb%e5%8a%a1%e5%b7%b2%e7%bb%8f%e6%89%a7%e8%a1%8c%e5%ae%8c%e6%88%90","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/07\/12\/%e7%ba%bf%e7%a8%8b%e6%b1%a0%e5%a6%82%e4%bd%95%e7%9f%a5%e9%81%93%e4%b8%80%e4%b8%aa%e7%ba%bf%e7%a8%8b%e7%9a%84%e4%bb%bb%e5%8a%a1%e5%b7%b2%e7%bb%8f%e6%89%a7%e8%a1%8c%e5%ae%8c%e6%88%90\/","title":{"rendered":"lock\u548csynchronized\u533a\u522b"},"content":{"rendered":"\n<p>\u5728 Java \u4e2d\uff0c<code>synchronized<\/code> \u548c <code>Lock<\/code>\uff08\u901a\u5e38\u6307 <code>java.util.concurrent.locks.Lock<\/code> \u63a5\u53e3\u53ca\u5176\u5b9e\u73b0\u5982 <code>ReentrantLock<\/code>\uff09\u90fd\u662f<strong>\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65<\/strong>\u7684\u91cd\u8981\u624b\u6bb5\uff0c\u4f46\u5b83\u4eec\u5728\u4f7f\u7528\u65b9\u5f0f\u3001\u5e95\u5c42\u673a\u5236\u3001\u7075\u6d3b\u6027\u4e0e\u6027\u80fd\u65b9\u9762\u5b58\u5728\u660e\u663e\u5dee\u5f02\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\u57fa\u672c\u6982\u5ff5\u5bf9\u6bd4<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u6027<\/th><th><code>synchronized<\/code><\/th><th><code>Lock<\/code>\uff08\u5982 <code>ReentrantLock<\/code>\uff09<\/th><\/tr><\/thead><tbody><tr><td>\u6240\u5c5e\u5305<\/td><td><code>java<\/code> \u5173\u952e\u5b57\uff08JVM \u5185\u5efa\uff09<\/td><td><code>java.util.concurrent.locks<\/code> \u5305<\/td><\/tr><tr><td>\u63a7\u5236\u65b9\u5f0f<\/td><td>JVM \u5c42\u9762\u5b9e\u73b0<\/td><td>\u57fa\u4e8e AQS\uff08AbstractQueuedSynchronizer\uff09\u5b9e\u73b0<\/td><\/tr><tr><td>\u662f\u5426\u53ef\u91cd\u5165<\/td><td>\u2705 \u662f<\/td><td>\u2705 \u662f\uff08\u5982 <code>ReentrantLock<\/code>\uff09<\/td><\/tr><tr><td>\u53ef\u5426\u4e2d\u65ad\u9501\u7b49\u5f85<\/td><td>\u274c \u4e0d\u652f\u6301<\/td><td>\u2705 \u652f\u6301\uff08\u5982 <code>lockInterruptibly()<\/code>\uff09<\/td><\/tr><tr><td>\u662f\u5426\u53ef\u5c1d\u8bd5\u83b7\u53d6<\/td><td>\u274c \u4e0d\u652f\u6301<\/td><td>\u2705 <code>tryLock()<\/code> \u652f\u6301<\/td><\/tr><tr><td>\u662f\u5426\u53ef\u5b9a\u65f6\u83b7\u53d6<\/td><td>\u274c \u4e0d\u652f\u6301<\/td><td>\u2705 <code>tryLock(long, TimeUnit)<\/code> \u652f\u6301<\/td><\/tr><tr><td>\u516c\u5e73\u9501\u652f\u6301<\/td><td>\u274c \u4e0d\u652f\u6301<\/td><td>\u2705 \u652f\u6301\uff08\u6784\u9020\u51fd\u6570\u4e2d\u4f20\u5165 <code>true<\/code>\uff09<\/td><\/tr><tr><td>\u662f\u5426\u53ef\u7ed1\u5b9a\u6761\u4ef6<\/td><td>\u274c \u4e0d\u652f\u6301<\/td><td>\u2705 \u652f\u6301 <code>Condition<\/code> \u5bf9\u8c61\u5b9e\u73b0\u66f4\u7ec6\u7c92\u5ea6\u63a7\u5236<\/td><\/tr><tr><td>\u81ea\u52a8\u91ca\u653e<\/td><td>\u2705 \u662f\uff08\u81ea\u52a8\u91ca\u653e\u9501\uff09<\/td><td>\u274c \u5426\uff08\u5fc5\u987b\u624b\u52a8\u91ca\u653e\uff1a<code>unlock()<\/code>\uff09<\/td><\/tr><tr><td>\u8bfb\u5199\u9501\u652f\u6301<\/td><td>\u274c \u4e0d\u652f\u6301<\/td><td>\u2705 \u652f\u6301\uff08\u5982 <code>ReentrantReadWriteLock<\/code>\uff09<\/td><\/tr><tr><td>\u6027\u80fd\uff08JDK 1.5+\uff09<\/td><td>\u4e2d\u7b49<\/td><td>\u9ad8\uff08\u9002\u7528\u4e8e\u7ade\u4e89\u6fc0\u70c8\u573a\u666f\uff09<\/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\u793a\u4f8b\u5bf9\u6bd4<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u793a\u4f8b 1\ufe0f\u20e3\uff1a<code>synchronized<\/code><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public synchronized void doSomething() {\n    \/\/ \u4e34\u754c\u533a\n}<\/code><\/pre>\n\n\n\n<p>\u6216\u4f7f\u7528\u540c\u6b65\u5757\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public void doSomething() {\n    synchronized(this) {\n        \/\/ \u4e34\u754c\u533a\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u7279\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9501\u7684\u662f\u5bf9\u8c61\u6216\u7c7b<\/li>\n\n\n\n<li>\u8fdb\u5165\u548c\u9000\u51fa\u9501\u7531 JVM \u81ea\u52a8\u63a7\u5236<\/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\">\u793a\u4f8b 2\ufe0f\u20e3\uff1a<code>Lock<\/code>\uff08\u5982 <code>ReentrantLock<\/code>\uff09<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>private final ReentrantLock lock = new ReentrantLock();\n\npublic void doSomething() {\n    lock.lock();\n    try {\n        \/\/ \u4e34\u754c\u533a\n    } finally {\n        lock.unlock(); \/\/ \u975e\u5e38\u91cd\u8981\uff01\u5426\u5219\u4f1a\u6b7b\u9501\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u53ef\u7528\u7279\u6027\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (lock.tryLock(2, TimeUnit.SECONDS)) {\n    try {\n        \/\/ \u6210\u529f\u52a0\u9501\n    } finally {\n        lock.unlock();\n    }\n} else {\n    \/\/ \u672a\u80fd\u5728 2 \u79d2\u5185\u83b7\u53d6\u9501\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\">\u4e09\u3001\u5e95\u5c42\u539f\u7406\u5bf9\u6bd4<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u6027<\/th><th><code>synchronized<\/code><\/th><th><code>Lock<\/code><\/th><\/tr><\/thead><tbody><tr><td>\u5b9e\u73b0\u673a\u5236<\/td><td>JVM \u5185\u90e8 monitor\uff08monitorenter \/ monitorexit\uff09<\/td><td>\u57fa\u4e8e AQS\uff08AbstractQueuedSynchronizer\uff09<\/td><\/tr><tr><td>\u961f\u5217\u7c7b\u578b<\/td><td>\u5185\u90e8\u4e0d\u53ef\u89c1<\/td><td>CLH \u961f\u5217\u53ef\u63a7<\/td><\/tr><tr><td>\u963b\u585e\/\u5524\u9192\u673a\u5236<\/td><td>JVM <code>Object.wait()<\/code> \/ <code>notify()<\/code><\/td><td><code>LockSupport.park()<\/code> \/ <code>unpark()<\/code><\/td><\/tr><tr><td>\u53ef\u89c6\u5316\u63a7\u5236\u961f\u5217<\/td><td>\u274c \u4e0d\u53ef\u63a7<\/td><td>\u2705 \u53ef\u7ba1\u7406\u3001\u53ef\u8c03\u8bd5<\/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\u9002\u7528\u573a\u666f<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u573a\u666f<\/th><th>\u63a8\u8350\u5de5\u5177<\/th><\/tr><\/thead><tbody><tr><td>\u7b80\u5355\u540c\u6b65\u573a\u666f\uff08\u5982\u540c\u6b65\u65b9\u6cd5\uff09<\/td><td><code>synchronized<\/code> \u2705<\/td><\/tr><tr><td>\u9700\u4e2d\u65ad\u9501\u3001\u5b9a\u65f6\u9501\u5c1d\u8bd5\u7b49\u9ad8\u7ea7\u63a7\u5236<\/td><td><code>Lock<\/code> \u2705<\/td><\/tr><tr><td>\u8bfb\u591a\u5199\u5c11\u573a\u666f<\/td><td><code>ReentrantReadWriteLock<\/code> \u2705<\/td><\/tr><tr><td>\u6761\u4ef6\u53d8\u91cf\uff08\u5982 await\/signal\uff09<\/td><td><code>Condition<\/code> \u2705<\/td><\/tr><tr><td>\u9501\u7ade\u4e89\u6fc0\u70c8\u3001\u6027\u80fd\u8981\u6c42\u9ad8<\/td><td><code>ReentrantLock<\/code> \u2705<\/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\u3001Lock \u7279\u6709\u529f\u80fd\uff08synchronized \u505a\u4e0d\u5230\uff09<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u53ef\u4e2d\u65ad\u52a0\u9501<\/strong>\uff1a<code>lockInterruptibly()<\/code><\/li>\n\n\n\n<li><strong>\u5b9a\u65f6\u52a0\u9501<\/strong>\uff1a<code>tryLock(timeout, unit)<\/code><\/li>\n\n\n\n<li><strong>\u516c\u5e73\u9501\u7b56\u7565<\/strong>\uff1a\u907f\u514d\u9965\u997f\uff08\u5982 <code>ReentrantLock(true)<\/code>)<\/li>\n\n\n\n<li><strong>\u591a\u4e2a\u6761\u4ef6\u53d8\u91cf\u652f\u6301<\/strong>\uff1a\u4e00\u4e2a\u9501\u53ef\u914d\u591a\u4e2a <code>Condition<\/code>\uff0c\u66f4\u7075\u6d3b<\/li>\n\n\n\n<li><strong>\u8bfb\u5199\u9501\u5206\u79bb<\/strong>\uff1a\u5982 <code>ReentrantReadWriteLock<\/code> \u63d0\u4f9b\u8bfb\u5199\u5206\u79bb\u9501<\/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\">\u516d\u3001\u6027\u80fd\u5bf9\u6bd4\uff08\u73b0\u4ee3 JVM\uff09<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728 <strong>\u4f4e\u7ade\u4e89\u573a\u666f<\/strong>\uff0c<code>synchronized<\/code> \u548c <code>Lock<\/code> \u5dee\u8ddd\u4e0d\u5927<\/li>\n\n\n\n<li>\u5728 <strong>\u9ad8\u5e76\u53d1\u3001\u9ad8\u51b2\u7a81<\/strong> \u573a\u666f\u4e0b\uff0c<code>Lock<\/code> \u8868\u73b0\u66f4\u4f18\uff08\u56e0\u4e3a\u652f\u6301\u81ea\u65cb\u3001\u963b\u585e\u961f\u5217\u4f18\u5316\uff09<\/li>\n\n\n\n<li>JDK 1.6+ \u540e\u5f15\u5165\u4e86\u504f\u5411\u9501\u3001\u8f7b\u91cf\u7ea7\u9501\uff0csynchronized \u6027\u80fd\u63d0\u5347\u663e\u8457<\/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\">\u4e03\u3001\u603b\u7ed3\u5efa\u8bae<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5982\u679c\u4f60\u60f3\u2026<\/th><th>\u5efa\u8bae\u4f7f\u7528<\/th><\/tr><\/thead><tbody><tr><td>\u7b80\u5355\u52a0\u9501\u63a7\u5236\u3001\u65e0\u9700\u592a\u591a\u7075\u6d3b\u6027<\/td><td><code>synchronized<\/code> \u2705<\/td><\/tr><tr><td>\u9700\u8981\u7075\u6d3b\u5730\u5904\u7406\u9501\u7684\u83b7\u53d6\u3001\u4e2d\u65ad\u3001\u5b9a\u65f6\u3001\u961f\u5217\u7ba1\u7406\u7b49<\/td><td><code>Lock<\/code> \u2705<\/td><\/tr><tr><td>\u5b9e\u73b0\u590d\u6742\u540c\u6b65\u5668\uff08\u5982\u4fe1\u53f7\u91cf\u3001\u6805\u680f\u3001\u5c4f\u969c\uff09<\/td><td>\u81ea\u5b9a\u4e49 AQS \u2705<\/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\">\u516b\u3001\u5b98\u65b9\u4e0e\u6743\u5a01\u8d44\u6e90\u63a8\u8350<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/util\/concurrent\/locks\/ReentrantLock.html\">\ud83d\udd17 ReentrantLock (Java SE 8 API)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.oracle.com\/javase\/specs\/jls\/se8\/html\/jls-14.html#jls-14.19\">\ud83d\udd17 synchronized (Java Language Spec)<\/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\">\ud83d\udd17 JDK\u6e90\u7801\u5206\u6790\uff1aAQS<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/tech.meituan.com\/2019\/12\/05\/aqs-theory-and-apply.html\">\u7f8e\u56e2\u6280\u672f\u535a\u5ba2\uff1a\u5e76\u53d1\u9501\u8bbe\u8ba1\u601d\u8def\u4e0e\u4f18\u5316\u5b9e\u8df5<\/a><\/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>\u5728 Java \u4e2d\uff0csynchronized \u548c Lock\uff08\u901a\u5e38\u6307 java.util.concurrent.l [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3847,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-3842","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\/3842","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=3842"}],"version-history":[{"count":2,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3842\/revisions"}],"predecessor-version":[{"id":3846,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3842\/revisions\/3846"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3847"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}