{"id":3075,"date":"2024-03-29T16:46:34","date_gmt":"2024-03-29T08:46:34","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=3075"},"modified":"2024-12-15T20:05:26","modified_gmt":"2024-12-15T12:05:26","slug":"java-locks%e7%b1%bb%ef%bc%9a%e5%b9%b6%e5%8f%91%e7%bc%96%e7%a8%8b%e7%9a%84%e5%88%a9%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=3075","title":{"rendered":"Java Locks \u7c7b\uff1a\u5e76\u53d1\u7f16\u7a0b\u7684\u5229\u5668"},"content":{"rendered":"\n<p>\u5728 Java \u7f16\u7a0b\u4e2d\uff0c\u5b9e\u73b0\u5e76\u53d1\u64cd\u4f5c\u662f\u975e\u5e38\u5e38\u89c1\u7684\u9700\u6c42\uff0c\u800c Locks \u7c7b\u5c31\u662f\u5728\u8fd9\u4e2a\u80cc\u666f\u4e0b\u5e94\u8fd0\u800c\u751f\u7684\u3002Locks \u7c7b\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u52a0\u7075\u6d3b\u548c\u5f3a\u5927\u7684\u7ebf\u7a0b\u540c\u6b65\u673a\u5236\uff0c\u76f8\u6bd4\u4e8e\u4f20\u7edf\u7684 synchronized \u5173\u952e\u5b57\uff0c\u5b83\u5177\u6709\u66f4\u591a\u7684\u529f\u80fd\u548c\u66f4\u9ad8\u7684\u6269\u5c55\u6027\u3002\u672c\u6587\u5c06\u4ecb\u7ecd Locks \u7c7b\u7684\u6838\u5fc3\u529f\u80fd\u3001\u7c7b\u7ee7\u627f\u5173\u7cfb\u3001\u5b9e\u73b0\u539f\u7406\u4ee5\u53ca\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u548c\u4f7f\u7528\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e00\u3001Locks \u7c7b\u7684\u6838\u5fc3\u529f\u80fd<\/h5>\n\n\n\n<p>Locks \u7c7b\u63d0\u4f9b\u4e86\u4e00\u79cd\u663e\u5f0f\u7684\u9501\u673a\u5236\uff0c\u5b83\u5141\u8bb8\u7a0b\u5e8f\u5458\u624b\u52a8\u63a7\u5236\u7ebf\u7a0b\u7684\u52a0\u9501\u548c\u89e3\u9501\u64cd\u4f5c\uff0c\u4ece\u800c\u5b9e\u73b0\u66f4\u7075\u6d3b\u7684\u7ebf\u7a0b\u540c\u6b65\u3002Locks \u7c7b\u7684\u6838\u5fc3\u63a5\u53e3\u662f <code>java.util.concurrent.locks.Lock<\/code>\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u5b9e\u73b0\u7c7b\u662f <code>ReentrantLock<\/code>\u3002Locks \u7c7b\u63d0\u4f9b\u4e86\u4ee5\u4e0b\u4e3b\u8981\u529f\u80fd\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u624b\u52a8\u63a7\u5236\u9501<\/strong>\uff1a\u4e0e synchronized \u5173\u952e\u5b57\u4e0d\u540c\uff0cLocks \u7c7b\u5141\u8bb8\u7a0b\u5e8f\u5458\u624b\u52a8\u63a7\u5236\u9501\u7684\u83b7\u53d6\u548c\u91ca\u653e\uff0c\u4ece\u800c\u66f4\u7075\u6d3b\u5730\u63a7\u5236\u7ebf\u7a0b\u4e4b\u95f4\u7684\u5e76\u53d1\u8bbf\u95ee\u3002<\/li>\n\n\n\n<li><strong>\u53ef\u91cd\u5165\u6027<\/strong>\uff1a\u4e0e synchronized \u5173\u952e\u5b57\u4e00\u6837\uff0cLocks \u7c7b\u7684\u5b9e\u73b0\u7c7b\u901a\u5e38\u652f\u6301\u53ef\u91cd\u5165\u6027\uff0c\u5373\u540c\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u591a\u6b21\u83b7\u53d6\u540c\u4e00\u4e2a\u9501\uff0c\u800c\u4e0d\u4f1a\u53d1\u751f\u6b7b\u9501\u3002<\/li>\n\n\n\n<li><strong>\u6761\u4ef6\u53d8\u91cf\u652f\u6301<\/strong>\uff1aLocks \u7c7b\u63d0\u4f9b\u4e86\u6761\u4ef6\u53d8\u91cf\uff08Condition\uff09\u7684\u652f\u6301\uff0c\u53ef\u4ee5\u901a\u8fc7\u6761\u4ef6\u53d8\u91cf\u5b9e\u73b0\u590d\u6742\u7684\u7ebf\u7a0b\u901a\u4fe1\u548c\u540c\u6b65\u3002<\/li>\n\n\n\n<li><strong>\u8d85\u65f6\u83b7\u53d6\u9501<\/strong>\uff1aLocks \u7c7b\u7684\u9501\u83b7\u53d6\u65b9\u6cd5\u5141\u8bb8\u6307\u5b9a\u8d85\u65f6\u65f6\u95f4\uff0c\u5982\u679c\u5728\u6307\u5b9a\u65f6\u95f4\u5185\u65e0\u6cd5\u83b7\u53d6\u5230\u9501\uff0c\u7ebf\u7a0b\u53ef\u4ee5\u653e\u5f03\u83b7\u53d6\u9501\u800c\u6267\u884c\u5176\u4ed6\u903b\u8f91\uff0c\u907f\u514d\u7ebf\u7a0b\u957f\u65f6\u95f4\u963b\u585e\u3002<\/li>\n<\/ol>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e8c\u3001Locks \u7c7b\u7684\u7ee7\u627f\u5173\u7cfb<\/h5>\n\n\n\n<p>Locks \u7c7b\u7684\u7ee7\u627f\u5173\u7cfb\u6bd4\u8f83\u7b80\u5355\uff0c\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u7c7b\u548c\u63a5\u53e3\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>java.util.concurrent.locks.Lock<\/code>\uff1aLocks \u7c7b\u7684\u6838\u5fc3\u63a5\u53e3\uff0c\u5b9a\u4e49\u4e86\u9501\u7684\u57fa\u672c\u64cd\u4f5c\u65b9\u6cd5\u3002<\/li>\n\n\n\n<li><code>java.util.concurrent.locks.ReentrantLock<\/code>\uff1aLocks \u7c7b\u6700\u5e38\u7528\u7684\u5b9e\u73b0\u7c7b\uff0c\u652f\u6301\u53ef\u91cd\u5165\u6027\uff0c\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u529f\u80fd\u3002<\/li>\n\n\n\n<li>\u5176\u4ed6\u5b9e\u73b0\u7c7b\uff1a\u9664\u4e86 ReentrantLock \u5916\uff0cLocks \u7c7b\u8fd8\u6709\u4e00\u4e9b\u5176\u4ed6\u7684\u5b9e\u73b0\u7c7b\uff0c\u5982 <code>ReentrantReadWriteLock.ReadLock<\/code> \u548c <code>ReentrantReadWriteLock.WriteLock<\/code>\uff0c\u7528\u4e8e\u652f\u6301\u8bfb\u5199\u9501\u673a\u5236\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e09\u3001Locks \u7c7b\u7684\u5b9e\u73b0\u539f\u7406<\/h5>\n\n\n\n<p>Locks \u7c7b\u7684\u5b9e\u73b0\u539f\u7406\u4e3b\u8981\u57fa\u4e8e Java \u4e2d\u7684\u540c\u6b65\u5668\uff08AbstractQueuedSynchronizer\uff0c\u7b80\u79f0 AQS\uff09\u3002AQS \u662f\u4e00\u4e2a\u7528\u4e8e\u6784\u5efa\u9501\u548c\u540c\u6b65\u5668\u7684\u6846\u67b6\uff0c\u5b83\u63d0\u4f9b\u4e86\u57fa\u672c\u7684\u7ebf\u7a0b\u963b\u585e\u548c\u5524\u9192\u673a\u5236\uff0cLocks \u7c7b\u901a\u8fc7 AQS \u5b9e\u73b0\u4e86\u9501\u7684\u57fa\u672c\u529f\u80fd\u3002\u5728\u5177\u4f53\u7684\u5b9e\u73b0\u4e2d\uff0cLocks \u7c7b\u4f1a\u4f7f\u7528 CAS\uff08Compare and Swap\uff09\u7b49\u5e95\u5c42\u673a\u5236\u6765\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u9501\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u56db\u3001Locks \u7c7b\u7684\u793a\u4f8b\u7528\u6cd5<\/h5>\n\n\n\n<p>\u4e0b\u9762\u901a\u8fc7\u4e24\u4e2a\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u6765\u4ecb\u7ecd Locks \u7c7b\u7684\u4f7f\u7528\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<p>\u573a\u666f\u4e00\uff1a\u591a\u7ebf\u7a0b\u6587\u4ef6\u4e0b\u8f7d<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-7182f1c04f8e3d45fdfa132856bfe3b0\"><code>import java.util.concurrent.locks.Lock;\nimport java.util.concurrent.locks.ReentrantLock;\n\npublic class FileDownloader {\n    private Lock lock = new ReentrantLock();\n\n    public void download(String fileUrl) {\n        lock.lock();\n        try {\n            \/\/ \u4e0b\u8f7d\u6587\u4ef6\u7684\u5177\u4f53\u903b\u8f91\n        } finally {\n            lock.unlock();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u591a\u7ebf\u7a0b\u6587\u4ef6\u4e0b\u8f7d\u7684\u573a\u666f\u4e2d\uff0c\u591a\u4e2a\u7ebf\u7a0b\u9700\u8981\u5171\u4eab\u4e00\u4e2a\u6587\u4ef6\u4e0b\u8f7d\u5668\u5bf9\u8c61\uff0c\u5e76\u53d1\u5730\u4e0b\u8f7d\u591a\u4e2a\u6587\u4ef6\u3002\u4e3a\u4e86\u786e\u4fdd\u4e0b\u8f7d\u8fc7\u7a0b\u7684\u7ebf\u7a0b\u5b89\u5168\u6027\uff0c\u53ef\u4ee5\u4f7f\u7528 ReentrantLock \u6765\u63a7\u5236\u6587\u4ef6\u4e0b\u8f7d\u7684\u4ee3\u7801\u5757\uff0c\u4fdd\u8bc1\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u5728\u4e0b\u8f7d\u6587\u4ef6\u3002<\/p>\n\n\n\n<p>\u573a\u666f\u4e8c\uff1a\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u5f0f<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-d0ed3140c4d5e04be0471ba6d24ed107\"><code>import java.util.concurrent.locks.Condition;\nimport java.util.concurrent.locks.Lock;\nimport java.util.concurrent.locks.ReentrantLock;\n\npublic class Buffer {\n    private final Lock lock = new ReentrantLock();\n    private final Condition notFull = lock.newCondition();\n    private final Condition notEmpty = lock.newCondition();\n    private final Object&#91;] items = new Object&#91;100];\n    private int count, putIndex, takeIndex;\n\n    public void put(Object x) throws InterruptedException {\n        lock.lock();\n        try {\n            while (count == items.length)\n                notFull.await();\n            items&#91;putIndex] = x;\n            if (++putIndex == items.length) putIndex = 0;\n            ++count;\n            notEmpty.signal();\n        } finally {\n            lock.unlock();\n        }\n    }\n\n    public Object take() throws InterruptedException {\n        lock.lock();\n        try {\n            while (count == 0)\n                notEmpty.await();\n            Object x = items&#91;takeIndex];\n            if (++takeIndex == items.length) takeIndex = 0;\n            --count;\n            notFull.signal();\n            return x;\n        } finally {\n            lock.unlock();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u5f0f\u4e2d\uff0c\u751f\u4ea7\u8005\u7ebf\u7a0b\u8d1f\u8d23\u5411\u7f13\u51b2\u533a\u4e2d\u653e\u5165\u6570\u636e\uff0c\u800c\u6d88\u8d39\u8005\u7ebf\u7a0b\u8d1f\u8d23\u4ece\u7f13\u51b2\u533a\u4e2d\u53d6\u51fa\u6570\u636e\u3002\u4e3a\u4e86\u907f\u514d\u751f\u4ea7\u8005\u548c\u6d88\u8d39\u8005\u4e4b\u95f4\u7684\u7ade\u4e89\u6761\u4ef6\uff0c\u53ef\u4ee5\u4f7f\u7528 ReentrantLock \u548c Condition \u6765\u5b9e\u73b0\u5bf9\u7f13\u51b2\u533a\u7684\u5b89\u5168\u8bbf\u95ee\u548c\u7ebf\u7a0b\u901a\u4fe1\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u56db\u3001\u4f7f\u7528\u6ce8\u610f\u4e8b\u9879<\/h5>\n\n\n\n<p>\u5728\u4f7f\u7528 Locks \u7c7b\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u53ca\u65f6\u91ca\u653e\u9501<\/strong>\uff1a\u786e\u4fdd\u5728\u9501\u4fdd\u62a4\u7684\u4ee3\u7801\u5757\u4e2d\uff0c\u53ca\u65f6\u91ca\u653e\u9501\uff0c\u4ee5\u907f\u514d\u53d1\u751f\u6b7b\u9501\u6216\u7ebf\u7a0b\u957f\u65f6\u95f4\u963b\u585e\u3002<\/li>\n\n\n\n<li><strong>\u5f02\u5e38\u5904\u7406<\/strong>\uff1a\u5728\u4f7f\u7528 Locks \u7c7b\u65f6\uff0c\u9700\u8981\u6b63\u786e\u5904\u7406\u53ef\u80fd\u629b\u51fa\u7684\u5f02\u5e38\uff0c\u786e\u4fdd\u5728\u53d1\u751f\u5f02\u5e38\u65f6\u80fd\u591f\u6b63\u786e\u91ca\u653e\u9501\u3002<\/li>\n\n\n\n<li><strong>\u907f\u514d\u5fd8\u8bb0\u91ca\u653e\u9501<\/strong>\uff1a\u4f7f\u7528 try-finally \u6216 try-with-resources \u7b49\u65b9\u5f0f\u786e\u4fdd\u5728\u4efb\u4f55\u60c5\u51b5\u4e0b\u90fd\u80fd\u591f\u6b63\u786e\u91ca\u653e\u9501\uff0c\u907f\u514d\u5fd8\u8bb0\u91ca\u653e\u9501\u800c\u5bfc\u81f4\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u3002<\/li>\n\n\n\n<li><strong>\u6027\u80fd\u8003\u8651<\/strong>\uff1a\u5c3d\u91cf\u907f\u514d\u8fc7\u591a\u5730\u4f7f\u7528\u9501\uff0c\u56e0\u4e3a\u9501\u7684\u7ade\u4e89\u4f1a\u5f71\u54cd\u7a0b\u5e8f\u7684\u6027\u80fd\uff0c\u5e94\u6839\u636e\u5177\u4f53\u60c5\u51b5\u8fdb\u884c\u6743\u8861\u548c\u4f18\u5316\u3002<\/li>\n<\/ol>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e94\u3001\u7ed3\u8bed<\/h5>\n\n\n\n<p>Java Locks \u7c7b\u4e3a\u5e76\u53d1\u7f16\u7a0b\u63d0\u4f9b\u4e86\u4e00\u79cd\u5f3a\u5927\u800c\u7075\u6d3b\u7684\u7ebf\u7a0b\u540c\u6b65\u673a\u5236\uff0c\u901a\u8fc7\u624b\u52a8\u63a7\u5236\u9501\u7684\u83b7\u53d6\u548c\u91ca\u653e\uff0c\u53ef\u4ee5\u66f4\u597d\u5730\u63a7\u5236\u7ebf\u7a0b\u4e4b\u95f4\u7684\u5e76\u53d1\u8bbf\u95ee\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u9700\u8981\u6839\u636e\u5177\u4f53\u7684\u573a\u666f\u9009\u62e9\u5408\u9002\u7684\u9501\u7c7b\u578b\uff0c\u5e76\u6ce8\u610f\u9075\u5faa\u4f7f\u7528\u9501\u7684\u6700\u4f73\u5b9e\u8df5\uff0c\u4ee5\u786e\u4fdd\u7a0b\u5e8f\u7684\u7ebf\u7a0b\u5b89\u5168\u6027\u548c\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Java \u7f16\u7a0b\u4e2d\uff0c\u5b9e\u73b0\u5e76\u53d1\u64cd\u4f5c\u662f\u975e\u5e38\u5e38\u89c1\u7684\u9700\u6c42\uff0c\u800c Locks \u7c7b\u5c31\u662f\u5728\u8fd9\u4e2a\u80cc\u666f\u4e0b\u5e94\u8fd0\u800c\u751f\u7684\u3002Locks  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59],"tags":[16],"class_list":["post-3075","post","type-post","status-publish","format-standard","hentry","category-59","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java Locks \u7c7b\uff1a\u5e76\u53d1\u7f16\u7a0b\u7684\u5229\u5668<\/title>\n<meta name=\"description\" content=\"Locks \u7c7b\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u52a0\u7075\u6d3b\u548c\u5f3a\u5927\u7684\u7ebf\u7a0b\u540c\u6b65\u673a\u5236\uff0c\u76f8\u6bd4\u4e8e\u4f20\u7edf\u7684 synchronized \u5173\u952e\u5b57\uff0c\u5b83\u5177\u6709\u66f4\u591a\u7684\u529f\u80fd\u548c\u66f4\u9ad8\u7684\u6269\u5c55\u6027\u3002\u672c\u6587\u5c06\u4ecb\u7ecd Locks \u7c7b\u7684\u6838\u5fc3\u529f\u80fd\u3001\u7c7b\u7ee7\u627f\u5173\u7cfb\u3001\u5b9e\u73b0\u539f\u7406\u4ee5\u53ca\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.talktop.cn\/?p=3075\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.talktop.cn\/?p=3075#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.talktop.cn\/?p=3075\"},\"author\":{\"name\":\"AI\u98ce\u5411\u6807\",\"@id\":\"https:\/\/www.talktop.cn\/#\/schema\/person\/25908db5f654913a22bc38d48fad71ab\"},\"headline\":\"Java Locks 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