{"id":823,"date":"2020-05-27T15:39:43","date_gmt":"2020-05-27T07:39:43","guid":{"rendered":"http:\/\/prayerlaputa.com\/?p=823"},"modified":"2020-06-18T17:04:34","modified_gmt":"2020-06-18T09:04:34","slug":"java%e5%b9%b6%e5%8f%91%e4%b9%8b%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90volatile%e5%85%b3%e9%94%ae%e5%ad%97","status":"publish","type":"post","link":"http:\/\/prayerlaputa.com\/?p=823","title":{"rendered":"Java\u5e76\u53d1\u4e4b\u6df1\u5165\u89e3\u6790volatile\u5173\u952e\u5b57"},"content":{"rendered":"<p>\u4ece\u4e00\u9053\u9762\u8bd5\u9898\u8bb2\u8d77\uff1a<strong>\u91c7\u7528DCL\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u65f6\uff0c\u662f\u5426\u9700\u8981\u52a0volatile\u5173\u952e\u5b57\uff1f\u4e3a\u4ec0\u4e48\uff1f<\/strong><\/p>\n<h2 id=\"%E6%9C%89%E5%85%B3%E5%8D%95%E4%BE%8B%E6%A8%A1%E5%BC%8F\" class=\"mume-header\">\u6709\u5173\u5355\u4f8b\u6a21\u5f0f<\/h2>\n<p>\u6211\u4eec\u5728\u7f51\u4e0a\u641c\u5982\u4f55\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u65f6\uff0c\u5e16\u5b50\u5f80\u5f80\u7ed9\u51fa\u591a\u79cd\u5b9e\u73b0\uff1a\u997f\u6c49\u6a21\u5f0f\u3001\u61d2\u6c49\u6a21\u5f0f\u3001\u53cc\u91cd\u9501\u61d2\u6c49\u6a21\u5f0f\uff08\u53cc\u91cd\u9501\u68c0\u67e5\uff0cdouble check lock\uff0c\u7ecf\u5e38\u7b80\u5199\u505aDCL\uff09\u3001\u9759\u6001\u5185\u90e8\u7c7b\u6a21\u5f0f\u3001\u679a\u4e3e\u6a21\u5f0f\u7b49\u3002<\/p>\n<p>\u6b64\u5904\u53ef\u4ee5\u53c2\u8003\u00a0<a href=\"https:\/\/blog.csdn.net\/mnb65482\/article\/details\/80458571\">\u6df1\u5165\u7406\u89e3\u5355\u4f8b\u6a21\u5f0f\uff1a\u9759\u6001\u5185\u90e8\u7c7b\u5355\u4f8b\u539f\u7406<\/a>\u00a0\u8fd9\u7bc7\u6587\u7ae0\u3002<\/p>\n<p>\u987a\u5e26\u63d0\u4e00\u53e5\uff0c\u300aJava\u5e76\u53d1\u7f16\u7a0b\u7684\u827a\u672f\u300b\uff08\u65b9\u817e\u98de\uff09\u7b2c3\u7ae0\u6709\u8ba8\u8bba\u8fc7DCL\u3001\u9759\u6001\u5185\u90e8\u7c7b\u8fd9\u4e24\u79cd\u5b9e\u73b0\u65b9\u5f0f\uff0c\u5efa\u8bae\u53bb\u8bfb\u4e00\u8bfb\u3002<!--more--><\/p>\n<p>\u5148\u8bf4\u7ed3\u8bba\uff1a<strong>DCL\u5b9e\u73b0\u5355\u4f8b\uff0c\u5fc5\u987b\u52a0volatile!<\/strong><\/p>\n<p>\u81f3\u4e8e\u4e3a\u4f55\uff0c\u9996\u5148\u6211\u4eec\u9700\u8981\u7406\u89e3volatile\u7684\u8bed\u4e49\u3002<\/p>\n<h2 id=\"volatile%E7%9A%84%E8%AF%AD%E4%B9%89\" class=\"mume-header\">volatile\u7684\u8bed\u4e49<\/h2>\n<p>\u76ee\u524d\u6211\u4eec\u6b63\u5728\u4f7f\u7528\u7684Java\u7248\u672c\u4e2d\uff0c\u5bf9\u4e8e<code>volatile<\/code>\u8bed\u4e49\u7684\u5b9a\u4e49\uff0c\u4e3b\u8981\u91c7\u7528 JSR-133\u4e2d\u7684\u5b9a\u4e49\u3002<\/p>\n<blockquote><p>Oracle JSR-133\u6587\u6863\uff1a<a href=\"https:\/\/download.oracle.com\/otndocs\/jcp\/memory_model-1.0-pfd-spec-oth-JSpec\/\">\u82f1\u6587\u539f\u7248<\/a>\u00a0<a href=\"http:\/\/ifeve.com\/jsr133-cn\/\">\u4e2d\u6587\u7ffb\u8bd1\u7248<\/a><\/p><\/blockquote>\n<p>JSR-133\u5728\u5bf9JLS\u539f\u59cb\u89c4\u8303\u7684\u6539\u53d8\u4e2d\uff0c\u6709\u4e24\u5904\u6700\u6709\u53ef\u80fd\u8981\u6c42JVM\u5b9e\u73b0\u4e5f\u505a\u51fa\u76f8\u5e94\u7684\u53d8\u52a8\uff1a<\/p>\n<blockquote><p>\u52a0\u5f3a\u4e86volatile\u53d8\u91cf\u7684\u8bed\u4e49\uff0c\u9700\u8981\u6709acquire\u548crelease\u8bed\u4e49\u3002\u5728\u539f\u59cb\u7684\u89c4\u8303\u4e2d\uff0cvolatile\u53d8\u91cf\u7684\u8bbf\u95ee\u548c\u975evolatile\u53d8\u91cf\u7684\u8bbf\u95ee\u4e4b\u95f4\u53ef\u4ee5\u81ea\u7531\u5730\u91cd\u6392\u5e8f\u3002<br \/>\n\u52a0\u5f3a\u4e86final\u5b57\u6bb5\u7684\u8bed\u4e49\uff0c\u65e0\u9700\u663e\u5f0f\u5730\u540c\u6b65\uff0c\u4e0d\u53ef\u53d8\u5bf9\u8c61\u4e5f\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u8fd9\u53ef\u80fd\u9700\u8981\u5728\u7ed9final\u5b57\u6bb5\u8d4b\u503c\u7684\u90a3\u4e9b\u6784\u9020\u5668\u7684\u672b\u5c3e\u52a0\u4e0astore-store\u5c4f\u969c\u3002<\/p><\/blockquote>\n<h3 id=\"volatile%E7%9A%84%E5%86%85%E5%AD%98%E8%AF%AD%E4%B9%89\" class=\"mume-header\">volatile\u7684\u5185\u5b58\u8bed\u4e49<\/h3>\n<p>CPU\u7f13\u5b58\u7ea7\u522b<\/p>\n<blockquote><p>happens-before\u5bf9volatile\u89c4\u5219\u7684\u5b9a\u4e49 : volatile\u53d8\u91cf\u7684\u5199\uff0c\u5148\u53d1\u751f\u4e8e\u540e\u7eed\u5bf9\u8fd9\u4e2a\u53d8\u91cf\u7684\u8bfb.<br \/>\n\u8fd9\u53e5\u8bdd\u7684\u542b\u4e49\u6709\u4e24\u5c42:<br \/>\nvolatile \u7684\u5199\u64cd\u4f5c, \u9700\u8981\u5c06\u7ebf\u7a0b\u672c\u5730\u5185\u5b58\u503c,\u7acb\u9a6c\u5237\u65b0\u5230 \u4e3b\u5185\u5b58\u7684\u5171\u4eab\u53d8\u91cf\u4e2d.<br \/>\nvolatile \u7684\u8bfb\u64cd\u4f5c, \u9700\u8981\u4ece\u4e3b\u5185\u5b58\u7684\u5171\u4eab\u53d8\u91cf\u4e2d\u8bfb\u53d6,\u66f4\u65b0\u672c\u5730\u5185\u5b58\u53d8\u91cf\u7684\u503c.<br \/>\n\u7531\u6b64\u5f15\u51fa volatile \u7684\u5185\u5b58\u8bed\u4e49.<br \/>\n\u5f53\u5199\u4e00\u4e2avolatile\u53d8\u91cf\u65f6\uff0cJMM\u4f1a\u628a\u8be5\u7ebf\u7a0b\u5bf9\u5e94\u7684\u672c\u5730\u5185\u5b58\u4e2d\u7684\u5171\u4eab\u53d8\u91cf\u503c\u5237\u65b0\u5230\u4e3b\u5185\u5b58.<br \/>\n\u5f53\u8bfb\u4e00\u4e2avolatile\u53d8\u91cf\u65f6\uff0cJMM\u4f1a\u628a\u8be5\u7ebf\u7a0b\u5bf9\u5e94\u7684\u672c\u5730\u5185\u5b58\u7f6e\u4e3a\u65e0\u6548\u3002\u7ebf\u7a0b\u63a5\u4e0b\u6765\u5c06\u4ece\u4e3b\u5185\u5b58\u4e2d\u8bfb\u53d6\u5171\u4eab\u53d8\u91cf,\u5e76\u66f4\u65b0\u672c\u5730\u5185\u5b58\u7684\u503c.<\/p><\/blockquote>\n<p>\u6ce8\uff1a\u5f15\u81eahttps:\/\/www.jianshu.com\/p\/9e467de97216<\/p>\n<h3 id=\"%E9%80%9A%E4%BF%97%E4%B8%80%E7%82%B9\" class=\"mume-header\">\u901a\u4fd7\u4e00\u70b9<\/h3>\n<p>\u7b80\u5355\u6765\u8bb2\uff0c\u76ee\u524d<code>volatile<\/code>\u5173\u952e\u5b57\u4e3b\u8981\u7684\u4f5c\u7528\u662f\uff1a<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ol>\n<li>\u5728\u591a\u7ebf\u7a0b\u8bbf\u95ee\uff0c\u4fdd\u8bc1\u88abvolatile\u4fee\u9970\u53d8\u91cf\u7684\u53ef\u89c1\u6027<\/li>\n<\/ol>\n<ol start=\"2\">\n<li>\u7981\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h3 id=\"%E5%88%86%E6%9E%90dcl%E4%BB%A3%E7%A0%81\" class=\"mume-header\">\u5206\u6790DCL\u4ee3\u7801<\/h3>\n<p>\u4e00\u4e2a\u5178\u578b\u7684DCL\u4ee3\u7801\u5982\u4e0b\uff08\u6ca1\u52a0volatile\u3001\u6709\u95ee\u9898\u7684\u7248\u672c\uff09\uff1a<\/p>\n<pre class=\"language-java\" data-role=\"codeBlock\" data-info=\"java\"><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SingleTon<\/span><span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token comment\">\/\/\u6ca1\u52a0volatile\u3001\u6709\u95ee\u9898\u7684\u7248\u672c<\/span>\r\n  <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">SingleTon<\/span>  INSTANCE <span class=\"token operator\">=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span>\r\n  <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">SingleTon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n  <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">SingleTon<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span>\r\n      <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>INSTANCE <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span>\r\n          <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">SingleTon<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span>\r\n             <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>INSTANCE <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span> \r\n               INSTANCE <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">SingleTon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n             <span class=\"token punctuation\">}<\/span> \r\n          <span class=\"token punctuation\">}<\/span>\r\n          <span class=\"token keyword\">return<\/span> INSTANCE<span class=\"token punctuation\">;<\/span> \r\n    <span class=\"token punctuation\">}<\/span> \r\n  <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/pre>\n<p>\u6709\u95ee\u9898\u5730\u65b9\u662f\u8fd9\u91cc\uff1a<\/p>\n<pre class=\"language-java\" data-role=\"codeBlock\" data-info=\"java\">INSTANCE <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">SingleTon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/pre>\n<p>\u8fd9\u6761\u8bed\u53e5\u7f16\u8bd1\u6210\u5b57\u8282\u7801\u6307\u4ee4\u540e\uff0c\u5b9e\u9645\u5206\u4e0b\u97623\u4e2a\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li>\u5728\u5806\u5185\u5b58\u5f00\u8f9f\u5185\u5b58\u7a7a\u95f4\u3002<\/li>\n<li>\u5728\u5806\u5185\u5b58\u4e2d\u5b9e\u4f8b\u5316SingleTon\u91cc\u9762\u7684\u5404\u4e2a\u53c2\u6570\u3002<\/li>\n<li>\u628a\u5bf9\u8c61\u6307\u5411\u5806\u5185\u5b58\u7a7a\u95f4\u3002<\/li>\n<\/ol>\n<p>\u7531\u4e8eJVM\u5b58\u5728\u4e71\u5e8f\u6267\u884c\u529f\u80fd\uff0c\u6240\u4ee5\u53ef\u80fd\u7ebf\u7a0bA\u57282\u8fd8\u6ca1\u6267\u884c\u65f6\u5c31\u5148\u6267\u884c\u4e863\uff0c\u5982\u679c\u6b64\u65f6\u518d\u88ab\u5207\u6362\u5230\u7ebf\u7a0bB\u4e0a\uff0c\u7531\u4e8e\u6267\u884c\u4e863\uff0cINSTANCE \u5df2\u7ecf\u975e\u7a7a\u4e86\uff0c\u4f1a\u88ab\u76f4\u63a5\u62ff\u51fa\u6765\u7528\uff0c\u8fd9\u6837\u7684\u8bdd\uff0c\u5c31\u4f1a\u51fa\u73b0\u5f02\u5e38\u3002\u8fd9\u4e2a\u5c31\u662f\u8457\u540d\u7684DCL\u5931\u6548\u95ee\u9898\u3002<\/p>\n<p>\u5728JSR-133\uff08JDK 1.5\u4e2d\u5b9e\u73b0\uff09\u4e4b\u540e\uff0c\u5b98\u65b9\u4e5f\u53d1\u73b0\u4e86\u8fd9\u4e2a\u95ee\u9898\uff0c\u589e\u5f3a\u4e86volatile\uff0c\u53ea\u8981\u5b9a\u4e49\u4e3a<code>private volatile static SingleTon INSTANCE = null;<\/code>\u5c31\u53ef\u89e3\u51b3DCL\u5931\u6548\u95ee\u9898\u3002volatile\u786e\u4fddINSTANCE\u6bcf\u6b21\u5747\u5728\u4e3b\u5185\u5b58\u4e2d\u8bfb\u53d6\uff0c\u8fd9\u6837\u867d\u7136\u4f1a\u727a\u7272\u4e00\u70b9\u6548\u7387\uff0c\u4f46\u4e5f\u65e0\u4f24\u5927\u96c5\u3002<\/p>\n<h2 id=\"volatile%E5%A6%82%E4%BD%95%E4%BF%9D%E8%AF%81%E5%8F%AF%E8%A7%81%E6%80%A7%E5%B9%B6%E7%A6%81%E6%AD%A2%E6%8C%87%E4%BB%A4%E9%87%8D%E6%8E%92%E5%BA%8F\" class=\"mume-header\">volatile\u5982\u4f55\u4fdd\u8bc1\u53ef\u89c1\u6027\u5e76\u7981\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f\uff1f<\/h2>\n<h3 id=\"%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86\" class=\"mume-header\">\u57fa\u7840\u77e5\u8bc6<\/h3>\n<p>Java\u7a0b\u5e8f\u6267\u884c\uff1a<\/p>\n<div class=\"mermaid\">\n<div><img loading=\"lazy\" class=\"alignnone size-medium wp-image-826\" src=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/Java\u7a0b\u5e8f\u6267\u884c-300x46.png\" alt=\"\" width=\"300\" height=\"46\" srcset=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/Java\u7a0b\u5e8f\u6267\u884c-300x46.png 300w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/Java\u7a0b\u5e8f\u6267\u884c-768x117.png 768w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/Java\u7a0b\u5e8f\u6267\u884c.png 811w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/div>\n<div><\/div>\n<\/div>\n<p>JVM\u6267\u884c\u5b57\u8282\u7801\u65f6\uff0c\u53ef\u80fd\u53d1\u751f\u6307\u4ee4\u91cd\u6392\u5e8f\uff0c\u4e71\u5e8f\u6267\u884c\u3002\u4e0a\u9762\u4e0d\u52a0volatile\u7684DCL\u91cd\u6392\u5c31\u662f\u4e00\u4e2a\u4f8b\u5b50\u3002<\/p>\n<p>\u9700\u8981\u5206\u591a\u4e2a\u5c42\u6b21\u6765\u7406\u89e3\uff1a<\/p>\n<h4 id=\"1-%E5%9C%A8java%E5%AD%97%E8%8A%82%E7%A0%81%E5%B1%82%E9%9D%A2\" class=\"mume-header\">1. \u5728Java\u5b57\u8282\u7801\u5c42\u9762<\/h4>\n<p>\u5b57\u8282\u7801\u6587\u4ef6\u7ed3\u6784<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-medium wp-image-827\" src=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u7ed3\u6784-300x297.png\" alt=\"\" width=\"300\" height=\"297\" srcset=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u7ed3\u6784-300x297.png 300w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u7ed3\u6784-150x150.png 150w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u7ed3\u6784-96x96.png 96w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u7ed3\u6784-24x24.png 24w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u7ed3\u6784-36x36.png 36w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u7ed3\u6784-48x48.png 48w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u7ed3\u6784-64x64.png 64w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u7ed3\u6784.png 665w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><img src=\"vscode-resource:\/\/file\/\/\/d:\/GitRepository\/JavaKnowledgeTree\/java\/images\/class%E6%96%87%E4%BB%B6%E7%BB%93%E6%9E%84.jpg\" alt=\"\" \/><\/p>\n<p>\u5728\u5b57\u6bb5\u8868\u4e2d\u4fdd\u5b58\u7740\u7c7b\u4e2d\u5404\u79cd\u5b57\u6bb5\u7684\u4fe1\u606f<\/p>\n<p><img src=\"vscode-resource:\/\/file\/\/\/d:\/GitRepository\/JavaKnowledgeTree\/java\/images\/class%E6%96%87%E4%BB%B6%E4%B8%AD%E7%9A%84%E5%AD%97%E6%AE%B5%E8%A1%A8%E4%B8%8E%E5%AD%97%E6%AE%B5%E8%AE%BF%E9%97%AE%E6%A0%87%E5%BF%97.png\" alt=\"\" \/><img loading=\"lazy\" class=\"alignnone size-medium wp-image-828\" src=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u4e2d\u7684\u8bbf\u95ee\u6807\u8bb0-300x159.png\" alt=\"\" width=\"300\" height=\"159\" srcset=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u4e2d\u7684\u8bbf\u95ee\u6807\u8bb0-300x159.png 300w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u4e2d\u7684\u8bbf\u95ee\u6807\u8bb0.png 650w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-medium wp-image-829\" src=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u4e2d\u7684\u5b57\u6bb5\u8868\u4e0e\u5b57\u6bb5\u8bbf\u95ee\u6807\u5fd7-300x221.png\" alt=\"\" width=\"300\" height=\"221\" srcset=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u4e2d\u7684\u5b57\u6bb5\u8868\u4e0e\u5b57\u6bb5\u8bbf\u95ee\u6807\u5fd7-300x221.png 300w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/class\u6587\u4ef6\u4e2d\u7684\u5b57\u6bb5\u8868\u4e0e\u5b57\u6bb5\u8bbf\u95ee\u6807\u5fd7.png 661w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u5f53\u5b57\u6bb5\u88abvolatile\u4fee\u9970\u65f6\uff0c\u5b57\u6bb5\u8868\u4e2d\u5bf9\u5e94\u5b57\u6bb5\u7684\u8bbf\u95ee\u6807\u5fd7\u5c06\u4f1a\u52a0\u4e0a<code>ACC_VOLATILE<\/code>\u3002<\/p>\n<h4 id=\"2-jvm%E7%9A%84%E5%86%85%E5%AD%98%E5%B1%8F%E9%9A%9C\" class=\"mume-header\">2. JVM\u7684\u5185\u5b58\u5c4f\u969c<\/h4>\n<h4 id=\"as-if-serial%E4%B8%8Ehappen-before\" class=\"mume-header\">as-if-serial\u4e0ehappen-before<\/h4>\n<p>\u867d\u7136\u4f1a\u4e71\u5e8f\u6267\u884c\uff0c\u4f46\u4f1a\u9075\u5faaas-if-serial\u8bed\u4e49\u548chappen-before\u539f\u5219\u3002<\/p>\n<ul>\n<li>as-if-serial : \u4e0d\u7ba1\u600e\u4e48\u91cd\u6392\u5e8f\uff08\u7f16\u8bd1\u5668\u548c\u5904\u7406\u5668\u4e3a\u4e86\u63d0\u9ad8\u5e76\u884c\u5ea6\uff09\uff0c\uff08\u5355\u7ebf\u7a0b\uff09\u7a0b\u5e8f\u7684\u6267\u884c\u7ed3\u679c\u4e0d\u4f1a\u6539\u53d8\u3002<\/li>\n<li>happen-before :\n<ul>\n<li>\u4e0e\u7a0b\u5e8f\u5458\u5bc6\u5207\u76f8\u5173\u7684happens-before\u89c4\u5219\u5982\u4e0b\uff1a<br \/>\n1\u3001\u7a0b\u5e8f\u987a\u5e8f\u89c4\u5219\uff1a\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u7684\u6bcf\u4e2a\u64cd\u4f5c\uff0chappens-before\u4e8e\u7ebf\u7a0b\u4e2d\u7684\u4efb\u610f\u540e\u7eed\u64cd\u4f5c\u3002<br \/>\n2\u3001\u76d1\u89c6\u5668\u9501\u89c4\u5219\uff1a\u4e00\u4e2a\u9501\u7684\u89e3\u9501\uff0chappens-before\u4e8e\u968f\u540e\u5bf9\u8fd9\u4e2a\u9501\u7684\u52a0\u9501\u3002<br \/>\n3\u3001volatile\u53d8\u91cf\u89c4\u5219\uff1a\u5bf9\u4e00\u4e2avolatile\u57df\u7684\u5199\uff0chappens-before\u4e8e\u4efb\u610f\u540e\u7eed\u5bf9\u8fd9\u4e2avolatile\u57df\u7684\u8bfb\u3002<br \/>\n4\u3001\u4f20\u9012\u6027\uff1a\u5982\u679cA happens-before B\uff0c\u4e14B happens-before C\uff0c\u90a3\u4e48A happens-before C\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u53ef\u4ee5\u53c2\u8003\u00a0<a href=\"https:\/\/blog.csdn.net\/u010571316\/article\/details\/64906481\">happens-before\u89c4\u5219\u548cas-if-serial\u8bed\u4e49<\/a>\u00a0\u3002\u4e0d\u7528\u8bb0\u5404\u79cd\u89c4\u5219\uff0c\u7406\u89e3\u5373\u53ef\u3002<\/p>\n<p>\u7f16\u8bd1\u5668\u7684\u91cd\u6392\u5e8f\u662f\u6307\uff0c\u5728\u4e0d\u6539\u53d8\u5355\u7ebf\u7a0b\u7a0b\u5e8f\u8bed\u4e49\u7684\u524d\u63d0\u4e0b\uff0c\u53ef\u4ee5\u91cd\u65b0\u5b89\u6392\u8bed\u53e5\u7684\u6267\u884c\u987a\u5e8f\u6765\u4f18\u5316\u7a0b\u5e8f\u7684\u6027\u80fd.<\/p>\n<p>\u7f16\u8bd1\u5668\u7684\u91cd\u6392\u5e8f\u548cCPU\u7684\u91cd\u6392\u5e8f\u7684\u539f\u5219\u4e00\u6837\uff0c\u4f1a\u9075\u5b88\u6570\u636e\u4f9d\u8d56\u6027\u539f\u5219\uff0c\u7f16\u8bd1\u5668\u548c\u5904\u7406\u5668\u4e0d\u4f1a\u6539\u53d8\u5b58\u5728\u6570\u636e\u4f9d\u8d56\u5173\u7cfb\u7684\u4e24\u4e2a\u64cd\u4f5c\u7684\u6267\u884c\u987a\u5e8f<\/p>\n<p>\u7f16\u8bd1\u5668\u3001\u5904\u7406\u5668\u90fd\u5fc5\u987b\u9075\u5b88\u8fd9\u4e2a\u8bed\u4e49\u3002JMM\u5c42\u9762\u7684\u5185\u5b58\u5c4f\u969c\u4e3a\u4e86\u4fdd\u8bc1\u5185\u5b58\u53ef\u89c1\u6027\uff0cJava\u7f16\u8bd1\u5668\u5728\u751f\u6210\u6307\u4ee4\u5e8f\u5217\u7684\u9002\u5f53\u4f4d\u7f6e\u4f1a\u63d2\u5165<strong>\u5185\u5b58\u5c4f\u969c<\/strong>\u6765\u7981\u6b62\u7279\u5b9a\u7c7b\u578b\u7684\u5904\u7406\u5668\u7684\u91cd\u6392\u5e8f\u3002<\/p>\n<p>JVM\u4e2d\u5185\u5b58\u5c4f\u969c\u6709\u4ee5\u4e0b4\u79cd\uff1a<\/p>\n<ol>\n<li>LoadLoad\u5c4f\u969c\uff1a\u5bf9\u4e8e\u8fd9\u6837\u7684\u8bed\u53e5Load1; LoadLoad; Load2\uff0c<br \/>\n\u5728Load2\u53ca\u540e\u7eed\u8bfb\u53d6\u64cd\u4f5c\u8981\u8bfb\u53d6\u7684\u6570\u636e\u88ab\u8bbf\u95ee\u524d\uff0c\u4fdd\u8bc1Load1\u8981\u8bfb\u53d6\u7684\u6570\u636e\u88ab\u8bfb\u53d6\u5b8c\u6bd5\u3002<\/li>\n<li>StoreStore\u5c4f\u969c\uff1a\u5bf9\u4e8e\u8fd9\u6837\u7684\u8bed\u53e5Store1; StoreStore; Store2\uff0c<br \/>\n\u5728Store2\u53ca\u540e\u7eed\u5199\u5165\u64cd\u4f5c\u6267\u884c\u524d\uff0c\u4fdd\u8bc1Store1\u7684\u5199\u5165\u64cd\u4f5c\u5bf9\u5176\u5b83\u5904\u7406\u5668\u53ef\u89c1\u3002<\/li>\n<li>LoadStore\u5c4f\u969c\uff1a\u5bf9\u4e8e\u8fd9\u6837\u7684\u8bed\u53e5Load1; LoadStore; Store2\uff0c<br \/>\n\u5728Store2\u53ca\u540e\u7eed\u5199\u5165\u64cd\u4f5c\u88ab\u5237\u51fa\u524d\uff0c\u4fdd\u8bc1Load1\u8981\u8bfb\u53d6\u7684\u6570\u636e\u88ab\u8bfb\u53d6\u5b8c\u6bd5\u3002<\/li>\n<li>StoreLoad\u5c4f\u969c\uff1a\u5bf9\u4e8e\u8fd9\u6837\u7684\u8bed\u53e5Store1; StoreLoad; Load2\uff0c<br \/>\n\u5728Load2\u53ca\u540e\u7eed\u6240\u6709\u8bfb\u53d6\u64cd\u4f5c\u6267\u884c\u524d\uff0c\u4fdd\u8bc1Store1\u7684\u5199\u5165\u5bf9\u6240\u6709\u5904\u7406\u5668\u53ef\u89c1\u3002<\/li>\n<\/ol>\n<p>\u53c2\u8003<a href=\"https:\/\/blog.csdn.net\/weixin_42008012\/article\/details\/105910949\">JVM\u7cfb\u5217(\u4e09)[\u8ba1\u7b97\u673a\u786c\u4ef6\u7684\u5185\u5b58\u6a21\u578b,\u6570\u636e\u4e00\u81f4\u6027\u95ee\u9898,CPU\u6307\u4ee4\u4e71\u5e8f\u6267\u884c,\u5408\u5e76\u5199]<\/a><\/p>\n<h4 id=\"3-hotspot%E6%BA%90%E7%A0%81%E5%AE%9E%E7%8E%B0\" class=\"mume-header\">3. Hotspot\u6e90\u7801\u5b9e\u73b0<\/h4>\n<p>JVM\u6267\u884c\u5b57\u8282\u7801\u7684\u8fc7\u7a0b\uff0c\u6700\u7ec8\u4f1a\u7ffb\u8bd1\u6210\u673a\u5668\u8bed\u8a00\uff0c\u5728CPU\u4e0a\u6267\u884c\u3002<\/p>\n<p>\u5bf9\u4e8eJVM\u5185\u5b58\u5c4f\u969c\u7684\u5b9e\u73b0\uff0c\u4e0d\u540cCPU\u6709\u4e0d\u540c\u7684\u5b9e\u73b0\u3002\u4ee5X86\u4e3a\u4f8b\uff0c\u4e0b\u9762\u662f\u4e2a\u6817\u5b50\uff1a<\/p>\n<p><img src=\"vscode-resource:\/\/file\/\/\/d:\/GitRepository\/JavaKnowledgeTree\/java\/images\/volatile%E5%AF%B9%E5%BA%94%E6%B1%87%E7%BC%96%E6%8C%87%E4%BB%A4.png\" alt=\"\" \/><img loading=\"lazy\" class=\"alignnone size-medium wp-image-830\" src=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/volatile\u5bf9\u5e94\u6c47\u7f16\u6307\u4ee4-300x90.png\" alt=\"\" width=\"300\" height=\"90\" srcset=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/volatile\u5bf9\u5e94\u6c47\u7f16\u6307\u4ee4-300x90.png 300w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/06\/volatile\u5bf9\u5e94\u6c47\u7f16\u6307\u4ee4.png 697w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u6709volatile\u53d8\u91cf\u4fee\u9970\u7684\u5171\u4eab\u53d8\u91cf\u8fdb\u884c\u5199\u64cd\u4f5c\u7684\u65f6\u5019\u4f1a\u591a\u7b2c\u4e8c\u884c\u6c47\u7f16\u4ee3\u7801\uff0c\u901a\u8fc7\u67e5IA-32\u67b6\u6784\u8f6f\u4ef6\u5f00\u53d1\u8005\u624b\u518c\u53ef\u77e5\uff0clock\u524d\u7f00\u7684\u6307\u4ee4\u5728\u591a\u6838\u5904\u7406\u5668\u4e0b\u4f1a\u5f15\u53d1\u4e86\u4e24\u4ef6\u4e8b\u60c5\uff1a<\/p>\n<ul>\n<li>\u5c06\u5f53\u524d\u5904\u7406\u5668\u7f13\u5b58\u884c\u7684\u6570\u636e\u4f1a\u5199\u56de\u5230\u7cfb\u7edf\u5185\u5b58\u3002<\/li>\n<li>\u8fd9\u4e2a\u5199\u56de\u5185\u5b58\u7684\u64cd\u4f5c\u4f1a\u5f15\u8d77\u5728\u5176\u4ed6CPU\u91cc\u7f13\u5b58\u4e86\u8be5\u5185\u5b58\u5730\u5740\u7684\u6570\u636e\u65e0\u6548\u3002<\/li>\n<\/ul>\n<p>\u4e5f\u5c31\u662f\u8bf4\u7528<code>lock<\/code>\u6307\u4ee4\u6765\u4fdd\u8bc1CPU\u4e2d\u7f13\u5b58\u7684\u53ef\u89c1\u6027\u3002<\/p>\n<blockquote><p>\u5728\u591a\u5904\u7406\u5668\u73af\u5883\u4e2d\uff0cLOCK# \u4fe1\u53f7\u786e\u4fdd\u5728\u58f0\u8a00\u8be5\u4fe1\u53f7\u671f\u95f4\uff0c\u5904\u7406\u5668\u53ef\u4ee5\u72ec\u5360\u4f7f\u7528\u4efb\u4f55\u5171\u4eab\u5185\u5b58\u3002\uff08\u56e0\u4e3a\u5b83\u4f1a\u9501\u4f4f\u603b\u7ebf\uff0c\u5bfc\u81f4\u5176\u4ed6CPU\u4e0d\u80fd\u8bbf\u95ee\u603b\u7ebf\uff0c\u4e0d\u80fd\u8bbf\u95ee\u603b\u7ebf\u5c31\u610f\u5473\u7740\u4e0d\u80fd\u8bbf\u95ee\u7cfb\u7edf\u5185\u5b58\uff09\uff0c\u4f46\u662f\u5728\u6700\u8fd1\u7684\u5904\u7406\u5668\u91cc\uff0cLOCK\uff03\u4fe1\u53f7\u4e00\u822c\u4e0d\u9501\u603b\u7ebf\uff0c\u800c\u662f\u9501\u7f13\u5b58\uff0c\u6bd5\u7adf\u9501\u603b\u7ebf\u5f00\u9500\u6bd4\u8f83\u5927\u3002<\/p>\n<p>\u5bf9\u4e8eIntel486\u548cPentium\u5904\u7406\u5668\uff0c\u5728\u9501\u64cd\u4f5c\u65f6\uff0c\u603b\u662f\u5728\u603b\u7ebf\u4e0a\u58f0\u8a00LOCK#\u4fe1\u53f7\u3002\u4f46\u5728P6\u548c\u6700\u8fd1\u7684\u5904\u7406\u5668\u4e2d\uff0c\u5982\u679c\u8bbf\u95ee\u7684\u5185\u5b58\u533a\u57df\u5df2\u7ecf\u7f13\u5b58\u5728\u5904\u7406\u5668\u5185\u90e8\uff0c\u5219\u4e0d\u4f1a\u58f0\u8a00LOCK#\u4fe1\u53f7\u3002\u76f8\u53cd\u5730\uff0c\u5b83\u4f1a\u9501\u5b9a\u8fd9\u5757\u5185\u5b58\u533a\u57df\u7684\u7f13\u5b58\u5e76\u56de\u5199\u5230\u5185\u5b58\uff0c\u5e76\u4f7f\u7528\u7f13\u5b58\u4e00\u81f4\u6027\u673a\u5236\u6765\u786e\u4fdd\u4fee\u6539\u7684\u539f\u5b50\u6027\uff0c\u6b64\u64cd\u4f5c\u88ab\u79f0\u4e3a\u201c\u7f13\u5b58\u9501\u5b9a\u201d\uff0c\u7f13\u5b58\u4e00\u81f4\u6027\u673a\u5236\u4f1a\u963b\u6b62\u540c\u65f6\u4fee\u6539\u88ab\u4e24\u4e2a\u4ee5\u4e0a\u5904\u7406\u5668\u7f13\u5b58\u7684\u5185\u5b58\u533a\u57df\u6570\u636e \u3002<\/p>\n<p>\u4e00\u4e2a\u5904\u7406\u5668\u7684\u7f13\u5b58\u56de\u5199\u5230\u5185\u5b58\u4f1a\u5bfc\u81f4\u5176\u4ed6\u5904\u7406\u5668\u7684\u7f13\u5b58\u65e0\u6548 \u3002IA-32\u5904\u7406\u5668\u548cIntel 64\u5904\u7406\u5668\u4f7f\u7528MESI\uff08\u4fee\u6539\uff0c\u72ec\u5360\uff0c\u5171\u4eab\uff0c\u65e0\u6548\uff09\u63a7\u5236\u534f\u8bae\u53bb\u7ef4\u62a4\u5185\u90e8\u7f13\u5b58\u548c\u5176\u4ed6\u5904\u7406\u5668\u7f13\u5b58\u7684\u4e00\u81f4\u6027\u3002\u5728\u591a\u6838\u5904\u7406\u5668\u7cfb\u7edf\u4e2d\u8fdb\u884c\u64cd\u4f5c\u7684\u65f6\u5019\uff0cIA-32 \u548cIntel 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href=\"https:\/\/www.cnblogs.com\/awkflf11\/p\/9218414.html\">\u5e76\u53d1\u4e4bvolatile\u5e95\u5c42\u539f\u7406<\/a><\/p>\n<h5 id=\"32-%E6%89%A9%E5%B1%952%E7%BC%93%E5%AD%98%E4%B8%80%E8%87%B4%E6%80%A7%E5%8D%8F%E8%AE%AE\" class=\"mume-header\">3.2 \u6269\u5c552\uff1a\u7f13\u5b58\u4e00\u81f4\u6027\u534f\u8bae<\/h5>\n<p>\u53c2\u8003\u8fd9\u7bc7\u6587\u7ae0\u00a0<a href=\"https:\/\/www.cnblogs.com\/z00377750\/p\/9180644.html\">\u3010\u5e76\u53d1\u7f16\u7a0b\u3011MESI&#8211;CPU\u7f13\u5b58\u4e00\u81f4\u6027\u534f\u8bae<\/a><\/p>\n<h1 id=\"%E5%8F%82%E8%80%83%E8%B5%84%E6%96%99\" class=\"mume-header\">\u53c2\u8003\u8d44\u6599<\/h1>\n<ul>\n<li><a href=\"https:\/\/blog.csdn.net\/mnb65482\/article\/details\/80458571\">\u6df1\u5165\u7406\u89e3\u5355\u4f8b\u6a21\u5f0f\uff1a\u9759\u6001\u5185\u90e8\u7c7b\u5355\u4f8b\u539f\u7406<\/a><\/li>\n<li><a href=\"https:\/\/www.jianshu.com\/p\/9e467de97216\">java\u5e76\u53d1(4)\u6df1\u5165\u7406\u89e3volatile<\/a><\/li>\n<li><a 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href=\"https:\/\/www.cnblogs.com\/z00377750\/p\/9180644.html\">\u3010\u5e76\u53d1\u7f16\u7a0b\u3011MESI&#8211;CPU\u7f13\u5b58\u4e00\u81f4\u6027\u534f\u8bae<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u4ece\u4e00\u9053\u9762\u8bd5\u9898\u8bb2\u8d77\uff1a\u91c7\u7528DCL\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u65f6\uff0c\u662f\u5426\u9700\u8981\u52a0volatile\u5173\u952e\u5b57\uff1f\u4e3a\u4ec0\u4e48\uff1f \u6709\u5173\u5355\u4f8b\u6a21\u5f0f \u6211\u4eec\u5728\u7f51 <a href='http:\/\/prayerlaputa.com\/?p=823' 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