{"id":2999,"date":"2024-03-13T09:39:09","date_gmt":"2024-03-13T01:39:09","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=2999"},"modified":"2024-12-20T19:09:04","modified_gmt":"2024-12-20T11:09:04","slug":"java%e5%b9%b6%e5%8f%91%e7%bc%96%e7%a8%8b-cas%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=2999","title":{"rendered":"Java\u5e76\u53d1\u7f16\u7a0b \u2013 CAS\u673a\u5236"},"content":{"rendered":"\n<p>\u5728Java\u5e76\u53d1\u7f16\u7a0b\u9886\u57df\uff0c\u65e0\u9501\u7f16\u7a0b\u6a21\u578b\u56e0\u5176\u51fa\u8272\u7684\u6027\u80fd\u548c\u8f83\u4f4e\u7684\u8d44\u6e90\u6d88\u8017\u6210\u4e3a\u4e86\u4e00\u4e2a\u70ed\u95e8\u8bdd\u9898\u3002\u6838\u5fc3\u4e8e\u6b64\u6a21\u578b\u7684\u662fCAS\uff08Compare-And-Swap\uff09\u673a\u5236\uff0c\u5b83\u662f\u5b9e\u73b0\u5982<code>AtomicInteger<\/code>\u7b49\u539f\u5b50\u7c7b\u7684\u57fa\u77f3\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8CAS\u673a\u5236\u7684\u7279\u6027\u3001\u5b9e\u73b0\u539f\u7406\u3001\u4f18\u52a3\u52bf\u4ee5\u53ca\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u6848\u4f8b\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e00\u3001CAS\u673a\u5236\u7684\u7279\u6027<\/h5>\n\n\n\n<p>CAS\u662f\u4e00\u79cd\u57fa\u4e8e\u51b2\u7a81\u68c0\u6d4b\u7684\u8f7b\u91cf\u7ea7\u540c\u6b65\u673a\u5236\uff0c\u5b83\u5305\u542b\u4e09\u4e2a\u64cd\u4f5c\u6570\uff1a\u5185\u5b58\u4f4d\u7f6e\uff08V\uff09\uff0c\u9884\u671f\u539f\u503c\uff08A\uff09\u548c\u65b0\u503c\uff08B\uff09\u3002\u53ea\u6709\u5f53\u4f4d\u7f6eV\u7684\u503c\u7b49\u4e8eA\u65f6\uff0cCAS\u624d\u4f1a\u81ea\u52a8\u5c06\u4f4d\u7f6eV\u5904\u7684\u503c\u66f4\u65b0\u4e3aB\uff0c\u8fd9\u4e2a\u6bd4\u8f83\u548c\u4ea4\u6362\u7684\u8fc7\u7a0b\u662f\u4e00\u4e2a\u539f\u5b50\u64cd\u4f5c\u3002\u8fd9\u79cd\u673a\u5236\u652f\u6301\u65e0\u9501\u7684\u5e76\u53d1\u63a7\u5236\uff0c\u907f\u514d\u4e86\u4f20\u7edf\u9501\u673a\u5236\u5728\u591a\u7ebf\u7a0b\u9ad8\u5e76\u53d1\u73af\u5883\u4e0b\u7684\u6027\u80fd\u74f6\u9888\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e8c\u3001CAS\u7684\u5b9e\u73b0\u539f\u7406<\/h5>\n\n\n\n<p>CAS\u7684\u5b9e\u73b0\u4f9d\u8d56\u4e8e\u5904\u7406\u5668\u63d0\u4f9b\u7684\u539f\u5b50\u6307\u4ee4\u3002\u8fd9\u4e9b\u6307\u4ee4\u80fd\u591f\u4fdd\u8bc1\u8bfb\u53d6\u3001\u4fee\u6539\u548c\u5199\u5165\u64cd\u4f5c\u5728\u5355\u4e2a\u64cd\u4f5c\u4e2d\u5b8c\u6210\uff0c\u4e0d\u4f1a\u88ab\u5176\u4ed6\u7ebf\u7a0b\u7684\u64cd\u4f5c\u6253\u65ad\u3002Java\u8bed\u8a00\u901a\u8fc7JNI\uff08Java Native Interface\uff09\u6765\u8c03\u7528\u5e95\u5c42\u6307\u4ee4\u5b9e\u73b0CAS\u64cd\u4f5c\uff0c\u4ece\u800c\u5728<code>java.util.concurrent.atomic<\/code>\u5305\u4e2d\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684\u539f\u5b50\u7c7b\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e09\u3001CAS\u7684\u4f18\u52a3\u52bf<\/h5>\n\n\n\n<h6 class=\"wp-block-heading\">\u4f18\u52bf<\/h6>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u9ad8\u6027\u80fd<\/strong>\uff1aCAS\u64cd\u4f5c\u907f\u514d\u4e86\u9501\u7684\u4f7f\u7528\uff0c\u51cf\u5c11\u4e86\u7ebf\u7a0b\u5207\u6362\u548c\u8c03\u5ea6\u7684\u5f00\u9500\uff0c\u63d0\u9ad8\u4e86\u5e76\u53d1\u6027\u80fd\u3002<\/li>\n\n\n\n<li><strong>\u65e0\u9501\u7f16\u7a0b<\/strong>\uff1a\u63d0\u4f9b\u4e86\u4e00\u79cd\u65e0\u9501\u7684\u5e76\u53d1\u63a7\u5236\u673a\u5236\uff0c\u964d\u4f4e\u4e86\u6b7b\u9501\u7684\u98ce\u9669\u3002<\/li>\n<\/ul>\n\n\n\n<h6 class=\"wp-block-heading\">\u52a3\u52bf<\/h6>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ABA\u95ee\u9898<\/strong>\uff1a\u5982\u679c\u53d8\u91cfV\u5148\u4eceA\u53d8\u6210B\uff0c\u7136\u540e\u53c8\u4eceB\u53d8\u56deA\uff0cCAS\u5c06\u65e0\u6cd5\u8bc6\u522b\u51faV\u5df2\u7ecf\u88ab\u4fee\u6539\u8fc7\u4e24\u6b21\u3002<\/li>\n\n\n\n<li><strong>\u5faa\u73af\u65f6\u95f4\u957f\u5f00\u9500\u5927<\/strong>\uff1a\u5728\u9ad8\u5e76\u53d1\u60c5\u51b5\u4e0b\uff0cCAS\u5931\u8d25\u540e\u9700\u8981\u4e0d\u65ad\u91cd\u8bd5\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u8f83\u957f\u7684\u5faa\u73af\u65f6\u95f4\uff0c\u4ece\u800c\u589e\u52a0CPU\u5f00\u9500\u3002<\/li>\n\n\n\n<li><strong>\u53ea\u80fd\u4fdd\u8bc1\u4e00\u4e2a\u5171\u4eab\u53d8\u91cf\u7684\u539f\u5b50\u64cd\u4f5c<\/strong>\uff1a\u5f53\u9700\u8981\u540c\u65f6\u66f4\u65b0\u591a\u4e2a\u5171\u4eab\u53d8\u91cf\u65f6\uff0cCAS\u65e0\u80fd\u4e3a\u529b\uff0c\u9700\u8981\u4f7f\u7528\u9501\u6216\u5176\u4ed6\u673a\u5236\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">\u56db\u3001\u5b9e\u9645\u5e94\u7528\u6848\u4f8b<\/h5>\n\n\n\n<p>\u8003\u8651\u4e00\u4e2a\u9ad8\u5e76\u53d1\u7684\u7f51\u7ad9\u8bbf\u95ee\u8ba1\u6570\u5668\uff0c\u4f7f\u7528<code>AtomicInteger<\/code>\u5b9e\u73b0\u53ef\u4ee5\u4fdd\u8bc1\u8ba1\u6570\u5668\u7684\u7ebf\u7a0b\u5b89\u5168\u6027\uff1a<\/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-70cd67241ae0ab24d9ef8ac7ff693b7d\"><code>import java.util.concurrent.atomic.AtomicInteger;\n\npublic class WebCounter {\n    private final AtomicInteger count = new AtomicInteger();\n\n    \/\/ \u589e\u52a0\u8bbf\u95ee\u8ba1\u6570\n    public void increment() {\n        count.incrementAndGet();\n    }\n\n    \/\/ \u83b7\u53d6\u5f53\u524d\u8bbf\u95ee\u8ba1\u6570\n    public int getCount() {\n        return count.get();\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u65e0\u8bba\u591a\u5c11\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee<code>increment()<\/code>\u65b9\u6cd5\uff0c<code>AtomicInteger<\/code>\u5185\u90e8\u7684CAS\u64cd\u4f5c\u90fd\u80fd\u786e\u4fdd\u6bcf\u6b21\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u6210\u529f\u66f4\u65b0<code>count<\/code>\u53d8\u91cf\uff0c\u4ece\u800c\u907f\u514d\u4e86\u5e76\u53d1\u4e0b\u7684\u6570\u636e\u4e0d\u4e00\u81f4\u95ee\u9898\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e94\u3001\u603b\u7ed3<\/h5>\n\n\n\n<p>CAS\u673a\u5236\u662fJava\u5e76\u53d1\u7f16\u7a0b\u4e2d\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5b83\u901a\u8fc7\u539f\u5b50\u64cd\u4f5c\u63d0\u4f9b\u4e86\u4e00\u79cd\u9ad8\u6548\u7684\u65e0\u9501\u5e76\u53d1\u63a7\u5236\u65b9\u5f0f\u3002\u867d\u7136CAS\u6709\u5176\u5c40\u9650\u6027\uff0c\u5982ABA\u95ee\u9898\u548c\u53ea\u80fd\u64cd\u4f5c\u5355\u4e2a\u53d8\u91cf\u7684\u95ee\u9898\uff0c\u4f46\u5b83\u5728\u6027\u80fd\u4f18\u5316\u65b9\u9762\u7684\u4f18\u52bf\u4f7f\u5176\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u6709\u7740\u5e7f\u6cdb\u7684\u5e94\u7528\u3002\u7406\u89e3CAS\u7684\u5de5\u4f5c\u539f\u7406\u548c\u6b63\u786e\u5e94\u7528CAS\u673a\u5236\uff0c\u5bf9\u4e8e\u5f00\u53d1\u9ad8\u6027\u80fd\u5e76\u53d1\u7a0b\u5e8f\u5177\u6709\u91cd\u8981\u610f\u4e49\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Java\u5e76\u53d1\u7f16\u7a0b\u9886\u57df\uff0c\u65e0\u9501\u7f16\u7a0b\u6a21\u578b\u56e0\u5176\u51fa\u8272\u7684\u6027\u80fd\u548c\u8f83\u4f4e\u7684\u8d44\u6e90\u6d88\u8017\u6210\u4e3a\u4e86\u4e00\u4e2a\u70ed\u95e8\u8bdd\u9898\u3002\u6838\u5fc3\u4e8e\u6b64\u6a21\u578b\u7684\u662fCAS\uff08 [&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":[130,16],"class_list":["post-2999","post","type-post","status-publish","format-standard","hentry","category-59","tag-130","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u5e76\u53d1\u7f16\u7a0b \u2013 CAS\u673a\u5236<\/title>\n<meta name=\"description\" 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