{"id":15777,"date":"2023-02-08T16:39:50","date_gmt":"2023-02-08T08:39:50","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=15777"},"modified":"2023-02-08T16:39:54","modified_gmt":"2023-02-08T08:39:54","slug":"synchronized%e5%92%8caqs%e7%9a%84%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/15777.html","title":{"rendered":"synchronized\u548cAQS\u7684\u533a\u522b"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote\">\n<p>synchronized\u548cAQS\u7684\u533a\u522b\u662f\uff1a1.ReentrantLock \u663e\u793a\u7684\u83b7\u5f97\u3001\u91ca\u653e\u9501\uff0c synchronized \u9690\u5f0f\u83b7\u5f97\u91ca\u653e\u9501\uff1b2. ReentrantLock \u53ef\u54cd\u5e94\u4e2d\u65ad\u3001\u53ef\u8f6e\u56de\uff0c synchronized \u662f\u4e0d\u53ef\u4ee5\u54cd\u5e94\u4e2d\u65ad\u7684\uff0c\u4e3a\u5904\u7406\u9501\u7684\u4e0d\u53ef\u7528\u6027\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7684\u7075\u6d3b\u6027\u7b49\u3002<\/p>\n<\/blockquote>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"680\" height=\"421\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/02\/\u6dfb\u52a0\u6807\u9898-5-4.png?x-oss-process=image\/auto-orient,1\/format,webp\" alt=\"\" class=\"wp-image-15778\" srcset=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/02\/\u6dfb\u52a0\u6807\u9898-5-4.png 680w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/02\/\u6dfb\u52a0\u6807\u9898-5-4-300x186.png 300w\" sizes=\"(max-width: 680px) 100vw, 680px\" \/><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\"><strong>\u4e00\u3001synchronized\u548cAQS\u7684\u533a\u522b<\/strong><\/h2>\n\n\n\n<p>1.ReentrantLock \u663e\u793a\u7684\u83b7\u5f97\u3001\u91ca\u653e\u9501\uff0c synchronized \u9690\u5f0f\u83b7\u5f97\u91ca\u653e\u9501<\/p>\n\n\n\n<p>2.ReentrantLock \u53ef\u54cd\u5e94\u4e2d\u65ad\u3001\u53ef\u8f6e\u56de\uff0c synchronized \u662f\u4e0d\u53ef\u4ee5\u54cd\u5e94\u4e2d\u65ad\u7684\uff0c\u4e3a\u5904\u7406\u9501\u7684\u4e0d\u53ef\u7528\u6027\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7684\u7075\u6d3b\u6027<\/p>\n\n\n\n<p>3.ReentrantLock \u662f API \u7ea7\u522b\u7684\uff0c synchronized \u662f JVM \u7ea7\u522b\u7684<\/p>\n\n\n\n<p>4.ReentrantLock \u53ef\u4ee5\u5b9e\u73b0\u516c\u5e73\u9501<\/p>\n\n\n\n<p>5.ReentrantLock \u901a\u8fc7 Condition \u53ef\u4ee5\u7ed1\u5b9a\u591a\u4e2a\u6761\u4ef6<\/p>\n\n\n\n<p>6.\u5e95\u5c42\u5b9e\u73b0\u4e0d\u4e00\u6837\uff0c synchronized \u662f\u540c\u6b65\u963b\u585e\uff0c\u4f7f\u7528\u7684\u662f\u60b2\u89c2\u5e76\u53d1\u7b56\u7565\uff0c lock \u662f\u540c\u6b65\u975e\u963b\u585e\uff0c\u91c7\u7528\u7684\u662f\u4e50\u89c2\u5e76\u53d1\u7b56\u7565<\/p>\n\n\n\n<p>7.Lock \u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u800c synchronized \u662f Java \u4e2d\u7684\u5173\u952e\u5b57\uff0c synchronized \u662f\u5185\u7f6e\u7684\u8bed\u8a00\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p>8.synchronized \u5728\u53d1\u751f\u5f02\u5e38\u65f6\uff0c\u4f1a\u81ea\u52a8\u91ca\u653e\u7ebf\u7a0b\u5360\u6709\u7684\u9501\uff0c\u56e0\u6b64\u4e0d\u4f1a\u5bfc\u81f4\u6b7b\u9501\u73b0\u8c61\u53d1\u751f\uff1b\u800c Lock \u5728\u53d1\u751f\u5f02\u5e38\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u4e3b\u52a8\u901a\u8fc7 unLock()\u53bb\u91ca\u653e\u9501\uff0c\u5219\u5f88\u53ef\u80fd\u9020\u6210\u6b7b\u9501\u73b0\u8c61\uff0c\u56e0\u6b64\u4f7f\u7528 Lock \u65f6\u9700\u8981\u5728 finally \u5757\u4e2d\u91ca\u653e\u9501\u3002<\/p>\n\n\n\n<p>9.Lock \u53ef\u4ee5\u8ba9\u7b49\u5f85\u9501\u7684\u7ebf\u7a0b\u54cd\u5e94\u4e2d\u65ad\uff0c\u800c synchronized \u5374\u4e0d\u884c\uff0c\u4f7f\u7528 synchronized \u65f6\uff0c\u7b49\u5f85\u7684\u7ebf\u7a0b\u4f1a\u4e00\u76f4\u7b49\u5f85\u4e0b\u53bb\uff0c\u4e0d\u80fd\u591f\u54cd\u5e94\u4e2d\u65ad\u3002<\/p>\n\n\n\n<p>\u901a\u8fc7 Lock \u53ef\u4ee5\u77e5\u9053\u6709\u6ca1\u6709\u6210\u529f\u83b7\u53d6\u9501\uff0c\u800c synchronized \u5374\u65e0\u6cd5\u529e\u5230\u3002<\/p>\n\n\n\n<p>10.Lock \u53ef\u4ee5\u63d0\u9ad8\u591a\u4e2a\u7ebf\u7a0b\u8fdb\u884c\u8bfb\u64cd\u4f5c\u7684\u6548\u7387\uff0c\u65e2\u5c31\u662f\u5b9e\u73b0\u8bfb\u5199\u9501\u7b49<\/p>\n\n\n\n<p><strong>\u5ef6\u4f38\u9605\u8bfb\uff1a<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u4e8c\u3001Synchronized\u7684\u6d41\u7a0b<\/strong><\/h2>\n\n\n\n<ul>\n<li>0.\u5148\u83b7\u53d6\u504f\u5411\u9501\uff0c\u4e0d\u884c\u518d\u81ea\u65cb\u9501\uff0c\u83b7\u53d6\u5230\u9501\u5c31\u662f\u8f7b\u91cf\u7ea7\u9501\uff0c\u5982\u679c\u81ea\u65cb\u83b7\u53d6\u4e0d\u5230\u9501\u5c31\u662f\u91cd\u91cf\u7ea7\u9501\u3002\u91cd\u91cf\u7ea7\u9501\u7684\u6d41\u7a0b\u5c31\u662f\u5982\u4e0b\uff1a<\/li>\n\n\n\n<li>1.\u7ade\u4e89\u7684\u7ebf\u7a0b\u8fdb\u5165contentionList\uff0c\u5e76\u8fc1\u79fb\u90e8\u5206\u7684\u7ade\u9009\u8005\u5230EntryList\uff0c\u6b64\u4e3e\u662f\u4e3a\u4e86\u964d\u4f4e\u7ade\u4e89\uff08\u9632\u6b62\u6240\u6709\u7ebf\u7a0b\u540c\u65f6\u9192\u6765\u53bbCAS\u83b7\u53d6\u9501\uff09<\/li>\n\n\n\n<li>2.\u83b7\u53d6\u9501\u7684\u7ebf\u7a0b\u4f1a\u5728unlock\u7684\u65f6\u5019\u5524\u9192entryList\u4e2d\u7684\u7ebf\u7a0b\uff0c\u8be5\u7ebf\u7a0b\u5c31\u662fonDeck\uff0c\u6ce8\u610f\u5e76\u4e0d\u662f\u628a\u9501\u7ed9onDeck\uff0c\u800c\u662f\u5141\u8bb8\u4ed6<br>\u548c\u5176\u4ed6\u521a\u51c6\u5907\u6765\u83b7\u53d6\u9501\u7684\u7ebf\u7a0b\u8fdb\u884c\u7ade\u4e89\uff08\u5176\u4ed6\u5df2\u7ecf\u8fdb\u5165contentionList\u7684\u7ebf\u7a0b\u4e0d\u4f1a\u53bb\uff09\uff0c\u8fd9\u5c31\u662f\u975e\u516c\u5e73\u6027\u3002<\/li>\n\n\n\n<li>3.onDeck\u83b7\u53d6\u6210\u529f\u5219\u4f1a\u53d8\u4e3aOwner\u7ebf\u7a0b\uff0c\u5982\u679cowner\u7ebf\u7a0b\u88abwait\u65b9\u6cd5\u963b\u585e\uff0c\u5219\u8f6c\u79fb\u5230WaitSet\u961f\u5217\uff0c\u8be5\u961f\u5217<br>\u4f1a\u88abnotify\u548cnotifyAll\u5524\u9192\u5e76\u91cd\u65b0\u52a0\u5165\u5230entryList<\/li>\n\n\n\n<li>4.\u7ebf\u7a0b\u518d\u8fdb\u5165ContentionList\u65f6\u5019 \u4f1a\u5148\u81ea\u65cb\u83b7\u53d6\u9501\uff0c\u83b7\u53d6\u4e0d\u5230\u5c31\u8fdb\u5165contentionList\uff0c\u8fd9\u4e5f\u662f\u4e00\u4e2a\u4e0d\u516c\u5e73\u7684\u5730\u65b9<\/li>\n\n\n\n<li>5.\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2amonitor\u5bf9\u8c61\uff0c\u52a0\u9501\u5c31\u8bf4\u7ade\u4e89monitor\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li>6.\u4f18\u5316\u540e\u7684\u504f\u5411\u9501\u548c\u8f7b\u91cf\u7ea7\u9501\u90fd\u662f\u5bf9\u5bf9\u8c61\u5934\u64cd\u4f5c\uff0c\u4e0d\u9700\u8981\u7ecf\u8fc7\u64cd\u4f5c\u7cfb\u7edf\u52a0\u9501\u3002<\/li>\n<\/ul>\n\n\n\n<p><br>\u4ee5\u4e0a\u5c31\u662f\u5173\u4e8esynchronized\u548cAQS\u7684\u533a\u522b\u7684\u5185\u5bb9\u5e0c\u671b\u5bf9\u5927\u5bb6\u6709\u5e2e\u52a9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"synchronized\u548cAQS\u7684\u533a\u522b\u662f\uff1a1.ReentrantLock \u663e\u793a\u7684\u83b7\u5f97\u3001\u91ca\u653e\u9501\uff0c synchro [&hellip;]","protected":false},"author":1,"featured_media":15778,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/15777"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=15777"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/15777\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/15778"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=15777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=15777"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=15777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}