{"id":65917,"date":"2023-12-14T09:34:28","date_gmt":"2023-12-14T01:34:28","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=65917"},"modified":"2023-12-14T09:34:41","modified_gmt":"2023-12-14T01:34:41","slug":"synchronized%e5%92%8clock%e7%9a%84%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/65917.html","title":{"rendered":"synchronized\u548clock\u7684\u533a\u522b"},"content":{"rendered":"\n
\n

Java\u4e2d\u7684\u591a\u7ebf\u7a0b\u7f16\u7a0b\u662f\u5e38\u89c1\u7684\u9700\u6c42\uff0c\u800c\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002\u5728Java\u4e2d\uff0csynchronized\u548clock\u662f\u4e24\u79cd\u5e38\u7528\u7684\u673a\u5236\uff0c\u7528\u4e8e\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65\u548c\u4e92\u65a5\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8synchronized\u548clock\u4e4b\u95f4\u7684\u533a\u522b\uff0c\u5305\u62ec\u7528\u6cd5\u3001\u6027\u80fd\u3001\u7075\u6d3b\u6027\u548c\u9002\u7528\u573a\u666f\u7b49\u65b9\u9762\uff0c\u4ee5\u5e2e\u52a9\u5f00\u53d1\u4eba\u5458\u66f4\u597d\u5730\u9009\u62e9\u9002\u5f53\u7684\u7ebf\u7a0b\u540c\u6b65\u673a\u5236\u3002<\/p>\n<\/blockquote>\n\n\n\n

1.<\/strong>\u7528\u6cd5<\/strong><\/h2>\n\n\n\n

synchronized\uff1asynchronized\u662fJava\u4e2d\u7684\u5173\u952e\u5b57\uff0c\u53ef\u4ee5\u5e94\u7528\u4e8e\u65b9\u6cd5\u7ea7\u522b\u6216\u4ee3\u7801\u5757\u7ea7\u522b\u3002\u5728\u65b9\u6cd5\u7ea7\u522b\u4f7f\u7528\u65f6\uff0c\u5b83\u53ef\u4ee5\u4fee\u9970\u6574\u4e2a\u65b9\u6cd5\uff0c\u5c06\u65b9\u6cd5\u53d8\u4e3a\u540c\u6b65\u65b9\u6cd5\u3002\u5728\u4ee3\u7801\u5757\u7ea7\u522b\u4f7f\u7528\u65f6\uff0c\u901a\u8fc7\u6307\u5b9a\u4e00\u4e2a\u5bf9\u8c61\u4f5c\u4e3a\u9501\u6765\u521b\u5efa\u540c\u6b65\u4ee3\u7801\u5757\u3002<\/p>\n\n\n\n

lock\uff1alock\u662fJava\u4e2d\u7684\u63a5\u53e3\uff0c\u9700\u8981\u4f7f\u7528\u5176\u5177\u4f53\u5b9e\u73b0\u7c7b\uff0c\u5982ReentrantLock\uff0c\u6765\u521b\u5efa\u9501\u5bf9\u8c61\u3002lock\u63d0\u4f9b\u4e86\u66f4\u7075\u6d3b\u7684\u9501\u5b9a\u548c\u89e3\u9501\u65b9\u5f0f\uff0c\u5141\u8bb8\u7a0b\u5e8f\u5458\u66f4\u7cbe\u786e\u5730\u63a7\u5236\u540c\u6b65\u3002<\/p>\n\n\n\n

2.<\/strong>\u6027\u80fd<\/strong><\/h2>\n\n\n\n

synchronized\uff1asynchronized\u662fJava\u7684\u5185\u7f6e\u540c\u6b65\u673a\u5236\uff0c\u7531JVM\u76f4\u63a5\u652f\u6301\u3002\u867d\u7136\u5b83\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u4f46\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0cJVM\u4f1a\u8fdb\u884c\u4f18\u5316\u4ee5\u63d0\u9ad8\u540c\u6b65\u6027\u80fd\u3002<\/p>\n\n\n\n

lock\uff1alock\u673a\u5236\u76f8\u5bf9\u4e8esynchronized\u6765\u8bf4\uff0c\u66f4\u5177\u6709\u6027\u80fd\u4f18\u52bf\uff0c\u7279\u522b\u662f\u5728\u9ad8\u5e76\u53d1\u60c5\u51b5\u4e0b\u3002\u5b83\u5141\u8bb8\u66f4\u7ec6\u7c92\u5ea6\u7684\u63a7\u5236\uff0c\u51cf\u5c11\u4e86\u7ade\u4e89\uff0c\u63d0\u9ad8\u4e86\u541e\u5410\u91cf\u3002<\/p>\n\n\n\n

3.<\/strong>\u7075\u6d3b\u6027<\/strong><\/h2>\n\n\n\n

synchronized\uff1asynchronized\u662f\u4e00\u79cd\u76f8\u5bf9\u7b80\u5355\u7684\u540c\u6b65\u673a\u5236\uff0c\u9002\u5408\u7528\u4e8e\u4e00\u4e9b\u57fa\u672c\u7684\u540c\u6b65\u9700\u6c42\u3002\u5b83\u4e0d\u652f\u6301\u5c1d\u8bd5\u9501\u5b9a\u3001\u5b9a\u65f6\u9501\u5b9a\u7b49\u9ad8\u7ea7\u529f\u80fd\u3002<\/p>\n\n\n\n

lock\uff1alock\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u7075\u6d3b\u6027\u548c\u529f\u80fd\uff0c\u4f8b\u5982\u5c1d\u8bd5\u9501\u5b9a\u3001\u5b9a\u65f6\u9501\u5b9a\u3001\u53ef\u4e2d\u65ad\u9501\u5b9a\u7b49\u3002\u8fd9\u4f7f\u5f97\u5b83\u66f4\u9002\u5408\u590d\u6742\u7684\u591a\u7ebf\u7a0b\u573a\u666f\u3002<\/p>\n\n\n\n

4.<\/strong>\u9002\u7528\u573a\u666f<\/strong><\/h2>\n\n\n\n

synchronized\uff1asynchronized\u9002\u7528\u4e8e\u7b80\u5355\u7684\u540c\u6b65\u9700\u6c42\uff0c\u7279\u522b\u662f\u5728\u4e0d\u9700\u8981\u9ad8\u7ea7\u529f\u80fd\u7684\u60c5\u51b5\u4e0b\u3002\u5b83\u662fJava\u6700\u5e38\u7528\u7684\u540c\u6b65\u673a\u5236\u4e4b\u4e00\u3002<\/p>\n\n\n\n

lock\uff1alock\u9002\u7528\u4e8e\u9700\u8981\u66f4\u9ad8\u7ea7\u540c\u6b65\u63a7\u5236\u3001\u66f4\u9ad8\u6027\u80fd\u548c\u66f4\u7075\u6d3b\u6027\u7684\u573a\u666f\uff0c\u4f8b\u5982\u9ad8\u5e76\u53d1\u7684\u5e76\u884c\u8ba1\u7b97\u6216\u9700\u8981\u5b9a\u65f6\u91ca\u653e\u9501\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n

\"synchronized\u548clock\u7684\u533a\u522b\"<\/p>\n\n\n\n

\u5e38\u89c1\u95ee\u7b54<\/strong><\/h2>\n\n\n\n

1.synchronized<\/strong>\u548cLock\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n\n\n\n

synchronized\u548cLock\u90fd\u662fJava\u4e2d\u7528\u4e8e\u7ba1\u7406\u591a\u7ebf\u7a0b\u540c\u6b65\u7684\u673a\u5236\u3002\u5b83\u4eec\u7528\u4e8e\u786e\u4fdd\u591a\u4e2a\u7ebf\u7a0b\u80fd\u591f\u4ee5\u534f\u8c03\u7684\u65b9\u5f0f\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u3002<\/p>\n\n\n\n

2.<\/strong>\u4e3b\u8981\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n\n\n\n

\u4e3b\u8981\u533a\u522b\u5728\u4e8e\u7075\u6d3b\u6027\u548c\u529f\u80fd\u3002synchronized\u662fJava\u8bed\u8a00\u5185\u7f6e\u7684\u5173\u952e\u5b57\uff0c\u63d0\u4f9b\u4e86\u57fa\u672c\u7684\u540c\u6b65\u529f\u80fd\uff0c\u800cLock\u662f\u4e00\u4e2aJava\u63a5\u53e3\u7684\u5b9e\u73b0\uff0c\u63d0\u4f9b\u4e86\u66f4\u591a\u9ad8\u7ea7\u548c\u7075\u6d3b\u7684\u540c\u6b65\u529f\u80fd\u3002<\/p>\n\n\n\n

3.synchronized<\/strong>\u548cLock\u5982\u4f55\u5b9e\u73b0\u540c\u6b65\uff1f<\/strong><\/p>\n\n\n\n

synchronized\u901a\u8fc7\u5728\u65b9\u6cd5\u6216\u4ee3\u7801\u5757\u4e0a\u6dfb\u52a0synchronized\u5173\u952e\u5b57\u6765\u5b9e\u73b0\u540c\u6b65\u3002<\/p>\n\n\n\n

Lock\u4f7f\u7528ReentrantLock\u7b49\u5b9e\u73b0\u7c7b\u6765\u521b\u5efa\u9501\u5bf9\u8c61\uff0c\u7136\u540e\u901a\u8fc7lock()\u548cunlock()\u65b9\u6cd5\u624b\u52a8\u63a7\u5236\u9501\u7684\u83b7\u53d6\u548c\u91ca\u653e\u3002<\/p>\n\n\n\n

4.\u4f55\u65f6\u4f7f\u7528synchronized\u548c\u4f55\u65f6\u4f7f\u7528Lock\uff1f<\/p>\n\n\n\n

synchronized\u9002\u7528\u4e8e\u7b80\u5355\u7684\u540c\u6b65\u9700\u6c42\uff0c\u5b83\u66f4\u6613\u4e8e\u4f7f\u7528\u548c\u7406\u89e3\uff0c\u901a\u5e38\u7528\u4e8e\u8f83\u5c0f\u8303\u56f4\u7684\u540c\u6b65\u3002<\/p>\n\n\n\n

Lock\u9002\u7528\u4e8e\u590d\u6742\u7684\u540c\u6b65\u9700\u6c42\uff0c\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u63a7\u5236\u9009\u9879\uff0c\u5982\u53ef\u4e2d\u65ad\u9501\u3001\u516c\u5e73\u9501\u7b49\uff0c\u901a\u5e38\u7528\u4e8e\u66f4\u590d\u6742\u7684\u591a\u7ebf\u7a0b\u573a\u666f\u3002<\/p>\n\n\n\n

5.<\/strong>\u662f\u5426\u5b58\u5728\u6027\u80fd\u5dee\u5f02\uff1f<\/strong><\/p>\n\n\n\n

\u662f\u7684\uff0c\u901a\u5e38\u60c5\u51b5\u4e0b\uff0cLock\u7684\u6027\u80fd\u7565\u9ad8\u4e8esynchronized\uff0c\u5c24\u5176\u662f\u5728\u9ad8\u5e76\u53d1\u73af\u5883\u4e0b\u3002\u4f46\u5728\u4e00\u4e9b\u7b80\u5355\u7684\u573a\u666f\u4e2d\uff0c\u6027\u80fd\u5dee\u5f02\u53ef\u80fd\u4e0d\u592a\u660e\u663e\uff0c\u56e0\u6b64\u5728\u9009\u62e9\u65f6\u9700\u8981\u8003\u8651\u5177\u4f53\u7684\u4f7f\u7528\u60c5\u51b5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Java\u4e2d\u7684\u591a\u7ebf\u7a0b\u7f16\u7a0b\u662f\u5e38\u89c1\u7684\u9700\u6c42\uff0c\u800c\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002\u5728Java\u4e2d\uff0csynchroni […]","protected":false},"author":5,"featured_media":65922,"comment_status":"closed","ping_status":"closed","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\/65917"}],"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\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=65917"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/65917\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/65922"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=65917"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=65917"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=65917"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}