volatile \u53d8\u91cf\u5177\u6709 synchronized \u7684\u53ef\u89c1\u6027\u7279\u6027\uff0c\u4f46\u662f\u4e0d\u5177\u5907\u539f\u5b50\u6027\u3002\u8fd9\u5c31\u662f\u8bf4\u7ebf\u7a0b\u80fd\u591f\u81ea\u52a8\u53d1\u73b0 volatile \u53d8\u91cf\u7684\u6700\u65b0\u503c\u3002
\nvolatile\u53d8\u91cf\u53ef\u7528\u4e8e\u63d0\u4f9b\u7ebf\u7a0b\u5b89\u5168\uff0c\u4f46\u662f\u53ea\u80fd\u5e94\u7528\u4e8e\u975e\u5e38\u6709\u9650\u7684\u4e00\u7ec4\u7528\u4f8b\uff1a\u591a\u4e2a\u53d8\u91cf\u4e4b\u95f4\u6216\u8005\u67d0\u4e2a\u53d8\u91cf\u7684\u5f53\u524d\u503c\u4e0e\u4fee\u6539\u540e\u503c\u4e4b\u95f4\u6ca1\u6709\u7ea6\u675f\u3002\u56e0\u6b64\uff0c\u5355\u72ec\u4f7f\u7528volatile \u8fd8\u4e0d\u8db3\u4ee5\u5b9e\u73b0\u8ba1\u6570\u5668\u3001\u4e92\u65a5\u9501\u6216\u4efb\u4f55\u5177\u6709\u4e0e\u591a\u4e2a\u53d8\u91cf\u76f8\u5173\u7684\u4e0d\u53d8\u5f0f\uff08Invariants\uff09\u7684\u7c7b\uff08\u4f8b\u5982\u201cstart<=end\u201d\uff09\u3002
\n\u51fa\u4e8e\u7b80\u6613\u6027\u6216\u53ef\u4f38\u7f29\u6027\u7684\u8003\u8651\uff0c\u60a8\u53ef\u80fd\u503e\u5411\u4e8e\u4f7f\u7528 volatile \u53d8\u91cf\u800c\u4e0d\u662f\u9501\u3002\u5f53\u4f7f\u7528 volatile \u53d8\u91cf\u800c\u975e\u9501\u65f6\uff0c\u67d0\u4e9b\u4e60\u60ef\u7528\u6cd5\uff08idiom\uff09\u66f4\u52a0\u6613\u4e8e\u7f16\u7801\u548c\u9605\u8bfb\u3002
\n\u6b64\u5916\uff0cvolatile \u53d8\u91cf\u4e0d\u4f1a\u50cf\u9501\u90a3\u6837\u9020\u6210\u7ebf\u7a0b\u963b\u585e\uff0c\u56e0\u6b64\u4e5f\u5f88\u5c11\u9020\u6210\u53ef\u4f38\u7f29\u6027\u95ee\u9898\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u8bfb\u64cd\u4f5c\u8fdc\u8fdc\u5927\u4e8e\u5199\u64cd\u4f5c\uff0cvolatile \u53d8\u91cf\u8fd8\u53ef\u4ee5\u63d0\u4f9b\u4f18\u4e8e\u9501\u7684\u6027\u80fd\u4f18\u52bf\u3002<\/p>\n
volatile \u7684\u9002\u7528\u573a\u666f
\n1\u3001\u72b6\u6001\u6807\u5fd7
\n\u4e5f\u8bb8\u5b9e\u73b0 volatile \u53d8\u91cf\u7684\u89c4\u8303\u4f7f\u7528\u4ec5\u4ec5\u662f\u4f7f\u7528\u4e00\u4e2a\u5e03\u5c14\u72b6\u6001\u6807\u5fd7\uff0c\u7528\u4e8e\u6307\u793a\u53d1\u751f\u4e86\u4e00\u4e2a\u91cd\u8981\u7684\u4e00\u6b21\u6027\u4e8b\u4ef6\uff0c\u4f8b\u5982\u5b8c\u6210\u521d\u59cb\u5316\u6216\u8bf7\u6c42\u505c\u673a\u3002
\n2\u3001\u4e00\u6b21\u6027\u5b89\u5168\u53d1\u5e03\uff08one-time safe publication\uff09
\n\u5728\u7f3a\u4e4f\u540c\u6b65\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u67d0\u4e2a\u5bf9\u8c61\u5f15\u7528\u7684\u66f4\u65b0\u503c\uff08\u7531\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u5199\u5165\uff09\u548c\u8be5\u5bf9\u8c61\u72b6\u6001\u7684\u65e7\u503c\u540c\u65f6\u5b58\u5728\u3002
\n\u8fd9\u5c31\u662f\u9020\u6210\u8457\u540d\u7684\u53cc\u91cd\u68c0\u67e5\u9501\u5b9a\uff08double-checked-locking\uff09\u95ee\u9898\u7684\u6839\u6e90\uff0c\u5176\u4e2d\u5bf9\u8c61\u5f15\u7528\u5728\u6ca1\u6709\u540c\u6b65\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u8bfb\u64cd\u4f5c\uff0c\u4ea7\u751f\u7684\u95ee\u9898\u662f\u60a8\u53ef\u80fd\u4f1a\u770b\u5230\u4e00\u4e2a\u66f4\u65b0\u7684\u5f15\u7528\uff0c\u4f46\u662f\u4ecd\u7136\u4f1a\u901a\u8fc7\u8be5\u5f15\u7528\u770b\u5230\u4e0d\u5b8c\u5168\u6784\u9020\u7684\u5bf9\u8c61\u3002
\n3\u3001\u72ec\u7acb\u89c2\u5bdf\uff08independent observation\uff09
\n\u5b89\u5168\u4f7f\u7528 volatile \u7684\u53e6\u4e00\u79cd\u7b80\u5355\u6a21\u5f0f\u662f\uff1a\u5b9a\u671f\u201c\u53d1\u5e03\u201d\u89c2\u5bdf\u7ed3\u679c\u4f9b\u7a0b\u5e8f\u5185\u90e8\u4f7f\u7528\u3002<\/p>\n
\u3010\u4f8b\u5982\u3011\u5047\u8bbe\u6709\u4e00\u79cd\u73af\u5883\u4f20\u611f\u5668\u80fd\u591f\u611f\u89c9\u73af\u5883\u6e29\u5ea6\u3002\u4e00\u4e2a\u540e\u53f0\u7ebf\u7a0b\u53ef\u80fd\u4f1a\u6bcf\u9694\u51e0\u79d2\u8bfb\u53d6\u4e00\u6b21\u8be5\u4f20\u611f\u5668\uff0c\u5e76\u66f4\u65b0\u5305\u542b\u5f53\u524d\u6587\u6863\u7684 volatile \u53d8\u91cf\u3002\u7136\u540e\uff0c\u5176\u4ed6\u7ebf\u7a0b\u53ef\u4ee5\u8bfb\u53d6\u8fd9\u4e2a\u53d8\u91cf\uff0c\u4ece\u800c\u968f\u65f6\u80fd\u591f\u770b\u5230\u6700\u65b0\u7684\u6e29\u5ea6\u503c\u3002
\n\u4f7f\u7528\u8be5\u6a21\u5f0f\u7684\u53e6\u4e00\u79cd\u5e94\u7528\u7a0b\u5e8f\u5c31\u662f\u6536\u96c6\u7a0b\u5e8f\u7684\u7edf\u8ba1\u4fe1\u606f\u3002
\n4\u3001volatile bean \u6a21\u5f0f
\nvolatile bean \u6a21\u5f0f\u7684\u57fa\u672c\u539f\u7406\u662f\uff1a\u5f88\u591a\u6846\u67b6\u4e3a\u6613\u53d8\u6570\u636e\u7684\u6301\u6709\u8005\uff08\u4f8b\u5982HttpSession\uff09\u63d0\u4f9b\u4e86\u5bb9\u5668\uff0c\u4f46\u662f\u653e\u5165\u8fd9\u4e9b\u5bb9\u5668\u4e2d\u7684\u5bf9\u8c61\u5fc5\u987b\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002
\n\u5728 volatile bean \u6a21\u5f0f\u4e2d\uff0cJavaBean \u7684\u6240\u6709\u6570\u636e\u6210\u5458\u90fd\u662f volatile \u7c7b\u578b\u7684\uff0c\u5e76\u4e14 getter \u548c setter \u65b9\u6cd5\u5fc5\u987b\u975e\u5e38\u666e\u901a\u2014\u2014\u5373\u4e0d\u5305\u542b\u7ea6\u675f\uff01
\n5\u3001\u5f00\u9500\u8f83\u4f4e\u7684\u201c\u8bfb\u2014\u5199\u9501\u201d\u7b56\u7565
\n\u5982\u679c\u8bfb\u64cd\u4f5c\u8fdc\u8fdc\u8d85\u8fc7\u5199\u64cd\u4f5c\uff0c\u60a8\u53ef\u4ee5\u7ed3\u5408\u4f7f\u7528\u5185\u90e8\u9501\u548c volatile \u53d8\u91cf\u6765\u51cf\u5c11\u516c\u5171\u4ee3\u7801\u8def\u5f84\u7684\u5f00\u9500\u3002
\n\u5982\u4e0b\u663e\u793a\u7684\u7ebf\u7a0b\u5b89\u5168\u7684\u8ba1\u6570\u5668\uff0c\u4f7f\u7528 synchronized \u786e\u4fdd\u589e\u91cf\u64cd\u4f5c\u662f\u539f\u5b50\u7684\uff0c\u5e76\u4f7f\u7528 volatile \u4fdd\u8bc1\u5f53\u524d\u7ed3\u679c\u7684\u53ef\u89c1\u6027\u3002\u5982\u679c\u66f4\u65b0\u4e0d\u9891\u7e41\u7684\u8bdd\uff0c\u8be5\u65b9\u6cd5\u53ef\u5b9e\u73b0\u66f4\u597d\u7684\u6027\u80fd\uff0c\u56e0\u4e3a\u8bfb\u8def\u5f84\u7684\u5f00\u9500\u4ec5\u4ec5\u6d89\u53ca volatile \u8bfb\u64cd\u4f5c\uff0c\u8fd9\u901a\u5e38\u8981\u4f18\u4e8e\u4e00\u4e2a\u65e0\u7ade\u4e89\u7684\u9501\u83b7\u53d6\u7684\u5f00\u9500\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
volatile \u53d8\u91cf\u5177\u6709 synchronized \u7684\u53ef\u89c1\u6027\u7279\u6027\uff0c\u4f46\u662f\u4e0d\u5177\u5907\u539f\u5b50\u6027\u3002\u8fd9\u5c31\u662f\u8bf4\u7ebf\u7a0b\u80fd\u591f\u81ea\u52a8\u53d1\u73b0 […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[99],"tags":[],"class_list":["post-9447","post","type-post","status-publish","format-standard","hentry","category-javabase"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/9447","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=9447"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/9447\/revisions"}],"predecessor-version":[{"id":9448,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/9447\/revisions\/9448"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=9447"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=9447"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=9447"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}