{"id":520,"date":"2016-09-23T09:32:08","date_gmt":"2016-09-23T09:32:08","guid":{"rendered":"http:\/\/lg.yusemo.com\/?p=520"},"modified":"2016-09-23T09:32:08","modified_gmt":"2016-09-23T09:32:08","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3java%e5%86%85%e5%ad%98%e6%a8%a1%e5%9e%8b%ef%bc%88%e4%b8%80%ef%bc%89-%e5%9f%ba%e7%a1%80","status":"publish","type":"post","link":"https:\/\/lg.yusemo.com\/?p=520","title":{"rendered":"\u6df1\u5165\u7406\u89e3Java\u5185\u5b58\u6a21\u578b\uff08\u4e00\uff09\u2014\u2014\u57fa\u7840"},"content":{"rendered":"<p>\u5e76\u53d1\u7f16\u7a0b\u6a21\u578b\u7684\u5206\u7c7b<\/p>\n<p>\u5728\u5e76\u53d1\u7f16\u7a0b\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u5904\u7406\u4e24\u4e2a\u5173\u952e\u95ee\u9898\uff1a\u7ebf\u7a0b\u4e4b\u95f4\u5982\u4f55\u901a\u4fe1\u53ca\u7ebf\u7a0b\u4e4b\u95f4\u5982\u4f55\u540c\u6b65\uff08\u8fd9\u91cc\u7684\u7ebf\u7a0b\u662f\u6307\u5e76\u53d1\u6267\u884c\u7684\u6d3b\u52a8\u5b9e\u4f53\uff09\u3002\u901a\u4fe1\u662f\u6307\u7ebf\u7a0b\u4e4b\u95f4\u4ee5\u4f55\u79cd\u673a\u5236\u6765\u4ea4\u6362\u4fe1\u606f\u3002\u5728\u547d\u4ee4\u5f0f\u7f16\u7a0b\u4e2d\uff0c\u7ebf\u7a0b\u4e4b\u95f4\u7684\u901a\u4fe1\u673a\u5236\u6709\u4e24\u79cd\uff1a<strong>\u5171\u4eab\u5185\u5b58\u548c\u6d88\u606f\u4f20\u9012\u3002<\/strong><\/p>\n<p>\u5728\u5171\u4eab\u5185\u5b58\u7684\u5e76\u53d1\u6a21\u578b\u91cc\uff0c\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u7a0b\u5e8f\u7684\u516c\u5171\u72b6\u6001\uff0c\u7ebf\u7a0b\u4e4b\u95f4\u901a\u8fc7\u5199-\u8bfb\u5185\u5b58\u4e2d\u7684\u516c\u5171\u72b6\u6001\u6765\u9690\u5f0f\u8fdb\u884c\u901a\u4fe1\u3002\u5728\u6d88\u606f\u4f20\u9012\u7684\u5e76\u53d1\u6a21\u578b\u91cc\uff0c\u7ebf\u7a0b\u4e4b\u95f4\u6ca1\u6709\u516c\u5171\u72b6\u6001\uff0c\u7ebf\u7a0b\u4e4b\u95f4\u5fc5\u987b\u901a\u8fc7\u660e\u786e\u7684\u53d1\u9001\u6d88\u606f\u6765\u663e\u5f0f\u8fdb\u884c\u901a\u4fe1\u3002<\/p>\n<p>\u540c\u6b65\u662f\u6307\u7a0b\u5e8f\u7528\u4e8e\u63a7\u5236\u4e0d\u540c\u7ebf\u7a0b\u4e4b\u95f4\u64cd\u4f5c\u53d1\u751f\u76f8\u5bf9\u987a\u5e8f\u7684\u673a\u5236\u3002\u5728\u5171\u4eab\u5185\u5b58\u5e76\u53d1\u6a21\u578b\u91cc\uff0c\u540c\u6b65\u662f\u663e\u5f0f\u8fdb\u884c\u7684\u3002\u7a0b\u5e8f\u5458\u5fc5\u987b\u663e\u5f0f\u6307\u5b9a\u67d0\u4e2a\u65b9\u6cd5\u6216\u67d0\u6bb5\u4ee3\u7801\u9700\u8981\u5728\u7ebf\u7a0b\u4e4b\u95f4\u4e92\u65a5\u6267\u884c\u3002\u5728\u6d88\u606f\u4f20\u9012\u7684\u5e76\u53d1\u6a21\u578b\u91cc\uff0c\u7531\u4e8e\u6d88\u606f\u7684\u53d1\u9001\u5fc5\u987b\u5728\u6d88\u606f\u7684\u63a5\u6536\u4e4b\u524d\uff0c\u56e0\u6b64\u540c\u6b65\u662f\u9690\u5f0f\u8fdb\u884c\u7684\u3002<\/p>\n<p><strong>Java\u7684\u5e76\u53d1\u91c7\u7528\u7684\u662f\u5171\u4eab\u5185\u5b58\u6a21\u578b\uff0cJava\u7ebf\u7a0b\u4e4b\u95f4\u7684\u901a\u4fe1\u603b\u662f\u9690\u5f0f\u8fdb\u884c<\/strong>\uff0c\u6574\u4e2a\u901a\u4fe1\u8fc7\u7a0b\u5bf9\u7a0b\u5e8f\u5458\u5b8c\u5168\u900f\u660e\u3002\u5982\u679c\u7f16\u5199\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u7684Java\u7a0b\u5e8f\u5458\u4e0d\u7406\u89e3\u9690\u5f0f\u8fdb\u884c\u7684\u7ebf\u7a0b\u4e4b\u95f4\u901a\u4fe1\u7684\u5de5\u4f5c\u673a\u5236\uff0c\u5f88\u53ef\u80fd\u4f1a\u9047\u5230\u5404\u79cd\u5947\u602a\u7684\u5185\u5b58\u53ef\u89c1\u6027\u95ee\u9898\u3002<\/p>\n<p>Java\u5185\u5b58\u6a21\u578b\u7684\u62bd\u8c61<\/p>\n<p>\u5728java\u4e2d\uff0c\u6240\u6709\u5b9e\u4f8b\u57df\u3001\u9759\u6001\u57df\u548c\u6570\u7ec4\u5143\u7d20\u5b58\u50a8\u5728\u5806\u5185\u5b58\u4e2d\uff0c\u5806\u5185\u5b58\u5728\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\uff08\u672c\u6587\u4f7f\u7528\u201c\u5171\u4eab\u53d8\u91cf\u201d\u8fd9\u4e2a\u672f\u8bed\u4ee3\u6307\u5b9e\u4f8b\u57df\uff0c\u9759\u6001\u57df\u548c\u6570\u7ec4\u5143\u7d20\uff09\u3002\u5c40\u90e8\u53d8\u91cf\uff08Local variables\uff09\uff0c\u65b9\u6cd5\u5b9a\u4e49\u53c2\u6570\uff08java\u8bed\u8a00\u89c4\u8303\u79f0\u4e4b\u4e3aformal method parameters\uff09\u548c\u5f02\u5e38\u5904\u7406\u5668\u53c2\u6570\uff08exception handler parameters\uff09\u4e0d\u4f1a\u5728\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\uff0c\u5b83\u4eec\u4e0d\u4f1a\u6709\u5185\u5b58\u53ef\u89c1\u6027\u95ee\u9898\uff0c\u4e5f\u4e0d\u53d7\u5185\u5b58\u6a21\u578b\u7684\u5f71\u54cd\u3002<\/p>\n<p>Java\u7ebf\u7a0b\u4e4b\u95f4\u7684\u901a\u4fe1\u7531Java\u5185\u5b58\u6a21\u578b\uff08\u672c\u6587\u7b80\u79f0\u4e3aJMM\uff09\u63a7\u5236\uff0c<strong>JMM\u51b3\u5b9a\u4e00\u4e2a\u7ebf\u7a0b\u5bf9\u5171\u4eab\u53d8\u91cf\u7684\u5199\u5165\u4f55\u65f6\u5bf9\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u89c1<\/strong>\u3002\u4ece\u62bd\u8c61\u7684\u89d2\u5ea6\u6765\u770b\uff0cJMM\u5b9a\u4e49\u4e86\u7ebf\u7a0b\u548c\u4e3b\u5185\u5b58\u4e4b\u95f4\u7684\u62bd\u8c61\u5173\u7cfb\uff1a\u7ebf\u7a0b\u4e4b\u95f4\u7684\u5171\u4eab\u53d8\u91cf\u5b58\u50a8\u5728\u4e3b\u5185\u5b58\uff08main memory\uff09\u4e2d\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u4e00\u4e2a\u79c1\u6709\u7684\u672c\u5730\u5185\u5b58\uff08local memory\uff09\uff0c\u672c\u5730\u5185\u5b58\u4e2d\u5b58\u50a8\u4e86\u8be5\u7ebf\u7a0b\u4ee5\u8bfb\/\u5199\u5171\u4eab\u53d8\u91cf\u7684\u526f\u672c\u3002\u672c\u5730\u5185\u5b58\u662fJMM\u7684\u4e00\u4e2a\u62bd\u8c61\u6982\u5ff5\uff0c\u5e76\u4e0d\u771f\u5b9e\u5b58\u5728\u3002\u5b83\u6db5\u76d6\u4e86\u7f13\u5b58\uff0c\u5199\u7f13\u51b2\u533a\uff0c\u5bc4\u5b58\u5668\u4ee5\u53ca\u5176\u4ed6\u7684\u786c\u4ef6\u548c\u7f16\u8bd1\u5668\u4f18\u5316\u3002Java\u5185\u5b58\u6a21\u578b\u7684\u62bd\u8c61\u793a\u610f\u56fe\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-524\" src=\"http:\/\/lg.yusemo.com\/wp-content\/uploads\/2016\/09\/EECD8725-36F3-45A5-BBF6-68E1751D6AB6.png\" alt=\"eecd8725-36f3-45a5-bbf6-68e1751d6ab6\" width=\"423\" height=\"377\" \/><\/p>\n<p>\u4ece\u4e0a\u56fe\u6765\u770b\uff0c\u7ebf\u7a0bA\u4e0e\u7ebf\u7a0bB\u4e4b\u95f4\u5982\u8981\u901a\u4fe1\u7684\u8bdd\uff0c\u5fc5\u987b\u8981\u7ecf\u5386\u4e0b\u97622\u4e2a\u6b65\u9aa4\uff1a<\/p>\n<ul>\n<li>\u9996\u5148\uff0c\u7ebf\u7a0bA\u628a\u672c\u5730\u5185\u5b58A\u4e2d\u66f4\u65b0\u8fc7\u7684\u5171\u4eab\u53d8\u91cf\u5237\u65b0\u5230\u4e3b\u5185\u5b58\u4e2d\u53bb\u3002<\/li>\n<li>\u7136\u540e\uff0c\u7ebf\u7a0bB\u5230\u4e3b\u5185\u5b58\u4e2d\u53bb\u8bfb\u53d6\u7ebf\u7a0bA\u4e4b\u524d\u5df2\u66f4\u65b0\u8fc7\u7684\u5171\u4eab\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<p>\u4e0b\u9762\u901a\u8fc7\u793a\u610f\u56fe\u6765\u8bf4\u660e\u8fd9\u4e24\u4e2a\u6b65\u9aa4\uff1a<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-525\" src=\"http:\/\/lg.yusemo.com\/wp-content\/uploads\/2016\/09\/F145FA6D-A2B4-4DB8-B6DC-7CC894046951.png\" alt=\"f145fa6d-a2b4-4db8-b6dc-7cc894046951\" width=\"440\" height=\"334\" \/><\/p>\n<p>\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u672c\u5730\u5185\u5b58A\u548cB\u6709\u4e3b\u5185\u5b58\u4e2d\u5171\u4eab\u53d8\u91cfx\u7684\u526f\u672c\u3002\u5047\u8bbe\u521d\u59cb\u65f6\uff0c\u8fd9\u4e09\u4e2a\u5185\u5b58\u4e2d\u7684x\u503c\u90fd\u4e3a0\u3002\u7ebf\u7a0bA\u5728\u6267\u884c\u65f6\uff0c\u628a\u66f4\u65b0\u540e\u7684x\u503c\uff08\u5047\u8bbe\u503c\u4e3a1\uff09\u4e34\u65f6\u5b58\u653e\u5728\u81ea\u5df1\u7684\u672c\u5730\u5185\u5b58A\u4e2d\u3002\u5f53\u7ebf\u7a0bA\u548c\u7ebf\u7a0bB\u9700\u8981\u901a\u4fe1\u65f6\uff0c\u7ebf\u7a0bA\u9996\u5148\u4f1a\u628a\u81ea\u5df1\u672c\u5730\u5185\u5b58\u4e2d\u4fee\u6539\u540e\u7684x\u503c\u5237\u65b0\u5230\u4e3b\u5185\u5b58\u4e2d\uff0c\u6b64\u65f6\u4e3b\u5185\u5b58\u4e2d\u7684x\u503c\u53d8\u4e3a\u4e861\u3002\u968f\u540e\uff0c\u7ebf\u7a0bB\u5230\u4e3b\u5185\u5b58\u4e2d\u53bb\u8bfb\u53d6\u7ebf\u7a0bA\u66f4\u65b0\u540e\u7684x\u503c\uff0c\u6b64\u65f6\u7ebf\u7a0bB\u7684\u672c\u5730\u5185\u5b58\u7684x\u503c\u4e5f\u53d8\u4e3a\u4e861\u3002<\/p>\n<p>\u4ece\u6574\u4f53\u6765\u770b\uff0c\u8fd9\u4e24\u4e2a\u6b65\u9aa4\u5b9e\u8d28\u4e0a\u662f\u7ebf\u7a0bA\u5728\u5411\u7ebf\u7a0bB\u53d1\u9001\u6d88\u606f\uff0c\u800c\u4e14\u8fd9\u4e2a\u901a\u4fe1\u8fc7\u7a0b\u5fc5\u987b\u8981\u7ecf\u8fc7\u4e3b\u5185\u5b58\u3002JMM\u901a\u8fc7\u63a7\u5236\u4e3b\u5185\u5b58\u4e0e\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u672c\u5730\u5185\u5b58\u4e4b\u95f4\u7684\u4ea4\u4e92\uff0c\u6765\u4e3ajava\u7a0b\u5e8f\u5458\u63d0\u4f9b\u5185\u5b58\u53ef\u89c1\u6027\u4fdd\u8bc1\u3002<\/p>\n<p><strong>\u91cd\u6392\u5e8f<\/strong><\/p>\n<p>\u5728\u6267\u884c\u7a0b\u5e8f\u65f6\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u7f16\u8bd1\u5668\u548c\u5904\u7406\u5668\u5e38\u5e38\u4f1a\u5bf9\u6307\u4ee4\u505a\u91cd\u6392\u5e8f\u3002\u91cd\u6392\u5e8f\u5206\u4e09\u79cd\u7c7b\u578b\uff1a<\/p>\n<ul>\n<li>\u7f16\u8bd1\u5668\u4f18\u5316\u7684\u91cd\u6392\u5e8f\u3002\u7f16\u8bd1\u5668\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\u3002<\/li>\n<li>\u6307\u4ee4\u7ea7\u5e76\u884c\u7684\u91cd\u6392\u5e8f\u3002\u73b0\u4ee3\u5904\u7406\u5668\u91c7\u7528\u4e86\u6307\u4ee4\u7ea7\u5e76\u884c\u6280\u672f\uff08Instruction-Level Parallelism\uff0c ILP\uff09\u6765\u5c06\u591a\u6761\u6307\u4ee4\u91cd\u53e0\u6267\u884c\u3002\u5982\u679c\u4e0d\u5b58\u5728\u6570\u636e\u4f9d\u8d56\u6027\uff0c\u5904\u7406\u5668\u53ef\u4ee5\u6539\u53d8\u8bed\u53e5\u5bf9\u5e94\u673a\u5668\u6307\u4ee4\u7684\u6267\u884c\u987a\u5e8f\u3002<\/li>\n<li>\u5185\u5b58\u7cfb\u7edf\u7684\u91cd\u6392\u5e8f\u3002\u7531\u4e8e\u5904\u7406\u5668\u4f7f\u7528\u7f13\u5b58\u548c\u8bfb\/\u5199\u7f13\u51b2\u533a\uff0c\u8fd9\u4f7f\u5f97\u52a0\u8f7d\u548c\u5b58\u50a8\u64cd\u4f5c\u770b\u4e0a\u53bb\u53ef\u80fd\u662f\u5728\u4e71\u5e8f\u6267\u884c\u3002<\/li>\n<\/ul>\n<p>\u4ecejava\u6e90\u4ee3\u7801\u5230\u6700\u7ec8\u5b9e\u9645\u6267\u884c\u7684\u6307\u4ee4\u5e8f\u5217\uff0c\u4f1a\u5206\u522b\u7ecf\u5386\u4e0b\u9762\u4e09\u79cd\u91cd\u6392\u5e8f\uff1a<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-522\" src=\"http:\/\/lg.yusemo.com\/wp-content\/uploads\/2016\/09\/696D9E7D-E618-4FDB-83D4-27E30610809F.png\" alt=\"696d9e7d-e618-4fdb-83d4-27e30610809f\" width=\"529\" height=\"76\" \/><\/p>\n<p>\u4e0a\u8ff0\u76841\u5c5e\u4e8e\u7f16\u8bd1\u5668\u91cd\u6392\u5e8f\uff0c2\u548c3\u5c5e\u4e8e\u5904\u7406\u5668\u91cd\u6392\u5e8f\u3002\u8fd9\u4e9b\u91cd\u6392\u5e8f\u90fd\u53ef\u80fd\u4f1a\u5bfc\u81f4\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u51fa\u73b0\u5185\u5b58\u53ef\u89c1\u6027\u95ee\u9898\u3002\u5bf9\u4e8e\u7f16\u8bd1\u5668\uff0cJMM\u7684\u7f16\u8bd1\u5668\u91cd\u6392\u5e8f\u89c4\u5219\u4f1a\u7981\u6b62\u7279\u5b9a\u7c7b\u578b\u7684\u7f16\u8bd1\u5668\u91cd\u6392\u5e8f\uff08\u4e0d\u662f\u6240\u6709\u7684\u7f16\u8bd1\u5668\u91cd\u6392\u5e8f\u90fd\u8981\u7981\u6b62\uff09\u3002\u5bf9\u4e8e\u5904\u7406\u5668\u91cd\u6392\u5e8f\uff0cJMM\u7684\u5904\u7406\u5668\u91cd\u6392\u5e8f\u89c4\u5219\u4f1a\u8981\u6c42java\u7f16\u8bd1\u5668\u5728\u751f\u6210\u6307\u4ee4\u5e8f\u5217\u65f6\uff0c\u63d2\u5165\u7279\u5b9a\u7c7b\u578b\u7684\u5185\u5b58\u5c4f\u969c\uff08memory barriers\uff0cintel\u79f0\u4e4b\u4e3amemory fence\uff09\u6307\u4ee4\uff0c\u901a\u8fc7\u5185\u5b58\u5c4f\u969c\u6307\u4ee4\u6765\u7981\u6b62\u7279\u5b9a\u7c7b\u578b\u7684\u5904\u7406\u5668\u91cd\u6392\u5e8f\uff08\u4e0d\u662f\u6240\u6709\u7684\u5904\u7406\u5668\u91cd\u6392\u5e8f\u90fd\u8981\u7981\u6b62\uff09\u3002<\/p>\n<p>JMM\u5c5e\u4e8e\u8bed\u8a00\u7ea7\u7684\u5185\u5b58\u6a21\u578b\uff0c\u5b83\u786e\u4fdd\u5728\u4e0d\u540c\u7684\u7f16\u8bd1\u5668\u548c\u4e0d\u540c\u7684\u5904\u7406\u5668\u5e73\u53f0\u4e4b\u4e0a\uff0c\u901a\u8fc7\u7981\u6b62\u7279\u5b9a\u7c7b\u578b\u7684\u7f16\u8bd1\u5668\u91cd\u6392\u5e8f\u548c\u5904\u7406\u5668\u91cd\u6392\u5e8f\uff0c\u4e3a\u7a0b\u5e8f\u5458\u63d0\u4f9b\u4e00\u81f4\u7684\u5185\u5b58\u53ef\u89c1\u6027\u4fdd\u8bc1\u3002<\/p>\n<p>\u5904\u7406\u5668\u91cd\u6392\u5e8f\u4e0e\u5185\u5b58\u5c4f\u969c\u6307\u4ee4<\/p>\n<p>\u73b0\u4ee3\u7684\u5904\u7406\u5668\u4f7f\u7528\u5199\u7f13\u51b2\u533a\u6765\u4e34\u65f6\u4fdd\u5b58\u5411\u5185\u5b58\u5199\u5165\u7684\u6570\u636e\u3002\u5199\u7f13\u51b2\u533a\u53ef\u4ee5\u4fdd\u8bc1\u6307\u4ee4\u6d41\u6c34\u7ebf\u6301\u7eed\u8fd0\u884c\uff0c\u5b83\u53ef\u4ee5\u907f\u514d\u7531\u4e8e\u5904\u7406\u5668\u505c\u987f\u4e0b\u6765\u7b49\u5f85\u5411\u5185\u5b58\u5199\u5165\u6570\u636e\u800c\u4ea7\u751f\u7684\u5ef6\u8fdf\u3002\u540c\u65f6\uff0c\u901a\u8fc7\u4ee5\u6279\u5904\u7406\u7684\u65b9\u5f0f\u5237\u65b0\u5199\u7f13\u51b2\u533a\uff0c\u4ee5\u53ca\u5408\u5e76\u5199\u7f13\u51b2\u533a\u4e2d\u5bf9\u540c\u4e00\u5185\u5b58\u5730\u5740\u7684\u591a\u6b21\u5199\uff0c\u53ef\u4ee5\u51cf\u5c11\u5bf9\u5185\u5b58\u603b\u7ebf\u7684\u5360\u7528\u3002\u867d\u7136\u5199\u7f13\u51b2\u533a\u6709\u8fd9\u4e48\u591a\u597d\u5904\uff0c\u4f46\u6bcf\u4e2a\u5904\u7406\u5668\u4e0a\u7684\u5199\u7f13\u51b2\u533a\uff0c\u4ec5\u4ec5\u5bf9\u5b83\u6240\u5728\u7684\u5904\u7406\u5668\u53ef\u89c1\u3002\u8fd9\u4e2a\u7279\u6027\u4f1a\u5bf9\u5185\u5b58\u64cd\u4f5c\u7684\u6267\u884c\u987a\u5e8f\u4ea7\u751f\u91cd\u8981\u7684\u5f71\u54cd\uff1a\u5904\u7406\u5668\u5bf9\u5185\u5b58\u7684\u8bfb\/\u5199\u64cd\u4f5c\u7684\u6267\u884c\u987a\u5e8f\uff0c\u4e0d\u4e00\u5b9a\u4e0e\u5185\u5b58\u5b9e\u9645\u53d1\u751f\u7684\u8bfb\/\u5199\u64cd\u4f5c\u987a\u5e8f\u4e00\u81f4\uff01\u4e3a\u4e86\u5177\u4f53\u8bf4\u660e\uff0c\u8bf7\u770b\u4e0b\u9762\u793a\u4f8b\uff1a<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-526\" src=\"http:\/\/lg.yusemo.com\/wp-content\/uploads\/2016\/09\/QQ20160923-0.png\" alt=\"qq20160923-0\" width=\"994\" height=\"240\" \/><\/p>\n<p>\u521d\u59cb\u72b6\u6001\uff1aa = b = 0<br \/>\n\u5904\u7406\u5668\u5141\u8bb8\u6267\u884c\u540e\u5f97\u5230\u7ed3\u679c\uff1ax = y = 0<\/p>\n<p>\u5047\u8bbe\u5904\u7406\u5668A\u548c\u5904\u7406\u5668B\u6309\u7a0b\u5e8f\u7684\u987a\u5e8f\u5e76\u884c\u6267\u884c\u5185\u5b58\u8bbf\u95ee\uff0c\u6700\u7ec8\u5374\u53ef\u80fd\u5f97\u5230x = y = 0\u7684\u7ed3\u679c\u3002\u5177\u4f53\u7684\u539f\u56e0\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-523\" src=\"http:\/\/lg.yusemo.com\/wp-content\/uploads\/2016\/09\/4016E85C-2F2E-45E9-9626-39831926C9B8.png\" alt=\"4016e85c-2f2e-45e9-9626-39831926c9b8\" width=\"412\" height=\"303\" \/><\/p>\n<p>\u8fd9\u91cc\u5904\u7406\u5668A\u548c\u5904\u7406\u5668B\u53ef\u4ee5\u540c\u65f6\u628a\u5171\u4eab\u53d8\u91cf\u5199\u5165\u81ea\u5df1\u7684\u5199\u7f13\u51b2\u533a\uff08A1\uff0cB1\uff09\uff0c\u7136\u540e\u4ece\u5185\u5b58\u4e2d\u8bfb\u53d6\u53e6\u4e00\u4e2a\u5171\u4eab\u53d8\u91cf\uff08A2\uff0cB2\uff09\uff0c\u6700\u540e\u624d\u628a\u81ea\u5df1\u5199\u7f13\u5b58\u533a\u4e2d\u4fdd\u5b58\u7684\u810f\u6570\u636e\u5237\u65b0\u5230\u5185\u5b58\u4e2d\uff08A3\uff0cB3\uff09\u3002\u5f53\u4ee5\u8fd9\u79cd\u65f6\u5e8f\u6267\u884c\u65f6\uff0c\u7a0b\u5e8f\u5c31\u53ef\u4ee5\u5f97\u5230x = y = 0\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u4ece\u5185\u5b58\u64cd\u4f5c\u5b9e\u9645\u53d1\u751f\u7684\u987a\u5e8f\u6765\u770b\uff0c\u76f4\u5230\u5904\u7406\u5668A\u6267\u884cA3\u6765\u5237\u65b0\u81ea\u5df1\u7684\u5199\u7f13\u5b58\u533a\uff0c\u5199\u64cd\u4f5cA1\u624d\u7b97\u771f\u6b63\u6267\u884c\u4e86\u3002\u867d\u7136\u5904\u7406\u5668A\u6267\u884c\u5185\u5b58\u64cd\u4f5c\u7684\u987a\u5e8f\u4e3a\uff1aA1-&gt;A2\uff0c\u4f46\u5185\u5b58\u64cd\u4f5c\u5b9e\u9645\u53d1\u751f\u7684\u987a\u5e8f\u5374\u662f\uff1aA2-&gt;A1\u3002\u6b64\u65f6\uff0c\u5904\u7406\u5668A\u7684\u5185\u5b58\u64cd\u4f5c\u987a\u5e8f\u88ab\u91cd\u6392\u5e8f\u4e86\uff08\u5904\u7406\u5668B\u7684\u60c5\u51b5\u548c\u5904\u7406\u5668A\u4e00\u6837\uff0c\u8fd9\u91cc\u5c31\u4e0d\u8d58\u8ff0\u4e86\uff09\u3002<\/p>\n<p>\u8fd9\u91cc\u7684\u5173\u952e\u662f\uff0c\u7531\u4e8e\u5199\u7f13\u51b2\u533a\u4ec5\u5bf9\u81ea\u5df1\u7684\u5904\u7406\u5668\u53ef\u89c1\uff0c\u5b83\u4f1a\u5bfc\u81f4\u5904\u7406\u5668\u6267\u884c\u5185\u5b58\u64cd\u4f5c\u7684\u987a\u5e8f\u53ef\u80fd\u4f1a\u4e0e\u5185\u5b58\u5b9e\u9645\u7684\u64cd\u4f5c\u6267\u884c\u987a\u5e8f\u4e0d\u4e00\u81f4\u3002\u7531\u4e8e\u73b0\u4ee3\u7684\u5904\u7406\u5668\u90fd\u4f1a\u4f7f\u7528\u5199\u7f13\u51b2\u533a\uff0c\u56e0\u6b64\u73b0\u4ee3\u7684\u5904\u7406\u5668\u90fd\u4f1a\u5141\u8bb8\u5bf9\u5199-\u8bfb\u64cd\u505a\u91cd\u6392\u5e8f\u3002<\/p>\n<p>\u4e0b\u9762\u662f\u5e38\u89c1\u5904\u7406\u5668\u5141\u8bb8\u7684\u91cd\u6392\u5e8f\u7c7b\u578b\u7684\u5217\u8868\uff1a<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-527\" src=\"http:\/\/lg.yusemo.com\/wp-content\/uploads\/2016\/09\/QQ20160923-1.png\" alt=\"qq20160923-1\" width=\"1196\" height=\"258\" \/><\/p>\n<p>\u4e0a\u8868\u5355\u5143\u683c\u4e2d\u7684\u201cN\u201d\u8868\u793a\u5904\u7406\u5668\u4e0d\u5141\u8bb8\u4e24\u4e2a\u64cd\u4f5c\u91cd\u6392\u5e8f\uff0c\u201cY\u201d\u8868\u793a\u5141\u8bb8\u91cd\u6392\u5e8f\u3002<\/p>\n<p>\u4ece\u4e0a\u8868\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff1a\u5e38\u89c1\u7684\u5904\u7406\u5668\u90fd\u5141\u8bb8Store-Load\u91cd\u6392\u5e8f\uff1b\u5e38\u89c1\u7684\u5904\u7406\u5668\u90fd\u4e0d\u5141\u8bb8\u5bf9\u5b58\u5728\u6570\u636e\u4f9d\u8d56\u7684\u64cd\u4f5c\u505a\u91cd\u6392\u5e8f\u3002sparc-TSO\u548cx86\u62e5\u6709\u76f8\u5bf9\u8f83\u5f3a\u7684\u5904\u7406\u5668\u5185\u5b58\u6a21\u578b\uff0c\u5b83\u4eec\u4ec5\u5141\u8bb8\u5bf9\u5199-\u8bfb\u64cd\u4f5c\u505a\u91cd\u6392\u5e8f\uff08\u56e0\u4e3a\u5b83\u4eec\u90fd\u4f7f\u7528\u4e86\u5199\u7f13\u51b2\u533a\uff09\u3002<\/p>\n<p>\u203b\u6ce81\uff1asparc-TSO\u662f\u6307\u4ee5TSO(Total Store Order)\u5185\u5b58\u6a21\u578b\u8fd0\u884c\u65f6\uff0csparc\u5904\u7406\u5668\u7684\u7279\u6027\u3002<\/p>\n<p>\u203b\u6ce82\uff1a\u4e0a\u8868\u4e2d\u7684x86\u5305\u62ecx64\u53caAMD64\u3002<\/p>\n<p>\u203b\u6ce83\uff1a\u7531\u4e8eARM\u5904\u7406\u5668\u7684\u5185\u5b58\u6a21\u578b\u4e0ePowerPC\u5904\u7406\u5668\u7684\u5185\u5b58\u6a21\u578b\u975e\u5e38\u7c7b\u4f3c\uff0c\u672c\u6587\u5c06\u5ffd\u7565\u5b83\u3002<\/p>\n<p>\u203b\u6ce84\uff1a\u6570\u636e\u4f9d\u8d56\u6027\u540e\u6587\u4f1a\u4e13\u95e8\u8bf4\u660e\u3002<\/p>\n<p>\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\u5185\u5b58\u5c4f\u969c\u6307\u4ee4\u6765\u7981\u6b62\u7279\u5b9a\u7c7b\u578b\u7684\u5904\u7406\u5668\u91cd\u6392\u5e8f\u3002JMM\u628a\u5185\u5b58\u5c4f\u969c\u6307\u4ee4\u5206\u4e3a\u4e0b\u5217\u56db\u7c7b\uff1a<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-528\" src=\"http:\/\/lg.yusemo.com\/wp-content\/uploads\/2016\/09\/QQ20160923-2.png\" alt=\"qq20160923-2\" width=\"1190\" height=\"606\" \/><\/p>\n<p>\u786e\u4fddStore1\u6570\u636e\u5bf9\u5176\u4ed6\u5904\u7406\u5668\u53d8\u5f97\u53ef\u89c1\uff08\u6307\u5237\u65b0\u5230\u5185\u5b58\uff09\uff0c\u4e4b\u524d\u4e8eLoad2\u53ca\u6240\u6709\u540e\u7eed\u88c5\u8f7d\u6307\u4ee4\u7684\u88c5\u8f7d\u3002StoreLoad Barriers\u4f1a\u4f7f\u8be5\u5c4f\u969c\u4e4b\u524d\u7684\u6240\u6709\u5185\u5b58\u8bbf\u95ee\u6307\u4ee4\uff08\u5b58\u50a8\u548c\u88c5\u8f7d\u6307\u4ee4\uff09\u5b8c\u6210\u4e4b\u540e\uff0c\u624d\u6267\u884c\u8be5\u5c4f\u969c\u4e4b\u540e\u7684\u5185\u5b58\u8bbf\u95ee\u6307\u4ee4\u3002<\/p>\n<p>StoreLoad Barriers\u662f\u4e00\u4e2a\u201c\u5168\u80fd\u578b\u201d\u7684\u5c4f\u969c\uff0c\u5b83\u540c\u65f6\u5177\u6709\u5176\u4ed6\u4e09\u4e2a\u5c4f\u969c\u7684\u6548\u679c\u3002\u73b0\u4ee3\u7684\u591a\u5904\u7406\u5668\u5927\u90fd\u652f\u6301\u8be5\u5c4f\u969c\uff08\u5176\u4ed6\u7c7b\u578b\u7684\u5c4f\u969c\u4e0d\u4e00\u5b9a\u88ab\u6240\u6709\u5904\u7406\u5668\u652f\u6301\uff09\u3002\u6267\u884c\u8be5\u5c4f\u969c\u5f00\u9500\u4f1a\u5f88\u6602\u8d35\uff0c\u56e0\u4e3a\u5f53\u524d\u5904\u7406\u5668\u901a\u5e38\u8981\u628a\u5199\u7f13\u51b2\u533a\u4e2d\u7684\u6570\u636e\u5168\u90e8\u5237\u65b0\u5230\u5185\u5b58\u4e2d\uff08buffer fully flush\uff09\u3002<\/p>\n<p>happens-before<\/p>\n<p>\u4eceJDK5\u5f00\u59cb\uff0cjava\u4f7f\u7528\u65b0\u7684JSR -133\u5185\u5b58\u6a21\u578b\uff08\u672c\u6587\u9664\u975e\u7279\u522b\u8bf4\u660e\uff0c\u9488\u5bf9\u7684\u90fd\u662fJSR- 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src=\"http:\/\/lg.yusemo.com\/wp-content\/uploads\/2016\/09\/7DA02706-E276-4497-8717-34E5EDB299D1.png\" alt=\"7da02706-e276-4497-8717-34e5edb299d1\" width=\"511\" height=\"396\" \/><\/p>\n<p>\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u4e00\u4e2ahappens-before\u89c4\u5219\u901a\u5e38\u5bf9\u5e94\u4e8e\u591a\u4e2a\u7f16\u8bd1\u5668\u91cd\u6392\u5e8f\u89c4\u5219\u548c\u5904\u7406\u5668\u91cd\u6392\u5e8f\u89c4\u5219\u3002\u5bf9\u4e8ejava\u7a0b\u5e8f\u5458\u6765\u8bf4\uff0chappens-before\u89c4\u5219\u7b80\u5355\u6613\u61c2\uff0c\u5b83\u907f\u514d\u7a0b\u5e8f\u5458\u4e3a\u4e86\u7406\u89e3JMM\u63d0\u4f9b\u7684\u5185\u5b58\u53ef\u89c1\u6027\u4fdd\u8bc1\u800c\u53bb\u5b66\u4e60\u590d\u6742\u7684\u91cd\u6392\u5e8f\u89c4\u5219\u4ee5\u53ca\u8fd9\u4e9b\u89c4\u5219\u7684\u5177\u4f53\u5b9e\u73b0<\/p>\n<p>A\u66f4\u65b0\u4e86\u672c\u5730\u526f\u672cx\u7684\u503c\uff0c\u4e0d\u4f1a\u4e3b\u52a8\u5237\u65b0\u5230\u4e3b\u5b58\u4e2d\u5417\uff0c\u5fc5\u987b\u7b49\u5230\u548cB\u901a\u4fe1\u65f6\uff1f<br 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