{"id":316,"date":"2022-06-17T16:45:26","date_gmt":"2022-06-17T08:45:26","guid":{"rendered":"http:\/\/blog.kijk.top\/?p=316"},"modified":"2022-06-17T16:45:26","modified_gmt":"2022-06-17T08:45:26","slug":"%e5%90%8c%e6%ad%a5%e3%80%81%e5%bc%82%e6%ad%a5%e3%80%81%e9%98%bb%e5%a1%9e%e4%b8%8e%e9%9d%9e%e9%98%bb%e5%a1%9e","status":"publish","type":"post","link":"http:\/\/blog.kijk.top\/?p=316","title":{"rendered":"\u540c\u6b65\u3001\u5f02\u6b65\u3001\u963b\u585e\u4e0e\u975e\u963b\u585e"},"content":{"rendered":"\n<p>\u8f6c\u8f7d\u4e8e\uff1ahttps:\/\/my.oschina.net\/u\/2822116\/blog\/830589<\/p>\n\n\n\n<p>\u00a0\u8fd1\u6765\u9047\u5230\u4e86\u4e00\u4e9b\u5e38\u89c1\u7684\u6982\u5ff5\uff0c\u5c24\u5176\u662f\u7f51\u7edc\u7f16\u7a0b\u65b9\u9762\u7684\u6982\u5ff5\uff0c\u5982\uff1a\u963b\u585e\u3001\u975e\u963b\u585e\u3001\u5f02\u6b65 I\/O \u7b49\u7b49\uff0c\u5bf9\u4e8e\u8fd9\u4e9b\u6982\u5ff5\u81ea\u5df1\u4e5f\u6ca1\u6709\u592a\u6e05\u6670\u7684\u8ba4\u8bc6\uff0c\u53ea\u662f\u5f88\u6a21\u7cca\u7684\u6982\u5ff5\uff0c\u8bf4\u4e86\u89e3\u5427\u4e5f\u4e86\u89e3\uff0c\u4f46\u662f\u8981\u8ba9\u81ea\u5df1\u51c6\u786e\u7684\u63cf\u8ff0\u6982\u5ff5\u65b9\u9762\u7684\u5177\u4f53\u7ec6\u8282\uff0c\u5374\u8bf4\u7684\u4e0d\u90a3\u4e48\u51c6\u786e\uff0c\u8fd9\u4e5f\u662f\u81ea\u5df1\u5728\u8fd9\u51e0\u4e2a\u65b9\u9762\u4e5f\u6ca1\u6709\u7ec6\u7ec6\u8003\u7a76\u8fc7\u7684\u539f\u56e0\u5427\u3002\u7ecf\u8fc7\u770b\u4e86\u4e9b\u8fd9\u51e0\u4e2a\u6982\u5ff5\u7684\u8d44\u6599\uff0c\u53d1\u73b0\u540c\u6b65\u3001\u5f02\u6b65\u3001\u963b\u585e\u3001\u975e\u963b\u585e\u7684\u6982\u5ff5\u5176\u5b9e\u4e5f\u5e76\u4e0d\u96be\u4ee5\u7406\u89e3\uff0c\u5728\u6b64\u5199\u4e0b\u6b64\u6587\uff0c\u6b22\u8fce\u62cd\u7816\uff0c\u5e0c\u671b\u591a\u591a\u4ea4\u6d41\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2>1 \u540c\u6b65\u4e0e\u5f02\u6b65<\/h2>\n\n\n\n<p><strong><code>\u9996\u5148\u6765\u89e3\u91ca\u540c\u6b65\u548c\u5f02\u6b65\u7684\u6982\u5ff5\uff0c\u8fd9\u4e24\u4e2a\u6982\u5ff5\u4e0e\u6d88\u606f\u7684\u901a\u77e5\u673a\u5236\u6709\u5173\u3002\u4e5f\u5c31\u662f\u540c\u6b65\u4e0e\u5f02\u6b65\u4e3b\u8981\u662f\u4ece\u6d88\u606f\u901a\u77e5\u673a\u5236\u89d2\u5ea6\u6765\u8bf4\u7684\u3002<\/code><\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>1.1 \u6982\u5ff5\u63cf\u8ff0<\/p><\/blockquote>\n\n\n\n<p><code>\u6240\u8c13\u540c\u6b65\u5c31\u662f\u4e00\u4e2a\u4efb\u52a1\u7684\u5b8c\u6210\u9700\u8981\u4f9d\u8d56\u53e6\u5916\u4e00\u4e2a\u4efb\u52a1\u65f6\uff0c\u53ea\u6709\u7b49\u5f85\u88ab\u4f9d\u8d56\u7684\u4efb\u52a1\u5b8c\u6210\u540e\uff0c\u4f9d\u8d56\u7684\u4efb\u52a1\u624d\u80fd\u7b97\u5b8c\u6210\uff0c\u8fd9\u662f\u4e00\u79cd\u53ef\u9760\u7684\u4efb\u52a1\u5e8f\u5217<\/code>\u3002\u8981\u4e48\u6210\u529f\u90fd\u6210\u529f\uff0c\u5931\u8d25\u90fd\u5931\u8d25\uff0c\u4e24\u4e2a\u4efb\u52a1\u7684\u72b6\u6001\u53ef\u4ee5\u4fdd\u6301\u4e00\u81f4\u3002<\/p>\n\n\n\n<p><code>\u6240\u8c13\u5f02\u6b65\u662f\u4e0d\u9700\u8981\u7b49\u5f85\u88ab\u4f9d\u8d56\u7684\u4efb\u52a1\u5b8c\u6210\uff0c\u53ea\u662f\u901a\u77e5\u88ab\u4f9d\u8d56\u7684\u4efb\u52a1\u8981\u5b8c\u6210\u4ec0\u4e48\u5de5\u4f5c\uff0c\u4f9d\u8d56\u7684\u4efb\u52a1\u4e5f\u7acb\u5373\u6267\u884c\uff0c\u53ea\u8981\u81ea\u5df1\u5b8c\u6210\u4e86\u6574\u4e2a\u4efb\u52a1\u5c31\u7b97\u5b8c\u6210\u4e86<\/code>\u3002\u81f3\u4e8e\u88ab\u4f9d\u8d56\u7684\u4efb\u52a1\u6700\u7ec8\u662f\u5426\u771f\u6b63\u5b8c\u6210\uff0c\u4f9d\u8d56\u5b83\u7684\u4efb\u52a1\u65e0\u6cd5\u786e\u5b9a\uff0c<code>\u6240\u4ee5\u5b83\u662f\u4e0d\u53ef\u9760\u7684\u4efb\u52a1\u5e8f\u5217<\/code>\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>1.2 \u6d88\u606f\u901a\u77e5<\/p><\/blockquote>\n\n\n\n<p><code>\u5f02\u6b65\u7684\u6982\u5ff5\u548c\u540c\u6b65\u76f8\u5bf9<\/code>\u3002\u5f53\u4e00\u4e2a\u540c\u6b65\u8c03\u7528\u53d1\u51fa\u540e\uff0c<code>\u8c03\u7528\u8005\u8981\u4e00\u76f4\u7b49\u5f85\u8fd4\u56de\u6d88\u606f\uff08\u7ed3\u679c\uff09\u901a\u77e5\u540e<\/code>\uff0c\u624d\u80fd\u8fdb\u884c\u540e\u7eed\u7684\u6267\u884c\uff1b\u5f53\u4e00\u4e2a\u5f02\u6b65\u8fc7\u7a0b\u8c03\u7528\u53d1\u51fa\u540e\uff0c\u8c03\u7528\u8005\u4e0d\u80fd\u7acb\u523b\u5f97\u5230\u8fd4\u56de\u6d88\u606f\uff08\u7ed3\u679c\uff09\u3002<code>\u5b9e\u9645\u5904\u7406\u8fd9\u4e2a\u8c03\u7528\u7684\u90e8\u4ef6\u5728\u5b8c\u6210\u540e\uff0c\u901a\u8fc7\u72b6\u6001\u3001\u901a\u77e5\u548c\u56de\u8c03\u6765\u901a\u77e5\u8c03\u7528\u8005<\/code>\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u63d0\u5230\u6267\u884c\u90e8\u4ef6\u548c\u8c03\u7528\u8005\u901a\u8fc7\u4e09\u79cd\u9014\u5f84\u8fd4\u56de\u7ed3\u679c\uff1a<code>\u72b6\u6001\u3001\u901a\u77e5\u548c\u56de\u8c03<\/code>\u3002\u4f7f\u7528\u54ea\u4e00\u79cd\u901a\u77e5\u673a\u5236\uff0c<code>\u4f9d\u8d56\u4e8e\u6267\u884c\u90e8\u4ef6\u7684\u5b9e\u73b0<\/code>\uff0c\u9664\u975e\u6267\u884c\u90e8\u4ef6\u63d0\u4f9b\u591a\u79cd\u9009\u62e9\uff0c<code>\u5426\u5219\u4e0d\u53d7\u8c03\u7528\u8005\u63a7\u5236<\/code>\u3002<\/p>\n\n\n\n<p>1\u3001\u5982\u679c\u6267\u884c\u90e8\u4ef6\u7528\u72b6\u6001\u6765\u901a\u77e5\uff0c\u90a3\u4e48\u8c03\u7528\u8005\u5c31\u9700\u8981\u6bcf\u9694\u4e00\u5b9a\u65f6\u95f4\u68c0\u67e5\u4e00\u6b21\uff0c\u6548\u7387\u5c31\u5f88\u4f4e\uff08\u6709\u4e9b\u521d\u5b66\u591a\u7ebf\u7a0b\u7f16\u7a0b\u7684\u4eba\uff0c\u603b\u559c\u6b22\u7528\u4e00\u4e2a\u5faa\u73af\u53bb\u68c0\u67e5\u67d0\u4e2a\u53d8\u91cf\u7684\u503c\uff0c\u8fd9\u5176\u5b9e\u662f\u4e00\u79cd\u5f88\u4e25\u91cd\u7684\u9519\u8bef\uff09\uff1b<\/p>\n\n\n\n<p>2\u3001\u5982\u679c\u662f\u4f7f\u7528\u901a\u77e5\u7684\u65b9\u5f0f\uff0c\u6548\u7387\u5219\u5f88\u9ad8\uff0c\u56e0\u4e3a\u6267\u884c\u90e8\u4ef6\u51e0\u4e4e\u4e0d\u9700\u8981\u505a\u989d\u5916\u7684\u64cd\u4f5c\u3002\u81f3\u4e8e\u56de\u8c03\u51fd\u6570\uff0c\u5176\u5b9e\u548c\u901a\u77e5\u6ca1\u592a\u591a\u533a\u522b\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>1.2 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(\u5728\u8fd9\u91cc\u662f\u67dc\u53f0\u7684\u4eba) \u901a\u8fc7\u67d0\u79cd\u673a\u5236 (\u5728\u8fd9\u91cc\u662f\u5199\u5728\u5c0f\u7eb8\u6761\u4e0a\u7684\u53f7\u7801\uff0c\u558a\u53f7) \u627e\u5230\u7b49\u5f85\u8be5\u4e8b\u4ef6\u7684\u4eba\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>2 \u963b\u585e\u4e0e\u975e\u963b\u585e<\/p><\/blockquote>\n\n\n\n<p><strong><code>\u963b\u585e\u548c\u975e\u963b\u585e\u8fd9\u4e24\u4e2a\u6982\u5ff5\u4e0e\u7a0b\u5e8f\uff08\u7ebf\u7a0b\uff09\u7b49\u5f85\u6d88\u606f\u901a\u77e5(\u65e0\u6240\u8c13\u540c\u6b65\u6216\u8005\u5f02\u6b65)\u65f6\u7684\u72b6\u6001\u6709\u5173\u3002\u4e5f\u5c31\u662f\u8bf4\u963b\u585e\u4e0e\u975e\u963b\u585e\u4e3b\u8981\u662f\u7a0b\u5e8f\uff08\u7ebf\u7a0b\uff09\u7b49\u5f85\u6d88\u606f\u901a\u77e5\u65f6\u7684\u72b6\u6001\u89d2\u5ea6\u6765\u8bf4\u7684\u3002<\/code><\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>2.1 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class=\"wp-block-code\"><code>(a) \u5982\u679c\u8fd9\u4e2a\u7ebf\u7a0b\u5728\u7b49\u5f85\u5f53\u524d\u51fd\u6570\u8fd4\u56de\u65f6\uff0c\u4ecd\u5728\u6267\u884c\u5176\u4ed6\u6d88\u606f\u5904\u7406\uff0c\u90a3\u8fd9\u79cd\u60c5\u51b5\u5c31\u53eb\u505a\u540c\u6b65\u975e\u963b\u585e\uff1b\n(b) \u5982\u679c\u8fd9\u4e2a\u7ebf\u7a0b\u5728\u7b49\u5f85\u5f53\u524d\u51fd\u6570\u8fd4\u56de\u65f6\uff0c\u6ca1\u6709\u6267\u884c\u5176\u4ed6\u6d88\u606f\u5904\u7406\uff0c\u800c\u662f\u5904\u4e8e\u6302\u8d77\u7b49\u5f85\u72b6\u6001\uff0c\u90a3\u8fd9\u79cd\u60c5\u51b5\u5c31\u53eb\u505a\u540c\u6b65\u963b\u585e\uff1b<\/code><\/pre>\n\n\n\n<p><strong><code>\u6240\u4ee5\u540c\u6b65\u7684\u5b9e\u73b0\u65b9\u5f0f\u4f1a\u6709\u4e24\u79cd\uff1a\u540c\u6b65\u963b\u585e\u3001\u540c\u6b65\u975e\u963b\u585e\uff1b\u540c\u7406\uff0c\u5f02\u6b65\u4e5f\u4f1a\u6709\u4e24\u79cd\u5b9e\u73b0\uff1a\u5f02\u6b65\u963b\u585e\u3001\u5f02\u6b65\u975e\u963b\u585e\uff1b<\/code><\/strong><\/p>\n\n\n\n<p>2\u3001\u5bf9\u4e8e\u963b\u585e\u8c03\u7528\u6765\u8bf4\uff0c\u5219\u5f53\u524d\u7ebf\u7a0b\u5c31\u4f1a\u88ab\u6302\u8d77\u7b49\u5f85\u5f53\u524d\u51fd\u6570\u8fd4\u56de\uff1b<\/p>\n\n\n\n<p>\u975e\u963b\u585e\u548c\u963b\u585e\u7684\u6982\u5ff5\u76f8\u5bf9\u5e94\uff0c<code>\u6307\u5728\u4e0d\u80fd\u7acb\u523b\u5f97\u5230\u7ed3\u679c\u4e4b\u524d\uff0c\u8be5\u51fd\u6570\u4e0d\u4f1a\u963b\u585e\u5f53\u524d\u7ebf\u7a0b\uff0c\u800c\u4f1a\u7acb\u523b\u8fd4\u56de<\/code>\u3002\u867d\u7136\u8868\u9762\u4e0a\u770b\u975e\u963b\u585e\u7684\u65b9\u5f0f\u53ef\u4ee5\u660e\u663e\u7684\u63d0\u9ad8 CPU \u7684\u5229\u7528\u7387\uff0c<code>\u4f46\u662f\u4e5f\u5e26\u4e86\u53e6\u5916\u4e00\u79cd\u540e\u679c\u5c31\u662f\u7cfb\u7edf\u7684\u7ebf\u7a0b\u5207\u6362\u589e\u52a0<\/code>\u3002<code>\u589e\u52a0\u7684CPU\u6267\u884c\u65f6\u95f4\u80fd\u4e0d\u80fd\u8865\u507f\u7cfb\u7edf\u7684\u5207\u6362\u6210\u672c\u9700\u8981\u597d\u597d\u8bc4\u4f30<\/code>\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>2.2 \u573a\u666f\u6bd4\u55bb<\/p><\/blockquote>\n\n\n\n<p>\u7ee7\u7eed\u4e0a\u9762\u7684\u90a3\u4e2a\u4f8b\u5b50\uff0c\u4e0d\u8bba\u662f\u6392\u961f\u8fd8\u662f\u4f7f\u7528\u53f7\u7801\u7b49\u5f85\u901a\u77e5\uff0c<code>\u5982\u679c\u5728\u8fd9\u4e2a\u7b49\u5f85\u7684\u8fc7\u7a0b\u4e2d\uff0c\u7b49\u5f85\u8005\u9664\u4e86\u7b49\u5f85\u6d88\u606f\u901a\u77e5\u4e4b\u5916\u4e0d\u80fd\u505a\u5176\u5b83\u7684\u4e8b\u60c5\uff0c\u90a3\u4e48\u8be5\u673a\u5236\u5c31\u662f\u963b\u585e\u7684<\/code>\uff0c\u8868\u73b0\u5728\u7a0b\u5e8f\u4e2d\uff0c\u4e5f\u5c31\u662f\u8be5\u7a0b\u5e8f\u4e00\u76f4\u963b\u585e\u5728\u8be5\u51fd\u6570\u8c03\u7528\u5904\u4e0d\u80fd\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c\u3002<\/p>\n\n\n\n<p>\u76f8\u53cd\uff0c<code>\u6709\u7684\u4eba\u559c\u6b22\u5728\u94f6\u884c\u529e\u7406\u8fd9\u4e9b\u4e1a\u52a1\u7684\u65f6\u5019\u4e00\u8fb9\u6253\u6253\u7535\u8bdd\u53d1\u53d1\u77ed\u4fe1\u4e00\u8fb9\u7b49\u5f85\uff0c\u8fd9\u6837\u7684\u72b6\u6001\u5c31\u662f\u975e\u963b\u585e\u7684<\/code>\uff0c\u56e0\u4e3a\u4ed6 (\u7b49\u5f85\u8005) \u6ca1\u6709\u963b\u585e\u5728\u8fd9\u4e2a\u6d88\u606f\u901a\u77e5\u4e0a\uff0c\u800c\u662f\u4e00\u8fb9\u505a\u81ea\u5df1\u7684\u4e8b\u60c5\u4e00\u8fb9\u7b49\u5f85\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u9700\u8981\u6ce8\u610f\u4e86\uff0c<code>\u540c\u6b65\u975e\u963b\u585e\u5f62\u5f0f\u5b9e\u9645\u4e0a\u662f\u6548\u7387\u4f4e\u4e0b\u7684<\/code>\uff0c\u60f3\u8c61\u4e00\u4e0b\u4f60\u4e00\u8fb9\u6253\u7740\u7535\u8bdd\u4e00\u8fb9\u8fd8\u9700\u8981\u62ac\u5934\u770b\u5230\u5e95\u961f\u4f0d\u6392\u5230\u4f60\u4e86\u6ca1\u6709\u3002\u5982\u679c\u628a\u6253\u7535\u8bdd\u548c\u89c2\u5bdf\u6392\u961f\u7684\u4f4d\u7f6e\u770b\u6210\u662f\u7a0b\u5e8f\u7684\u4e24\u4e2a\u64cd\u4f5c\u7684\u8bdd\uff0c\u8fd9\u4e2a\u7a0b\u5e8f\u9700\u8981\u5728\u8fd9\u4e24\u79cd\u4e0d\u540c\u7684\u884c\u4e3a\u4e4b\u95f4\u6765\u56de\u7684\u5207\u6362\uff0c\u6548\u7387\u53ef\u60f3\u800c\u77e5\u662f\u4f4e\u4e0b\u7684\uff1b\u800c<code>\u5f02\u6b65\u975e\u963b\u585e\u5f62\u5f0f\u5374\u6ca1\u6709\u8fd9\u6837\u7684\u95ee\u9898<\/code>\uff0c\u56e0\u4e3a\u6253\u7535\u8bdd\u662f\u4f60 (\u7b49\u5f85\u8005) \u7684\u4e8b\u60c5\uff0c\u800c\u901a\u77e5\u4f60\u5219\u662f\u67dc\u53f0 (\u6d88\u606f\u89e6\u53d1\u673a\u5236) \u7684\u4e8b\u60c5\uff0c\u7a0b\u5e8f\u6ca1\u6709\u5728\u4e24\u79cd\u4e0d\u540c\u7684\u64cd\u4f5c\u4e2d\u6765\u56de\u5207\u6362\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h1>3 \u540c\u6b65 \/ \u5f02\u6b65\u4e0e\u963b\u585e \/ \u975e\u963b\u585e<\/h1>\n\n\n\n<p><strong>1\u3001\u540c\u6b65\u963b\u585e\u5f62\u5f0f<\/strong><\/p>\n\n\n\n<p>\u6548\u7387\u662f\u6700\u4f4e\u7684\uff0c<\/p>\n\n\n\n<p>\u62ff\u4e0a\u9762\u7684\u4f8b\u5b50\u6765\u8bf4\uff0c\u5c31\u662f\u4f60\u4e13\u5fc3\u6392\u961f\uff0c\u4ec0\u4e48\u522b\u7684\u4e8b\u90fd\u4e0d\u505a\u3002<\/p>\n\n\n\n<p><strong>\u5b9e\u9645\u7a0b\u5e8f\u4e2d\uff1a<\/strong>\u5c31\u662f\u672a\u5bf9 fd \u8bbe\u7f6e O_NONBLOCK \u6807\u5fd7\u4f4d\u7684 read\/write \u64cd\u4f5c\uff1b<\/p>\n\n\n\n<p><strong>2\u3001\u5f02\u6b65\u963b\u585e\u5f62\u5f0f<\/strong><\/p>\n\n\n\n<p>\u5982\u679c\u5728\u94f6\u884c\u7b49\u5f85\u529e\u7406\u4e1a\u52a1\u7684\u4eba<code>\u91c7\u7528\u7684\u662f\u5f02\u6b65\u7684\u65b9\u5f0f\u53bb\u7b49\u5f85\u6d88\u606f\u88ab\u89e6\u53d1\uff08\u901a\u77e5\uff09<\/code>\uff0c\u4e5f\u5c31\u662f\u9886\u4e86\u4e00\u5f20\u5c0f\u7eb8\u6761\uff0c\u5047\u5982\u5728\u8fd9\u6bb5\u65f6\u95f4\u91cc\u4ed6\u4e0d\u80fd\u79bb\u5f00\u94f6\u884c\u505a\u5176\u5b83\u7684\u4e8b\u60c5\uff0c\u90a3\u4e48\u5f88\u663e\u7136\uff0c\u8fd9\u4e2a\u4eba\u88ab\u963b\u585e\u5728\u4e86\u8fd9\u4e2a\u7b49\u5f85\u7684\u64cd\u4f5c\u4e0a\u9762\uff1b<\/p>\n\n\n\n<p><strong><code>\u5f02\u6b65\u64cd\u4f5c\u662f\u53ef\u4ee5\u88ab\u963b\u585e\u4f4f\u7684\uff0c\u53ea\u4e0d\u8fc7\u5b83\u4e0d\u662f\u5728\u5904\u7406\u6d88\u606f\u65f6\u963b\u585e\uff0c\u800c\u662f\u5728\u7b49\u5f85\u6d88\u606f\u901a\u77e5\u65f6\u88ab\u963b\u585e\u3002<\/code><\/strong><\/p>\n\n\n\n<p>\u6bd4\u5982 select \u51fd\u6570\uff0c\u5047\u5982\u4f20\u5165\u7684\u6700\u540e\u4e00\u4e2a timeout \u53c2\u6570\u4e3a NULL\uff0c<code>\u90a3\u4e48\u5982\u679c\u6240\u5173\u6ce8\u7684\u4e8b\u4ef6\u6ca1\u6709\u4e00\u4e2a\u88ab\u89e6\u53d1\uff0c\u7a0b\u5e8f\u5c31\u4f1a\u4e00\u76f4\u963b\u585e\u5728\u8fd9\u4e2aselect \u8c03\u7528\u5904<\/code>\u3002<\/p>\n\n\n\n<p><strong>3\u3001\u540c\u6b65\u975e\u963b\u585e\u5f62\u5f0f<\/strong><\/p>\n\n\n\n<p>\u5b9e\u9645\u4e0a\u662f\u6548\u7387\u4f4e\u4e0b\u7684\uff0c<\/p>\n\n\n\n<p>\u60f3\u8c61\u4e00\u4e0b\u4f60\u4e00\u8fb9\u6253\u7740\u7535\u8bdd\u4e00\u8fb9\u8fd8\u9700\u8981\u62ac\u5934\u770b\u5230\u5e95\u961f\u4f0d\u6392\u5230\u4f60\u4e86\u6ca1\u6709\uff0c\u5982\u679c\u628a\u6253\u7535\u8bdd\u548c\u89c2\u5bdf\u6392\u961f\u7684\u4f4d\u7f6e\u770b\u6210\u662f\u7a0b\u5e8f\u7684\u4e24\u4e2a\u64cd\u4f5c\u7684\u8bdd\uff0c<code>\u8fd9\u4e2a\u7a0b\u5e8f\u9700\u8981\u5728\u8fd9\u4e24\u79cd\u4e0d\u540c\u7684\u884c\u4e3a\u4e4b\u95f4\u6765\u56de\u7684\u5207\u6362<\/code>\uff0c\u6548\u7387\u53ef\u60f3\u800c\u77e5\u662f\u4f4e\u4e0b\u7684\u3002<\/p>\n\n\n\n<p>\u5f88\u591a\u4eba\u4f1a\u5199\u963b\u585e\u7684 read\/write \u64cd\u4f5c\uff0c<code>\u4f46\u662f\u522b\u5fd8\u4e86\u53ef\u4ee5\u5bf9fd\u8bbe\u7f6eO_NONBLOCK \u6807\u5fd7\u4f4d\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u5c06\u540c\u6b65\u64cd\u4f5c\u53d8\u6210\u975e\u963b\u585e\u7684\u4e86<\/code>\u3002<\/p>\n\n\n\n<p><strong>4\u3001\u5f02\u6b65\u975e\u963b\u585e\u5f62\u5f0f<\/strong><\/p>\n\n\n\n<p>\u6548\u7387\u66f4\u9ad8\uff0c<\/p>\n\n\n\n<p>\u56e0\u4e3a\u6253\u7535\u8bdd\u662f\u4f60 (\u7b49\u5f85\u8005) \u7684\u4e8b\u60c5\uff0c\u800c\u901a\u77e5\u4f60\u5219\u662f\u67dc\u53f0 (\u6d88\u606f\u89e6\u53d1\u673a\u5236) \u7684\u4e8b\u60c5\uff0c<code>\u7a0b\u5e8f\u6ca1\u6709\u5728\u4e24\u79cd\u4e0d\u540c\u7684\u64cd\u4f5c\u4e2d\u6765\u56de\u5207\u6362<\/code>\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\u8bf4\uff0c\u8fd9\u4e2a\u4eba\u7a81\u7136\u53d1\u89c9\u81ea\u5df1\u70df\u763e\u72af\u4e86\uff0c\u9700\u8981\u51fa\u53bb\u62bd\u6839\u70df\uff0c\u4e8e\u662f\u4ed6\u544a\u8bc9\u5927\u5802\u7ecf\u7406\u8bf4\uff0c\u6392\u5230\u6211\u8fd9\u4e2a\u53f7\u7801\u7684\u65f6\u5019\u9ebb\u70e6\u5230\u5916\u9762\u901a\u77e5\u6211\u4e00\u4e0b (\u6ce8\u518c\u4e00\u4e2a\u56de\u8c03\u51fd\u6570)\uff0c\u90a3\u4e48\u4ed6\u5c31\u6ca1\u6709\u88ab\u963b\u585e\u5728\u8fd9\u4e2a\u7b49\u5f85\u7684\u64cd\u4f5c\u4e0a\u9762\uff0c\u81ea\u7136\u8fd9\u4e2a\u5c31\u662f\u5f02\u6b65 + \u975e\u963b\u585e\u7684\u65b9\u5f0f\u4e86\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u4f7f\u7528\u5f02\u6b65\u975e\u963b\u585e\u7684\u60c5\u51b5\uff0c\u6bd4\u5982 aio_* \u7ec4\u7684\u64cd\u4f5c\uff0c\u5f53\u53d1\u8d77\u4e00\u4e2a aio_read \u64cd\u4f5c\u65f6\uff0c<code>\u51fd\u6570\u4f1a\u9a6c\u4e0a\u8fd4\u56de\u4e0d\u4f1a\u88ab\u963b\u585e\uff0c\u5f53\u6240\u5173\u6ce8\u7684\u4e8b\u4ef6\u88ab\u89e6\u53d1\u65f6\u4f1a\u8c03\u7528\u4e4b\u524d\u6ce8\u518c\u7684\u56de\u8c03\u51fd\u6570\u8fdb\u884c\u5904\u7406<\/code>\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u5f88\u591a\u4eba\u4f1a\u628a\u540c\u6b65\u548c\u963b\u585e\u6df7\u6dc6\uff0c\u6211\u60f3\u662f<code>\u56e0\u4e3a\u5f88\u591a\u65f6\u5019\u540c\u6b65\u64cd\u4f5c\u4f1a\u4ee5\u963b\u585e\u7684\u5f62\u5f0f\u8868\u73b0\u51fa\u6765<\/code>\uff0c\u6bd4\u5982\u5f88\u591a\u4eba\u4f1a\u5199\u963b\u585e\u7684 read\/write \u64cd\u4f5c\uff0c\u4f46\u662f\u522b\u5fd8\u4e86\u53ef\u4ee5\u5bf9 fd \u8bbe\u7f6e O_NONBLOCK \u6807\u5fd7\u4f4d\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u5c06\u540c\u6b65\u64cd\u4f5c\u53d8\u6210\u975e\u963b\u585e\u7684\u4e86\u3002<code>\u4f46\u6700\u6839\u672c\u662f\u56e0\u4e3a\u6ca1\u6709\u533a\u5206\u8fd9\u4e24\u4e2a\u6982\u5ff5<\/code>\uff0c\u6bd4\u5982\u963b\u585e\u7684 read\/write \u64cd\u4f5c\u4e2d\uff0c<code>\u5176\u5b9e\u662f\u628a\u6d88\u606f\u901a\u77e5\u673a\u5236\u548c\u7b49\u5f85\u6d88\u606f\u901a\u77e5\u7684\u72b6\u6001\u7ed3\u5408\u5728\u4e86\u4e00\u8d77<\/code>\uff0c\u5728\u8fd9\u91cc<code>\u6240\u5173\u6ce8\u7684\u6d88\u606f\u5c31\u662ffd\u662f\u5426\u53ef\u8bfb\/\u5199<\/code>\uff0c\u800c<code>\u7b49\u5f85\u6d88\u606f\u901a\u77e5\u7684\u72b6\u6001\u5219\u662f\u5bf9fd\u53ef\u8bfb\/\u5199\u7b49\u5f85\u8fc7\u7a0b\u4e2d\u7a0b\u5e8f\uff08\u7ebf\u7a0b\uff09\u7684\u72b6\u6001<\/code>\u3002\u5f53\u6211\u4eec\u5c06\u8fd9\u4e2a fd \u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\u7684\u65f6\u5019\uff0cread\/write \u64cd\u4f5c\u5c31\u4e0d\u4f1a\u5728\u7b49\u5f85\u6d88\u606f\u901a\u77e5\u8fd9\u91cc\u963b\u585e\uff0c\u5982\u679c fd \u4e0d\u53ef\u8bfb \/ \u5199\u5219\u64cd\u4f5c\u7acb\u5373\u8fd4\u56de\u3002<\/p>\n\n\n\n<p>\u540c\u6837\u7684\uff0c\u5f88\u591a\u4eba\u4e5f\u4f1a\u628a\u5f02\u6b65\u548c\u975e\u963b\u585e\u6df7\u6dc6\uff0c<code>\u56e0\u4e3a\u5f02\u6b65\u64cd\u4f5c\u4e00\u822c\u90fd\u4e0d\u4f1a\u5728\u771f\u6b63\u7684IO\u64cd\u4f5c\u5904\u88ab\u963b\u585e<\/code>\uff0c\u6bd4\u5982\u5982\u679c\u7528 select \u51fd\u6570\uff0c<code>\u5f53select\u8fd4\u56de\u53ef\u8bfb\u65f6\u518d\u53bbread\u4e00\u822c\u90fd\u4e0d\u4f1a\u88ab\u963b\u585e\uff0c\u800c\u662f\u5728select\u51fd\u6570\u8c03\u7528\u5904\u963b\u585e<\/code>\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2>4 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