{"id":79418,"date":"2026-03-02T07:25:47","date_gmt":"2026-03-01T23:25:47","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/79418.html"},"modified":"2026-03-02T07:25:47","modified_gmt":"2026-03-01T23:25:47","slug":"linux%e9%ab%98%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%ae%9e%e7%8e%b0%e5%8e%9f%e7%90%86%ef%bc%9a%e4%bb%8e%e5%a4%9a%e8%bf%9b%e7%a8%8b%e5%88%b0%e5%a4%9a%e8%b7%afio%e8%bd%ac%e6%8e%a5%e7%9a%84","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/79418.html","title":{"rendered":"Linux\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u5b9e\u73b0\u539f\u7406\uff1a\u4ece\u591a\u8fdb\u7a0b\u5230\u591a\u8defIO\u8f6c\u63a5\u7684\u6f14\u8fdb\u4e4b\u8def"},"content":{"rendered":"<h2>&#x1f31f; Linux\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u5b9e\u73b0\u539f\u7406&#xff1a;\u4ece\u591a\u8fdb\u7a0b\u5230\u591a\u8defIO\u8f6c\u63a5\u7684\u6f14\u8fdb\u4e4b\u8def<\/h2>\n<h2>&#x1f680; \u5f15\u8a00&#xff1a;\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u6311\u6218<\/h2>\n<p>\u5728\u4e92\u8054\u7f51\u5e94\u7528\u7206\u70b8\u5f0f\u589e\u957f\u7684\u4eca\u5929&#xff0c;\u670d\u52a1\u5668\u9700\u8981\u540c\u65f6\u5904\u7406\u6210\u5343\u4e0a\u4e07\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\u5df2\u6210\u4e3a\u5e38\u6001\u3002\u60f3\u8c61\u4e00\u4e0b&#xff0c;\u4e00\u4e2a\u7535\u5546\u5e73\u53f0\u5728&#034;\u53cc\u5341\u4e00&#034;\u671f\u95f4&#xff0c;\u6bcf\u79d2\u9700\u8981\u5904\u7406\u6570\u5341\u4e07\u751a\u81f3\u4e0a\u767e\u4e07\u7684\u8bf7\u6c42\u2014\u2014\u8fd9\u5c31\u662f\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u7528\u6b66\u4e4b\u5730\u3002\u672c\u6587\u5c06\u5e26\u60a8\u6df1\u5165\u63a2\u7d22Linux\u73af\u5883\u4e0b\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u5b9e\u73b0\u539f\u7406&#xff0c;\u4ece\u4f20\u7edf\u7684\u591a\u8fdb\u7a0b\/\u591a\u7ebf\u7a0b\u6a21\u578b&#xff0c;\u5230\u73b0\u4ee3\u7684\u591a\u8defIO\u8f6c\u63a5\u673a\u5236\u3002<\/p>\n<h2>&#x1f9e9; \u4f20\u7edf\u5b9e\u73b0\u65b9\u5f0f\u56de\u987e<\/h2>\n<h3>1. \u591a\u8fdb\u7a0b\u6a21\u578b&#xff1a;\u5206\u800c\u6cbb\u4e4b\u7684\u53e4\u8001\u667a\u6167<\/h3>\n<p>\u5728\u591a\u8fdb\u7a0b\u6a21\u578b\u4e2d&#xff0c;\u6bcf\u5f53\u6709\u65b0\u5ba2\u6237\u7aef\u8fde\u63a5\u65f6&#xff0c;\u670d\u52a1\u5668\u4f1afork\u51fa\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u4e13\u95e8\u5904\u7406\u8be5\u8fde\u63a5\u3002\u8fd9\u79cd&#034;\u4e00\u4e2a\u5ba2\u6237\u7aef\u4e00\u4e2a\u8fdb\u7a0b&#034;\u7684\u65b9\u5f0f\u7b80\u5355\u76f4\u89c2&#xff0c;\u5c31\u50cf\u4e3a\u6bcf\u4f4d\u987e\u5ba2\u914d\u5907\u4e13\u5c5e\u670d\u52a1\u5458\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u4f2a\u4ee3\u7801\u793a\u4f8b&#xff1a;\u591a\u8fdb\u7a0b\u6a21\u578b<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> lfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57<\/span><br \/>\n    <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u7ed1\u5b9a\u7aef\u53e3<\/span><br \/>\n    <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u5f00\u59cb\u76d1\u542c<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u63a5\u53d7\u65b0\u8fde\u63a5<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>      <span class=\"token comment\">\/\/ \u521b\u5efa\u5b50\u8fdb\u7a0b<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u5b50\u8fdb\u7a0b\u4e0d\u9700\u8981\u76d1\u542c<\/span><br \/>\n            <span class=\"token function\">handle_client<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5904\u7406\u5ba2\u6237\u7aef\u8bf7\u6c42<\/span><br \/>\n            <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>           <span class=\"token comment\">\/\/ \u5904\u7406\u5b8c\u6210\u540e\u9000\u51fa<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7236\u8fdb\u7a0b\u4e0d\u9700\u8981\u901a\u4fe1\u5957\u63a5\u5b57<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u9694\u79bb\u6027\u597d&#xff0c;\u4e00\u4e2a\u8fdb\u7a0b\u5d29\u6e83\u4e0d\u4f1a\u5f71\u54cd\u5176\u4ed6\u8fde\u63a5<\/li>\n<li>\u7f16\u7a0b\u6a21\u578b\u7b80\u5355\u76f4\u63a5<\/li>\n<\/ul>\n<p>\u7f3a\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u8fdb\u7a0b\u521b\u5efa\/\u9500\u6bc1\u5f00\u9500\u5927<\/li>\n<li>\u8fdb\u7a0b\u95f4\u4e0a\u4e0b\u6587\u5207\u6362\u6210\u672c\u9ad8<\/li>\n<li>\u8fdb\u7a0b\u6570\u91cf\u53d7\u7cfb\u7edf\u9650\u5236<\/li>\n<\/ul>\n<h3>2. 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\/>\n    <span class=\"token keyword\">int<\/span> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>arg<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5904\u7406\u5ba2\u6237\u7aef\u8bf7\u6c42<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> lfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">pthread_t<\/span> tid<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> client_handler<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>cfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">pthread_detach<\/span><span class=\"token punctuation\">(<\/span>tid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5206\u79bb\u7ebf\u7a0b&#xff0c;\u907f\u514d\u9700\u8981join<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u7ebf\u7a0b\u521b\u5efa\/\u9500\u6bc1\u6bd4\u8fdb\u7a0b\u8f7b\u91cf<\/li>\n<li>\u7ebf\u7a0b\u95f4\u5171\u4eab\u6570\u636e\u66f4\u65b9\u4fbf<\/li>\n<\/ul>\n<p>\u7f3a\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u7ebf\u7a0b\u6570\u91cf\u4ecd\u6709\u9650\u5236<\/li>\n<li>\u9700\u8981\u8003\u8651\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898<\/li>\n<li>\u4e0a\u4e0b\u6587\u5207\u6362\u5f00\u9500\u4ecd\u7136\u5b58\u5728<\/li>\n<\/ul>\n<h3>&#x1f4ca; \u591a\u8fdb\u7a0b vs \u591a\u7ebf\u7a0b\u6027\u80fd\u5bf9\u6bd4<\/h3>\n<p>#mermaid-svg-JCh52icwYcW2BB06{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes 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class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u5ba2\u6237\u7aef\u8fde\u63a5<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u5904\u7406\u65b9\u5f0f<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u591a\u8fdb\u7a0b<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u591a\u7ebf\u7a0b<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u9ad8\u8d44\u6e90\u6d88\u8017<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u5f3a\u9694\u79bb\u6027<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u8f83\u4f4e\u8d44\u6e90\u6d88\u8017<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u9700\u8981\u7ebf\u7a0b\u540c\u6b65<\/p>\n<p><\/span><\/p>\n<p>\u56fe\u8868\u8bf4\u660e&#xff1a;\u591a\u8fdb\u7a0b\u548c\u591a\u7ebf\u7a0b\u5404\u6709\u4f18\u7f3a\u70b9&#xff0c;\u9009\u62e9\u53d6\u51b3\u4e8e\u5177\u4f53\u5e94\u7528\u573a\u666f\u548c\u6027\u80fd\u9700\u6c42<\/p>\n<h2>&#x1f3af; \u4f20\u7edf\u6a21\u578b\u7684\u95ee\u9898\u6838\u5fc3<\/h2>\n<p>\u65e0\u8bba\u662f\u591a\u8fdb\u7a0b\u8fd8\u662f\u591a\u7ebf\u7a0b\u6a21\u578b&#xff0c;\u90fd\u5b58\u5728\u4e00\u4e2a\u6839\u672c\u6027\u95ee\u9898&#xff1a;\u963b\u585e\u5f0fIO\u3002\u5f53\u670d\u52a1\u5668\u8c03\u7528accept()\u3001read()\u7b49\u51fd\u6570\u65f6&#xff0c;\u5982\u679c\u6ca1\u6709\u6570\u636e\u5230\u8fbe&#xff0c;\u6574\u4e2a\u8fdb\u7a0b\/\u7ebf\u7a0b\u4f1a\u88ab\u963b\u585e&#xff0c;\u65e0\u6cd5\u5904\u7406\u5176\u4ed6\u8fde\u63a5\u3002\u8fd9\u5c31\u50cf\u9910\u5385\u7684\u670d\u52a1\u5458\u5728\u7b49\u5f85\u4e00\u4f4d\u987e\u5ba2\u70b9\u9910\u65f6&#xff0c;\u5b8c\u5168\u65e0\u89c6\u5176\u4ed6\u987e\u5ba2\u7684\u62db\u547c\u3002<\/p>\n<p>\u4e3b\u8981\u74f6\u9888&#xff1a;<\/p>\n<li>\u6bcf\u4e2a\u8fde\u63a5\u9700\u8981\u72ec\u7acb\u7684\u8fdb\u7a0b\/\u7ebf\u7a0b<\/li>\n<li>\u5927\u91cf\u65f6\u95f4\u6d6a\u8d39\u5728IO\u7b49\u5f85\u4e0a<\/li>\n<li>\u4e0a\u4e0b\u6587\u5207\u6362\u5f00\u9500\u968f\u8fde\u63a5\u6570\u7ebf\u6027\u589e\u957f<\/li>\n<h2>&#x1f4a1; \u7a81\u7834\u6027\u89e3\u51b3\u65b9\u6848&#xff1a;\u591a\u8defIO\u8f6c\u63a5\u673a\u5236<\/h2>\n<h3>1. \u6838\u5fc3\u601d\u60f3&#xff1a;\u4ece&#034;\u4e3b\u52a8\u8be2\u95ee&#034;\u5230&#034;\u88ab\u52a8\u901a\u77e5&#034;<\/h3>\n<p>\u591a\u8defIO\u8f6c\u63a5\u673a\u5236\u7684\u6838\u5fc3\u521b\u65b0\u5728\u4e8e&#xff1a;\u8ba9\u5185\u6838\u901a\u77e5\u6211\u4eec\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea&#xff0c;\u800c\u4e0d\u662f\u6211\u4eec\u4e3b\u52a8\u53bb\u8f6e\u8be2\u6bcf\u4e2a\u8fde\u63a5\u3002\u8fd9\u5c31\u50cf\u7ed9\u8001\u677f(\u670d\u52a1\u5668)\u914d\u4e86\u4e00\u4e2a\u80fd\u5e72\u7684\u79d8\u4e66(\u5185\u6838)&#xff0c;\u79d8\u4e66\u4f1a\u4e3b\u52a8\u6c47\u62a5\u54ea\u4e9b\u5ba2\u6237(\u8fde\u63a5)\u9700\u8981\u5904\u7406\u3002<\/p>\n<h3>2. \u673a\u5236\u7c7b\u6bd4&#xff1a;\u516c\u53f8\u7ba1\u7406\u7684\u8fdb\u5316<\/h3>\n<p>\u60f3\u8c61\u4e00\u5bb6\u521d\u521b\u516c\u53f8&#xff1a;<\/p>\n<ul>\n<li>\u521d\u671f(\u963b\u585e\u6a21\u578b) &#xff1a;\u8001\u677f\u4eb2\u81ea\u63a5\u5f85\u6bcf\u4e2a\u5ba2\u6237&#xff0c;\u671f\u95f4\u4e0d\u80fd\u505a\u5176\u4ed6\u4e8b<\/li>\n<li>\u53d1\u5c55\u671f(\u975e\u963b\u585e\u8f6e\u8be2) &#xff1a;\u8001\u677f\u4e0d\u65ad\u67e5\u770b\u662f\u5426\u6709\u5ba2\u6237\u6765\u8bbf&#xff0c;\u6548\u7387\u4f4e\u4e0b<\/li>\n<li>\u6210\u719f\u671f(\u591a\u8defIO\u8f6c\u63a5) &#xff1a;\u96c7\u4f63\u79d8\u4e66\u5904\u7406\u65e5\u5e38\u4e8b\u52a1&#xff0c;\u53ea\u6709\u91cd\u8981\u4e8b\u9879\u624d\u6c47\u62a5\u7ed9\u8001\u677f<\/li>\n<\/ul>\n<h3>3. select\u673a\u5236&#xff1a;\u7b2c\u4e00\u4ee3\u591a\u8defIO\u8f6c\u63a5<\/h3>\n<p>select\u662fUnix\/Linux\u6700\u65e9\u63d0\u4f9b\u7684\u591a\u8defIO\u8f6c\u63a5\u63a5\u53e3&#xff0c;\u867d\u7136\u6548\u7387\u4e0d\u662f\u6700\u9ad8&#xff0c;\u4f46\u517c\u5bb9\u6027\u6781\u4f73\u3002<\/p>\n<p><span class=\"token comment\">\/\/ select\u4f7f\u7528\u793a\u4f8b<\/span><br \/>\nfd_set readfds<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">FD_ZERO<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>readfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">FD_SET<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>readfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u76d1\u542c\u5957\u63a5\u5b57<\/span><br \/>\n<span class=\"token keyword\">int<\/span> maxfd <span class=\"token operator\">&#061;<\/span> lfd<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    fd_set tmpfds <span class=\"token operator\">&#061;<\/span> readfds<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">select<\/span><span class=\"token punctuation\">(<\/span>maxfd<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>tmpfds<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">FD_ISSET<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>tmpfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6709\u65b0\u8fde\u63a5<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">FD_SET<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>readfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        maxfd <span class=\"token operator\">&#061;<\/span> cfd <span class=\"token operator\">&gt;<\/span> maxfd <span class=\"token operator\">?<\/span> cfd <span class=\"token operator\">:<\/span> maxfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd <span class=\"token operator\">&#061;<\/span> lfd<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> fd <span class=\"token operator\">&lt;&#061;<\/span> maxfd<span class=\"token punctuation\">;<\/span> fd<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">FD_ISSET<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>tmpfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5904\u7406\u5ba2\u6237\u7aef\u6570\u636e<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">FD_CLR<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>readfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u5904\u7406\u4e1a\u52a1\u903b\u8f91<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>select\u5de5\u4f5c\u6d41\u7a0b&#xff1a;<\/p>\n<li>\u521d\u59cb\u5316\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<\/li>\n<li>\u8c03\u7528select\u8fdb\u5165\u963b\u585e&#xff0c;\u7b49\u5f85\u4efb\u4e00\u63cf\u8ff0\u7b26\u5c31\u7eea<\/li>\n<li>select\u8fd4\u56de\u540e&#xff0c;\u904d\u5386\u6240\u6709\u63cf\u8ff0\u7b26\u68c0\u67e5\u54ea\u4e9b\u5c31\u7eea<\/li>\n<li>\u5904\u7406\u5c31\u7eea\u7684\u63cf\u8ff0\u7b26(\u63a5\u53d7\u8fde\u63a5\u6216\u8bfb\u5199\u6570\u636e)<\/li>\n<p>select\u7684\u5c40\u9650\u6027&#xff1a;<\/p>\n<ul>\n<li>\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u6709\u9650(FD_SETSIZE\u901a\u5e38\u4e3a1024)<\/li>\n<li>\u9700\u8981\u6bcf\u6b21\u8c03\u7528\u90fd\u4f20\u9012\u6574\u4e2a\u63cf\u8ff0\u7b26\u96c6\u5408<\/li>\n<li>\u9700\u8981\u7ebf\u6027\u626b\u63cf\u6240\u6709\u63cf\u8ff0\u7b26\u627e\u51fa\u5c31\u7eea\u7684<\/li>\n<li>\u4e0d\u652f\u6301\u63cf\u8ff0\u7b26\u72b6\u6001\u53d8\u5316\u7684\u4e8b\u4ef6\u901a\u77e5<\/li>\n<\/ul>\n<h3>&#x1f4c8; select\u6027\u80fd\u7279\u70b9<\/h3>\n<table>\n<tr>\u7279\u6027\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>\u65f6\u95f4\u590d\u6742\u5ea6<\/td>\n<td>O(n) &#8211; \u9700\u8981\u904d\u5386\u6240\u6709\u63cf\u8ff0\u7b26<\/td>\n<\/tr>\n<tr>\n<td>\u6700\u5927\u8fde\u63a5\u6570<\/td>\n<td>\u901a\u5e381024(\u53d6\u51b3\u4e8eFD_SETSIZE)<\/td>\n<\/tr>\n<tr>\n<td>\u5185\u5b58\u4f7f\u7528<\/td>\n<td>\u56fa\u5b9a\u5927\u5c0f\u7684\u4f4d\u56fe<\/td>\n<\/tr>\n<tr>\n<td>\u53ef\u79fb\u690d\u6027<\/td>\n<td>\u51e0\u4e4e\u6240\u6709\u5e73\u53f0\u90fd\u652f\u6301<\/td>\n<\/tr>\n<tr>\n<td>\u9002\u7528\u573a\u666f<\/td>\n<td>\u8fde\u63a5\u6570\u5c11\u4e14\u8de8\u5e73\u53f0\u9700\u6c42\u5f3a\u7684\u573a\u666f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>&#x1f308; \u66f4\u9ad8\u6548\u7684\u66ff\u4ee3\u65b9\u6848&#xff1a;poll\u548cepoll<\/h2>\n<h3>1. poll\u673a\u5236&#xff1a;select\u7684\u6539\u8fdb\u7248<\/h3>\n<p>poll\u89e3\u51b3\u4e86select\u7684\u4e00\u4e9b\u9650\u5236&#xff0c;\u7279\u522b\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u7684\u9650\u5236\u3002<\/p>\n<p><span class=\"token comment\">\/\/ poll\u4f7f\u7528\u793a\u4f8b<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">pollfd<\/span> fds<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\nfds<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> lfd<span class=\"token punctuation\">;<\/span><br \/>\nfds<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> POLLIN<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> nfds <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">poll<\/span><span class=\"token punctuation\">(<\/span>fds<span class=\"token punctuation\">,<\/span> nfds<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fds<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>revents <span class=\"token operator\">&amp;<\/span> POLLIN<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u65b0\u8fde\u63a5<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        fds<span class=\"token punctuation\">[<\/span>nfds<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> cfd<span class=\"token punctuation\">;<\/span><br \/>\n        fds<span class=\"token punctuation\">[<\/span>nfds<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> POLLIN<span class=\"token punctuation\">;<\/span><br \/>\n        nfds<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> nfds<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>revents <span class=\"token operator\">&amp;<\/span> POLLIN<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5904\u7406\u5ba2\u6237\u7aef\u6570\u636e<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                fds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> fds<span class=\"token punctuation\">[<\/span>nfds<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                nfds<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                i<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u5904\u7406\u4e1a\u52a1\u903b\u8f91<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>poll\u7684\u6539\u8fdb&#xff1a;<\/p>\n<ul>\n<li>\u6ca1\u6709\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u7684\u9650\u5236<\/li>\n<li>\u4f7f\u7528\u5355\u72ec\u7684\u4e8b\u4ef6\u6570\u7ec4&#xff0c;API\u66f4\u6e05\u6670<\/li>\n<\/ul>\n<p>\u4ecd\u7136\u5b58\u5728\u7684\u95ee\u9898&#xff1a;<\/p>\n<ul>\n<li>\u548cselect\u4e00\u6837\u9700\u8981\u7ebf\u6027\u626b\u63cf<\/li>\n<li>\u5927\u91cf\u8fde\u63a5\u65f6\u6027\u80fd\u4ecd\u7136\u4e0d\u9ad8<\/li>\n<\/ul>\n<h3>2. epoll\u673a\u5236&#xff1a;Linux\u7684\u7ec8\u6781\u6b66\u5668<\/h3>\n<p>epoll\u662fLinux\u7279\u6709\u7684\u9ad8\u6027\u80fd\u591a\u8defIO\u63a5\u53e3&#xff0c;\u5b8c\u7f8e\u89e3\u51b3\u4e86select\/poll\u7684\u6027\u80fd\u74f6\u9888\u3002<\/p>\n<p><span class=\"token comment\">\/\/ epoll\u4f7f\u7528\u793a\u4f8b<\/span><br \/>\n<span class=\"token keyword\">int<\/span> epfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> ev<span class=\"token punctuation\">;<\/span><br \/>\nev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> EPOLLIN<span class=\"token punctuation\">;<\/span><br \/>\nev<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> lfd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epfd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> lfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ev<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> events<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> nready <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_wait<\/span><span class=\"token punctuation\">(<\/span>epfd<span class=\"token punctuation\">,<\/span> events<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1024<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> nready<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>events<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;&#061;<\/span> lfd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u65b0\u8fde\u63a5<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            ev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> EPOLLIN<span class=\"token punctuation\">;<\/span><br \/>\n            ev<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> cfd<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epfd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> cfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ev<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5904\u7406\u5ba2\u6237\u7aef\u6570\u636e<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>events<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epfd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_DEL<span class=\"token punctuation\">,<\/span> events<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>events<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u5904\u7406\u4e1a\u52a1\u903b\u8f91<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>epoll\u7684\u6838\u5fc3\u4f18\u52bf&#xff1a;<\/p>\n<li>\u4e8b\u4ef6\u9a71\u52a8&#xff1a;\u53ea\u8fd4\u56de\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u65e0\u9700\u904d\u5386<\/li>\n<li>\u9ad8\u6548\u5185\u5b58\u4f7f\u7528&#xff1a;\u4f7f\u7528\u7ea2\u9ed1\u6811\u548c\u5c31\u7eea\u94fe\u8868\u7ba1\u7406\u63cf\u8ff0\u7b26<\/li>\n<li>\u8fb9\u7f18\u89e6\u53d1(ET)\u6a21\u5f0f&#xff1a;\u53ef\u4ee5\u8fdb\u4e00\u6b65\u51cf\u5c11\u7cfb\u7edf\u8c03\u7528\u6b21\u6570<\/li>\n<li>\u652f\u6301\u5927\u91cf\u5e76\u53d1\u8fde\u63a5&#xff1a;\u4ec5\u53d7\u7cfb\u7edf\u8d44\u6e90\u9650\u5236<\/li>\n<h3>&#x1f4ca; \u4e09\u79cd\u591a\u8defIO\u673a\u5236\u5bf9\u6bd4<\/h3>\n<p>#mermaid-svg-gTfA0AFY9blx6L3v{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-gTfA0AFY9blx6L3v 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class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u591a\u8defIO\u673a\u5236<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>select<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>poll<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>epoll<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u56fa\u5b9a\u4f4d\u56fe<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>O(n)\u904d\u5386<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>1024\u9650\u5236<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u52a8\u6001\u6570\u7ec4<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>O(n)\u904d\u5386<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u65e0\u786c\u6027\u9650\u5236<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u7ea2\u9ed1\u6811&#043;\u94fe\u8868<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>O(1)\u5c31\u7eea<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u6570\u5341\u4e07\u8fde\u63a5<\/p>\n<p><\/span><\/p>\n<p>\u56fe\u8868\u8bf4\u660e&#xff1a;\u4eceselect\u5230epoll&#xff0c;\u591a\u8defIO\u673a\u5236\u5728\u6027\u80fd\u548c\u53ef\u6269\u5c55\u6027\u4e0a\u6709\u4e86\u8d28\u7684\u98de\u8dc3<\/p>\n<h2>&#x1f3c6; \u5b9e\u9645\u5e94\u7528\u6848\u4f8b<\/h2>\n<h3>\u6848\u4f8b1&#xff1a;Nginx\u7684\u9ad8\u5e76\u53d1\u67b6\u6784<\/h3>\n<p>Nginx\u662f\u4f7f\u7528epoll\u7684\u5178\u578b\u4ee3\u8868&#xff0c;\u5176\u4e8b\u4ef6\u9a71\u52a8\u67b6\u6784\u53ef\u4ee5\u8f7b\u677e\u5904\u7406\u6570\u4e07\u5e76\u53d1\u8fde\u63a5\u3002Nginx\u7684\u5de5\u4f5c\u8fdb\u7a0b\u4f7f\u7528epoll\u76d1\u63a7\u6240\u6709\u76d1\u542c\u5957\u63a5\u5b57\u548c\u6d3b\u52a8\u8fde\u63a5&#xff0c;\u5f53\u4e8b\u4ef6\u53d1\u751f\u65f6&#xff0c;\u7531\u4e8b\u4ef6\u5206\u53d1\u5668\u5c06\u8bf7\u6c42\u4ea4\u7ed9\u5bf9\u5e94\u7684\u5de5\u4f5c\u7ebf\u7a0b\u5904\u7406\u3002<\/p>\n<h3>\u6848\u4f8b2&#xff1a;Redis\u7684\u5355\u7ebf\u7a0b\u9ad8\u6027\u80fd<\/h3>\n<p>Redis\u867d\u7136\u662f\u5355\u7ebf\u7a0b\u6a21\u578b&#xff0c;\u4f46\u901a\u8fc7epoll\u5b9e\u73b0\u4e86\u6781\u9ad8\u7684\u5e76\u53d1\u6027\u80fd\u3002Redis\u5c06\u6240\u6709\u5ba2\u6237\u7aef\u8fde\u63a5\u6ce8\u518c\u5230epoll\u4e2d&#xff0c;\u4e3b\u7ebf\u7a0b\u901a\u8fc7epoll_wait\u83b7\u53d6\u5c31\u7eea\u4e8b\u4ef6&#xff0c;\u7136\u540e\u987a\u5e8f\u5904\u7406\u3002\u8fd9\u79cd\u8bbe\u8ba1\u907f\u514d\u4e86\u9501\u7ade\u4e89&#xff0c;\u540c\u65f6\u5229\u7528epoll\u7684\u9ad8\u6548\u4e8b\u4ef6\u901a\u77e5\u673a\u5236\u3002<\/p>\n<h3>\u6848\u4f8b3&#xff1a;\u5373\u65f6\u901a\u8baf\u670d\u52a1\u5668<\/h3>\n<p>\u4e00\u4e2a\u5178\u578b\u7684\u5373\u65f6\u901a\u8baf\u670d\u52a1\u5668\u9700\u8981\u7ef4\u62a4\u5927\u91cf\u6301\u4e45\u8fde\u63a5&#xff0c;\u540c\u65f6\u5904\u7406\u9891\u7e41\u7684\u5c0f\u6570\u636e\u5305\u4ea4\u6362\u3002\u4f7f\u7528epoll\u7684ET\u6a21\u5f0f\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u7cfb\u7edf\u8c03\u7528\u6b21\u6570&#xff0c;\u63d0\u9ad8\u541e\u5410\u91cf\u3002<\/p>\n<h2>&#x1f6e0;\ufe0f \u6027\u80fd\u4f18\u5316\u6280\u5de7<\/h2>\n<li>\n<p>\u8fb9\u7f18\u89e6\u53d1(ET) vs \u6c34\u5e73\u89e6\u53d1(LT) &#xff1a;<\/p>\n<ul>\n<li>ET\u6a21\u5f0f\u53ea\u5728\u72b6\u6001\u53d8\u5316\u65f6\u901a\u77e5&#xff0c;\u53ef\u4ee5\u51cf\u5c11\u4e8b\u4ef6\u6570\u91cf<\/li>\n<li>LT\u6a21\u5f0f\u5728\u5c31\u7eea\u72b6\u6001\u4e0b\u6301\u7eed\u901a\u77e5&#xff0c;\u7f16\u7a0b\u66f4\u7b80\u5355<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u8fde\u63a5\u7ba1\u7406&#xff1a;<\/p>\n<ul>\n<li>\u4f7f\u7528\u975e\u963b\u585eIO\u907f\u514d\u5355\u4e2a\u6162\u5ba2\u6237\u7aef\u5f71\u54cd\u6574\u4f53<\/li>\n<li>\u5b9e\u73b0\u8fde\u63a5\u8d85\u65f6\u548c\u5fc3\u8df3\u673a\u5236<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u4e8b\u4ef6\u5904\u7406&#xff1a;<\/p>\n<ul>\n<li>\u907f\u514d\u5728\u4e8b\u4ef6\u5faa\u73af\u4e2d\u8fdb\u884c\u8017\u65f6\u64cd\u4f5c<\/li>\n<li>\u4f7f\u7528\u7ebf\u7a0b\u6c60\u5904\u7406\u8ba1\u7b97\u5bc6\u96c6\u578b\u4efb\u52a1<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u7f13\u51b2\u533a\u8bbe\u8ba1&#xff1a;<\/p>\n<ul>\n<li>\u4e3a\u6bcf\u4e2a\u8fde\u63a5\u7ef4\u62a4\u72ec\u7acb\u7684\u8bfb\u5199\u7f13\u51b2\u533a<\/li>\n<li>\u5b9e\u73b0\u5408\u7406\u7684\u7f13\u51b2\u533a\u5927\u5c0f\u548c\u6269\u5bb9\u7b56\u7565<\/li>\n<\/ul>\n<\/li>\n<h2>&#x1f31f; \u603b\u7ed3\u4e0e\u5c55\u671b<\/h2>\n<p>\u4ece\u591a\u8fdb\u7a0b\/\u591a\u7ebf\u7a0b\u5230\u591a\u8defIO\u8f6c\u63a5&#xff0c;Linux\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u5b9e\u73b0\u6280\u672f\u7ecf\u5386\u4e86\u9769\u547d\u6027\u7684\u6f14\u8fdb\u3002select\/poll\/epoll\u7b49\u673a\u5236\u8ba9\u6211\u4eec\u80fd\u591f\u4ee5\u66f4\u5c11\u7684\u8d44\u6e90\u670d\u52a1\u66f4\u591a\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\u3002\u7279\u522b\u662fepoll\u7684\u51fa\u73b0&#xff0c;\u4f7f\u5f97\u5355\u673a\u5904\u7406\u6570\u5341\u4e07\u5e76\u53d1\u8fde\u63a5\u6210\u4e3a\u53ef\u80fd\u3002<\/p>\n<p>\u672a\u6765&#xff0c;\u968f\u7740io_uring\u7b49\u65b0\u578b\u5f02\u6b65IO\u63a5\u53e3\u7684\u6210\u719f&#xff0c;Linux\u670d\u52a1\u5668\u7684\u9ad8\u5e76\u53d1\u80fd\u529b\u8fd8\u5c06\u8fdb\u4e00\u6b65\u63d0\u5347\u3002\u540c\u65f6&#xff0c;\u7ed3\u5408\u534f\u7a0b\u7b49\u8f7b\u91cf\u7ea7\u5e76\u53d1\u6a21\u578b&#xff0c;\u53ef\u4ee5\u6784\u5efa\u51fa\u66f4\u52a0\u9ad8\u6548\u3001\u6613\u7528\u7684\u670d\u52a1\u5668\u6846\u67b6\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/03\/20260301232545-69a4caf9ce8ed.jpg\" alt=\"Linux\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u5b9e\u73b0\u539f\u7406&#xff1a;\u4ece\u591a\u8fdb\u7a0b\u5230\u591a\u8defIO\u8f6c\u63a5\u7684\u6f14\u8fdb\u4e4b\u8def\" \/><\/p>\n<p>\u65e0\u8bba\u6280\u672f\u5982\u4f55\u53d1\u5c55&#xff0c;\u7406\u89e3\u8fd9\u4e9b\u5e95\u5c42\u673a\u5236\u7684\u539f\u7406\u548c\u4f18\u52a3&#xff0c;\u5bf9\u4e8e\u8bbe\u8ba1\u9ad8\u6027\u80fd\u670d\u52a1\u5668\u67b6\u6784\u90fd\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002\u5e0c\u671b\u672c\u6587\u80fd\u4e3a\u60a8\u5728\u6784\u5efa\u9ad8\u5e76\u53d1\u7cfb\u7edf\u7684\u9053\u8def\u4e0a\u63d0\u4f9b\u6709\u4ef7\u503c\u7684\u53c2\u8003\u548c\u542f\u793a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#x1f31f; Linux\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u5b9e\u73b0\u539f\u7406&#xff1a;\u4ece\u591a\u8fdb\u7a0b\u5230\u591a\u8defIO\u8f6c\u63a5\u7684\u6f14\u8fdb\u4e4b\u8def<br \/>\n&#x1f680; \u5f15\u8a00&#xff1a;\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u6311\u6218<br \/>\n\u5728\u4e92\u8054\u7f51\u5e94\u7528\u7206\u70b8\u5f0f\u589e\u957f\u7684\u4eca\u5929&#xff0c;\u670d\u52a1\u5668\u9700\u8981\u540c\u65f6\u5904\u7406\u6210\u5343\u4e0a\u4e07\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\u5df2\u6210\u4e3a\u5e38\u6001\u3002\u60f3\u8c61\u4e00\u4e0b&#xff0c;\u4e00\u4e2a\u7535\u5546\u5e73\u53f0\u5728\\&#8221;\u53cc\u5341\u4e00\\&#8221;\u671f\u95f4&#xff0c;\u6bcf\u79d2\u9700\u8981\u5904\u7406\u6570\u5341\u4e07\u751a\u81f3\u4e0a\u767e\u4e07\u7684\u8bf7\u6c42\u2014\u2014\u8fd9\u5c31\u662f\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u7528\u6b66\u4e4b\u5730\u3002\u672c\u6587\u5c06\u5e26\u60a8\u6df1\u5165\u63a2\u7d22Linux\u73af\u5883\u4e0b\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u5b9e\u73b0\u539f\u7406&#xff0c;\u4ece\u4f20\u7edf\u7684\u591a\u8fdb\u7a0b\/\u591a<\/p>\n","protected":false},"author":2,"featured_media":79417,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,58,190,43,442,3433],"topic":[],"class_list":["post-79418","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-c","tag-linux","tag-190","tag-43","tag-442","tag-3433"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Linux\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u5b9e\u73b0\u539f\u7406\uff1a\u4ece\u591a\u8fdb\u7a0b\u5230\u591a\u8defIO\u8f6c\u63a5\u7684\u6f14\u8fdb\u4e4b\u8def - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/79418.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u5b9e\u73b0\u539f\u7406\uff1a\u4ece\u591a\u8fdb\u7a0b\u5230\u591a\u8defIO\u8f6c\u63a5\u7684\u6f14\u8fdb\u4e4b\u8def - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"&#x1f31f; Linux\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u5b9e\u73b0\u539f\u7406&#xff1a;\u4ece\u591a\u8fdb\u7a0b\u5230\u591a\u8defIO\u8f6c\u63a5\u7684\u6f14\u8fdb\u4e4b\u8def &#x1f680; \u5f15\u8a00&#xff1a;\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u6311\u6218 \u5728\u4e92\u8054\u7f51\u5e94\u7528\u7206\u70b8\u5f0f\u589e\u957f\u7684\u4eca\u5929&#xff0c;\u670d\u52a1\u5668\u9700\u8981\u540c\u65f6\u5904\u7406\u6210\u5343\u4e0a\u4e07\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\u5df2\u6210\u4e3a\u5e38\u6001\u3002\u60f3\u8c61\u4e00\u4e0b&#xff0c;\u4e00\u4e2a\u7535\u5546\u5e73\u53f0\u5728&quot;\u53cc\u5341\u4e00&quot;\u671f\u95f4&#xff0c;\u6bcf\u79d2\u9700\u8981\u5904\u7406\u6570\u5341\u4e07\u751a\u81f3\u4e0a\u767e\u4e07\u7684\u8bf7\u6c42\u2014\u2014\u8fd9\u5c31\u662f\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u7528\u6b66\u4e4b\u5730\u3002\u672c\u6587\u5c06\u5e26\u60a8\u6df1\u5165\u63a2\u7d22Linux\u73af\u5883\u4e0b\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u5b9e\u73b0\u539f\u7406&#xff0c;\u4ece\u4f20\u7edf\u7684\u591a\u8fdb\u7a0b\/\u591a\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/79418.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta 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