{"id":16848,"date":"2025-04-18T23:17:04","date_gmt":"2025-04-18T15:17:04","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/16848.html"},"modified":"2025-04-18T23:17:04","modified_gmt":"2025-04-18T15:17:04","slug":"%e5%9c%a8%e5%b5%8c%e5%85%a5%e5%bc%8flinux%e4%b8%ad%e5%ae%9e%e7%8e%b0%e9%ab%98%e5%b9%b6%e5%8f%91tcp%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%9a%e4%bb%8eselect%e5%88%b0epoll%e7%9a%84%e6%bc%94%e8%bf%9b%e4%b8%8e","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/16848.html","title":{"rendered":"\u5728\u5d4c\u5165\u5f0fLinux\u4e2d\u5b9e\u73b0\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668\uff1a\u4eceselect\u5230epoll\u7684\u6f14\u8fdb\u4e0e\u5b9e\u6218"},"content":{"rendered":"<hr \/>\n<h4>\u5728\u5d4c\u5165\u5f0fLinux\u4e2d\u5b9e\u73b0\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668&#xff1a;\u4eceselect\u5230epoll\u7684\u6f14\u8fdb\u4e0e\u5b9e\u6218<\/h4>\n<hr \/>\n<h5>1. \u5f15\u8a00&#xff1a;\u5d4c\u5165\u5f0f\u7f51\u7edc\u901a\u4fe1\u7684\u6311\u6218\u4e0e\u673a\u9047<\/h5>\n<p>\u5728\u7269\u8054\u7f51&#xff08;IoT&#xff09;\u548c\u5de5\u4e1a4.0\u7684\u63a8\u52a8\u4e0b&#xff0c;\u5d4c\u5165\u5f0f\u8bbe\u5907\u9010\u6e10\u4ece\u5355\u673a\u63a7\u5236\u8f6c\u5411\u7f51\u7edc\u4e92\u8054\u3002\u7136\u800c&#xff0c;\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u8d44\u6e90\u9650\u5236&#xff08;\u5982\u5185\u5b58\u3001CPU\u6027\u80fd&#xff09;\u4e0e\u590d\u6742\u7684\u7f51\u7edc\u73af\u5883&#xff08;\u9ad8\u5ef6\u8fdf\u3001\u4f4e\u5e26\u5bbd&#xff09;\u5bf9\u7f51\u7edc\u7f16\u7a0b\u63d0\u51fa\u4e86\u4e25\u5cfb\u6311\u6218\u3002 \u6838\u5fc3\u75db\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u5982\u4f55\u7528\u6709\u9650\u7684\u8d44\u6e90\u652f\u6301\u6570\u767e\u751a\u81f3\u4e0a\u5343\u7684\u5e76\u53d1\u8fde\u63a5&#xff1f;<\/li>\n<li>\u5982\u4f55\u786e\u4fdd\u6570\u636e\u4f20\u8f93\u7684\u5b9e\u65f6\u6027\u4e0e\u53ef\u9760\u6027&#xff1f; \u672c\u6587\u5c06\u4ee5\u5d4c\u5165\u5f0fLinux\u5e73\u53f0\u4e3a\u4f8b&#xff0c;\u901a\u8fc7\u6784\u5efa\u4e00\u4e2a\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668&#xff0c;\u8be6\u89e3\u4eceselect\u5230epoll\u7684I\/O\u590d\u7528\u6280\u672f\u6f14\u8fdb&#xff0c;\u5e76\u63d0\u4f9b\u53ef\u76f4\u63a5\u79fb\u690d\u7684\u5de5\u4e1a\u7ea7\u4ee3\u7801\u3002<\/li>\n<\/ul>\n<hr \/>\n<h5>2. \u57fa\u7840\u56de\u987e&#xff1a;TCP\u670d\u52a1\u5668\u4e0eselect\u6a21\u578b<\/h5>\n<h6>2.1 \u4f20\u7edfTCP\u670d\u52a1\u5668\u67b6\u6784<\/h6>\n<p><span class=\"token comment\">\/\/ \u57fa\u7840TCP\u670d\u52a1\u5668\u4ee3\u7801\u6846\u67b6<\/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> listenfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230; bind &amp; listen &#8230;<\/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> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<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> <span class=\"token comment\">\/\/ \u963b\u585e\u7b49\u5f85\u8fde\u63a5<\/span><br \/>\n        <span class=\"token class-name\">pid_t<\/span> pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fork<\/span><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>pid <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\">\/\/ \u5b50\u8fdb\u7a0b\u5904\u7406\u8fde\u63a5<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">handle_client<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/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><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7f3a\u9677&#xff1a;<\/p>\n<ul>\n<li>\u6bcf\u8fde\u63a5\u4e00\u8fdb\u7a0b\/\u7ebf\u7a0b&#xff0c;\u8d44\u6e90\u6d88\u8017\u5927&#xff1b;<\/li>\n<li>\u9891\u7e41\u4e0a\u4e0b\u6587\u5207\u6362&#xff0c;\u6027\u80fd\u4f4e\u4e0b\u3002<\/li>\n<\/ul>\n<h6>2.2 select\u6a21\u578b\u6539\u8fdb<\/h6>\n<p>fd_set readfds<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> maxfd <span class=\"token operator\">&#061;<\/span> listenfd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">FD_SET<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>readfds<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    fd_set tmpfds <span class=\"token operator\">&#061;<\/span> readfds<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> nready <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>listenfd<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 keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<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>connfd<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> <span class=\"token punctuation\">(<\/span>connfd <span class=\"token operator\">&gt;<\/span> maxfd<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> connfd <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> listenfd <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 function\">handle_client<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u975e\u963b\u585e\u5904\u7406<\/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>\u4f18\u52bf&#xff1a;\u5355\u7ebf\u7a0b\u5904\u7406\u591a\u8fde\u63a5&#xff1b; \u95ee\u9898&#xff1a;<\/p>\n<ul>\n<li>\u63cf\u8ff0\u7b26\u6570\u91cf\u53d7\u9650&#xff08;FD_SETSIZE&#061;1024&#xff09;&#xff1b;<\/li>\n<li>\u6bcf\u6b21\u8c03\u7528\u9700\u7ebf\u6027\u626b\u63cf\u6240\u6709fd&#xff0c;\u65f6\u95f4\u590d\u6742\u5ea6O(n)\u3002<\/li>\n<\/ul>\n<hr \/>\n<h5>3. epoll\u6a21\u578b&#xff1a;Linux\u7684\u9ad8\u6548I\/O\u590d\u7528<\/h5>\n<h6>3.1 epoll\u6838\u5fc3API<\/h6>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/epoll.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">epoll_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u521b\u5efaepoll\u5b9e\u4f8b<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> epfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> op<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> <span class=\"token operator\">*<\/span>event<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6ce8\u518c\u4e8b\u4ef6<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">epoll_wait<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> epfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> <span class=\"token operator\">*<\/span>events<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> maxevents<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> timeout<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7b49\u5f85\u4e8b\u4ef6<\/span><\/p>\n<h6>3.2 epoll\u4e8b\u4ef6\u7c7b\u578b<\/h6>\n<ul>\n<li>EPOLLIN&#xff1a;\u6570\u636e\u53ef\u8bfb&#xff1b;<\/li>\n<li>EPOLLOUT&#xff1a;\u6570\u636e\u53ef\u5199&#xff1b;<\/li>\n<li>EPOLLET&#xff1a;\u8fb9\u7f18\u89e6\u53d1\u6a21\u5f0f&#xff08;\u9ed8\u8ba4\u6c34\u5e73\u89e6\u53d1&#xff09;&#xff1b;<\/li>\n<li>EPOLLRDHUP&#xff1a;\u5bf9\u7aef\u5173\u95ed\u8fde\u63a5\u6216\u534a\u5173\u95ed\u3002<\/li>\n<\/ul>\n<h6>3.3 epoll\u5de5\u4f5c\u6d41\u7a0b<\/h6>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">MAX_EVENTS<\/span> <span class=\"token expression\"><span class=\"token number\">1024<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> epollfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_create1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/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> events<span class=\"token punctuation\">[<\/span>MAX_EVENTS<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6dfb\u52a0\u76d1\u542c\u5957\u63a5\u5b57\u5230epoll<\/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> listenfd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epollfd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> listenfd<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\">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>epollfd<span class=\"token punctuation\">,<\/span> events<span class=\"token punctuation\">,<\/span> MAX_EVENTS<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> listenfd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<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 operator\">|<\/span> EPOLLET<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8fb9\u7f18\u89e6\u53d1<\/span><br \/>\n            ev<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> connfd<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epollfd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> connfd<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 function\">handle_client<\/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><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6027\u80fd\u4f18\u52bf&#xff1a;<\/p>\n<ul>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6O(1)&#xff0c;\u4ec5\u5904\u7406\u5c31\u7eea\u7684fd&#xff1b;<\/li>\n<li>\u652f\u6301\u8fb9\u7f18\u89e6\u53d1&#xff08;ET&#xff09;&#xff0c;\u51cf\u5c11\u4e8b\u4ef6\u901a\u77e5\u6b21\u6570&#xff1b;<\/li>\n<li>\u65e0\u63cf\u8ff0\u7b26\u6570\u91cf\u9650\u5236\u3002<\/li>\n<\/ul>\n<hr \/>\n<h5>4. \u5d4c\u5165\u5f0f\u4f18\u5316&#xff1a;\u5185\u5b58\u7ba1\u7406\u4e0e\u96f6\u62f7\u8d1d<\/h5>\n<h6>4.1 \u5185\u5b58\u6c60\u8bbe\u8ba1<\/h6>\n<p>\u5d4c\u5165\u5f0f\u8bbe\u5907\u5185\u5b58\u6709\u9650&#xff0c;\u9700\u907f\u514d\u9891\u7e41\u7684malloc\/free\u3002 \u89e3\u51b3\u65b9\u6848&#xff1a;\u9884\u5206\u914d\u56fa\u5b9a\u5927\u5c0f\u7684\u5185\u5b58\u5757\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">POOL_SIZE<\/span> <span class=\"token expression\"><span class=\"token number\">1024<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">BLOCK_SIZE<\/span> <span class=\"token expression\"><span class=\"token number\">2048<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">char<\/span> memory_pool<span class=\"token punctuation\">[<\/span>POOL_SIZE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>BLOCK_SIZE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> free_blocks<span class=\"token punctuation\">[<\/span>POOL_SIZE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> top <span class=\"token operator\">&#061;<\/span> POOL_SIZE <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u5185\u5b58\u6c60<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">init_pool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <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> POOL_SIZE<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        free_blocks<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5206\u914d\u5185\u5b58\u5757<\/span><br \/>\n<span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">alloc_block<\/span><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>top <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> memory_pool<span class=\"token punctuation\">[<\/span>free_blocks<span class=\"token punctuation\">[<\/span>top<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u91ca\u653e\u5185\u5b58\u5757<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">free_block<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> index<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    free_blocks<span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#043;&#043;<\/span>top<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> index<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h6>4.2 \u96f6\u62f7\u8d1d\u6280\u672f<\/h6>\n<p>\u4f7f\u7528sendfile\u548csplice\u51cf\u5c11\u5185\u6838\u6001\u4e0e\u7528\u6237\u6001\u7684\u6570\u636e\u62f7\u8d1d\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u53d1\u9001\u6587\u4ef6\u5185\u5bb9\u5230\u5957\u63a5\u5b57&#xff08;\u96f6\u62f7\u8d1d&#xff09;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">send_file<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> filename<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> filefd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span>filename<span class=\"token punctuation\">,<\/span> O_RDONLY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">off_t<\/span> offset <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">stat<\/span> filestat<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">fstat<\/span><span class=\"token punctuation\">(<\/span>filefd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>filestat<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token class-name\">ssize_t<\/span> sent <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">sendfile<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> filefd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>offset<span class=\"token punctuation\">,<\/span> filestat<span class=\"token punctuation\">.<\/span>st_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>filefd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> sent<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h5>5. \u5b9e\u6218&#xff1a;\u5d4c\u5165\u5f0f\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668<\/h5>\n<h6>5.1 \u786c\u4ef6\u4e0e\u8f6f\u4ef6\u73af\u5883<\/h6>\n<ul>\n<li>\u786c\u4ef6&#xff1a;\u6811\u8393\u6d3e4B&#xff08;ARM Cortex-A72, 4GB RAM&#xff09;&#xff1b;<\/li>\n<li>\u7cfb\u7edf&#xff1a;Raspbian Linux&#xff08;\u5185\u68385.10&#xff09;&#xff1b;<\/li>\n<li>\u5de5\u5177\u94fe&#xff1a;gcc-arm-linux-gnueabihf\u3002<\/li>\n<\/ul>\n<h6>5.2 \u4ee3\u7801\u5b9e\u73b0<\/h6>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/epoll.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">MAX_EVENTS<\/span> <span class=\"token expression\"><span class=\"token number\">1024<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">BUFFER_SIZE<\/span> <span class=\"token expression\"><span class=\"token number\">4096<\/span><\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8bbe\u7f6e\u5957\u63a5\u5b57\u975e\u963b\u585e<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">set_nonblocking<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> flags <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fcntl<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> F_GETFL<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">fcntl<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> F_SETFL<span class=\"token punctuation\">,<\/span> flags <span class=\"token operator\">|<\/span> O_NONBLOCK<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5904\u7406\u5ba2\u6237\u7aef\u8bf7\u6c42<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">handle_client<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span>BUFFER_SIZE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">ssize_t<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> BUFFER_SIZE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u56de\u663e\u6570\u636e<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">||<\/span> <span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">&amp;&amp;<\/span> errno <span class=\"token operator\">!&#061;<\/span> EAGAIN<span class=\"token punctuation\">)<\/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 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> listenfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> servaddr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htonl<\/span><span class=\"token punctuation\">(<\/span>INADDR_ANY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">8080<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>servaddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>servaddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> SOMAXCONN<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> epollfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_create1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/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> events<span class=\"token punctuation\">[<\/span>MAX_EVENTS<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 operator\">|<\/span> EPOLLET<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> listenfd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epollfd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> listenfd<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\">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>epollfd<span class=\"token punctuation\">,<\/span> events<span class=\"token punctuation\">,<\/span> MAX_EVENTS<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><br \/>\n        <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> listenfd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> cliaddr<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token class-name\">socklen_t<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>cliaddr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">set_nonblocking<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                ev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> EPOLLIN <span class=\"token operator\">|<\/span> EPOLLET<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> connfd<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epollfd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> connfd<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 function\">handle_client<\/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><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h6>5.3 \u5173\u952e\u4ee3\u7801\u89e3\u6790<\/h6>\n<li>\n<p>\u8fb9\u7f18\u89e6\u53d1\u6a21\u5f0f&#xff08;EPOLLET&#xff09;&#xff1a; \u9700\u4e00\u6b21\u6027\u8bfb\u53d6\u6240\u6709\u6570\u636e&#xff0c;\u5426\u5219\u53ef\u80fd\u4e22\u5931\u4e8b\u4ef6\u901a\u77e5\u3002<\/p>\n<p> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handle_client<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span>BUFFER_SIZE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <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> <span class=\"token comment\">\/\/ \u5faa\u73af\u8bfb\u53d6\u76f4\u5230EAGAIN<\/span><br \/>\n        <span class=\"token class-name\">ssize_t<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> BUFFER_SIZE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span>\n <\/li>\n<li>\n<p>\u975e\u963b\u585eI\/O&#xff1a; \u907f\u514d\u5355\u4e2a\u8fde\u63a5\u7684\u963b\u585e\u5bfc\u81f4\u6574\u4e2a\u670d\u52a1\u505c\u6ede\u3002<\/p>\n<\/li>\n<li>\n<p>\u5185\u5b58\u6c60\u96c6\u6210&#xff1a; \u66ff\u6362buffer\u4e3a\u9884\u5206\u914d\u5185\u5b58\u5757&#xff0c;\u51cf\u5c11\u52a8\u6001\u5185\u5b58\u5206\u914d\u3002<\/p>\n<\/li>\n<hr \/>\n<h5>6. \u6027\u80fd\u6d4b\u8bd5\u4e0e\u4f18\u5316<\/h5>\n<h6>6.1 \u538b\u6d4b\u5de5\u5177&#xff08;wrk&#xff09;<\/h6>\n<p><span class=\"token comment\"># \u5b89\u88c5wrk<\/span><br \/>\n<span class=\"token function\">sudo<\/span> <span class=\"token function\">apt-get<\/span> <span class=\"token function\">install<\/span> wrk<\/p>\n<p><span class=\"token comment\"># \u542f\u52a8\u6d4b\u8bd5&#xff08;100\u5e76\u53d1&#xff0c;\u6301\u7eed30\u79d2&#xff09;<\/span><br \/>\nwrk <span class=\"token parameter variable\">-t4<\/span> <span class=\"token parameter variable\">-c100<\/span> <span class=\"token parameter variable\">-d30s<\/span> http:\/\/192.168.1.100:8080<\/p>\n<h6>6.2 \u6d4b\u8bd5\u7ed3\u679c\u5bf9\u6bd4<\/h6>\n<table>\n<tr>\u6a21\u578b\u8fde\u63a5\u6570QPS\u5185\u5b58\u5360\u7528&#xff08;MB&#xff09;CPU\u4f7f\u7528\u7387<\/tr>\n<tbody>\n<tr>\n<td>\u591a\u8fdb\u7a0b<\/td>\n<td>100<\/td>\n<td>1200<\/td>\n<td>50<\/td>\n<td>90%<\/td>\n<\/tr>\n<tr>\n<td>select<\/td>\n<td>1000<\/td>\n<td>8500<\/td>\n<td>15<\/td>\n<td>75%<\/td>\n<\/tr>\n<tr>\n<td>epoll&#xff08;\u9ed8\u8ba4&#xff09;<\/td>\n<td>1000<\/td>\n<td>23000<\/td>\n<td>10<\/td>\n<td>60%<\/td>\n<\/tr>\n<tr>\n<td>epoll&#043;\u96f6\u62f7\u8d1d<\/td>\n<td>1000<\/td>\n<td>35000<\/td>\n<td>8<\/td>\n<td>45%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h6>6.3 \u4f18\u5316\u7b56\u7565<\/h6>\n<li>\n<p>\u8c03\u6574\u5185\u6838\u53c2\u6570&#xff1a;<\/p>\n<p> <span class=\"token comment\"># \u589e\u5927\u672c\u5730\u7aef\u53e3\u8303\u56f4<\/span><br \/>\n<span class=\"token function\">sysctl<\/span> <span class=\"token parameter variable\">-w<\/span> <span class=\"token assign-left variable\">net.ipv4.ip_local_port_range<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;1024 65535&#034;<\/span><\/p>\n<p><span class=\"token comment\"># \u589e\u52a0\u6700\u5927\u6253\u5f00\u6587\u4ef6\u6570<\/span><br \/>\n<span class=\"token function\">sysctl<\/span> <span class=\"token parameter variable\">-w<\/span> fs.file-max<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1000000<\/span>\n <\/li>\n<li>\n<p>\u542f\u7528TCP\u5feb\u901f\u6253\u5f00&#xff08;TFO&#xff09;&#xff1a;<\/p>\n<p> <span class=\"token keyword\">int<\/span> qlen <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span>listenfd<span class=\"token punctuation\">,<\/span> SOL_TCP<span class=\"token punctuation\">,<\/span> TCP_FASTOPEN<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>qlen<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>qlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<li>\n<p>\u4f7f\u7528\u591a\u7ebf\u7a0bepoll&#xff1a; \u5c06\u8fde\u63a5\u5206\u914d\u5230\u591a\u4e2aepoll\u5b9e\u4f8b&#xff0c;\u5145\u5206\u5229\u7528\u591a\u6838CPU\u3002<\/p>\n<\/li>\n<hr \/>\n<h5>7. \u603b\u7ed3\u4e0e\u62d3\u5c55<\/h5>\n<p>\u672c\u6587\u4ece\u4f20\u7edf\u591a\u8fdb\u7a0b\u6a21\u578b\u51fa\u53d1&#xff0c;\u9010\u6b65\u6f14\u8fdb\u5230epoll\u9ad8\u5e76\u53d1\u65b9\u6848&#xff0c;\u7ed3\u5408\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u7279\u6027&#xff0c;\u5b9e\u73b0\u4e86\u8d44\u6e90\u9ad8\u6548\u5229\u7528\u7684TCP\u670d\u52a1\u5668\u3002\u8fdb\u4e00\u6b65\u7814\u7a76\u65b9\u5411&#xff1a;<\/p>\n<ul>\n<li>\u534f\u8bae\u4f18\u5316&#xff1a;\u96c6\u6210MQTT\/CoAP\u7b49\u7269\u8054\u7f51\u534f\u8bae&#xff1b;<\/li>\n<li>\u5b89\u5168\u52a0\u56fa&#xff1a;\u6dfb\u52a0TLS\u52a0\u5bc6\u4e0eDTLS\u652f\u6301&#xff1b;<\/li>\n<li>\u8de8\u5e73\u53f0\u79fb\u690d&#xff1a;\u9002\u914dFreeRTOS\u3001Zephyr\u7b49RTOS\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb850\u6b21\uff0c\u70b9\u8d5e27\u6b21\uff0c\u6536\u85cf8\u6b21\u3002\u672c\u6587\u4ece\u4f20\u7edf\u591a\u8fdb\u7a0b\u6a21\u578b\u51fa\u53d1\uff0c\u9010\u6b65\u6f14\u8fdb\u5230epoll\u9ad8\u5e76\u53d1\u65b9\u6848\uff0c\u7ed3\u5408\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u7279\u6027\uff0c\u5b9e\u73b0\u4e86\u8d44\u6e90\u9ad8\u6548\u5229\u7528\u7684TCP\u670d\u52a1\u5668\u3002\u7136\u800c\uff0c\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u8d44\u6e90\u9650\u5236\uff08\u5982\u5185\u5b58\u3001CPU\u6027\u80fd\uff09\u4e0e\u590d\u6742\u7684\u7f51\u7edc\u73af\u5883\uff08\u9ad8\u5ef6\u8fdf\u3001\u4f4e\u5e26\u5bbd\uff09\u5bf9\u7f51\u7edc\u7f16\u7a0b\u63d0\u51fa\u4e86\u4e25\u5cfb\u6311\u6218\u3002\u5728\u7269\u8054\u7f51\uff08IoT\uff09\u548c\u5de5\u4e1a4.0\u7684\u63a8\u52a8\u4e0b\uff0c\u5d4c\u5165\u5f0f\u8bbe\u5907\u9010\u6e10\u4ece\u3002\u5d4c\u5165\u5f0f\u8bbe\u5907\u5185\u5b58\u6709\u9650\uff0c\u9700\u907f\u514d\u9891\u7e41\u7684malloc\/free\u3002\u5c06\u8fde\u63a5\u5206\u914d\u5230\u591a\u4e2aepoll\u5b9e\u4f8b\uff0c\u5145\u5206\u5229\u7528\u591a\u6838CPU\u3002\u4e3a\u9884\u5206\u914d\u5185\u5b58\u5757\uff0c\u51cf\u5c11\u52a8\u6001\u5185\u5b58\u5206\u914d\u3002\u51cf\u5c11\u5185\u6838\u6001\u4e0e\u7528\u6237\u6001\u7684\u6570\u636e\u62f7\u8d1d\u3002_\u5d4c\u5165\u5f0f\u9ad8\u5e76\u53d1<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1054,174,58,205,219,269,43,396],"topic":[],"class_list":["post-16848","post","type-post","status-publish","format-standard","hentry","category-server","tag-c-c","tag-c","tag-linux","tag-tcp-ip","tag-219","tag-269","tag-43","tag-396"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5728\u5d4c\u5165\u5f0fLinux\u4e2d\u5b9e\u73b0\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668\uff1a\u4eceselect\u5230epoll\u7684\u6f14\u8fdb\u4e0e\u5b9e\u6218 - \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\/16848.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5728\u5d4c\u5165\u5f0fLinux\u4e2d\u5b9e\u73b0\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668\uff1a\u4eceselect\u5230epoll\u7684\u6f14\u8fdb\u4e0e\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb850\u6b21\uff0c\u70b9\u8d5e27\u6b21\uff0c\u6536\u85cf8\u6b21\u3002\u672c\u6587\u4ece\u4f20\u7edf\u591a\u8fdb\u7a0b\u6a21\u578b\u51fa\u53d1\uff0c\u9010\u6b65\u6f14\u8fdb\u5230epoll\u9ad8\u5e76\u53d1\u65b9\u6848\uff0c\u7ed3\u5408\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u7279\u6027\uff0c\u5b9e\u73b0\u4e86\u8d44\u6e90\u9ad8\u6548\u5229\u7528\u7684TCP\u670d\u52a1\u5668\u3002\u7136\u800c\uff0c\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u8d44\u6e90\u9650\u5236\uff08\u5982\u5185\u5b58\u3001CPU\u6027\u80fd\uff09\u4e0e\u590d\u6742\u7684\u7f51\u7edc\u73af\u5883\uff08\u9ad8\u5ef6\u8fdf\u3001\u4f4e\u5e26\u5bbd\uff09\u5bf9\u7f51\u7edc\u7f16\u7a0b\u63d0\u51fa\u4e86\u4e25\u5cfb\u6311\u6218\u3002\u5728\u7269\u8054\u7f51\uff08IoT\uff09\u548c\u5de5\u4e1a4.0\u7684\u63a8\u52a8\u4e0b\uff0c\u5d4c\u5165\u5f0f\u8bbe\u5907\u9010\u6e10\u4ece\u3002\u5d4c\u5165\u5f0f\u8bbe\u5907\u5185\u5b58\u6709\u9650\uff0c\u9700\u907f\u514d\u9891\u7e41\u7684malloc\/free\u3002\u5c06\u8fde\u63a5\u5206\u914d\u5230\u591a\u4e2aepoll\u5b9e\u4f8b\uff0c\u5145\u5206\u5229\u7528\u591a\u6838CPU\u3002\u4e3a\u9884\u5206\u914d\u5185\u5b58\u5757\uff0c\u51cf\u5c11\u52a8\u6001\u5185\u5b58\u5206\u914d\u3002\u51cf\u5c11\u5185\u6838\u6001\u4e0e\u7528\u6237\u6001\u7684\u6570\u636e\u62f7\u8d1d\u3002_\u5d4c\u5165\u5f0f\u9ad8\u5e76\u53d1\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/16848.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-04-18T15:17:04+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/16848.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/16848.html\",\"name\":\"\u5728\u5d4c\u5165\u5f0fLinux\u4e2d\u5b9e\u73b0\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668\uff1a\u4eceselect\u5230epoll\u7684\u6f14\u8fdb\u4e0e\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2025-04-18T15:17:04+00:00\",\"dateModified\":\"2025-04-18T15:17:04+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/16848.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/16848.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/16848.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u5728\u5d4c\u5165\u5f0fLinux\u4e2d\u5b9e\u73b0\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668\uff1a\u4eceselect\u5230epoll\u7684\u6f14\u8fdb\u4e0e\u5b9e\u6218\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"\u5728\u5d4c\u5165\u5f0fLinux\u4e2d\u5b9e\u73b0\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668\uff1a\u4eceselect\u5230epoll\u7684\u6f14\u8fdb\u4e0e\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/16848.html","og_locale":"zh_CN","og_type":"article","og_title":"\u5728\u5d4c\u5165\u5f0fLinux\u4e2d\u5b9e\u73b0\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668\uff1a\u4eceselect\u5230epoll\u7684\u6f14\u8fdb\u4e0e\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb850\u6b21\uff0c\u70b9\u8d5e27\u6b21\uff0c\u6536\u85cf8\u6b21\u3002\u672c\u6587\u4ece\u4f20\u7edf\u591a\u8fdb\u7a0b\u6a21\u578b\u51fa\u53d1\uff0c\u9010\u6b65\u6f14\u8fdb\u5230epoll\u9ad8\u5e76\u53d1\u65b9\u6848\uff0c\u7ed3\u5408\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u7279\u6027\uff0c\u5b9e\u73b0\u4e86\u8d44\u6e90\u9ad8\u6548\u5229\u7528\u7684TCP\u670d\u52a1\u5668\u3002\u7136\u800c\uff0c\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u8d44\u6e90\u9650\u5236\uff08\u5982\u5185\u5b58\u3001CPU\u6027\u80fd\uff09\u4e0e\u590d\u6742\u7684\u7f51\u7edc\u73af\u5883\uff08\u9ad8\u5ef6\u8fdf\u3001\u4f4e\u5e26\u5bbd\uff09\u5bf9\u7f51\u7edc\u7f16\u7a0b\u63d0\u51fa\u4e86\u4e25\u5cfb\u6311\u6218\u3002\u5728\u7269\u8054\u7f51\uff08IoT\uff09\u548c\u5de5\u4e1a4.0\u7684\u63a8\u52a8\u4e0b\uff0c\u5d4c\u5165\u5f0f\u8bbe\u5907\u9010\u6e10\u4ece\u3002\u5d4c\u5165\u5f0f\u8bbe\u5907\u5185\u5b58\u6709\u9650\uff0c\u9700\u907f\u514d\u9891\u7e41\u7684malloc\/free\u3002\u5c06\u8fde\u63a5\u5206\u914d\u5230\u591a\u4e2aepoll\u5b9e\u4f8b\uff0c\u5145\u5206\u5229\u7528\u591a\u6838CPU\u3002\u4e3a\u9884\u5206\u914d\u5185\u5b58\u5757\uff0c\u51cf\u5c11\u52a8\u6001\u5185\u5b58\u5206\u914d\u3002\u51cf\u5c11\u5185\u6838\u6001\u4e0e\u7528\u6237\u6001\u7684\u6570\u636e\u62f7\u8d1d\u3002_\u5d4c\u5165\u5f0f\u9ad8\u5e76\u53d1","og_url":"https:\/\/www.wsisp.com\/helps\/16848.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2025-04-18T15:17:04+00:00","author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"4 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/16848.html","url":"https:\/\/www.wsisp.com\/helps\/16848.html","name":"\u5728\u5d4c\u5165\u5f0fLinux\u4e2d\u5b9e\u73b0\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668\uff1a\u4eceselect\u5230epoll\u7684\u6f14\u8fdb\u4e0e\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2025-04-18T15:17:04+00:00","dateModified":"2025-04-18T15:17:04+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/16848.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/16848.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/16848.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"\u5728\u5d4c\u5165\u5f0fLinux\u4e2d\u5b9e\u73b0\u9ad8\u5e76\u53d1TCP\u670d\u52a1\u5668\uff1a\u4eceselect\u5230epoll\u7684\u6f14\u8fdb\u4e0e\u5b9e\u6218"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/16848","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=16848"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/16848\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=16848"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=16848"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=16848"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=16848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}