{"id":42071,"date":"2025-06-06T09:06:01","date_gmt":"2025-06-06T01:06:01","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/42071.html"},"modified":"2025-06-06T09:06:01","modified_gmt":"2025-06-06T01:06:01","slug":"%e3%80%90c%e9%ab%98%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8webserver%e3%80%91-15%ef%bc%9apoll%e3%80%81epoll%e8%af%a6%e8%a7%a3%e5%8f%8a%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/42071.html","title":{"rendered":"\u3010C++\u9ad8\u5e76\u53d1\u670d\u52a1\u5668WebServer\u3011-15\uff1apoll\u3001epoll\u8be6\u89e3\u53ca\u5b9e\u73b0"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250606010558-68423ef6ef25a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <\/p>\n<h4>\u672c\u6587\u76ee\u5f55<\/h4>\n<ul>\n<li>\u4e00\u3001poll<\/li>\n<li>\u4e8c\u3001epoll<\/li>\n<li>\n<ul>\n<li>2.1 \u76f8\u5bf9poll\u548cselect\u7684\u4f18\u70b9<\/li>\n<li>2.2 epoll\u7684api<\/li>\n<li>2.3 epoll\u7684demo\u5b9e\u73b0<\/li>\n<li>2.5 epoll\u7684\u5de5\u4f5c\u6a21\u5f0f<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u4e00\u3001poll<\/h2>\n<p>poll\u662f\u5bf9select\u7684\u4e00\u4e2a\u6539\u8fdb&#xff0c;\u6211\u4eec\u5148\u6765\u770b\u770bselect\u7684\u7f3a\u70b9\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250606010559-68423ef750b08.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u6211\u4eec\u6765\u770b\u770bpoll\u7684\u5b9e\u73b0\u3002<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">pollfd<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/* \u59d4\u6258\u5185\u6838\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 *\/<\/span><br \/>\n<span class=\"token keyword\">short<\/span> events<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/* \u59d4\u6258\u5185\u6838\u68c0\u6d4b\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4ec0\u4e48\u4e8b\u4ef6 *\/<\/span><br \/>\n<span class=\"token keyword\">short<\/span> revents<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/* \u6587\u4ef6\u63cf\u8ff0\u7b26\u5b9e\u9645\u53d1\u751f\u7684\u4e8b\u4ef6 *\/<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">pollfd<\/span> myfd<span class=\"token punctuation\">;<\/span><br \/>\nmyfd<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmyfd<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> POLLIN <span class=\"token operator\">|<\/span> POLLOUT<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">poll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">pollfd<\/span> <span class=\"token operator\">*<\/span>fds<span class=\"token punctuation\">,<\/span> nfds_t nfds<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> timeout<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570\u8bf4\u660e\u5982\u4e0b\u3002 fds&#xff1a;\u662fstruct pollfd\u7ed3\u6784\u4f53\u6570\u7ec4&#xff0c;\u8fd9\u662f\u4e00\u4e2a\u9700\u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u3002<\/p>\n<p>\u5f53\u5185\u6838\u68c0\u6d4b\u5230\u6709\u53d8\u52a8\u4e4b\u540e&#xff0c;\u6709\u9700\u8981\u4fee\u6539\u7684&#xff0c;\u4f1a\u76f4\u63a5\u4fee\u6539revents&#xff0c;\u4e0d\u9700\u8981\u4fee\u6539events\u4e86&#xff0c;\u76f8\u5bf9select\u6765\u8bf4&#xff0c;\u5c31\u4e0d\u9700\u8981\u6bcf\u6b21\u91cd\u7f6efds\u96c6\u5408\u3002<\/p>\n<p>\u9664\u6b64\u4e4b\u5916&#xff0c;\u76f8\u5bf9\u4e8eselect\u6765\u8bf4&#xff0c;\u5e76\u6ca1\u67091024\u7684\u9650\u5236\u3002 nfds\u662f\u7b2c\u4e00\u4e2a\u53c2\u6570\u6570\u7ec4\u4e2d\u6700\u540e\u4e00\u4e2a\u6709\u6548\u5143\u7d20\u7684\u4e0b\u6807&#043;1\u3002<\/p>\n<p>timeout&#xff0c;\u6ce8\u610f\u8fd9\u4e2a\u662fint\u7c7b\u578b\u7684&#xff0c;\u5f53\u4e3a0\u65f6\u4ee3\u8868\u4e0d\u963b\u585e&#xff0c;\u5f53\u4e3a-1\u65f6\u8868\u793a\u963b\u585e&#xff0c;\u5f53\u68c0\u6d4b\u5230\u9700\u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u53d1\u751f\u4e86\u53d8\u5316&#xff0c;\u89e3\u9664\u963b\u585e\u3002&gt;0\u8868\u793a\u963b\u585e\u7684\u65f6\u957f\u3002<\/p>\n<p>poll\u51fd\u6570\u8fd4\u56de\u503c\u4e3a-1\u65f6\u8868\u793a\u5931\u8d25&#xff0c;&gt;0\u4f1a\u8fd4\u56den&#xff0c;\u8868\u793a\u68c0\u6d4b\u5230\u96c6\u5408\u4e2d\u6709n\u4e2a\u63cf\u8ff0\u7b26\u53d1\u751f\u4e86\u53d8\u5316\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250606010559-68423ef7a1054.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>poll\u7684\u670d\u52a1\u7aef\u5b9e\u73b0\u4ee3\u7801\u5982\u4e0b\u3002<\/p>\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;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;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;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;poll.h&gt;<\/span><\/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><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/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>PF_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> saddr<span class=\"token punctuation\">;<\/span><br \/>\n    saddr<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\">9999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> INADDR_ANY<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed1\u5b9a<\/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 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>saddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>saddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u76d1\u542c<\/span><br \/>\n    <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u7ec4<\/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 \/>\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> <span class=\"token number\">1024<\/span><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        fds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        fds<span class=\"token punctuation\">[<\/span>i<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    <span class=\"token punctuation\">}<\/span><br \/>\n    fds<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 \/>\n    <span class=\"token keyword\">int<\/span> nfds <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/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><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8c03\u7528poll\u7cfb\u7edf\u51fd\u6570&#xff0c;\u8ba9\u5185\u6838\u5e2e\u68c0\u6d4b\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u6709\u6570\u636e<\/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 operator\">&#043;<\/span> <span class=\"token number\">1<\/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><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#061;<\/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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;poll&#034;<\/span><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 operator\">&#8211;<\/span><span class=\"token number\">1<\/span><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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/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>ret <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 comment\">\/\/ \u8bf4\u660e\u68c0\u6d4b\u5230\u4e86\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5bf9\u5e94\u7684\u7f13\u51b2\u533a\u7684\u6570\u636e\u53d1\u751f\u4e86\u6539\u53d8<\/span><br \/>\n            <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\">\/\/ \u8868\u793a\u6709\u65b0\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\u8fdb\u6765\u4e86<\/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 keyword\">int<\/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> 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 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><\/p>\n<p>                <span class=\"token comment\">\/\/ \u5c06\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u52a0\u5165\u5230\u96c6\u5408\u4e2d<\/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\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">1024<\/span><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>fd <span class=\"token operator\">&#061;&#061;<\/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                        fds<span class=\"token punctuation\">[<\/span>i<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>i<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                        <span class=\"token keyword\">break<\/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 comment\">\/\/ \u66f4\u65b0\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u7d22\u5f15<\/span><br \/>\n                nfds <span class=\"token operator\">&#061;<\/span> nfds <span class=\"token operator\">&gt;<\/span> cfd <span class=\"token operator\">?<\/span> nfds <span class=\"token operator\">:<\/span> cfd<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;&#061;<\/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\">\/\/ \u8bf4\u660e\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u7684\u5ba2\u6237\u7aef\u53d1\u6765\u4e86\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 operator\">&#061;<\/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\">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\">&#061;&#061;<\/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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read&#034;<\/span><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 operator\">&#8211;<\/span><span class=\"token number\">1<\/span><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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;client closed&#8230;\\\\n&#034;<\/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 punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/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>len <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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read buf &#061; %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token function\">write<\/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 function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><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>        <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/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><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<p>\u5bf9\u5e94\u7684\u5ba2\u6237\u7aef\u4ee3\u7801\u6211\u4eec\u7ee7\u7eed\u6cbf\u7528\u4e4b\u524d\u7684\u5373\u53ef\u3002<\/p>\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;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;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;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;string.h&gt;<\/span><\/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><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>PF_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\">if<\/span><span class=\"token punctuation\">(<\/span>fd <span class=\"token operator\">&#061;&#061;<\/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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> seraddr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">inet_pton<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>seraddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    seraddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    seraddr<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\">9999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8fde\u63a5\u670d\u52a1\u5668<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>fd<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>seraddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>seraddr<span class=\"token punctuation\">)<\/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>ret <span class=\"token operator\">&#061;&#061;<\/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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;connect&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> num <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/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><br \/>\n        <span class=\"token keyword\">char<\/span> sendBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/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 function\">sprintf<\/span><span class=\"token punctuation\">(<\/span>sendBuf<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;send data %d&#034;<\/span><span class=\"token punctuation\">,<\/span> num<span class=\"token operator\">&#043;&#043;<\/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> sendBuf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>sendBuf<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u63a5\u6536<\/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> sendBuf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>sendBuf<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\">&#061;&#061;<\/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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/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>len <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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read buf &#061; %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> sendBuf<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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u5df2\u7ecf\u65ad\u5f00\u8fde\u63a5&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\">\/\/ sleep(1);<\/span><br \/>\n        <span class=\"token function\">usleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <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<h2>\u4e8c\u3001epoll<\/h2>\n<p>\u9996\u5148\u8c03\u7528epoll_create\u5b9e\u73b0\u4e00\u4e2aepoll\u7684\u5b9e\u4f8b&#xff0c;\u8fd9\u4e2aepoll\u5b9e\u4f8b\u662f\u5728\u5185\u6838\u533a&#xff0c;\u662f\u7ed3\u6784\u4f53\u7c7b\u578b&#xff0c;\u53ef\u4ee5\u7406\u89e3\u6210\u4e00\u5757\u6570\u636e\u3002\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u90a3\u6211\u4eec\u5c31\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u6765\u64cd\u4f5c\u8fd9\u5757\u5185\u6838\u5f53\u4e2d\u7684epoll\u6570\u636e&#xff08;\u901a\u8fc7epoll\u63d0\u4f9b\u7684\u4e00\u4e9bapi\u6765\u8fdb\u884c\u64cd\u4f5c&#xff09;\u3002<\/p>\n<p>eventpoll\u4e2d\u6709\u4e24\u4e2a\u6700\u5173\u952e\u7684\u6570\u636e&#xff0c;\u5c31\u662frbr\u548crdlist&#xff0c;\u4e5f\u5c31\u662f\u7ea2\u9ed1\u6811\u548c\u53cc\u5411\u5c31\u7eea\u94fe\u8868\u3002<\/p>\n<p>rbr\u8bb0\u5f55\u9700\u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002&#xff08;\u4e4b\u524d\u9700\u8981\u628a\u4e00\u4e9b\u8868\u4ece\u7528\u6237\u6001\u62f7\u8d1d\u5230\u5185\u6838\u6001&#xff0c;\u73b0\u5728\u662f\u76f4\u63a5\u5728\u5185\u6838\u6001&#xff0c;\u6548\u7387\u9ad8\u4e86\u5f88\u591a\u3002\u53e6\u5916\u73b0\u5728\u662f\u7ea2\u9ed1\u6811&#xff0c;\u4e4b\u524d\u662f\u94fe\u8868&#xff0c;\u7ea2\u9ed1\u6811\u7684\u904d\u5386\u6548\u7387\u4e5f\u9ad8\u5f88\u591a\u3002&#xff09;<\/p>\n<p>rdlist\u662f\u68c0\u6d4b\u6587\u4ef6\u63cf\u8ff0\u7b26\u5f53\u4e2d\u54ea\u4e9b\u662f\u6709\u6570\u636e\u53d1\u751f\u6539\u53d8\u7684\u3002<\/p>\n<p>\u5728\u51fd\u6570epoll_ctl(epfd,EPOLL_CTL_ADD,lfd,&amp;ev)\u4e2d\u6700\u540e\u4e00\u4e2a\u53c2\u6570ev\u662fstruct epoll_event\u7c7b\u578b&#xff0c;\u9700\u8981\u8bbe\u7f6eevents\u548cev.data.fd\u3002<\/p>\n<p>\u8c03\u7528epoll_wait\u4e4b\u540e\u5185\u6838\u5c31\u4f1a\u53bb\u68c0\u6d4brbr\u91cc\u9762\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u6709\u5bf9\u5e94\u7684\u6570\u636e\u6539\u53d8\u3002\u5982\u679c\u6709\u6539\u53d8\u7684&#xff08;\u5c31\u7eea\u7684&#xff09;&#xff0c;\u5c31\u4f1a\u628a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4fe1\u606f\u653e\u5230rdlist\u4e2d&#xff0c;\u7136\u540e\u4f1a\u628a\u8fd9\u4e2alist\u62f7\u8d1d\u5230\u7528\u6237\u533a&#xff0c;\u8fd9\u6837\u7528\u6237\u533a\u76f4\u63a5\u904d\u5386\u8fd9\u51e0\u4e2afd&#xff0c;\u5c31\u53ef\u4ee5\u8fdb\u884c\u5bf9\u5e94\u7684\u8bfb\u5199\u64cd\u4f5c\u4e86\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250606010559-68423ef7d2ffa.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>2.1 \u76f8\u5bf9poll\u548cselect\u7684\u4f18\u70b9<\/h3>\n<p>\u5728\u65f6\u95f4\u590d\u6742\u5ea6\u65b9\u9762&#xff0c;\u6bcf\u6b21\u8c03\u7528 select \u6216 poll \u65f6&#xff0c;\u5185\u6838\u9700\u8981\u904d\u5386\u6240\u6709\u88ab\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u68c0\u67e5\u5b83\u4eec\u7684\u72b6\u6001\u3002select \u548c poll \u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(n)\u3002\u5f53\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u5f88\u5927\u65f6&#xff08;\u4f8b\u5982\u6210\u5343\u4e0a\u4e07\u4e2a&#xff09;&#xff0c;\u8fd9\u79cd\u7ebf\u6027\u626b\u63cf\u7684\u6548\u7387\u4f1a\u975e\u5e38\u4f4e\u3002<\/p>\n<p>epoll \u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(1)&#xff0c;epoll \u4f7f\u7528\u7ea2\u9ed1\u6811\u548c\u53cc\u5411\u94fe\u8868\u6765\u7ba1\u7406\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u5f53\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u72b6\u6001\u53d1\u751f\u53d8\u5316\u65f6&#xff0c;\u5185\u6838\u4f1a\u5c06\u5176\u52a0\u5165\u5230\u5c31\u7eea\u94fe\u8868\u4e2d&#xff0c;\u7528\u6237\u7a0b\u5e8f\u53ea\u9700\u8981\u68c0\u67e5\u5c31\u7eea\u94fe\u8868\u5373\u53ef&#xff0c;\u800c\u4e0d\u9700\u8981\u904d\u5386\u6240\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n<p>\u5728\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u9650\u5236\u65b9\u9762&#xff0c;\u9ed8\u8ba4\u60c5\u51b5\u4e0b&#xff0c;select \u53ea\u80fd\u76d1\u63a7\u6700\u591a 1024 \u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;\u7531 FD_SETSIZE&#096;\u5b9a\u4e49&#xff09;\u3002\u5982\u679c\u9700\u8981\u76d1\u63a7\u66f4\u591a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u9700\u8981\u4fee\u6539\u5185\u6838\u53c2\u6570\u5e76\u91cd\u65b0\u7f16\u8bd1\u7a0b\u5e8f\u3002poll \u4f7f\u7528\u6570\u7ec4\u6765\u5b58\u50a8\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u7406\u8bba\u4e0a\u53ef\u4ee5\u76d1\u63a7\u4efb\u610f\u6570\u91cf\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u4f46\u5f53\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u5f88\u5927\u65f6&#xff0c;\u904d\u5386\u6574\u4e2a\u6570\u7ec4\u7684\u6548\u7387\u4f1a\u975e\u5e38\u4f4e\u3002<\/p>\n<p>epoll \u53ef\u4ee5\u8f7b\u677e\u652f\u6301\u6570\u4e07\u4e2a\u751a\u81f3\u66f4\u591a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u5b83\u4f7f\u7528\u7ea2\u9ed1\u6811\u6765\u5b58\u50a8\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u67e5\u627e\u548c\u63d2\u5165\u7684\u6548\u7387\u5f88\u9ad8\u3002<\/p>\n<p>\u5728 \u7528\u6237\u6001\u548c\u5185\u6838\u6001\u7684\u6570\u636e\u62f7\u8d1d\u65b9\u9762&#xff0c;\u6bcf\u6b21\u8c03\u7528 select \u6216 poll \u65f6&#xff0c;\u90fd\u9700\u8981\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4ece\u7528\u6237\u6001\u62f7\u8d1d\u5230\u5185\u6838\u6001&#xff1a;\u5f53\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u5f88\u5927\u65f6&#xff0c;\u8fd9\u79cd\u62f7\u8d1d\u64cd\u4f5c\u4f1a\u5e26\u6765\u8f83\u5927\u7684\u5f00\u9500\u3002<\/p>\n<p>\u5bf9\u4e8eepoll&#xff0c;\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ea\u9700\u8981\u901a\u8fc7 epoll_ctl \u6dfb\u52a0\u5230\u5185\u6838\u4e8b\u4ef6\u8868\u4e2d\u4e00\u6b21&#xff0c;\u540e\u7eed\u4e0d\u9700\u8981\u91cd\u590d\u62f7\u8d1d\u3002\u5f53\u6587\u4ef6\u63cf\u8ff0\u7b26\u72b6\u6001\u53d8\u5316\u65f6&#xff0c;\u5185\u6838\u4f1a\u76f4\u63a5\u5c06\u4e8b\u4ef6\u653e\u5165\u5c31\u7eea\u94fe\u8868\u4e2d&#xff0c;\u7528\u6237\u7a0b\u5e8f\u901a\u8fc7 epoll_wait \u83b7\u53d6\u5c31\u7eea\u4e8b\u4ef6\u3002<\/p>\n<p>\u5728 \u4e8b\u4ef6\u89e6\u53d1\u6a21\u5f0f\u65b9\u9762&#xff0c;select \u548c poll \u53ea\u652f\u6301\u6c34\u5e73\u89e6\u53d1&#xff08;Level-Triggered&#xff0c;LT&#xff09;\u6a21\u5f0f&#xff1a;\u5982\u679c\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u72b6\u6001\u6ee1\u8db3\u6761\u4ef6&#xff08;\u4f8b\u5982\u6709\u6570\u636e\u53ef\u8bfb&#xff09;&#xff0c;select \u548c poll \u4f1a\u4e00\u76f4\u901a\u77e5\u7528\u6237\u7a0b\u5e8f&#xff0c;\u76f4\u5230\u72b6\u6001\u53d1\u751f\u53d8\u5316\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250606010600-68423ef834793.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>epoll \u652f\u6301\u6c34\u5e73\u89e6\u53d1&#xff08;LT&#xff09;\u548c\u8fb9\u7f18\u89e6\u53d1&#xff08;Edge-Triggered&#xff0c;ET&#xff09;\u6a21\u5f0f&#xff1a; \u6c34\u5e73\u89e6\u53d1&#xff08;LT&#xff09;&#xff1a;\u4e0e select \u548c poll \u7684\u884c\u4e3a\u76f8\u540c&#xff0c;\u53ea\u8981\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u72b6\u6001\u6ee1\u8db3\u6761\u4ef6&#xff0c;\u5c31\u4f1a\u4e00\u76f4\u901a\u77e5\u7528\u6237\u7a0b\u5e8f\u3002\u8fb9\u7f18\u89e6\u53d1&#xff08;ET&#xff09;&#xff1a;\u53ea\u6709\u5f53\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u72b6\u6001\u53d1\u751f\u53d8\u5316\u65f6&#xff0c;\u624d\u4f1a\u901a\u77e5\u7528\u6237\u7a0b\u5e8f\u3002\u8fd9\u79cd\u6a21\u5f0f\u53ef\u4ee5\u51cf\u5c11\u91cd\u590d\u901a\u77e5\u7684\u6b21\u6570&#xff0c;\u63d0\u9ad8\u6548\u7387\u3002\u4f46\u662f\u9700\u8981\u7528\u6237\u7a0b\u5e8f\u4e00\u6b21\u6027\u5904\u7406\u5b8c\u6240\u6709\u6570\u636e&#xff0c;\u5426\u5219\u53ef\u80fd\u4f1a\u4e22\u5931\u6570\u636e\u3002<\/p>\n<p>\u5728\u5185\u6838\u5b9e\u73b0\u673a\u5236\u65b9\u9762&#xff0c;select \u548c poll \u662f\u57fa\u4e8e\u8f6e\u8be2\u7684\u673a\u5236&#xff1a;\u6bcf\u6b21\u8c03\u7528\u65f6&#xff0c;\u5185\u6838\u9700\u8981\u904d\u5386\u6240\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u68c0\u67e5\u5b83\u4eec\u7684\u72b6\u6001\u3002\u8fd9\u79cd\u673a\u5236\u5728\u5927\u89c4\u6a21\u5e76\u53d1\u573a\u666f\u4e0b\u6548\u7387\u8f83\u4f4e\u3002<\/p>\n<p>epoll \u662f\u57fa\u4e8e\u4e8b\u4ef6\u56de\u8c03\u7684\u673a\u5236&#xff1a;\u5185\u6838\u4f1a\u4e3a\u6bcf\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u6ce8\u518c\u56de\u8c03\u51fd\u6570&#xff0c;\u5f53\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u72b6\u6001\u53d1\u751f\u53d8\u5316\u65f6&#xff0c;\u5185\u6838\u4f1a\u8c03\u7528\u56de\u8c03\u51fd\u6570\u5c06\u5176\u52a0\u5165\u5230\u5c31\u7eea\u94fe\u8868\u4e2d\u3002\u8fd9\u79cd\u673a\u5236\u907f\u514d\u4e86\u4e0d\u5fc5\u8981\u7684\u904d\u5386&#xff0c;\u6548\u7387\u66f4\u9ad8\u3002<\/p>\n<h3>2.2 epoll\u7684api<\/h3>\n<p>\u5934\u6587\u4ef6\u5982\u4e0b\u3002<\/p>\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>\/\u521b\u5efa\u4e00\u4e2a\u65b0\u7684epoll\u5b9e\u4f8b\u3002\u5728\u5185\u6838\u4e2d\u521b\u5efa\u4e86\u4e00\u4e2a\u6570\u636e&#xff0c;\u8fd9\u4e2a\u6570\u636e\u4e2d\u6709\u4e24\u4e2a\u6bd4\u8f83\u91cd\u8981\u7684\u6570\u636e&#xff0c;\u4e00\u4e2a\u662f\u9700\u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4fe1\u606f&#xff08;\u7ea2\u9ed1\u6811&#xff09;&#xff0c;\u8fd8\u6709\u4e00\u4e2a\u662f\u5c31\u7eea\u5217\u8868&#xff0c;\u5b58\u653e\u68c0\u6d4b\u5230\u6570\u636e\u53d1\u9001\u6539\u53d8\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4fe1\u606f&#xff08;\u53cc\u5411\u94fe\u8868&#xff09;\u3002\u3010\u4ecelinux\u5185\u68382.6.8\u5f00\u59cb&#xff0c;size\u8fd9\u4e2a\u53c2\u6570\u5df2\u7ecf\u88ab\u5ffd\u7565\u4e86&#xff0c;\u4f46\u662f\u5fc5\u987b\u5927\u4e8e0\u3002\u3011<\/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><br \/>\n<span class=\"token operator\">&#8211;<\/span> \u53c2\u6570&#xff1a;<br \/>\nsize <span class=\"token operator\">:<\/span> \u76ee\u524d\u6ca1\u6709\u610f\u4e49\u4e86\u3002\u968f\u4fbf\u5199\u4e00\u4e2a\u6570&#xff0c;\u5fc5\u987b\u5927\u4e8e<span class=\"token number\">0<\/span><br \/>\n<span class=\"token operator\">&#8211;<\/span> \u8fd4\u56de\u503c&#xff1a;<br \/>\n<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">:<\/span> \u5931\u8d25<br \/>\n<span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">:<\/span> \u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u64cd\u4f5cepoll\u5b9e\u4f8b\u7684<\/p>\n<p>\u5bf9epoll\u5b9e\u4f8b\u8fdb\u884c\u7ba1\u7406&#xff1a;\u6dfb\u52a0\u6587\u4ef6\u63cf\u8ff0\u7b26\u4fe1\u606f&#xff0c;\u5220\u9664\u4fe1\u606f&#xff0c;\u4fee\u6539\u4fe1\u606f<\/p>\n<p><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><br \/>\n<span class=\"token operator\">&#8211;<\/span> \u53c2\u6570&#xff1a;<br \/>\n<span class=\"token operator\">&#8211;<\/span> epfd <span class=\"token operator\">:<\/span> epoll\u5b9e\u4f8b\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<br \/>\n<span class=\"token operator\">&#8211;<\/span> op <span class=\"token operator\">:<\/span> \u8981\u8fdb\u884c\u4ec0\u4e48\u64cd\u4f5c<br \/>\nEPOLL_CTL_ADD<span class=\"token operator\">:<\/span> \u6dfb\u52a0<br \/>\nEPOLL_CTL_MOD<span class=\"token operator\">:<\/span> \u4fee\u6539&#xff08;\u6bd4\u5982\u4ece\u8bfb\u4e8b\u4ef6\u6539\u6210\u5199\u4e8b\u4ef6&#xff09;<br \/>\nEPOLL_CTL_DEL<span class=\"token operator\">:<\/span> \u5220\u9664<br \/>\n<span class=\"token operator\">&#8211;<\/span> fd <span class=\"token operator\">:<\/span> \u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<br \/>\n<span class=\"token operator\">&#8211;<\/span> event <span class=\"token operator\">:<\/span> \u68c0\u6d4b\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ec0\u4e48\u4e8b\u60c5<\/p>\n<p>epoll_event\u662f\u68c0\u6d4b\u4e8b\u4ef6\u7684\u7ed3\u6784\u4f53&#xff0c;\u5b9a\u4e49\u5982\u4e0b\u3002<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">uint32_t<\/span> events<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/* Epoll events *\/<\/span><br \/>\nepoll_data_t data<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/* User data variable *\/<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n\u5e38\u89c1\u7684Epoll\u68c0\u6d4b\u4e8b\u4ef6&#xff1a;<br \/>\n<span class=\"token operator\">&#8211;<\/span> EPOLLIN<br \/>\n<span class=\"token operator\">&#8211;<\/span> EPOLLOUT<br \/>\n<span class=\"token operator\">&#8211;<\/span> EPOLLERR<br \/>\n<span class=\"token operator\">&#8211;<\/span> EPOLLET &#xff08;\u8bbe\u7f6e\u8fb9\u6cbf\u89e6\u53d1&#xff09;<\/p>\n<p>\u5728\u5176\u4e2d&#xff0c;\u53c8\u6709\u4e00\u4e2a\u8054\u5408\u4f53epoll_data_t&#xff0c;\u5b9a\u4e49\u5982\u4e0b\u3002\u901a\u8fc7\u8054\u5408\u4f53&#xff0c;\u7528\u6237\u53ef\u4ee5\u9009\u62e9\u5b58\u50a8\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e&#xff0c;\u5982\u6307\u9488\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u300132 \u4f4d\u6216 64 \u4f4d\u6574\u6570\u3002<\/p>\n<p>ptr\u662f\u4e00\u4e2a\u6307\u5411\u4efb\u610f\u7c7b\u578b\u7684\u6307\u9488\u3002\u7528\u6237\u53ef\u4ee5\u5c06\u4e0e\u4e8b\u4ef6\u76f8\u5173\u7684\u4efb\u610f\u6570\u636e\u5b58\u50a8\u5728\u8fd9\u4e2a\u6307\u9488\u4e2d&#xff0c;\u4f8b\u5982\u6307\u5411\u67d0\u4e2a\u7ed3\u6784\u4f53\u7684\u6307\u9488\u3002\u8fd9\u79cd\u65b9\u5f0f\u975e\u5e38\u7075\u6d3b&#xff0c;\u53ef\u4ee5\u5b58\u50a8\u7528\u6237\u81ea\u5b9a\u4e49\u7684\u6570\u636e\u7ed3\u6784\u3002 fd&#xff0c;\u8fd9\u662f epoll \u6700\u5e38\u7528\u7684\u7528\u9014\u4e4b\u4e00&#xff0c;\u76f4\u63a5\u5b58\u50a8\u4e0e\u4e8b\u4ef6\u76f8\u5173\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002 u32\u662f\u4e00\u4e2a 32 \u4f4d\u7684\u65e0\u7b26\u53f7\u6574\u6570\u3002\u7528\u6237\u53ef\u4ee5\u5b58\u50a8\u4e00\u4e9b\u7b80\u5355\u7684\u6574\u6570\u503c\u4f5c\u4e3a\u7528\u6237\u6570\u636e\u3002u64\u540c\u7406\u3002<\/p>\n<p>\u8054\u5408\u4f53 epoll_data_t \u7684\u8bbe\u8ba1\u5141\u8bb8\u7528\u6237\u6839\u636e\u9700\u8981\u9009\u62e9\u5b58\u50a8\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\u3002\u8054\u5408\u4f53\u7684\u7279\u6027\u662f\u6240\u6709\u6210\u5458\u5171\u4eab\u540c\u4e00\u5757\u5185\u5b58&#xff0c;\u56e0\u6b64\u5728\u4efb\u4f55\u65f6\u523b&#xff0c;\u8054\u5408\u4f53\u4e2d\u53ea\u6709\u4e00\u4e2a\u6210\u5458\u662f\u6709\u6548\u7684\u3002\u7528\u6237\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u9700\u6c42\u9009\u62e9\u5b58\u50a8\u54ea\u79cd\u7c7b\u578b\u7684\u6570\u636e\u3002<\/p>\n<p><span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">union<\/span> epoll_data <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>ptr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">uint32_t<\/span> u32<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">uint64_t<\/span> u64<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> epoll_data_t<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u68c0\u6d4b\u51fd\u6570\u5982\u4e0b\u3002<\/p>\n<p><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> inttimeout<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#8211;<\/span> \u53c2\u6570&#xff1a;<br \/>\n<span class=\"token operator\">&#8211;<\/span> epfd <span class=\"token operator\">:<\/span> epoll\u5b9e\u4f8b\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<br \/>\n<span class=\"token operator\">&#8211;<\/span> events <span class=\"token operator\">:<\/span> \u4f20\u51fa\u53c2\u6570&#xff0c;\u4fdd\u5b58\u4e86\u53d1\u9001\u4e86\u53d8\u5316\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4fe1\u606f<br \/>\n<span class=\"token operator\">&#8211;<\/span> maxevents <span class=\"token operator\">:<\/span> \u7b2c\u4e8c\u4e2a\u53c2\u6570\u7ed3\u6784\u4f53\u6570\u7ec4\u7684\u5927\u5c0f<br \/>\n<span class=\"token operator\">&#8211;<\/span> timeout <span class=\"token operator\">:<\/span> \u963b\u585e\u65f6\u95f4<br \/>\n<span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">:<\/span> \u4e0d\u963b\u585e<br \/>\n<span class=\"token operator\">&#8211;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">:<\/span> \u963b\u585e&#xff0c;\u76f4\u5230\u68c0\u6d4b\u5230fd\u6570\u636e\u53d1\u751f\u53d8\u5316&#xff0c;\u89e3\u9664\u963b\u585e<br \/>\n<span class=\"token operator\">&#8211;<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">:<\/span> \u963b\u585e\u7684\u65f6\u957f&#xff08;\u6beb\u79d2&#xff09;<br \/>\n<span class=\"token operator\">&#8211;<\/span> \u8fd4\u56de\u503c&#xff1a;<br \/>\n<span class=\"token operator\">&#8211;<\/span> \u6210\u529f&#xff0c;\u8fd4\u56de\u53d1\u9001\u53d8\u5316\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e2a\u6570 <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><br \/>\n<span class=\"token operator\">&#8211;<\/span> \u5931\u8d25 <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><\/p>\n<p>\u8fd9\u91cc\u6709\u4e2a\u95ee\u9898\u662f&#xff0c;\u5728\u4f7f\u7528 epoll \u65f6&#xff0c;epoll_ctl \u51fd\u6570\u786e\u5b9e\u5df2\u7ecf\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;fd&#xff09;\u6ce8\u518c\u5230\u4e86 epoll \u5b9e\u4f8b\u4e2d&#xff0c;\u4f46 epoll_event \u7ed3\u6784\u4f53\u4e2d\u7684 data.fd \u4ecd\u7136\u9700\u8981\u5b58\u50a8\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u539f\u56e0\u4e3b\u8981\u6709\u4ee5\u4e0b\u51e0\u70b9&#xff1a;<\/p>\n<p>\u9996\u5148epoll_ctl\u662f\u7528\u4e8e\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u6ce8\u518c\u5230 epoll \u5b9e\u4f8b\u4e2d&#xff0c;\u5e76\u8bbe\u7f6e\u76f8\u5173\u7684\u4e8b\u4ef6\u7c7b\u578b&#xff08;\u5982 EPOLLIN\u3001EPOLLOUT \u7b49&#xff09;\u3002\u5b83\u7684\u4f5c\u7528\u662f\u544a\u8bc9 epoll \u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u9700\u8981\u88ab\u76d1\u63a7&#xff0c;\u4ee5\u53ca\u76d1\u63a7\u54ea\u4e9b\u7c7b\u578b\u7684\u4e8b\u4ef6\u3002<\/p>\n<p>\u800cepoll_event \u4e2d \u7528\u4e8e\u5728 epoll_wait \u8c03\u7528\u65f6\u8fd4\u56de\u68c0\u6d4b\u5230\u7684\u4e8b\u4ef6\u3002 \u5b83\u7684\u4f5c\u7528\u662f\u544a\u8bc9\u7528\u6237\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u53d1\u751f\u4e86\u4e8b\u4ef6&#xff0c;\u4ee5\u53ca\u53d1\u751f\u4e86\u54ea\u4e9b\u7c7b\u578b\u7684\u4e8b\u4ef6\u3002epoll_event \u4e2d\u7684 data.fd \u662f\u4e3a\u4e86\u65b9\u4fbf\u7528\u6237\u5728 epoll_wait \u8fd4\u56de\u540e&#xff0c;\u80fd\u591f\u76f4\u63a5\u83b7\u53d6\u5230\u53d1\u751f\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n<p>\u5f53 epoll_wait \u8fd4\u56de\u65f6&#xff0c;\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2a epoll_event \u6570\u7ec4&#xff0c;\u6bcf\u4e2a epoll_event \u8868\u793a\u4e00\u4e2a\u53d1\u751f\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ca\u5176\u4e8b\u4ef6\u7c7b\u578b\u3002\u901a\u8fc7\u5728 epoll_event \u4e2d\u5b58\u50a8 fd&#xff0c;\u7528\u6237\u53ef\u4ee5\u76f4\u63a5\u4ece epoll_event \u4e2d\u83b7\u53d6\u5230\u53d1\u751f\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u800c\u65e0\u9700\u989d\u5916\u67e5\u627e\u3002<\/p>\n<h3>2.3 epoll\u7684demo\u5b9e\u73b0<\/h3>\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;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;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;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;sys\/epoll.h&gt;<\/span><\/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><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/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>PF_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> saddr<span class=\"token punctuation\">;<\/span><br \/>\n    saddr<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\">9999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> INADDR_ANY<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed1\u5b9a<\/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 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>saddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>saddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u76d1\u542c<\/span><br \/>\n    <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8c03\u7528epoll_create()\u521b\u5efa\u4e00\u4e2aepoll\u5b9e\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\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5c06\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u76f8\u5173\u7684\u68c0\u6d4b\u4fe1\u606f\u6dfb\u52a0\u5230epoll\u5b9e\u4f8b\u4e2d<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> epev<span class=\"token punctuation\">;<\/span><br \/>\n    epev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> EPOLLIN<span class=\"token punctuation\">;<\/span><br \/>\n    epev<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>epev<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> epevs<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><\/p>\n<p>        <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_wait<\/span><span class=\"token punctuation\">(<\/span>epfd<span class=\"token punctuation\">,<\/span> epevs<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><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#061;<\/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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_wait&#034;<\/span><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 operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ret &#061; %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> ret<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> ret<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>            <span class=\"token keyword\">int<\/span> curfd <span class=\"token operator\">&#061;<\/span> epevs<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><\/p>\n<p>            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>curfd <span class=\"token operator\">&#061;&#061;<\/span> lfd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6709\u6570\u636e\u8fbe\u5230&#xff0c;\u6709\u5ba2\u6237\u7aef\u8fde\u63a5<\/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 keyword\">int<\/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> 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 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><\/p>\n<p>                epev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> EPOLLIN <span class=\"token operator\">|<\/span> EPOLLOUT<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u76d1\u542c\u7684\u4e8b\u4ef6\u6bd4\u8f83\u591a&#xff0c;\u6240\u4ee5\u6bcf\u4e00\u79cd\u4e8b\u4ef6\u5728\u4e0b\u65b9\u90fd\u9700\u8981\u8fdb\u884c\u5bf9\u5e94\u7684\u5904\u7406\u3002<\/span><br \/>\n                epev<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>epev<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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>epevs<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&amp;<\/span> EPOLLOUT<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u6709\u6570\u636e\u5230\u8fbe&#xff0c;\u9700\u8981\u901a\u4fe1<\/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 operator\">&#061;<\/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\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>curfd<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\">&#061;&#061;<\/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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read&#034;<\/span><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 operator\">&#8211;<\/span><span class=\"token number\">1<\/span><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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;client closed&#8230;\\\\n&#034;<\/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> curfd<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>curfd<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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read buf &#061; %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>curfd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>epfd<span class=\"token punctuation\">)<\/span><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<h3>2.5 epoll\u7684\u5de5\u4f5c\u6a21\u5f0f<\/h3>\n<p>epoll \u6709\u4e24\u79cd\u5de5\u4f5c\u6a21\u5f0f&#xff1a;LT&#xff08;\u6c34\u5e73\u89e6\u53d1&#xff09;\u6a21\u5f0f\u548c ET&#xff08;\u8fb9\u6cbf\u89e6\u53d1&#xff09;\u6a21\u5f0f\u3002\u5728 LT \u6a21\u5f0f\u4e2d&#xff0c;\u5f53\u5185\u6838\u68c0\u6d4b\u5230\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;fd&#xff09;\u7684\u8bfb\u7f13\u51b2\u533a\u4e2d\u6709\u6570\u636e\u65f6&#xff0c;\u4f1a\u901a\u77e5\u7528\u6237\u3002\u5982\u679c\u7528\u6237\u6ca1\u6709\u8bfb\u53d6\u6570\u636e&#xff0c;\u6570\u636e\u4f1a\u4e00\u76f4\u4fdd\u7559\u5728\u7f13\u51b2\u533a\u4e2d&#xff0c;epoll \u4f1a\u6301\u7eed\u901a\u77e5\u7528\u6237\u3002\u5373\u4f7f\u7528\u6237\u53ea\u8bfb\u53d6\u4e86\u4e00\u90e8\u5206\u6570\u636e&#xff0c;epoll \u4e5f\u4f1a\u7ee7\u7eed\u901a\u77e5&#xff0c;\u76f4\u5230\u7f13\u51b2\u533a\u7684\u6570\u636e\u88ab\u5b8c\u5168\u8bfb\u8d70\u3002LT \u6a21\u5f0f\u540c\u65f6\u652f\u6301\u963b\u585e&#xff08;block&#xff09;\u548c\u975e\u963b\u585e&#xff08;non-block&#xff09;\u7684 socket&#xff0c;\u5b83\u662f\u4e00\u79cd\u7f3a\u7701\u7684\u5de5\u4f5c\u65b9\u5f0f&#xff0c;\u5185\u6838\u4f1a\u6301\u7eed\u544a\u77e5\u7528\u6237\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u5c31\u7eea&#xff0c;\u5e76\u5141\u8bb8\u7528\u6237\u5bf9\u8fd9\u4e2a\u5c31\u7eea\u7684 fd \u8fdb\u884c I\/O \u64cd\u4f5c\u3002\u5982\u679c\u7528\u6237\u4e0d\u8fdb\u884c\u4efb\u4f55\u64cd\u4f5c&#xff0c;\u5185\u6838\u4f1a\u7ee7\u7eed\u53d1\u9001\u901a\u77e5\u3002<\/p>\n<p>\u76f8\u6bd4\u4e4b\u4e0b&#xff0c;ET \u6a21\u5f0f\u662f\u4e00\u79cd\u9ad8\u901f\u5de5\u4f5c\u65b9\u5f0f&#xff0c;\u4ec5\u652f\u6301\u975e\u963b\u585e socket\u3002\u5728\u8fd9\u79cd\u6a21\u5f0f\u4e0b&#xff0c;\u5185\u6838\u4ec5\u5728\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ece\u672a\u5c31\u7eea\u53d8\u4e3a\u5c31\u7eea\u65f6\u901a\u8fc7 epoll \u901a\u77e5\u7528\u6237\u4e00\u6b21\u3002\u4e00\u65e6\u901a\u77e5&#xff0c;\u5185\u6838\u4f1a\u5047\u5b9a\u7528\u6237\u77e5\u9053\u6587\u4ef6\u63cf\u8ff0\u7b26\u5df2\u7ecf\u5c31\u7eea&#xff0c;\u5e76\u4e14\u4e0d\u4f1a\u518d\u4e3a\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u53d1\u9001\u66f4\u591a\u7684\u5c31\u7eea\u901a\u77e5&#xff0c;\u9664\u975e\u7528\u6237\u6267\u884c\u4e86\u67d0\u4e9b\u64cd\u4f5c\u5bfc\u81f4\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0d\u518d\u5904\u4e8e\u5c31\u7eea\u72b6\u6001\u3002\u5728 ET \u6a21\u5f0f\u4e2d&#xff0c;\u5982\u679c\u7528\u6237\u4e0d\u5bf9 fd \u6267\u884c I\/O \u64cd\u4f5c&#xff0c;\u4ece\u800c\u4f7f\u5f97\u5b83\u518d\u6b21\u53d8\u4e3a\u672a\u5c31\u7eea\u72b6\u6001&#xff0c;\u5185\u6838\u4e0d\u4f1a\u518d\u6b21\u53d1\u9001\u901a\u77e5\u3002\u8fd9\u79cd\u6a21\u5f0f\u663e\u8457\u51cf\u5c11\u4e86 epoll \u4e8b\u4ef6\u88ab\u91cd\u590d\u89e6\u53d1\u7684\u6b21\u6570&#xff0c;\u56e0\u6b64\u6bd4 LT \u6a21\u5f0f\u66f4\u9ad8\u6548\u3002\u5728 ET \u6a21\u5f0f\u4e0b\u5de5\u4f5c\u65f6&#xff0c;\u5fc5\u987b\u4f7f\u7528\u975e\u963b\u585e\u5957\u63a5\u5b57&#xff0c;\u4ee5\u907f\u514d\u7531\u4e8e\u5355\u4e2a\u6587\u4ef6\u53e5\u67c4\u7684\u963b\u585e\u8bfb\/\u5199\u64cd\u4f5c\u5bfc\u81f4\u5904\u7406\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4efb\u52a1\u997f\u6b7b\u3002<\/p>\n<p>\u9700\u8981\u7279\u522b\u6ce8\u610f\u7684\u662f&#xff0c;ET\u6a21\u5f0f\u4e2d&#xff0c;\u5982\u679c\u7528\u6237\u4e0d\u8bfb\u6570\u636e&#xff0c;\u6570\u636e\u4e00\u76f4\u5728\u7f13\u51b2\u533a\u4e2d&#xff0c;epoll\u4e0b\u6b21\u68c0\u6d4b\u7684\u65f6\u5019\u5c31\u4e0d\u4f1a\u518d\u901a\u77e5\u4e86\u3002<\/p>\n<p>\u5982\u679c\u4f7f\u7528\u4e86ET\u6a21\u5f0f&#xff0c;\u90a3\u4e48\u5728\u76d1\u542c\u5230\u6709\u5ba2\u6237\u7aef\u8fde\u63a5\u4e4b\u540e&#xff0c;\u5bf9cfd\u7684\u5c5e\u6027\u9700\u8981\u8bbe\u7f6e\u975e\u963b\u585e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb5.2k\u6b21\uff0c\u70b9\u8d5e12\u6b21\uff0c\u6536\u85cf15\u6b21\u3002\u672c\u6587\u4e3b\u8981\u4ecb\u7ecd\u4e86poll\u548cepoll\u7684\u5b9e\u73b0\uff0c\u5176\u4e2d\u91cd\u70b9\u5206\u6790\u4e86epoll\u7684\u51fd\u6570\u3001\u5de5\u4f5c\u6a21\u5f0f\u7b49\u3002_c++ poll epoll<\/p>\n","protected":false},"author":2,"featured_media":42066,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[251,55,3884,58,43],"topic":[],"class_list":["post-42071","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-webserver","tag-c","tag-epoll","tag-linux","tag-43"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010C++\u9ad8\u5e76\u53d1\u670d\u52a1\u5668WebServer\u3011-15\uff1apoll\u3001epoll\u8be6\u89e3\u53ca\u5b9e\u73b0 - \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\/42071.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta 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