{"id":57095,"date":"2025-08-15T07:49:33","date_gmt":"2025-08-14T23:49:33","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/57095.html"},"modified":"2025-08-15T07:49:33","modified_gmt":"2025-08-14T23:49:33","slug":"io%e5%a4%9a%e8%b7%af%e8%bd%ac%e6%8e%a5%e4%b9%8bpoll","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/57095.html","title":{"rendered":"IO\u591a\u8def\u8f6c\u63a5\u4e4bpoll"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>poll\u521d\u59cb<\/li>\n<li>poll\u51fd\u6570\u63a5\u53e3<\/li>\n<li>poll\u670d\u52a1\u5668<\/li>\n<li>\n<ul>\n<li>PollServer.hpp<\/li>\n<\/ul>\n<\/li>\n<li>poll\u7684\u4f18\u70b9\u7f3a\u70b9<\/li>\n<\/ul>\n<h2>poll\u521d\u59cb<\/h2>\n<p>poll\u4e5f\u662f\u4e00\u79cdlinux\u4e2d\u591a\u8def\u8f6c\u63a5\u7684\u65b9\u6848\u3002\u5b83\u6240\u5bf9\u5e94\u7684\u591a\u8def\u8f6c\u63a5\u65b9\u6848\u4e3b\u8981\u662f\u89e3\u51b3select\u4e24\u4e2a\u95ee\u9898\u3002<\/p>\n<p>select\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6709\u4e0a\u9650\u7684\u95ee\u9898<\/p>\n<p>select\u6bcf\u6b21\u90fd\u8981\u91cd\u65b0\u8bbe\u7f6e\u5173\u5fc3\u7684fd<\/p>\n<p>\u4e0b\u9762\u901a\u8fc7poll\u63a5\u53e3\u6765\u8ba4\u8bc6\u5b83\u662f\u600e\u4e48\u89e3\u51b3select\u7684\u95ee\u9898\u7684\u3002<\/p>\n<h2>poll\u51fd\u6570\u63a5\u53e3<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250814234931-689e760b111bd.png\" alt=\"\" \/><\/p>\n<p>struct pollfd * fds&#xff1a;\u8fd9\u91cc\u53ef\u4ee5\u628a\u5b83\u60f3\u8c61\u4e00\u4e2a\u52a8\u6001\u6570\u7ec4\u3001\u6570\u7ec4\u6216\u8005new\/malloc\u51fa\u6765\u7684\u7ed3\u6784\u4f53\u6570\u7ec4<\/p>\n<p>nfds_t nfds&#xff1a;\u4ee3\u8868\u8fd9\u4e2a\u6570\u7ec4\u7684\u957f\u5ea6<\/p>\n<p>int timeout&#xff1a;\u7eaf\u8f93\u5165\u578b&#xff0c;\u65f6\u95f4\u5355\u4f4dms<\/p>\n<p>\u5927\u4e8e0&#xff1a;\u5728timeout\u4ee5\u5185 \u963b\u585e&#xff0c;\u8d85\u8fc7timeout\u975e\u963b\u585e\u8fd4\u56de\u4e00\u6b21<\/p>\n<p>\u7b49\u4e8e0 &#xff1a;\u975e\u963b\u585e<\/p>\n<p>\u5c0f\u4e8e&lt;0&#xff1a;\u963b\u585e<\/p>\n<p>\u8fd9\u4e2a\u548cselect\u4e00\u6a21\u4e00\u6837\u7684\u610f\u601d\u3002\u7528\u8d77\u6765\u66f4\u7b80\u5355\u4e86\u3002<\/p>\n<p>\u8fd4\u56de\u503c&#xff1a;\u540cselect\u4e00\u6a21\u4e00\u6837<\/p>\n<p>\u5927\u4e8e0&#xff1a;\u8868\u793a\u6709\u51e0\u4e2afd\u5c31\u7eea\u4e86<\/p>\n<p>\u7b49\u4e8e0&#xff1a;\u8868\u793a\u8d85\u65f6\u4e86<\/p>\n<p>\u5c0f\u4e8e0&#xff1a;\u8868\u793apoll\u7b49\u5f85\u5931\u8d25\u4e86<\/p>\n<p>poll\u7684\u4f5c\u7528\u548cselect\u4e00\u6a21\u4e00\u6837&#xff1a;\u53ea\u8d1f\u8d23\u7b49\u5f85&#xff01;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250814234931-689e760ba9477.png\" alt=\"\" \/><\/p>\n<p>\u8fd9\u4e2astruct pollfd\u7ed3\u6784\u4f53 \u5728\u4f20\u7ed9poll\u8868\u793a \u7528\u6237-&gt;\u5185\u6838&#xff1a;<\/p>\n<p>int fd&#xff1a;\u4f60\u8981\u5173\u5fc3\u4e00\u4e0b\u8fd9\u4e2afd\u54e6<\/p>\n<p>short events&#xff1a;\u5173\u5fc3\u7684\u662f\u8fd9\u4e2afd\u7684\u4ec0\u4e48\u4e8b\u4ef6\u3002\u6211\u4eec\u628a\u5bf9\u5e94\u7684\u4e8b\u4ef6\u8bbe\u7f6e\u8fdbevents\u91cc<\/p>\n<p>\u8f93\u5165\u770b&#xff1a;fd&#043;events<\/p>\n<p>\u5f53poll\u8fd4\u56de\u65f6\u8fd9\u4e2astruct pollfd\u7ed3\u6784\u4f53 \u8868\u793a\u5185\u6838-&gt;\u7528\u6237&#xff1a;<\/p>\n<p>\u4f60\u8981\u5173\u5fc3\u7684fd\u4e0a\u9762\u7684events\u4e2d\u6709\u90a3\u4e9b\u4e8b\u4ef6\u5df2\u7ecf\u5c31\u7eea\u5566<\/p>\n<p>short revents&#xff1a;\u5c31\u7eea\u4e8b\u4ef6\u7531revents\u8fd4\u56de<\/p>\n<p>\u8f93\u51fa\u770b&#xff1a;fd&#043;revents<\/p>\n<p>\u5f88\u663e\u7136\u8fd9\u79cd\u8bbe\u8ba1\u89e3\u51b3\u4e86\u8fd9\u6837\u7684\u95ee\u9898&#xff1a;<\/p>\n<p>\u8f93\u5165\u8f93\u51fa\u5206\u79bb&#xff01;<\/p>\n<p>\u73b0\u5728&#xff0c;\u7528\u6237-&gt;\u5185\u6838&#xff0c;\u5185\u6838-&gt;\u7528\u6237&#xff0c;events\u548crevents\u7684\u5206\u79bb&#xff01;\u4ee5\u524dselect\u5c31\u7528\u4e00\u5f20\u4f4d\u56fe\u8868\u793a\u4e0d\u540c\u542b\u4e49&#xff0c;\u56e0\u4e3a\u8f93\u5165\u8f93\u51fa\u5206\u79bb\u4e86\u6240\u4ee5\u51b3\u5b9a\u4e86poll\u4e0d\u9700\u8981\u5bf9\u53c2\u6570\u8fdb\u884c\u91cd\u65b0\u8bbe\u5b9a<\/p>\n<p>events\u548crevents\u7c7b\u578b\u662f\u6574\u6570&#xff0c;\u5bf9\u5e94\u7684\u4e8b\u4ef6\u5982\u4e0b&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250814234931-689e760be45dc.png\" alt=\"\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250814234932-689e760c32561.png\" alt=\"\" \/><\/p>\n<p>\u5176\u4e2d\u5bf9\u6211\u4eec\u6765\u8bf4\u5e38\u7528\u7684\u662fPOLLIN\u3001POLLOUT\u3001POLLERR&#xff0c;\u8fd9\u4e9b\u90fd\u662f\u5927\u5199\u7684\u5b8f\u6bcf\u4e00\u4e2a\u5360\u4e00\u4e2a\u6bd4\u7279\u4f4d&#xff0c;\u4e0d\u540c\u6bd4\u7279\u4f4d\u8868\u793a\u4e0d\u540c\u4e8b\u4ef6\u3002<\/p>\n<p>\u6240\u4ee5\u7528\u6237-&gt;\u5185\u6838&#xff0c;\u53ea\u8981\u5c06events\u8bbe\u7f6e\u6210\u8981\u5173\u5fc3\u7684\u5b8f\u503c&#xff0c;\u90a3\u4e48\u64cd\u4f5c\u7cfb\u7edf\u5c31\u5e2e\u6211\u4eec\u8fdb\u884c\u5173\u5fc3\u4e86\u3002\u5f53\u64cd\u4f5c\u7cfb\u7edf\u8fd4\u56de\u65f6\u53ea\u8981\u628arevents\u8bbe\u7f6e\u6210\u5bf9\u5e94\u7684\u5b8f\u503c&#xff0c;\u4e0d\u5c31\u628a\u90a3\u4e9b\u4e8b\u4ef6\u5c31\u7eea\u4e0d\u5c31\u544a\u8bc9\u6211\u4eec\u4e86\u5417\u3002<\/p>\n<p>\u56e0\u4e3a\u5b83\u7684\u7c7b\u578b\u662fshort\u800c\u6ca1\u6709\u7528\u64cd\u4f5c\u7cfb\u7edf\u81ea\u5df1\u5c01\u88c5\u7684\u5404\u79cd\u5404\u6837\u7684\u7ed3\u6784\u4f53&#xff0c;\u6240\u4ee5\u5bf9\u4e8e\u4e8b\u4ef6\u7684\u8bbe\u8ba1&#xff0c;\u6211\u4eec\u81ea\u5df1\u7528\u6237\u68c0\u6d4b\u4e8b\u4ef6\u6709\u6ca1\u6709\u8bbe\u7f6e\u6216\u8005\u5c31\u7eea\u4e00\u5b9a\u8981\u7531\u6211\u4eec\u81ea\u5df1\u6765\u505a&#xff0c;\u6309\u4f4d\u4e0e&#xff0c;\u6309\u4f4d\u6216\u8fd9\u6837\u7684\u64cd\u4f5c\u3002<\/p>\n<p>select\u7b49\u5f85fd\u6709\u4e0a\u9650\u7684\u95ee\u9898<\/p>\n<p>struct pollfd *fds\u4e0d\u662f\u4e00\u4e2a\u6570\u7ec4\u5417&#xff0c;nfds_t nfds\u4e0d\u5c31\u662f\u8be5\u6570\u7ec4\u5927\u5c0f\u4e5f\u5c31\u662f\u4e0a\u9650\u5417&#xff0c;\u4f60\u600e\u4e48\u8bf4poll\u89e3\u51b3\u4e86select\u7b49\u5f85fd\u4e0a\u9650\u7684\u95ee\u9898&#xff1f;<\/p>\n<p>select\u662f\u4e00\u4e2a\u5177\u4f53\u7684\u6570\u636e\u7c7b\u578bfd_set&#xff0c;\u65e2\u7136\u662f\u4e00\u4e2a\u5177\u4f53\u7684\u7c7b\u578b\u90a3\u5c31\u76f4\u63a5\u51b3\u5b9a\u4e86\u6570\u636e\u7c7b\u578b\u5927\u5c0f\u53ea\u80fd\u7531\u4f60\u7684\u7f16\u8bd1\u73af\u5883\u81ea\u5df1\u5b9a&#xff0c;\u4eca\u5929\u4e0d\u4e00\u6837\u4e86&#xff0c;\u56e0\u4e3a\u8fd9\u4e2a\u6570\u7ec4\u7531\u6211\u4eec\u81ea\u5df1\u8bf4\u7684\u7b97&#xff01;<\/p>\n<h2>poll\u670d\u52a1\u5668<\/h2>\n<p>\u76f4\u63a5\u901a\u8fc7\u4e4b\u524d\u5199\u7684SelectServer\u4fee\u6539\u6210PollServer<\/p>\n<p>\u4eca\u5929poll\u670d\u52a1\u5668&#xff0c;\u4e5f\u662f\u9700\u8981\u4e00\u4e2a\u6570\u7ec4\u3002\u53ea\u4e0d\u8fc7\u4ee5\u524dselect\u6570\u7ec4\u7eaf\u7eaf\u7684\u4fdd\u5b58\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;poll\u8fd9\u91cc\u5fc5\u987b\u662f\u4fdd\u5b58struct pollfd\u7ed3\u6784\u4f53\u7684\u6570\u7ec4\u3002<\/p>\n<p>\u4e00\u822c\u6211\u4eec\u5982\u679c\u628afd\u8bbe\u7f6e\u4e3a-1\u6216\u8005\u5c0f\u4e8e0\u7684\u503c&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u5c31\u4e0d\u4f1a\u5173\u6ce8\u8fd9\u6837\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e86\u3002\u5b83\u53ea\u4f1a\u5173\u5fc3\u5927\u4e8e\u7b49\u4e8e0\u7684fd\u3002<\/p>\n<p>\u5f53\u6211\u4eec\u542f\u52a8\u670d\u52a1\u4e4b\u540e&#xff0c;\u5c31\u4e0d\u9700\u8981\u6bcf\u6b21\u8c03\u7528select\u4e4b\u524d\u90fd\u9700\u8981\u91cd\u65b0\u8bbe\u7f6efd\u4e86\u6dfb\u52a0\u5230\u8bfb\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u91cc\u9762\u4e86&#xff0c;\u7136\u540e\u624d\u80fd\u6dfb\u52a0\u5230select\u91cc\u9762\u3002\u73b0\u5728\u76f4\u63a5\u628a\u6570\u7ec4\u7ed9poll\u3002\u6240\u4ee5\u80fd\u660e\u663e\u611f\u89c9\u5230poll\u6bd4select\u7b80\u5355<\/p>\n<h3>PollServer.hpp<\/h3>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">ifndef<\/span> <span class=\"token expression\">POLL_SERVER<\/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\">POLL_SERVER<\/span><\/span><\/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;algorithm&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><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;Socket.hpp&#034;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> gsize <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>fd_set<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> gdefaultfd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PollServer<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">PollServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">uint16_t<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span> <span class=\"token function\">_listensock<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token generic-function\"><span class=\"token function\">make_unique<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>TcpSocket<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        _listensock<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">BuildListenSocketMethod<\/span><span class=\"token punctuation\">(<\/span>port<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> gsize<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            _fd_array<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> gdefaultfd<span class=\"token punctuation\">;<\/span><br \/>\n            _fd_array<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> _fd_array<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>revents <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        _fd_array<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> _listensock<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">SockFd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        _fd_array<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> POLLIN<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u76d1\u542c\u8bfb\u4e8b\u4ef6<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">Accepter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        InetAddr clientadddr<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> sockfd <span class=\"token operator\">&#061;<\/span> _listensock<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>clientadddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sockfd <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>LogLevel<span class=\"token double-colon punctuation\">::<\/span>INFO<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;get a new sockfd: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> sockfd <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;, client addr: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> clientadddr<span class=\"token punctuation\">.<\/span><span class=\"token function\">ToString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> pos <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">;<\/span> pos <span class=\"token operator\">&lt;<\/span> gsize<span class=\"token punctuation\">;<\/span> pos<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_fd_array<span class=\"token punctuation\">[<\/span>pos<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;&#061;<\/span> gdefaultfd<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    _fd_array<span class=\"token punctuation\">[<\/span>pos<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> sockfd<span class=\"token punctuation\">;<\/span><br \/>\n                    _fd_array<span class=\"token punctuation\">[<\/span>pos<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> POLLIN<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u76d1\u542c\u8bfb\u4e8b\u4ef6<\/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><br \/>\n            <span class=\"token comment\">\/\/ \u5df2\u7ecf\u6ee1\u4e86<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>pos <span class=\"token operator\">&#061;&#061;<\/span> gsize<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>LogLevel<span class=\"token double-colon punctuation\">::<\/span>WARNING<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;server is full!&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ \u53ef\u4ee5\u9009\u62e9\u6269\u5bb9<\/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 keyword\">void<\/span> <span class=\"token function\">Recver<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> index<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> sockfd <span class=\"token operator\">&#061;<\/span> _fd_array<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        ssize_t n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span> buffer<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>n <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            buffer<span class=\"token punctuation\">[<\/span>n<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;client say&#064; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> buffer <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>string echo_string <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;server echo# &#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            echo_string <span class=\"token operator\">&#043;&#061;<\/span> buffer<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> echo_string<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> echo_string<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/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 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 punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>LogLevel<span class=\"token double-colon punctuation\">::<\/span>INFO<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;client quit, me too: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> _fd_array<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">;<\/span><br \/>\n            _fd_array<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> gdefaultfd<span class=\"token punctuation\">;<\/span><br \/>\n            _fd_array<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> _fd_array<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>revents <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">else<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>LogLevel<span class=\"token double-colon punctuation\">::<\/span>WARNING<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;recv error: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> _fd_array<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">;<\/span><br \/>\n            _fd_array<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> gdefaultfd<span class=\"token punctuation\">;<\/span><br \/>\n            _fd_array<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> _fd_array<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>revents <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>sockfd<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\">void<\/span> <span class=\"token function\">EventDispatcher<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>LogLevel<span class=\"token double-colon punctuation\">::<\/span>INFO<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;fd\u5c31\u7eea,\u6709\u65b0\u4e8b\u4ef6\u5230\u6765&#034;<\/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> gsize<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_fd_array<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;&#061;<\/span> gdefaultfd<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8bfb\u4e8b\u4ef6\u5c31\u7eea<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_fd_array<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><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_fd_array<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;&#061;<\/span> _listensock<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">SockFd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token function\">Accepter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8fde\u63a5\u7ba1\u7406\u5668<\/span><br \/>\n                <span class=\"token keyword\">else<\/span><br \/>\n                    <span class=\"token function\">Recver<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ IO\u5904\u7406\u5668<\/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 keyword\">void<\/span> <span class=\"token function\">Run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> timeout <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ -1\u8868\u793a\u963b\u585e\u7b49\u5f85<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">poll<\/span><span class=\"token punctuation\">(<\/span>_fd_array<span class=\"token punctuation\">,<\/span> gsize<span class=\"token punctuation\">,<\/span> timeout<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> <span class=\"token number\">0<\/span><span class=\"token operator\">:<\/span><br \/>\n                <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>LogLevel<span class=\"token double-colon punctuation\">::<\/span>DEBUG<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;timeout&#8230;&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">:<\/span><br \/>\n                <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>LogLevel<span class=\"token double-colon punctuation\">::<\/span>ERROR<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;poll error&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n                <span class=\"token function\">EventDispatcher<\/span><span class=\"token punctuation\">(<\/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 punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token operator\">~<\/span><span class=\"token function\">PollServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>Socket<span class=\"token operator\">&gt;<\/span> _listensock<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">pollfd<\/span> _fd_array<span class=\"token punctuation\">[<\/span>gsize<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">endif<\/span><\/span><\/p>\n<p>\u6d4b\u8bd5&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250814234932-689e760c7f99d.png\" alt=\"\" \/><\/p>\n<h2>poll\u7684\u4f18\u70b9\u7f3a\u70b9<\/h2>\n<p>poll\u7684\u4f18\u70b9\u5c31\u4e0d\u7528\u8fc7\u591a\u4ecb\u7ecd&#xff0c;\u8f93\u5165\u8f93\u51fa\u5206\u79bb&#xff0c;\u800c\u4e14\u6ca1\u6709select\u4e0a\u9650\u7684\u95ee\u9898<\/p>\n<p>poll\u7684\u4e3b\u8981\u7f3a\u70b9\u4f9d\u65e7\u662f\u904d\u5386\u95ee\u9898&#xff0c;\u56e0\u4e3a\u6211\u4eec\u4ea4\u7ed9poll\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;poll\u5728\u5e95\u5c42\u53bb\u904d\u5386\u53bb\u67e5\u627e\u3002\u968f\u7740\u7b49\u5f85\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u53d8\u591a&#xff0c;poll\u8981\u7ebf\u6027\u904d\u5386\u7684\u65b9\u5f0f\u68c0\u6d4b\u6240\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u8fd9\u52bf\u5fc5\u4f1a\u5e26\u6765\u6548\u7387\u7684\u964d\u4f4e 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