{"id":26621,"date":"2025-04-19T16:16:10","date_gmt":"2025-04-19T08:16:10","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/26621.html"},"modified":"2025-04-19T16:16:10","modified_gmt":"2025-04-19T08:16:10","slug":"3-%e4%bd%bf%e7%94%a8epoll%e5%ae%9e%e7%8e%b0%e5%8d%95%e7%ba%bf%e7%a8%8b%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/26621.html","title":{"rendered":"3.\u4f7f\u7528epoll\u5b9e\u73b0\u5355\u7ebf\u7a0b\u5e76\u53d1\u670d\u52a1\u5668"},"content":{"rendered":"<p id=\"main-toc\">\u76ee\u5f55<\/p>\n<p id=\"1.%20epoll%E7%9A%84%E6%A6%82%E8%BF%B0-toc\" style=\"margin-left:40px\">1. epoll\u7684\u6982\u8ff0<\/p>\n<p id=\"2.%20%E5%A4%9A%E7%BA%BF%E7%A8%8B%E4%B8%8Eepoll%E7%9A%84%E5%A4%84%E7%90%86%E6%B5%81%E7%A8%8B-toc\" style=\"margin-left:40px\">2. \u591a\u7ebf\u7a0b\u4e0eepoll\u7684\u5904\u7406\u6d41\u7a0b<\/p>\n<p id=\"2.1%20%E5%A4%9A%E7%BA%BF%E7%A8%8B%E5%A4%84%E7%90%86%E6%B5%81%E7%A8%8B-toc\" style=\"margin-left:80px\">2.1 \u591a\u7ebf\u7a0b\u5904\u7406\u6d41\u7a0b<\/p>\n<p id=\"2.2%20epoll%E5%A4%84%E7%90%86%E6%B5%81%E7%A8%8B-toc\" style=\"margin-left:80px\">2.2 epoll\u5904\u7406\u6d41\u7a0b<\/p>\n<p id=\"3.%20epoll%E4%B8%8E%E5%A4%9A%E7%BA%BF%E7%A8%8B%E7%9A%84%E6%AF%94%E8%BE%83-toc\" style=\"margin-left:80px\">3. epoll\u4e0e\u591a\u7ebf\u7a0b\u7684\u6bd4\u8f83<\/p>\n<p id=\"4.%20epoll%E7%9A%84%E6%93%8D%E4%BD%9C%E5%87%BD%E6%95%B0-toc\" style=\"margin-left:40px\">4. epoll\u7684\u64cd\u4f5c\u51fd\u6570<\/p>\n<p id=\"4.1%20epoll_create()-toc\" style=\"margin-left:80px\">4.1 epoll_create()<\/p>\n<p id=\"4.2%20epoll_ctl()-toc\" style=\"margin-left:80px\">4.2 epoll_ctl()<\/p>\n<p id=\"4.3%20epoll_wait()-toc\" style=\"margin-left:80px\">4.3 epoll_wait()<\/p>\n<p id=\"5.%20%E7%A4%BA%E4%BE%8B%E4%BB%A3%E7%A0%81-toc\" style=\"margin-left:40px\">5. \u793a\u4f8b\u4ee3\u7801<\/p>\n<p id=\"6.%20epoll%E7%9A%84%E5%B7%A5%E4%BD%9C%E6%A8%A1%E5%BC%8F-toc\" style=\"margin-left:40px\">6. epoll\u7684\u5de5\u4f5c\u6a21\u5f0f<\/p>\n<p id=\"7.%20%E4%BD%BF%E7%94%A8O_NONBLOCK%E9%98%B2%E6%AD%A2%E9%98%BB%E5%A1%9E-toc\" style=\"margin-left:40px\">7. \u4f7f\u7528O_NONBLOCK\u9632\u6b62\u963b\u585e<\/p>\n<p id=\"8.%E8%BF%90%E8%A1%8C%E4%BB%A3%E7%A0%81-toc\" style=\"margin-left:40px\">8.\u8fd0\u884c\u4ee3\u7801<\/p>\n<p id=\"%E5%AE%A2%E6%88%B7%E7%AB%AF%E4%BB%A3%E7%A0%81%EF%BC%88client.cpp%EF%BC%89-toc\" style=\"margin-left:80px\">\u5ba2\u6237\u7aef\u4ee3\u7801\uff08client.cpp\uff09<\/p>\n<p id=\"%E6%9C%8D%E5%8A%A1%E5%99%A8%E4%BB%A3%E7%A0%81%EF%BC%88server.cpp%EF%BC%89-toc\" style=\"margin-left:80px\">\u670d\u52a1\u5668\u4ee3\u7801\uff08server.cpp\uff09<\/p>\n<p id=\"%E8%BF%90%E8%A1%8C%E6%96%B9%E5%BC%8F-toc\" style=\"margin-left:80px\">\u8fd0\u884c\u65b9\u5f0f<\/p>\n<hr id=\"hr-toc\">\n<p>\u5728\u6784\u5efa\u73b0\u4ee3\u7f51\u7edc\u5e94\u7528\u65f6\uff0c\u5904\u7406\u5e76\u53d1\u8fde\u63a5\u662f\u4e00\u4e2a\u5173\u952e\u9700\u6c42\u3002\u5c3d\u7ba1\u4f7f\u7528\u591a\u7ebf\u7a0b\u53ef\u4ee5\u65b9\u4fbf\u5730\u5b9e\u73b0\u5e76\u53d1\u670d\u52a1\u5668\uff0c\u4f46\u901a\u8fc7epoll\u5b9e\u73b0\u5355\u7ebf\u7a0b\u5e76\u53d1\u4e5f\u662f\u4e00\u79cd\u9ad8\u6548\u7684\u89e3\u51b3\u65b9\u6848\u3002epoll\u662fLinux\u4e0b\u7684\u4e00\u79cdI\/O\u591a\u8def\u590d\u7528\u673a\u5236\uff0c\u76f8\u8f83\u4e8e\u4f20\u7edf\u7684select\u548cpoll\uff0cepoll\u5728\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u5177\u6709\u66f4\u4f18\u7684\u6027\u80fd\u548c\u53ef\u6269\u5c55\u6027\u3002<\/p>\n<h3 id=\"1.%20epoll%E7%9A%84%E6%A6%82%E8%BF%B0\">1. epoll\u7684\u6982\u8ff0<\/h3>\n<ul>\n<li>\u591a\u8def\u590d\u7528\uff1a\u6307\u53ef\u4ee5\u540c\u65f6\u76d1\u63a7\u591a\u4e2a\u7f51\u7edc\u8fde\u63a5\uff0c\u5e76\u5728\u540c\u4e00\u7ebf\u7a0b\u4e2d\u5904\u7406\u8fd9\u4e9b\u8fde\u63a5\u3002<\/li>\n<li>epoll vs select\/poll\uff1aepoll\u5728\u5904\u7406\u5927\u91cf\u5e76\u53d1\u8fde\u63a5\u65f6\uff0c\u6027\u80fd\u901a\u5e38\u4f18\u4e8eselect\u548cpoll\uff0c\u7279\u522b\u662f\u5728\u8fde\u63a5\u6570\u8fbe\u5230\u4e0a\u4e07\u7684\u60c5\u51b5\u4e0b\u3002epoll\u662fLinux\u7279\u6709\u7684\u7279\u6027\uff0c\u65e0\u6cd5\u5728\u5176\u4ed6\u64cd\u4f5c\u7cfb\u7edf\u4e0a\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h3 id=\"2.%20%E5%A4%9A%E7%BA%BF%E7%A8%8B%E4%B8%8Eepoll%E7%9A%84%E5%A4%84%E7%90%86%E6%B5%81%E7%A8%8B\">2. \u591a\u7ebf\u7a0b\u4e0eepoll\u7684\u5904\u7406\u6d41\u7a0b<\/h3>\n<h4 id=\"2.1%20%E5%A4%9A%E7%BA%BF%E7%A8%8B%E5%A4%84%E7%90%86%E6%B5%81%E7%A8%8B\">2.1 \u591a\u7ebf\u7a0b\u5904\u7406\u6d41\u7a0b<\/h4>\n<p>\u5728\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u4e2d\uff0c\u901a\u5e38\u4f1a\u6709\u4ee5\u4e0b\u7684\u5904\u7406\u6d41\u7a0b\uff1a<\/p>\n<ul>\n<li>\n<p>\u4e3b\u7ebf\u7a0b\uff1a<\/p>\n<ul>\n<li>\u8c03\u7528accept()\u4ee5\u68c0\u6d4b\u662f\u5426\u6709\u65b0\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42\u3002<\/li>\n<li>\u82e5\u5b58\u5728\u65b0\u8fde\u63a5\uff0c\u8bf7\u6c42\u5efa\u7acb\u8fde\u63a5\u3002<\/li>\n<li>\u82e5\u65e0\u65b0\u8fde\u63a5\uff0c\u8bf7\u6c42\uff0c\u5219\u4e3b\u7ebf\u7a0b\u5c06\u963b\u585e\u5728accept()\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5b50\u7ebf\u7a0b\uff1a<\/p>\n<ul>\n<li>\u8c03\u7528read()\u548cwrite()\u51fd\u6570\uff0c\u4e0e\u5df2\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u8fdb\u884c\u6570\u636e\u6536\u53d1\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4 id=\"2.2%20epoll%E5%A4%84%E7%90%86%E6%B5%81%E7%A8%8B\">2.2 epoll\u5904\u7406\u6d41\u7a0b<\/h4>\n<p>\u4f7f\u7528epoll\u5b9e\u73b0\u5355\u7ebf\u7a0b\u5e76\u53d1\u7684\u5904\u7406\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n<li>\u4f7f\u7528epoll_wait()\u51fd\u6570\u59d4\u6258\u5185\u6838\u68c0\u6d4b\u6240\u6709\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08\u4e3b\u8981\u5206\u4e3a\u76d1\u542c\u548c\u901a\u4fe1\u4e24\u7c7b\uff09\u3002\u8fd9\u5c06\u5bfc\u81f4\u7ebf\u7a0b\u963b\u585e\uff0c\u76f4\u5230\u6709\u5df2\u51c6\u5907\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>\u4e00\u65e6\u68c0\u6d4b\u5230\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5185\u6838\u4f1a\u5c06\u5176\u4f20\u9012\u7ed9\u7528\u6237\u7a7a\u95f4\uff0c\u89e3\u9664\u963b\u585e\u3002<\/li>\n<li>\u5bf9\u4e8e\u4f20\u51fa\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u5224\u65ad\uff1a\n<ul>\n<li>\u5982\u679c\u662f\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5219\u8c03\u7528accept()\u5efa\u7acb\u65b0\u8fde\u63a5\u3002<\/li>\n<li>\u5982\u679c\u662f\u901a\u4fe1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5219\u8c03\u7528read()\u6216write()\u4e0e\u8be5\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u8fdb\u884c\u901a\u4fe1\u3002<\/li>\n<\/ul>\n<\/li>\n<p>\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0cepoll\u53ef\u4ee5\u5728\u5355\u7ebf\u7a0b\u573a\u666f\u4e0b\u5b9e\u73b0\u5e76\u53d1\u670d\u52a1\u5668\u3002<\/p>\n<h4 id=\"3.%20epoll%E4%B8%8E%E5%A4%9A%E7%BA%BF%E7%A8%8B%E7%9A%84%E6%AF%94%E8%BE%83\">3. epoll\u4e0e\u591a\u7ebf\u7a0b\u7684\u6bd4\u8f83<\/h4>\n<ul>\n<li>\u7cfb\u7edf\u5f00\u9500\u5c0f\uff1a\u4e0e\u591a\u7ebf\u7a0b\u6a21\u578b\u76f8\u6bd4\uff0cepoll\u907f\u514d\u4e86\u7ebf\u7a0b\u7684\u521b\u5efa\u548c\u9500\u6bc1\uff0c\u4ee5\u53ca\u7ebf\u7a0b\u7ba1\u7406\u7684\u5f00\u9500\u3002<\/li>\n<li>\u7b80\u5316\u7ba1\u7406\uff1a\u4f7f\u7528epoll\u53ef\u4ee5\u66f4\u5bb9\u6613\u5730\u63a7\u5236\u5e76\u53d1\u64cd\u4f5c\uff0c\u6ca1\u6709\u7ebf\u7a0b\u4e4b\u95f4\u7684\u4e0a\u4e0b\u6587\u5207\u6362\u3002<\/li>\n<\/ul>\n<h3 id=\"4.%20epoll%E7%9A%84%E6%93%8D%E4%BD%9C%E5%87%BD%E6%95%B0\">4. epoll\u7684\u64cd\u4f5c\u51fd\u6570<\/h3>\n<h4 id=\"4.1%20epoll_create()\">4.1 epoll_create()<\/h4>\n<p>int epoll_create(int size);<\/p>\n<ul>\n<li>\u521b\u5efa\u4e00\u4e2aepoll\u5b9e\u4f8b\uff0c\u901a\u8fc7\u4e00\u68f5\u7ea2\u9ed1\u6811\u7ba1\u7406\u5f85\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u3002<\/li>\n<li>\u53c2\u6570\uff1asize\u5728Linux\u5185\u68382.6.8\u7248\u672c\u4ee5\u540e\u88ab\u5ffd\u7565\uff0c\u53ea\u9700\u4f20\u5165\u5927\u4e8e0\u7684\u503c\u3002<\/li>\n<li>\u8fd4\u56de\u503c\uff1a\n<ul>\n<li>\u6210\u529f\u65f6\uff0c\u8fd4\u56de\u4e00\u4e2a\u6709\u6548\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u8868\u793a\u521b\u5efa\u7684epoll\u5b9e\u4f8b\u3002<\/li>\n<li>\u5931\u8d25\u65f6\uff0c\u8fd4\u56de-1\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n<p>int epfd = epoll_create(1);<\/p>\n<h4 id=\"4.2%20epoll_ctl()\">4.2 epoll_ctl()<\/h4>\n<p>int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);<\/p>\n<ul>\n<li>\u7ba1\u7406\u7ea2\u9ed1\u6811\u4e0a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08\u6dfb\u52a0\u3001\u4fee\u6539\u3001\u5220\u9664\uff09\u3002<\/li>\n<li>\u53c2\u6570\uff1a\n<ul>\n<li>epfd: epoll_create()\u8fd4\u56de\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>op: \u64cd\u4f5c\u7c7b\u578b\uff08EPOLL_CTL_ADD, EPOLL_CTL_MOD, EPOLL_CTL_DEL\uff09\u3002<\/li>\n<li>fd: \u9700\u8981\u64cd\u4f5c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>event: \u6307\u5411epoll_event\u7ed3\u6784\u4f53\u7684\u6307\u9488\uff0c\u7528\u4e8e\u8bbe\u7f6e\u76d1\u63a7\u7684\u4e8b\u4ef6\u3002\n<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>epoll_eve<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb958\u6b21\uff0c\u70b9\u8d5e27\u6b21\uff0c\u6536\u85cf22\u6b21\u3002\u591a\u8def\u590d\u7528\uff1a\u6307\u53ef\u4ee5\u540c\u65f6\u76d1\u63a7\u591a\u4e2a\u7f51\u7edc\u8fde\u63a5\uff0c\u5e76\u5728\u540c\u4e00\u7ebf\u7a0b\u4e2d\u5904\u7406\u8fd9\u4e9b\u8fde\u63a5\u3002epoll\u5728\u5904\u7406\u5927\u91cf\u5e76\u53d1\u8fde\u63a5\u65f6\uff0c\u6027\u80fd\u901a\u5e38\u4f18\u4e8eselect\u548cpoll\uff0c\u7279\u522b\u662f\u5728\u8fde\u63a5\u6570\u8fbe\u5230\u4e0a\u4e07\u7684\u60c5\u51b5\u4e0b\u3002epoll\u662fLinux\u7279\u6709\u7684\u7279\u6027\uff0c\u65e0\u6cd5\u5728\u5176\u4ed6\u64cd\u4f5c\u7cfb\u7edf\u4e0a\u4f7f\u7528\u3002_epoll create accept 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