{"id":208389,"date":"2025-08-30T09:49:46","date_gmt":"2025-08-30T01:49:46","guid":{"rendered":"https:\/\/www.server.hk\/blog\/?p=208389"},"modified":"2025-08-30T09:49:46","modified_gmt":"2025-08-30T01:49:46","slug":"%e7%90%86%e8%a7%a3linux%e5%86%85%e6%a0%b8%e4%b8%ad%e7%9a%84epoll%e6%a8%a1%e5%9e%8b%e4%bb%a5%e5%ae%9e%e7%8e%b0%e9%ab%98%e6%95%88%e7%bd%91%e7%bb%9ci-o","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208389\/","title":{"rendered":"\u7406\u89e3Linux\u5185\u6838\u4e2d\u7684Epoll\u6a21\u578b\u4ee5\u5b9e\u73b0\u9ad8\u6548\u7f51\u7edcI\/O"},"content":{"rendered":"<h2 dir=\"auto\">Linux I\/O\u673a\u5236\u7b80\u4ecb<\/h2>\n<p dir=\"auto\">\u5728Linux\u7f51\u7edc\u7f16\u7a0b\u4e2d\uff0c\u6709\u6548\u7ba1\u7406\u8f93\u5165\/\u8f93\u51fa\uff08I\/O\uff09\u64cd\u4f5c\u5bf9\u4e8e\u9ad8\u6027\u80fd\u5e94\u7528\u81f3\u5173\u91cd\u8981\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u591a\u4e2a\u8fde\u63a5\u7684\u670d\u52a1\u5668\u73af\u5883\u4e2d\u3002epoll\u6a21\u578b\u662f\u4e00\u79cd\u5f3a\u5927\u7684I\/O\u591a\u8def\u590d\u7528\u673a\u5236\uff0c\u65e8\u5728\u89e3\u51b3\u65e9\u671f\u65b9\u6cd5\uff08\u5982select\u548cpoll\uff09\u7684\u5c40\u9650\u6027\u3002\u672c\u6587\u5c06\u63a2\u8ba8epoll\u6a21\u578b\uff0c\u4e0e\u5176\u4ed6I\/O\u65b9\u6cd5\u8fdb\u884c\u6bd4\u8f83\uff0c\u5e76\u63d0\u4f9b\u5728\u73b0\u4ee3\u7f51\u7edc\u5e94\u7528\u4e2d\u5229\u7528epoll\u7684\u5b9e\u7528\u6307\u5bfc\u3002<\/p>\n<h2 dir=\"auto\">Linux I\/O\u6838\u5fc3\u6982\u5ff5<\/h2>\n<p dir=\"auto\">\u8981\u7406\u89e3epoll\uff0c\u5fc5\u987b\u5148\u638c\u63e1Linux I\/O\u64cd\u4f5c\u7684\u57fa\u7840\u6982\u5ff5\uff1a<\/p>\n<ul dir=\"auto\">\n<li><strong>\u7528\u6237\u7a7a\u95f4\u4e0e\u5185\u6838\u7a7a\u95f4<\/strong>\uff1aLinux\u5c06\u865a\u62df\u5185\u5b58\u5206\u4e3a\u7528\u6237\u7a7a\u95f4\uff08\u7528\u4e8e\u5e94\u7528\u7a0b\u5e8f\u8fdb\u7a0b\uff09\u548c\u5185\u6838\u7a7a\u95f4\uff08\u7528\u4e8e\u64cd\u4f5c\u7cfb\u7edf\uff09\u3002\u572832\u4f4d\u7cfb\u7edf\u4e2d\uff0c\u7528\u6237\u7a7a\u95f4\u5360\u7528\u8f83\u4f4e\u76843GB\u865a\u62df\u5730\u5740\uff080x00000000\u52300xBFFFFFFF\uff09\uff0c\u800c\u5185\u6838\u7a7a\u95f4\u4f7f\u7528\u8f83\u9ad8\u76841GB\uff080xC0000000\u52300xFFFFFFFF\uff09\u3002\u8fd9\u79cd\u5206\u79bb\u786e\u4fdd\u7528\u6237\u8fdb\u7a0b\u65e0\u6cd5\u76f4\u63a5\u8bbf\u95ee\u5185\u6838\u8d44\u6e90\uff0c\u4ece\u800c\u589e\u5f3a\u7cfb\u7edf\u5b89\u5168\u6027\u3002<\/li>\n<li><strong>\u8fdb\u7a0b\u5207\u6362<\/strong>\uff1a\u8fdb\u7a0b\u5207\u6362\u6d89\u53ca\u4fdd\u5b58\u5f53\u524d\u8fdb\u7a0b\u7684\u4e0a\u4e0b\u6587\uff08\u4f8b\u5982\u7a0b\u5e8f\u8ba1\u6570\u5668\u548c\u5bc4\u5b58\u5668\uff09\u3001\u66f4\u65b0\u8fdb\u7a0b\u63a7\u5236\u5757\uff08PCB\uff09\u3001\u5c06\u8fdb\u7a0b\u6392\u5165\u961f\u5217\u4ee5\u53ca\u6062\u590d\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u7684\u4e0a\u4e0b\u6587\u3002\u6b64\u64cd\u4f5c\u8d44\u6e90\u6d88\u8017\u8f83\u5927\uff0c\u9891\u7e41\u5207\u6362\u4f1a\u5f71\u54cd\u7cfb\u7edf\u6027\u80fd\u3002<\/li>\n<li><strong>\u8fdb\u7a0b\u963b\u585e<\/strong>\uff1a\u5f53\u8fdb\u7a0b\u7b49\u5f85\u67d0\u4e9b\u4e8b\u4ef6\uff08\u5982\u6570\u636e\u53ef\u7528\u6216\u8d44\u6e90\u5206\u914d\uff09\u65f6\uff0c\u53ef\u80fd\u8fdb\u5165\u963b\u585e\u72b6\u6001\u3002\u963b\u585e\u662f\u8fdb\u7a0b\u7684\u4e3b\u52a8\u884c\u4e3a\uff0c\u5728\u6b64\u72b6\u6001\u4e0b\u4e0d\u6d88\u8017CPU\u8d44\u6e90\u3002<\/li>\n<li><strong>\u6587\u4ef6\u63cf\u8ff0\u7b26<\/strong>\uff1a\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u975e\u8d1f\u6574\u6570\uff0c\u8868\u793a\u8fdb\u7a0b\u4e2d\u6253\u5f00\u7684\u6587\u4ef6\u6216\u5957\u63a5\u5b57\u3002\u5b83\u4eec\u662f\u5185\u6838\u7ef4\u62a4\u7684\u6bcf\u4e2a\u8fdb\u7a0b\u6253\u5f00\u6587\u4ef6\u8868\u7684\u7d22\u5f15\uff0c\u5728\u7c7bUnix\u7cfb\u7edf\u4e2d\u5bf9I\/O\u64cd\u4f5c\u81f3\u5173\u91cd\u8981\u3002<\/li>\n<li><strong>\u7f13\u5b58I\/O<\/strong>\uff1a\u5927\u591a\u6570Linux\u6587\u4ef6\u7cfb\u7edf\u4f7f\u7528\u7f13\u5b58I\/O\uff0c\u6570\u636e\u9996\u5148\u88ab\u590d\u5236\u5230\u5185\u6838\u7684\u9875\u9762\u7f13\u5b58\u4e2d\uff0c\u7136\u540e\u518d\u4f20\u8f93\u5230\u7528\u6237\u7a7a\u95f4\u3002\u867d\u7136\u8fd9\u63d0\u9ad8\u4e86\u91cd\u590d\u8bbf\u95ee\u7684\u6027\u80fd\uff0c\u4f46\u591a\u6b21\u6570\u636e\u590d\u5236\u4f1a\u5e26\u6765\u5f00\u9500\u3002<\/li>\n<\/ul>\n<h2 dir=\"auto\">Linux I\/O\u6a21\u578b<\/h2>\n<p dir=\"auto\">Linux\u652f\u6301\u591a\u79cd\u7f51\u7edcI\/O\u6a21\u578b\uff0c\u6bcf\u79cd\u6a21\u578b\u5177\u6709\u4e0d\u540c\u7684\u7279\u6027\u3002\u6570\u636e\u4f20\u8f93\u8fc7\u7a0b\u901a\u5e38\u5305\u62ec\u4e24\u4e2a\u9636\u6bb5\uff1a\u7b49\u5f85\u6570\u636e\u51c6\u5907\u5c31\u7eea\u548c\u5c06\u6570\u636e\u4ece\u5185\u6838\u590d\u5236\u5230\u7528\u6237\u8fdb\u7a0b\u3002\u4ee5\u4e0b\u662f\u4e3b\u8981\u7684I\/O\u6a21\u578b\uff1a<\/p>\n<h3 dir=\"auto\">\u963b\u585eI\/O<\/h3>\n<p dir=\"auto\">\u5728\u963b\u585eI\/O\u4e2d\uff0c\u5f53\u8fdb\u7a0b\u8c03\u7528\u5982recvfrom\u7684\u7cfb\u7edf\u51fd\u6570\u65f6\uff0c\u4f1a\u7b49\u5f85\u6570\u636e\u5728\u5185\u6838\u7f13\u51b2\u533a\u51c6\u5907\u597d\u5e76\u590d\u5236\u5230\u7528\u6237\u5185\u5b58\u3002\u6570\u636e\u51c6\u5907\u548c\u6570\u636e\u590d\u5236\u4e24\u4e2a\u9636\u6bb5\u90fd\u662f\u963b\u585e\u7684\uff0c\u8fdb\u7a0b\u5728\u64cd\u4f5c\u5b8c\u6210\u524d\u88ab\u6302\u8d77\u3002<\/p>\n<ul dir=\"auto\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a\u7b80\u5355\uff0c\u4f46\u5bf9\u4e8e\u5904\u7406\u591a\u4e2a\u8fde\u63a5\u6548\u7387\u4f4e\uff0c\u56e0\u4e3a\u8fdb\u7a0b\u4f1a\u4e0d\u65ad\u88ab\u963b\u585e\u3002<\/li>\n<li><strong>\u4f7f\u7528\u573a\u666f<\/strong>\uff1a\u9002\u7528\u4e8e\u5e76\u53d1\u9700\u6c42\u4f4e\u7684\u5e94\u7528\u7a0b\u5e8f\u3002<\/li>\n<\/ul>\n<h3 dir=\"auto\">\u975e\u963b\u585eI\/O<\/h3>\n<p dir=\"auto\">\u975e\u963b\u585eI\/O\u5141\u8bb8\u8fdb\u7a0b\u68c0\u67e5\u6570\u636e\u53ef\u7528\u6027\u800c\u4e0d\u9700\u7b49\u5f85\u3002\u5982\u679c\u6570\u636e\u672a\u51c6\u5907\u597d\uff0c\u5185\u6838\u8fd4\u56de\u9519\u8bef\uff08\u5982EAGAIN\uff09\uff0c\u8fdb\u7a0b\u7a0d\u540e\u91cd\u8bd5\u3002\u5f53\u6570\u636e\u51c6\u5907\u597d\u65f6\uff0c\u8fdb\u7a0b\u8c03\u7528recvfrom\u8fdb\u884c\u590d\u5236\uff0c\u6b64\u65f6\u8fdb\u7a0b\u77ed\u6682\u963b\u585e\u3002<\/p>\n<ul dir=\"auto\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a\u51cf\u5c11\u963b\u585e\uff0c\u4f46\u9700\u8981\u8fdb\u7a0b\u53cd\u590d\u8f6e\u8be2\u5185\u6838\uff0c\u589e\u52a0CPU\u4f7f\u7528\u7387\u3002<\/li>\n<li><strong>\u4f7f\u7528\u573a\u666f<\/strong>\uff1a\u9002\u7528\u4e8e\u9700\u8981\u5feb\u901f\u54cd\u5e94\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u4f46\u4ecd\u53d7\u8f6e\u8be2\u5f00\u9500\u9650\u5236\u3002<\/li>\n<\/ul>\n<h3 dir=\"auto\">I\/O\u591a\u8def\u590d\u7528<\/h3>\n<p dir=\"auto\">I\/O\u591a\u8def\u590d\u7528\u901a\u8fc7select\u3001poll\u6216epoll\u5b9e\u73b0\uff0c\u5141\u8bb8\u5355\u4e2a\u8fdb\u7a0b\u76d1\u63a7\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u5f53\u4efb\u4e00\u63cf\u8ff0\u7b26\u51c6\u5907\u597d\u65f6\uff0c\u901a\u77e5\u8fdb\u7a0b\u6267\u884cI\/O\u64cd\u4f5c\u3002\u6b64\u6a21\u578b\u662f\u540c\u6b65\u7684\uff0c\u56e0\u4e3a\u8fdb\u7a0b\u81ea\u884c\u5904\u7406\u6570\u636e\u590d\u5236\u3002<\/p>\n<ul dir=\"auto\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a\u9002\u5408\u7ba1\u7406\u591a\u4e2a\u8fde\u63a5\uff0c\u4f46\u6d89\u53ca\u7cfb\u7edf\u8c03\u7528\u5f00\u9500\uff08\u4f8b\u5982\uff0cselect\u9700\u8981\u4e24\u6b21\u8c03\u7528\uff1aselect\u548crecvfrom\uff09\u3002<\/li>\n<li><strong>\u4f7f\u7528\u573a\u666f<\/strong>\uff1a\u9002\u5408\u5904\u7406\u4e2d\u9ad8\u8fde\u63a5\u91cf\u7684\u670d\u52a1\u5668\u3002<\/li>\n<\/ul>\n<h3 dir=\"auto\">\u5f02\u6b65I\/O<\/h3>\n<p dir=\"auto\">\u5728\u5f02\u6b65I\/O\u4e2d\uff0c\u8fdb\u7a0b\u53d1\u8d77I\/O\u64cd\u4f5c\u540e\u53ef\u7ee7\u7eed\u5176\u4ed6\u4efb\u52a1\u3002\u5185\u6838\u5904\u7406\u6570\u636e\u51c6\u5907\u548c\u590d\u5236\uff0c\u5b8c\u6210\u540e\u901a\u8fc7\u4fe1\u53f7\u901a\u77e5\u8fdb\u7a0b\u3002\u6b64\u6a21\u578b\u5168\u7a0b\u975e\u963b\u585e\u3002<\/p>\n<ul dir=\"auto\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a\u6548\u7387\u6700\u9ad8\uff0c\u8fdb\u7a0b\u5f00\u9500\u6700\u5c0f\uff0c\u4f46Linux\u7684\u5f02\u6b65I\/O\u652f\u6301\uff08\u5982aio\u7cfb\u5217\uff09\u4e0d\u591f\u6210\u719f\uff0c\u4f7f\u7528\u8f83\u5c11\u3002<\/li>\n<li><strong>\u4f7f\u7528\u573a\u666f<\/strong>\uff1a\u9002\u7528\u4e8e\u9700\u8981\u6781\u4f4e\u5ef6\u8fdf\u7684\u9ad8\u6027\u80fd\u7cfb\u7edf\u3002<\/li>\n<\/ul>\n<h2 dir=\"auto\">I\/O\u6a21\u578b\u6bd4\u8f83<\/h2>\n<div dir=\"auto\">\n<div>\n<div><\/div>\n<\/div>\n<table dir=\"auto\" data-wide=\"false\">\n<thead>\n<tr>\n<th data-col-size=\"sm\"><strong>\u6a21\u578b<\/strong><\/th>\n<th data-col-size=\"md\"><strong>\u963b\u585e\u884c\u4e3a<\/strong><\/th>\n<th data-col-size=\"lg\"><strong>\u6548\u7387<\/strong><\/th>\n<th data-col-size=\"lg\"><strong>\u4f7f\u7528\u573a\u666f<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td data-col-size=\"sm\">\u963b\u585eI\/O<\/td>\n<td data-col-size=\"md\">\u4e24\u4e2a\u9636\u6bb5\u5747\u963b\u585e<\/td>\n<td data-col-size=\"lg\">\u591a\u8fde\u63a5\u65f6\u6548\u7387\u4f4e<\/td>\n<td data-col-size=\"lg\">\u7b80\u5355\u3001\u4f4e\u5e76\u53d1\u5e94\u7528<\/td>\n<\/tr>\n<tr>\n<td data-col-size=\"sm\">\u975e\u963b\u585eI\/O<\/td>\n<td data-col-size=\"md\">\u4ec5\u6570\u636e\u590d\u5236\u65f6\u963b\u585e<\/td>\n<td data-col-size=\"lg\">\u8f6e\u8be2\u5f00\u9500\u4e2d\u7b49<\/td>\n<td data-col-size=\"lg\">\u54cd\u5e94\u5feb\u901f\u4f46\u8fde\u63a5\u5c11\u7684\u573a\u666f<\/td>\n<\/tr>\n<tr>\n<td data-col-size=\"sm\">I\/O\u591a\u8def\u590d\u7528<\/td>\n<td data-col-size=\"md\">\u76d1\u63a7\u671f\u95f4\u963b\u585e<\/td>\n<td data-col-size=\"lg\">\u591a\u8fde\u63a5\u65f6\u6548\u7387\u9ad8<\/td>\n<td data-col-size=\"lg\">\u4e2d\u9ad8\u8fde\u63a5\u91cf\u7684\u670d\u52a1\u5668<\/td>\n<\/tr>\n<tr>\n<td data-col-size=\"sm\">\u5f02\u6b65I\/O<\/td>\n<td data-col-size=\"md\">\u5168\u7a0b\u975e\u963b\u585e<\/td>\n<td data-col-size=\"lg\">\u6700\u9ad8\uff0c\u8fdb\u7a0b\u5f00\u9500\u6700\u5c0f<\/td>\n<td data-col-size=\"lg\">\u9ad8\u6027\u80fd\u3001\u4f4e\u5ef6\u8fdf\u7cfb\u7edf<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3 dir=\"auto\">\u540c\u6b65I\/O\u4e0e\u5f02\u6b65I\/O\u7684\u533a\u522b<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u540c\u6b65I\/O<\/strong>\uff1a\u5305\u62ec\u963b\u585e\u3001\u975e\u963b\u585e\u548cI\/O\u591a\u8def\u590d\u7528\u6a21\u578b\u3002\u5728\u6570\u636e\u590d\u5236\u9636\u6bb5\uff08\u5982\u975e\u963b\u585eI\/O\u4e2d\u6570\u636e\u51c6\u5907\u597d\u540e\u7684recvfrom\uff09\uff0c\u8fdb\u7a0b\u4f1a\u88ab\u963b\u585e\u3002<\/li>\n<li><strong>\u5f02\u6b65I\/O<\/strong>\uff1a\u8fdb\u7a0b\u4ece\u4e0d\u963b\u585e\uff0c\u5185\u6838\u5904\u7406\u6574\u4e2aI\/O\u64cd\u4f5c\u5e76\u5728\u5b8c\u6210\u540e\u53d1\u51fa\u4fe1\u53f7\u3002<\/li>\n<\/ul>\n<h2 dir=\"auto\">I\/O\u591a\u8def\u590d\u7528\u8be6\u89e3\uff1aSelect\u3001Poll\u548cEpoll<\/h2>\n<p dir=\"auto\">I\/O\u591a\u8def\u590d\u7528\u673a\u5236\u5141\u8bb8\u5355\u4e2a\u8fdb\u7a0b\u9ad8\u6548\u76d1\u63a7\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u4ee5\u4e0b\u5bf9select\u3001poll\u548cepoll\u8fdb\u884c\u6bd4\u8f83\uff0c\u91cd\u70b9\u4ecb\u7ecd\u5176\u6280\u672f\u7ec6\u8282\u548c\u6027\u80fd\u3002<\/p>\n<h3 dir=\"auto\">Select<\/h3>\n<p dir=\"auto\">select\u51fd\u6570\u76d1\u63a7\u4e09\u7c7b\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08\u8bfb\u3001\u5199\u548c\u5f02\u5e38\uff09\uff0c\u5e76\u963b\u585e\u76f4\u5230\u4e00\u4e2a\u6216\u591a\u4e2a\u63cf\u8ff0\u7b26\u51c6\u5907\u597d\u6216\u8d85\u65f6\u3002<\/p>\n<div dir=\"auto\">\n<div>\n<div>c<\/div>\n<div>\n<div>\n<div><\/div>\n<\/div>\n<\/div>\n<div><code><\/code><\/p>\n<div>\n<div>\n<div>int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<ul dir=\"auto\">\n<li><strong>\u4f18\u70b9<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u8de8\u5e73\u53f0\u517c\u5bb9\u6027\u5f3a\u3002<\/li>\n<li>\u9002\u5408\u5c0f\u89c4\u6a21\u5e94\u7528\u7684\u7b80\u5355\u5b9e\u73b0\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u9ed8\u8ba4\u9650\u52361024\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08\u53ef\u4fee\u6539\u4f46\u6548\u7387\u4f4e\uff09\u3002<\/li>\n<li>\u7ebf\u6027\u626b\u63cf\u63cf\u8ff0\u7b26\uff0c\u6548\u7387\u968f\u63cf\u8ff0\u7b26\u6570\u91cf\u589e\u52a0\u800c\u4e0b\u964d\u3002<\/li>\n<li>\u6bcf\u6b21\u8c03\u7528\u9700\u5728\u7528\u6237\u548c\u5185\u6838\u95f4\u590d\u5236\u63cf\u8ff0\u7b26\u96c6\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">Poll<\/h3>\n<p dir=\"auto\">poll\u51fd\u6570\u901a\u8fc7pollfd\u7ed3\u6784\u76d1\u63a7\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u6d88\u9664\u4e861024\u63cf\u8ff0\u7b26\u7684\u9650\u5236\u3002<\/p>\n<div dir=\"auto\">\n<div>\n<div>c<\/div>\n<div>\n<div>\n<div><\/div>\n<\/div>\n<\/div>\n<div><code><\/code><\/p>\n<div>\n<div>\n<div>struct pollfd {<\/div>\n<div>int fd; \/* \u6587\u4ef6\u63cf\u8ff0\u7b26 *\/<\/div>\n<div>short events; \/* \u76d1\u63a7\u7684\u4e8b\u4ef6 *\/<\/div>\n<div>short revents; \/* \u53d1\u751f\u7684\u4e8b\u4ef6 *\/<\/div>\n<div>};<\/div>\n<div>int poll(struct pollfd *fds, unsigned int nfds, int timeout);<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<ul dir=\"auto\">\n<li><strong>\u4f18\u70b9<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u65e0\u63cf\u8ff0\u7b26\u6570\u91cf\u9650\u5236\u3002<\/li>\n<li>\u63a5\u53e3\u6bd4select\u66f4\u6e05\u6670\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u4ecd\u9700\u7ebf\u6027\u626b\u63cf\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>\u6027\u80fd\u968f\u63cf\u8ff0\u7b26\u6570\u91cf\u589e\u52a0\u800c\u4e0b\u964d\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">Epoll<\/h3>\n<p dir=\"auto\">epoll\u662fLinux 2.6\u5185\u6838\u5f15\u5165\u7684\u53ef\u6269\u5c55I\/O\u591a\u8def\u590d\u7528\u673a\u5236\uff0c\u4e13\u4e3a\u9ad8\u6027\u80fd\u5e94\u7528\u8bbe\u8ba1\u3002<\/p>\n<h4 dir=\"auto\">Epoll\u63a5\u53e3<\/h4>\n<p dir=\"auto\">epoll\u4f7f\u7528\u4ee5\u4e0b\u4e09\u4e2a\u5173\u952e\u51fd\u6570\uff1a<\/p>\n<ol dir=\"auto\">\n<li><strong>epoll_create<\/strong>\uff1a\n<div dir=\"auto\">\n<div>\n<div>c<\/div>\n<div>\n<div>\n<div><\/div>\n<\/div>\n<\/div>\n<div><code><\/code><\/p>\n<div>\n<div>\n<div>int epoll_create(int size);<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<p>\u521b\u5efa\u4e00\u4e2aepoll\u5b9e\u4f8b\uff0c\u8fd4\u56de\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002size\u53c2\u6570\u63d0\u793a\u5185\u6838\u5206\u914d\u5185\u90e8\u6570\u636e\u7ed3\u6784\uff08\u975e\u786c\u6027\u9650\u5236\uff09\u3002\u8fd4\u56de\u7684\u63cf\u8ff0\u7b26\u9700\u4f7f\u7528close()\u5173\u95ed\u4ee5\u9632\u8d44\u6e90\u6cc4\u6f0f\u3002<\/li>\n<li><strong>epoll_ctl<\/strong>\uff1a\n<div dir=\"auto\">\n<div>\n<div>c<\/div>\n<div>\n<div>\n<div><\/div>\n<\/div>\n<\/div>\n<div><code><\/code><\/p>\n<div>\n<div>\n<div>int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<p>\u7ba1\u7406epoll\u5b9e\u4f8b\u7684\u4e8b\u4ef6\uff1a<\/p>\n<ul dir=\"auto\">\n<li>epfd\uff1aepoll\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>op\uff1a\u64cd\u4f5c\uff08EPOLL_CTL_ADD\u6dfb\u52a0\u3001EPOLL_CTL_MOD\u4fee\u6539\u3001EPOLL_CTL_DEL\u5220\u9664\uff09\u3002<\/li>\n<li>fd\uff1a\u76ee\u6807\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>event\uff1a\u6307\u5b9a\u76d1\u63a7\u4e8b\u4ef6\uff08\u5982EPOLLIN\u3001EPOLLOUT\u3001EPOLLERR\u3001EPOLLET\u7528\u4e8e\u8fb9\u7f18\u89e6\u53d1\u6a21\u5f0f\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>epoll_wait<\/strong>\uff1a\n<div dir=\"auto\">\n<div>\n<div>c<\/div>\n<div>\n<div>\n<div><\/div>\n<\/div>\n<\/div>\n<div><code><\/code><\/p>\n<div>\n<div>\n<div>int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout);<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<p>\u7b49\u5f85epoll\u5b9e\u4f8b\u4e0a\u7684\u4e8b\u4ef6\uff0c\u6700\u591a\u8fd4\u56demaxevents\u4e2a\u5c31\u7eea\u4e8b\u4ef6\u3002timeout\u4ee5\u6beb\u79d2\u4e3a\u5355\u4f4d\uff080\u8868\u793a\u7acb\u5373\u8fd4\u56de\uff0c-1\u8868\u793a\u65e0\u9650\u7b49\u5f85\uff09\u3002<\/li>\n<\/ol>\n<h4 dir=\"auto\">Epoll\u6a21\u5f0f<\/h4>\n<p dir=\"auto\">epoll\u652f\u6301\u4e24\u79cd\u89e6\u53d1\u6a21\u5f0f\uff1a<\/p>\n<ul dir=\"auto\">\n<li><strong>\u6c34\u5e73\u89e6\u53d1\uff08LT\uff09<\/strong>\uff1a\u9ed8\u8ba4\u6a21\u5f0f\u3002\u53ea\u8981\u63cf\u8ff0\u7b26\u5c31\u7eea\uff0c\u4e8b\u4ef6\u5c31\u4f1a\u88ab\u62a5\u544a\u3002\u5982\u679c\u6570\u636e\u672a\u5904\u7406\uff0cepoll_wait\u4f1a\u7ee7\u7eed\u901a\u77e5\u3002<\/li>\n<li><strong>\u8fb9\u7f18\u89e6\u53d1\uff08ET\uff09<\/strong>\uff1a\u4ec5\u5728\u63cf\u8ff0\u7b26\u72b6\u6001\u6539\u53d8\u65f6\u62a5\u544a\u4e8b\u4ef6\uff08\u4f8b\u5982\uff0c\u65b0\u6570\u636e\u5230\u8fbe\uff09\u3002\u9700\u4f7f\u7528\u975e\u963b\u585e\u5957\u63a5\u5b57\uff0c\u5e76\u5c0f\u5fc3\u5904\u7406\u4ee5\u907f\u514d\u9057\u6f0f\u4e8b\u4ef6\u3002<\/li>\n<\/ul>\n<h4 dir=\"auto\">\u793a\u4f8b\uff1a\u8fb9\u7f18\u89e6\u53d1\u6a21\u5f0f\u4e0b\u7684\u6570\u636e\u8bfb\u53d6<\/h4>\n<p dir=\"auto\">\u5728\u8fb9\u7f18\u89e6\u53d1\u6a21\u5f0f\u4e0b\uff0c\u5e94\u7528\u7a0b\u5e8f\u5fc5\u987b\u8bfb\u53d6\u6240\u6709\u53ef\u7528\u6570\u636e\u4ee5\u907f\u514d\u9057\u6f0f\u4e8b\u4ef6\u3002\u4ee5\u4e0b\u662f\u66f4\u6b63\u540e\u7684\u5b8c\u6574\u793a\u4f8b\uff1a<\/p>\n<div dir=\"auto\">\n<div>\n<div>c<\/div>\n<div>\n<div>\n<div><\/div>\n<\/div>\n<\/div>\n<div><code><\/code><\/p>\n<div>\n<div>\n<div>while (1) {<\/div>\n<div>int nread = recv(fd, buf, sizeof(buf), 0);<\/div>\n<div>if (nread &lt; 0) {<\/div>\n<div>if (errno == EAGAIN || errno == EWOULDBLOCK) {<\/div>\n<div>break; \/\/ \u65e0\u66f4\u591a\u6570\u636e<\/div>\n<div>}<\/div>\n<div>perror(&#8220;recv\u9519\u8bef&#8221;);<\/div>\n<div>close(fd);<\/div>\n<div>break;<\/div>\n<div>} else if (nread == 0) {<\/div>\n<div>\/\/ \u5bf9\u7aef\u5173\u95ed\u8fde\u63a5<\/div>\n<div>close(fd);<\/div>\n<div>break;<\/div>\n<div>}<\/div>\n<div>\/\/ \u5904\u7406nread\u5b57\u8282\u7684\u6570\u636e<\/div>\n<div>if (nread == sizeof(buf)) {<\/div>\n<div>\/\/ \u7f13\u51b2\u533a\u6ee1\uff0c\u53ef\u80fd\u8fd8\u6709\u66f4\u591a\u6570\u636e<\/div>\n<div>continue;<\/div>\n<div>}<\/div>\n<div>break;<\/div>\n<div>}<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<h4 dir=\"auto\">Epoll\u7684\u4f18\u52bf<\/h4>\n<ul dir=\"auto\">\n<li><strong>\u53ef\u6269\u5c55\u6027<\/strong>\uff1a\u652f\u6301\u6570\u5343\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08\u4ec5\u53d7\u7cfb\u7edf\u8d44\u6e90\u9650\u5236\uff0c1GB\u5185\u5b58\u673a\u5668\u4e0a\u901a\u5e38\u7ea6\u4e3a10\u4e07\uff09\u3002<\/li>\n<li><strong>\u9ad8\u6548\u6027<\/strong>\uff1a\u4f7f\u7528\u57fa\u4e8e\u56de\u8c03\u7684\u673a\u5236\uff0c\u907f\u514d\u7ebf\u6027\u626b\u63cf\u3002\u4e8b\u4ef6\u5b58\u50a8\u5728\u5185\u6838\u4e8b\u4ef6\u8868\u4e2d\uff0c\u51cf\u5c11\u7528\u6237-\u5185\u6838\u6570\u636e\u590d\u5236\u3002<\/li>\n<li><strong>\u7075\u6d3b\u6027<\/strong>\uff1a\u652f\u6301LT\u548cET\u6a21\u5f0f\uff0c\u6ee1\u8db3\u4e0d\u540c\u5e94\u7528\u9700\u6c42\u3002<\/li>\n<\/ul>\n<h4 dir=\"auto\">Epoll\u4e0eSelect\/Poll\u6bd4\u8f83<\/h4>\n<div dir=\"auto\">\n<div>\n<div><\/div>\n<\/div>\n<table dir=\"auto\" data-wide=\"false\">\n<thead>\n<tr>\n<th data-col-size=\"sm\"><strong>\u7279\u6027<\/strong><\/th>\n<th data-col-size=\"lg\"><strong>Select<\/strong><\/th>\n<th data-col-size=\"sm\"><strong>Poll<\/strong><\/th>\n<th data-col-size=\"md\"><strong>Epoll<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td data-col-size=\"sm\"><strong>\u63cf\u8ff0\u7b26\u9650\u5236<\/strong><\/td>\n<td data-col-size=\"lg\">\u9ed8\u8ba41024<\/td>\n<td data-col-size=\"sm\">\u65e0\u9650\u5236<\/td>\n<td data-col-size=\"md\">\u65e0\u9650\u5236<\/td>\n<\/tr>\n<tr>\n<td data-col-size=\"sm\"><strong>\u6027\u80fd<\/strong><\/td>\n<td data-col-size=\"lg\">O(n)\u7ebf\u6027\u626b\u63cf<\/td>\n<td data-col-size=\"sm\">O(n)\u7ebf\u6027\u626b\u63cf<\/td>\n<td data-col-size=\"md\">O(1)\u57fa\u4e8e\u56de\u8c03<\/td>\n<\/tr>\n<tr>\n<td data-col-size=\"sm\"><strong>\u6570\u636e\u590d\u5236<\/strong><\/td>\n<td data-col-size=\"lg\">\u6bcf\u6b21\u8c03\u7528\u590d\u5236<\/td>\n<td data-col-size=\"sm\">\u6bcf\u6b21\u8c03\u7528\u590d\u5236<\/td>\n<td data-col-size=\"md\">\u4e00\u6b21\u6027\u4e8b\u4ef6\u8868<\/td>\n<\/tr>\n<tr>\n<td data-col-size=\"sm\"><strong>\u89e6\u53d1\u6a21\u5f0f<\/strong><\/td>\n<td data-col-size=\"lg\">\u6c34\u5e73\u89e6\u53d1<\/td>\n<td data-col-size=\"sm\">\u6c34\u5e73\u89e6\u53d1<\/td>\n<td data-col-size=\"md\">LT\u548cET<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2 dir=\"auto\">Epoll\u7684\u5b9e\u9645\u5b9e\u73b0<\/h2>\n<p dir=\"auto\">\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u3001\u66f4\u6b63\u540e\u7684\u57fa\u4e8eepoll\u7684\u670d\u52a1\u5668\u793a\u4f8b\uff0c\u7528\u4e8e\u5904\u7406\u5ba2\u6237\u7aef\u8fde\u63a5\u3002\u8be5\u4ee3\u7801\u8bbe\u7f6e\u975e\u963b\u585e\u5957\u63a5\u5b57\uff0c\u4f7f\u7528epoll\u76d1\u63a7\uff0c\u5e76\u9ad8\u6548\u5904\u7406\u5ba2\u6237\u7aef\u6570\u636e\u3002<\/p>\n<div dir=\"auto\">\n<div>\n<div>c<\/div>\n<div>\n<div>\n<div><\/div>\n<\/div>\n<\/div>\n<div><code><\/code><\/p>\n<div>\n<div>\n<div>#include &lt;stdio.h&gt;<\/div>\n<div>#include &lt;stdlib.h&gt;<\/div>\n<div>#include &lt;string.h&gt;<\/div>\n<div>#include &lt;errno.h&gt;<\/div>\n<div>#include &lt;netinet\/in.h&gt;<\/div>\n<div>#include &lt;sys\/socket.h&gt;<\/div>\n<div>#include &lt;sys\/epoll.h&gt;<\/div>\n<div>#include &lt;fcntl.h&gt;<\/div>\n<div>#include &lt;arpa\/inet.h&gt;<\/div>\n<div>#include &lt;unistd.h&gt;<\/div>\n<div><\/div>\n<div>#define IPADDRESS &#8220;127.0.0.1&#8221;<\/div>\n<div>#define PORT 8080<\/div>\n<div>#define MAXSIZE 1024<\/div>\n<div>#define LISTENQ 5<\/div>\n<div>#define FDSIZE 1000<\/div>\n<div>#define EPOLLEVENTS 100<\/div>\n<div><\/div>\n<div>\/\/ \u8bbe\u7f6e\u5957\u63a5\u5b57\u4e3a\u975e\u963b\u585e\u6a21\u5f0f<\/div>\n<div>void set_nonblocking(int fd) {<\/div>\n<div>int flags = fcntl(fd, F_GETFL, 0);<\/div>\n<div>fcntl(fd, F_SETFL, flags | O_NONBLOCK);<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>\/\/ \u6dfb\u52a0\u4e8b\u4ef6\u5230epoll<\/div>\n<div>void add_event(int epollfd, int fd, int state) {<\/div>\n<div>struct epoll_event ev;<\/div>\n<div>ev.events = state | EPOLLET; \/\/ \u8fb9\u7f18\u89e6\u53d1<\/div>\n<div>ev.data.fd = fd;<\/div>\n<div>if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &amp;ev) == -1) {<\/div>\n<div>perror(&#8220;epoll_ctl: \u6dfb\u52a0&#8221;);<\/div>\n<div>exit(EXIT_FAILURE);<\/div>\n<div>}<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>\/\/ \u4eceepoll\u5220\u9664\u4e8b\u4ef6<\/div>\n<div>void delete_event(int epollfd, int fd, int state) {<\/div>\n<div>struct epoll_event ev;<\/div>\n<div>ev.events = state;<\/div>\n<div>ev.data.fd = fd;<\/div>\n<div>epoll_ctl(epollfd, EPOLL_CTL_DEL, fd, &amp;ev);<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>\/\/ \u4fee\u6539epoll\u4e8b\u4ef6<\/div>\n<div>void modify_event(int epollfd, int fd, int state) {<\/div>\n<div>struct epoll_event ev;<\/div>\n<div>ev.events = state | EPOLLET;<\/div>\n<div>ev.data.fd = fd;<\/div>\n<div>if (epoll_ctl(epollfd, EPOLL_CTL_MOD, fd, &amp;ev) == -1) {<\/div>\n<div>perror(&#8220;epoll_ctl: \u4fee\u6539&#8221;);<\/div>\n<div>exit(EXIT_FAILURE);<\/div>\n<div>}<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>\/\/ \u5904\u7406\u5ba2\u6237\u7aef\u8fde\u63a5<\/div>\n<div>void handle_accept(int epollfd, int listenfd) {<\/div>\n<div>struct sockaddr_in cliaddr;<\/div>\n<div>socklen_t cliaddrlen = sizeof(cliaddr);<\/div>\n<div>int clifd = accept(listenfd, (struct sockaddr*)&amp;cliaddr, &amp;cliaddrlen);<\/div>\n<div>if (clifd == -1) {<\/div>\n<div>perror(&#8220;accept\u9519\u8bef&#8221;);<\/div>\n<div>return;<\/div>\n<div>}<\/div>\n<div>printf(&#8220;\u63a5\u53d7\u5ba2\u6237\u7aef: %s:%d\\n&#8221;, inet_ntoa(cliaddr.sin_addr), ntohs(cliaddr.sin_port));<\/div>\n<div>set_nonblocking(clifd);<\/div>\n<div>add_event(epollfd, clifd, EPOLLIN);<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>\/\/ \u5904\u7406\u8bfb\u64cd\u4f5c<\/div>\n<div>void do_read(int epollfd, int fd, char *buf) {<\/div>\n<div>while (1) {<\/div>\n<div>int nread = read(fd, buf, MAXSIZE);<\/div>\n<div>if (nread == -1) {<\/div>\n<div>if (errno == EAGAIN || errno == EWOULDBLOCK) {<\/div>\n<div>break; \/\/ \u65e0\u66f4\u591a\u6570\u636e<\/div>\n<div>}<\/div>\n<div>perror(&#8220;\u8bfb\u53d6\u9519\u8bef&#8221;);<\/div>\n<div>close(fd);<\/div>\n<div>delete_event(epollfd, fd, EPOLLIN);<\/div>\n<div>break;<\/div>\n<div>} else if (nread == 0) {<\/div>\n<div>printf(&#8220;\u5ba2\u6237\u7aef\u5173\u95ed\u8fde\u63a5\\n&#8221;);<\/div>\n<div>close(fd);<\/div>\n<div>delete_event(epollfd, fd, EPOLLIN);<\/div>\n<div>break;<\/div>\n<div>}<\/div>\n<div>printf(&#8220;\u6536\u5230\u6d88\u606f: %s&#8221;, buf);<\/div>\n<div>modify_event(epollfd, fd, EPOLLOUT);<\/div>\n<div>if (nread == MAXSIZE) {<\/div>\n<div>continue; \/\/ \u53ef\u80fd\u6709\u66f4\u591a\u6570\u636e<\/div>\n<div>}<\/div>\n<div>break;<\/div>\n<div>}<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>\/\/ \u5904\u7406\u5199\u64cd\u4f5c<\/div>\n<div>void do_write(int epollfd, int fd, char *buf) {<\/div>\n<div>int nwrite = write(fd, buf, strlen(buf));<\/div>\n<div>if (nwrite == -1) {<\/div>\n<div>if (errno == EAGAIN || errno == EWOULDBLOCK) {<\/div>\n<div>return;<\/div>\n<div>}<\/div>\n<div>perror(&#8220;\u5199\u5165\u9519\u8bef&#8221;);<\/div>\n<div>close(fd);<\/div>\n<div>delete_event(epollfd, fd, EPOLLOUT);<\/div>\n<div>} else {<\/div>\n<div>modify_event(epollfd, fd, EPOLLIN);<\/div>\n<div>}<\/div>\n<div>memset(buf, 0, MAXSIZE);<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>int main() {<\/div>\n<div>int listenfd = socket(AF_INET, SOCK_STREAM, 0);<\/div>\n<div>if (listenfd == -1) {<\/div>\n<div>perror(&#8220;socket\u9519\u8bef&#8221;);<\/div>\n<div>exit(EXIT_FAILURE);<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>set_nonblocking(listenfd);<\/div>\n<div><\/div>\n<div>struct sockaddr_in servaddr;<\/div>\n<div>memset(&amp;servaddr, 0, sizeof(servaddr));<\/div>\n<div>servaddr.sin_family = AF_INET;<\/div>\n<div>servaddr.sin_addr.s_addr = inet_addr(IPADDRESS);<\/div>\n<div>servaddr.sin_port = htons(PORT);<\/div>\n<div><\/div>\n<div>if (bind(listenfd, (struct sockaddr*)&amp;servaddr, sizeof(servaddr)) == -1) {<\/div>\n<div>perror(&#8220;bind\u9519\u8bef&#8221;);<\/div>\n<div>exit(EXIT_FAILURE);<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>if (listen(listenfd, LISTENQ) == -1) {<\/div>\n<div>perror(&#8220;listen\u9519\u8bef&#8221;);<\/div>\n<div>exit(EXIT_FAILURE);<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>int epollfd = epoll_create(FDSIZE);<\/div>\n<div>if (epollfd == -1) {<\/div>\n<div>perror(&#8220;epoll_create\u9519\u8bef&#8221;);<\/div>\n<div>exit(EXIT_FAILURE);<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>add_event(epollfd, listenfd, EPOLLIN);<\/div>\n<div><\/div>\n<div>struct epoll_event events[EPOLLEVENTS];<\/div>\n<div>char buf[MAXSIZE];<\/div>\n<div>memset(buf, 0, MAXSIZE);<\/div>\n<div><\/div>\n<div>while (1) {<\/div>\n<div>int ret = epoll_wait(epollfd, events, EPOLLEVENTS, -1);<\/div>\n<div>for (int i = 0; i &lt; ret; i++) {<\/div>\n<div>int fd = events[i].data.fd;<\/div>\n<div>if (fd == listenfd &amp;&amp; (events[i].events &amp; EPOLLIN)) {<\/div>\n<div>handle_accept(epollfd, listenfd);<\/div>\n<div>} else if (events[i].events &amp; EPOLLIN) {<\/div>\n<div>do_read(epollfd, fd, buf);<\/div>\n<div>} else if (events[i].events &amp; EPOLLOUT) {<\/div>\n<div>snprintf(buf, MAXSIZE, &#8220;\u670d\u52a1\u5668\u54cd\u5e94\\n&#8221;);<\/div>\n<div>do_write(epollfd, fd, buf);<\/div>\n<div>}<\/div>\n<div>}<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>close(listenfd);<\/div>\n<div>close(epollfd);<\/div>\n<div>return 0;<\/div>\n<div>}<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<h2 dir=\"auto\">\u4f7f\u7528Epoll\u7684\u6700\u4f73\u5b9e\u8df5<\/h2>\n<ol dir=\"auto\">\n<li><strong>\u4f7f\u7528\u8fb9\u7f18\u89e6\u53d1\u6a21\u5f0f\u4ee5\u83b7\u5f97\u9ad8\u6027\u80fd<\/strong>\uff1aET\u6a21\u5f0f\u51cf\u5c11\u5197\u4f59\u901a\u77e5\uff0c\u4f46\u9700\u8981\u975e\u963b\u585e\u5957\u63a5\u5b57\u548c\u5c0f\u5fc3\u7684\u6570\u636e\u5904\u7406\u4ee5\u907f\u514d\u9057\u6f0f\u4e8b\u4ef6\u3002<\/li>\n<li><strong>\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26<\/strong>\uff1a\u59cb\u7ec8\u5173\u95edepoll\u548c\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26\u4ee5\u9632\u6b62\u8d44\u6e90\u6cc4\u6f0f\u3002<\/li>\n<li><strong>\u4f18\u5316\u4e8b\u4ef6\u5904\u7406<\/strong>\uff1a\u5728\u5355\u6b21epoll_wait\u8c03\u7528\u4e2d\u5904\u7406\u6240\u6709\u53ef\u7528\u6570\u636e\uff0c\u7279\u522b\u662f\u5728ET\u6a21\u5f0f\u4e0b\uff0c\u4ee5\u51cf\u5c11\u7cfb\u7edf\u8c03\u7528\u3002<\/li>\n<li><strong>\u76d1\u63a7\u7cfb\u7edf\u9650\u5236<\/strong>\uff1a\u68c0\u67e5\/proc\/sys\/fs\/file-max\u4ee5\u786e\u4fdd\u5927\u578b\u5e94\u7528\u6709\u8db3\u591f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li><strong>\u9519\u8bef\u5904\u7406<\/strong>\uff1a\u7a33\u5065\u5904\u7406EAGAIN\u548cEWOULDBLOCK\u7b49\u9519\u8bef\uff0c\u786e\u4fdd\u53ef\u9760\u8fd0\u884c\u3002<\/li>\n<\/ol>\n<h2 dir=\"auto\">\u7ed3\u8bba<\/h2>\n<p dir=\"auto\">epoll\u6a21\u578b\u662fLinux\u9ad8\u6027\u80fd\u7f51\u7edc\u7f16\u7a0b\u7684\u57fa\u77f3\uff0c\u63d0\u4f9bselect\u548cpoll\u65e0\u6cd5\u6bd4\u62df\u7684\u53ef\u6269\u5c55\u6027\u548c\u6548\u7387\u3002\u901a\u8fc7\u5229\u7528epoll\u7684\u57fa\u4e8e\u56de\u8c03\u7684\u673a\u5236\u548c\u8fb9\u7f18\u89e6\u53d1\u6a21\u5f0f\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u6784\u5efa\u80fd\u591f\u5904\u7406\u6570\u5343\u5e76\u53d1\u8fde\u63a5\u7684\u670d\u52a1\u5668\uff0c\u4e14\u5f00\u9500\u6781\u5c0f\u3002\u7406\u89e3epoll\u64cd\u4f5c\u6a21\u5f0f\u7684\u7ec6\u5fae\u5dee\u522b\u5e76\u6574\u5408\u7a33\u5065\u7684\u9519\u8bef\u5904\u7406\u662f\u5b9e\u73b0\u5176\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u6700\u5927\u6548\u76ca\u7684\u5173\u952e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux I\/O\u673a\u5236\u7b80\u4ecb \u5728L&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-208389","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208389","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=208389"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208389\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}