{"id":88760,"date":"2026-08-01T17:43:33","date_gmt":"2026-08-01T09:43:33","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/88760.html"},"modified":"2026-08-01T17:43:33","modified_gmt":"2026-08-01T09:43:33","slug":"%e9%ab%98%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8day8%ef%bc%88%e5%90%ab%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%ae%8c%e6%95%b4%e6%9e%b6%e6%9e%84%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/88760.html","title":{"rendered":"\u9ad8\u5e76\u53d1\u670d\u52a1\u5668day8\uff08\u542b\u670d\u52a1\u5668\u5b8c\u6574\u67b6\u6784\uff09"},"content":{"rendered":"<h2>\u6df1\u5165\u7406\u89e3 Linux \u7ebf\u7a0b\u95f4\u901a\u4fe1&#xff1a;\u4e3a\u4ec0\u4e48\u9009\u62e9 eventfd&#xff1f;<\/h2>\n<p>\u5728\u6784\u5efa\u9ad8\u5e76\u53d1\u7684\u7f51\u7edc\u670d\u52a1\u7aef\u67b6\u6784&#xff08;\u4f8b\u5982\u57fa\u4e8e Reactor \u6a21\u5f0f\u7684 EventLoop \u6a21\u5757&#xff09;\u65f6&#xff0c;\u5982\u4f55\u9ad8\u6548\u5b9e\u73b0\u7ebf\u7a0b\u95f4\u7684\u4e8b\u4ef6\u901a\u77e5\u662f\u4e00\u4e2a\u6838\u5fc3\u95ee\u9898\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u63a2\u8ba8\u4e3a\u4ec0\u4e48 eventfd \u662f\u8fd9\u79cd\u573a\u666f\u4e0b\u7684\u9996\u9009&#xff0c;\u4ee5\u53ca\u5b83\u7684\u5e95\u5c42\u673a\u5236\u4e0e\u6838\u5fc3 API\u3002<\/p>\n<h3>\u4e00\u3001 \u4e3a\u4ec0\u4e48\u4e0d\u7528\u4fe1\u53f7&#xff08;Signals&#xff09;\u6216\u4fe1\u53f7\u91cf&#xff08;Semaphores&#xff09;&#xff1f;<\/h3>\n<p>\u63d0\u5230\u7ebf\u7a0b\u95f4\u901a\u4fe1&#xff0c;\u5f88\u591a\u4eba\u7b2c\u4e00\u65f6\u95f4\u4f1a\u60f3\u5230\u4fe1\u53f7\u6216\u4fe1\u53f7\u91cf&#xff0c;\u4f46\u5728\u9ad8\u5e76\u53d1\u7f51\u7edc\u7f16\u7a0b\u4e2d&#xff0c;\u5b83\u4eec\u5b58\u5728\u660e\u663e\u7684\u5c40\u9650\u6027&#xff1a;<\/p>\n<h4>1. eventfd vs \u4fe1\u53f7 (Signals)<\/h4>\n<ul>\n<li>\n<p>\u76ee\u6807\u7ebf\u7a0b\u4e0d\u786e\u5b9a\u6027&#xff1a; \u4fe1\u53f7\u4e3b\u8981\u662f\u7528\u4e8e\u901a\u77e5\u8fdb\u7a0b\u7684\u3002\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b&#xff0c;\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u90fd\u6ca1\u6709\u5c4f\u853d\u67d0\u4e2a\u4fe1\u53f7&#xff0c;\u5f53\u4fe1\u53f7\u5230\u8fbe\u65f6&#xff0c;\u5185\u6838\u4f1a\u968f\u673a\u9009\u62e9\u4e00\u4e2a\u7ebf\u7a0b\u6765\u6267\u884c\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u3002\u8fd9\u610f\u5473\u7740\u6211\u4eec\u65e0\u6cd5\u7cbe\u51c6\u63a7\u5236\u5230\u5e95\u7531\u54ea\u4e2a\u5177\u4f53\u7684 EventLoop \u7ebf\u7a0b\u6765\u54cd\u5e94\u8fd9\u4e2a\u4e8b\u4ef6&#xff0c;\u8fd9\u5728\u5e76\u53d1\u7f51\u7edc\u67b6\u6784\u4e2d\u662f\u4e0d\u53ef\u63a5\u53d7\u7684\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e0a\u4e0b\u6587\u4e25\u82db&#xff1a; \u4fe1\u53f7\u5904\u7406\u51fd\u6570&#xff08;Signal Handler&#xff09;\u7684\u6267\u884c\u4e0a\u4e0b\u6587\u53d7\u9650\u6781\u6df1&#xff0c;\u53ea\u80fd\u8c03\u7528\u5c11\u91cf\u7684\u201c\u5f02\u6b65\u4fe1\u53f7\u5b89\u5168&#xff08;async-signal-safe&#xff09;\u201d\u51fd\u6570\u3002\u5728\u5176\u4e2d\u8fdb\u884c\u590d\u6742\u7684\u4e1a\u52a1\u903b\u8f91\u5904\u7406\u6781\u6613\u5f15\u53d1\u6b7b\u9501\u3002<\/p>\n<\/li>\n<li>\n<p>\u65e0\u6cd5\u4e0e I\/O \u591a\u8def\u590d\u7528\u7edf\u4e00\u7ba1\u7406&#xff1a; \u867d\u7136\u6709 signalfd \u8fd9\u79cd\u8865\u6551\u63aa\u65bd&#xff0c;\u4f46\u539f\u751f\u4fe1\u53f7\u673a\u5236\u672c\u8eab\u5e76\u4e0d\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;FD&#xff09;&#xff0c;\u65e0\u6cd5\u81ea\u7136\u5730\u6302\u8f7d\u5230 epoll \u4e0a\u3002<\/p>\n<\/li>\n<\/ul>\n<h4>2. eventfd vs \u4fe1\u53f7\u91cf (Semaphores)<\/h4>\n<p>\u4fe1\u53f7\u91cf&#xff08;\u5982 POSIX \u7684 sem_t&#xff09;\u7684\u6838\u5fc3\u4f5c\u7528\u662f\u540c\u6b65\u548c\u4fdd\u62a4\u4e34\u754c\u533a\u8d44\u6e90&#xff08;\u57fa\u4e8e\u8ba1\u6570\u7684\u9501\u673a\u5236&#xff09;&#xff0c;\u800c eventfd \u662f\u4e13\u4e3a\u4e8b\u4ef6\u901a\u77e5\u673a\u5236\u8bbe\u8ba1\u7684\u3002<\/p>\n<ul>\n<li>\n<p>\u662f\u5426\u4e3a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;\u6838\u5fc3\u533a\u522b&#xff09;&#xff1a; \u6807\u51c6\u7684\u4fe1\u53f7\u91cf\u4e0d\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u5728\u57fa\u4e8e epoll \u7684\u5f02\u6b65\u4e8b\u4ef6\u5faa\u73af\u4e2d&#xff0c;\u7ebf\u7a0b\u901a\u5e38\u963b\u585e\u5728 epoll_wait \u76d1\u542c\u7f51\u7edc\u4e8b\u4ef6\u3002\u56e0\u4e3a\u4fe1\u53f7\u91cf\u4e0d\u662f FD&#xff0c;\u6240\u4ee5\u65e0\u6cd5\u52a0\u5165\u5230 epoll \u7684\u76d1\u542c\u6811\u4e2d\u7edf\u4e00\u7ba1\u7406\u3002<\/p>\n<\/li>\n<li>\n<p>\u5b8c\u7f8e\u878d\u5165 EventLoop&#xff1a; eventfd \u672c\u8d28\u4e0a\u5c31\u662f\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u5b83\u53ef\u4ee5\u50cf\u666e\u901a\u7684 Socket \u4e00\u6837\u88ab\u653e\u5165 epoll\u3002\u5f53\u5176\u5b83\u7ebf\u7a0b\u5199\u5165\u6570\u636e\u65f6&#xff0c;\u76ee\u6807\u7ebf\u7a0b\u7684 epoll_wait \u4f1a\u88ab\u4f18\u96c5\u5730\u5524\u9192&#xff0c;\u5b9e\u73b0\u4e86\u7f51\u7edc I\/O \u548c\u8de8\u7ebf\u7a0b\u4e8b\u4ef6\u901a\u77e5\u7684\u65e0\u7f1d\u7edf\u4e00\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u4e8c\u3001 eventfd \u6838\u5fc3\u673a\u5236\u4e0e\u539f\u7406<\/h3>\n<p>eventfd \u662f\u4e00\u79cd\u6781\u5176\u8f7b\u91cf\u7ea7\u7684\u4e8b\u4ef6\u901a\u77e5\u673a\u5236\u3002\u5b83\u7684\u672c\u8d28\u662f\u5728\u5185\u6838\u7a7a\u95f4\u7ba1\u7406\u7684\u4e00\u4e2a 64 \u4f4d\u65e0\u7b26\u53f7\u8ba1\u6570\u5668 (Counter)\u3002<\/p>\n<ul>\n<li>\n<p>\u521b\u5efa\u4e0e\u5206\u914d&#xff1a; \u521b\u5efa\u4e00\u4e2a eventfd \u65f6&#xff0c;\u5185\u6838\u5c31\u4f1a\u5728\u5e95\u5c42\u4e3a\u5176\u5206\u914d\u8fd9\u4e2a\u8ba1\u6570\u5668\u7ed3\u6784\u3002<\/p>\n<\/li>\n<li>\n<p>\u5199\u5165\u5373\u7d2f\u52a0&#xff1a; \u6bcf\u5f53\u5411 eventfd \u4e2d\u5199\u5165\u4e00\u4e2a\u6570\u503c&#xff0c;\u8be5\u6570\u503c\u4f1a\u88ab\u7d2f\u52a0\u5230\u5185\u6838\u7684\u8ba1\u6570\u5668\u4e0a&#xff0c;\u7528\u4e8e\u8868\u793a\u4e8b\u4ef6\u901a\u77e5\u7684\u53d1\u751f\u6b21\u6570\u3002<\/p>\n<\/li>\n<li>\n<p>\u8bfb\u53d6\u5373\u6e05\u96f6&#xff1a; \u4f7f\u7528 read \u8fdb\u884c\u6570\u636e\u8bfb\u53d6\u65f6&#xff0c;\u8bfb\u53d6\u5230\u7684\u5c31\u662f\u5f53\u524d\u901a\u77e5\u7684\u603b\u6b21\u6570\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b&#xff0c;\u8bfb\u53d6\u6210\u529f\u540e\u5185\u6838\u4f1a\u81ea\u52a8\u5c06\u8ba1\u6570\u5668\u6e05\u96f6\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u793a\u4f8b\u63a8\u6f14&#xff1a;<\/p>\n<p>\u5047\u8bbe\u6bcf\u6b21\u7ed9 eventfd \u4e2d\u5199\u5165\u4e00\u4e2a 1 \u8868\u793a\u89e6\u53d1\u4e86\u4e00\u6b21\u901a\u77e5\u3002\u5982\u679c\u8fde\u7eed\u5199\u4e86\u4e09\u6b21 1&#xff0c;\u5185\u6838\u8ba1\u6570\u5668\u53d8\u4e3a 3\u3002\u6b64\u65f6\u8c03\u7528 read \u8bfb\u53d6\u51fa\u6765\u7684\u6570\u5b57\u5c31\u662f 3&#xff0c;\u8bfb\u53d6\u4e4b\u540e\u8ba1\u6570\u7acb\u523b\u6e05\u96f6\u91cd\u7f6e\u3002<\/p>\n<h3>\u4e09\u3001 \u6838\u5fc3 API \u89e3\u6790<\/h3>\n<p>\u4f7f\u7528 eventfd \u8fdb\u884c\u5f00\u53d1&#xff0c;\u9700\u8981\u5f15\u5165\u7279\u5b9a\u7684\u7cfb\u7edf\u5934\u6587\u4ef6 &lt;sys\/eventfd.h&gt;\u3002<\/p>\n<p>\u51fd\u6570\u539f\u578b&#xff1a;<\/p>\n<p>int eventfd(unsigned int initval, int flags);<\/p>\n<table>\n<tr>\n<td>\u53c2\u6570 \/ \u5c5e\u6027<\/td>\n<td>\u8be6\u7ec6\u8bf4\u660e<\/td>\n<\/tr>\n<tbody>\n<tr>\n<td>initval<\/td>\n<td>\u8ba1\u6570\u521d\u503c&#xff1a;\u901a\u5e38\u8bbe\u4e3a 0\u3002<\/td>\n<\/tr>\n<tr>\n<td>flags<\/td>\n<td>\n<p>\u884c\u4e3a\u6807\u5fd7\u4f4d&#xff1a;<\/p>\n<p>\u00a0<\/p>\n<p>\u2022 EFD_CLOEXEC&#xff1a;\u7981\u6b62\u8fdb\u7a0b\u5728\u6267\u884c exec \u65f6\u590d\u5236\u8be5\u63cf\u8ff0\u7b26&#xff08;\u9632\u6b62\u5b50\u8fdb\u7a0b\u610f\u5916\u7ee7\u627f&#xff09;\u3002<\/p>\n<p>\u00a0<\/p>\n<p>\u2022 EFD_NONBLOCK&#xff1a;\u542f\u7528\u975e\u963b\u585e\u5c5e\u6027\u3002\u5728\u642d\u914d epoll \u4f7f\u7528\u65f6\u5fc5\u987b\u5f00\u542f&#xff0c;\u9632\u6b62\u8bfb\u5199\u64cd\u4f5c\u963b\u585e\u6574\u4e2a\u7ebf\u7a0b\u3002<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\u8fd4\u56de\u503c<\/td>\n<td>\u6210\u529f\u5219\u8fd4\u56de\u4e00\u4e2a\u5168\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 (fd)&#xff0c;\u7528\u4e8e\u540e\u7eed\u64cd\u4f5c&#xff1b;\u5931\u8d25\u5219\u8fd4\u56de -1\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>I\/O \u64cd\u4f5c\u7ea6\u675f&#xff1a;<\/p>\n<p>eventfd \u4e5f\u662f\u901a\u8fc7\u6807\u51c6\u7684 read\u3001write\u3001close \u51fd\u6570\u8fdb\u884c\u64cd\u4f5c\u7684&#xff0c;\u4f46\u5fc5\u987b\u4e25\u683c\u9075\u5b88\u5e95\u5c42\u6570\u636e\u89c4\u8303&#xff1a;<\/p>\n<ul>\n<li>\n<p>8 \u5b57\u8282\u5b9a\u957f\u9650\u5236&#xff1a; \u5728\u8fdb\u884c I\/O \u8bfb\u5199\u65f6&#xff0c;\u4f20\u9012\u7684\u6570\u636e\u5bf9\u8c61&#xff08;Buffer&#xff09;\u53ea\u80fd\u662f\u4e00\u4e2a 8 \u5b57\u8282\u7684\u6570\u636e&#xff08;\u5373 uint64_t&#xff09;\u3002\u5982\u679c\u63d0\u4f9b\u7684\u6570\u636e\u5757\u5927\u5c0f\u4e0d\u5bf9&#xff0c;\u8bfb\u5199\u64cd\u4f5c\u5c06\u4f1a\u62a5\u9519&#xff08;EINVAL&#xff09;\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u56db\u3001 \u6838\u5fc3\u7528\u5904\u603b\u7ed3<\/h3>\n<p>eventfd \u6700\u5178\u578b\u7684\u5e94\u7528\u573a\u666f\u5728\u4e8e&#xff1a;\u5728 EventLoop \u6a21\u5757\u4e2d\u5b9e\u73b0\u7ebf\u7a0b\u95f4\u7684\u4e8b\u4ef6\u901a\u77e5\u529f\u80fd\u3002<\/p>\n<p>\u5728\u4e3b\u4ece Reactor \u7f51\u7edc\u6a21\u578b\u4e2d&#xff0c;\u4e3b\u7ebf\u7a0b&#xff08;Acceptor&#xff09;\u5728\u63a5\u6536\u5230\u65b0\u8fde\u63a5\u6216\u5206\u6d3e\u4efb\u52a1\u540e&#xff0c;\u9700\u8981\u8de8\u7ebf\u7a0b\u5524\u9192\u5904\u4e8e\u4f11\u7720\u7b49\u5f85&#xff08;epoll_wait&#xff09;\u72b6\u6001\u7684\u5b50\u7ebf\u7a0b&#xff08;Worker&#xff09;\u3002\u4e3b\u7ebf\u7a0b\u53ea\u9700\u5411\u5b50\u7ebf\u7a0b\u7ed1\u5b9a\u7684 eventfd \u4e2d\u5199\u5165\u4e00\u4e2a 8 \u5b57\u8282\u7684\u503c&#xff0c;\u5b50\u7ebf\u7a0b\u7684\u4e8b\u4ef6\u5faa\u73af\u5c31\u80fd\u7acb\u523b\u88ab\u5524\u9192\u5e76\u63a5\u7ba1\u4efb\u52a1\u3002\u8fd9\u79cd\u673a\u5236\u76f8\u6bd4\u4f7f\u7528\u7ba1\u9053&#xff08;Pipe&#xff09;\u9700\u8981\u4e24\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u4e0d\u4ec5\u8282\u7701\u8d44\u6e90&#xff08;\u53ea\u9700\u4e00\u4e2a fd&#xff09;&#xff0c;\u800c\u4e14\u6027\u80fd\u5f00\u9500\u6781\u4f4e\u3002<\/p>\n<hr \/>\n<h2>\u6df1\u5165\u7406\u89e3Reactor\u67b6\u6784&#xff1a;EventLoop\u4e0e\u8fde\u63a5\u7684\u7ebf\u7a0b\u7ed1\u5b9a\u53ca\u5b89\u5168\u4fdd\u969c<\/h2>\n<p>\u5728\u9ad8\u6027\u80fd\u5e76\u53d1\u7f51\u7edc\u670d\u52a1\u5668\u7684\u5f00\u53d1\u4e2d&#xff0c;\u4fdd\u8bc1\u5355\u8fde\u63a5&#xff08;Channel\/Connection&#xff09;\u7684\u7ebf\u7a0b\u5b89\u5168\u662f\u67b6\u6784\u8bbe\u8ba1\u7684\u6838\u5fc3\u6311\u6218\u4e4b\u4e00\u3002\u5f53\u6211\u4eec\u901a\u8fc7\u5916\u90e8\u7ebf\u7a0b\u6c60\u5bf9\u4efb\u52a1\u8fdb\u884c\u5206\u644a\u65f6&#xff0c;\u5982\u4f55\u786e\u4fdd\u4e00\u4e2a\u8fde\u63a5\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u4e25\u683c\u6536\u655b\u5728\u540c\u4e00\u4e2a\u7ebf\u7a0b\u5185&#xff1f;<\/p>\n<p>\u672c\u6587\u5c06\u8be6\u7ec6\u68b3\u7406\u201cEventLoop\u4e0e\u7ebf\u7a0b\u4e00\u4e00\u7ed1\u5b9a\u201d\u7684\u8bbe\u8ba1\u903b\u8f91&#xff0c;\u4ee5\u53ca\u5982\u4f55\u5229\u7528\u4efb\u52a1\u961f\u5217&#xff08;Task Queue&#xff09;\u5b9e\u73b0\u65e0\u9501\u5316\u3001\u9ad8\u5b89\u5168\u7684\u8fde\u63a5\u64cd\u4f5c\u3002<\/p>\n<h3>1. \u6838\u5fc3\u75db\u70b9&#xff1a;\u591a\u7ebf\u7a0b\u4e0b\u7684\u63cf\u8ff0\u7b26\u64cd\u4f5c\u5b89\u5168<\/h3>\n<p>\u5728 Reactor \u6a21\u578b\u4e2d&#xff0c;EventLoop \u8d1f\u8d23\u4e8b\u4ef6\u7684\u76d1\u63a7\u4e0e\u5904\u7406\u3002\u5982\u679c\u4e00\u4e2a\u8fde\u63a5\u7684\u63cf\u8ff0\u7b26\u5728\u591a\u4e2a\u7ebf\u7a0b\u4e2d\u540c\u65f6\u89e6\u53d1\u4e8b\u4ef6\u5e76\u88ab\u5904\u7406&#xff0c;\u6216\u8005\u5916\u90e8\u7ebf\u7a0b\u6c60\u5728\u4e1a\u52a1\u5904\u7406\u540e\u76f4\u63a5\u5411\u8be5\u8fde\u63a5\u5199\u5165\u6570\u636e&#xff0c;\u5c31\u4f1a\u5f15\u53d1\u4e25\u91cd\u7684\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u3002<\/p>\n<p>\u8bbe\u8ba1\u51c6\u5219&#xff1a;\u5fc5\u987b\u5c06\u4e00\u4e2a\u8fde\u63a5\u7684\u4e8b\u4ef6\u76d1\u63a7\u3001\u4e8b\u4ef6\u5904\u7406\u53ca\u5176\u4ed6\u4e00\u5207\u6d89\u53ca\u8fde\u63a5\u7684\u64cd\u4f5c&#xff0c;\u5168\u90e8\u9650\u5236\u5728\u540c\u4e00\u4e2a EventLoop \u5bf9\u5e94\u7684\u7ebf\u7a0b\u4e2d\u8fdb\u884c\u3002<\/p>\n<h3>2. \u89e3\u51b3\u65b9\u6848&#xff1a;\u5f15\u5165 Task Queue (\u4efb\u52a1\u961f\u5217)<\/h3>\n<p>\u4e3a\u4e86\u5b9e\u73b0\u4e0a\u8ff0\u51c6\u5219&#xff0c;\u53ef\u4ee5\u5728 Channel \u6a21\u5757\u4e2d\u5c06\u5e95\u5c42\u7684 poller \u66ff\u6362\u4e3a EventLoop&#xff0c;\u4ece\u800c\u5c06\u8fde\u63a5\u5f7b\u5e95\u4e0e\u5bf9\u5e94\u7684 EventLoop \u7ebf\u7a0b\u7ed1\u5b9a\u3002<\/p>\n<p>\u5728\u6b64\u57fa\u7840\u4e0a&#xff0c;\u4e3a EventLoop \u6a21\u5757\u6dfb\u52a0\u4e00\u4e2a\u4efb\u52a1\u961f\u5217&#xff08;Task Queue&#xff09;\u3002<\/p>\n<p>\u6838\u5fc3\u601d\u60f3&#xff1a;\u5bf9\u8fde\u63a5\u7684\u6240\u6709\u64cd\u4f5c&#xff08;\u5982 send \u53d1\u9001\u6570\u636e&#xff09;\u90fd\u8fdb\u884c\u4e00\u5c42\u5c01\u88c5\u3002\u4e0d\u76f4\u63a5\u6267\u884c\u8fd9\u4e9b\u64cd\u4f5c&#xff0c;\u800c\u662f\u5c06\u5176\u4f5c\u4e3a\u201c\u4efb\u52a1&#xff08;Task&#xff09;\u201d\u538b\u5165\u4efb\u52a1\u961f\u5217\u4e2d&#xff0c;\u7531 EventLoop \u7ebf\u7a0b\u7edf\u4e00\u8c03\u5ea6\u6267\u884c\u3002<\/p>\n<h3>3. \u67b6\u6784\u539f\u7406\u89e3\u6790 (\u6d41\u7a0b\u56fe\u89e3)<\/h3>\n<p>[ EventLoop \u7ebf\u7a0b (\u5355\u7ebf\u7a0b\u95ed\u73af) ]<br \/>\n       \u2502<br \/>\n       \u251c\u2500\u25ba [ epoll (\u4e8b\u4ef6\u76d1\u63a7) ] \u2500\u2500(1. I\/O\u4e8b\u4ef6\u5c31\u7eea)\u2500\u2500\u2510<br \/>\n       \u2502                                           \u25bc<br \/>\n       \u2502                                 [ \u8c03\u7528\u56de\u8c03\u51fd\u6570\u5904\u7406\u4e8b\u4ef6 ]<br \/>\n       \u2502                                 [ \u4e1a\u52a1\u903b\u8f91\u8c03\u7528 send()  ]<br \/>\n       \u2502                                           \u2502<br \/>\n       \u2502                                 (2. \u62e6\u622a\u5e76\u5c01\u88c5\u4e3a Task)<br \/>\n       \u2502                                           \u25bc<br \/>\n       \u251c\u2500\u25ba [ Task Queue (\u4efb\u52a1\u961f\u5217) ] \u25c4\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n       \u2502           \u2502<br \/>\n       \u2502           \u25bc<br \/>\n       \u2514\u2500\u25ba (3. \u6240\u6709\u5c31\u7eea\u4e8b\u4ef6\u5904\u7406\u5b8c\u6bd5\u540e&#xff0c;\u7edf\u4e00\u53d6\u51fa Task \u5e76\u5b9e\u9645\u6267\u884c)<\/p>\n<h3>4. EventLoop \u7684\u6807\u51c6\u5904\u7406\u6d41\u7a0b<\/h3>\n<p>\u5728\u5f15\u5165\u4efb\u52a1\u961f\u5217\u540e&#xff0c;EventLoop \u5355\u6b21\u5faa\u73af\u7684\u5904\u7406\u6d41\u7a0b\u53ef\u6807\u51c6\u5316\u4e3a\u4ee5\u4e0b\u4e09\u4e2a\u6b65\u9aa4&#xff1a;<\/p>\n<li>\n<p>\u4e8b\u4ef6\u76d1\u63a7&#xff1a;\u5728 EventLoop \u6240\u5728\u7ebf\u7a0b\u4e2d&#xff0c;\u901a\u8fc7 epoll \u5bf9\u7ba1\u7406\u7684\u6240\u6709\u63cf\u8ff0\u7b26\u8fdb\u884c\u4e8b\u4ef6\u76d1\u63a7\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e8b\u4ef6\u5904\u7406&#xff1a;\u5f53\u63cf\u8ff0\u7b26\u5c31\u7eea\u65f6&#xff0c;\u8c03\u7528\u5bf9\u5e94\u7684\u56de\u8c03\u51fd\u6570\u8fdb\u884c\u5904\u7406\u3002\u5982\u679c\u5904\u7406\u8fc7\u7a0b\u4e2d&#xff08;\u6216\u5916\u90e8\u4e1a\u52a1\u7ebf\u7a0b\u4e2d&#xff09;\u89e6\u53d1\u4e86\u8bf7\u6c42&#xff0c;\u8fd9\u4e9b\u64cd\u4f5c\u4f1a\u88ab\u62e6\u622a\u5e76\u5c01\u88c5&#xff0c;\u76f4\u63a5\u538b\u5165\u4efb\u52a1\u961f\u5217&#xff0c;\u800c\u975e\u7acb\u5373\u6267\u884c\u3002<\/p>\n<\/li>\n<li>\n<p>\u6267\u884c\u4efb\u52a1&#xff1a;\u5f53\u672c\u6b21\u6240\u6709\u7684\u5c31\u7eea I\/O \u4e8b\u4ef6\u90fd\u5904\u7406\u5b8c\u6bd5\u540e&#xff0c;\u518d\u53bb\u904d\u5386\u4efb\u52a1\u961f\u5217&#xff0c;\u5c06\u961f\u5217\u4e2d\u7684\u6240\u6709\u4efb\u52a1\u4f9d\u6b21\u53d6\u51fa\u5e76\u5b9e\u9645\u6267\u884c\u3002<\/p>\n<\/li>\n<h3>5. \u7ebf\u7a0b\u5b89\u5168\u4fdd\u969c\u5206\u6790<\/h3>\n<table>\n<tr>\n<td>\u64cd\u4f5c\u573a\u666f<\/td>\n<td>\u7ebf\u7a0b\u5b89\u5168\u4fdd\u969c\u673a\u5236<\/td>\n<\/tr>\n<tbody>\n<tr>\n<td>\u8fde\u63a5\u7684 I\/O \u64cd\u4f5c<\/td>\n<td>\u6240\u6709\u771f\u6b63\u7684 I\/O \u64cd\u4f5c&#xff08;\u8bfb\u3001\u5199&#xff09;\u5747\u5728\u7edf\u4e00\u7684 EventLoop \u7ebf\u7a0b\u4e2d\u96c6\u4e2d\u6267\u884c&#xff0c;\u5929\u7136\u65e0\u9501\u4e14\u4e25\u683c\u7ebf\u7a0b\u5b89\u5168\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u5916\u90e8\u7ebf\u7a0b\u6295\u9012\u4efb\u52a1<\/td>\n<td>\u5916\u90e8\u7ebf\u7a0b\u6c60\u5411 Task Queue \u538b\u5165\u4efb\u52a1\u65f6&#xff0c;\u5b58\u5728\u591a\u7ebf\u7a0b\u7ade\u4e89\u5165\u961f\u7684\u60c5\u51b5\u3002\u56e0\u6b64&#xff0c;\u53ea\u9700\u5bf9 Task \u961f\u5217\u7684\u64cd\u4f5c\u52a0\u4e00\u628a\u4e92\u65a5\u9501&#xff08;Mutex&#xff09;\u5373\u53ef&#xff0c;\u907f\u514d\u4e86\u5bf9\u4e1a\u52a1\u903b\u8f91\u52a0\u9501&#xff0c;\u5927\u5e45\u964d\u4f4e\u4e86\u5e76\u53d1\u51b2\u7a81\u7684\u7c92\u5ea6\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6574\u4e2a\u670d\u52a1\u5668\u5b8c\u6574\u67b6\u6784&#xff1a;<\/p>\n<p>[ \u5ba2\u6237\u7aef\u7fa4 ]<br \/>\n    \u2502 (\u53d1\u8d77\u8fde\u63a5)<br \/>\n    \u25bc<br \/>\n\u3010 \u7b2c\u4e00\u5c42&#xff1a;\u4e3b EventLoop \u7ebf\u7a0b \u3011(\u53ea\u8d1f\u8d23 Accept&#xff0c;\u50cf\u8fce\u5bbe\u5458)<br \/>\n    \u2502 (\u6309\u8f6e\u8be2\u89c4\u5219&#xff0c;\u628a\u8fde\u63a5\u6254\u7ed9\u540e\u9762\u7684\u67d0\u4e00\u4e2a IO \u7ebf\u7a0b)<br \/>\n    \u251c\u2500\u2500\u25ba \u6254\u7ed9 IO \u7ebf\u7a0b 1<br \/>\n    \u251c\u2500\u2500\u25ba \u6254\u7ed9 IO \u7ebf\u7a0b 2  &lt;\u2500\u2500 (\u5047\u8bbe\u8fde\u63a5A\u5206\u914d\u5230\u4e86\u8fd9\u91cc&#xff0c;\u5f7b\u5e95\u7ed1\u5b9a&#xff01;)<br \/>\n    \u2514\u2500\u2500\u25ba \u6254\u7ed9 IO \u7ebf\u7a0b 3<br \/>\n           \u2502<br \/>\n           \u25bc (\u5ba2\u6237\u7aef\u53d1\u6765\u6570\u636e&#xff0c;IO \u7ebf\u7a0b 2 \u8bfb\u51fa\u6570\u636e)<br \/>\n           \u2502<br \/>\n\u3010 \u7b2c\u4e09\u5c42&#xff1a;\u4e1a\u52a1\u7ebf\u7a0b\u6c60 \u3011(\u8d1f\u8d23\u8017\u65f6\u8ba1\u7b97&#xff0c;\u50cf\u540e\u53a8)<br \/>\n           \u2502<br \/>\n           \u25bc (\u4e1a\u52a1\u7ebf\u7a0b\u7b97\u5b8c\u7ed3\u679c&#xff0c;\u751f\u6210\u53d1\u9001\u4efb\u52a1)<br \/>\n           \u2502<br \/>\n\u3010 \u95ed\u73af&#xff1a;\u6254\u56de\u539f\u672c\u7684 IO \u7ebf\u7a0b\u4efb\u52a1\u961f\u5217 \u3011<br \/>\n      \u5c06\u4efb\u52a1\u7cbe\u51c6\u585e\u56de \u3010IO \u7ebf\u7a0b 2 \u7684 Task Queue\u3011<br \/>\n      (IO \u7ebf\u7a0b 2 \u88ab\u94c3\u94db\u5524\u9192&#xff0c;\u4eb2\u81ea\u6267\u884c send \u52a8\u4f5c)<\/p>\n<h3>6. \u81f4\u547d\u9690\u60a3&#xff1a;\u4efb\u52a1\u961f\u5217\u88ab\u201c\u997f\u6b7b\u201d\u7684\u963b\u585e\u95ee\u9898<\/h3>\n<p>\u5728\u524d\u6587\u7684\u6807\u51c6\u5904\u7406\u6d41\u7a0b\u4e2d&#xff0c;\u6211\u4eec\u660e\u786e\u4e86 EventLoop \u7684\u4e24\u5927\u6838\u5fc3\u4efb\u52a1&#xff1a;1. \u76d1\u63a7\u5e76\u5904\u7406 I\/O \u4e8b\u4ef6&#xff08;\u4f7f\u7528 Poller \u6a21\u5757&#xff09;&#xff1b;2. \u6267\u884c\u7ebf\u7a0b\u5b89\u5168\u4efb\u52a1\u961f\u5217\u4e2d\u7684\u4efb\u52a1\u3002<\/p>\n<p>\u4f46\u8fd9\u5957\u6d41\u7a0b\u5728\u5b9e\u9645\u8fd0\u884c\u4e2d\u5b58\u5728\u4e00\u4e2a\u6781\u6613\u88ab\u5ffd\u89c6\u7684\u903b\u8f91\u9690\u60a3&#xff1a;\u6267\u884c\u6d41\u963b\u585e\u5bfc\u81f4\u4efb\u52a1\u5ef6\u8fdf\u3002<\/p>\n<p>\u573a\u666f\u91cd\u73b0&#xff1a;<\/p>\n<p>\u5047\u8bbe\u5916\u90e8\u7ebf\u7a0b\u6c60\u521a\u5904\u7406\u5b8c\u5927\u91cf\u4e1a\u52a1&#xff0c;\u5411 EventLoop \u7684\u4efb\u52a1\u961f\u5217\u538b\u5165\u4e86\u4e00\u5806\u5f85\u53d1\u9001\u7684\u4efb\u52a1\u3002\u4f46\u6781\u5176\u4e0d\u5de7\u7684\u662f&#xff0c;\u6b64\u65f6 EventLoop \u76d1\u542c\u7684\u6240\u6709\u7f51\u7edc\u63cf\u8ff0\u7b26\u90fd\u6ca1\u6709\u4efb\u4f55 I\/O \u4e8b\u4ef6\u53d1\u751f\u3002<\/p>\n<p>\u8fd9\u79cd\u60c5\u51b5\u4e0b&#xff0c;EventLoop \u7ebf\u7a0b\u4f1a\u4e00\u76f4\u963b\u585e\u5728\u5e95\u5c42\u7684\u4e8b\u4ef6\u76d1\u63a7\u5904&#xff08;\u4f8b\u5982 epoll_wait \u5904\u6b7b\u7b49&#xff09;\u3002\u65e2\u7136\u4ee3\u7801\u6267\u884c\u6d41\u65e0\u6cd5\u5411\u4e0b\u63a8\u8fdb&#xff0c;\u4efb\u52a1\u961f\u5217\u4e2d\u5806\u79ef\u7684\u4efb\u52a1\u81ea\u7136\u5c31\u5f97\u4e0d\u5230\u6267\u884c&#xff0c;\u88ab\u5f7b\u5e95\u201c\u997f\u6b7b\u201d\u3002<\/p>\n<h3>7. \u7ec8\u6781\u95ed\u73af&#xff1a;\u5f15\u5165\u4e8b\u4ef6\u5524\u9192\u673a\u5236 (Wakeup)<\/h3>\n<p>\u4e3a\u4e86\u6253\u7834\u4e0a\u8ff0\u963b\u585e\u6b7b\u5c40&#xff0c;\u907f\u514d\u4efb\u52a1\u88ab\u65e0\u9650\u5236\u6401\u7f6e&#xff0c;\u6211\u4eec\u5fc5\u987b\u4e3a EventLoop \u5f15\u5165\u4e00\u4e2a\u80fd\u591f\u4e3b\u52a8\u5524\u9192\u4e8b\u4ef6\u76d1\u63a7\u7684\u901a\u77e5\u673a\u5236\u3002<\/p>\n<p>\u6838\u5fc3\u89e3\u51b3\u601d\u8def&#xff1a;<\/p>\n<p>\u4e0d\u80fd\u8ba9 EventLoop \u4ec5\u4ec5\u88ab\u52a8\u7b49\u5f85\u7f51\u7edc\u8fde\u63a5\u7684\u6570\u636e\u3002\u5916\u90e8\u7ebf\u7a0b\u5728\u6295\u9012\u4efb\u52a1\u540e&#xff0c;\u5fc5\u987b\u6709\u80fd\u529b\u5f3a\u884c\u201c\u53eb\u9192\u201d\u6c89\u7761\u7684 EventLoop\u3002\u5728 Linux \u7cfb\u7edf\u4e2d&#xff0c;\u8fd9\u901a\u5e38\u901a\u8fc7 eventfd \u6216\u672c\u5730\u7684 socketpair \u6765\u5b9e\u73b0\u3002<\/p>\n<li>\n<p>\u4e13\u5c5e\u5524\u9192\u901a\u9053&#xff1a;\u7ed9 EventLoop \u5206\u914d\u4e00\u4e2a\u7279\u6b8a\u7684\u201c\u4e8b\u4ef6\u901a\u77e5\u63cf\u8ff0\u7b26\u201d&#xff0c;\u5e76\u540c\u6837\u4ea4\u7ed9 Poller \u53bb\u76d1\u63a7\u3002<\/p>\n<\/li>\n<li>\n<p>\u8de8\u7ebf\u7a0b\u6447\u94c3&#xff1a;\u5f53\u5916\u90e8\u7ebf\u7a0b\u5411\u4efb\u52a1\u961f\u5217\u538b\u5165\u65b0\u4efb\u52a1\u540e&#xff0c;\u7d27\u63a5\u7740\u5411\u8fd9\u4e2a\u901a\u77e5\u63cf\u8ff0\u7b26\u5199\u5165\u4e00\u70b9\u6570\u636e&#xff08;\u76f8\u5f53\u4e8e\u6309\u54cd\u4e86\u5524\u9192\u94c3\u94db&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u77ac\u95f4\u89e3\u9664\u963b\u585e&#xff1a;Poller \u76d1\u63a7\u5230\u901a\u77e5\u63cf\u8ff0\u7b26\u6709\u8bfb\u4e8b\u4ef6\u5c31\u7eea&#xff0c;\u7acb\u523b\u7ed3\u675f\u963b\u585e\u72b6\u6001\u3002EventLoop \u987a\u7406\u6210\u7ae0\u5730\u8fdb\u5165\u4e0b\u4e00\u6b65&#xff0c;\u5904\u7406\u5b8c\u4e8b\u4ef6\u540e&#xff0c;\u5373\u53ef\u987a\u5229\u6267\u884c\u4efb\u52a1\u961f\u5217\u4e2d\u7684\u4efb\u52a1\u3002<\/p>\n<\/li>\n<p>\u4f18\u5316\u540e\u7684 EventLoop \u5b8c\u6574\u6267\u884c\u6d41\u8f6c\u8868&#xff1a;<\/p>\n<table>\n<tr>\n<td>\u6267\u884c\u9636\u6bb5<\/td>\n<td>\u6838\u5fc3\u6a21\u5757\/\u64cd\u4f5c<\/td>\n<td>\u8fd0\u884c\u903b\u8f91\u4e0e\u673a\u5236\u4fdd\u969c<\/td>\n<\/tr>\n<tbody>\n<tr>\n<td>1. \u4e8b\u4ef6\u76d1\u63a7<\/td>\n<td>Poller \u6a21\u5757<\/td>\n<td>\u963b\u585e\u7b49\u5f85\u6240\u6709\u63cf\u8ff0\u7b26\u7684 I\/O \u4e8b\u4ef6\u5c31\u7eea\u3002\u76d1\u63a7\u5bf9\u8c61\u4e0d\u4ec5\u5305\u542b\u7f51\u7edc\u8fde\u63a5&#xff0c;\u5fc5\u987b\u989d\u5916\u5305\u542b\u4e00\u4e2a\u4e13\u5c5e\u7684\u4e8b\u4ef6\u5524\u9192\u63cf\u8ff0\u7b26\u3002<\/td>\n<\/tr>\n<tr>\n<td>2. \u4e8b\u4ef6\u5904\u7406<\/td>\n<td>\u89e6\u53d1\u56de\u8c03<\/td>\n<td>\u53d1\u73b0\u5c31\u7eea\u4e8b\u4ef6\u5219\u8fdb\u884c\u5904\u7406\u3002\u82e5\u662f\u7f51\u7edc\u63cf\u8ff0\u7b26&#xff0c;\u8d70\u6b63\u5e38\u7684\u6536\u53d1\u903b\u8f91&#xff1b;\u82e5\u662f\u5524\u9192\u63cf\u8ff0\u7b26&#xff0c;\u53ea\u9700\u8bfb\u51fa\u6570\u636e\u6e05\u7a7a\u7f13\u51b2\u533a\u5373\u53ef&#xff08;\u76ee\u7684\u4ec5\u5728\u4e8e\u89e3\u9664 Poller \u7684\u963b\u585e&#xff09;\u3002<\/td>\n<\/tr>\n<tr>\n<td>3. \u4efb\u52a1\u6267\u884c<\/td>\n<td>Task Queue<\/td>\n<td>\u904d\u5386\u5e76\u6267\u884c\u7ebf\u7a0b\u5b89\u5168\u4efb\u52a1\u961f\u5217\u4e2d\u7684\u6240\u6709\u4efb\u52a1\u3002\u5f97\u76ca\u4e8e\u5524\u9192\u673a\u5236&#xff0c;\u5916\u90e8\u7ebf\u7a0b\u6295\u9012\u4efb\u52a1\u540e&#xff0c;\u6b64\u5904\u5fc5\u5b9a\u80fd\u88ab\u5373\u523b\u8c03\u5ea6\u6267\u884c&#xff0c;\u5b9e\u73b0\u9ad8\u5b9e\u65f6\u6027\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>8.\u4e3a\u4ec0\u4e48\u91c7\u7528 Vector \u7f6e\u6362 (Swap) \u800c\u975e\u76f4\u63a5\u52a0\u9501\u6267\u884c&#xff1f;<\/h3>\n<p>\u5728\u5904\u7406\u4efb\u52a1\u961f\u5217\u65f6&#xff0c;\u7ecf\u5e38\u4f1a\u4ea7\u751f\u4e00\u4e2a\u7591\u95ee&#xff1a;\u4e3a\u4ec0\u4e48\u8981\u628a\u4efb\u52a1\u4ece\u539f\u961f\u5217&#xff08;Vector A&#xff09;\u7f6e\u6362&#xff08;Swap&#xff09;\u5230\u4e00\u4e2a\u5c40\u90e8\u7684\u4e34\u65f6\u961f\u5217&#xff08;Vector B&#xff09;\u518d\u53bb\u6267\u884c&#xff0c;\u800c\u4e0d\u662f\u76f4\u63a5\u52a0\u9501&#xff0c;\u4e00\u53e3\u6c14\u628a\u539f\u961f\u5217\u91cc\u7684\u4efb\u52a1\u6267\u884c\u5b8c\u518d\u89e3\u9501\u6e05\u7a7a&#xff1f;<\/p>\n<p>\u5982\u679c\u91c7\u7528\u201c\u76f4\u63a5\u52a0\u9501\u6267\u884c\u201d\u7684\u5e38\u89c4\u601d\u8def&#xff0c;\u7cfb\u7edf\u5c06\u9762\u4e34\u4e24\u4e2a\u6bc1\u706d\u6027\u7684\u95ee\u9898&#xff1a;<\/p>\n<p>1. \u9501\u9738\u5360\u65f6\u95f4\u8fc7\u957f&#xff0c;\u4e25\u91cd\u963b\u585e\u4e1a\u52a1\u7ebf\u7a0b&#xff08;\u6027\u80fd\u6740\u624b&#xff09;<\/p>\n<p>\u5982\u679c\u5728\u52a0\u9501\u671f\u95f4\u53bb\u904d\u5386\u6267\u884c\u6240\u6709\u4efb\u52a1&#xff0c;\u90a3\u4e48\u9501\u88ab\u6301\u6709\u7684\u65f6\u95f4&#xff0c;\u5c31\u7b49\u4e8e\u6240\u6709\u4efb\u52a1\u5b9e\u9645\u6267\u884c\u65f6\u95f4\u4e4b\u548c&#xff08;\u65f6\u95f4\u590d\u6742\u5ea6\u662f $O(N)$&#xff09;\u3002\u5982\u679c\u67d0\u4e2a\u4efb\u52a1\u6d89\u53ca\u5230\u590d\u6742\u7684\u7b97\u6cd5\u903b\u8f91\u6216\u8017\u65f6\u8ba1\u7b97&#xff0c;\u8fd9\u628a\u9501\u5c31\u4f1a\u88ab\u957f\u65f6\u95f4\u9738\u5360\u3002<\/p>\n<p>\u5728\u8fd9\u6bb5\u6f2b\u957f\u7684\u65f6\u95f4\u91cc&#xff0c;\u5916\u90e8\u7684\u4e1a\u52a1\u7ebf\u7a0b\u6c60\u5982\u679c\u60f3\u5f80\u961f\u5217\u91cc\u538b\u5165\u65b0\u4efb\u52a1&#xff0c;\u5c31\u5168\u90fd\u4f1a\u88ab\u5361\u6b7b&#xff08;\u963b\u585e\u5728\u8bf7\u6c42\u83b7\u53d6\u9501\u7684\u90a3\u4e00\u884c\u4ee3\u7801\u4e0a&#xff09;\u3002\u8fd9\u5b8c\u5168\u8fdd\u80cc\u4e86\u9ad8\u5e76\u53d1\u67b6\u6784\u4e2d\u201c\u591a\u7ebf\u7a0b\u5f02\u6b65\u5206\u644a\u201d\u7684\u521d\u8877&#xff0c;\u786c\u751f\u751f\u628a\u591a\u7ebf\u7a0b\u9000\u5316\u6210\u4e86\u4e32\u884c\u6392\u961f\u3002<\/p>\n<p>2. \u81f4\u547d\u7684\u81ea\u6b7b\u9501\u98ce\u9669 (Deadlock)<\/p>\n<p>\u5047\u8bbe\u4efb\u52a1\u961f\u5217\u4e2d\u6709\u4e00\u4e2a\u4efb\u52a1 Task_1\u3002\u800c Task_1 \u7684\u4ee3\u7801\u903b\u8f91\u5185\u90e8&#xff0c;\u78b0\u5de7\u53c8\u89e6\u53d1\u4e86\u5411\u540c\u4e00\u4e2a\u4efb\u52a1\u961f\u5217\u538b\u5165\u65b0\u4efb\u52a1 Task_2 \u7684\u64cd\u4f5c\u3002<\/p>\n<p>\u5982\u679c\u6211\u4eec\u5728\u6267\u884c Task_1 \u7684\u65f6\u5019\u6b63\u6b7b\u6b7b\u6525\u7740\u8fd9\u628a\u9501&#xff0c;\u6b64\u65f6 Task_1 \u53c8\u53bb\u8bf7\u6c42\u540c\u4e00\u628a\u9501\u6765\u538b\u5165\u65b0\u4efb\u52a1&#xff0c;\u5c31\u4f1a\u5f53\u573a\u89e6\u53d1\u6b7b\u9501&#xff0c;\u6574\u4e2a EventLoop \u7ebf\u7a0b\u5c06\u6c38\u4e45\u762b\u75ea\u3002<\/p>\n<h3>9. \u7ec8\u6781\u8bef\u533a&#xff1a;\u5916\u90e8\u7ebf\u7a0b\u5e72\u6d3b&#xff0c;\u96be\u9053\u4e0d\u662f\u56e0\u4e3a\u521a\u6536\u5230\u7f51\u7edc\u8bf7\u6c42\u5417&#xff1f;\u4e3a\u4ec0\u4e48\u8fd8\u8981 eventfd \u5524\u9192&#xff1f;<\/h3>\n<p>\u5f88\u591a\u5f00\u53d1\u8005\u5728\u63a8\u6f14 Reactor \u67b6\u6784\u65f6&#xff0c;\u4f1a\u4ea7\u751f\u4e00\u4e2a\u975e\u5e38\u5408\u4e4e\u903b\u8f91\u7684\u7591\u95ee&#xff1a; \u201c\u65e2\u7136\u5916\u90e8\u4e1a\u52a1\u7ebf\u7a0b\u6b63\u5728\u5904\u7406\u4efb\u52a1&#xff0c;\u90a3\u8bf4\u660e\u521a\u521a\u80af\u5b9a\u6709\u5ba2\u6237\u7aef\u53d1\u6765\u4e86\u7f51\u7edc\u8bf7\u6c42\u5440&#xff01;\u65e2\u7136\u6709\u7f51\u7edc\u8bf7\u6c42&#xff0c;epoll_wait \u4e0d\u5c31\u5df2\u7ecf\u81ea\u52a8\u89e3\u9664\u963b\u585e\u4e86\u5417&#xff1f;\u4ee3\u7801\u81ea\u7136\u4f1a\u8d70\u5230\u7b2c 3 \u6b65\u53bb\u6267\u884c\u4efb\u52a1\u961f\u5217&#xff0c;\u54ea\u91cc\u8fd8\u9700\u8981 eventfd \u591a\u6b64\u4e00\u4e3e\u53bb\u5524\u9192&#xff1f;\u201d<\/p>\n<p>\u4ea7\u751f\u8fd9\u4e2a\u7591\u95ee\u7684\u6838\u5fc3\u539f\u56e0&#xff0c;\u662f\u5ffd\u7565\u4e86\u9ad8\u5e76\u53d1\u67b6\u6784\u4e2d\u6700\u6838\u5fc3\u7684\u4e24\u4e2a\u5b57&#xff1a;\u5f02\u6b65\u3002<\/p>\n<p>EventLoop \u7ebf\u7a0b\u628a\u6570\u636e\u4ea4\u7ed9\u4e1a\u52a1\u7ebf\u7a0b\u540e&#xff0c;\u7edd\u5bf9\u4e0d\u4f1a\u5728\u539f\u5730\u50bb\u7b49\u4e1a\u52a1\u7ebf\u7a0b\u7b97\u5b8c\u7ed3\u679c&#xff0c;\u800c\u662f\u7acb\u523b\u8f6c\u5934\u53bb\u7761\u4e0b\u4e00\u89c9\u4e86&#xff01;<\/p>\n<p>\u6211\u4eec\u6765\u770b\u770b\u771f\u5b9e\u7684\u65f6\u95f4\u8f74&#xff08;Timeline&#xff09;&#xff0c;\u4f60\u5c31\u5f7b\u5e95\u660e\u767d\u4e86&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u3010T1 \u65f6\u523b\u3011&#xff1a;\u5ba2\u6237\u7aef\u53d1\u6765\u8bf7\u6c42&#xff08;\u6bd4\u5982\u67e5\u8be2\u6570\u636e\u5e93&#xff09;\u3002epoll_wait \u786e\u5b9e\u81ea\u52a8\u89e3\u9664\u963b\u585e\u4e86\u3002<\/p>\n<\/li>\n<li>\n<p>\u3010T2 \u65f6\u523b\u3011&#xff1a;EventLoop \u7ebf\u7a0b&#xff08;\u7ebf\u7a0bA&#xff09;\u628a\u6570\u636e\u8bfb\u51fa\u6765&#xff0c;\u987a\u624b\u6254\u7ed9\u5916\u90e8\u4e1a\u52a1\u7ebf\u7a0b\u6c60&#xff08;\u7ebf\u7a0bB&#xff09;&#xff0c;\u8bf4&#xff1a;\u201c\u4f60\u53bb\u67e5\u6570\u636e\u5e93\u5427&#xff0c;\u67e5\u5b8c\u4e86\u8bb0\u5f97\u53d1\u7ed9\u5ba2\u6237\u7aef\u3002\u201d<\/p>\n<\/li>\n<li>\n<p>\u3010T3 \u65f6\u523b (\u5173\u952e\u8f6c\u6298\u70b9)\u3011&#xff1a;\u628a\u6d3b\u6254\u7ed9\u7ebf\u7a0bB\u540e&#xff0c;\u7ebf\u7a0bA\u7684\u8fd9\u4e00\u6b21 while \u5faa\u73af\u5c31\u7ed3\u675f\u4e86\u3002\u56e0\u4e3a\u6b64\u65f6\u4efb\u52a1\u961f\u5217\u91cc\u8fd8\u6ca1\u4e1c\u897f&#xff08;\u7ebf\u7a0bB\u8fd8\u5728\u82e6\u54c8\u54c8\u5730\u67e5\u6570\u636e\u5e93\u5462&#xff09;&#xff0c;\u7ebf\u7a0bA \u7acb\u523b\u8fdb\u5165\u4e86\u4e0b\u4e00\u6b21\u5faa\u73af&#xff0c;\u91cd\u65b0\u5361\u6b7b\u5728\u4e86 epoll_wait \u4e0a&#xff0c;\u5f00\u59cb\u95ed\u773c\u7761\u89c9\u3002<\/p>\n<\/li>\n<li>\n<p>\u3010T4 \u65f6\u523b\u3011&#xff1a;\u8fc7\u4e86\u6f2b\u957f\u7684 50 \u6beb\u79d2&#xff0c;\u5916\u90e8\u7ebf\u7a0bB \u7ec8\u4e8e\u628a\u6570\u636e\u5e93\u67e5\u5b8c\u4e86&#xff0c;\u751f\u6210\u4e86\u53d1\u9001\u4efb\u52a1&#xff0c;\u538b\u5165\u4e86\u4efb\u52a1\u961f\u5217\u3002<\/p>\n<\/li>\n<li>\n<p>\u3010T5 \u65f6\u523b (\u6b7b\u5c40)\u3011&#xff1a;\u6b64\u65f6&#xff0c;\u5982\u679c\u6ca1\u6709\u5176\u4ed6\u65b0\u5ba2\u6237\u7aef\u53d1\u6765\u7f51\u7edc\u8bf7\u6c42&#xff0c;\u7ebf\u7a0bA \u4f9d\u7136\u5728 epoll_wait \u91cc\u7761\u5927\u89c9\u3002\u5b83\u6839\u672c\u4e0d\u77e5\u9053\u6b64\u65f6\u4efb\u52a1\u961f\u5217\u91cc\u5df2\u7ecf\u6709\u7ebf\u7a0bB\u521a\u653e\u8fdb\u53bb\u7684\u4efb\u52a1\u4e86\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u7834\u5c40\u7684\u5173\u952e&#xff1a; \u5728 T4 \u65f6\u523b&#xff0c;\u7ebf\u7a0bB \u5f80\u961f\u5217\u538b\u5165\u4efb\u52a1\u540e&#xff0c;\u5fc5\u987b\u5229\u7528 eventfd \u8e39\u7ebf\u7a0bA\u4e00\u811a&#xff08;\u5524\u9192&#xff09;\u3002 \u7ebf\u7a0bA \u88ab\u8e39\u9192\u540e&#xff0c;\u53d1\u73b0\u4e0d\u662f\u7f51\u7edc\u8bf7\u6c42&#xff0c;\u800c\u662f\u95e8\u94c3\u54cd\u4e86&#xff0c;\u8fd9\u624d\u53bb\u638f\u4efb\u52a1\u961f\u5217&#xff0c;\u628a\u521a\u624d\u67e5\u6570\u636e\u5e93\u7684\u7ed3\u679c\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\u3002<\/p>\n<h3 style=\"background-color:transparent\">11. \u7ec8\u6781\u6027\u80fd\u4f18\u5316&#xff1a;\u57fa\u4e8e\u7ebf\u7a0b ID \u7684\u201c\u5c31\u5730\u6267\u884c\u201d\u7b56\u7565<\/h3>\n<p>\u5728\u5f15\u5165\u4e86\u4efb\u52a1\u961f\u5217\u548c eventfd \u5524\u9192\u673a\u5236\u540e&#xff0c;\u591a\u7ebf\u7a0b\u64cd\u4f5c\u8fde\u63a5\u7684\u5b89\u5168\u6027\u5f97\u5230\u4e86\u7edd\u5bf9\u4fdd\u969c\u3002\u4f46\u968f\u4e4b\u800c\u6765\u7684\u662f\u4e00\u4e2a\u65b0\u7684\u6027\u80fd\u8003\u91cf&#xff1a;\u5982\u679c\u53d1\u8d77\u64cd\u4f5c\u7684\u672c\u6765\u5c31\u662f EventLoop \u7ebf\u7a0b\u81ea\u5df1&#xff0c;\u8fd8\u9700\u8981\u8d70\u4e00\u904d\u201c\u52a0\u9501 -&gt; \u5165\u961f -&gt; \u5524\u9192\u201d\u7684\u7e41\u7410\u6d41\u7a0b\u5417&#xff1f;<\/p>\n<p>\u7b54\u6848\u662f\u5b8c\u5168\u4e0d\u9700\u8981\u3002\u4e3a\u4e86\u8ffd\u6c42\u6781\u81f4\u7684\u6027\u80fd&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5728 EventLoop \u4e2d\u5f15\u5165\u7ebf\u7a0b\u8eab\u4efd\u6821\u9a8c\u673a\u5236&#xff0c;\u5b9e\u73b0\u667a\u80fd\u7684\u4efb\u52a1\u8c03\u5ea6\u3002<\/p>\n<h4>\u6838\u5fc3\u8bbe\u8ba1\u903b\u8f91&#xff1a;\u540c\u7ebf\u7a0b\u76f4\u63a5\u5e72&#xff0c;\u8de8\u7ebf\u7a0b\u6392\u961f\u5e72<\/h4>\n<p>\u5728 EventLoop \u6a21\u5757\u521d\u59cb\u5316\u65f6&#xff0c;\u4fdd\u5b58\u4e0b\u5f53\u524d\u7ed1\u5b9a\u8be5\u6a21\u5757\u7684 \u7ebf\u7a0b ID (Thread ID)\u3002<\/p>\n<p>\u5f53\u4efb\u4f55\u4ee3\u7801\u8bd5\u56fe\u5bf9\u8fde\u63a5\u8fdb\u884c\u64cd\u4f5c&#xff08;\u5982\u53d1\u9001\u6570\u636e send&#xff09;\u65f6&#xff0c;\u7cfb\u7edf\u4f1a\u5148\u83b7\u53d6\u5f53\u524d\u64cd\u4f5c\u8005\u7684\u7ebf\u7a0b ID&#xff0c;\u5e76\u4e0e EventLoop \u4fdd\u5b58\u7684 ID \u8fdb\u884c\u6bd4\u5bf9&#xff1a;<\/p>\n<li>\n<p>\u8eab\u4efd\u5339\u914d&#xff08;\u64cd\u4f5c\u5728\u672c\u7ebf\u7a0b\u5185\u53d1\u8d77&#xff09;<\/p>\n<p>\u5982\u679c\u5224\u65ad\u7ed3\u679c\u4e3a\u4e00\u81f4&#xff0c;\u8bf4\u660e\u5f53\u524d\u5c31\u662f EventLoop \u7ebf\u7a0b\u81ea\u5df1\u5728\u505a\u4e8b\u3002\u6b64\u65f6\u64cd\u4f5c\u662f\u7edd\u5bf9\u7ebf\u7a0b\u5b89\u5168\u7684&#xff0c;\u4e0d\u9700\u8981\u538b\u5165\u4efb\u52a1\u6c60&#xff0c;\u76f4\u63a5\u201c\u5c31\u5730\u6267\u884c\u201d\u5bf9\u5e94\u7684\u4e1a\u52a1\u4ee3\u7801\u3002<\/p>\n<p>(\u5e38\u89c1\u573a\u666f&#xff1a;EventLoop \u76d1\u542c\u5230\u8bfb\u4e8b\u4ef6&#xff0c;\u5728\u8bfb\u56de\u8c03\u51fd\u6570\u4e2d\u89e3\u6790\u5b8c\u534f\u8bae\u540e&#xff0c;\u7acb\u523b\u987a\u624b\u56de\u590d\u4e00\u4e2a ACK \u786e\u8ba4\u5305\u3002)<\/p>\n<\/li>\n<li>\n<p>\u8eab\u4efd\u4e0d\u5339\u914d&#xff08;\u64cd\u4f5c\u5728\u5916\u90e8\u7ebf\u7a0b\u53d1\u8d77&#xff09;<\/p>\n<p>\u5982\u679c\u5224\u65ad\u7ed3\u679c\u4e0d\u4e00\u81f4&#xff0c;\u8bf4\u660e\u662f\u5916\u90e8\u7684\u4e1a\u52a1\u7ebf\u7a0b\u6c60&#xff08;\u6216\u5b9a\u65f6\u5668\u7ebf\u7a0b&#xff09;\u5728\u5c1d\u8bd5\u64cd\u4f5c\u8fde\u63a5&#xff0c;\u5b58\u5728\u5e76\u53d1\u51b2\u7a81\u98ce\u9669\u3002\u6b64\u65f6\u624d\u5fc5\u987b\u5c06\u64cd\u4f5c\u5c01\u88c5\u6210\u4efb\u52a1\u538b\u5165\u4efb\u52a1\u961f\u5217&#xff0c;\u7b49\u5f85 EventLoop \u5904\u7406\u5b8c I\/O \u4e8b\u4ef6\u540e\u518d\u96c6\u4e2d\u6267\u884c\u3002<\/p>\n<\/li>\n<h4>\u673a\u5236\u4f18\u52bf\u5bf9\u6bd4<\/h4>\n<p>\u901a\u8fc7\u8fd9\u79cd\u667a\u80fd\u5206\u6d41&#xff0c;\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u4efb\u52a1\u7684\u6765\u6e90&#xff0c;\u5339\u914d\u6700\u9ad8\u6548\u7684\u5904\u7406\u8def\u5f84&#xff1a;<\/p>\n<table>\n<tr>\n<td>\u64cd\u4f5c\u53d1\u8d77\u65b9<\/td>\n<td>\u6821\u9a8c\u7ed3\u679c<\/td>\n<td>\u6267\u884c\u8def\u5f84<\/td>\n<td>\u6838\u5fc3\u6536\u76ca<\/td>\n<\/tr>\n<tbody>\n<tr>\n<td>\u5f53\u524d EventLoop \u672c\u7ebf\u7a0b<\/td>\n<td>\u7ebf\u7a0b ID \u4e00\u81f4<\/td>\n<td>\u76f4\u63a5\u6267\u884c (\u666e\u901a\u51fd\u6570\u8c03\u7528)<\/td>\n<td>\u6027\u80fd\u62c9\u6ee1\u3002\u5f7b\u5e95\u7701\u53bb\u4e86\u4efb\u52a1\u5c01\u88c5\u3001\u4e92\u65a5\u9501\u7ade\u4e89\u3001\u5165\u961f\/\u51fa\u961f\u4ee5\u53ca eventfd 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