{"id":123038,"date":"2026-11-06T08:18:59","date_gmt":"2026-11-06T00:18:59","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/123038.html"},"modified":"2026-11-06T08:18:59","modified_gmt":"2026-11-06T00:18:59","slug":"%e3%80%90linux-%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b%e3%80%91reactor-%e5%8f%8d%e5%ba%94%e5%a0%86%e6%a8%a1%e5%bc%8f%ef%bc%88%e4%b8%8a%ef%bc%89%ef%bc%9a%e6%8a%8a-epoll-%e5%86%99%e6%88%90%e7%9c%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/123038.html","title":{"rendered":"\u3010Linux \u7f51\u7edc\u7f16\u7a0b\u3011Reactor \u53cd\u5e94\u5806\u6a21\u5f0f\uff08\u4e0a\uff09\uff1a\u628a epoll \u5199\u6210\u771f\u6b63\u7684\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668"},"content":{"rendered":"

\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/
\n #content_views .toc,
\n \/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/
\n #content_views.markdown_views > p:empty:has(+ .toc),
\n #content_views.markdown_views > .toc + p:empty,
\n \/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/
\n #content_views.htmledit_views #main-toc,
\n #content_views.htmledit_views #hr-toc,
\n #content_views.htmledit_views p[id*=\\”-toc\\”] {
\n display: none !important;
\n }
\n \/* \u76ee\u5f55\u53bb\u6389\u540e\uff0c\u7d27\u8ddf\u7684\u9996\u4e2a\u6807\u9898\u4e0d\u518d\u591a\u51fa\u4e00\u5757\u4e0a\u8fb9\u8ddd *\/
\n #content_views.markdown_views > .toc + h1,
\n #content_views.markdown_views > .toc + h2,
\n #content_views.markdown_views > .toc + h3,
\n #content_views.markdown_views > .toc + h4,
\n #content_views.markdown_views > .toc + p:empty + h1,
\n #content_views.markdown_views > .toc + p:empty + h2,
\n #content_views.markdown_views > .toc + p:empty + h3,
\n #content_views.markdown_views > .toc + p:empty + h4 {
\n margin-top: 0 !important;
\n }<\/p>\n

🔥 \u661f\u5149\u7f16\u8bd1\u8005<\/b><\/font> \u00b7 \u4e2a\u4eba\u4e3b\u9875<\/p>\n

📚 \u5b66\u4e60\u4e13\u680f：<\/b><\/font> \u300aC\/C++ \u6210\u957f\u7b14\u8bb0\u300b<\/font> \u00b7 \u300aLinux \u5b9e\u8df5\u624b\u518c\u300b<\/font> \u00b7 \u300a\u6570\u636e\u7ed3\u6784\u4e0e\u7b97\u6cd5\u300b<\/font><\/p>\n

🌄 \u5411\u4e91\u7aef\u98de\u626c，\u7f16\u8bd1\u5c5e\u4e8e\u81ea\u5df1\u7684\u4ee3\u7801\u661f\u6cb3\u3002<\/b><\/font><\/p>\n

\n

\u2615 \u5199\u5728\u5f00\u7bc7<\/font><\/h4>\n

\u2003\u2003\u4f60\u597d，\u8fd9\u91cc\u662f \u661f\u5149\u7f16\u8bd1\u8005<\/b><\/font>\u3002<\/font><\/p>\n

\u2003\u2003\u8fd9\u91cc\u8bb0\u5f55\u6211\u5728 C\/C++\u3001Linux\u3001\u6570\u636e\u7ed3\u6784\u4e0e\u7b97\u6cd5<\/b><\/font> \u5b66\u4e60\u4e2d\u9047\u5230\u7684\u771f\u5b9e\u95ee\u9898\u3001\u4eb2\u624b\u9a8c\u8bc1\u8fc7\u7684\u4ee3\u7801，\u4ee5\u53ca\u90a3\u4e9b\u5bb9\u6613\u88ab\u5ffd\u7565\u7684\u5b9e\u73b0\u7ec6\u8282\u3002<\/font><\/p>\n

\u2003\u2003\u6bd4\u8d77\u7b80\u5355\u7f57\u5217\u7ed3\u8bba，\u6211\u66f4\u613f\u610f\u4ece\u95ee\u9898\u51fa\u53d1，\u628a\u4e00\u4e2a\u77e5\u8bc6\u70b9\u7684\u6765\u7531\u8bb2\u6e05\u695a，\u628a\u201c\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u6837<\/b><\/font>\u201d\u548c\u201c\u5e94\u8be5\u600e\u6837\u89e3\u51b3<\/b><\/font>\u201d\u8bf4\u660e\u767d，\u8ba9\u6bcf\u4e00\u6b21\u8e29\u5751\u90fd\u6c89\u6dc0\u6210\u53ef\u4ee5\u590d\u7528\u7684\u7ecf\u9a8c\u3002<\/font><\/p>\n

\u2003\u2003\u5982\u679c\u8fd9\u7bc7\u8bb0\u5f55\u80fd\u5e2e\u4f60\u5c11\u7ed5\u4e00\u70b9\u8def<\/b><\/font>，\u6216\u8ba9\u67d0\u4e2a\u6a21\u7cca\u7684\u5730\u65b9\u5ffd\u7136\u53d8\u5f97\u6e05\u6670，\u90a3\u4e48\u8fd9\u6b21\u5206\u4eab\u4fbf\u6709\u4e86\u610f\u4e49\u3002\u613f\u6211\u4eec\u5728\u4e00\u6b21\u6b21\u9605\u8bfb\u3001\u7f16\u8bd1\u4e0e\u8c03\u8bd5\u4e2d\u7a33\u6b65\u5411\u524d，\u6162\u6162\u642d\u8d77\u5c5e\u4e8e\u81ea\u5df1\u7684\u6280\u672f\u4e16\u754c\u3002<\/font><\/p>\n

\n

<\/h2>\n

🔥 \u672c\u6587\u5b9a\u4f4d：\u4ece\u201c\u4f1a\u7528 epoll\u201d\u8d70\u5411\u201c\u4f1a\u7ec4\u7ec7\u7f51\u7edc\u670d\u52a1\u5668\u201d，\u7528\u4e00\u4e2a TCP \u8ba1\u7b97\u5668\u4e32\u8d77\u8fde\u63a5\u63a5\u5165\u3001\u975e\u963b\u585e\u8bfb\u5199\u3001\u534f\u8bae\u89e3\u6790\u548c\u8fde\u63a5\u56de\u6536\u3002<\/p>\n

💡 \u5b66\u4e60\u76ee\u6807：\u770b\u61c2 Reactor \u7684\u804c\u8d23\u5212\u5206，\u638c\u63e1 Connection\u3001\u56de\u8c03\u5206\u6d3e\u3001ET \u8bfb\u5199\u5faa\u73af\u3001\u6309\u9700\u8ba2\u9605 EPOLLOUT，\u4ee5\u53ca\u5b89\u5168\u5173\u95ed\u8fde\u63a5\u7684\u987a\u5e8f\u3002<\/p>\n

📌 \u5b9e\u9a8c\u73af\u5883：Linux\u3001C++17\u3001IPv4 TCP；\u670d\u52a1\u53ea\u7ed1\u5b9a 127.0.0.1:9090\u3002\u793a\u4f8b\u91c7\u7528\u5355\u7ebf\u7a0b Reactor，\u9002\u5408\u89c2\u5bdf\u6267\u884c\u987a\u5e8f；\u4e0d\u5305\u542b\u5b8c\u6574\u7684\u8d85\u65f6\u3001\u8ba4\u8bc1\u548c\u751f\u4ea7\u7ea7\u8fc7\u8f7d\u6cbb\u7406\u3002<\/p>\n

\u7b2c\u4e00\u6b21\u5199 epoll \u670d\u52a1\u5668\u65f6，\u4ee3\u7801\u5f80\u5f80\u5f88\u76f4\u767d：epoll_wait() \u8fd4\u56de，\u68c0\u67e5\u4e8b\u4ef6\u7c7b\u578b，\u8c03\u7528 accept() \u6216 recv()，\u518d\u628a\u7ed3\u679c\u53d1\u56de\u53bb\u3002<\/p>\n

\u95ee\u9898\u4f1a\u5728\u529f\u80fd\u589e\u52a0\u540e\u51fa\u73b0：\u76d1\u542c\u8fde\u63a5\u548c\u666e\u901a\u8fde\u63a5\u6df7\u5728\u540c\u4e00\u4e2a\u5927\u5faa\u73af\u91cc；\u534a\u6761\u8bf7\u6c42\u4e0d\u77e5\u9053\u653e\u5728\u54ea\u91cc；\u4e00\u6b21\u6ca1\u53d1\u5b8c\u7684\u5e94\u7b54\u4e22\u4e86；\u8bfb\u56de\u8c03\u5173\u95ed\u8fde\u63a5\u540e，\u5199\u56de\u8c03\u8fd8\u62ff\u7740\u65e7\u6307\u9488\u7ee7\u7eed\u6267\u884c\u3002<\/p>\n

\u8fd9\u4e9b\u95ee\u9898\u5e76\u4e0d\u662f\u518d\u80cc\u4e00\u4e2a epoll \u53c2\u6570\u5c31\u80fd\u89e3\u51b3\u7684\u3002\u6211\u4eec\u9700\u8981\u7ed9\u4e8b\u4ef6\u3001\u8fde\u63a5\u72b6\u6001\u548c\u5904\u7406\u903b\u8f91\u5b89\u6392\u7a33\u5b9a\u7684\u4f4d\u7f6e\u3002Reactor \u7684\u4ef7\u503c，\u5728\u4e8e\u628a\u201c\u4ec0\u4e48\u65f6\u5019\u53ef\u4ee5\u5904\u7406\u201d\u548c\u201c\u5177\u4f53\u600e\u6837\u5904\u7406\u201d\u7ec4\u7ec7\u6210\u4e00\u5957\u53ef\u6301\u7eed\u8fd0\u8f6c\u7684\u7ed3\u6784\u3002<\/p>\n

\u672c\u6587\u5148\u5b8c\u6210\u5355 Reactor\u3002\u4e0b\u4e00\u7bc7\u518d\u628a\u5b83\u6269\u5c55\u5230 One Thread One Loop，\u5e76\u89e3\u91ca\u4efb\u52a1\u961f\u5217\u600e\u6837\u501f\u52a9 eventfd \u53eb\u9192\u76ee\u6807\u7ebf\u7a0b\u3002<\/p>\n

\u6587\u7ae0\u76ee\u5f55<\/h3>\n
  • Reactor \u5230\u5e95\u6bd4 epoll \u591a\u4e86\u4ec0\u4e48<\/li>\n
  • Connection：\u628a\u8fde\u63a5\u7684\u4e0a\u4e0b\u6587\u6536\u62e2\u8d77\u6765<\/li>\n
  • \u4e8b\u4ef6\u5faa\u73af\u5982\u4f55\u627e\u5230\u6b63\u786e\u7684\u56de\u8c03<\/li>\n
  • Acceptor：\u65b0\u8fde\u63a5\u4e5f\u8d70\u4e8b\u4ef6\u9a71\u52a8<\/li>\n
  • \u8bfb\u5230 EAGAIN，\u4e0e\u8bfb\u5230\u4e00\u4e2a\u5b8c\u6574\u8bf7\u6c42<\/li>\n
  • \u534f\u8bae\u89e3\u6790\u4e0e\u4e1a\u52a1\u5904\u7406\u600e\u6837\u5206\u5c42<\/li>\n
  • \u53d1\u9001\u7f13\u51b2\u4e0e EPOLLOUT \u7684\u5f00\u5173<\/li>\n
  • \u5173\u95ed\u8fde\u63a5：\u6bd4\u8c03\u7528 close \u591a\u505a\u51e0\u6b65<\/li>\n
  • \u5b8c\u6574 C++17 \u8ba1\u7b97\u5668\u670d\u52a1\u5668<\/li>\n
  • \u7f16\u8bd1\u8fd0\u884c\u4e0e\u8fb9\u754c\u5b9e\u9a8c<\/li>\n
  • \u8d44\u6e90\u3001\u516c\u5e73\u6027\u4e0e\u5355 Reactor \u7684\u8fb9\u754c<\/li>\n
  • \u5e38\u89c1\u95ee\u9898\u4e0e\u81ea\u6d4b<\/li>\n

    \u4e00\u3001Reactor \u5230\u5e95\u6bd4 epoll \u591a\u4e86\u4ec0\u4e48<\/h3>\n

    1.1 \u5148\u4ece\u4e00\u4e2a\u63a5\u5f85\u53f0\u7406\u89e3\u5206\u5de5<\/h4>\n

    \u60f3\u8c61\u4e00\u4e2a\u670d\u52a1\u5927\u5385：\u6709\u4eba\u521a\u8fdb\u95e8，\u6709\u4eba\u7684\u6750\u6599\u5df2\u5907\u9f50，\u6709\u4eba\u7684\u7ed3\u679c\u5df2\u7ecf\u53ef\u4ee5\u9886\u53d6\u3002\u63a5\u5f85\u53f0\u4e0d\u4f1a\u4e00\u76f4\u76ef\u7740\u4e00\u4e2a\u8fd8\u6ca1\u51c6\u5907\u597d\u7684\u4eba，\u800c\u662f\u5728\u6761\u4ef6\u6ee1\u8db3\u65f6，\u628a\u4e8b\u60c5\u4ea4\u7ed9\u5bf9\u5e94\u7684\u5904\u7406\u4eba\u5458\u3002<\/p>\n

    \u653e\u5230\u7a0b\u5e8f\u91cc，socket \u662f\u88ab\u89c2\u5bdf\u7684\u5bf9\u8c61，\u53ef\u8bfb\u3001\u53ef\u5199\u662f\u5c31\u7eea\u6761\u4ef6，epoll \u8d1f\u8d23\u7b49\u5f85\u8fd9\u4e9b\u6761\u4ef6，\u4e8b\u4ef6\u5faa\u73af\u8d1f\u8d23\u5206\u6d3e，\u56de\u8c03\u6267\u884c\u5b9e\u9645\u5de5\u4f5c\u3002\u63a5\u5f85\u53f0\u7684\u7c7b\u6bd4\u53ea\u89e3\u91ca\u8c03\u5ea6\u5173\u7cfb：\u5728\u672c\u6587\u7684\u5355\u7ebf\u7a0b\u5b9e\u73b0\u91cc，\u56de\u8c03\u4ecd\u7136\u4f9d\u6b21\u6267\u884c，\u4e0d\u4f1a\u51ed\u7a7a\u4ea7\u751f\u5e76\u884c\u7684\u5de5\u4f5c\u4eba\u5458\u3002<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n\n\u89d2\u8272\u5728\u670d\u52a1\u5668\u4e2d\u7684\u5bf9\u5e94\u7269\u4e3b\u8981\u804c\u8d23<\/tr>\n\n\n\n\n\n\n
    Handle<\/td>\n\u76d1\u542c fd\u3001\u8fde\u63a5 fd<\/td>\n\u6807\u8bc6\u88ab\u89c2\u5bdf\u7684 I\/O \u5bf9\u8c61<\/td>\n<\/tr>\n
    Demultiplexer<\/td>\nepoll<\/td>\n\u7b49\u5f85\u5e76\u8fd4\u56de\u5c31\u7eea\u4e8b\u4ef6<\/td>\n<\/tr>\n
    Reactor \/ Dispatcher<\/td>\n\u4e8b\u4ef6\u5faa\u73af\u3001\u8fde\u63a5\u8868<\/td>\n\u6839\u636e\u4e8b\u4ef6\u627e\u5230\u5904\u7406\u5668<\/td>\n<\/tr>\n
    Event Handler<\/td>\n\u63a5\u5165\u3001\u8bfb\u53d6\u3001\u53d1\u9001\u56de\u8c03<\/td>\n\u63a8\u8fdb\u4e00\u6b21\u8fde\u63a5\u5904\u7406<\/td>\n<\/tr>\n
    Connection<\/td>\n\u7f13\u51b2\u533a\u3001\u72b6\u6001\u3001\u56de\u8c03\u96c6\u5408<\/td>\n\u4fdd\u7559\u8de8\u591a\u8f6e\u4e8b\u4ef6\u7684\u4e0a\u4e0b\u6587<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    epoll \u662f Linux \u4e0a\u5b9e\u73b0 Reactor \u7684\u4e00\u79cd\u5de5\u5177\u3002\u6362\u6210 poll\u3001select，\u7ec4\u7ec7\u65b9\u5f0f\u4ecd\u7136\u53ef\u4ee5\u662f Reactor；\u53ea\u8c03\u7528\u4e86 epoll，\u4e5f\u4e0d\u4ee3\u8868\u8fde\u63a5\u7ba1\u7406\u81ea\u7136\u5c31\u6709\u4e86\u826f\u597d\u7684\u7ed3\u6784\u3002<\/p>\n

    1.2 \u5c31\u7eea\u901a\u77e5\u4e0d\u662f\u5b8c\u6210\u901a\u77e5<\/h4>\n

    EPOLLIN \u5230\u6765\u540e，\u5e94\u7528\u4ecd\u7136\u8981\u8c03\u7528 recv()，\u518d\u89e3\u6790\u5b57\u8282\u3002EPOLLOUT \u5230\u6765\u540e，\u5e94\u7528\u4ecd\u7136\u8981\u8c03\u7528 send()，\u5e76\u5904\u7406\u90e8\u5206\u53d1\u9001\u3002\u5185\u6838\u6ca1\u6709\u66ff\u6211\u4eec\u5b8c\u6210\u4e1a\u52a1\u5c42\u8bfb\u53d6，\u4e5f\u4e0d\u4f1a\u81ea\u52a8\u6267\u884c\u56de\u8c03\u3002epoll \u624b\u518c<\/p>\n

    \u56e0\u6b64，Reactor \u901a\u5e38\u6309\u201c\u5c31\u7eea\u540e\u7531\u5e94\u7528\u6267\u884c I\/O\u201d\u6765\u7406\u89e3\u3002Proactor \u7684\u5178\u578b\u7ec4\u7ec7\u65b9\u5f0f\u5219\u56f4\u7ed5\u5df2\u63d0\u4ea4\u64cd\u4f5c\u7684\u5b8c\u6210\u901a\u77e5\u5c55\u5f00\u3002\u4e8c\u8005\u4e0d\u80fd\u4ec5\u7528\u201c\u6709\u6ca1\u6709\u7ebf\u7a0b\u6c60\u201d\u533a\u5206：\u7ebf\u7a0b\u6570\u4e0e I\/O \u901a\u77e5\u8bed\u4e49\u662f\u4e0d\u540c\u7684\u7ef4\u5ea6\u3002<\/p>\n

    1.3 \u7b49\u5f85\u53ef\u4ee5\u963b\u585e，\u8fde\u63a5\u64cd\u4f5c\u4f7f\u7528\u975e\u963b\u585e<\/h4>\n

    \u8fd9\u91cc\u7684\u201c\u975e\u963b\u585e\u670d\u52a1\u5668\u201d\u5e76\u4e0d\u662f\u8ba9 CPU \u4e00\u76f4\u8f6c\u3002\u6ca1\u6709\u4e8b\u4ef6\u65f6，\u7ebf\u7a0b\u53ef\u4ee5\u505c\u5728 epoll_wait(…, -1)；\u88ab\u5524\u9192\u540e，socket \u7684\u8bfb\u5199\u4e0d\u80fd\u56e0\u4e3a\u6682\u65f6\u7f3a\u5c11\u6570\u636e\u6216\u7a7a\u95f4\u800c\u957f\u65f6\u95f4\u6302\u4f4f\u6574\u4e2a\u5faa\u73af\u3002<\/p>\n

    \u8fd8\u8981\u68c0\u67e5\u56de\u8c03\u5185\u90e8\u7684\u4e1a\u52a1：\u540c\u6b65\u67e5\u8fdc\u7a0b\u6570\u636e\u5e93\u3001\u7b49\u5f85\u78c1\u76d8\u3001\u957f\u65f6\u95f4\u8ba1\u7b97，\u90fd\u53ef\u80fd\u62d6\u4f4f\u8fd9\u4e00\u6761\u7ebf\u7a0b\u3002Reactor \u89e3\u51b3\u7684\u662f\u8c03\u5ea6\u7ec4\u7ec7\u95ee\u9898，\u4e0d\u4f1a\u628a\u6240\u6709\u6162\u64cd\u4f5c\u81ea\u52a8\u53d8\u5feb\u3002<\/p>\n<\/p>\n

    \u4e8c\u3001Connection：\u628a\u8fde\u63a5\u7684\u4e0a\u4e0b\u6587\u6536\u62e2\u8d77\u6765<\/h3>\n

    2.1 fd \u53ea\u662f\u5165\u53e3，\u8fde\u63a5\u8fd8\u9700\u8981\u8bb0\u5fc6<\/h4>\n

    \u5ba2\u6237\u7aef\u7b2c\u4e00\u6b21\u9001\u6765 12 +，\u7b2c\u4e8c\u6b21\u624d\u9001\u6765 30\\\\n\u3002\u5982\u679c\u6211\u4eec\u53ea\u8bb0\u4f4f fd，\u7b2c\u4e00\u6b21\u7684\u5185\u5bb9\u5c31\u6ca1\u6709\u53ef\u9760\u7684\u5f52\u5c5e\u3002\u53d1\u9001\u4e5f\u7c7b\u4f3c：\u5e94\u7b54\u6709 100 \u5b57\u8282，\u672c\u8f6e\u53ea\u4ea4\u7ed9\u5185\u6838 40 \u5b57\u8282，\u4e0b\u8f6e\u5fc5\u987b\u63a5\u7740\u53d1\u9001\u5269\u4f59\u7684 60 \u5b57\u8282\u3002<\/p>\n

    Connection \u6b63\u662f\u4fdd\u5b58\u8fd9\u4e9b\u4fe1\u606f\u7684\u5730\u65b9\u3002\u5b83\u4e0d\u7b49\u4e8e\u5185\u6838\u4e2d\u7684 TCP \u8fde\u63a5，\u800c\u662f\u5e94\u7528\u5c42\u4e3a\u8fd9\u4e2a\u8fde\u63a5\u5efa\u7acb\u7684\u4e0a\u4e0b\u6587\u3002<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u672c\u6587\u7684\u5173\u952e\u5b57\u6bb5\u53ef\u4ee5\u8fd9\u6837\u9605\u8bfb：<\/p>\n

    int<\/span> fd;<\/span> \/\/ \u5f53\u524d\u6301\u6709\u7684\u63cf\u8ff0\u7b26<\/span>
    \nstd::<\/span>uint64_t<\/span> id;<\/span> \/\/ \u672c\u6b21\u8fde\u63a5\u7684\u72ec\u7acb\u8eab\u4efd<\/span>
    \nstd::<\/span>uint32_t<\/span> interests;<\/span> \/\/ \u5f53\u524d\u5411 epoll \u8ba2\u9605\u7684\u4e8b\u4ef6<\/span>
    \nstd::<\/span>string input,<\/span> output;<\/span> \/\/ \u5e94\u7528\u5c42\u8f93\u5165\u3001\u8f93\u51fa\u7f13\u51b2<\/span>
    \nstd::<\/span>size_t sent;<\/span> \/\/ output \u4e2d\u5df2\u7ecf\u53d1\u9001\u7684\u5b57\u8282\u6570<\/span>
    \nbool<\/span> eof,<\/span> closed;<\/span> \/\/ \u8bfb\u7aef\u7ed3\u675f\u4e0e\u6574\u4f53\u5173\u95ed\u5206\u5f00\u8bb0\u5f55<\/span>
    \nstd::<\/span>function<<\/span>void<\/span>(<\/span>Connection&<\/span>)<\/span>><\/span> readable,<\/span> writable;<\/span><\/p>\n

    input\u3001output \u90fd\u5728\u7528\u6237\u7a7a\u95f4\u3002\u5b83\u4eec\u4e0e socket \u7684\u5185\u6838\u63a5\u6536\u3001\u53d1\u9001\u7f13\u51b2\u533a\u4e0d\u662f\u540c\u4e00\u5757\u5185\u5b58\u3002\u5e94\u7528\u5c42\u7f13\u51b2\u7528\u4e8e\u534f\u8bae\u62fc\u63a5\u548c\u8de8\u4e8b\u4ef6\u4fdd\u5b58\u8fdb\u5ea6，\u4e0d\u80fd\u56e0\u4e3a\u201cTCP \u5df2\u7ecf\u6709\u7f13\u51b2\u201d\u5c31\u7701\u6389\u3002<\/p>\n

    2.2 \u56de\u8c03\u7edf\u4e00\u63a5\u53e3，\u884c\u4e3a\u6309\u5bf9\u8c61\u53d8\u5316<\/h4>\n

    \u76d1\u542c socket \u7684\u8bfb\u56de\u8c03\u8c03\u7528 accept4()；\u666e\u901a\u8fde\u63a5\u7684\u8bfb\u56de\u8c03\u8c03\u7528 recv()\u3002\u4e8b\u4ef6\u5faa\u73af\u53ea\u9700\u8981\u77e5\u9053\u201c\u8fd9\u4e2a\u5bf9\u8c61\u53ef\u8bfb\u65f6\u6267\u884c\u54ea\u4e2a\u51fd\u6570\u201d，\u4e0d\u5fc5\u5728\u5faa\u73af\u91cc\u5806\u6ee1\u4e0d\u540c\u4e1a\u52a1\u7684\u6761\u4ef6\u5206\u652f\u3002<\/p>\n

    listener-><\/span>readable =<\/span> [<\/span>this<\/span>]<\/span>(<\/span>Connection&<\/span> c)<\/span> {<\/span> accept_all<\/span>(<\/span>c)<\/span>;<\/span> }<\/span>;<\/span>
    \nclient-><\/span>readable =<\/span> [<\/span>this<\/span>]<\/span>(<\/span>Connection&<\/span> c)<\/span> {<\/span> receive<\/span>(<\/span>c)<\/span>;<\/span> }<\/span>;<\/span>
    \nclient-><\/span>writable =<\/span> [<\/span>this<\/span>]<\/span>(<\/span>Connection&<\/span> c)<\/span> {<\/span> flush<\/span>(<\/span>c)<\/span>;<\/span> }<\/span>;<\/span><\/p>\n

    \u8fd9\u91cc\u7528 lambda \u6355\u83b7 Reactor \u7684 this，\u8868\u8fbe\u201c\u56de\u8c03\u6240\u5c5e\u7684\u7ba1\u7406\u5668\u201d\u3002\u5b83\u6ca1\u6709\u5ef6\u957f Reactor \u7684\u751f\u547d\u5468\u671f，\u56e0\u6b64\u5bf9\u8c61\u9500\u6bc1\u987a\u5e8f\u5fc5\u987b\u4fdd\u8bc1\u6240\u6709\u8fde\u63a5\u548c\u56de\u8c03\u5148\u505c\u6b62\u4f7f\u7528\u7ba1\u7406\u5668\u3002\u672c\u6587\u5c06\u8fde\u63a5\u8868\u4f5c\u4e3a Reactor \u7684\u6210\u5458，\u7531\u540c\u4e00\u7ebf\u7a0b\u7ba1\u7406，\u6790\u6784\u65f6\u5148\u6e05\u7a7a\u8fde\u63a5\u8868\u3002<\/p>\n

    \u5982\u679c\u91c7\u7528\u9759\u6001\u5904\u7406\u51fd\u6570，\u4e5f\u53ef\u4ee5\u5728 Connection \u4e2d\u4fdd\u5b58\u6307\u5411 Reactor \u7684\u975e\u62e5\u6709\u6307\u9488\u3002\u4e24\u79cd\u5199\u6cd5\u90fd\u8981\u56de\u7b54\u540c\u4e00\u4e2a\u95ee\u9898：\u8c01\u521b\u5efa\u8fde\u63a5\u3001\u8c01\u9500\u6bc1\u8fde\u63a5，\u4ee5\u53ca\u56de\u8c03\u6267\u884c\u65f6\u7ba1\u7406\u5668\u662f\u5426\u4ecd\u7136\u5b58\u5728\u3002<\/p>\n

    2.3 interests \u4e0e returned events \u4e0d\u8981\u6df7\u7528<\/h4>\n

    interests \u8868\u793a\u201c\u6211\u60f3\u7b49\u54ea\u4e9b\u6761\u4ef6\u201d，epoll_wait() \u8fd4\u56de\u7684 events \u8868\u793a\u201c\u8fd9\u4e00\u6b21\u53d1\u751f\u4e86\u54ea\u4e9b\u6761\u4ef6\u201d\u3002\u4e8c\u8005\u7ecf\u5e38\u4f7f\u7528\u540c\u4e00\u7ec4\u4f4d\u5e38\u91cf，\u4f46\u4e0d\u80fd\u5f53\u4f5c\u540c\u4e00\u4e2a\u53d8\u91cf\u6765\u7ef4\u62a4\u3002<\/p>\n

    \u4fee\u6539\u8ba2\u9605\u65f6，\u5148\u8ba1\u7b97\u76ee\u6807\u63a9\u7801，\u518d\u8c03\u7528 EPOLL_CTL_MOD；\u6210\u529f\u540e\u624d\u66f4\u65b0 Connection \u4e2d\u7684\u8bb0\u5f55\u3002\u5426\u5219\u5185\u6838\u4ecd\u6309\u65e7\u63a9\u7801\u76d1\u63a7，\u7528\u6237\u7a7a\u95f4\u5374\u4ee5\u4e3a\u5df2\u7ecf\u5207\u6362\u6210\u529f，\u540e\u7eed\u6392\u67e5\u4f1a\u975e\u5e38\u56f0\u96be\u3002<\/p>\n<\/p>\n

    \u4e09\u3001\u4e8b\u4ef6\u5faa\u73af\u5982\u4f55\u627e\u5230\u6b63\u786e\u7684\u56de\u8c03<\/h3>\n

    3.1 \u4e00\u8f6e\u5faa\u73af\u53ea\u505a\u4e09\u4ef6\u4e8b<\/h4>\n

    \u7b2c\u4e00，\u7b49\u5f85\u5c31\u7eea\u4e8b\u4ef6；\u7b2c\u4e8c，\u7528\u4e8b\u4ef6\u643a\u5e26\u7684\u8eab\u4efd\u67e5\u627e\u8fde\u63a5；\u7b2c\u4e09，\u6267\u884c\u9002\u5408\u7684\u56de\u8c03\u3002\u8fd9\u4e00\u5c42\u4e0d\u5173\u5fc3\u8ba1\u7b97\u5668\u5982\u4f55\u52a0\u51cf\u4e58\u9664，\u4e5f\u4e0d\u9700\u8981\u8ba4\u8bc6\u6587\u672c\u534f\u8bae\u7684\u5206\u9694\u7b26\u3002<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    auto<\/span> found =<\/span> connections_.<\/span>find<\/span>(<\/span>ready[<\/span>i]<\/span>.<\/span>data.<\/span>u64)<\/span>;<\/span>
    \nif<\/span> (<\/span>found ==<\/span> connections_.<\/span>end<\/span>(<\/span>)<\/span>)<\/span> continue<\/span>;<\/span>
    \nauto<\/span> c =<\/span> found-><\/span>second;<\/span> \/\/ \u672c\u8f6e\u6682\u65f6\u6301\u6709\u5bf9\u8c61<\/span><\/p>\n

    if<\/span> (<\/span>(<\/span>events &<\/span> (<\/span>EPOLLIN |<\/span> EPOLLRDHUP |<\/span> EPOLLHUP)<\/span>)<\/span> &&<\/span> c-><\/span>readable)<\/span>
    \n c-><\/span>readable<\/span>(<\/span>*<\/span>c)<\/span>;<\/span>
    \nif<\/span> (<\/span>!<\/span>c-><\/span>closed &&<\/span> (<\/span>events &<\/span> EPOLLOUT)<\/span> &&<\/span> c-><\/span>writable)<\/span>
    \n c-><\/span>writable<\/span>(<\/span>*<\/span>c)<\/span>;<\/span><\/p>\n

    \u5b8c\u6574\u7a0b\u5e8f\u8fd8\u4f1a\u5148\u5904\u7406 EPOLLERR\u3002\u5b83\u5bf9\u666e\u901a\u8fde\u63a5\u91c7\u7528\u76f4\u63a5\u5173\u95ed\u7b56\u7565；\u9047\u5230\u76d1\u542c fd \u7684\u9519\u8bef\u5219\u660e\u786e\u7ec8\u6b62，\u8ba9\u6545\u969c\u53ef\u89c1\u3002\u9700\u8981\u66f4\u7ec6\u8bca\u65ad\u65f6，\u53ef\u4ee5\u8bfb\u53d6 SO_ERROR \u5e76\u8bb0\u5f55\u9519\u8bef\u539f\u56e0\u3002<\/p>\n

    3.2 \u4e3a\u4ec0\u4e48\u4e0d\u76f4\u63a5\u628a fd \u5f53\u6210\u6c38\u4e45\u8eab\u4efd<\/h4>\n

    fd \u6570\u5b57\u4f1a\u590d\u7528\u3002\u65e7\u8fde\u63a5\u5173\u95ed\u4e86 fd 7，\u65b0\u8fde\u63a5\u53ef\u80fd\u9a6c\u4e0a\u53c8\u5f97\u5230 fd 7\u3002\u5982\u679c\u4e00\u4e2a\u5ef6\u8fdf\u4efb\u52a1\u53ea\u643a\u5e26\u6570\u5b57 7，\u5b83\u65e0\u6cd5\u8bf4\u660e\u81ea\u5df1\u7a76\u7adf\u5c5e\u4e8e\u54ea\u4e00\u4ee3\u8fde\u63a5\u3002<\/p>\n

    \u672c\u6587\u7528\u5355\u8c03\u9012\u589e\u7684 uint64_t id \u6807\u8bc6\u8fde\u63a5，\u628a\u5b83\u5199\u8fdb epoll_event.data.u64，\u8fde\u63a5\u8868\u4e5f\u6309 id \u67e5\u627e\u3002\u65e7\u8eab\u4efd\u67e5\u4e0d\u5230\u5c31\u8df3\u8fc7；\u65b0\u8fde\u63a5\u5373\u4f7f\u590d\u7528\u4e86 fd，\u4e5f\u4e0d\u4f1a\u7ee7\u627f\u65e7\u8eab\u4efd\u3002\u8ba1\u6570\u6ea2\u51fa\u65f6\u7a0b\u5e8f\u62d2\u7edd\u7ee7\u7eed\u5206\u914d，\u800c\u4e0d\u662f\u56de\u7ed5\u540e\u91cd\u7528\u8eab\u4efd\u3002<\/p>\n

    \u8fd9\u662f\u4e00\u79cd\u660e\u786e\u7684\u8eab\u4efd\u7ba1\u7406\u65b9\u6848，\u4e0d\u662f\u58f0\u79f0 epoll \u6bcf\u6b21\u5173\u95ed\u540e\u90fd\u5fc5\u7136\u8fd4\u56de\u65e7\u4e8b\u4ef6\u3002\u5b83\u5c24\u5176\u9002\u5408\u4ee5\u540e\u6269\u5c55\u4efb\u52a1\u961f\u5217\u3001\u8d85\u65f6\u56de\u8c03\u548c\u5f02\u6b65\u4e1a\u52a1\u7ed3\u679c\u65f6\u4fdd\u6301\u4e00\u81f4\u7684\u6821\u9a8c\u65b9\u5f0f\u3002<\/p>\n

    3.3 shared_ptr \u4e0e closed \u5404\u89e3\u51b3\u4e00\u4e2a\u95ee\u9898<\/h4>\n

    \u672c\u8f6e\u6301\u6709 shared_ptr，\u662f\u4e3a\u4e86\u8ba9\u5bf9\u8c61\u5185\u5b58\u6d3b\u5230\u56de\u8c03\u7ed3\u675f\u3002\u8bfb\u56de\u8c03\u4ece\u8fde\u63a5\u8868\u79fb\u9664\u5bf9\u8c61\u540e，\u5c40\u90e8\u53d8\u91cf\u4ecd\u80fd\u4fdd\u8bc1\u5185\u5b58\u6709\u6548\u3002<\/p>\n

    closed \u5219\u8868\u793a\u8fde\u63a5\u5df2\u7ecf\u903b\u8f91\u5931\u6548\u3002\u5373\u4f7f\u5bf9\u8c61\u5185\u5b58\u8fd8\u5728，\u4e5f\u4e0d\u80fd\u7ee7\u7eed\u53d1\u9001\u3002\u5185\u5b58\u4ecd\u5b58\u5728，\u4e0d\u4ee3\u8868 fd \u4ecd\u53ef\u7528\u3002 \u56e0\u6b64\u8bfb\u56de\u8c03\u4e4b\u540e\u8fd8\u8981\u68c0\u67e5 closed，\u518d\u51b3\u5b9a\u662f\u5426\u6267\u884c\u5199\u56de\u8c03\u3002<\/p>\n

    \u8fd9\u4e5f\u4e0d\u610f\u5473\u7740 shared_ptr \u81ea\u52a8\u89e3\u51b3\u591a\u7ebf\u7a0b\u5e76\u53d1\u3002\u5b83\u4e0d\u4fdd\u62a4 input\u3001output \u7b49\u5b57\u6bb5；\u672c\u6587\u7684\u5b89\u5168\u524d\u63d0\u662f\u6240\u6709\u8fde\u63a5\u64cd\u4f5c\u5728\u540c\u4e00\u6761\u4e8b\u4ef6\u5faa\u73af\u7ebf\u7a0b\u4e2d\u6267\u884c\u3002<\/p>\n<\/p>\n

    \u56db\u3001Acceptor：\u65b0\u8fde\u63a5\u4e5f\u8d70\u4e8b\u4ef6\u9a71\u52a8<\/h3>\n

    4.1 \u76d1\u542c socket \u53ef\u8bfb\u65f6，\u8981\u5904\u7406\u7684\u662f\u8fde\u63a5\u961f\u5217<\/h4>\n

    \u76d1\u542c fd \u6ce8\u518c EPOLLIN | EPOLLET \u540e，\u8bfb\u5c31\u7eea\u8868\u793a\u53ef\u4ee5\u5c1d\u8bd5\u63a5\u53d7\u8fde\u63a5\u3002\u5b83\u4e0d\u5e94\u8be5\u8fdb\u5165\u666e\u901a\u8fde\u63a5\u7684\u534f\u8bae\u89e3\u6790\u6d41\u7a0b\u3002<\/p>\n

    ET \u6a21\u5f0f\u4e0b，\u4e00\u6b21\u901a\u77e5\u53ef\u80fd\u5bf9\u5e94\u591a\u6761\u5f85\u63a5\u53d7\u8fde\u63a5\u3002\u82e5\u53ea\u63a5\u53d7\u4e00\u6761\u5c31\u56de\u53bb\u7761\u7720，\u961f\u5217\u91cc\u5269\u4e0b\u7684\u5de5\u4f5c\u53ef\u80fd\u65e0\u6cd5\u53ca\u65f6\u5f97\u5230\u5904\u7406\u3002\u672c\u6587\u8fde\u7eed\u8c03\u7528 accept4()，\u76f4\u5230\u6682\u65f6\u6ca1\u6709\u8fde\u63a5\u53ef\u53d6\u3002<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    int<\/span> fd =<\/span> accept4<\/span>(<\/span>listener,<\/span> nullptr<\/span>,<\/span> nullptr<\/span>,<\/span>
    \n SOCK_NONBLOCK |<\/span> SOCK_CLOEXEC)<\/span>;<\/span>
    \nif<\/span> (<\/span>fd >=<\/span> 0<\/span>)<\/span> {<\/span>
    \n \/\/ \u521b\u5efa Connection，\u5b89\u88c5\u56de\u8c03，\u52a0\u5165 epoll \u4e0e\u8fde\u63a5\u8868\u3002<\/span>
    \n}<\/span> else<\/span> if<\/span> (<\/span>errno ==<\/span> EINTR)<\/span> {<\/span>
    \n \/\/ \u7ee7\u7eed\u5c1d\u8bd5\u3002<\/span>
    \n}<\/span> else<\/span> if<\/span> (<\/span>errno ==<\/span> EAGAIN ||<\/span> errno ==<\/span> EWOULDBLOCK)<\/span> {<\/span>
    \n \/\/ \u672c\u8f6e\u63a5\u5165\u7ed3\u675f\u3002<\/span>
    \n}<\/span><\/p>\n

    \u6210\u529f\u6761\u4ef6\u662f fd >= 0，\u4e0d\u662f fd > 0\u3002\u63cf\u8ff0\u7b26 0 \u540c\u6837\u5408\u6cd5\u3002Linux \u4e0a\u666e\u901a accept() \u8fd4\u56de\u7684\u65b0 socket \u4e5f\u4e0d\u80fd\u5047\u8bbe\u7ee7\u627f\u76d1\u542c socket \u7684\u975e\u963b\u585e\u5c5e\u6027；accept4() \u76f4\u63a5\u8bbe\u7f6e\u4e24\u4e2a\u6807\u5fd7，\u80fd\u8ba9\u8fd9\u4e2a\u7ea6\u675f\u6e05\u695a\u5730\u843d\u5728\u521b\u5efa\u70b9\u3002accept \u624b\u518c<\/p>\n

    4.2 \u5931\u8d25\u65f6\u4e0d\u80fd\u7559\u4e0b\u534a\u6ce8\u518c\u8fde\u63a5<\/h4>\n

    \u5efa\u7acb\u4e00\u4e2a\u5e94\u7528\u5c42\u8fde\u63a5\u81f3\u5c11\u6d89\u53ca：\u6301\u6709 fd\u3001\u521b\u5efa\u5bf9\u8c61\u3001\u52a0\u5165\u7ba1\u7406\u8868\u3001\u5411 epoll \u6ce8\u518c\u3002\u4efb\u4f55\u4e00\u6b65\u5931\u8d25，\u90fd\u8981\u6709\u660e\u786e\u7684\u56de\u6536\u8def\u5f84\u3002<\/p>\n

    \u793a\u4f8b\u5148\u7531 Connection \u6301\u6709 fd，\u518d\u5c06\u5bf9\u8c61\u653e\u5165\u8868；\u82e5 EPOLL_CTL_ADD \u5931\u8d25，\u79fb\u9664\u8868\u9879\u5e76\u629b\u51fa\u9519\u8bef，\u5c40\u90e8\u667a\u80fd\u6307\u9488\u6700\u7ec8\u91ca\u653e fd\u3002\u6210\u529f\u540e\u624d\u8fdb\u5165\u6b63\u5e38\u4e8b\u4ef6\u5206\u6d3e\u3002<\/p>\n

    \u5bf9\u6682\u65f6\u7684\u8fde\u63a5\u4e2d\u6b62\u6216 Linux \u63a5\u5165\u9636\u6bb5\u53ef\u91cd\u8bd5\u7f51\u7edc\u9519\u8bef，\u7ee7\u7eed\u63a5\u53d7\u4e0b\u4e00\u6761；\u5bf9 EMFILE \u7b49\u8d44\u6e90\u8017\u5c3d\u95ee\u9898，\u672c\u4f8b\u91c7\u7528\u7ec8\u6b62\u670d\u52a1\u7684\u6559\u5b66\u7b56\u7565\u3002\u6b63\u5f0f\u670d\u52a1\u901a\u5e38\u8fd8\u9700\u8981\u4fdd\u7559 fd\u3001\u63a5\u5165\u9000\u907f\u548c\u91cd\u8bd5\u5b9a\u65f6\u5668，\u4e0d\u80fd\u5728 ET \u56de\u8c03\u91cc\u968f\u610f break \u540e\u671f\u5f85\u5fc5\u7136\u518d\u88ab\u53eb\u9192\u3002<\/p>\n<\/p>\n

    \u4e94\u3001\u8bfb\u5230 EAGAIN，\u4e0e\u8bfb\u5230\u4e00\u4e2a\u5b8c\u6574\u8bf7\u6c42<\/h3>\n

    5.1 \u5148\u6309\u8fd4\u56de\u503c\u5206\u7c7b，\u518d\u51b3\u5b9a\u4e0b\u4e00\u6b65<\/h4>\n\nrecv \u7684\u7ed3\u679c\u542b\u4e49\u672c\u4f8b\u52a8\u4f5c<\/tr>\n\n\n\n\n\n\n
    n > 0<\/td>\n\u6536\u5230 n \u5b57\u8282<\/td>\n\u6309\u957f\u5ea6\u8ffd\u52a0，\u89e3\u6790\u5b8c\u6574\u8bf7\u6c42，\u7ee7\u7eed\u8bfb<\/td>\n<\/tr>\n
    n == 0<\/td>\nTCP \u5bf9\u7aef\u6709\u5e8f\u7ed3\u675f\u53d1\u9001<\/td>\n\u6807\u8bb0 EOF，\u5904\u7406\u5269\u4f59\u534a\u5305，\u6392\u7a7a\u54cd\u5e94<\/td>\n<\/tr>\n
    n < 0 \u4e14 EINTR<\/td>\n\u64cd\u4f5c\u88ab\u4fe1\u53f7\u6253\u65ad<\/td>\n\u91cd\u8bd5<\/td>\n<\/tr>\n
    n < 0 \u4e14 EAGAIN\/EWOULDBLOCK<\/td>\n\u5f53\u524d\u6ca1\u6709\u66f4\u591a\u53ef\u8bfb\u5b57\u8282<\/td>\n\u7ed3\u675f\u672c\u8f6e\u8bfb\u53d6<\/td>\n<\/tr>\n
    \u5176\u4ed6\u9519\u8bef<\/td>\n\u8fde\u63a5\u65e0\u6cd5\u6309\u6b63\u5e38\u8def\u5f84\u7ee7\u7eed<\/td>\n\u6e05\u7406\u8fde\u63a5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u4e0d\u8981\u5148\u770b errno，\u518d\u5224\u65ad recv() \u662f\u5426\u6210\u529f\u3002\u5b83\u4e0d\u662f\u6bcf\u6b21\u8c03\u7528\u90fd\u4f1a\u6e05\u96f6\u7684\u201c\u5f53\u524d\u72b6\u6001\u680f\u201d，\u53ea\u6709\u8fd4\u56de\u503c\u6307\u793a\u5931\u8d25\u65f6\u624d\u6709\u76f8\u5e94\u610f\u4e49\u3002recv \u624b\u518c<\/p>\n

    ssize_t n =<\/span> recv<\/span>(<\/span>c.<\/span>fd,<\/span> buf,<\/span> sizeof<\/span>(<\/span>buf)<\/span>,<\/span> 0<\/span>)<\/span>;<\/span>
    \nif<\/span> (<\/span>n ><\/span> 0<\/span>)<\/span> c.<\/span>input.<\/span>append<\/span>(<\/span>buf,<\/span> static_cast<\/span><<\/span>std::<\/span>size_t><\/span><\/span><\/span>(<\/span>n)<\/span>)<\/span>;<\/span><\/p>\n

    \u8fd9\u91cc\u4f7f\u7528\u663e\u5f0f\u957f\u5ea6\u3002std::string(buf) \u6216 input += buf \u4f1a\u6309 C \u5b57\u7b26\u4e32\u89c4\u5219\u5bfb\u627e \\\\0，\u65e2\u4e0d\u80fd\u8868\u8fbe\u4e00\u822c\u5b57\u8282\u6d41，\u4e5f\u53ef\u80fd\u8d8a\u8fc7\u672c\u6b21\u6709\u6548\u6570\u636e\u7684\u8fb9\u754c\u3002<\/p>\n

    5.2 EAGAIN \u4e0d\u662f\u6d88\u606f\u7ed3\u675f\u7b26<\/h4>\n

    \u5ba2\u6237\u7aef\u53ef\u80fd\u53ea\u53d1\u9001\u4e86\u534a\u6761\u8bf7\u6c42，\u7136\u540e\u505c\u4e86\u4e00\u79d2\u3002\u670d\u52a1\u7aef\u8bfb\u5230 EAGAIN，\u53ea\u80fd\u8bf4\u660e\u6b64\u523b\u5185\u6838\u63a5\u6536\u7f13\u51b2\u533a\u6ca1\u6709\u66f4\u591a\u53ef\u53d6\u6570\u636e，\u4e0d\u80fd\u8bf4\u660e\u5e94\u7528\u5c42\u8bf7\u6c42\u5b8c\u6574\u3002<\/p>\n

    \u53cd\u8fc7\u6765，\u4e00\u6b21 recv() \u4e5f\u53ef\u80fd\u8bfb\u5230\u4e09\u6761\u8bf7\u6c42\u52a0\u534a\u6761\u3002\u7f51\u7edc\u5206\u6bb5\u3001\u5e94\u7528\u8c03\u7528\u6b21\u6570\u4e0e\u4e1a\u52a1\u6d88\u606f\u6570\u91cf\u4e4b\u95f4，\u6ca1\u6709\u4e00\u4e00\u5bf9\u5e94\u5173\u7cfb\u3002\u6211\u4eec\u5fc5\u987b\u628a\u5df2\u7ecf\u8bfb\u5230\u7684\u5b57\u8282\u7559\u5728 input，\u7531\u534f\u8bae\u89c4\u5219\u51b3\u5b9a\u4f55\u65f6\u53d6\u8d70\u4e00\u6761\u6d88\u606f\u3002<\/p>\n

    5.3 \u6536\u5230 FIN，\u4e5f\u53ef\u80fd\u8fd8\u6709\u5e94\u7b54\u6ca1\u53d1\u5b8c<\/h4>\n

    \u5ba2\u6237\u7aef\u53ef\u4ee5\u5148\u53d1\u9001\u8bf7\u6c42，\u518d\u6267\u884c shutdown(SHUT_WR)，\u8868\u793a\u201c\u4e0d\u518d\u53d1\u9001\u201d，\u540c\u65f6\u7ee7\u7eed\u63a5\u6536\u670d\u52a1\u5668\u54cd\u5e94\u3002\u82e5\u670d\u52a1\u7aef\u4e00\u770b\u5230 EPOLLRDHUP \u5c31\u76f4\u63a5\u5173\u95ed，\u53ef\u80fd\u4e22\u6389\u5df2\u7ecf\u6536\u5230\u7684\u8bf7\u6c42\u6216\u5c1a\u672a\u53d1\u9001\u7684\u7ed3\u679c\u3002<\/p>\n

    \u672c\u4f8b\u628a\u6302\u65ad\u63d0\u793a\u9001\u8fdb\u8bfb\u53d6\u8def\u5f84，\u7528 recv() \u6d88\u8d39\u6570\u636e\u5e76\u786e\u8ba4 EOF；\u968f\u540e\u5173\u95ed\u8bfb\u5173\u6ce8，\u7ee7\u7eed\u53d1\u9001\u5df2\u6709\u7ed3\u679c，\u6700\u540e\u518d\u5173\u95ed\u6574\u4e2a\u8fde\u63a5\u3002EPOLLRDHUP\u3001EPOLLHUP \u4e0e\u6570\u636e\u53ef\u8bfb\u53ef\u80fd\u540c\u65f6\u51fa\u73b0，\u4e0d\u80fd\u628a\u5b83\u4eec\u7406\u89e3\u6210\u201c\u7f13\u51b2\u533a\u4e00\u5b9a\u4e3a\u7a7a\u201d\u3002epoll_ctl \u624b\u518c<\/p>\n<\/p>\n

    \u516d\u3001\u534f\u8bae\u89e3\u6790\u4e0e\u4e1a\u52a1\u5904\u7406\u600e\u6837\u5206\u5c42<\/h3>\n

    6.1 \u9009\u4e00\u4e2a\u8db3\u591f\u7b80\u5355\u7684\u534f\u8bae<\/h4>\n

    \u6bcf\u4e2a\u8bf7\u6c42\u4ee5\u6362\u884c\u7b26\u7ed3\u5c3e，\u5185\u5bb9\u662f\u201c\u6574\u6570 \u8fd0\u7b97\u7b26 \u6574\u6570\u201d\u3002\u64cd\u4f5c\u6570\u9650\u5b9a\u5728 [-1000000000, 1000000000]，\u652f\u6301 + – * \/\u3002\u670d\u52a1\u5668\u8fd4\u56de\u4e00\u884c OK \u7ed3\u679c \u6216 ERR \u539f\u56e0\u3002<\/p>\n

    \u8bf7\u6c42：12 + 30\\\\n \u54cd\u5e94：OK 42\\\\n
    \n\u8bf7\u6c42：9 \/ 0\\\\n \u54cd\u5e94：ERR divide_by_zero\\\\n
    \n\u8bf7\u6c42：7 * -8\\\\n \u54cd\u5e94：OK -56\\\\n<\/p>\n

    \u5355\u884c\u6700\u5927 256 \u5b57\u8282，\u4e0d\u5305\u62ec\u7ec8\u6b62\u6362\u884c\u3002\u6574\u6570\u9664\u6cd5\u6309 C++ \u89c4\u5219\u5411\u96f6\u622a\u65ad\u3002\u9650\u5236\u64cd\u4f5c\u6570\u8303\u56f4，\u4f7f\u4e58\u6cd5\u7ed3\u679c\u4e5f\u80fd\u653e\u5165\u6709\u7b26\u53f7 64 \u4f4d\u6574\u6570，\u907f\u514d\u8ba9\u7b97\u672f\u6ea2\u51fa\u63a9\u76d6\u7f51\u7edc\u673a\u5236\u3002<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    6.2 \u56db\u6b65\u8d70，\u522b\u628a\u4e1a\u52a1\u5199\u8fdb recv \u5206\u652f<\/h4>\n

    \u8bfb\u53d6\u5c42\u8d1f\u8d23\u83b7\u5f97\u5b57\u8282；\u534f\u8bae\u5c42\u8d1f\u8d23\u67e5\u627e \\\\n \u5e76\u53d6\u51fa\u5b8c\u6574\u884c；\u8ba1\u7b97\u5c42\u8d1f\u8d23\u6821\u9a8c\u5b57\u6bb5\u4e0e\u8ba1\u7b97；\u54cd\u5e94\u5c42\u8d1f\u8d23\u628a\u7ed3\u679c\u7f16\u7801\u540e\u653e\u5165\u8f93\u51fa\u7f13\u51b2\u3002<\/p>\n

    \u4f8b\u5982\u7f13\u51b2\u533a\u5f53\u524d\u4e3a 1 + 2\\\\n3 *，\u89e3\u6790\u5668\u53d6\u51fa\u7b2c\u4e00\u6761，\u7559\u4e0b 3 *\u3002\u4e0b\u8f6e\u8ffd\u52a0 4\\\\n，\u5269\u4f59\u5b57\u8282\u624d\u80fd\u6210\u4e3a\u7b2c\u4e8c\u6761\u5b8c\u6574\u8bf7\u6c42\u3002\u6bcf\u6210\u529f\u53d6\u51fa\u4e00\u6761\u540e\u7ee7\u7eed\u89e3\u6790，\u76f4\u5230\u6ca1\u6709\u5b8c\u6574\u884c\u3002<\/p>\n

    \u8bed\u6cd5\u9519\u8bef\u7684\u4e00\u6574\u884c\u4f1a\u5f97\u5230 ERR format，\u89e3\u6790\u4f4d\u7f6e\u5df2\u7ecf\u8d8a\u8fc7\u8be5\u884c，\u56e0\u6b64\u4e0b\u4e00\u6761\u5408\u6cd5\u8bf7\u6c42\u53ef\u4ee5\u7ee7\u7eed\u5904\u7406\u3002\u6ca1\u6709\u6362\u884c\u4e14\u8d85\u8fc7\u4e0a\u9650\u3001\u6216\u8005\u67d0\u4e00\u6574\u884c\u8d85\u8fc7\u4e0a\u9650\u65f6，\u76f4\u63a5\u65ad\u5f00；\u8fd9\u5c5e\u4e8e\u8fde\u63a5\u7ea7\u534f\u8bae\u8fdd\u89c4，\u4e0d\u8ba9\u5ba2\u6237\u7aef\u65e0\u9650\u5360\u7528\u8f93\u5165\u7f13\u51b2\u3002<\/p>\n

    6.3 EOF \u65f6\u7684\u534a\u5305\u4e5f\u8981\u6709\u89c4\u5219<\/h4>\n

    \u5982\u679c\u8bfb\u53d6\u5df2\u7ecf\u7ed3\u675f，input \u4ecd\u6b8b\u7559\u672a\u4ee5\u6362\u884c\u7ed3\u675f\u7684\u5185\u5bb9，\u8fd9\u4e9b\u5b57\u8282\u4e0d\u53ef\u80fd\u518d\u62fc\u6210\u5b8c\u6574\u8bf7\u6c42\u3002\u672c\u4f8b\u8ffd\u52a0 ERR truncated\\\\n，\u7136\u540e\u6392\u7a7a\u5df2\u6709\u8f93\u51fa\u5e76\u5173\u95ed\u3002<\/p>\n

    \u5047\u8bbe\u6536\u5230 1 + 2\\\\n9 + \u540e EOF，\u9884\u671f\u54cd\u5e94\u987a\u5e8f\u662f OK 3\\\\nERR truncated\\\\n\u3002\u8fd9\u6761\u89c4\u5219\u65e2\u8ba9\u5b9e\u9a8c\u5bb9\u6613\u89c2\u5bdf，\u4e5f\u9632\u6b62\u201c\u6700\u540e\u4e00\u4e2a\u4e0d\u5b8c\u6574\u8bf7\u6c42\u6084\u6084\u6d88\u5931\u201d\u3002\u5176\u4ed6\u534f\u8bae\u53ef\u4ee5\u9009\u62e9\u76f4\u63a5\u4e22\u5f03，\u4f46\u5fc5\u987b\u5199\u6e05\u695a\u3002<\/p>\n

    6.4 \u624b\u52a8\u8ddf\u8e2a\u4e00\u6b21\u8de8\u4e8b\u4ef6\u5904\u7406<\/h4>\n

    \u53ea\u770b\u6bcf\u4e2a\u51fd\u6570，\u5f88\u5bb9\u6613\u89c9\u5f97\u5b83\u4eec\u90fd\u5f88\u7b80\u5355；\u771f\u6b63\u5bb9\u6613\u51fa\u9519\u7684\u662f\u51fd\u6570\u4e4b\u95f4\u7684\u72b6\u6001\u4ea4\u63a5\u3002\u4e0b\u9762\u7528\u540c\u4e00\u6761\u8fde\u63a5\u8d70\u4e00\u904d\u5b8c\u6574\u8fc7\u7a0b\u3002\u8868\u4e2d\u7684\u5b57\u7b26\u4e32\u90fd\u7528\u8f6c\u4e49\u5f62\u5f0f\u5c55\u793a，\\\\n \u8868\u793a\u5b9e\u9645\u6362\u884c\u5b57\u8282\u3002<\/p>\n\n\u65f6\u523b\u672c\u8f6e\u53d1\u751f\u7684\u4e8b\u5fc5\u987b\u4fdd\u7559\u6216\u66f4\u65b0\u7684\u72b6\u6001<\/tr>\n\n\n\n\n\n\n\n\n
    \u7b2c\u4e00\u6b21\u53ef\u8bfb<\/td>\n\u6536\u5230 12 +，\u968f\u540e EAGAIN<\/td>\ninput = "12 +"，\u6ca1\u6709\u54cd\u5e94<\/td>\n<\/tr>\n
    \u7b2c\u4e8c\u6b21\u53ef\u8bfb<\/td>\n\u6536\u5230 30\\\\n9 \/ 0\\\\n<\/td>\n\u63d0\u53d6\u4e24\u6761\u5b8c\u6574\u8bf7\u6c42，\u6e05\u7a7a\u5df2\u6d88\u8d39\u8f93\u5165<\/td>\n<\/tr>\n
    \u4e1a\u52a1\u5904\u7406<\/td>\n\u5f97\u5230\u4e24\u4e2a\u8ba1\u7b97\u7ed3\u679c<\/td>\n\u4f9d\u6b21\u8ffd\u52a0 OK 42\\\\n\u3001ERR divide_by_zero\\\\n<\/td>\n<\/tr>\n
    \u5c1d\u8bd5\u53d1\u9001<\/td>\n\u53ea\u63a5\u53d7\u90e8\u5206\u5b57\u8282<\/td>\nsent \u589e\u52a0，\u672a\u53d1\u9001\u90e8\u5206\u4ecd\u7559\u5728 output<\/td>\n<\/tr>\n
    \u53d1\u9001\u53d7\u963b<\/td>\nsend \u8fd4\u56de EAGAIN<\/td>\n\u589e\u52a0\u5199\u5173\u6ce8，\u7136\u540e\u4ea4\u56de\u4e8b\u4ef6\u5faa\u73af<\/td>\n<\/tr>\n
    \u540e\u7eed\u53ef\u5199<\/td>\n\u4ece sent \u4f4d\u7f6e\u7ee7\u7eed\u53d1\u9001<\/td>\n\u6392\u7a7a\u540e\u6e05\u7a7a output\u3001\u91cd\u7f6e sent\u3001\u53d6\u6d88\u5199\u5173\u6ce8<\/td>\n<\/tr>\n
    \u5bf9\u7aef\u7ed3\u675f\u53d1\u9001<\/td>\nrecv \u8fd4\u56de 0<\/td>\n\u6807\u8bb0 eof；\u82e5\u8f93\u51fa\u5df2\u7a7a，\u5219\u5173\u95ed\u8fde\u63a5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u5173\u952e\u5728\u4e8e\u6bcf\u4e00\u884c\u53ea\u627f\u8bfa\u5f53\u524d\u9636\u6bb5\u771f\u6b63\u5b8c\u6210\u7684\u4e8b\u60c5\u3002\u8bfb\u53d6\u5c42\u53ea\u627f\u8bfa\u83b7\u5f97\u5b57\u8282，\u89e3\u6790\u5c42\u53ea\u627f\u8bfa\u5f97\u5230\u5b8c\u6574\u8bf7\u6c42，\u53d1\u9001\u5c42\u53ea\u627f\u8bfa\u5185\u6838\u63a5\u53d7\u4e86\u591a\u5c11\u5b57\u8282\u3002<\/p>\n

    \u5047\u5982\u628a\u8f93\u51fa\u5b57\u7b26\u4e32\u4e00\u4ea4\u7ed9 send() \u5c31\u6e05\u7a7a，\u7b2c\u56db\u884c\u7684\u5269\u4f59\u6570\u636e\u4f1a\u4e22\u5931；\u5047\u5982\u7b2c\u4e00\u884c\u9047\u5230 EAGAIN \u5c31\u6e05\u7a7a\u8f93\u5165，\u7b2c\u4e8c\u884c\u4f1a\u4ece 30 \u5f00\u59cb\u89e3\u6790；\u5047\u5982\u7b2c\u516d\u884c\u5fd8\u8bb0\u53d6\u6d88\u5199\u5173\u6ce8，\u8ba2\u9605\u72b6\u6001\u5c31\u4e0d\u518d\u53cd\u6620\u771f\u5b9e\u9700\u6c42\u3002\u6cbf\u8fd9\u5f20\u8868\u68c0\u67e5，\u6bd4\u53ea\u95ee\u201c\u4e3a\u4ec0\u4e48\u5ba2\u6237\u7aef\u6ca1\u6536\u5230\u7ed3\u679c\u201d\u66f4\u5bb9\u6613\u5b9a\u4f4d\u95ee\u9898\u3002<\/p>\n<\/p>\n

    \u4e03\u3001\u53d1\u9001\u7f13\u51b2\u4e0e EPOLLOUT \u7684\u5f00\u5173<\/h3>\n

    7.1 send \u6210\u529f，\u4e0d\u7b49\u4e8e\u53d1\u9001\u5b8c\u6574<\/h4>\n

    send() \u8fd4\u56de\u6b63\u6570，\u8868\u793a\u672c\u6b21\u63a5\u53d7\u4e86\u8fd9\u4e48\u591a\u5b57\u8282；\u5b83\u4e0d\u4fdd\u8bc1\u7b49\u4e8e\u8bf7\u6c42\u957f\u5ea6，\u4e5f\u4e0d\u4ee3\u8868\u5bf9\u7aef\u5e94\u7528\u5df2\u7ecf\u6536\u5230\u5e76\u5904\u7406\u3002\u8f93\u51fa\u7f13\u51b2\u8981\u4fdd\u5b58\u5c1a\u672a\u4ea4\u7ed9\u5185\u6838\u7684\u90e8\u5206\u3002send \u624b\u518c<\/p>\n

    \u672c\u6587\u7528 sent \u8bb0\u5f55\u504f\u79fb，\u53d1\u9001\u8303\u56f4\u59cb\u7ec8\u4e3a：<\/p>\n

    c.<\/span>output.<\/span>data<\/span>(<\/span>)<\/span> +<\/span> c.<\/span>sent \/\/ \u672a\u53d1\u9001\u90e8\u5206\u8d77\u70b9<\/span>
    \nc.<\/span>output.<\/span>size<\/span>(<\/span>)<\/span> –<\/span> c.<\/span>sent \/\/ \u672a\u53d1\u9001\u90e8\u5206\u957f\u5ea6<\/span><\/p>\n

    \u6bcf\u6b21\u5f97\u5230 n > 0 \u5c31\u589e\u52a0\u504f\u79fb\u3002\u9047\u5230 EINTR \u91cd\u8bd5；\u9047\u5230 EAGAIN \u4fdd\u5b58\u8fdb\u5ea6\u5e76\u5173\u6ce8\u53ef\u5199；\u5168\u90e8\u53d1\u9001\u540e\u6e05\u7a7a\u7f13\u51b2\u3001\u628a\u504f\u79fb\u5f52\u96f6\u3002<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    7.2 \u4e3a\u4ec0\u4e48\u751f\u6210\u54cd\u5e94\u540e\u53ef\u4ee5\u76f4\u63a5\u5c1d\u8bd5\u53d1\u9001<\/h4>\n

    socket \u5df2\u7ecf\u662f\u975e\u963b\u585e\u7684，\u5c1d\u8bd5 send() \u4e0d\u8981\u6c42\u5148\u83b7\u5f97\u4e00\u6b21 EPOLLOUT \u901a\u77e5\u3002\u5e38\u89c1\u7b56\u7565\u662f\u751f\u6210\u5e94\u7b54\u540e\u7acb\u5373\u8c03\u7528\u53d1\u9001\u51fd\u6570：\u80fd\u53d1\u5b8c\u5c31\u7ed3\u675f；\u6682\u65f6\u53d1\u4e0d\u52a8\u624d\u8ba2\u9605\u5199\u4e8b\u4ef6\u3002<\/p>\n

    \u8fd9\u6837\u505a\u4e5f\u907f\u514d\u53ea\u4f9d\u8d56\u201c\u4e0b\u4e00\u6b21\u53ef\u5199\u8fb9\u6cbf\u201d\u63a8\u8fdb\u65b0\u4ea7\u751f\u7684\u8f93\u51fa\u3002\u5e94\u7528\u65b0\u589e\u5f85\u53d1\u6570\u636e，\u4e0d\u610f\u5473\u7740\u5185\u6838 socket \u7684\u53ef\u5199\u72b6\u6001\u521a\u53d1\u751f\u53d8\u5316\u3002<\/p>\n

    7.3 EPOLLOUT \u5e94\u8be5\u8ddf\u7740\u5f85\u53d1\u9001\u6570\u636e\u8d70<\/h4>\n\n\u5e94\u7528\u8f93\u51fa\u72b6\u6001\u8ba2\u9605\u7b56\u7565<\/tr>\n\n\n\n\n\n\n
    \u6ca1\u6709\u5f85\u53d1\u9001\u6570\u636e<\/td>\n\u4e0d\u5173\u6ce8 EPOLLOUT<\/td>\n<\/tr>\n
    \u7acb\u5373\u53d1\u9001\u6210\u529f\u6392\u7a7a<\/td>\n\u4fdd\u6301\u6216\u6062\u590d\u53ea\u8bfb\u5173\u6ce8<\/td>\n<\/tr>\n
    \u53d1\u9001\u9047\u5230 EAGAIN，\u8fd8\u6709\u5269\u4f59<\/td>\n\u589e\u52a0 EPOLLOUT<\/td>\n<\/tr>\n
    \u5199\u56de\u8c03\u628a\u7f13\u51b2\u53d1\u7a7a<\/td>\n\u79fb\u9664 EPOLLOUT<\/td>\n<\/tr>\n
    \u5df2 EOF \u4e14\u7f13\u51b2\u53d1\u7a7a<\/td>\n\u5173\u95ed\u8fde\u63a5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u5c24\u5176\u5728 LT \u6a21\u5f0f\u4e0b，\u53ef\u5199\u6761\u4ef6\u6301\u7eed\u6ee1\u8db3\u53c8\u4e00\u76f4\u8ba2\u9605 EPOLLOUT，\u4f1a\u9020\u6210\u65e0\u610f\u4e49\u5524\u9192\u3002ET \u7684\u901a\u77e5\u8868\u73b0\u4e0d\u540c，\u4e0d\u80fd\u7b3c\u7edf\u8bf4\u201cET \u4e0b\u4e5f\u5fc5\u7136\u6301\u7eed\u7a7a\u8f6c\u201d，\u4f46\u8ba9\u8ba2\u9605\u51c6\u786e\u53cd\u6620\u5e94\u7528\u9700\u8981，\u4ecd\u662f\u6e05\u6670\u4e14\u7a33\u5065\u7684\u8bbe\u8ba1\u3002<\/p>\n

    7.4 \u53d1\u9001\u8def\u5f84\u4e0a\u7684\u4e09\u4e2a\u7ec6\u8282<\/h4>\n

    \u7b2c\u4e00，\u4f7f\u7528 MSG_NOSIGNAL，\u907f\u514d\u7ed9\u5df2\u65ad\u5f00\u7684\u8fde\u63a5\u53d1\u9001\u65f6\u7531 SIGPIPE \u7ed3\u675f\u6574\u4e2a\u8fdb\u7a0b，\u540c\u65f6\u4ecd\u68c0\u67e5 EPIPE \u7b49\u8fd4\u56de\u9519\u8bef\u3002<\/p>\n

    \u7b2c\u4e8c，\u975e\u7a7a\u53d1\u9001\u82e5\u610f\u5916\u8fd4\u56de 0，\u4e0d\u80fd\u539f\u5730\u65e0\u9650\u5faa\u73af\u3002\u793a\u4f8b\u91c7\u7528\u5173\u95ed\u7b56\u7565，\u4f7f\u201c\u6ca1\u6709\u8fdb\u5c55\u201d\u6709\u660e\u786e\u51fa\u53e3\u3002<\/p>\n

    \u7b2c\u4e09，\u5f85\u53d1\u6570\u636e\u8fbe\u5230 64 KiB \u4e0a\u9650\u540e\u65ad\u5f00\u6162\u8fde\u63a5\u3002\u8fd9\u4e2a\u4e0a\u9650\u7ea6\u675f\u7684\u662f\u5e94\u7528\u5c42\u5c1a\u672a\u53d1\u9001\u7684\u5b57\u8282，\u4e0d\u662f\u6240\u6709\u5185\u5b58\u5360\u7528；std::string \u5bb9\u91cf\u3001\u5185\u6838\u7f13\u51b2\u548c\u8fde\u63a5\u8868\u4e5f\u4f1a\u6d88\u8017\u8d44\u6e90\u3002<\/p>\n

    7.5 \u4fee\u6539\u4e8b\u4ef6\u63a9\u7801\u65f6，\u4fdd\u7559\u4ecd\u7136\u6709\u6548\u7684\u6761\u4ef6<\/h4>\n

    \u65b0\u589e\u5199\u5173\u6ce8\u4e0d\u662f\u628a\u63a9\u7801\u7b80\u5355\u66ff\u6362\u6210 EPOLLOUT\u3002\u8fde\u63a5\u4ecd\u53ef\u63a5\u6536\u8bf7\u6c42\u65f6，\u8fd8\u9700\u8981 EPOLLIN；ET \u914d\u7f6e\u4e5f\u4e0d\u80fd\u65e0\u610f\u4e22\u6389\u3002\u5426\u5219\u4e00\u4e2a\u770b\u4f3c\u6b63\u786e\u7684\u53d1\u9001\u4f18\u5316，\u53ef\u80fd\u8ba9\u540e\u7eed\u8bfb\u53d6\u518d\u4e5f\u8fdb\u4e0d\u6765\u3002<\/p>\n

    \u672c\u6587\u7684 refresh() \u6839\u636e\u8fde\u63a5\u72b6\u6001\u91cd\u65b0\u8ba1\u7b97\u76ee\u6807\u63a9\u7801：\u5148\u4fdd\u7559 ET；\u5c1a\u672a EOF \u65f6\u589e\u52a0\u8bfb\u4e0e\u534a\u5173\u95ed\u5173\u6ce8；\u6709\u5f85\u53d1\u9001\u5b57\u8282\u65f6\u589e\u52a0\u5199\u5173\u6ce8\u3002\u65b0\u63a9\u7801\u4e0e\u65e7\u63a9\u7801\u4e00\u81f4\u5c31\u65e0\u9700\u8c03\u7528 MOD\u3002<\/p>\n

    \u8fd9\u4e00\u505a\u6cd5\u8ba9\u8ba2\u9605\u6210\u4e3a\u72b6\u6001\u7684\u7ed3\u679c，\u800c\u4e0d\u662f\u5206\u6563\u5728\u5404\u5904\u968f\u624b\u589e\u5220\u7684\u6807\u5fd7\u3002\u8c03\u8bd5\u65f6\u53ef\u4ee5\u628a\u201c\u5f53\u524d input\/output\u3001eof\/closed\u3001\u5b9e\u9645\u8ba2\u9605\u63a9\u7801\u201d\u4e00\u8d77\u6253\u5370，\u68c0\u67e5\u5b83\u4eec\u662f\u5426\u4e92\u76f8\u5339\u914d\u3002\u9047\u5230 MOD \u5931\u8d25\u65f6，\u672c\u6587\u9009\u62e9\u5173\u95ed\u8be5\u8fde\u63a5，\u4e0d\u7ee7\u7eed\u5047\u88c5\u8ba2\u9605\u6210\u529f\u3002<\/p>\n<\/p>\n

    \u516b\u3001\u5173\u95ed\u8fde\u63a5：\u6bd4\u8c03\u7528 close \u591a\u505a\u51e0\u6b65<\/h3>\n

    \u6e05\u7406\u8def\u5f84\u7edf\u4e00\u653e\u5728 close_connection() \u4e2d，\u6309\u7167\u201c\u6807\u8bb0\u5173\u95ed\u3001\u79fb\u9664 epoll \u5173\u6ce8\u3001\u5173\u95ed fd\u3001\u79fb\u9664\u8fde\u63a5\u8868\u9879\u201d\u6267\u884c\u3002fd \u968f\u540e\u6539\u6210 -1，\u907f\u514d\u6790\u6784\u65f6\u91cd\u590d\u5173\u95ed\u3002<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u6807\u8bb0\u5173\u95ed\u653e\u5728\u524d\u9762，\u4f7f\u91cd\u590d\u8fdb\u5165\u6e05\u7406\u8def\u5f84\u6210\u4e3a\u65e0\u64cd\u4f5c\u3002\u8fde\u63a5\u8868\u4e0d\u518d\u6301\u6709\u5bf9\u8c61\u540e，\u5f53\u524d\u4e8b\u4ef6\u5206\u6d3e\u4fdd\u7559\u7684\u5c40\u90e8 shared_ptr \u4ecd\u8ba9\u5bf9\u8c61\u6d3b\u5230\u672c\u8f6e\u7ed3\u675f；\u79bb\u5f00\u4f5c\u7528\u57df\u540e，\u6700\u540e\u4e00\u4e2a\u5f15\u7528\u624d\u91ca\u653e\u5185\u5b58\u3002<\/p>\n

    \u4e0d\u8981\u628a\u201c\u4ece map \u5220\u9664\u201d\u548c\u201c\u7acb\u523b delete \u88f8\u6307\u9488\u201d\u968f\u610f\u5206\u6563\u5728\u591a\u4e2a\u56de\u8c03\u4e2d\u3002\u6700\u5371\u9669\u7684\u4ee3\u7801\u901a\u5e38\u957f\u8fd9\u6837：\u8bfb\u56de\u8c03\u5220\u9664\u5bf9\u8c61，\u63a7\u5236\u6d41\u8fd4\u56de\u4e8b\u4ef6\u5faa\u73af，\u4e8b\u4ef6\u5faa\u73af\u7ee7\u7eed\u901a\u8fc7\u540c\u4e00\u4e2a\u6307\u9488\u68c0\u67e5\u5199\u56de\u8c03\u3002<\/p>\n

    \u8fd8\u8981\u6ce8\u610f，\u5173\u95ed fd \u4e0e\u91ca\u653e C++ \u5bf9\u8c61\u662f\u4e24\u4ef6\u4e8b\u3002\u5bf9\u8c61\u5ef6\u8fdf\u91ca\u653e\u5e76\u4e0d\u610f\u5473\u7740\u5141\u8bb8\u5ef6\u8fdf\u5173\u95ed\u4e00\u4e2a\u5df2\u7ecf\u786e\u5b9a\u5931\u6548\u7684 socket；\u53cd\u8fc7\u6765，fd \u5df2\u7ecf\u5173\u95ed，\u4e5f\u4e0d\u610f\u5473\u7740\u6301\u6709\u8be5\u5bf9\u8c61\u5f15\u7528\u7684\u4ee3\u7801\u53ef\u4ee5\u4e0d\u518d\u68c0\u67e5\u903b\u8f91\u72b6\u6001\u3002<\/p>\n

    \u672c\u6587\u6ca1\u6709\u901a\u8fc7 dup() \u590d\u5236 socket \u63cf\u8ff0\u7b26，\u56e0\u6b64\u6e05\u7406\u6d41\u7a0b\u6bd4\u8f83\u76f4\u63a5\u3002\u6b63\u5f0f\u6846\u67b6\u82e5\u5141\u8bb8\u63cf\u8ff0\u7b26\u522b\u540d，\u8fd8\u9700\u8981\u5398\u6e05 open file description \u4e0e epoll \u6ce8\u518c\u5173\u7cfb，\u4e0d\u80fd\u628a\u201c\u5173\u95ed\u4efb\u610f\u4e00\u4e2a\u6570\u5b57\u201d\u5f53\u6210\u6240\u6709\u89c2\u5bdf\u5173\u7cfb\u90fd\u7ed3\u675f\u3002<\/p>\n<\/p>\n

    \u4e5d\u3001\u5b8c\u6574 C++17 \u8ba1\u7b97\u5668\u670d\u52a1\u5668<\/h3>\n

    \u628a\u4e0b\u9762\u4ee3\u7801\u4fdd\u5b58\u4e3a reactor_server.cpp\u3002\u6587\u7ae0\u5305\u7684 code\/ \u4e2d\u63d0\u4f9b\u540c\u4e00\u4efd\u4ee3\u7801\u3002\u4e3a\u4fbf\u4e8e\u4ece\u5934\u8dd1\u901a，\u8fd9\u91cc\u7528\u5355\u6587\u4ef6\u5c55\u793a；\u9605\u8bfb\u65f6\u6cbf run \u2192 readable \u2192 receive \u2192 parse \u2192 flush \u8fd9\u6761\u8c03\u7528\u94fe\u770b，\u518d\u56de\u5934\u770b\u63a5\u5165\u548c\u6e05\u7406\u8def\u5f84\u3002<\/p>\n

    #<\/span>ifndef<\/span> _GNU_SOURCE<\/span><\/span>
    \n#<\/span>define<\/span> _GNU_SOURCE<\/span><\/span>
    \n#<\/span>endif<\/span><\/span>
    \n#<\/span>include<\/span> <arpa\/inet.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/epoll.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/socket.h><\/span><\/span>
    \n#<\/span>include<\/span> <unistd.h><\/span><\/span>
    \n#<\/span>include<\/span> <cerrno><\/span><\/span>
    \n#<\/span>include<\/span> <cstdint><\/span><\/span>
    \n#<\/span>include<\/span> <cstdlib><\/span><\/span>
    \n#<\/span>include<\/span> <cstring><\/span><\/span>
    \n#<\/span>include<\/span> <functional><\/span><\/span>
    \n#<\/span>include<\/span> <iostream><\/span><\/span>
    \n#<\/span>include<\/span> <memory><\/span><\/span>
    \n#<\/span>include<\/span> <sstream><\/span><\/span>
    \n#<\/span>include<\/span> <stdexcept><\/span><\/span>
    \n#<\/span>include<\/span> <string><\/span><\/span>
    \n#<\/span>include<\/span> <unordered_map><\/span><\/span><\/p>\n

    namespace<\/span> {<\/span>
    \nconstexpr<\/span> std::<\/span>size_t MAX_LINE =<\/span> 256<\/span>;<\/span>
    \nconstexpr<\/span> std::<\/span>size_t MAX_OUTPUT =<\/span> 64<\/span> *<\/span> 1024<\/span>;<\/span>
    \nconstexpr<\/span> std::<\/span>size_t MAX_CLIENTS =<\/span> 4096<\/span>;<\/span>
    \n[<\/span>[<\/span>noreturn]<\/span>]<\/span> void<\/span> fail<\/span>(<\/span>const<\/span> char<\/span>*<\/span> where)<\/span> {<\/span>
    \n throw<\/span> std::<\/span>runtime_error<\/span>(<\/span>std::<\/span>string<\/span>(<\/span>where)<\/span> +<\/span> ": "<\/span> +<\/span> std::<\/span>strerror<\/span>(<\/span>errno)<\/span>)<\/span>;<\/span>
    \n}<\/span>
    \nbool<\/span> again<\/span>(<\/span>)<\/span> {<\/span> return<\/span> errno ==<\/span> EAGAIN ||<\/span> errno ==<\/span> EWOULDBLOCK;<\/span> }<\/span><\/p>\n

    \/\/ Operands are bounded, so all supported results fit in int64_t.<\/span>
    \nstd::<\/span>string calculate<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> line)<\/span> {<\/span>
    \n std::<\/span>istringstream in<\/span>(<\/span>line)<\/span>;<\/span>
    \n std::<\/span>int64_t<\/span> a,<\/span> b,<\/span> result;<\/span>
    \n char<\/span> op;<\/span>
    \n if<\/span> (<\/span>!<\/span>(<\/span>in >><\/span> a >><\/span> op >><\/span> b)<\/span>)<\/span> return<\/span> "ERR format\\\\n"<\/span>;<\/span>
    \n in >><\/span> std::<\/span>ws;<\/span>
    \n if<\/span> (<\/span>!<\/span>in.<\/span>eof<\/span>(<\/span>)<\/span>)<\/span> return<\/span> "ERR format\\\\n"<\/span>;<\/span>
    \n constexpr<\/span> std::<\/span>int64_t<\/span> LIMIT =<\/span> 1000000000<\/span>;<\/span>
    \n if<\/span> (<\/span>a <<\/span> –<\/span>LIMIT ||<\/span> a ><\/span> LIMIT ||<\/span> b <<\/span> –<\/span>LIMIT ||<\/span> b ><\/span> LIMIT)<\/span>
    \n return<\/span> "ERR range\\\\n"<\/span>;<\/span>
    \n switch<\/span> (<\/span>op)<\/span> {<\/span>
    \n case<\/span> '+'<\/span>:<\/span> result =<\/span> a +<\/span> b;<\/span> break<\/span>;<\/span>
    \n case<\/span> '-'<\/span>:<\/span> result =<\/span> a –<\/span> b;<\/span> break<\/span>;<\/span>
    \n case<\/span> '*'<\/span>:<\/span> result =<\/span> a *<\/span> b;<\/span> break<\/span>;<\/span>
    \n case<\/span> '\/'<\/span>:<\/span> if<\/span> (<\/span>b ==<\/span> 0<\/span>)<\/span> return<\/span> "ERR divide_by_zero\\\\n"<\/span>;<\/span>
    \n result =<\/span> a \/<\/span> b;<\/span> break<\/span>;<\/span>
    \n default<\/span>:<\/span> return<\/span> "ERR operator\\\\n"<\/span>;<\/span>
    \n }<\/span>
    \n return<\/span> "OK "<\/span> +<\/span> std::<\/span>to_string<\/span>(<\/span>result)<\/span> +<\/span> "\\\\n"<\/span>;<\/span>
    \n}<\/span>
    \nstruct<\/span> Connection<\/span> {<\/span>
    \n explicit<\/span> Connection<\/span>(<\/span>int<\/span> socket)<\/span> :<\/span> fd<\/span>(<\/span>socket)<\/span> {<\/span>}<\/span>
    \n ~<\/span>Connection<\/span>(<\/span>)<\/span> {<\/span> if<\/span> (<\/span>fd >=<\/span> 0<\/span>)<\/span> ::<\/span>close<\/span>(<\/span>fd)<\/span>;<\/span> }<\/span>
    \n Connection<\/span>(<\/span>const<\/span> Connection&<\/span>)<\/span> =<\/span> delete<\/span>;<\/span>
    \n Connection&<\/span> operator<\/span>=<\/span>(<\/span>const<\/span> Connection&<\/span>)<\/span> =<\/span> delete<\/span>;<\/span>
    \n int<\/span> fd;<\/span>
    \n std::<\/span>uint64_t<\/span> id =<\/span> 0<\/span>;<\/span>
    \n std::<\/span>uint32_t<\/span> interests =<\/span> 0<\/span>;<\/span>
    \n std::<\/span>string input,<\/span> output;<\/span>
    \n std::<\/span>size_t sent =<\/span> 0<\/span>;<\/span>
    \n bool<\/span> eof =<\/span> false<\/span>,<\/span> closed =<\/span> false<\/span>;<\/span>
    \n std::<\/span>function<<\/span>void<\/span>(<\/span>Connection&<\/span>)<\/span>><\/span> readable,<\/span> writable;<\/span>
    \n}<\/span>;<\/span>
    \nstd::<\/span>shared_ptr<<\/span>Connection><\/span> hold_socket<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span>
    \n try<\/span> {<\/span> return<\/span> std::<\/span>make_shared<\/span><<\/span>Connection><\/span><\/span><\/span>(<\/span>fd)<\/span>;<\/span> }<\/span>
    \n catch<\/span> (<\/span>.<\/span>.<\/span>.<\/span>)<\/span> {<\/span> if<\/span> (<\/span>fd >=<\/span> 0<\/span>)<\/span> ::<\/span>close<\/span>(<\/span>fd)<\/span>;<\/span> throw<\/span>;<\/span> }<\/span>
    \n}<\/span>
    \nclass<\/span> Reactor<\/span> {<\/span>
    \npublic<\/span>:<\/span>
    \n explicit<\/span> Reactor<\/span>(<\/span>unsigned<\/span> short<\/span> port)<\/span> {<\/span>
    \n epfd_ =<\/span> ::<\/span>epoll_create1<\/span>(<\/span>EPOLL_CLOEXEC)<\/span>;<\/span>
    \n if<\/span> (<\/span>epfd_ <<\/span> 0<\/span>)<\/span> fail<\/span>(<\/span>"epoll_create1"<\/span>)<\/span>;<\/span>
    \n try<\/span> {<\/span>
    \n auto<\/span> listener =<\/span> hold_socket<\/span>(<\/span>
    \n ::<\/span>socket<\/span>(<\/span>AF_INET,<\/span> SOCK_STREAM |<\/span> SOCK_NONBLOCK |<\/span> SOCK_CLOEXEC,<\/span> 0<\/span>)<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>listener-><\/span>fd <<\/span> 0<\/span>)<\/span> fail<\/span>(<\/span>"socket"<\/span>)<\/span>;<\/span>
    \n int<\/span> yes =<\/span> 1<\/span>;<\/span>
    \n if<\/span> (<\/span>::<\/span>setsockopt<\/span>(<\/span>listener-><\/span>fd,<\/span> SOL_SOCKET,<\/span> SO_REUSEADDR,<\/span> &<\/span>yes,<\/span> sizeof<\/span>(<\/span>yes)<\/span>)<\/span> <<\/span> 0<\/span>)<\/span>
    \n fail<\/span>(<\/span>"setsockopt"<\/span>)<\/span>;<\/span>
    \n sockaddr_in addr{<\/span>}<\/span>;<\/span>
    \n addr.<\/span>sin_family =<\/span> AF_INET;<\/span>
    \n addr.<\/span>sin_port =<\/span> htons<\/span>(<\/span>port)<\/span>;<\/span>
    \n addr.<\/span>sin_addr.<\/span>s_addr =<\/span> htonl<\/span>(<\/span>INADDR_LOOPBACK)<\/span>;<\/span>
    \n if<\/span> (<\/span>::<\/span>bind<\/span>(<\/span>listener-><\/span>fd,<\/span> reinterpret_cast<\/span><<\/span>sockaddr*<\/span>><\/span><\/span><\/span>(<\/span>&<\/span>addr)<\/span>,<\/span> sizeof<\/span>(<\/span>addr)<\/span>)<\/span> <<\/span> 0<\/span>)<\/span>
    \n fail<\/span>(<\/span>"bind"<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>::<\/span>listen<\/span>(<\/span>listener-><\/span>fd,<\/span> SOMAXCONN)<\/span> <<\/span> 0<\/span>)<\/span> fail<\/span>(<\/span>"listen"<\/span>)<\/span>;<\/span>
    \n listener-><\/span>readable =<\/span> [<\/span>this<\/span>]<\/span>(<\/span>Connection&<\/span> c)<\/span> {<\/span> accept_all<\/span>(<\/span>c)<\/span>;<\/span> }<\/span>;<\/span>
    \n add<\/span>(<\/span>listener)<\/span>;<\/span> \/\/ Listener is connection id 1.<\/span>
    \n }<\/span> catch<\/span> (<\/span>.<\/span>.<\/span>.<\/span>)<\/span> {<\/span> ::<\/span>close<\/span>(<\/span>epfd_)<\/span>;<\/span> epfd_ =<\/span> –<\/span>1<\/span>;<\/span> throw<\/span>;<\/span> }<\/span>
    \n }<\/span>
    \n ~<\/span>Reactor<\/span>(<\/span>)<\/span> {<\/span> connections_.<\/span>clear<\/span>(<\/span>)<\/span>;<\/span> if<\/span> (<\/span>epfd_ >=<\/span> 0<\/span>)<\/span> ::<\/span>close<\/span>(<\/span>epfd_)<\/span>;<\/span> }<\/span>
    \n Reactor<\/span>(<\/span>const<\/span> Reactor&<\/span>)<\/span> =<\/span> delete<\/span>;<\/span>
    \n Reactor&<\/span> operator<\/span>=<\/span>(<\/span>const<\/span> Reactor&<\/span>)<\/span> =<\/span> delete<\/span>;<\/span>
    \n void<\/span> run<\/span>(<\/span>)<\/span> {<\/span>
    \n epoll_event ready[<\/span>128<\/span>]<\/span>;<\/span>
    \n for<\/span> (<\/span>;<\/span>;<\/span>)<\/span> {<\/span>
    \n int<\/span> n =<\/span> ::<\/span>epoll_wait<\/span>(<\/span>epfd_,<\/span> ready,<\/span> 128<\/span>,<\/span> –<\/span>1<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>n <<\/span> 0<\/span>)<\/span> {<\/span> if<\/span> (<\/span>errno ==<\/span> EINTR)<\/span> continue<\/span>;<\/span> fail<\/span>(<\/span>"epoll_wait"<\/span>)<\/span>;<\/span> }<\/span>
    \n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> n;<\/span> ++<\/span>i)<\/span> {<\/span>
    \n auto<\/span> found =<\/span> connections_.<\/span>find<\/span>(<\/span>ready[<\/span>i]<\/span>.<\/span>data.<\/span>u64)<\/span>;<\/span>
    \n if<\/span> (<\/span>found ==<\/span> connections_.<\/span>end<\/span>(<\/span>)<\/span>)<\/span> continue<\/span>;<\/span> \/\/ stale event<\/span>
    \n auto<\/span> c =<\/span> found-><\/span>second;<\/span> \/\/ Hold lifetime across callbacks.<\/span>
    \n std::<\/span>uint32_t<\/span> events =<\/span> ready[<\/span>i]<\/span>.<\/span>events;<\/span>
    \n if<\/span> (<\/span>events &<\/span> EPOLLERR)<\/span> {<\/span>
    \n if<\/span> (<\/span>c-><\/span>id ==<\/span> 1<\/span>)<\/span> throw<\/span> std::<\/span>runtime_error<\/span>(<\/span>"listener EPOLLERR"<\/span>)<\/span>;<\/span>
    \n close_connection<\/span>(<\/span>*<\/span>c)<\/span>;<\/span> continue<\/span>;<\/span>
    \n }<\/span>
    \n if<\/span> (<\/span>(<\/span>events &<\/span> (<\/span>EPOLLIN |<\/span> EPOLLRDHUP |<\/span> EPOLLHUP)<\/span>)<\/span> &&<\/span> c-><\/span>readable)<\/span>
    \n c-><\/span>readable<\/span>(<\/span>*<\/span>c)<\/span>;<\/span>
    \n if<\/span> (<\/span>!<\/span>c-><\/span>closed &&<\/span> (<\/span>events &<\/span> EPOLLOUT)<\/span> &&<\/span> c-><\/span>writable)<\/span>
    \n c-><\/span>writable<\/span>(<\/span>*<\/span>c)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n }<\/span>
    \nprivate<\/span>:<\/span>
    \n int<\/span> epfd_ =<\/span> –<\/span>1<\/span>;<\/span>
    \n std::<\/span>uint64_t<\/span> next_id_ =<\/span> 1<\/span>;<\/span>
    \n std::<\/span>unordered_map<<\/span>std::<\/span>uint64_t<\/span>,<\/span> std::<\/span>shared_ptr<<\/span>Connection>><\/span> connections_;<\/span>
    \n void<\/span> add<\/span>(<\/span>const<\/span> std::<\/span>shared_ptr<<\/span>Connection><\/span>&<\/span> c)<\/span> {<\/span>
    \n if<\/span> (<\/span>next_id_ ==<\/span> 0<\/span>)<\/span> throw<\/span> std::<\/span>runtime_error<\/span>(<\/span>"connection id exhausted"<\/span>)<\/span>;<\/span>
    \n c-><\/span>id =<\/span> next_id_++<\/span>;<\/span>
    \n c-><\/span>interests =<\/span> EPOLLIN |<\/span> EPOLLET |<\/span> EPOLLRDHUP;<\/span>
    \n connections_.<\/span>emplace<\/span>(<\/span>c-><\/span>id,<\/span> c)<\/span>;<\/span>
    \n epoll_event event{<\/span>}<\/span>;<\/span>
    \n event.<\/span>events =<\/span> c-><\/span>interests;<\/span>
    \n event.<\/span>data.<\/span>u64 =<\/span> c-><\/span>id;<\/span>
    \n if<\/span> (<\/span>::<\/span>epoll_ctl<\/span>(<\/span>epfd_,<\/span> EPOLL_CTL_ADD,<\/span> c-><\/span>fd,<\/span> &<\/span>event)<\/span> <<\/span> 0<\/span>)<\/span> {<\/span>
    \n connections_.<\/span>erase<\/span>(<\/span>c-><\/span>id)<\/span>;<\/span> fail<\/span>(<\/span>"epoll_ctl ADD"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n void<\/span> close_connection<\/span>(<\/span>Connection&<\/span> c)<\/span> {<\/span>
    \n if<\/span> (<\/span>c.<\/span>closed)<\/span> return<\/span>;<\/span>
    \n c.<\/span>closed =<\/span> true<\/span>;<\/span>
    \n \/\/ No dup() aliases are created; close also removes this epoll interest.<\/span>
    \n if<\/span> (<\/span>::<\/span>epoll_ctl<\/span>(<\/span>epfd_,<\/span> EPOLL_CTL_DEL,<\/span> c.<\/span>fd,<\/span> nullptr<\/span>)<\/span> <<\/span> 0<\/span>)<\/span>
    \n std::<\/span>cerr <<<\/span> "epoll_ctl DEL: "<\/span> <<<\/span> std::<\/span>strerror<\/span>(<\/span>errno)<\/span> <<<\/span> '\\\\n'<\/span>;<\/span>
    \n ::<\/span>close<\/span>(<\/span>c.<\/span>fd)<\/span>;<\/span> c.<\/span>fd =<\/span> –<\/span>1<\/span>;<\/span>
    \n connections_.<\/span>erase<\/span>(<\/span>c.<\/span>id)<\/span>;<\/span>
    \n }<\/span>
    \n void<\/span> refresh<\/span>(<\/span>Connection&<\/span> c)<\/span> {<\/span>
    \n if<\/span> (<\/span>c.<\/span>closed)<\/span> return<\/span>;<\/span>
    \n std::<\/span>uint32_t<\/span> events =<\/span> EPOLLET;<\/span>
    \n if<\/span> (<\/span>!<\/span>c.<\/span>eof)<\/span> events |=<\/span> EPOLLIN |<\/span> EPOLLRDHUP;<\/span>
    \n if<\/span> (<\/span>c.<\/span>sent <<\/span> c.<\/span>output.<\/span>size<\/span>(<\/span>)<\/span>)<\/span> events |=<\/span> EPOLLOUT;<\/span>
    \n if<\/span> (<\/span>events ==<\/span> c.<\/span>interests)<\/span> return<\/span>;<\/span>
    \n epoll_event event{<\/span>}<\/span>;<\/span>
    \n event.<\/span>events =<\/span> events;<\/span> event.<\/span>data.<\/span>u64 =<\/span> c.<\/span>id;<\/span>
    \n if<\/span> (<\/span>::<\/span>epoll_ctl<\/span>(<\/span>epfd_,<\/span> EPOLL_CTL_MOD,<\/span> c.<\/span>fd,<\/span> &<\/span>event)<\/span> <<\/span> 0<\/span>)<\/span> {<\/span>
    \n close_connection<\/span>(<\/span>c)<\/span>;<\/span> return<\/span>;<\/span>
    \n }<\/span>
    \n c.<\/span>interests =<\/span> events;<\/span>
    \n }<\/span>
    \n void<\/span> accept_all<\/span>(<\/span>Connection&<\/span> listener)<\/span> {<\/span>
    \n for<\/span> (<\/span>;<\/span>;<\/span>)<\/span> {<\/span>
    \n int<\/span> fd =<\/span> ::<\/span>accept4<\/span>(<\/span>listener.<\/span>fd,<\/span> nullptr<\/span>,<\/span> nullptr<\/span>,<\/span> SOCK_NONBLOCK |<\/span> SOCK_CLOEXEC)<\/span>;<\/span>
    \n if<\/span> (<\/span>fd >=<\/span> 0<\/span>)<\/span> {<\/span>
    \n auto<\/span> c =<\/span> hold_socket<\/span>(<\/span>fd)<\/span>;<\/span>
    \n if<\/span> (<\/span>connections_.<\/span>size<\/span>(<\/span>)<\/span> ><\/span> MAX_CLIENTS)<\/span> continue<\/span>;<\/span> \/\/ RAII closes fd.<\/span>
    \n c-><\/span>readable =<\/span> [<\/span>this<\/span>]<\/span>(<\/span>Connection&<\/span> x)<\/span> {<\/span> receive<\/span>(<\/span>x)<\/span>;<\/span> }<\/span>;<\/span>
    \n c-><\/span>writable =<\/span> [<\/span>this<\/span>]<\/span>(<\/span>Connection&<\/span> x)<\/span> {<\/span> flush<\/span>(<\/span>x)<\/span>;<\/span> }<\/span>;<\/span>
    \n add<\/span>(<\/span>c)<\/span>;<\/span>
    \n continue<\/span>;<\/span>
    \n }<\/span>
    \n if<\/span> (<\/span>errno ==<\/span> EINTR ||<\/span> errno ==<\/span> ECONNABORTED ||<\/span> errno ==<\/span> ENETDOWN ||<\/span>
    \n errno ==<\/span> EPROTO ||<\/span> errno ==<\/span> ENOPROTOOPT ||<\/span> errno ==<\/span> EHOSTDOWN ||<\/span>
    \n errno ==<\/span> ENONET ||<\/span> errno ==<\/span> EHOSTUNREACH ||<\/span> errno ==<\/span> EOPNOTSUPP ||<\/span>
    \n errno ==<\/span> ENETUNREACH)<\/span> continue<\/span>;<\/span>
    \n if<\/span> (<\/span>again<\/span>(<\/span>)<\/span>)<\/span> return<\/span>;<\/span>
    \n \/\/ Teaching policy: stop explicitly on resource exhaustion.<\/span>
    \n fail<\/span>(<\/span>"accept4"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n bool<\/span> queue_response<\/span>(<\/span>Connection&<\/span> c,<\/span> const<\/span> std::<\/span>string&<\/span> text)<\/span> {<\/span>
    \n if<\/span> (<\/span>c.<\/span>sent)<\/span> {<\/span> c.<\/span>output.<\/span>erase<\/span>(<\/span>0<\/span>,<\/span> c.<\/span>sent)<\/span>;<\/span> c.<\/span>sent =<\/span> 0<\/span>;<\/span> }<\/span>
    \n if<\/span> (<\/span>text.<\/span>size<\/span>(<\/span>)<\/span> ><\/span> MAX_OUTPUT –<\/span> c.<\/span>output.<\/span>size<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n close_connection<\/span>(<\/span>c)<\/span>;<\/span> return<\/span> false<\/span>;<\/span>
    \n }<\/span>
    \n c.<\/span>output +=<\/span> text;<\/span> return<\/span> true<\/span>;<\/span>
    \n }<\/span>
    \n bool<\/span> parse<\/span>(<\/span>Connection&<\/span> c)<\/span> {<\/span>
    \n for<\/span> (<\/span>;<\/span>;<\/span>)<\/span> {<\/span>
    \n auto<\/span> end =<\/span> c.<\/span>input.<\/span>find<\/span>(<\/span>'\\\\n'<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>end ==<\/span> std::<\/span>string::<\/span>npos)<\/span> {<\/span>
    \n if<\/span> (<\/span>c.<\/span>input.<\/span>size<\/span>(<\/span>)<\/span> ><\/span> MAX_LINE)<\/span> {<\/span> close_connection<\/span>(<\/span>c)<\/span>;<\/span> return<\/span> false<\/span>;<\/span> }<\/span>
    \n return<\/span> true<\/span>;<\/span>
    \n }<\/span>
    \n if<\/span> (<\/span>end ><\/span> MAX_LINE)<\/span> {<\/span> close_connection<\/span>(<\/span>c)<\/span>;<\/span> return<\/span> false<\/span>;<\/span> }<\/span>
    \n auto<\/span> response =<\/span> calculate<\/span>(<\/span>c.<\/span>input.<\/span>substr<\/span>(<\/span>0<\/span>,<\/span> end)<\/span>)<\/span>;<\/span>
    \n c.<\/span>input.<\/span>erase<\/span>(<\/span>0<\/span>,<\/span> end +<\/span> 1<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>!<\/span>queue_response<\/span>(<\/span>c,<\/span> response)<\/span>)<\/span> return<\/span> false<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n void<\/span> receive<\/span>(<\/span>Connection&<\/span> c)<\/span> {<\/span>
    \n char<\/span> buf[<\/span>4096<\/span>]<\/span>;<\/span>
    \n for<\/span> (<\/span>;<\/span>;<\/span>)<\/span> {<\/span>
    \n ssize_t n =<\/span> ::<\/span>recv<\/span>(<\/span>c.<\/span>fd,<\/span> buf,<\/span> sizeof<\/span>(<\/span>buf)<\/span>,<\/span> 0<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>n ><\/span> 0<\/span>)<\/span> {<\/span>
    \n c.<\/span>input.<\/span>append<\/span>(<\/span>buf,<\/span> static_cast<\/span><<\/span>std::<\/span>size_t><\/span><\/span><\/span>(<\/span>n)<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>!<\/span>parse<\/span>(<\/span>c)<\/span>)<\/span> return<\/span>;<\/span>
    \n flush<\/span>(<\/span>c)<\/span>;<\/span> \/\/ Keep a long readable burst from accumulating all replies.<\/span>
    \n if<\/span> (<\/span>c.<\/span>closed)<\/span> return<\/span>;<\/span>
    \n continue<\/span>;<\/span>
    \n }<\/span>
    \n if<\/span> (<\/span>n ==<\/span> 0<\/span>)<\/span> {<\/span>
    \n c.<\/span>eof =<\/span> true<\/span>;<\/span>
    \n if<\/span> (<\/span>!<\/span>c.<\/span>input.<\/span>empty<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n c.<\/span>input.<\/span>clear<\/span>(<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>!<\/span>queue_response<\/span>(<\/span>c,<\/span> "ERR truncated\\\\n"<\/span>)<\/span>)<\/span> return<\/span>;<\/span>
    \n }<\/span>
    \n break<\/span>;<\/span>
    \n }<\/span>
    \n if<\/span> (<\/span>errno ==<\/span> EINTR)<\/span> continue<\/span>;<\/span>
    \n if<\/span> (<\/span>again<\/span>(<\/span>)<\/span>)<\/span> break<\/span>;<\/span>
    \n close_connection<\/span>(<\/span>c)<\/span>;<\/span> return<\/span>;<\/span>
    \n }<\/span>
    \n flush<\/span>(<\/span>c)<\/span>;<\/span>
    \n }<\/span>
    \n void<\/span> flush<\/span>(<\/span>Connection&<\/span> c)<\/span> {<\/span>
    \n while<\/span> (<\/span>c.<\/span>sent <<\/span> c.<\/span>output.<\/span>size<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n ssize_t n =<\/span> ::<\/span>send<\/span>(<\/span>c.<\/span>fd,<\/span> c.<\/span>output.<\/span>data<\/span>(<\/span>)<\/span> +<\/span> c.<\/span>sent,<\/span>
    \n c.<\/span>output.<\/span>size<\/span>(<\/span>)<\/span> –<\/span> c.<\/span>sent,<\/span> MSG_NOSIGNAL)<\/span>;<\/span>
    \n if<\/span> (<\/span>n ><\/span> 0<\/span>)<\/span> {<\/span> c.<\/span>sent +=<\/span> static_cast<\/span><<\/span>std::<\/span>size_t><\/span><\/span><\/span>(<\/span>n)<\/span>;<\/span> continue<\/span>;<\/span> }<\/span>
    \n if<\/span> (<\/span>n <<\/span> 0<\/span> &&<\/span> errno ==<\/span> EINTR)<\/span> continue<\/span>;<\/span>
    \n if<\/span> (<\/span>n <<\/span> 0<\/span> &&<\/span> again<\/span>(<\/span>)<\/span>)<\/span> {<\/span> refresh<\/span>(<\/span>c)<\/span>;<\/span> return<\/span>;<\/span> }<\/span>
    \n close_connection<\/span>(<\/span>c)<\/span>;<\/span> return<\/span>;<\/span> \/\/ Includes unexpected zero progress.<\/span>
    \n }<\/span>
    \n c.<\/span>output.<\/span>clear<\/span>(<\/span>)<\/span>;<\/span> c.<\/span>sent =<\/span> 0<\/span>;<\/span>
    \n if<\/span> (<\/span>c.<\/span>eof)<\/span> {<\/span> close_connection<\/span>(<\/span>c)<\/span>;<\/span> return<\/span>;<\/span> }<\/span>
    \n refresh<\/span>(<\/span>c)<\/span>;<\/span> \/\/ Output empty: remove EPOLLOUT.<\/span>
    \n }<\/span>
    \n}<\/span>;<\/span>
    \n}<\/span> \/\/ namespace<\/span>
    \nint<\/span> main<\/span>(<\/span>int<\/span> argc,<\/span> char<\/span>*<\/span>*<\/span> argv)<\/span> {<\/span>
    \n try<\/span> {<\/span>
    \n unsigned<\/span> long<\/span> port =<\/span> 9090<\/span>;<\/span>
    \n if<\/span> (<\/span>argc ><\/span> 2<\/span>)<\/span> throw<\/span> std::<\/span>runtime_error<\/span>(<\/span>"usage: reactor_server [port]"<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>argc ==<\/span> 2<\/span>)<\/span> {<\/span>
    \n const<\/span> std::<\/span>string text =<\/span> argv[<\/span>1<\/span>]<\/span>;<\/span>
    \n if<\/span> (<\/span>text.<\/span>empty<\/span>(<\/span>)<\/span> ||<\/span> text.<\/span>find_first_not_of<\/span>(<\/span>"0123456789"<\/span>)<\/span> !=<\/span> std::<\/span>string::<\/span>npos)<\/span>
    \n throw<\/span> std::<\/span>runtime_error<\/span>(<\/span>"invalid port"<\/span>)<\/span>;<\/span>
    \n port =<\/span> std::<\/span>stoul<\/span>(<\/span>text)<\/span>;<\/span>
    \n if<\/span> (<\/span>port ==<\/span> 0<\/span> ||<\/span> port ><\/span> 65535<\/span>)<\/span> throw<\/span> std::<\/span>runtime_error<\/span>(<\/span>"invalid port"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n Reactor reactor<\/span>(<\/span>static_cast<\/span><<\/span>unsigned<\/span> short<\/span>><\/span><\/span><\/span>(<\/span>port)<\/span>)<\/span>;<\/span>
    \n std::<\/span>cout <<<\/span> "listening 127.0.0.1:"<\/span> <<<\/span> port <<<\/span> std::<\/span>endl;<\/span>
    \n reactor.<\/span>run<\/span>(<\/span>)<\/span>;<\/span>
    \n }<\/span> catch<\/span> (<\/span>const<\/span> std::<\/span>exception&<\/span> e)<\/span> {<\/span> std::<\/span>cerr <<<\/span> e.<\/span>what<\/span>(<\/span>)<\/span> <<<\/span> '\\\\n'<\/span>;<\/span> return<\/span> 1<\/span>;<\/span> }<\/span>
    \n}<\/span><\/p>\n

    \u8fd9\u4efd\u5b9e\u73b0\u6545\u610f\u6ca1\u6709\u628a\u6bcf\u4e2a\u5c0f\u51fd\u6570\u90fd\u62c6\u6210\u72ec\u7acb\u7c7b\u3002\u7406\u89e3\u804c\u8d23\u6bd4\u5148\u589e\u52a0\u6587\u4ef6\u6570\u91cf\u66f4\u91cd\u8981：\u4ee5\u540e\u5373\u4f7f\u628a Acceptor\u3001Connection\u3001\u534f\u8bae\u5904\u7406\u5668\u5206\u522b\u653e\u8fdb\u5934\u6587\u4ef6，\u5b83\u4eec\u4e4b\u95f4\u7684\u6240\u6709\u6743\u548c\u8c03\u7528\u5173\u7cfb\u4e5f\u5e94\u4fdd\u6301\u6e05\u6670\u3002<\/p>\n

    \u9605\u8bfb\u5b8c\u6574\u5b9e\u73b0\u65f6，\u53ef\u4ee5\u7ed9\u81ea\u5df1\u5212\u51fa\u4e09\u6761\u68c0\u67e5\u7ebf：<\/p>\n\n\u68c0\u67e5\u7ebf\u5bf9\u5e94\u51fd\u6570\u9700\u8981\u786e\u8ba4\u7684\u7ea6\u675f<\/tr>\n\n\n\n\n
    \u63a5\u5165\u4e0e\u8d44\u6e90<\/td>\nhold_socket \/ add \/ close_connection<\/td>\nfd \u521b\u5efa\u540e\u6709\u4eba\u6301\u6709，\u6ce8\u518c\u5931\u8d25\u80fd\u591f\u56de\u6536，\u5173\u95ed\u4e0d\u91cd\u590d<\/td>\n<\/tr>\n
    \u6570\u636e\u4e0e\u8fdb\u5ea6<\/td>\nreceive \/ parse \/ queue_response \/ flush<\/td>\n\u5b57\u8282\u6309\u957f\u5ea6\u8ffd\u52a0，\u5b8c\u6574\u8bf7\u6c42\u624d\u6d88\u8d39，\u53d1\u9001\u504f\u79fb\u4e0d\u8d8a\u754c<\/td>\n<\/tr>\n
    \u8c03\u5ea6\u4e0e\u8eab\u4efd<\/td>\nrun \/ refresh<\/td>\n\u4e8b\u4ef6\u6309 id \u67e5\u627e，\u5173\u95ed\u540e\u4e0d\u7ee7\u7eed\u5206\u6d3e，\u8ba2\u9605\u4e0e\u72b6\u6001\u4e00\u81f4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    hold_socket() \u8865\u4e0a\u4e86\u4e00\u4e2a\u8f83\u5c11\u51fa\u73b0\u4f46\u91cd\u8981\u7684\u7a97\u53e3：\u62ff\u5230 fd \u540e，\u521b\u5efa\u5171\u4eab\u5bf9\u8c61\u53ef\u80fd\u56e0\u4e3a\u5206\u914d\u5931\u8d25\u800c\u629b\u5f02\u5e38\u3002\u5bf9\u8c61\u5c1a\u672a\u5efa\u7acb\u65f6，\u5b83\u7684\u6790\u6784\u51fd\u6570\u4e5f\u4e0d\u4f1a\u66ff\u6211\u4eec\u5173\u95ed\u8d44\u6e90，\u56e0\u6b64\u9700\u8981\u5728\u8fd9\u4e2a\u8fb9\u754c\u663e\u5f0f\u56de\u6536\u3002\u8d44\u6e90\u7ba1\u7406\u4e0d\u80fd\u53ea\u8986\u76d6\u201c\u5bf9\u8c61\u5df2\u7ecf\u521b\u5efa\u6210\u529f\u201d\u7684\u5e38\u89c1\u8def\u5f84\u3002<\/p>\n<\/p>\n

    \u5341\u3001\u7f16\u8bd1\u8fd0\u884c\u4e0e\u8fb9\u754c\u5b9e\u9a8c<\/h3>\n

    \u5728 Linux \u4e2d\u8fdb\u5165\u4ee3\u7801\u76ee\u5f55：<\/p>\n

    g++ -std<\/span>=<\/span>c++17 -O2<\/span> -Wall<\/span> -Wextra<\/span> -Wpedantic<\/span> reactor_server.cpp -o<\/span> reactor_server
    \n.\/reactor_server 9090<\/span><\/p>\n

    \u6b63\u5e38\u542f\u52a8\u4f1a\u6253\u5370 listening 127.0.0.1:9090\u3002\u7aef\u53e3\u53c2\u6570\u53ea\u80fd\u662f 1～65535 \u7684\u5341\u8fdb\u5236\u6570\u5b57；\u7aef\u53e3\u5df2\u5360\u7528\u6216\u975e\u6cd5\u65f6，\u7a0b\u5e8f\u4f1a\u62a5\u544a\u9519\u8bef\u5e76\u9000\u51fa\u3002<\/p>\n

    \u53e6\u5f00\u7ec8\u7aef，\u7528 Python \u6807\u51c6\u5e93\u6784\u9020\u201c\u5206\u6b21\u53d1\u9001 + \u591a\u6761\u8bf7\u6c42 + \u534a\u5173\u95ed\u201d\u7684\u573a\u666f：<\/p>\n

    import<\/span> socket
    \nimport<\/span> time<\/p>\n

    with<\/span> socket.<\/span>create_connection(<\/span>(<\/span>"127.0.0.1"<\/span>,<\/span> 9090<\/span>)<\/span>)<\/span> as<\/span> s:<\/span>
    \n s.<\/span>settimeout(<\/span>3<\/span>)<\/span>
    \n s.<\/span>sendall(<\/span>b"12 +"<\/span>)<\/span>
    \n time.<\/span>sleep(<\/span>0.1<\/span>)<\/span>
    \n s.<\/span>sendall(<\/span>b" 30\\\\n9 \/ 0\\\\n7 * -8\\\\n"<\/span>)<\/span>
    \n s.<\/span>shutdown(<\/span>socket.<\/span>SHUT_WR)<\/span>
    \n chunks =<\/span> [<\/span>]<\/span>
    \n while<\/span> True<\/span>:<\/span>
    \n block =<\/span> s.<\/span>recv(<\/span>4096<\/span>)<\/span>
    \n if<\/span> not<\/span> block:<\/span>
    \n break<\/span>
    \n chunks.<\/span>append(<\/span>block)<\/span>
    \n print<\/span>(<\/span>b""<\/span>.<\/span>join(<\/span>chunks)<\/span>.<\/span>decode(<\/span>)<\/span>,<\/span> end=<\/span>""<\/span>)<\/span><\/p>\n

    \u9884\u671f\u5f97\u5230：<\/p>\n

    OK 42
    \nERR divide_by_zero
    \nOK -56<\/p>\n

    sleep() \u53ea\u5e2e\u52a9\u5236\u9020\u5206\u6b21\u5230\u8fbe\u7684\u673a\u4f1a，\u4e0d\u662f TCP \u62a5\u6587\u8fb9\u754c\u4fdd\u8bc1\u3002\u66f4\u4e25\u683c\u7684\u6d4b\u8bd5\u5e94\u5728\u53d1\u9001\u7b2c\u4e00\u6bb5\u540e\u786e\u8ba4\u6ca1\u6709\u5b8c\u6574\u54cd\u5e94，\u518d\u8865\u9f50\u7ec8\u6b62\u7b26\u3002<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u503c\u5f97\u7ee7\u7eed\u505a\u7684\u5b9e\u9a8c\u6709\u4ee5\u4e0b\u51e0\u7ec4：<\/p>\n\n\u8f93\u5165\u6216\u884c\u4e3a\u5e94\u89c2\u5bdf\u5230\u7684\u7ed3\u679c<\/tr>\n\n\n\n\n\n\n\n\n
    \u4e00\u6b21\u53d1\u9001\u5f88\u591a\u4e2a 1 + 2\\\\n<\/td>\n\u6bcf\u6761\u5bf9\u5e94\u4e00\u4e2a OK 3，\u987a\u5e8f\u4e00\u81f4<\/td>\n<\/tr>\n
    \u53d1\u9001 1 + 2\\\\n9 + \u540e\u534a\u5173\u95ed<\/td>\n\u5148 OK 3，\u518d ERR truncated<\/td>\n<\/tr>\n
    \u53d1\u9001 hello\\\\n1 + 2\\\\n<\/td>\n\u9519\u8bef\u884c\u540e\u8fd8\u80fd\u5904\u7406\u5408\u6cd5\u884c<\/td>\n<\/tr>\n
    \u957f\u65f6\u95f4\u4e0d\u53d1\u9001\u7684\u8fde\u63a5\u4e0e\u6d3b\u8dc3\u8fde\u63a5\u5e76\u5b58<\/td>\n\u6d3b\u8dc3\u8fde\u63a5\u4ecd\u7136\u5f97\u5230\u54cd\u5e94<\/td>\n<\/tr>\n
    \u7a81\u7136\u590d\u4f4d\u8fde\u63a5<\/td>\n\u670d\u52a1\u5668\u4fdd\u7559\u5904\u7406\u5176\u4ed6\u5ba2\u6237\u7aef\u7684\u80fd\u529b<\/td>\n<\/tr>\n
    \u6162\u5ba2\u6237\u7aef\u6301\u7eed\u79ef\u538b\u54cd\u5e94<\/td>\n\u8fbe\u5230\u8f93\u51fa\u4e0a\u9650\u540e\u88ab\u65ad\u5f00<\/td>\n<\/tr>\n
    \u77ed\u8fde\u63a5\u53cd\u590d\u5efa\u7acb\u4e0e\u91ca\u653e<\/td>\n\u65e7\u8fde\u63a5\u8eab\u4efd\u4e0d\u4f1a\u843d\u5230\u65b0\u8fde\u63a5\u4e0a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u4e00\u6b21\u666e\u901a\u56de\u73af\u5b9e\u9a8c\u901a\u5e38\u5f88\u96be\u7a33\u5b9a\u9047\u5230\u90e8\u5206\u53d1\u9001\u3002\u68c0\u67e5\u8fd9\u4e00\u5206\u652f\u65f6，\u53ef\u4ee5\u4f7f\u7528\u6d4b\u8bd5\u4e13\u7528\u7684\u7cfb\u7edf\u8c03\u7528\u5305\u88c5，\u5f3a\u5236\u77ed\u53d1\u9001\u548c EAGAIN，\u518d\u6838\u5bf9\u5b8c\u6574\u54cd\u5e94\u3002\u8fd9\u4e0e\u201c\u771f\u5b9e\u7f51\u7edc\u4e0b\u5076\u7136\u53d1\u751f\u8fc7\u201d\u662f\u4e0d\u540c\u7684\u8bc1\u636e，\u4e0d\u80fd\u6df7\u4e3a\u6027\u80fd\u6d4b\u8bd5\u3002<\/p>\n<\/p>\n

    \u5341\u4e00\u3001\u8d44\u6e90\u3001\u516c\u5e73\u6027\u4e0e\u5355 Reactor \u7684\u8fb9\u754c<\/h3>\n

    11.1 \u8bfb\u5230 EAGAIN，\u4e5f\u53ef\u80fd\u5360\u7528\u592a\u4e45<\/h4>\n

    \u201c\u8bfb\u5230\u6682\u65f6\u6ca1\u6709\u6570\u636e\u201d\u5f88\u9002\u5408\u8bb2\u6e05 ET \u7684\u63a8\u8fdb\u89c4\u5219，\u4f46\u5982\u679c\u67d0\u4e2a\u5ba2\u6237\u7aef\u6301\u7eed\u9ad8\u901f\u53d1\u9001，\u8bfb\u5faa\u73af\u53ef\u80fd\u957f\u65f6\u95f4\u4e0d\u7ed3\u675f，\u5176\u4ed6\u8fde\u63a5\u5c31\u4f1a\u5ef6\u8fdf\u3002<\/p>\n

    \u751f\u4ea7\u5b9e\u73b0\u5f80\u5f80\u8bbe\u7f6e\u6bcf\u8f6e\u5b57\u8282\u6570\u3001\u8bf7\u6c42\u6570\u6216\u65f6\u95f4\u9884\u7b97\u3002ET \u4e0b\u5982\u679c\u9884\u7b97\u8017\u5c3d\u65f6\u5c1a\u672a\u6392\u7a7a，\u5fc5\u987b\u628a\u8be5\u8fde\u63a5\u653e\u5230\u5e94\u7528\u5c42\u5c31\u7eea\u961f\u5217，\u5b89\u6392\u540e\u7eed\u4e3b\u52a8\u7ee7\u7eed\u5904\u7406；\u4e0d\u80fd\u76f4\u63a5\u91cd\u65b0\u7761\u8fdb epoll_wait()，\u7136\u540e\u5e0c\u671b\u4e00\u5b9a\u518d\u6765\u4e00\u4e2a\u8fb9\u6cbf\u3002<\/p>\n

    \u8fd9\u4e5f\u8bf4\u660e\u516c\u5e73\u6027\u662f\u8c03\u5ea6\u7b56\u7565，\u4e0d\u662f epoll \u81ea\u52a8\u63d0\u4f9b\u7684\u4fdd\u8bc1\u3002\u672c\u6587\u4f18\u5148\u5c55\u793a\u5b8c\u6574\u8bfb\u5199\u8def\u5f84，\u6ca1\u6709\u52a0\u5165\u8fd9\u4e2a\u4e8c\u7ea7\u8c03\u5ea6\u961f\u5217\u3002<\/p>\n

    11.2 \u5bf9\u8d44\u6e90\u4e0a\u9650\u7684\u7406\u89e3\u8981\u843d\u5230\u603b\u91cf<\/h4>\n

    \u5355\u8fde\u63a5\u8f93\u5165\u4e0a\u9650\u3001\u8f93\u51fa\u4e0a\u9650\u548c\u8fde\u63a5\u6570\u4e0a\u9650\u662f\u4e09\u4e2a\u4e0d\u540c\u7ea6\u675f\u3002\u793a\u4f8b\u9650\u5236\u6700\u591a 4096 \u4e2a\u5ba2\u6237\u7aef，\u8d85\u8fc7\u540e\u63a5\u5165\u5f97\u5230\u7684 fd \u4f1a\u968f\u5c40\u90e8 Connection \u91ca\u653e；\u8fd9\u4e0d\u662f\u670d\u52a1\u5668\u7684\u541e\u5410\u6307\u6807，\u4e5f\u4e0d\u662f\u7cfb\u7edf\u4e00\u5b9a\u80fd\u652f\u6301\u7684\u8fde\u63a5\u6570\u91cf\u3002<\/p>\n

    \u82e5\u6bcf\u4e2a\u8fde\u63a5\u90fd\u5141\u8bb8\u8f83\u5927\u7684\u7f13\u51b2，\u603b\u5185\u5b58\u53ef\u80fd\u8fdc\u8d85\u9884\u671f\u3002\u8fd8\u8981\u8003\u8651\u7a7a\u95f2\u8fde\u63a5\u8d85\u65f6\u3001\u5168\u5c40\u5185\u5b58\u6c34\u4f4d\u3001\u5355\u5ba2\u6237\u7aef\u8bf7\u6c42\u901f\u7387\u548c\u65e5\u5fd7\u5f00\u9500\u3002\u6309\u8fde\u63a5\u9650\u6d41\u4e0e\u5168\u5c40\u8fc7\u8f7d\u4fdd\u62a4\u5e94\u5171\u540c\u8bbe\u8ba1\u3002<\/p>\n

    11.3 \u5355 Reactor \u7684\u7b2c\u4e00\u6761\u6269\u5c55\u539f\u5219<\/h4>\n

    \u8981\u6269\u5c55\u7ebf\u7a0b\u4e4b\u524d，\u5148\u56de\u7b54：\u54ea\u4e9b\u51fd\u6570\u53ea\u80fd\u5728\u6240\u5c5e\u4e8b\u4ef6\u5faa\u73af\u4e2d\u6267\u884c？\u5982\u679c receive()\u3001flush()\u3001\u4fee\u6539\u8ba2\u9605\u548c\u5173\u95ed\u8fde\u63a5\u90fd\u80fd\u88ab\u4efb\u610f\u7ebf\u7a0b\u76f4\u63a5\u8c03\u7528，\u7ebf\u7a0b\u6570\u4e00\u589e\u52a0，\u8fde\u63a5\u72b6\u6001\u5c31\u5f88\u96be\u4fdd\u6301\u4e00\u81f4\u3002<\/p>\n

    \u4e0b\u4e00\u7bc7\u6cbf\u7528\u540c\u4e00\u4e2a\u7ea6\u675f：\u8fde\u63a5\u5f52\u4e00\u4e2a Loop \u7ba1\u7406，\u5176\u4ed6\u7ebf\u7a0b\u628a\u5de5\u4f5c\u6295\u9012\u7ed9\u5b83\u3002\u4e8b\u4ef6\u9a71\u52a8\u4ece\u7f51\u7edc fd \u5ef6\u4f38\u5230\u7ebf\u7a0b\u901a\u77e5 fd，Reactor \u7684\u7ed3\u6784\u65e0\u9700\u63a8\u5012\u91cd\u6765\u3002<\/p>\n<\/p>\n

    \u5341\u4e8c\u3001\u5e38\u89c1\u95ee\u9898\u4e0e\u81ea\u6d4b<\/h3>\n

    Q1：Reactor \u5fc5\u987b\u4f7f\u7528 ET \u5417？ \u4e0d\u5fc5\u987b\u3002LT \u548c ET \u90fd\u80fd\u652f\u6491 Reactor\u3002\u672c\u6587\u9009\u62e9 ET，\u662f\u4e3a\u4e86\u628a\u201c\u975e\u963b\u585e\u64cd\u4f5c\u63a8\u8fdb\u5230\u6682\u65f6\u4e0d\u80fd\u7ee7\u7eed\u201d\u7684\u89c4\u5219\u8bb2\u5b8c\u6574\u3002<\/p>\n

    Q2：\u52a0\u4e86\u56de\u8c03\u5c31\u662f Reactor \u5417？ \u56de\u8c03\u53ea\u662f\u7ec4\u7ec7\u624b\u6bb5\u3002\u8fd8\u9700\u8981\u7b49\u5f85\u5c31\u7eea\u3001\u6309\u4e8b\u4ef6\u5206\u6d3e，\u4ee5\u53ca\u8ba9\u5904\u7406\u8fc7\u7a0b\u80fd\u5728\u591a\u8f6e\u4e8b\u4ef6\u4e4b\u95f4\u4fdd\u5b58\u72b6\u6001\u3002<\/p>\n

    Q3：\u8bfb\u5230\u534a\u5305\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u7ee7\u7eed\u7b49\u5230\u5b8c\u6574？ \u5982\u679c\u8fd9\u91cc\u7684\u201c\u7b49\u201d\u662f\u963b\u585e\u5f53\u524d\u7ebf\u7a0b，\u5c31\u4f1a\u8ba9\u6240\u6709\u5176\u4ed6\u8fde\u63a5\u4e00\u8d77\u7b49\u5f85\u3002\u6b63\u786e\u505a\u6cd5\u662f\u4fdd\u7559\u534a\u5305，\u4ea4\u8fd8\u4e8b\u4ef6\u5faa\u73af\u3002<\/p>\n

    Q4：\u5e94\u7528\u8f93\u51fa\u7f13\u51b2\u4e3a\u7a7a，\u5c31\u80fd\u8bc1\u660e\u5bf9\u65b9\u6536\u5230\u54cd\u5e94\u5417？ \u4e0d\u80fd\u3002\u5b83\u53ea\u8bf4\u660e\u672c\u4f8b\u5df2\u7ecf\u628a\u5f85\u53d1\u9001\u5b57\u8282\u4ea4\u7ed9\u672c\u673a\u5185\u6838\u3002\u8981\u786e\u8ba4\u4e1a\u52a1\u63a5\u6536\u4e0e\u5904\u7406，\u9700\u8981\u5e94\u7528\u534f\u8bae\u7684\u786e\u8ba4\u673a\u5236\u3002<\/p>\n

    Q5：\u80fd\u5426\u4e00\u9047\u5230 EPOLLERR \u5c31\u5220\u9664\u5bf9\u8c61？ \u53ef\u4ee5\u9009\u62e9\u5173\u95ed\u8fde\u63a5，\u4f46\u5fc5\u987b\u8d70\u7edf\u4e00\u751f\u547d\u5468\u671f\u8def\u5f84，\u5e76\u786e\u4fdd\u672c\u8f6e\u540e\u7eed\u4ee3\u7801\u4e0d\u518d\u628a\u5b83\u5f53\u4f5c\u6d3b\u8dc3\u8fde\u63a5\u3002<\/p>\n

    \u6700\u540e\u8bd5\u7740\u72ec\u7acb\u89e3\u91ca\u4e09\u4e2a\u573a\u666f：\u8bfb\u56de\u8c03\u5173\u95ed\u540e\u4e3a\u4ec0\u4e48\u4ecd\u8981\u68c0\u67e5 closed；\u53d1\u9001\u4e00\u534a\u9047\u5230 EAGAIN \u65f6\u54ea\u4e9b\u72b6\u6001\u5fc5\u987b\u4fdd\u7559；\u5ba2\u6237\u7aef\u53ea\u5173\u95ed\u5199\u7aef\u540e\u670d\u52a1\u5668\u4e3a\u4ec0\u4e48\u8fd8\u80fd\u7ee7\u7eed\u53d1\u5e94\u7b54\u3002\u80fd\u987a\u7740\u72b6\u6001\u53d8\u5316\u56de\u7b54，\u624d\u7b97\u771f\u6b63\u628a\u4e8b\u4ef6\u5faa\u73af\u4e32\u4e86\u8d77\u6765\u3002<\/p>\n

    Reactor \u7684\u4e3b\u7ebf\u59cb\u7ec8\u5f88\u6e05\u695a：\u7b49\u5f85\u6761\u4ef6\u3001\u627e\u5230\u5bf9\u8c61\u3001\u63a8\u8fdb\u5904\u7406\u3001\u4fdd\u5b58\u72b6\u6001，\u518d\u628a\u6267\u884c\u6743\u4ea4\u56de\u4e8b\u4ef6\u5faa\u73af\u3002\u628a\u8fd9\u6761\u94fe\u8def\u5199\u7a33，\u591a Reactor \u7684\u6269\u5c55\u624d\u6709\u53ef\u9760\u7684\u57fa\u7840\u3002<\/p>\n

    \n

    📚 \u7cfb\u5217\u8854\u63a5：\u4e0b\u4e00\u7bc7\u300aReactor \u53cd\u5e94\u5806\u6a21\u5f0f（\u4e0b）：\u591a Reactor\u3001\u4efb\u52a1\u961f\u5217\u4e0e eventfd\u300b\u7ee7\u7eed\u8ba8\u8bba\u8fde\u63a5\u5f52\u5c5e\u548c\u8de8\u7ebf\u7a0b\u5524\u9192\u3002<\/p>\n

    💬 \u5982\u679c\u4f60\u5728\u5b9e\u73b0\u4e2d\u9047\u5230\u201c\u8fde\u63a5\u8fd8\u5728，\u4f46\u518d\u4e5f\u6ca1\u6709\u54cd\u5e94\u201d\u7684\u95ee\u9898，\u53ef\u4ee5\u5148\u6cbf\u7740\u8f93\u5165\u7f13\u51b2\u3001\u8f93\u51fa\u504f\u79fb\u3001\u8ba2\u9605\u4e8b\u4ef6\u548c\u5173\u95ed\u6807\u8bb0\u9010\u9879\u68c0\u67e5\u3002\u5f88\u591a\u770b\u4f3c\u795e\u79d8\u7684\u7f51\u7edc\u6545\u969c，\u6700\u7ec8\u90fd\u80fd\u843d\u5230\u67d0\u4e00\u6b21\u72b6\u6001\u8f6c\u6362\u4e0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

    \/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/#content_views .toc,\/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/#content_views.markdown_views > p:empty:has(+ .toc),#content_views.markdown_views > .toc + p:empty,\/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/#content<\/p>\n","protected":false},"author":2,"featured_media":123030,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11820,58,43,78],"topic":[],"class_list":["post-123038","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-atomgit","tag-linux","tag-43","tag-78"],"yoast_head":"\n\u3010Linux \u7f51\u7edc\u7f16\u7a0b\u3011Reactor \u53cd\u5e94\u5806\u6a21\u5f0f\uff08\u4e0a\uff09\uff1a\u628a epoll \u5199\u6210\u771f\u6b63\u7684\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/123038.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010Linux \u7f51\u7edc\u7f16\u7a0b\u3011Reactor \u53cd\u5e94\u5806\u6a21\u5f0f\uff08\u4e0a\uff09\uff1a\u628a epoll \u5199\u6210\u771f\u6b63\u7684\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/#content_views .toc,\/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/#content_views.markdown_views > p:empty:has(+ .toc),#content_views.markdown_views > .toc + p:empty,\/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/#content\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/123038.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-11-06T00:18:59+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/11\/20261106001847-6aed1ce71594a.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"14 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/123038.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/123038.html\",\"name\":\"\u3010Linux \u7f51\u7edc\u7f16\u7a0b\u3011Reactor \u53cd\u5e94\u5806\u6a21\u5f0f\uff08\u4e0a\uff09\uff1a\u628a epoll \u5199\u6210\u771f\u6b63\u7684\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-11-06T00:18:59+00:00\",\"dateModified\":\"2026-11-06T00:18:59+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/123038.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/123038.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/123038.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u3010Linux \u7f51\u7edc\u7f16\u7a0b\u3011Reactor \u53cd\u5e94\u5806\u6a21\u5f0f\uff08\u4e0a\uff09\uff1a\u628a epoll \u5199\u6210\u771f\u6b63\u7684\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"\u3010Linux \u7f51\u7edc\u7f16\u7a0b\u3011Reactor \u53cd\u5e94\u5806\u6a21\u5f0f\uff08\u4e0a\uff09\uff1a\u628a epoll \u5199\u6210\u771f\u6b63\u7684\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/123038.html","og_locale":"zh_CN","og_type":"article","og_title":"\u3010Linux \u7f51\u7edc\u7f16\u7a0b\u3011Reactor \u53cd\u5e94\u5806\u6a21\u5f0f\uff08\u4e0a\uff09\uff1a\u628a epoll \u5199\u6210\u771f\u6b63\u7684\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/#content_views .toc,\/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/#content_views.markdown_views > p:empty:has(+ .toc),#content_views.markdown_views > .toc + p:empty,\/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/#content","og_url":"https:\/\/www.wsisp.com\/helps\/123038.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-11-06T00:18:59+00:00","og_image":[{"url":"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/11\/20261106001847-6aed1ce71594a.png"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"14 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/123038.html","url":"https:\/\/www.wsisp.com\/helps\/123038.html","name":"\u3010Linux \u7f51\u7edc\u7f16\u7a0b\u3011Reactor \u53cd\u5e94\u5806\u6a21\u5f0f\uff08\u4e0a\uff09\uff1a\u628a epoll \u5199\u6210\u771f\u6b63\u7684\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2026-11-06T00:18:59+00:00","dateModified":"2026-11-06T00:18:59+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/123038.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/123038.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/123038.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"\u3010Linux \u7f51\u7edc\u7f16\u7a0b\u3011Reactor \u53cd\u5e94\u5806\u6a21\u5f0f\uff08\u4e0a\uff09\uff1a\u628a epoll \u5199\u6210\u771f\u6b63\u7684\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/123038","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=123038"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/123038\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media\/123030"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=123038"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=123038"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=123038"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=123038"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}