{"id":201413,"date":"2025-05-10T09:31:04","date_gmt":"2025-05-10T01:31:04","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201413\/"},"modified":"2025-05-10T09:31:04","modified_gmt":"2025-05-10T01:31:04","slug":"%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90%e5%8d%95%e7%ba%bf%e7%a8%8b%e7%9a%84-redis-%e5%a6%82%e4%bd%95%e5%81%9a%e5%88%b0%e6%af%8f%e7%a7%92%e6%95%b0%e4%b8%87-qps-%e7%9a%84%e8%b6%85%e9%ab%98%e5%a4%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201413\/","title":{"rendered":"\u6df1\u5ea6\u89e3\u6790\u5355\u7ebf\u7a0b\u7684 Redis \u5982\u4f55\u505a\u5230\u6bcf\u79d2\u6570\u4e07 QPS \u7684\u8d85\u9ad8\u5904\u7406\u80fd\u529b\uff01"},"content":{"rendered":"

<\/b> <\/p>\n

\u6df1\u5ea6\u89e3\u6790\u5355\u7ebf\u7a0b\u7684 Redis \u5982\u4f55\u505a\u5230\u6bcf\u79d2\u6570\u4e07 QPS \u7684\u8d85\u9ad8\u5904\u7406\u80fd\u529b\uff01<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u600e\u4e48\u5165\u95e8\u6570\u636e\u5e93\u7f16\u7a0b\uff1f\u9700\u8981\u5b66\u4e60\u54ea\u4e9b\u77e5\u8bc6\u70b9\uff1f\u8fd9\u662f\u65b0\u624b\u4eec\u521a\u63a5\u89e6\u7f16\u7a0b\u65f6\u5e38\u89c1\u7684\u95ee\u9898\uff1b\u4e0b\u9762golang\u5b66\u4e60\u7f51\u5c31\u6765\u7ed9\u5927\u5bb6\u6574\u7406\u5206\u4eab\u4e00\u4e9b\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u591f\u7ed9\u521d\u5b66\u8005\u4e00\u4e9b\u5e2e\u52a9\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u4ecb\u7ecd\u300a\u6df1\u5ea6\u89e3\u6790\u5355\u7ebf\u7a0b\u7684 Redis \u5982\u4f55\u505a\u5230\u6bcf\u79d2\u6570\u4e07 QPS \u7684\u8d85\u9ad8\u5904\u7406\u80fd\u529b\uff01\u300b\uff0c\u6d89\u53ca\u5230Redis\u3001QPS\u3001\u5355\u7ebf\u7a0b\uff0c\u6709\u9700\u8981\u7684\u53ef\u4ee5\u6536\u85cf\u4e00\u4e0b<\/p>\n

\u5927\u5bb6\u597d\uff0c\u6211\u662f\u98de\u54e5!<\/p>\n

\u4eca\u5929\u5f00\u7bc7\u5148\u7ed9\u5927\u5bb6\u8bb2\u4e2a\u98de\u54e5\u81ea\u5df1\u7684\u5c0f\u6545\u4e8b\u3002\u6211\u5728\u5b66\u6821\u548c\u521a\u6bd5\u4e1a\u5934\u4e00\u5e74\u4e3b\u8981\u4ece\u4e8b\u7684\u5ba2\u6237\u7aef\u5f00\u53d1\uff0c\u90a3\u65f6\u5019\u5bf9\u670d\u52a1\u5668\u7aef\u7f16\u7a0b\u8fd8\u4e0d\u64c5\u957f\u3002<\/p>\n

\u6709\u4e00\u6b21\u53bb\u9762\u8bd5\u670d\u52a1\u5668\u7aef\u5c97\u4f4d\uff0c\u9762\u8bd5\u5b98\u95ee\u6211\u6709\u4e00\u4e2a\u8fde\u63a5\u8fc7\u6765\uff0c\u4f60\u8be5\u600e\u4e48\u7f16\u7a0b\u5904\u7406\u5b83\u3002\u6211\u7b54\u9053\uff1a\u201c\u4e3b\u7ebf\u7a0b\u6536\u5230\u8bf7\u6c42\u540e\uff0c\u521b\u5efa\u4e00\u4e2a\u5b50\u7ebf\u7a0b\u5904\u7406\u3002\u201d \u9762\u8bd5\u5b98\u63a5\u7740\u95ee\uff0c\u90a3\u5982\u679c\u6709\u4e00\u5343\u4e2a\u8fde\u63a5\u540c\u65f6\u6765\u5462?\u6211\u8bf4\u201c\u90a3\u5c31\u591a\u521b\u5efa\u4e00\u70b9\u7ebf\u7a0b\uff0c\u641e\u4e2a\u7ebf\u7a0b\u6c60\u201d\u3002\u9762\u8bd5\u5b98\u7ee7\u7eed\u8ffd\u95ee\u5982\u679c\u4e00\u4e07\u4e2a\u5462?\u6211\u7b54\u9053:\u201c……\u4e0d\u4f1a…\u201d\u3002<\/p>\n

\u4e8b\u5b9e\u4e0a\uff0c\u670d\u52a1\u5668\u7aef\u53ea\u9700\u8981\u5355\u7ebf\u7a0b\u53ef\u4ee5\u8fbe\u5230\u975e\u5e38\u9ad8\u7684\u5904\u7406\u80fd\u529b\uff0cRedis \u5c31\u662f\u4e00\u4e2a\u975e\u5e38\u597d\u7684\u4f8b\u5b50\u3002\u4ec5\u4ec5\u9760\u5355\u7ebf\u7a0b\u5c31\u53ef\u4ee5\u652f\u6491\u8d77\u6bcf\u79d2\u6570\u4e07 QPS \u7684\u9ad8\u5904\u7406\u80fd\u529b\u3002\u4eca\u5929\u6211\u4eec\u5c31\u6765\u5e26\u5927\u5bb6\u770b\u770b Redis \u6838\u5fc3\u7f51\u7edc\u6a21\u5757\u7684\u5185\u90e8\u5b9e\u73b0\uff0c\u5b66\u4e60\u4e0b Redis \u662f\u5982\u4f55\u505a\u5230\u5982\u6b64\u7684\u9ad8\u6027\u80fd\u7684!<\/p>\n

\u4e00\u3001\u7406\u89e3\u591a\u8def\u590d\u7528\u539f\u7406<\/h3>\n

\u5728\u5f00\u59cb\u4ecb\u7ecd Redis \u4e4b\u524d\uff0c\u6211\u60f3\u6709\u5fc5\u8981\u5148\u6765\u7b80\u5355\u4ecb\u7ecd\u4e0b epoll\u3002<\/p>\n

\u5728\u4f20\u7edf\u7684\u540c\u6b65\u963b\u585e\u7f51\u7edc\u7f16\u7a0b\u6a21\u578b\u91cc(\u6ca1\u6709\u534f\u7a0b\u4ee5\u524d)\uff0c\u6027\u80fd\u4e0a\u4e0d\u6765\u7684\u6839\u672c\u539f\u56e0\u5728\u4e8e\u8fdb\u7a0b\u7ebf\u7a0b\u90fd\u662f\u7b28\u91cd\u7684\u5bb6\u4f19\u3002\u8ba9\u4e00\u4e2a\u8fdb(\u7ebf)\u7a0b\u53ea\u5904\u7406\u4e00\u4e2a\u7528\u6237\u8bf7\u6c42\u786e\u786e\u5b9e\u5b9e\u662f\u6709\u70b9\u6d6a\u8d39\u4e86\u3002<\/p>\n<\/p>\n

<\/p>\n

\u5148\u629b\u5f00\u9ad8\u5185\u5b58\u5f00\u9500\u4e0d\u8bf4\uff0c\u5728\u6d77\u91cf\u7684\u7f51\u7edc\u8bf7\u6c42\u5230\u6765\u7684\u65f6\u5019\uff0c\u5149\u662f\u9891\u7e41\u7684\u8fdb\u7a0b\u7ebf\u7a0b\u4e0a\u4e0b\u6587\u5c31\u8ba9 CPU \u75b2\u4e8e\u5954\u547d\u4e86\u3002<\/p>\n<\/p>\n

<\/p>\n

\u5982\u679c\u628a\u8fdb\u7a0b\u6bd4\u4f5c\u7267\u7f8a\u4eba\uff0c\u4e00\u4e2a\u8fdb(\u7ebf)\u7a0b\u540c\u65f6\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u7528\u6237\u8bf7\u6c42\uff0c\u76f8\u5f53\u4e8e\u4e00\u4e2a\u4eba\u53ea\u80fd\u770b\u4e00\u53ea\u7f8a\uff0c\u653e\u5b8c\u8fd9\u4e00\u53ea\u624d\u80fd\u653e\u4e0b\u4e00\u53ea\u3002\u5982\u679c\u540c\u65f6\u6765\u4e86 1000 \u53ea\u7f8a\uff0c\u90a3\u5c31\u5f97 1000 \u4e2a\u4eba\u53bb\u653e\uff0c\u8fd9\u4eba\u529b\u6210\u672c\u662f\u975e\u5e38\u9ad8\u7684\u3002<\/p>\n<\/p>\n

<\/p>\n

\u6027\u80fd\u63d0\u5347\u601d\u8def\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u8ba9\u5f88\u591a\u7684\u7528\u6237\u8fde\u63a5\u6765\u590d\u7528\u540c\u4e00\u4e2a\u8fdb(\u7ebf)\u7a0b\uff0c\u8fd9\u5c31\u662f\u591a\u8def\u590d\u7528\u3002\u591a\u8def\u6307\u7684\u662f\u8bb8\u8bb8\u591a\u591a\u4e2a\u7528\u6237\u7684\u7f51\u7edc\u8fde\u63a5\u3002\u590d\u7528\u6307\u7684\u662f\u5bf9\u8fdb(\u7ebf)\u7a0b\u7684\u590d\u7528\u3002\u6362\u5230\u7267\u7f8a\u4eba\u7684\u4f8b\u5b50\u91cc\uff0c\u5c31\u662f\u4e00\u7fa4\u7f8a\u53ea\u8981\u4e00\u4e2a\u7267\u7f8a\u4eba\u6765\u5904\u7406\u5c31\u884c\u4e86\u3002<\/p>\n

\u4e0d\u8fc7\u590d\u7528\u5b9e\u73b0\u8d77\u6765\u662f\u9700\u8981\u7279\u6b8a\u7684 socket \u4e8b\u4ef6\u7ba1\u7406\u673a\u5236\u7684\uff0c\u6700\u5178\u578b\u548c\u9ad8\u6548\u7684\u65b9\u6848\u5c31\u662f epoll\u3002\u653e\u5230\u7267\u7f8a\u4eba\u7684\u4f8b\u5b50\u6765\uff0cepoll \u5c31\u76f8\u5f53\u4e8e\u4e00\u53ea\u7267\u7f8a\u72ac\u3002<\/p>\n

\u5728 epoll \u7684\u7cfb\u5217\u51fd\u6570\u91cc\uff0c epoll_create \u7528\u4e8e\u521b\u5efa\u4e00\u4e2a epoll \u5bf9\u8c61\uff0cepoll_ctl \u7528\u6765\u7ed9 epoll \u5bf9\u8c61\u6dfb\u52a0\u6216\u8005\u5220\u9664\u4e00\u4e2a socket\u3002epoll_wait \u5c31\u662f\u67e5\u770b\u5b83\u5f53\u524d\u7ba1\u7406\u7684\u8fd9\u4e9b socket \u4e0a\u6709\u6ca1\u6709\u53ef\u8bfb\u53ef\u5199\u4e8b\u4ef6\u53d1\u751f\u3002<\/p>\n<\/p>\n

<\/p>\n

\u5f53\u7f51\u5361\u4e0a\u6536\u5230\u6570\u636e\u5305\u540e\uff0cLinux \u5185\u6838\u8fdb\u884c\u4e00\u7cfb\u5217\u7684\u5904\u7406\u540e\u628a\u6570\u636e\u653e\u5230 socket \u7684\u63a5\u6536\u961f\u5217\u3002\u7136\u540e\u4f1a\u68c0\u67e5\u662f\u5426\u6709 epoll \u5728\u7ba1\u7406\u5b83\uff0c\u5982\u679c\u662f\u5219\u5728 epoll \u7684\u5c31\u7eea\u961f\u5217\u4e2d\u63d2\u5165\u4e00\u4e2a\u5143\u7d20\u3002epoll_wait \u7684\u64cd\u4f5c\u5c31\u975e\u5e38\u7684\u7b80\u5355\u4e86\uff0c\u5c31\u662f\u5230 epoll \u7684\u5c31\u7eea\u961f\u5217\u4e0a\u6765\u67e5\u8be2\u6709\u6ca1\u6709\u4e8b\u4ef6\u53d1\u751f\u5c31\u884c\u4e86\u3002\u5173\u4e8e epoll \u8fd9\u53ea\u201c\u7267\u7f8a\u72ac\u201d\u7684\u5de5\u4f5c\u539f\u7406\u53c2\u89c1\u6df1\u5165\u63ed\u79d8 epoll \u662f\u5982\u4f55\u5b9e\u73b0 IO \u591a\u8def\u590d\u7528\u7684 (Javaer \u4e60\u60ef\u628a\u57fa\u4e8e epoll \u7684\u7f51\u7edc\u5f00\u53d1\u6a21\u578b\u53eb\u505a NIO)<\/p>\n

\u5728\u57fa\u4e8e epoll \u7684\u7f16\u7a0b\u4e2d\uff0c\u548c\u4f20\u7edf\u7684\u51fd\u6570\u8c03\u7528\u601d\u8def\u4e0d\u540c\u7684\u662f\uff0c\u6211\u4eec\u5e76\u4e0d\u80fd\u4e3b\u52a8\u8c03\u7528\u67d0\u4e2a API \u6765\u5904\u7406\u3002\u56e0\u4e3a\u65e0\u6cd5\u77e5\u9053\u6211\u4eec\u60f3\u8981\u5904\u7406\u7684\u4e8b\u4ef6\u5565\u65f6\u5019\u53d1\u751f\u3002\u6240\u4ee5\u53ea\u597d\u63d0\u524d\u628a\u60f3\u8981\u5904\u7406\u7684\u4e8b\u4ef6\u7684\u5904\u7406\u51fd\u6570\u6ce8\u518c\u5230\u4e00\u4e2a\u4e8b\u4ef6\u5206\u53d1\u5668\u4e0a\u53bb\u3002\u5f53\u4e8b\u4ef6\u53d1\u751f\u7684\u65f6\u5019\uff0c\u7531\u8fd9\u4e2a\u4e8b\u4ef6\u5206\u53d1\u5668\u8c03\u7528\u56de\u8c03\u51fd\u6570\u8fdb\u884c\u5904\u7406\u3002\u8fd9\u7c7b\u57fa\u4e8e\u5b9e\u73b0\u6ce8\u518c\u4e8b\u4ef6\u5206\u53d1\u5668\u7684\u5f00\u53d1\u6a21\u5f0f\u4e5f\u53eb Reactor \u6a21\u578b\u3002<\/p>\n

\u4e8c\u3001Redis \u670d\u52a1\u542f\u52a8\u521d\u59cb\u5316<\/h3>\n

\u7406\u89e3\u4e86 epoll \u539f\u7406\u540e\uff0c\u6211\u4eec\u518d\u6765\u5b9e\u9645\u770b Redis \u5177\u4f53\u662f\u5982\u4f55\u4f7f\u7528 epoll \u7684\u3002\u76f4\u63a5\u5728 Github \u4e0a\u5c31\u53ef\u4ee5\u975e\u5e38\u65b9\u4fbf\u5730\u83b7\u53d6 Redis \u7684\u6e90\u7801\u3002\u6211\u4eec\u5207\u5230 5.0.0 \u7248\u672c\u6765\u770b\u5355\u7ebf\u7a0b\u7248\u672c\u7684\u5b9e\u73b0(\u591a\u7ebf\u7a0b\u6211\u4eec\u6539\u5929\u518d\u8bb2)\u3002<\/p>\n

# git clone https:<\/span>\/\/<\/span>github.com<\/span>\/<\/span>redis\/<\/span>redis
# cd redis
# git checkout –<\/span>b 5.0<\/span>.0<\/span> 5.0<\/span>.0<\/span><\/p>\n

\u5176\u4e2d\u6574\u4e2a Redis \u670d\u52a1\u7684\u4ee3\u7801\u603b\u5165\u53e3\u5728 src\/server.c \u6587\u4ef6\u4e2d\uff0c\u6211\u628a\u5165\u53e3\u51fd\u6570\u7684\u6838\u5fc3\u90e8\u5206\u6458\u4e86\u51fa\u6765\uff0c\u5982\u4e0b\u3002<\/p>\n

\/\/<\/span>file:<\/span> src\/<\/span>server.c<\/span>
int<\/span> main(<\/span>int<\/span> argc,<\/span> char<\/span> **<\/span>argv)<\/span> {<\/span>
……
\/\/<\/span> \u542f\u52a8\u521d\u59cb\u5316
initServer(<\/span>)<\/span>;<\/span>
\/\/<\/span> \u8fd0\u884c\u4e8b\u4ef6\u5904\u7406\u5faa\u73af\uff0c\u4e00\u76f4\u5230\u670d\u52a1\u5668\u5173\u95ed\u4e3a\u6b62
aeMain(<\/span>server.el<\/span>)<\/span>;<\/span>
}<\/span><\/p>\n

\u5176\u5b9e\u6574\u4e2a Redis \u7684\u5de5\u4f5c\u8fc7\u7a0b\uff0c\u5c31\u53ea\u9700\u8981\u7406\u89e3\u6e05\u695a main \u51fd\u6570\u4e2d\u8c03\u7528\u7684 initServer \u548c aeMain \u8fd9\u4e24\u4e2a\u51fd\u6570\u5c31\u8db3\u591f\u4e86\u3002<\/p>\n

\u672c\u8282\u4e2d\u6211\u4eec\u91cd\u70b9\u4ecb\u7ecd initServer\uff0c\u5728\u4e0b\u4e00\u8282\u4ecb\u7ecd\u4e8b\u4ef6\u5904\u7406\u5faa\u73af aeMain\u3002\u5728 initServer \u8fd9\u4e2a\u51fd\u6570\u5185\uff0cRedis \u505a\u4e86\u8fd9\u4e48\u4e09\u4ef6\u91cd\u8981\u7684\u4e8b\u60c5\u3002<\/p>\n<\/p>\n

<\/p>\n

    \n
  • \u521b\u5efa\u4e00\u4e2a epoll \u5bf9\u8c61<\/li>\n
  • \u5bf9\u914d\u7f6e\u7684\u76d1\u542c\u7aef\u53e3\u8fdb\u884c listen<\/li>\n
  • \u628a listen socket \u8ba9 epoll \u7ed9\u7ba1\u7406\u8d77\u6765<\/li>\n<\/ul>\n

    \/\/<\/span>file:<\/span> src\/<\/span>server.c<\/span>
    void initServer(<\/span>)<\/span> {<\/span>
    \/\/<\/span> 2.1<\/span>.1<\/span> \u521b\u5efa epoll
    server.el<\/span> =<\/span> aeCreateEventLoop(<\/span>server.maxclients<\/span>+<\/span>CONFIG_FDSET_INCR)<\/span>;<\/span><\/p>\n

    \/\/<\/span> 2.1<\/span>.2<\/span> \u7ed1\u5b9a\u76d1\u542c\u670d\u52a1\u7aef\u53e3
    listenToPort(<\/span>server.port<\/span>,<\/span>server.ipfd<\/span>,<\/span>&<\/span>server.ipfd_count<\/span>)<\/span>;<\/span><\/p>\n

    \/\/<\/span> 2.1<\/span>.3<\/span> \u6ce8\u518c accept \u4e8b\u4ef6\u5904\u7406\u5668
    for (<\/span>j =<\/span> 0<\/span>;<\/span> j server.ipfd_count<\/span>;<\/span> j++<\/span>)<\/span> {<\/span>
    aeCreateFileEvent(<\/span>server.el<\/span>,<\/span> server.ipfd<\/span>[<\/span>j]<\/span>,<\/span> AE_READABLE,<\/span>
    acceptTcpHandler,<\/span>NULL<\/span>)<\/span>;<\/span>
    }<\/span>
    …
    }<\/span><\/span><\/p>\n

    \u63a5\u4e0b\u6765\u6211\u4eec\u5206\u522b\u6765\u770b\u3002<\/p>\n

    2.1 \u521b\u5efa epoll \u5bf9\u8c61<\/h4>\n

    \u672c\u5c0f\u8282\u7684\u903b\u8f91\u770b\u8d77\u6765\u8c8c\u4f3c\u4e0d\u77ed\uff0c\u4f46\u5176\u5b9e\u53ea\u662f\u521b\u5efa\u4e86\u4e00\u4e2a epoll \u5bf9\u8c61\u51fa\u6765\u800c\u5df2\u3002<\/p>\n

    \u521b\u5efa epoll \u5bf9\u8c61\u7684\u903b\u8f91\u5728 aeCreateEventLoop \u4e2d\uff0c\u5728\u521b\u5efa\u5b8c\u540e\uff0cRedis \u5c06\u5176\u4fdd\u5b58\u5728 redisServer \u7684 aeEventLoop \u6210\u5458\u4e2d\uff0c\u4ee5\u5907\u540e\u7eed\u4f7f\u7528\u3002<\/p>\n

    struct redisServer {<\/span>
    …
    aeEventLoop *<\/span>el;<\/span>
    }<\/span><\/p>\n

    \u6211\u4eec\u6765\u770b aeCreateEventLoop \u8be6\u7ec6\u903b\u8f91\u3002Redis \u5728\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u7684 epoll \u5bf9\u8c61\u57fa\u7840\u4e0a\u53c8\u5c01\u88c5\u4e86\u4e00\u4e2a eventLoop \u51fa\u6765\uff0c\u6240\u4ee5\u521b\u5efa\u7684\u65f6\u5019\u662f\u5148\u7533\u8bf7\u548c\u521b\u5efa eventLoop\u3002<\/p>\n

    \/\/<\/span>file:<\/span>src\/<\/span>ae.c<\/span>
    aeEventLoop *<\/span>aeCreateEventLoop(<\/span>int<\/span> setsize)<\/span> {<\/span>
    aeEventLoop *<\/span>eventLoop;<\/span>
    eventLoop =<\/span> zmalloc(<\/span>sizeof(<\/span>*<\/span>eventLoop)<\/span>;<\/span><\/p>\n

    \/\/<\/span>\u5c06\u6765\u7684\u5404\u79cd\u56de\u8c03\u4e8b\u4ef6\u5c31\u90fd\u4f1a\u5b58\u5728\u8fd9\u91cc
    eventLoop-><\/span>events =<\/span> zmalloc(<\/span>sizeof(<\/span>aeFileEvent)<\/span>*<\/span>setsize)<\/span>;<\/span>
    ……<\/p>\n

    aeApiCreate(<\/span>eventLoop)<\/span>;<\/span>
    return eventLoop;<\/span>
    }<\/span><\/p>\n

    \u5728 eventLoop \u91cc\uff0c\u6211\u4eec\u7a0d\u5fae\u6ce8\u610f\u4e00\u4e0b eventLoop->events\uff0c\u5c06\u6765\u5728\u5404\u79cd\u4e8b\u4ef6\u6ce8\u518c\u7684\u65f6\u5019\u90fd\u4f1a\u4fdd\u5b58\u5230\u8fd9\u4e2a\u6570\u7ec4\u91cc\u3002<\/p>\n

    \/\/<\/span>file:<\/span>src\/<\/span>ae.h<\/span>
    typedef struct aeEventLoop {<\/span>
    ……
    aeFileEvent *<\/span>events;<\/span> \/* Registered events *\/<\/span>
    }<\/span><\/p>\n

    \u5177\u4f53\u521b\u5efa epoll \u7684\u8fc7\u7a0b\u5728 ae_epoll.c \u6587\u4ef6\u4e0b\u7684 aeApiCreate \u4e2d\u3002\u5728\u8fd9\u91cc\uff0c\u771f\u6b63\u8c03\u7528\u4e86 epoll_create<\/p>\n

    \/\/<\/span>file:<\/span>src\/<\/span>ae_epoll.c<\/span>
    static int<\/span> aeApiCreate(<\/span>aeEventLoop *<\/span>eventLoop)<\/span> {<\/span>
    aeApiState *<\/span>state =<\/span> zmalloc(<\/span>sizeof(<\/span>aeApiState)<\/span>)<\/span>;<\/span>
    state-><\/span>epfd =<\/span> epoll_create(<\/span>1024<\/span>)<\/span>;<\/span>
    eventLoop-><\/span>apidata =<\/span> state;<\/span>
    return 0<\/span>;<\/span>
    }<\/span><\/p>\n

    2.2 \u7ed1\u5b9a\u76d1\u542c\u670d\u52a1\u7aef\u53e3<\/h4>\n

    \u6211\u4eec\u518d\u6765\u770b Redis \u4e2d\u7684 listen \u8fc7\u7a0b\uff0c\u5b83\u5728 listenToPort \u51fd\u6570\u4e2d\u3002\u867d\u7136\u8c03\u7528\u94fe\u6761\u5f88\u957f\uff0c\u4f46\u5176\u5b9e\u4e3b\u8981\u5c31\u662f\u6267\u884c\u4e86\u4e2a\u7b80\u5355 listen \u800c\u5df2\u3002<\/p>\n

    \/\/<\/span>file:<\/span> src\/<\/span>redis.c<\/span>
    int<\/span> listenToPort(<\/span>int<\/span> port,<\/span> int<\/span> *<\/span>fds,<\/span> int<\/span> *<\/span>count<\/span>)<\/span> {<\/span>
    for (<\/span>j =<\/span> 0<\/span>;<\/span> j server.bindaddr_count<\/span> ||<\/span> j ==<\/span> 0<\/span>;<\/span> j++<\/span>)<\/span> {<\/span>
    fds[<\/span>*<\/span>count<\/span>]<\/span> =<\/span> anetTcpServer(<\/span>server.neterr<\/span>,<\/span>port,<\/span>NULL<\/span>,<\/span>
    server.tcp_backlog<\/span>)<\/span>;<\/span>
    }<\/span>
    }<\/span><\/span><\/p>\n

    Redis \u662f\u652f\u6301\u5f00\u542f\u591a\u4e2a\u7aef\u53e3\u7684\uff0c\u6240\u4ee5\u5728 listenToPort \u4e2d\u6211\u4eec\u770b\u5230\u662f\u542f\u7528\u4e00\u4e2a\u5faa\u73af\u6765\u8c03\u7528 anetTcpServer\u3002\u5728 anetTcpServer \u4e2d\uff0c\u9010\u6b65\u4f1a\u5c55\u5f00\u8c03\u7528\uff0c\u76f4\u5230\u6267\u884c\u5230 bind \u548c listen \u7cfb\u7edf\u8c03\u7528\u3002<\/p>\n

    \/\/<\/span>file:<\/span>src\/<\/span>anet.c<\/span>
    int<\/span> anetTcpServer(<\/span>char<\/span> *<\/span>err,<\/span> int<\/span> port,<\/span> char<\/span> *<\/span>bindaddr,<\/span> int<\/span> backlog)<\/span>
    {<\/span>
    return _anetTcpServer(<\/span>err,<\/span> port,<\/span> bindaddr,<\/span> AF_INET,<\/span> backlog)<\/span>;<\/span>
    }<\/span>
    static int<\/span> _anetTcpServer(<\/span>……)<\/span>
    {<\/span>
    \/\/<\/span> \u8bbe\u7f6e\u7aef\u53e3\u91cd\u7528
    anetSetReuseAddr(<\/span>err,<\/span>s)<\/span>
    \/\/<\/span> \u76d1\u542c
    anetListen(<\/span>err,<\/span>s,<\/span>p-><\/span>ai_addr,<\/span>p-><\/span>ai_addrlen,<\/span>backlog)<\/span>
    }<\/span>
    static int<\/span> anetListen(<\/span>……)<\/span> {<\/span>
    bind(<\/span>s,<\/span>sa,<\/span>len)<\/span>;<\/span>
    listen(<\/span>s,<\/span> backlog)<\/span>;<\/span>
    ……
    }<\/span><\/p>\n

    2.3 \u6ce8\u518c\u4e8b\u4ef6\u56de\u8c03\u51fd\u6570<\/h4>\n

    \u6211\u4eec\u56de\u5934\u518d\u770b\u4e00\u4e0b initServer\uff0c\u5b83\u8c03\u7528 aeCreateEventLoop \u521b\u5efa\u4e86 epoll\uff0c\u8c03\u7528 listenToPort \u8fdb\u884c\u4e86\u670d\u52a1\u7aef\u53e3\u7684 bind \u548c listen\u3002\u63a5\u7740\u5c31\u5f00\u59cb\u8c03\u7528 aeCreateFileEvent \u6765\u6ce8\u518c\u4e00\u4e2a accept \u4e8b\u4ef6\u5904\u7406\u5668\u3002<\/p>\n

    \/\/<\/span>file:<\/span> src\/<\/span>server.c<\/span>
    void initServer(<\/span>)<\/span> {<\/span>
    \/\/<\/span> 2.1<\/span>.1<\/span> \u521b\u5efa epoll
    server.el<\/span> =<\/span> aeCreateEventLoop(<\/span>server.maxclients<\/span>+<\/span>CONFIG_FDSET_INCR)<\/span>;<\/span><\/p>\n

    \/\/<\/span> 2.1<\/span>.2<\/span> \u76d1\u542c\u670d\u52a1\u7aef\u53e3
    listenToPort(<\/span>server.port<\/span>,<\/span>server.ipfd<\/span>,<\/span>&<\/span>server.ipfd_count<\/span>)<\/span>;<\/span><\/p>\n

    \/\/<\/span> 2.1<\/span>.3<\/span> \u6ce8\u518c accept \u4e8b\u4ef6\u5904\u7406\u5668
    for (<\/span>j =<\/span> 0<\/span>;<\/span> j server.ipfd_count<\/span>;<\/span> j++<\/span>)<\/span> {<\/span>
    aeCreateFileEvent(<\/span>server.el<\/span>,<\/span> server.ipfd<\/span>[<\/span>j]<\/span>,<\/span> AE_READABLE,<\/span>
    acceptTcpHandler,<\/span>NULL<\/span>)<\/span>;<\/span>
    }<\/span>
    …
    }<\/span><\/span><\/p>\n

    \u6211\u4eec\u6765\u6ce8\u610f\u770b\u8c03\u7528 aeCreateFileEvent \u65f6\u4f20\u7684\u91cd\u8981\u53c2\u6570\u662f acceptTcpHandler\uff0c\u5b83\u8868\u793a\u5c06\u6765\u5728 listen socket \u4e0a\u6709\u65b0\u7528\u6237\u8fde\u63a5\u5230\u8fbe\u7684\u65f6\u5019\uff0c\u8be5\u51fd\u6570\u5c06\u88ab\u8c03\u7528\u6267\u884c\u3002\u6211\u4eec\u6765\u770b aeCreateFileEvent \u5177\u4f53\u4ee3\u7801\u3002<\/p>\n

    \/\/<\/span>file:<\/span> src\/<\/span>ae.c<\/span>
    int<\/span> aeCreateFileEvent(<\/span>aeEventLoop *<\/span>eventLoop,<\/span> int<\/span> fd,<\/span> int<\/span> mask,<\/span>
    aeFileProc *<\/span>proc,<\/span> void *<\/span>clientData)<\/span>
    {<\/span>
    \/\/<\/span> \u53d6\u51fa\u4e00\u4e2a\u6587\u4ef6\u4e8b\u4ef6\u7ed3\u6784
    aeFileEvent *<\/span>fe =<\/span> &<\/span>eventLoop-><\/span>events[<\/span>fd]<\/span>;<\/span><\/p>\n

    \/\/<\/span> \u76d1\u542c\u6307\u5b9a fd \u7684\u6307\u5b9a\u4e8b\u4ef6
    aeApiAddEvent(<\/span>eventLoop,<\/span> fd,<\/span> mask)<\/span>;<\/span><\/p>\n

    \/\/<\/span> \u8bbe\u7f6e\u6587\u4ef6\u4e8b\u4ef6\u7c7b\u578b\uff0c\u4ee5\u53ca\u4e8b\u4ef6\u7684\u5904\u7406\u5668
    fe-><\/span>mask |=<\/span> mask;<\/span>
    if (<\/span>mask &<\/span> AE_READABLE)<\/span> fe-><\/span>rfileProc =<\/span> proc;<\/span>
    if (<\/span>mask &<\/span> AE_WRITABLE)<\/span> fe-><\/span>wfileProc =<\/span> proc;<\/span><\/p>\n

    \/\/<\/span> \u79c1\u6709\u6570\u636e
    fe-><\/span>clientData =<\/span> clientData;<\/span>
    }<\/span><\/p>\n

    \u51fd\u6570 aeCreateFileEvent \u4e00\u5f00\u59cb\uff0c\u4ece eventLoop->events \u83b7\u53d6\u4e86\u4e00\u4e2a aeFileEvent \u5bf9\u8c61\u3002\u5728 2.1 \u4e2d\u6211\u4eec\u4ecb\u7ecd\u8fc7 eventLoop->events \u6570\u7ec4\uff0c\u6ce8\u518c\u7684\u5404\u79cd\u4e8b\u4ef6\u5904\u7406\u5668\u4f1a\u4fdd\u5b58\u5728\u8fd9\u4e2a\u5730\u65b9\u3002<\/p>\n

    \u63a5\u4e0b\u6765\u8c03\u7528 aeApiAddEvent\u3002\u8fd9\u4e2a\u51fd\u6570\u5176\u5b9e\u5c31\u662f\u5bf9 epoll_ctl \u7684\u4e00\u4e2a\u5c01\u88c5\u3002\u4e3b\u8981\u5c31\u662f\u5b9e\u9645\u6267\u884c epoll_ctl EPOLL_CTL_ADD\u3002<\/p>\n

    \/\/<\/span>file:<\/span>src\/<\/span>ae_epoll.c<\/span>
    static int<\/span> aeApiAddEvent(<\/span>aeEventLoop *<\/span>eventLoop,<\/span> int<\/span> fd,<\/span> int<\/span> mask)<\/span> {<\/span>
    \/\/<\/span> add or<\/span> mod
    int<\/span> op =<\/span> eventLoop-><\/span>events[<\/span>fd]<\/span>.mask<\/span> ==<\/span> AE_NONE ?<\/span>
    EPOLL_CTL_ADD :<\/span> EPOLL_CTL_MOD;<\/span>
    ……<\/p>\n

    \/\/<\/span> epoll_ctl \u6dfb\u52a0\u4e8b\u4ef6
    epoll_ctl(<\/span>state-><\/span>epfd,<\/span>op,<\/span>fd,<\/span>&<\/span>ee)<\/span>;<\/span>
    return 0<\/span>;<\/span>
    }<\/span><\/p>\n

    \u6bcf\u4e00\u4e2a eventLoop->events \u5143\u7d20\u90fd\u6307\u5411\u4e00\u4e2a aeFileEvent \u5bf9\u8c61\u3002\u5728\u8fd9\u4e2a\u5bf9\u8c61\u4e0a\uff0c\u8bbe\u7f6e\u4e86\u4e09\u4e2a\u5173\u952e\u4e1c\u897f<\/p>\n

      \n
    • rfileProc\uff1a\u8bfb\u4e8b\u4ef6\u56de\u8c03<\/li>\n
    • wfileProc\uff1a\u5199\u4e8b\u4ef6\u56de\u8c03<\/li>\n
    • clientData\uff1a\u4e00\u4e9b\u989d\u5916\u7684\u6269\u5c55\u6570\u636e<\/li>\n<\/ul>\n

      \u5c06\u6765 \u5f53 epoll_wait \u53d1\u73b0\u67d0\u4e2a fd \u4e0a\u6709\u4e8b\u4ef6\u53d1\u751f\u7684\u65f6\u5019\uff0c\u8fd9\u6837 redis \u9996\u5148\u6839\u636e fd \u5230 eventLoop->events \u4e2d\u67e5\u627e aeFileEvent \u5bf9\u8c61\uff0c\u7136\u540e\u518d\u770b rfileProc\u3001wfileProc \u5c31\u53ef\u4ee5\u627e\u5230\u8bfb\u3001\u5199\u56de\u8c03\u5904\u7406\u51fd\u6570\u3002<\/p>\n

      \u56de\u5934\u770b initServer \u8c03\u7528 aeCreateFileEvent \u65f6\u4f20\u53c2\u6765\u770b\u3002<\/p>\n

      \/\/<\/span>file:<\/span> src\/<\/span>server.c<\/span>
      void initServer(<\/span>)<\/span> {<\/span>
      ……
      \/\/<\/span> 2.1<\/span>.3<\/span> \u6ce8\u518c accept \u4e8b\u4ef6\u5904\u7406\u5668
      for (<\/span>j =<\/span> 0<\/span>;<\/span> j server.ipfd_count<\/span>;<\/span> j++<\/span>)<\/span> {<\/span>
      aeCreateFileEvent(<\/span>server.el<\/span>,<\/span> server.ipfd<\/span>[<\/span>j]<\/span>,<\/span> AE_READABLE,<\/span>
      acceptTcpHandler,<\/span>NULL<\/span>)<\/span>;<\/span>
      }<\/span>
      }<\/span><\/span><\/p>\n

      listen fd \u5bf9\u5e94\u7684\u8bfb\u56de\u8c03\u51fd\u6570 rfileProc \u4e8b\u5b9e\u4e0a\u5c31\u88ab\u8bbe\u7f6e\u6210\u4e86 acceptTcpHandler\uff0c\u5199\u56de\u8c03\u6ca1\u6709\u8bbe\u7f6e\uff0c\u79c1\u6709\u6570\u636e client_data \u4e5f\u4e3a null\u3002<\/p>\n

      \u4e09\u3001Redis \u4e8b\u4ef6\u5904\u7406\u5faa\u73af<\/h3>\n

      \u5728\u4e0a\u4e00\u8282\u4ecb\u7ecd\u5b8c\u4e86 Redis \u7684\u542f\u52a8\u521d\u59cb\u5316\u8fc7\u7a0b\uff0c\u521b\u5efa\u4e86 epoll\uff0c\u4e5f\u8fdb\u884c\u4e86\u7ed1\u5b9a\u76d1\u542c\uff0c\u4e5f\u6ce8\u518c\u4e86 accept \u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e3a acceptTcpHandler\u3002<\/p>\n

      \/\/<\/span>file:<\/span> src\/<\/span>server.c<\/span>
      int<\/span> main(<\/span>int<\/span> argc,<\/span> char<\/span> **<\/span>argv)<\/span> {<\/span>
      ……
      \/\/<\/span> \u542f\u52a8\u521d\u59cb\u5316
      initServer(<\/span>)<\/span>;<\/span>
      \/\/<\/span> \u8fd0\u884c\u4e8b\u4ef6\u5904\u7406\u5faa\u73af\uff0c\u4e00\u76f4\u5230\u670d\u52a1\u5668\u5173\u95ed\u4e3a\u6b62
      aeMain(<\/span>server.el<\/span>)<\/span>;<\/span>
      }<\/span><\/p>\n

      \u63a5\u4e0b\u6765\uff0cRedis \u5c31\u4f1a\u8fdb\u5165 aeMain \u5f00\u59cb\u8fdb\u884c\u771f\u6b63\u7684\u7528\u6237\u8bf7\u6c42\u5904\u7406\u4e86\u3002\u5728 aeMain \u51fd\u6570\u4e2d\uff0c\u662f\u4e00\u4e2a\u65e0\u4f11\u6b62\u7684\u5faa\u73af\u3002\u5728\u6bcf\u4e00\u6b21\u7684\u5faa\u73af\u4e2d\uff0c\u8981\u505a\u5982\u4e0b\u51e0\u4ef6\u4e8b\u60c5\u3002<\/p>\n<\/p>\n

      <\/p>\n

        \n
      • \u901a\u8fc7 epoll_wait \u53d1\u73b0 listen socket \u4ee5\u53ca\u5176\u5b83\u8fde\u63a5\u4e0a\u7684\u53ef\u8bfb\u3001\u53ef\u5199\u4e8b\u4ef6<\/li>\n
      • \u82e5\u53d1\u73b0 listen socket \u4e0a\u6709\u65b0\u8fde\u63a5\u5230\u8fbe\uff0c\u5219\u63a5\u6536\u65b0\u8fde\u63a5\uff0c\u5e76\u8ffd\u52a0\u5230 epoll \u4e2d\u8fdb\u884c\u7ba1\u7406<\/li>\n
      • \u82e5\u53d1\u73b0\u5176\u5b83 socket \u4e0a\u6709\u547d\u4ee4\u8bf7\u6c42\u5230\u8fbe\uff0c\u5219\u8bfb\u53d6\u548c\u5904\u7406\u547d\u4ee4\uff0c\u628a\u547d\u4ee4\u7ed3\u679c\u5199\u5230\u7f13\u5b58\u4e2d\uff0c\u52a0\u5165\u5199\u4efb\u52a1\u961f\u5217<\/li>\n
      • \u6bcf\u4e00\u6b21\u8fdb\u5165 epoll_wait \u524d\u90fd\u8c03\u7528 beforesleep \u6765\u5c06\u5199\u4efb\u52a1\u961f\u5217\u4e2d\u7684\u6570\u636e\u5b9e\u9645\u8fdb\u884c\u53d1\u9001<\/li>\n
      • \u5982\u82e5\u6709\u9996\u6b21\u672a\u53d1\u9001\u5b8c\u6bd5\u7684\uff0c\u5f53\u5199\u4e8b\u4ef6\u53d1\u751f\u65f6\u7ee7\u7eed\u53d1\u9001<\/li>\n<\/ul>\n

        \/\/<\/span>file:<\/span>src\/<\/span>ae.c<\/span>
        void aeMain(<\/span>aeEventLoop *<\/span>eventLoop)<\/span> {<\/span><\/p>\n

        eventLoop-><\/span>stop =<\/span> 0<\/span>;<\/span>
        while (<\/span>!<\/span>eventLoop-><\/span>stop)<\/span> {<\/span><\/p>\n

        \/\/<\/span> \u5982\u679c\u6709\u9700\u8981\u5728\u4e8b\u4ef6\u5904\u7406\u524d\u6267\u884c\u7684\u51fd\u6570\uff0c\u90a3\u4e48\u8fd0\u884c\u5b83
        \/\/<\/span> 3.4<\/span> beforesleep \u5904\u7406\u5199\u4efb\u52a1\u961f\u5217\u5e76\u5b9e\u9645\u53d1\u9001\u4e4b
        if (<\/span>eventLoop-><\/span>beforesleep !=<\/span> NULL<\/span>)<\/span>
        eventLoop-><\/span>beforesleep(<\/span>eventLoop)<\/span>;<\/span><\/p>\n

        \/\/<\/span> \u5f00\u59cb\u7b49\u5f85\u4e8b\u4ef6\u5e76\u5904\u7406
        \/\/<\/span> 3.1<\/span> epoll_wait \u53d1\u73b0\u4e8b\u4ef6
        \/\/<\/span> 3.2<\/span> \u5904\u7406\u65b0\u8fde\u63a5\u8bf7\u6c42
        \/\/<\/span> 3.3<\/span> \u5904\u7406\u5ba2\u6237\u8fde\u63a5\u4e0a\u7684\u53ef\u8bfb\u4e8b\u4ef6
        aeProcessEvents(<\/span>eventLoop,<\/span> AE_ALL_EVENTS)<\/span>;<\/span>
        }<\/span>
        }<\/span><\/p>\n

        \u4ee5\u4e0a\u5c31\u662f aeMain \u51fd\u6570\u7684\u6838\u5fc3\u903b\u8f91\u6240\u5728\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u5206\u522b\u5bf9\u5982\u4e0a\u63d0\u5230\u7684\u56db\u4ef6\u4e8b\u60c5\u8fdb\u884c\u8be6\u7ec6\u7684\u9610\u8ff0\u3002<\/p>\n

        3.1 epoll_wait \u53d1\u73b0\u4e8b\u4ef6<\/h4>\n

        Redis \u4e0d\u7ba1\u6709\u591a\u5c11\u4e2a\u7528\u6237\u8fde\u63a5\uff0c\u90fd\u662f\u901a\u8fc7 epoll_wait \u6765\u7edf\u4e00\u53d1\u73b0\u548c\u7ba1\u7406\u5176\u4e0a\u7684\u53ef\u8bfb(\u5305\u62ec liisten socket \u4e0a\u7684 accept\u4e8b\u4ef6)\u3001\u53ef\u5199\u4e8b\u4ef6\u7684\u3002\u751a\u81f3\u8fde timer\uff0c\u4e5f\u90fd\u662f\u4ea4\u7ed9 epoll_wait \u6765\u7edf\u4e00\u7ba1\u7406\u7684\u3002<\/p>\n<\/p>\n

        <\/p>\n

        \u6bcf\u5f53 epoll_wait \u53d1\u73b0\u7279\u5b9a\u7684\u4e8b\u4ef6\u53d1\u751f\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u8c03\u7528\u76f8\u5e94\u7684\u4e8b\u5148\u6ce8\u518c\u597d\u7684\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u8fdb\u884c\u5904\u7406\u3002\u6211\u4eec\u6765\u8be6\u7ec6\u770b aeProcessEvents \u5bf9 epoll_wait \u7684\u5c01\u88c5\u3002<\/p>\n

        \/\/<\/span>file:<\/span>src\/<\/span>ae.c<\/span>
        int<\/span> aeProcessEvents(<\/span>aeEventLoop *<\/span>eventLoop,<\/span> int<\/span> flags)<\/span>
        {<\/span>
        \/\/<\/span> \u83b7\u53d6\u6700\u8fd1\u7684\u65f6\u95f4\u4e8b\u4ef6
        tvp =<\/span> xxx<\/p>\n

        \/\/<\/span> \u5904\u7406\u6587\u4ef6\u4e8b\u4ef6\uff0c\u963b\u585e\u65f6\u95f4\u7531 tvp \u51b3\u5b9a
        numevents =<\/span> aeApiPoll(<\/span>eventLoop,<\/span> tvp)<\/span>;<\/span>
        for (<\/span>j =<\/span> 0<\/span>;<\/span> j numevents;<\/span> j++<\/span>)<\/span> {<\/span>
        \/\/<\/span> \u4ece\u5df2\u5c31\u7eea\u6570\u7ec4\u4e2d\u83b7\u53d6\u4e8b\u4ef6
        aeFileEvent *<\/span>fe =<\/span> &<\/span>eventLoop-><\/span>events[<\/span>eventLoop-><\/span>fired[<\/span>j]<\/span>.fd<\/span>]<\/span>;<\/span><\/p>\n

        \/\/<\/span>\u5982\u679c\u662f\u8bfb\u4e8b\u4ef6\uff0c\u5e76\u4e14\u6709\u8bfb\u56de\u8c03\u51fd\u6570
        fe-><\/span>rfileProc(<\/span>)<\/span><\/p>\n

        \/\/<\/span>\u5982\u679c\u662f\u5199\u4e8b\u4ef6\uff0c\u5e76\u4e14\u6709\u5199\u56de\u8c03\u51fd\u6570
        fe-><\/span>wfileProc(<\/span>)<\/span>
        }<\/span>
        }<\/span><\/p>\n

        \/\/<\/span>file:<\/span> src\/<\/span>ae_epoll.c<\/span>
        static int<\/span> aeApiPoll(<\/span>aeEventLoop *<\/span>eventLoop,<\/span> struct timeval *<\/span>tvp)<\/span> {<\/span>
        \/\/<\/span> \u7b49\u5f85\u4e8b\u4ef6
        aeApiState *<\/span>state =<\/span> eventLoop-><\/span>apidata;<\/span>
        epoll_wait(<\/span>state-><\/span>epfd,<\/span>state-><\/span>events,<\/span>eventLoop-><\/span>setsize,<\/span>
        tvp ? <\/span>(<\/span>tvp-><\/span>tv_sec*<\/span>1000<\/span> +<\/span> tvp-><\/span>tv_usec\/<\/span>1000<\/span>)<\/span> :<\/span> –<\/span>1<\/span>)<\/span>;<\/span>
        …
        }<\/span><\/span><\/p>\n

        aeProcessEvents \u5c31\u662f\u8c03\u7528 epoll_wait \u6765\u53d1\u73b0\u4e8b\u4ef6\u3002\u5f53\u53d1\u73b0\u6709\u67d0\u4e2a fd \u4e0a\u4e8b\u4ef6\u53d1\u751f\u4ee5\u540e\uff0c\u5219\u8c03\u4e3a\u5176\u4e8b\u5148\u6ce8\u518c\u7684\u4e8b\u4ef6\u5904\u7406\u5668\u51fd\u6570 rfileProc \u548c wfileProc\u3002<\/p>\n

        3.2 \u5904\u7406\u65b0\u8fde\u63a5\u8bf7\u6c42<\/h4>\n

        \u6211\u4eec\u5047\u8bbe\u73b0\u5728\u6709\u65b0\u7528\u6237\u8fde\u63a5\u5230\u8fbe\u4e86\u3002\u524d\u9762\u5728\u6211\u4eec\u770b\u5230 listen socket \u4e0a\u7684 rfileProc \u6ce8\u518c\u7684\u662f acceptTcpHandler\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u6709\u8fde\u63a5\u5230\u8fbe\u7684\u65f6\u5019\uff0c\u4f1a\u56de\u8c03\u5230 acceptTcpHandler\u3002<\/p>\n

        \u5728 acceptTcpHandler \u4e2d\uff0c\u4e3b\u8981\u505a\u4e86\u51e0\u4ef6\u4e8b\u60c5<\/p>\n<\/p>\n

        <\/p>\n

          \n
        • \u8c03\u7528 accept \u7cfb\u7edf\u8c03\u7528\u628a\u7528\u6237\u8fde\u63a5\u7ed9\u63a5\u6536\u56de\u6765<\/li>\n
        • \u4e3a\u8fd9\u4e2a\u65b0\u8fde\u63a5\u521b\u5efa\u4e00\u4e2a\u552f\u4e00 redisClient \u5bf9\u8c61<\/li>\n
        • \u5c06\u8fd9\u4e2a\u65b0\u8fde\u63a5\u6dfb\u52a0\u5230 epoll\uff0c\u5e76\u6ce8\u518c\u4e00\u4e2a\u8bfb\u4e8b\u4ef6\u5904\u7406\u51fd\u6570<\/li>\n<\/ul>\n

          \u63a5\u4e0b\u6765\u8ba9\u6211\u4eec\u770b\u4e0a\u9762\u8fd9\u4e09\u4ef6\u4e8b\u60c5\u90fd\u5206\u522b\u662f\u5982\u4f55\u88ab\u5904\u7406\u7684\u3002<\/p>\n

          \/\/<\/span>file:<\/span>src\/<\/span>networking.c<\/span>
          void acceptTcpHandler(<\/span>aeEventLoop *<\/span>el,<\/span> int<\/span> fd,<\/span> …)<\/span> {<\/span>
          cfd =<\/span> anetTcpAccept(<\/span>server.neterr<\/span>,<\/span> fd,<\/span> cip,<\/span> …)<\/span>;<\/span>
          acceptCommonHandler(<\/span>cfd,<\/span>0<\/span>)<\/span>;<\/span>
          }<\/span><\/p>\n

          \u5728 anetTcpAccept \u4e2d\u6267\u884c\u975e\u5e38\u7684\u7b80\u5355\uff0c\u5c31\u662f\u8c03\u7528 accept \u628a\u8fde\u63a5\u63a5\u6536\u56de\u6765\u3002<\/p>\n

          \/\/<\/span>file:<\/span> src\/<\/span>anet.c<\/span>
          int<\/span> anetTcpAccept(<\/span>……)<\/span> {<\/span>
          anetGenericAccept(<\/span>err,<\/span>s,<\/span>(<\/span>struct sockaddr*<\/span>)<\/span>&<\/span>sa,<\/span>&<\/span>salen)<\/span>
          }<\/span>
          static int<\/span> anetGenericAccept(<\/span>……)<\/span> {<\/span>
          fd =<\/span> accept(<\/span>s,<\/span>sa,<\/span>len)<\/span>
          }<\/span><\/p>\n

          \u63a5\u4e0b\u6765\u5728 acceptCommonHandler \u4e3a\u8fd9\u4e2a\u65b0\u7684\u5ba2\u6237\u7aef\u8fde\u63a5 socket\uff0c\u521b\u5efa\u4e00\u4e2a redisClient \u5bf9\u8c61\u3002<\/p>\n

          \/\/<\/span>file:<\/span> src\/<\/span>networking.c<\/span>
          static void acceptCommonHandler(<\/span>int<\/span> fd,<\/span> int<\/span> flags)<\/span> {<\/span>
          \/\/<\/span> \u521b\u5efa redisClient \u5bf9\u8c61
          redisClient *<\/span>c;<\/span>
          c =<\/span> createClient(<\/span>fd)<\/span>;<\/span>
          ……
          }<\/span><\/p>\n

          \u5728 createClient \u4e2d\uff0c\u521b\u5efa client \u5bf9\u8c61\uff0c\u5e76\u4e14\u4e3a\u8be5\u7528\u6237\u8fde\u63a5\u6ce8\u518c\u4e86\u8bfb\u4e8b\u4ef6\u5904\u7406\u5668\u3002<\/p>\n

          \/\/<\/span>file:<\/span>src\/<\/span>networking.c<\/span>
          redisClient *<\/span>createClient(<\/span>int<\/span> fd)<\/span> {<\/span><\/p>\n

          \/\/<\/span> \u4e3a\u7528\u6237\u8fde\u63a5\u521b\u5efa client \u5bf9\u8c61
          redisClient *<\/span>c =<\/span> zmalloc(<\/span>sizeof(<\/span>redisClient)<\/span>)<\/span>;<\/span><\/p>\n

          if (<\/span>fd !=<\/span> –<\/span>1<\/span>)<\/span> {<\/span>
          …<\/p>\n

          \/\/<\/span> \u4e3a\u7528\u6237\u8fde\u63a5\u6ce8\u518c\u8bfb\u4e8b\u4ef6\u5904\u7406\u5668
          aeCreateFileEvent(<\/span>server.el<\/span>,<\/span>fd,<\/span>AE_READABLE,<\/span>
          readQueryFromClient,<\/span> c)<\/span>
          }<\/span>
          …
          }<\/span><\/p>\n

          \u5173\u4e8e aeCreateFileEvent \u7684\u5904\u7406\u8fc7\u7a0b\u8fd9\u91cc\u5c31\u4e0d\u8d58\u8ff0\u4e86\uff0c\u8be6\u60c5\u53c2\u89c1 2.3 \u8282\u3002\u5176\u6548\u679c\u5c31\u662f\u5c06\u8be5\u7528\u6237\u8fde\u63a5 socket fd \u5bf9\u5e94\u7684\u8bfb\u5904\u7406\u51fd\u6570\u8bbe\u7f6e\u4e3a readQueryFromClient, \u5e76\u4e14\u8bbe\u7f6e\u79c1\u6709\u6570\u636e\u4e3a redisClient c\u3002<\/p>\n

          3.3 \u5904\u7406\u5ba2\u6237\u8fde\u63a5\u4e0a\u7684\u53ef\u8bfb\u4e8b\u4ef6<\/h4>\n

          \u73b0\u5728\u5047\u8bbe\u8be5\u7528\u6237\u8fde\u63a5\u6709\u547d\u4ee4\u5230\u8fbe\u4e86\uff0c\u5c31\u5047\u8bbe\u7528\u6237\u53d1\u9001\u4e86GET XXXXXX_KEY \u547d\u4ee4\u3002\u90a3\u4e48\u5728 Redis \u7684\u65f6\u95f4\u5faa\u73af\u4e2d\u8c03\u7528 epoll_wait \u53d1\u73b0\u8be5\u8fde\u63a5\u4e0a\u6709\u8bfb\u65f6\u95f4\u540e\uff0c\u4f1a\u8c03\u7528\u5728\u4e0a\u4e00\u8282\u4e2d\u8ba8\u8bba\u7684\u4e3a\u5176\u6ce8\u518c\u7684\u8bfb\u5904\u7406\u51fd\u6570 readQueryFromClient\u3002<\/p>\n<\/p>\n

          <\/p>\n

          \u5728\u8bfb\u5904\u7406\u51fd\u6570 readQueryFromClient \u4e2d\u4e3b\u8981\u505a\u4e86\u8fd9\u4e48\u51e0\u4ef6\u4e8b\u60c5\u3002<\/p>\n

            \n
          • \u89e3\u6790\u5e76\u67e5\u627e\u547d\u4ee4<\/li>\n
          • \u8c03\u7528\u547d\u4ee4\u5904\u7406<\/li>\n
          • \u6dfb\u52a0\u5199\u4efb\u52a1\u5230\u961f\u5217<\/li>\n
          • \u5c06\u8f93\u51fa\u5199\u5230\u7f13\u5b58\u7b49\u5f85\u53d1\u9001<\/li>\n<\/ul>\n

            \u6211\u4eec\u6765\u8be6\u7ec6\u5730\u770b readQueryFromClient \u7684\u4ee3\u7801\u3002\u5728 readQueryFromClient \u4e2d\u4f1a\u8c03\u7528 processInputBuffer\uff0c\u7136\u540e\u8fdb\u5165 processCommand \u5bf9\u547d\u4ee4\u8fdb\u884c\u5904\u7406\u3002\u5176\u8c03\u7528\u94fe\u5982\u4e0b\uff1a<\/p>\n

            \/\/<\/span>file:<\/span> src\/<\/span>networking.c<\/span>
            void readQueryFromClient(<\/span>aeEventLoop *<\/span>el,<\/span> int<\/span> fd,<\/span> void *<\/span>privdata,<\/span> …)<\/span> {<\/span>
            redisClient *<\/span>c =<\/span> (<\/span>redisClient*<\/span>)<\/span> privdata;<\/span>
            processInputBufferAndReplicate(<\/span>c)<\/span>;<\/span>
            }<\/span><\/p>\n

            void processInputBufferAndReplicate(<\/span>client *<\/span>c)<\/span> {<\/span>
            …
            processInputBuffer(<\/span>c)<\/span>;<\/span>
            }<\/span><\/p>\n

            \/\/<\/span> \u5904\u7406\u5ba2\u6237\u7aef\u8f93\u5165\u7684\u547d\u4ee4\u5185\u5bb9
            void processInputBuffer(<\/span>redisClient *<\/span>c)<\/span> {<\/span>
            \/\/<\/span> \u6267\u884c\u547d\u4ee4\uff0c
            processCommand(<\/span>c)<\/span>;<\/span>
            }<\/span><\/p>\n

            \u6211\u4eec\u518d\u6765\u8be6\u7ec6\u770b processCommand \u3002<\/p>\n

            \/\/<\/span>file:<\/span>
            int<\/span> processCommand(<\/span>redisClient *<\/span>c)<\/span> {<\/span>
            \/\/<\/span> \u67e5\u627e\u547d\u4ee4\uff0c\u5e76\u8fdb\u884c\u547d\u4ee4\u5408\u6cd5\u6027\u68c0\u67e5\uff0c\u4ee5\u53ca\u547d\u4ee4\u53c2\u6570\u4e2a\u6570\u68c0\u67e5
            c-><\/span>cmd =<\/span> c-><\/span>lastcmd =<\/span> lookupCommand(<\/span>c-><\/span>argv[<\/span>0<\/span>]<\/span>-><\/span>ptr)<\/span>;<\/span><\/p>\n

            ……<\/p>\n

            \/\/<\/span> \u5904\u7406\u547d\u4ee4
            \/\/<\/span> \u5982\u679c\u662f MULTI \u4e8b\u52a1\uff0c\u5219\u5165\u961f\uff0c\u5426\u5219\u8c03\u7528 call \u76f4\u63a5\u5904\u7406
            if (<\/span>c-><\/span>flags &<\/span> CLIENT_MULTI &&<\/span> …)<\/span>
            {<\/span>
            queueMultiCommand(<\/span>c)<\/span>;<\/span>
            }<\/span> else {<\/span>
            call(<\/span>c,<\/span>CMD_CALL_FULL)<\/span>;<\/span>
            …
            }<\/span>
            return C_OK;<\/span>
            }<\/span><\/p>\n

            \u6211\u4eec\u5148\u5ffd\u7565 queueMultiCommand\uff0c\u76f4\u63a5\u770b\u6838\u5fc3\u547d\u4ee4\u5904\u7406\u65b9\u6cd5 call\u3002<\/p>\n

            \/\/<\/span>file:<\/span>src\/<\/span>server.c<\/span>
            void call(<\/span>client *<\/span>c,<\/span> int<\/span> flags)<\/span> {<\/span>
            \/\/<\/span> \u67e5\u627e\u5904\u7406\u547d\u4ee4\uff0c
            struct redisCommand *<\/span>real_cmd =<\/span> c-><\/span>cmd;<\/span>
            \/\/<\/span> \u8c03\u7528\u547d\u4ee4\u5904\u7406\u51fd\u6570
            c-><\/span>cmd-><\/span>proc(<\/span>c)<\/span>;<\/span>
            ……
            }<\/span><\/p>\n

            \u5728 server.c \u4e2d\u5b9a\u4e49\u4e86\u6bcf\u4e00\u4e2a\u547d\u4ee4\u5bf9\u5e94\u7684\u5904\u7406\u51fd\u6570<\/p>\n

            \/\/<\/span>file:<\/span>src\/<\/span>server.c<\/span>
            struct redisCommand redisCommandTable[<\/span>]<\/span> =<\/span> {<\/span>
            {<\/span>“module”<\/span>,<\/span>moduleCommand,<\/span>–<\/span>2<\/span>,<\/span>“as”<\/span>,<\/span>0<\/span>,<\/span>NULL<\/span>,<\/span>0<\/span>,<\/span>0<\/span>,<\/span>0<\/span>,<\/span>0<\/span>,<\/span>0<\/span>}<\/span>,<\/span>
            {<\/span>“get”<\/span>,<\/span>getCommand,<\/span>2<\/span>,<\/span>“rF”<\/span>,<\/span>0<\/span>,<\/span>NULL<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>0<\/span>,<\/span>0<\/span>}<\/span>,<\/span>
            {<\/span>“set”<\/span>,<\/span>setCommand,<\/span>–<\/span>3<\/span>,<\/span>“wm”<\/span>,<\/span>0<\/span>,<\/span>NULL<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>0<\/span>,<\/span>0<\/span>}<\/span>,<\/span>
            {<\/span>“setnx”<\/span>,<\/span>setnxCommand,<\/span>3<\/span>,<\/span>“wmF”<\/span>,<\/span>0<\/span>,<\/span>NULL<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>0<\/span>,<\/span>0<\/span>}<\/span>,<\/span>
            {<\/span>“setex”<\/span>,<\/span>setexCommand,<\/span>4<\/span>,<\/span>“wm”<\/span>,<\/span>0<\/span>,<\/span>NULL<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>0<\/span>,<\/span>0<\/span>}<\/span>,<\/span>
            ……<\/p>\n

            {<\/span>“mget”<\/span>,<\/span>mgetCommand,<\/span>–<\/span>2<\/span>,<\/span>“rF”<\/span>,<\/span>0<\/span>,<\/span>NULL<\/span>,<\/span>1<\/span>,<\/span>–<\/span>1<\/span>,<\/span>1<\/span>,<\/span>0<\/span>,<\/span>0<\/span>}<\/span>,<\/span>
            {<\/span>“rpush”<\/span>,<\/span>rpushCommand,<\/span>–<\/span>3<\/span>,<\/span>“wmF”<\/span>,<\/span>0<\/span>,<\/span>NULL<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>0<\/span>,<\/span>0<\/span>}<\/span>,<\/span>
            {<\/span>“lpush”<\/span>,<\/span>lpushCommand,<\/span>–<\/span>3<\/span>,<\/span>“wmF”<\/span>,<\/span>0<\/span>,<\/span>NULL<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>0<\/span>,<\/span>0<\/span>}<\/span>,<\/span>
            {<\/span>“rpushx”<\/span>,<\/span>rpushxCommand,<\/span>–<\/span>3<\/span>,<\/span>“wmF”<\/span>,<\/span>0<\/span>,<\/span>NULL<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>1<\/span>,<\/span>0<\/span>,<\/span>0<\/span>}<\/span>,<\/span>
            ……
            }<\/span><\/p>\n

            \u5bf9\u4e8e get \u547d\u4ee4\u6765\u8bf4\uff0c\u5176\u5bf9\u5e94\u7684\u547d\u4ee4\u5904\u7406\u51fd\u6570\u5c31\u662f getCommand\u3002\u4e5f\u5c31\u662f\u8bf4\u5f53\u5904\u7406 GET \u547d\u4ee4\u6267\u884c\u5230 c->cmd->proc \u7684\u65f6\u5019\u4f1a\u8fdb\u5165\u5230 getCommand \u51fd\u6570\u4e2d\u6765\u3002<\/p>\n

            \/\/<\/span>file:<\/span> src\/<\/span>t_string.c<\/span>
            void getCommand(<\/span>client *<\/span>c)<\/span> {<\/span>
            getGenericCommand(<\/span>c)<\/span>;<\/span>
            }<\/span>
            int<\/span> getGenericCommand(<\/span>client *<\/span>c)<\/span> {<\/span>
            robj *<\/span>o;<\/span><\/p>\n

            if (<\/span>(<\/span>o =<\/span> lookupKeyReadOrReply(<\/span>c,<\/span>c-><\/span>argv[<\/span>1<\/span>]<\/span>,<\/span>shared.null<\/span>[<\/span>c-><\/span>resp]<\/span>)<\/span>)<\/span> ==<\/span> NULL<\/span>)<\/span>
            return C_OK;<\/span>
            …
            addReplyBulk(<\/span>c,<\/span>o)<\/span>;<\/span>
            return C_OK;<\/span>
            }<\/span><\/p>\n

            getGenericCommand \u65b9\u6cd5\u4f1a\u8c03\u7528 lookupKeyReadOrReply \u6765\u4ece\u5185\u5b58\u4e2d\u67e5\u627e\u5bf9\u5e94\u7684 key\u503c\u3002\u5982\u679c\u627e\u4e0d\u5230\uff0c\u5219\u76f4\u63a5\u8fd4\u56de C_OK;\u5982\u679c\u627e\u5230\u4e86\uff0c\u8c03\u7528 addReplyBulk \u65b9\u6cd5\u5c06\u503c\u6dfb\u52a0\u5230\u8f93\u51fa\u7f13\u51b2\u533a\u4e2d\u3002<\/p>\n

            \/\/<\/span>file:<\/span> src\/<\/span>networking.c<\/span>
            void addReplyBulk(<\/span>client *<\/span>c,<\/span> robj *<\/span>obj)<\/span> {<\/span>
            addReplyBulkLen(<\/span>c,<\/span>obj)<\/span>;<\/span>
            addReply(<\/span>c,<\/span>obj)<\/span>;<\/span>
            addReply(<\/span>c,<\/span>shared.crlf<\/span>)<\/span>;<\/span>
            }<\/span><\/p>\n

            \u5176\u4e3b\u9898\u662f\u8c03\u7528 addReply \u6765\u8bbe\u7f6e\u56de\u590d\u6570\u636e\u3002\u5728 addReply \u65b9\u6cd5\u4e2d\u505a\u4e86\u4e24\u4ef6\u4e8b\u60c5\uff1a<\/p>\n

              \n
            • prepareClientToWrite \u5224\u65ad\u662f\u5426\u9700\u8981\u8fd4\u56de\u6570\u636e\uff0c\u5e76\u4e14\u5c06\u5f53\u524d client \u6dfb\u52a0\u5230\u7b49\u5f85\u5199\u8fd4\u56de\u6570\u636e\u961f\u5217\u4e2d\u3002<\/li>\n
            • \u8c03\u7528 _addReplyToBuffer \u548c _addReplyObjectToList \u65b9\u6cd5\u5c06\u8fd4\u56de\u503c\u5199\u5165\u5230\u8f93\u51fa\u7f13\u51b2\u533a\u4e2d\uff0c\u7b49\u5f85\u5199\u5165 socekt<\/li>\n<\/ul>\n

              \/\/<\/span>file:<\/span>src\/<\/span>networking.c<\/span>
              void addReply(<\/span>client *<\/span>c,<\/span> robj *<\/span>obj)<\/span> {<\/span>
              if (<\/span>prepareClientToWrite(<\/span>c)<\/span> !=<\/span> C_OK)<\/span> return;<\/span><\/p>\n

              if (<\/span>sdsEncodedObject(<\/span>obj)<\/span>)<\/span> {<\/span>
              if (<\/span>_addReplyToBuffer(<\/span>c,<\/span>obj-><\/span>ptr,<\/span>sdslen(<\/span>obj-><\/span>ptr)<\/span>)<\/span> !=<\/span> C_OK)<\/span>
              _addReplyStringToList(<\/span>c,<\/span>obj-><\/span>ptr,<\/span>sdslen(<\/span>obj-><\/span>ptr)<\/span>)<\/span>;<\/span>
              }<\/span> else {<\/span>
              ……
              }<\/span>
              }<\/span><\/p>\n

              \u5148\u6765\u770b prepareClientToWrite \u7684\u8be6\u7ec6\u5b9e\u73b0\uff0c<\/p>\n

              \/\/<\/span>file:<\/span> src\/<\/span>networking.c<\/span>
              int<\/span> prepareClientToWrite(<\/span>client *<\/span>c)<\/span> {<\/span>
              ……
              if (<\/span>!<\/span>clientHasPendingReplies(<\/span>c)<\/span> &&<\/span> !<\/span>(<\/span>c-><\/span>flags &<\/span> CLIENT_PENDING_READ)<\/span>)<\/span>
              clientInstallWriteHandler(<\/span>c)<\/span>;<\/span>
              }<\/span><\/p>\n

              \/\/<\/span>file:<\/span>src\/<\/span>networking.c<\/span>
              void clientInstallWriteHandler(<\/span>client *<\/span>c)<\/span> {<\/span>
              c-><\/span>flags |=<\/span> CLIENT_PENDING_WRITE;<\/span>
              listAddNodeHead(<\/span>server.clients_pending_write<\/span>,<\/span>c)<\/span>;<\/span>
              }<\/span><\/p>\n

              \u5176\u4e2d server.clients_pending_write \u5c31\u662f\u6211\u4eec\u8bf4\u7684\u4efb\u52a1\u961f\u5217\uff0c\u961f\u5217\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u90fd\u662f\u6709\u5f85\u5199\u8fd4\u56de\u6570\u636e\u7684 client \u5bf9\u8c61\u3002\u5728 prepareClientToWrite \u51fd\u6570\u4e2d\uff0c\u628a client \u6dfb\u52a0\u5230\u4efb\u52a1\u961f\u5217 server.clients_pending_write \u91cc\u5c31\u7b97\u5b8c\u4e8b\u3002<\/p>\n

              \u63a5\u4e0b\u518d\u6765 _addReplyToBuffer\uff0c\u8be5\u65b9\u6cd5\u662f\u5411\u56fa\u5b9a\u7f13\u5b58\u4e2d\u5199\uff0c\u5982\u679c\u5199\u4e0d\u4e0b\u7684\u8bdd\u5c31\u7ee7\u7eed\u8c03\u7528 _addReplyStringToList \u5f80\u94fe\u8868\u91cc\u5199\u3002\u7b80\u5355\u8d77\u89c1\uff0c\u6211\u4eec\u53ea\u770b _addReplyToBuffer \u7684\u4ee3\u7801\u3002<\/p>\n

              \/\/<\/span>file:<\/span>src\/<\/span>networking.c<\/span>
              int<\/span> _addReplyToBuffer(<\/span>client *<\/span>c,<\/span> const char<\/span> *<\/span>s,<\/span> size_t len)<\/span> {<\/span>
              ……
              \/\/<\/span> \u62f7\u8d1d\u5230 client \u5bf9\u8c61\u7684 Response buffer \u4e2d
              memcpy(<\/span>c-><\/span>buf+<\/span>c-><\/span>bufpos,<\/span>s,<\/span>len)<\/span>;<\/span>
              c-><\/span>bufpos+=<\/span>len;<\/span>
              return C_OK;<\/span>
              }<\/span><\/p>\n

              3.4 beforesleep \u5904\u7406\u5199\u4efb\u52a1\u961f\u5217<\/h4>\n

              \u56de\u60f3\u5728 aeMain \u51fd\u6570\u4e2d\uff0c\u6bcf\u6b21\u5728\u8fdb\u5165 aeProcessEvents \u524d\u90fd\u9700\u8981\u5148\u8fdb\u884c beforesleep \u5904\u7406\u3002\u8fd9\u4e2a\u51fd\u6570\u540d\u5b57\u8d77\u7684\u602a\u602a\u7684\uff0c\u4f46\u5b9e\u9645\u4e0a\u5927\u6709\u7528\u5904\u3002<\/p>\n

              \/\/<\/span>file:<\/span>src\/<\/span>ae.c<\/span>
              void aeMain(<\/span>aeEventLoop *<\/span>eventLoop)<\/span> {<\/span>
              eventLoop-><\/span>stop =<\/span> 0<\/span>;<\/span>
              while (<\/span>!<\/span>eventLoop-><\/span>stop)<\/span> {<\/span>
              \/\/<\/span> beforesleep \u5904\u7406\u5199\u4efb\u52a1\u961f\u5217\u5e76\u5b9e\u9645\u53d1\u9001\u4e4b
              if (<\/span>eventLoop-><\/span>beforesleep !=<\/span> NULL<\/span>)<\/span>
              eventLoop-><\/span>beforesleep(<\/span>eventLoop)<\/span>;<\/span><\/p>\n

              aeProcessEvents(<\/span>eventLoop,<\/span> AE_ALL_EVENTS)<\/span>;<\/span>
              }<\/span>
              }<\/span><\/p>\n

              \u8be5\u51fd\u6570\u5904\u7406\u4e86\u8bb8\u591a\u5de5\u4f5c\uff0c\u5176\u4e2d\u4e00\u9879\u4fbf\u662f\u904d\u5386\u53d1\u9001\u4efb\u52a1\u961f\u5217\uff0c\u5e76\u5c06 client \u53d1\u9001\u7f13\u5b58\u533a\u4e2d\u7684\u5904\u7406\u7ed3\u679c\u901a\u8fc7 write \u53d1\u9001\u5230\u5ba2\u6237\u7aef\u624b\u4e2d\u3002<\/p>\n<\/p>\n

              <\/p>\n

              \u6211\u4eec\u6765\u770b\u4e0b beforeSleep \u7684\u5b9e\u9645\u6e90\u7801\u3002<\/p>\n

              \/\/<\/span>file:<\/span>src\/<\/span>server.c<\/span>
              void beforeSleep(<\/span>struct aeEventLoop *<\/span>eventLoop)<\/span> {<\/span>
              ……
              handleClientsWithPendingWrites(<\/span>)<\/span>;<\/span>
              }<\/span><\/p>\n

              \/\/<\/span>file:<\/span>src\/<\/span>networking.c<\/span>
              int<\/span> handleClientsWithPendingWrites(<\/span>void)<\/span> {<\/span>
              listIter li;<\/span>
              listNode *<\/span>ln;<\/span>
              int<\/span> processed =<\/span> listLength(<\/span>server.clients_pending_write<\/span>)<\/span>;<\/span><\/p>\n

              \/\/<\/span>\u904d\u5386\u5199\u4efb\u52a1\u961f\u5217 server.clients_pending_write<\/span>
              listRewind(<\/span>server.clients_pending_write<\/span>,<\/span>&<\/span>li)<\/span>;<\/span>
              while(<\/span>(<\/span>ln =<\/span> listNext(<\/span>&<\/span>li)<\/span>)<\/span>)<\/span> {<\/span>
              client *<\/span>c =<\/span> listNodeValue(<\/span>ln)<\/span>;<\/span>
              c-><\/span>flags &=<\/span> ~<\/span>CLIENT_PENDING_WRITE;<\/span>
              listDelNode(<\/span>server.clients_pending_write<\/span>,<\/span>ln)<\/span>;<\/span><\/p>\n

              \/\/<\/span>\u5b9e\u9645\u5c06 client \u4e2d\u7684\u7ed3\u679c\u6570\u636e\u53d1\u9001\u51fa\u53bb
              writeToClient(<\/span>c-><\/span>fd,<\/span>c,<\/span>0<\/span>)<\/span><\/p>\n

              \/\/<\/span>\u5982\u679c\u4e00\u6b21\u53d1\u9001\u4e0d\u5b8c\u5219\u51c6\u5907\u4e0b\u4e00\u6b21\u53d1\u9001
              if (<\/span>clientHasPendingReplies(<\/span>c)<\/span>)<\/span> {<\/span>
              \/\/<\/span>\u6ce8\u518c\u4e00\u4e2a\u5199\u4e8b\u4ef6\u5904\u7406\u5668\uff0c\u7b49\u5f85 epoll_wait \u53d1\u73b0\u53ef\u5199\u540e\u518d\u5904\u7406
              aeCreateFileEvent(<\/span>server.el<\/span>,<\/span> c-><\/span>fd,<\/span> ae_flags,<\/span>
              sendReplyToClient,<\/span> c)<\/span>;<\/span>
              }<\/span>
              ……
              }<\/span>
              }<\/span><\/p>\n

              \u5728 handleClientsWithPendingWrites \u4e2d\uff0c\u904d\u5386\u4e86\u53d1\u9001\u4efb\u52a1\u961f\u5217 server.clients_pending_write\uff0c\u5e76\u8c03\u7528 writeToClient \u8fdb\u884c\u5b9e\u9645\u7684\u53d1\u9001\u5904\u7406\u3002<\/p>\n

              \u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u53d1\u9001 write \u5e76\u4e0d\u603b\u662f\u80fd\u4e00\u6b21\u6027\u53d1\u9001\u5b8c\u7684\u3002\u5047\u5982\u8981\u53d1\u9001\u7684\u7ed3\u679c\u592a\u5927\uff0c\u800c\u7cfb\u7edf\u4e3a\u6bcf\u4e2a socket \u8bbe\u7f6e\u7684\u53d1\u9001\u7f13\u5b58\u533a\u53c8\u662f\u6709\u9650\u7684\u3002<\/p>\n

              \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cclientHasPendingReplies \u5224\u65ad\u4ecd\u7136\u6709\u672a\u53d1\u9001\u5b8c\u7684\u6570\u636e\u7684\u8bdd\uff0c\u5c31\u9700\u8981\u6ce8\u518c\u4e00\u4e2a\u5199\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u5230 epoll \u4e0a\u3002\u7b49\u5f85 epoll \u53d1\u73b0\u8be5 socket \u53ef\u5199\u7684\u65f6\u5019\u518d\u6b21\u8c03\u7528 sendReplyToClient\u8fdb\u884c\u53d1\u9001\u3002<\/p>\n

              \/\/<\/span>file:<\/span>src\/<\/span>networking.c<\/span>
              int<\/span> writeToClient(<\/span>int<\/span> fd,<\/span> client *<\/span>c,<\/span> int<\/span> handler_installed)<\/span> {<\/span>
              while(<\/span>clientHasPendingReplies(<\/span>c)<\/span>)<\/span> {<\/span>
              \/\/<\/span> \u5148\u53d1\u9001\u56fa\u5b9a\u7f13\u51b2\u533a
              if (<\/span>c-><\/span>bufpos ><\/span> 0<\/span>)<\/span> {<\/span>
              nwritten =<\/span> write(<\/span>fd,<\/span>c-><\/span>buf+<\/span>c-><\/span>sentlen,<\/span>c-><\/span>bufpos–<\/span>c-><\/span>sentlen)<\/span>;<\/span>
              if (<\/span>nwritten 0<\/span>)<\/span> break;<\/span>
              ……<\/p>\n

              \/\/<\/span> \u518d\u53d1\u9001\u56de\u590d\u94fe\u8868\u4e2d\u6570\u636e
              }<\/span> else {<\/span>
              o =<\/span> listNodeValue(<\/span>listFirst(<\/span>c-><\/span>reply)<\/span>)<\/span>;<\/span>
              nwritten =<\/span> write(<\/span>fd,<\/span> o-><\/span>buf +<\/span> c-><\/span>sentlen,<\/span> objlen –<\/span> c-><\/span>sentlen)<\/span>;<\/span>
              ……
              }<\/span>
              }<\/span>
              }<\/span><\/span><\/p>\n

              writeToClient \u4e2d\u7684\u4e3b\u8981\u903b\u8f91\u5c31\u662f\u8c03\u7528 write \u7cfb\u7edf\u8c03\u7528\u8ba9\u5185\u6838\u5e2e\u5176\u628a\u6570\u636e\u53d1\u9001\u51fa\u53bb\u5373\u53ef\u3002\u7531\u4e8e\u6bcf\u4e2a\u547d\u4ee4\u7684\u5904\u7406\u7ed3\u679c\u5927\u5c0f\u662f\u4e0d\u56fa\u5b9a\u7684\u3002\u6240\u4ee5 Redis \u91c7\u7528\u7684\u505a\u6cd5\u7528\u56fa\u5b9a\u7684 buf + \u53ef\u53d8\u94fe\u8868\u6765\u50a8\u5b58\u7ed3\u679c\u5b57\u7b26\u4e32\u3002\u8fd9\u91cc\u81ea\u7136\u53d1\u9001\u7684\u65f6\u5019\u5c31\u9700\u8981\u5206\u522b\u5bf9\u56fa\u5b9a\u7f13\u5b58\u533a\u548c\u94fe\u8868\u6765\u8fdb\u884c\u53d1\u9001\u4e86\u3002<\/p>\n

              \u56db\u3001\u9ad8\u6027\u80fd Redis \u7f51\u7edc\u539f\u7406\u603b\u7ed3<\/h3>\n

              Redis \u670d\u52a1\u5668\u7aef\u53ea\u9700\u8981\u5355\u7ebf\u7a0b\u53ef\u4ee5\u8fbe\u5230\u975e\u5e38\u9ad8\u7684\u5904\u7406\u80fd\u529b\uff0c\u6bcf\u79d2\u53ef\u4ee5\u8fbe\u5230\u6570\u4e07 QPS \u7684\u9ad8\u5904\u7406\u80fd\u529b\u3002\u5982\u6b64\u9ad8\u6027\u80fd\u7684\u7a0b\u5e8f\u5176\u5b9e\u5c31\u662f\u5bf9 Linux \u63d0\u4f9b\u7684\u591a\u8def\u590d\u7528\u673a\u5236 epoll \u7684\u4e00\u4e2a\u8f83\u4e3a\u5b8c\u7f8e\u7684\u8fd0\u7528\u800c\u5df2\u3002<\/p>\n

              \u5728 Redis \u6e90\u7801\u4e2d\uff0c\u6838\u5fc3\u903b\u8f91\u5176\u5b9e\u5c31\u662f\u4e24\u4e2a\uff0c\u4e00\u4e2a\u662f initServer \u542f\u52a8\u670d\u52a1\uff0c\u53e6\u5916\u4e00\u4e2a\u5c31\u662f aeMain \u4e8b\u4ef6\u5faa\u73af\u3002\u628a\u8fd9\u4e24\u4e2a\u51fd\u6570\u5f04\u61c2\u4e86\uff0cRedis \u5c31\u5403\u900f\u4e00\u5927\u534a\u4e86\u3002<\/p>\n

              \/\/<\/span>file:<\/span> src\/<\/span>server.c<\/span>
              int<\/span> main(<\/span>int<\/span> argc,<\/span> char<\/span> **<\/span>argv)<\/span> {<\/span>
              ……
              \/\/<\/span> \u542f\u52a8\u521d\u59cb\u5316
              initServer(<\/span>)<\/span>;<\/span>
              \/\/<\/span> \u8fd0\u884c\u4e8b\u4ef6\u5904\u7406\u5faa\u73af\uff0c\u4e00\u76f4\u5230\u670d\u52a1\u5668\u5173\u95ed\u4e3a\u6b62
              aeMain(<\/span>server.el<\/span>)<\/span>;<\/span>
              }<\/span><\/p>\n

              \u5728 initServer \u8fd9\u4e2a\u51fd\u6570\u5185\uff0cRedis \u505a\u4e86\u8fd9\u4e48\u4e09\u4ef6\u91cd\u8981\u7684\u4e8b\u60c5\u3002<\/p>\n

                \n
              • \u521b\u5efa\u4e00\u4e2a epoll \u5bf9\u8c61<\/li>\n
              • \u5bf9\u914d\u7f6e\u7684\u76d1\u542c\u7aef\u53e3\u8fdb\u884c listen<\/li>\n
              • \u628a listen socket \u8ba9 epoll \u7ed9\u7ba1\u7406\u8d77\u6765<\/li>\n<\/ul>\n

                \u5728 aeMain \u51fd\u6570\u4e2d\uff0c\u662f\u4e00\u4e2a\u65e0\u4f11\u6b62\u7684\u5faa\u73af\uff0c\u5b83\u662f Redis \u4e2d\u6700\u91cd\u8981\u7684\u90e8\u5206\u3002\u5728\u6bcf\u4e00\u6b21\u7684\u5faa\u73af\u4e2d\uff0c\u8981\u505a\u7684\u4e8b\u60c5\u53ef\u4ee5\u603b\u7ed3\u4e3a\u5982\u4e0b\u56fe\u3002<\/p>\n<\/p>\n

                <\/p>\n

                  \n
                • \u901a\u8fc7 epoll_wait \u53d1\u73b0 listen socket \u4ee5\u53ca\u5176\u5b83\u8fde\u63a5\u4e0a\u7684\u53ef\u8bfb\u3001\u53ef\u5199\u4e8b\u4ef6\u3002<\/li>\n
                • \u82e5\u53d1\u73b0 listen socket \u4e0a\u6709\u65b0\u8fde\u63a5\u5230\u8fbe\uff0c\u5219\u63a5\u6536\u65b0\u8fde\u63a5\uff0c\u5e76\u8ffd\u52a0\u5230 epoll \u4e2d\u8fdb\u884c\u7ba1\u7406\u3002<\/span><\/li>\n
                • \u82e5\u53d1\u73b0\u5176\u5b83 socket \u4e0a\u6709\u547d\u4ee4\u8bf7\u6c42\u5230\u8fbe\uff0c\u5219\u8bfb\u53d6\u548c\u5904\u7406\u547d\u4ee4\uff0c\u628a\u547d\u4ee4\u7ed3\u679c\u5199\u5230\u7f13\u5b58\u4e2d\uff0c\u52a0\u5165\u5199\u4efb\u52a1\u961f\u5217\u3002<\/span><\/li>\n
                • \u6bcf\u4e00\u6b21\u8fdb\u5165 epoll_wait \u524d\u90fd\u8c03\u7528 beforesleep \u6765\u5c06\u5199\u4efb\u52a1\u961f\u5217\u4e2d\u7684\u6570\u636e\u5b9e\u9645\u8fdb\u884c\u53d1\u9001\u3002<\/span><\/li>\n<\/ul>\n

                  \u5176\u5b9e\u4e8b\u4ef6\u5206\u53d1\u5668\u8fd8\u5904\u7406\u4e86\u4e00\u4e2a\u4e0d\u660e\u663e\u7684\u903b\u8f91\uff0c\u90a3\u5c31\u662f\u5982\u679c beforesleep \u5728\u5c06\u7ed3\u679c\u5199\u56de\u7ed9\u5ba2\u6237\u7aef\u7684\u65f6\u5019\uff0c\u5982\u679c\u7531\u4e8e\u5185\u6838 socket \u53d1\u9001\u7f13\u5b58\u533a\u8fc7\u5c0f\u800c\u5bfc\u81f4\u4e0d\u80fd\u4e00\u6b21\u53d1\u9001\u5b8c\u6bd5\u7684\u65f6\u5019\uff0c\u4e5f\u4f1a\u6ce8\u518c\u4e00\u4e2a\u5199\u4e8b\u4ef6\u5904\u7406\u5668\u3002\u7b49\u5230 epoll_wait \u53d1\u73b0\u5bf9\u5e94\u7684 socket \u53ef\u5199\u7684\u65f6\u5019\uff0c\u518d\u6267\u884c write \u5199\u5904\u7406\u3002<\/p>\n

                  \u6574\u4e2a Redis \u7684\u7f51\u7edc\u6838\u5fc3\u6a21\u5757\u5c31\u5728\u54b1\u4eec\u8fd9\u4e00\u7bc7\u6587\u7ae0\u4e2d\u90fd\u53d9\u8ff0\u900f\u4e86(\u5269\u4e0b\u7684 Redis \u5c31\u662f\u5bf9\u5404\u79cd\u6570\u636e\u7ed3\u6784\u7684\u5efa\u7acb\u548c\u5904\u7406\u4e86)\u3002\u76f8\u4fe1\u5403\u900f\u8fd9\u4e00\u7bc7\u5bf9\u4e8e\u4f60\u5bf9\u7f51\u7edc\u7f16\u7a0b\u7684\u7406\u89e3\u4f1a\u6709\u6781\u5927\u7684\u5e2e\u52a9!<\/p>\n","protected":false},"excerpt":{"rendered":"

                  \u6df1\u5ea6\u89e3\u6790\u5355\u7ebf\u7a0b\u7684 Redis \u5982...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201413","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201413"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201413\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201413"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}