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:root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>       1983<\/p>\n<p>       BSD Socket\u8bde\u751f<\/p>\n<p>       1991<\/p>\n<p>       Linux\u9996\u6b21\u5b9e\u73b0Socket<\/p>\n<p>       1996<\/p>\n<p>       Qt 1.0\u53d1\u5e03<\/p>\n<p>       2000<\/p>\n<p>       Qt\u7f51\u7edc\u6a21\u5757\u5f15\u5165<\/p>\n<p>       2011<\/p>\n<p>       Qt5\u73b0\u4ee3\u5316\u7f51\u7edc\u6808<\/p>\n<p>       2020<\/p>\n<p>       Qt6\u6027\u80fd\u7a81\u7834<\/p>\n<p>   Socket\u6280\u672f\u6f14\u8fdb\u53f2<\/p>\n<h3>1.2 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class=\"edgeLabel\"><\/span><\/p>\n<p>           <span class=\"edgeLabel\"><\/span><\/p>\n<p>           <span class=\"edgeLabel\"><\/span><\/p>\n<p>           <span class=\"edgeLabel\"><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u5e94\u7528\u5c42 QByteArray<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u8868\u793a\u5c42 QDataStream<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u4f1a\u8bdd\u5c42 QNetworkSession<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u4f20\u8f93\u5c42 QTcpSocket<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u7f51\u7edc\u5c42 QAbstractSocket<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u94fe\u8def\u5c42 QNetworkInterface<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u7269\u7406\u5c42 \u5e73\u53f0\u9002\u914d\u5c42<\/p>\n<p><\/span><\/p>\n<h3>2.2 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markdown-node-label\"><\/p>\n<p>&#043;\u62e5\u585e\u63a7\u5236\u7b97\u6cd5<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;socket() : \u7cfb\u7edf\u8c03\u7528<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>Hardware<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;NIC\u9a71\u52a8<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;DMA\u5f15\u64ce<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;\u4e2d\u65ad\u5904\u7406<\/p>\n<p><\/span><\/p>\n<h2>\u7b2c\u4e09\u7ae0 \u5b9e\u6218&#xff1a;\u901a\u4fe1\u6838\u5fc3\u5b9e\u73b0\u8be6\u89e3<\/h2>\n<h3>3.1 Qt\u5ba2\u6237\u7aef\u7684\u4e09\u91cd\u5883\u754c<\/h3>\n<p>\u7b2c\u4e00\u91cd&#xff1a;\u57fa\u7840\u8fde\u63a5<\/p>\n<p><span class=\"token comment\">\/\/ \u521b\u5efa\u5177\u6709RAII\u7279\u6027\u7684Socket\u7ba1\u5bb6<\/span><br \/>\nstd<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>QTcpSocket<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token function\">QTcpSocket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8bbe\u7f6e\u8fde\u63a5\u8d85\u65f6\u5b88\u62a4\u8005<\/span><br \/>\n<span class=\"token class-name\">QTimer<\/span><span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">singleShot<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token operator\">&amp;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>socket<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">state<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> QAbstractSocket<span class=\"token double-colon punctuation\">::<\/span>ConnectedState<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        socket<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">abort<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">qWarning<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u8fde\u63a5\u8d85\u65f6&#xff0c;\u542f\u52a8\u91cd\u8fde\u673a\u5236&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7b2c\u4e8c\u91cd&#xff1a;\u6570\u636e\u4ea4\u6362<\/p>\n<p><span class=\"token comment\">\/\/ \u91c7\u7528\u5206\u5757\u4f20\u8f93\u7684\u5927\u578b\u6570\u636e\u5305\u5904\u7406<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">sendChunkedData<\/span><span class=\"token punctuation\">(<\/span>QTcpSocket<span class=\"token operator\">*<\/span> channel<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> QByteArray<span class=\"token operator\">&amp;<\/span> payload<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> CHUNK_SIZE <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1460<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u9002\u914dMTU<\/span><br \/>\n    QDataStream <span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span>channel<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    stream<span class=\"token punctuation\">.<\/span><span class=\"token function\">setVersion<\/span><span class=\"token punctuation\">(<\/span>QDataStream<span class=\"token double-colon punctuation\">::<\/span>Qt_5_15<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> offset <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> offset <span class=\"token operator\">&lt;<\/span> payload<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> offset <span class=\"token operator\">&#043;&#061;<\/span> CHUNK_SIZE<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        QByteArray chunk <span class=\"token operator\">&#061;<\/span> payload<span class=\"token punctuation\">.<\/span><span class=\"token function\">mid<\/span><span class=\"token punctuation\">(<\/span>offset<span class=\"token punctuation\">,<\/span> CHUNK_SIZE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        stream<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeBytes<\/span><span class=\"token punctuation\">(<\/span>chunk<span class=\"token punctuation\">.<\/span><span class=\"token function\">constData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> chunk<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u786e\u4fdd\u6bcf\u5757\u6570\u636e\u90fd\u6709\u786e\u8ba4<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>channel<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">waitForBytesWritten<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">runtime_error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6570\u636e\u4f20\u8f93\u4e2d\u65ad&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7b2c\u4e09\u91cd&#xff1a;\u9ad8\u7ea7\u7279\u6027<\/p>\n<p><span class=\"token comment\">\/\/ \u542f\u7528SSL\u52a0\u5bc6\u901a\u9053<\/span><br \/>\nQSslSocket <span class=\"token operator\">*<\/span>secureChannel <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">QSslSocket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nsecureChannel<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">setProtocol<\/span><span class=\"token punctuation\">(<\/span>QSsl<span class=\"token double-colon punctuation\">::<\/span>TlsV1_3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nsecureChannel<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">connectToHostEncrypted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;secure.example.com&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4433<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u914d\u7f6e\u5fc3\u8df3\u68c0\u6d4b<\/span><br \/>\nQTimer <span class=\"token operator\">*<\/span>heartbeat <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">QTimer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>heartbeat<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>QTimer<span class=\"token double-colon punctuation\">::<\/span>timeout<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>secureChannel<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">state<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> QAbstractSocket<span class=\"token double-colon punctuation\">::<\/span>ConnectedState<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        secureChannel<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\x05&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5fc3\u8df3\u5b57\u8282<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nheartbeat<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">30000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>3.2 Linux\u670d\u52a1\u7aef\u7684\u56db\u7ef4\u4f18\u5316<\/h3>\n<p>\u7ef4\u5ea6\u4e00&#xff1a;\u9ad8\u6548\u5e76\u53d1\u6a21\u578b<\/p>\n<p><span class=\"token comment\">\/\/ \u57fa\u4e8eepoll\u7684\u8fb9\u7f18\u89e6\u53d1\u5b9e\u73b0<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">MAX_EVENTS<\/span> <span class=\"token expression\"><span class=\"token number\">1024<\/span><\/span><\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> ev<span class=\"token punctuation\">,<\/span> events<span class=\"token punctuation\">[<\/span>MAX_EVENTS<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> epoll_fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_create1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8bbe\u7f6e\u975e\u963b\u585eSocket<\/span><br \/>\n<span class=\"token function\">fcntl<\/span><span class=\"token punctuation\">(<\/span>server_fd<span class=\"token punctuation\">,<\/span> F_SETFL<span class=\"token punctuation\">,<\/span> <span class=\"token function\">fcntl<\/span><span class=\"token punctuation\">(<\/span>server_fd<span class=\"token punctuation\">,<\/span> F_GETFL<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">|<\/span> O_NONBLOCK<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>ev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> EPOLLIN <span class=\"token operator\">|<\/span> EPOLLET<span class=\"token punctuation\">;<\/span><br \/>\nev<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> server_fd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epoll_fd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> server_fd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ev<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_wait<\/span><span class=\"token punctuation\">(<\/span>epoll_fd<span class=\"token punctuation\">,<\/span> events<span class=\"token punctuation\">,<\/span> MAX_EVENTS<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>events<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&amp;<\/span> EPOLLERR<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u9519\u8bef\u5904\u7406\u903b\u8f91<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>events<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;&#061;<\/span> server_fd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u63a5\u53d7\u65b0\u8fde\u63a5<\/span><br \/>\n            <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>conn_sock <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>server_fd<span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>addr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">set_nonblocking<\/span><span class=\"token punctuation\">(<\/span>conn_sock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                ev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> EPOLLIN <span class=\"token operator\">|<\/span> EPOLLET<span class=\"token punctuation\">;<\/span><br \/>\n                ev<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> conn_sock<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epoll_fd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> conn_sock<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ev<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5904\u7406\u5ba2\u6237\u7aef\u6570\u636e<\/span><br \/>\n            <span class=\"token function\">process_client<\/span><span class=\"token punctuation\">(<\/span>events<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7ef4\u5ea6\u4e8c&#xff1a;\u96f6\u62f7\u8d1d\u4f18\u5316<\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528sendfile\u7cfb\u7edf\u8c03\u7528<\/span><br \/>\n<span class=\"token keyword\">int<\/span> sendfile_fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;large_file.dat&#034;<\/span><span class=\"token punctuation\">,<\/span> O_RDONLY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">off_t<\/span> offset <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">stat<\/span> file_stat<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">fstat<\/span><span class=\"token punctuation\">(<\/span>sendfile_fd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>file_stat<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u76f4\u63a5\u5728\u5185\u6838\u7a7a\u95f4\u4f20\u8f93\u6587\u4ef6<\/span><br \/>\n<span class=\"token function\">sendfile<\/span><span class=\"token punctuation\">(<\/span>client_fd<span class=\"token punctuation\">,<\/span> sendfile_fd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>offset<span class=\"token punctuation\">,<\/span> file_stat<span class=\"token punctuation\">.<\/span>st_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7ef4\u5ea6\u4e09&#xff1a;\u5185\u5b58\u6c60\u7ba1\u7406<\/p>\n<p><span class=\"token comment\">\/\/ \u81ea\u5b9a\u4e49Socket\u7f13\u51b2\u533a\u5185\u5b58\u6c60<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">POOL_SIZE<\/span> <span class=\"token expression\"><span class=\"token number\">1024<\/span><\/span><\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">time_t<\/span> last_active<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> socket_buffer<span class=\"token punctuation\">;<\/span><\/p>\n<p>socket_buffer pool<span class=\"token punctuation\">[<\/span>POOL_SIZE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u667a\u80fd\u56de\u6536\u673a\u5236<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">check_timeout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">time_t<\/span> now <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> POOL_SIZE<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>pool<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&amp;&amp;<\/span> now <span class=\"token operator\">&#8211;<\/span> pool<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>last_active <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">300<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>pool<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            pool<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7ef4\u5ea6\u56db&#xff1a;\u534f\u8bae\u52a0\u901f<\/p>\n<p><span class=\"token comment\">\/\/ \u81ea\u5b9a\u4e49\u5feb\u901f\u89e3\u6790\u534f\u8bae<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\"><span class=\"token function\">pack<\/span><span class=\"token punctuation\">(<\/span>push<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">uint32_t<\/span> magic<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ 0xA1B2C3D4<\/span><br \/>\n    <span class=\"token class-name\">uint16_t<\/span> version<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u534f\u8bae\u7248\u672c<\/span><br \/>\n    <span class=\"token class-name\">uint64_t<\/span> timestamp<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7eb3\u79d2\u65f6\u95f4\u6233<\/span><br \/>\n    <span class=\"token class-name\">uint32_t<\/span> crc32<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u6821\u9a8c\u548c<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> packet_header<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\"><span class=\"token function\">pack<\/span><span class=\"token punctuation\">(<\/span>pop<span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528SIMD\u6307\u4ee4\u52a0\u901f\u6821\u9a8c<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;nmmintrin.h&gt;<\/span><\/span><br \/>\n<span class=\"token class-name\">uint32_t<\/span> <span class=\"token function\">calculate_crc32<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> data<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> length<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">uint32_t<\/span> crc <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token class-name\">uint8_t<\/span><span class=\"token operator\">*<\/span> p <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token class-name\">uint8_t<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>data<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">size_t<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> length<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        crc <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">_mm_crc32_u8<\/span><span class=\"token punctuation\">(<\/span>crc<span class=\"token punctuation\">,<\/span> p<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> crc<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>\u7b2c\u56db\u7ae0 \u5347\u534e&#xff1a;\u9ad8\u7ea7\u901a\u4fe1\u6a21\u5f0f\u63a2\u7d22<\/h2>\n<h3>4.1 \u6df7\u5408\u534f\u8bae\u67b6\u6784<\/h3>\n<p>  #mermaid-svg-6PlD2DufgEwwSTfT{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-6PlD2DufgEwwSTfT .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-6PlD2DufgEwwSTfT .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-6PlD2DufgEwwSTfT .error-icon{fill:#552222;}#mermaid-svg-6PlD2DufgEwwSTfT .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-6PlD2DufgEwwSTfT .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-6PlD2DufgEwwSTfT .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-6PlD2DufgEwwSTfT 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96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-6PlD2DufgEwwSTfT .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-6PlD2DufgEwwSTfT rect.text{fill:none;stroke-width:0;}#mermaid-svg-6PlD2DufgEwwSTfT .icon-shape,#mermaid-svg-6PlD2DufgEwwSTfT .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-6PlD2DufgEwwSTfT .icon-shape p,#mermaid-svg-6PlD2DufgEwwSTfT .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-6PlD2DufgEwwSTfT .icon-shape rect,#mermaid-svg-6PlD2DufgEwwSTfT .image-shape rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-6PlD2DufgEwwSTfT .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-6PlD2DufgEwwSTfT .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-6PlD2DufgEwwSTfT :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u6df7\u5408\u534f\u8bae\u67b6\u6784<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"edgeLabel\"><\/span><\/p>\n<p>           <span class=\"edgeLabel\"><\/span><\/p>\n<p>           <span class=\"edgeLabel\"><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>HTTP\/3<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>QUIC\u534f\u8bae<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>WebSocket<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>\u539f\u59cbSocket<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>gRPC<\/p>\n<p><\/span><\/p>\n<p>           <span class=\"nodeLabel\"><\/p>\n<p>Protobuf\u7f16\u7801<\/p>\n<p><\/span><\/p>\n<h3>4.2 \u81ea\u9002\u5e94QoS\u7b56\u7565<\/h3>\n<p><span class=\"token comment\">\/\/ \u57fa\u4e8e\u7f51\u7edc\u72b6\u51b5\u7684\u52a8\u6001\u8c03\u6574<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AdaptiveQoS<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">QualityLevel<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        HIGH_QUALITY<span class=\"token punctuation\">,<\/span>    <span class=\"token comment\">\/\/ \u9ad8\u5e26\u5bbd\u6a21\u5f0f<\/span><br \/>\n        BALANCED<span class=\"token punctuation\">,<\/span>        <span class=\"token comment\">\/\/ \u5e73\u8861\u6a21\u5f0f<\/span><br \/>\n        LOW_LATENCY<span class=\"token punctuation\">,<\/span>     <span class=\"token comment\">\/\/ \u4f4e\u5ef6\u8fdf\u6a21\u5f0f<\/span><br \/>\n        LOSS_TOLERANT    <span class=\"token comment\">\/\/ \u6297\u4e22\u5305\u6a21\u5f0f<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">adjustStrategy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> NetworkMetrics<span class=\"token operator\">&amp;<\/span> metrics<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>metrics<span class=\"token punctuation\">.<\/span>bandwidth <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">50<\/span>_Mbps <span class=\"token operator\">&amp;&amp;<\/span> metrics<span class=\"token punctuation\">.<\/span>latency <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">50<\/span>_ms<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            currentLevel <span class=\"token operator\">&#061;<\/span> HIGH_QUALITY<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">setCompression<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">setChunkSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1460<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>metrics<span class=\"token punctuation\">.<\/span>packetLoss <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">5<\/span><span class=\"token operator\">%<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            currentLevel <span class=\"token operator\">&#061;<\/span> LOSS_TOLERANT<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">setFEC<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">setRetryCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\">\/\/ &#8230;\u5176\u4ed6\u6761\u4ef6\u5224\u65ad<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    QualityLevel currentLevel<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h2>\u7b2c\u4e94\u7ae0 \u81f4\u7528&#xff1a;\u884c\u4e1a\u89e3\u51b3\u65b9\u6848\u96c6\u9526<\/h2>\n<h3>5.1 \u5de5\u4e1a\u7269\u8054\u7f51\u65b9\u6848<\/h3>\n<p>  #mermaid-svg-ObNj3uSw6YKbIbyp{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-ObNj3uSw6YKbIbyp .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-ObNj3uSw6YKbIbyp .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-ObNj3uSw6YKbIbyp 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text{fill:#333;}#mermaid-svg-ObNj3uSw6YKbIbyp .cluster-label span{color:#333;}#mermaid-svg-ObNj3uSw6YKbIbyp .cluster-label span p{background-color:transparent;}#mermaid-svg-ObNj3uSw6YKbIbyp .label text,#mermaid-svg-ObNj3uSw6YKbIbyp span{fill:#333;color:#333;}#mermaid-svg-ObNj3uSw6YKbIbyp .node rect,#mermaid-svg-ObNj3uSw6YKbIbyp .node circle,#mermaid-svg-ObNj3uSw6YKbIbyp .node ellipse,#mermaid-svg-ObNj3uSw6YKbIbyp .node polygon,#mermaid-svg-ObNj3uSw6YKbIbyp .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-ObNj3uSw6YKbIbyp .rough-node .label text,#mermaid-svg-ObNj3uSw6YKbIbyp .node .label text,#mermaid-svg-ObNj3uSw6YKbIbyp .image-shape .label,#mermaid-svg-ObNj3uSw6YKbIbyp .icon-shape .label{text-anchor:middle;}#mermaid-svg-ObNj3uSw6YKbIbyp .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-ObNj3uSw6YKbIbyp .rough-node .label,#mermaid-svg-ObNj3uSw6YKbIbyp .node .label,#mermaid-svg-ObNj3uSw6YKbIbyp .image-shape .label,#mermaid-svg-ObNj3uSw6YKbIbyp .icon-shape .label{text-align:center;}#mermaid-svg-ObNj3uSw6YKbIbyp .node.clickable{cursor:pointer;}#mermaid-svg-ObNj3uSw6YKbIbyp .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-ObNj3uSw6YKbIbyp .arrowheadPath{fill:#333333;}#mermaid-svg-ObNj3uSw6YKbIbyp .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-ObNj3uSw6YKbIbyp .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-ObNj3uSw6YKbIbyp .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-ObNj3uSw6YKbIbyp .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-ObNj3uSw6YKbIbyp .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-ObNj3uSw6YKbIbyp .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-ObNj3uSw6YKbIbyp .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-ObNj3uSw6YKbIbyp .cluster text{fill:#333;}#mermaid-svg-ObNj3uSw6YKbIbyp .cluster span{color:#333;}#mermaid-svg-ObNj3uSw6YKbIbyp div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-ObNj3uSw6YKbIbyp .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-ObNj3uSw6YKbIbyp rect.text{fill:none;stroke-width:0;}#mermaid-svg-ObNj3uSw6YKbIbyp .icon-shape,#mermaid-svg-ObNj3uSw6YKbIbyp .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-ObNj3uSw6YKbIbyp .icon-shape p,#mermaid-svg-ObNj3uSw6YKbIbyp .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-ObNj3uSw6YKbIbyp .icon-shape rect,#mermaid-svg-ObNj3uSw6YKbIbyp .image-shape rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-ObNj3uSw6YKbIbyp .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-ObNj3uSw6YKbIbyp .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-ObNj3uSw6YKbIbyp :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>Modbus TCP<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/p>\n<p>\u4f18\u5316\u534f\u8bae<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>PLC\u8bbe\u5907<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Qt\u8fb9\u7f18\u7f51\u5173<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>Linux\u4e91\u5e73\u53f0<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u5927\u6570\u636e\u5206\u6790<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u9884\u6d4b\u6027\u7ef4\u62a4<\/p>\n<p><\/span><\/p>\n<h3>5.2 \u91d1\u878d\u4ea4\u6613\u7cfb\u7edf<\/h3>\n<p><span class=\"token comment\">\/\/ \u4f4e\u5ef6\u8fdf\u4ea4\u6613\u901a\u9053<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">TradingChannel<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">QTcpSocket<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Q_OBJECT<br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">explicit<\/span> <span class=\"token function\">TradingChannel<\/span><span class=\"token punctuation\">(<\/span>QObject <span class=\"token operator\">*<\/span>parent <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span> <span class=\"token function\">QTcpSocket<\/span><span class=\"token punctuation\">(<\/span>parent<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">setSocketOption<\/span><span class=\"token punctuation\">(<\/span>QAbstractSocket<span class=\"token double-colon punctuation\">::<\/span>LowDelayOption<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">setSocketOption<\/span><span class=\"token punctuation\">(<\/span>QAbstractSocket<span class=\"token double-colon punctuation\">::<\/span>KeepAliveOption<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">sendOrder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> Order <span class=\"token operator\">&amp;<\/span>order<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        QByteArray packet<span class=\"token punctuation\">;<\/span><br \/>\n        QDataStream <span class=\"token function\">out<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>packet<span class=\"token punctuation\">,<\/span> QIODevice<span class=\"token double-colon punctuation\">::<\/span>WriteOnly<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        out<span class=\"token punctuation\">.<\/span><span class=\"token function\">setByteOrder<\/span><span class=\"token punctuation\">(<\/span>QDataStream<span class=\"token double-colon punctuation\">::<\/span>LittleEndian<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        out <span class=\"token operator\">&lt;&lt;<\/span> order<span class=\"token punctuation\">.<\/span><span class=\"token function\">serialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u7ed5\u8fc7\u7f13\u51b2\u533a\u76f4\u63a5\u53d1\u9001<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>packet<span class=\"token punctuation\">.<\/span><span class=\"token function\">constData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> packet<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> packet<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            emit <span class=\"token function\">errorOccurred<\/span><span class=\"token punctuation\">(<\/span>SocketWriteError<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h2>\u7b2c\u516d\u7ae0 \u8fdc\u773a&#xff1a;\u672a\u6765\u6f14\u8fdb\u65b9\u5411<\/h2>\n<h3>6.1 \u91cf\u5b50\u901a\u4fe1\u9002\u914d\u5c42<\/h3>\n<p>  #mermaid-svg-DzU6p8rbst8NUqTF{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-DzU6p8rbst8NUqTF .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-DzU6p8rbst8NUqTF .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-DzU6p8rbst8NUqTF .error-icon{fill:#552222;}#mermaid-svg-DzU6p8rbst8NUqTF .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-DzU6p8rbst8NUqTF .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-DzU6p8rbst8NUqTF 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.label{fill:#9370DB;font-size:10px;}#mermaid-svg-DzU6p8rbst8NUqTF .relation{stroke:#333333;stroke-width:1;fill:none;}#mermaid-svg-DzU6p8rbst8NUqTF .dashed-line{stroke-dasharray:3;}#mermaid-svg-DzU6p8rbst8NUqTF .dotted-line{stroke-dasharray:1 2;}#mermaid-svg-DzU6p8rbst8NUqTF #compositionStart,#mermaid-svg-DzU6p8rbst8NUqTF .composition{fill:#333333!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-DzU6p8rbst8NUqTF #compositionEnd,#mermaid-svg-DzU6p8rbst8NUqTF .composition{fill:#333333!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-DzU6p8rbst8NUqTF #dependencyStart,#mermaid-svg-DzU6p8rbst8NUqTF .dependency{fill:#333333!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-DzU6p8rbst8NUqTF #dependencyStart,#mermaid-svg-DzU6p8rbst8NUqTF .dependency{fill:#333333!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-DzU6p8rbst8NUqTF #extensionStart,#mermaid-svg-DzU6p8rbst8NUqTF .extension{fill:transparent!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-DzU6p8rbst8NUqTF #extensionEnd,#mermaid-svg-DzU6p8rbst8NUqTF .extension{fill:transparent!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-DzU6p8rbst8NUqTF #aggregationStart,#mermaid-svg-DzU6p8rbst8NUqTF .aggregation{fill:transparent!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-DzU6p8rbst8NUqTF #aggregationEnd,#mermaid-svg-DzU6p8rbst8NUqTF .aggregation{fill:transparent!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-DzU6p8rbst8NUqTF #lollipopStart,#mermaid-svg-DzU6p8rbst8NUqTF .lollipop{fill:#ECECFF!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-DzU6p8rbst8NUqTF #lollipopEnd,#mermaid-svg-DzU6p8rbst8NUqTF .lollipop{fill:#ECECFF!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-DzU6p8rbst8NUqTF .edgeTerminals{font-size:11px;line-height:initial;}#mermaid-svg-DzU6p8rbst8NUqTF 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