{"id":117050,"date":"2026-10-22T12:40:55","date_gmt":"2026-10-22T04:40:55","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/117050.html"},"modified":"2026-10-22T12:40:55","modified_gmt":"2026-10-22T04:40:55","slug":"c-%e6%b8%b8%e6%88%8f%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%bc%80%e5%8f%91%e4%bb%8e-socket-%e5%88%b0%e5%b9%bf%e6%92%ad%ef%bc%8c%e6%89%8b%e5%86%99%e5%a4%9a%e4%ba%ba%e5%9c%a8%e7%ba%bf%e6%9c%8d%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/117050.html","title":{"rendered":"C++ \u6e38\u620f\u670d\u52a1\u5668\u5f00\u53d1\u4ece Socket \u5230\u5e7f\u64ad\uff0c\u624b\u5199\u591a\u4eba\u5728\u7ebf\u670d\u52a1\u5668"},"content":{"rendered":"

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

1 \u4e3a\u4ec0\u4e48\u6e38\u620f\u670d\u52a1\u5668\u9009\u62e9 C++<\/h3>\n

\u8bf4\u5230\u670d\u52a1\u5668\u5f00\u53d1，Java\u3001Go\u3001Python \u90fd\u662f\u6d41\u884c\u7684\u9009\u62e9\u3002\u4f46\u5728\u5bf9\u6218\u7c7b\u6e38\u620f\u573a\u666f\u4e2d，C++ \u4ecd\u7136\u5360\u636e\u4e3b\u5bfc\u5730\u4f4d，\u539f\u56e0\u6709\u4e09：<\/p>\n\n\u7ef4\u5ea6C++ \u7684\u4f18\u52bf<\/tr>\n\n\n\n\n\n
\u5ef6\u8fdf<\/td>\n\u65e0 GC \u505c\u987f，\u5ef6\u8fdf\u53ef\u63a7\u5728\u6beb\u79d2\u7ea7\u4ee5\u5185<\/td>\n<\/tr>\n
\u541e\u5410\u91cf<\/td>\n\u5355\u673a\u53ef\u652f\u6491\u6570\u5343\u5e76\u53d1\u623f\u95f4<\/td>\n<\/tr>\n
\u5185\u5b58\u63a7\u5236<\/td>\n\u624b\u52a8\u7ba1\u7406，\u65e0\u989d\u5916\u8fd0\u884c\u65f6\u5f00\u9500<\/td>\n<\/tr>\n
\u751f\u6001<\/td>\n\u5927\u91cf\u6210\u719f\u6846\u67b6（Skynet\u3001KBEngine\u3001Pomelo \u7b49）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5f53\u7136，C++ \u4e5f\u6709\u5176\u4ee3\u4ef7：\u5f00\u53d1\u6548\u7387\u76f8\u5bf9\u8f83\u4f4e，\u5185\u5b58 bug（\u91ce\u6307\u9488\u3001double-free）\u66f4\u96be\u6392\u67e5\u3002\u56e0\u6b64，\u6027\u80fd\u8d8a\u654f\u611f\u7684\u7cfb\u7edf，C++ \u7684\u6536\u76ca\u8d8a\u5927；\u5982\u679c\u662f\u5185\u90e8\u5de5\u5177\u6216\u4f4e\u5e76\u53d1\u7cfb\u7edf，\u7528 Go \u5f80\u5f80\u66f4\u5408\u9002\u3002<\/p>\n

2 \u670d\u52a1\u5668\u67b6\u6784\u8bbe\u8ba1<\/h3>\n

2.1 \u603b\u4f53\u67b6\u6784<\/h4>\n

\u672c\u6587\u7684 Demo \u91c7\u7528\u6700\u76f4\u89c2\u7684\u300c\u4e00\u8fde\u63a5\u4e00\u7ebf\u7a0b\u300d\u6a21\u578b，\u4fbf\u4e8e\u7406\u89e3\u6838\u5fc3\u6982\u5ff5：<\/p>\n

\"\u8bf7\u6dfb\u52a0\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

\u4e3b\u7ebf\u7a0b\u4e13\u804c accept()，\u6bcf\u6765\u4e00\u4e2a\u5ba2\u6237\u7aef\u5c31 detach \u4e00\u4e2a\u5b50\u7ebf\u7a0b\u53bb\u5904\u7406\u5b83\u3002\u5b50\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u73a9\u5bb6\u5217\u8868，\u7528 std::mutex \u4fdd\u62a4\u3002<\/p>\n

2.2 \u751f\u4ea7\u73af\u5883\u7684\u6f14\u8fdb<\/h4>\n

\u300c\u4e00\u8fde\u63a5\u4e00\u7ebf\u7a0b\u300d\u7b80\u5355\u76f4\u89c2，\u4f46\u6709\u660e\u663e\u4e0a\u9650\u2014\u2014\u7ebf\u7a0b\u521b\u5efa\u5f00\u9500\u5927，\u4e0a\u5343\u8fde\u63a5\u65f6\u5185\u5b58\u538b\u529b\u663e\u8457\u3002\u751f\u4ea7\u4e2d\u901a\u5e38\u8fc1\u79fb\u5230：<\/p>\n

    \n
  • Reactor \u6a21\u578b + epoll（Linux）：\u5355\u7ebf\u7a0b\u6216\u5c11\u91cf I\/O \u7ebf\u7a0b\u5904\u7406\u6240\u6709\u7f51\u7edc\u4e8b\u4ef6<\/li>\n
  • \u7ebf\u7a0b\u6c60：\u7f51\u7edc I\/O \u4e0e\u4e1a\u52a1\u903b\u8f91\u5206\u79bb<\/li>\n
  • \u534f\u7a0b（C++20 \/ libco）：\u7528\u540c\u6b65\u5199\u6cd5\u5b9e\u73b0\u5f02\u6b65\u6027\u80fd<\/li>\n<\/ul>\n

    \u672c\u6587\u805a\u7126\u300c\u8bfb\u61c2\u6838\u5fc3\u6d41\u7a0b\u300d，\u4e0d\u5f15\u5165\u8fd9\u4e9b\u590d\u6742\u6027\u3002\u60f3\u6df1\u5165\u53ef\u53c2\u8003 muduo \u7f51\u7edc\u5e93\u2014\u2014\u9648\u7855\u8001\u5e08\u7684\u7ecf\u5178\u5f00\u6e90\u5b9e\u73b0\u3002<\/p>\n

    3 \u534f\u8bae\u8bbe\u8ba1<\/h3>\n

    3.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u81ea\u5b9a\u4e49\u534f\u8bae<\/h4>\n

    HTTP \u7684\u5934\u90e8\u5f00\u9500\u5728\u9ad8\u9891\u5c0f\u5305\u573a\u666f\u4e0b\u4ee3\u4ef7\u8f83\u5927\u3002\u6e38\u620f\u670d\u52a1\u5668\u901a\u5e38\u4f7f\u7528\u81ea\u5b9a\u4e49\u4e8c\u8fdb\u5236\u534f\u8bae（\u6781\u81f4\u6027\u80fd）\u6216\u81ea\u5b9a\u4e49\u6587\u672c\u534f\u8bae（\u6613\u4e8e\u8c03\u8bd5）\u3002\u672c\u6587\u9009\u62e9\u6587\u672c\u534f\u8bae，\u7528\u7ad6\u7ebf\u5206\u9694\u5b57\u6bb5，\u6362\u884c\u7b26\u6807\u8bb0\u6d88\u606f\u8fb9\u754c\u3002<\/p>\n

    3.2 \u6d88\u606f\u683c\u5f0f<\/h4>\n\n\u65b9\u5411\u547d\u4ee4\u683c\u5f0f\u793a\u4f8b\u542b\u4e49<\/tr>\n\n\n\n\n\n\n\n\n
    \u5ba2\u6237\u7aef \u2192 \u670d\u52a1\u5668<\/td>\nJOIN<\/td>\nJOIN|Alice<\/td>\n\u73a9\u5bb6\u4ee5\u540d\u5b57 Alice \u52a0\u5165<\/td>\n<\/tr>\n
    \u5ba2\u6237\u7aef \u2192 \u670d\u52a1\u5668<\/td>\nMOVE<\/td>\nMOVE|320.5|240.0<\/td>\n\u73a9\u5bb6\u79fb\u52a8\u5230\u5750\u6807 (320.5, 240.0)<\/td>\n<\/tr>\n
    \u5ba2\u6237\u7aef \u2192 \u670d\u52a1\u5668<\/td>\nQUIT<\/td>\nQUIT<\/td>\n\u73a9\u5bb6\u4e3b\u52a8\u9000\u51fa<\/td>\n<\/tr>\n
    \u670d\u52a1\u5668 \u2192 \u5ba2\u6237\u7aef<\/td>\nWELCOME<\/td>\nWELCOME|7<\/td>\n\u670d\u52a1\u5668\u5206\u914d ID = 7<\/td>\n<\/tr>\n
    \u670d\u52a1\u5668 \u2192 \u5ba2\u6237\u7aef<\/td>\nPLAYER_JOIN<\/td>\nPLAYER_JOIN|7|Alice<\/td>\n\u5e7f\u64ad：7 \u53f7\u73a9\u5bb6\u52a0\u5165<\/td>\n<\/tr>\n
    \u670d\u52a1\u5668 \u2192 \u5ba2\u6237\u7aef<\/td>\nPLAYER_MOVE<\/td>\nPLAYER_MOVE|7|320.5|240.0<\/td>\n\u5e7f\u64ad：7 \u53f7\u73a9\u5bb6\u79fb\u52a8<\/td>\n<\/tr>\n
    \u670d\u52a1\u5668 \u2192 \u5ba2\u6237\u7aef<\/td>\nSNAPSHOT<\/td>\nSNAPSHOT|1,Alice,100,200;2,Bob,300,150<\/td>\n\u5168\u91cf\u73a9\u5bb6\u5feb\u7167<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    3.3 \u7c98\u5305\u5904\u7406<\/h4>\n

    TCP \u662f\u6d41\u5f0f\u534f\u8bae，\u4e0d\u4fdd\u8bc1\u6d88\u606f\u8fb9\u754c\u3002\u4e24\u6761\u6d88\u606f\u53ef\u80fd\u7c98\u5728\u4e00\u8d77\u6536\u5230，\u4e5f\u53ef\u80fd\u4e00\u6761\u6d88\u606f\u88ab\u62c6\u6210\u4e24\u6b21\u6536\u5230\u3002\u672c\u6587\u7528\u300c\u6362\u884c\u7b26\u4f5c\u4e3a\u6d88\u606f\u5206\u9694\u7b26\u300d，\u63a5\u6536\u65f6\u7ef4\u62a4\u4e00\u4e2a\u7f13\u51b2\u533a，\u6309 \\\\n \u5207\u5272\u5904\u7406：<\/p>\n

    \/\/ \u63a5\u6536\u7f13\u51b2\u533a，\u5904\u7406\u7c98\u5305<\/span>
    \nstd::<\/span>string leftover;<\/span><\/p>\n

    int<\/span> n =<\/span> recv<\/span>(<\/span>fd,<\/span> buf,<\/span> BUF_SIZE –<\/span> 1<\/span>,<\/span> 0<\/span>)<\/span>;<\/span>
    \nleftover +=<\/span> buf;<\/span><\/p>\n

    \/\/ \u6309\u6362\u884c\u7b26\u5207\u5272，\u9010\u6761\u5904\u7406<\/span>
    \nsize_t pos;<\/span>
    \nwhile<\/span> (<\/span>(<\/span>pos =<\/span> leftover.<\/span>find<\/span>(<\/span>'\\\\n'<\/span>)<\/span>)<\/span> !=<\/span> std::<\/span>string::<\/span>npos)<\/span> {<\/span>
    \n std::<\/span>string line =<\/span> leftover.<\/span>substr<\/span>(<\/span>0<\/span>,<\/span> pos)<\/span>;<\/span>
    \n leftover =<\/span> leftover.<\/span>substr<\/span>(<\/span>pos +<\/span> 1<\/span>)<\/span>;<\/span>
    \n processMessage<\/span>(<\/span>line)<\/span>;<\/span> \/\/ \u5904\u7406\u5355\u6761\u6d88\u606f<\/span>
    \n}<\/span><\/p>\n

    4 \u6838\u5fc3\u4ee3\u7801\u89e3\u6790<\/h3>\n

    4.1 \u542f\u52a8\u670d\u52a1\u5668（\u56db\u6b65\u8d70）<\/h4>\n

    \u4e00\u4e2a TCP \u670d\u52a1\u5668\u7684\u542f\u52a8\u56fa\u5b9a\u9075\u5faa\u56db\u4e2a\u6b65\u9aa4：<\/p>\n

    \/\/ Step 1: \u521b\u5efa socket（\u5c31\u50cf\u4e70\u4e00\u90e8\u624b\u673a）<\/span>
    \nint<\/span> server_fd =<\/span> socket<\/span>(<\/span>AF_INET,<\/span> SOCK_STREAM,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ Step 2: \u7ed1\u5b9a\u5730\u5740（\u7ed9\u624b\u673a\u88c5\u4e0a SIM \u5361，\u9009\u62e9\u53f7\u7801）<\/span>
    \nsockaddr_in addr{<\/span>}<\/span>;<\/span>
    \naddr.<\/span>sin_family =<\/span> AF_INET;<\/span>
    \naddr.<\/span>sin_port =<\/span> htons<\/span>(<\/span>9999<\/span>)<\/span>;<\/span> \/\/ \u7aef\u53e3 9999<\/span>
    \naddr.<\/span>sin_addr.<\/span>s_addr =<\/span> INADDR_ANY;<\/span> \/\/ \u76d1\u542c\u6240\u6709\u7f51\u5361<\/span>
    \nbind<\/span>(<\/span>server_fd,<\/span> (<\/span>sockaddr*<\/span>)<\/span>&<\/span>addr,<\/span> sizeof<\/span>(<\/span>addr)<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ Step 3: \u5f00\u59cb\u76d1\u542c（\u624b\u673a\u5f00\u673a，\u7b49\u5f85\u6765\u7535）<\/span>
    \nlisten<\/span>(<\/span>server_fd,<\/span> 10<\/span>)<\/span>;<\/span> \/\/ 10 = \u534a\u8fde\u63a5\u961f\u5217\u5927\u5c0f<\/span><\/p>\n

    \/\/ Step 4: \u63a5\u53d7\u8fde\u63a5（\u63a5\u542c\u7535\u8bdd）<\/span>
    \nint<\/span> client_fd =<\/span> accept<\/span>(<\/span>server_fd,<\/span> &<\/span>client_addr,<\/span> &<\/span>client_len)<\/span>;<\/span><\/p>\n

    4.2 \u591a\u7ebf\u7a0b\u5904\u7406\u5ba2\u6237\u7aef<\/h4>\n

    \u6bcf\u6b21 accept() \u8fd4\u56de\u4e00\u4e2a\u65b0\u7684 client_fd，\u7acb\u5373\u5f00\u4e00\u4e2a\u7ebf\u7a0b\u53bb\u5904\u7406\u5b83：<\/p>\n

    while<\/span> (<\/span>true<\/span>)<\/span> {<\/span>
    \n int<\/span> client_fd =<\/span> accept<\/span>(<\/span>server_fd,<\/span> .<\/span>.<\/span>.<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u6bcf\u4e2a\u73a9\u5bb6\u72ec\u7acb\u7ebf\u7a0b，\u4e92\u4e0d\u963b\u585e<\/span>
    \n std::<\/span>thread<\/span>(<\/span>handle_client,<\/span> client_fd)<\/span>.<\/span>detach<\/span>(<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    4.3 \u5e7f\u64ad\u51fd\u6570<\/h4>\n

    \u5e7f\u64ad\u662f\u670d\u52a1\u5668\u7684\u6838\u5fc3\u64cd\u4f5c：\u6536\u5230\u4e00\u4e2a\u73a9\u5bb6\u7684\u6d88\u606f\u540e，\u628a\u7ed3\u679c\u63a8\u9001\u7ed9\u6240\u6709\u5176\u4ed6\u4eba\u3002\u6ce8\u610f\u5fc5\u987b\u52a0\u9501，\u907f\u514d\u591a\u7ebf\u7a0b\u540c\u65f6\u4fee\u6539 g_players \u5bfc\u81f4\u7ade\u6001\u6761\u4ef6：<\/p>\n

    \/\/ \u5168\u5c40\u73a9\u5bb6\u8868 + \u4e92\u65a5\u9501<\/span>
    \nstd::<\/span>map<<\/span>int<\/span>,<\/span> Player><\/span> g_players;<\/span>
    \nstd::<\/span>mutex g_mutex;<\/span><\/p>\n

    void<\/span> broadcast<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> msg,<\/span> int<\/span> exclude_fd =<\/span> –<\/span>1<\/span>)<\/span> {<\/span>
    \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>g_mutex)<\/span>;<\/span> \/\/ RAII \u81ea\u52a8\u89e3\u9501<\/span><\/p>\n

    for<\/span> (<\/span>auto<\/span>&<\/span> [<\/span>fd,<\/span> player]<\/span> :<\/span> g_players)<\/span> {<\/span>
    \n if<\/span> (<\/span>fd !=<\/span> exclude_fd)<\/span> {<\/span> \/\/ \u4e0d\u53d1\u7ed9\u6d88\u606f\u6765\u6e90\u65b9<\/span>
    \n send_msg<\/span>(<\/span>fd,<\/span> msg)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    4.4 \u5b8c\u6574\u6d88\u606f\u5904\u7406\u6d41\u7a0b<\/h4>\n

    \u4ee5\u300c\u73a9\u5bb6\u79fb\u52a8\u300d\u4e3a\u4f8b，\u8d70\u4e00\u904d\u5b8c\u6574\u6d41\u7a0b：<\/p>\n

  • \u5ba2\u6237\u7aef\u53d1\u9001：MOVE|320.5|240.0\\\\n<\/li>\n
  • \u670d\u52a1\u7aef recv() \u63a5\u6536\u5230\u6570\u636e，\u8ffd\u52a0\u5230 leftover \u7f13\u51b2\u533a<\/li>\n
  • \u6309 \\\\n \u5207\u5272，\u5f97\u5230\u4e00\u6761\u5b8c\u6574\u6d88\u606f<\/li>\n
  • \u89e3\u6790\u4e3a cmd=MOVE, x=320.5, y=240.0<\/li>\n
  • \u52a0\u9501，\u66f4\u65b0 g_players[fd].x \u548c .y<\/li>\n
  • broadcast("PLAYER_MOVE|7|320.5|240.0") \u53d1\u7ed9\u6240\u6709\u5176\u4ed6\u73a9\u5bb6<\/li>\n
  • \u5176\u4ed6\u73a9\u5bb6\u7684\u5ba2\u6237\u7aef\u6536\u5230\u6d88\u606f，\u66f4\u65b0\u5bf9\u5e94\u89d2\u8272\u7684\u4f4d\u7f6e<\/li>\n

    4.5 \u5b8c\u6574\u670d\u52a1\u7aef\u4ee3\u7801<\/h4>\n

    \/**
    \n * \u7b80\u6613\u6e38\u620f\u670d\u52a1\u5668 Demo
    \n * \u7f16\u8bd1：g++ -std=c++17 -o game_server game_server.cpp -lpthread
    \n *\/<\/span><\/p>\n

    #<\/span>include<\/span> <iostream><\/span><\/span>
    \n#<\/span>include<\/span> <thread><\/span><\/span>
    \n#<\/span>include<\/span> <mutex><\/span><\/span>
    \n#<\/span>include<\/span> <map><\/span><\/span>
    \n#<\/span>include<\/span> <vector><\/span><\/span>
    \n#<\/span>include<\/span> <string><\/span><\/span>
    \n#<\/span>include<\/span> <sstream><\/span><\/span>
    \n#<\/span>include<\/span> <cstring><\/span><\/span>
    \n#<\/span>include<\/span> <unistd.h><\/span><\/span>
    \n#<\/span>include<\/span> <arpa\/inet.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/socket.h><\/span><\/span>
    \n#<\/span>include<\/span> <netinet\/in.h><\/span><\/span><\/p>\n

    #<\/span>define<\/span> PORT<\/span> 9999<\/span><\/span><\/span>
    \n#<\/span>define<\/span> BUF_SIZE<\/span> 1024<\/span><\/span><\/span><\/p>\n

    struct<\/span> Player<\/span> {<\/span>
    \n int<\/span> fd;<\/span>
    \n int<\/span> id;<\/span>
    \n float<\/span> x,<\/span> y;<\/span>
    \n std::<\/span>string name;<\/span>
    \n}<\/span>;<\/span><\/p>\n

    std::<\/span>map<<\/span>int<\/span>,<\/span> Player><\/span> g_players;<\/span>
    \nstd::<\/span>mutex g_mutex;<\/span>
    \nint<\/span> g_next_id =<\/span> 1<\/span>;<\/span><\/p>\n

    void<\/span> send_msg<\/span>(<\/span>int<\/span> fd,<\/span> const<\/span> std::<\/span>string&<\/span> msg)<\/span> {<\/span>
    \n std::<\/span>string line =<\/span> msg +<\/span> "\\\\n"<\/span>;<\/span>
    \n send<\/span>(<\/span>fd,<\/span> line.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> line.<\/span>size<\/span>(<\/span>)<\/span>,<\/span> 0<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    void<\/span> broadcast<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> msg,<\/span> int<\/span> exclude_fd =<\/span> –<\/span>1<\/span>)<\/span> {<\/span>
    \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>g_mutex)<\/span>;<\/span>
    \n for<\/span> (<\/span>auto<\/span>&<\/span> [<\/span>fd,<\/span> player]<\/span> :<\/span> g_players)<\/span> {<\/span>
    \n if<\/span> (<\/span>fd !=<\/span> exclude_fd)<\/span> send_msg<\/span>(<\/span>fd,<\/span> msg)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    std::<\/span>string make_snapshot<\/span>(<\/span>)<\/span> {<\/span>
    \n std::<\/span>ostringstream oss;<\/span>
    \n oss <<<\/span> "SNAPSHOT|"<\/span>;<\/span>
    \n bool<\/span> first =<\/span> true<\/span>;<\/span>
    \n for<\/span> (<\/span>auto<\/span>&<\/span> [<\/span>fd,<\/span> p]<\/span> :<\/span> g_players)<\/span> {<\/span>
    \n if<\/span> (<\/span>!<\/span>first)<\/span> oss <<<\/span> ";"<\/span>;<\/span>
    \n oss <<<\/span> p.<\/span>id <<<\/span> ","<\/span> <<<\/span> p.<\/span>name <<<\/span> ","<\/span> <<<\/span> p.<\/span>x <<<\/span> ","<\/span> <<<\/span> p.<\/span>y;<\/span>
    \n first =<\/span> false<\/span>;<\/span>
    \n }<\/span>
    \n return<\/span> oss.<\/span>str<\/span>(<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    void<\/span> handle_client<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span>
    \n char<\/span> buf[<\/span>BUF_SIZE]<\/span>;<\/span>
    \n std::<\/span>string leftover;<\/span><\/p>\n

    while<\/span> (<\/span>true<\/span>)<\/span> {<\/span>
    \n int<\/span> n =<\/span> recv<\/span>(<\/span>fd,<\/span> buf,<\/span> BUF_SIZE –<\/span> 1<\/span>,<\/span> 0<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>n <=<\/span> 0<\/span>)<\/span> break<\/span>;<\/span>
    \n buf[<\/span>n]<\/span> =<\/span> '\\\\0'<\/span>;<\/span>
    \n leftover +=<\/span> buf;<\/span><\/p>\n

    size_t pos;<\/span>
    \n while<\/span> (<\/span>(<\/span>pos =<\/span> leftover.<\/span>find<\/span>(<\/span>'\\\\n'<\/span>)<\/span>)<\/span> !=<\/span> std::<\/span>string::<\/span>npos)<\/span> {<\/span>
    \n std::<\/span>string line =<\/span> leftover.<\/span>substr<\/span>(<\/span>0<\/span>,<\/span> pos)<\/span>;<\/span>
    \n leftover =<\/span> leftover.<\/span>substr<\/span>(<\/span>pos +<\/span> 1<\/span>)<\/span>;<\/span><\/p>\n

    std::<\/span>vector<<\/span>std::<\/span>string><\/span> parts;<\/span>
    \n std::<\/span>stringstream ss<\/span>(<\/span>line)<\/span>;<\/span>
    \n std::<\/span>string token;<\/span>
    \n while<\/span> (<\/span>std::<\/span>getline<\/span>(<\/span>ss,<\/span> token,<\/span> '|'<\/span>)<\/span>)<\/span> parts.<\/span>push_back<\/span>(<\/span>token)<\/span>;<\/span>
    \n if<\/span> (<\/span>parts.<\/span>empty<\/span>(<\/span>)<\/span>)<\/span> continue<\/span>;<\/span><\/p>\n

    std::<\/span>string cmd =<\/span> parts[<\/span>0<\/span>]<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>cmd ==<\/span> "JOIN"<\/span> &&<\/span> parts.<\/span>size<\/span>(<\/span>)<\/span> >=<\/span> 2<\/span>)<\/span> {<\/span>
    \n Player p{<\/span> fd,<\/span> 0<\/span>,<\/span> 400<\/span>,<\/span> 300<\/span>,<\/span> parts[<\/span>1<\/span>]<\/span> }<\/span>;<\/span>
    \n {<\/span> std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>g_mutex)<\/span>;<\/span> p.<\/span>id =<\/span> g_next_id++<\/span>;<\/span> g_players[<\/span>fd]<\/span> =<\/span> p;<\/span> }<\/span>
    \n std::<\/span>cout <<<\/span> "[+] "<\/span> <<<\/span> p.<\/span>name <<<\/span> " \u52a0\u5165 (id="<\/span> <<<\/span> p.<\/span>id <<<\/span> ")\\\\n"<\/span>;<\/span>
    \n send_msg<\/span>(<\/span>fd,<\/span> "WELCOME|"<\/span> +<\/span> std::<\/span>to_string<\/span>(<\/span>p.<\/span>id)<\/span>)<\/span>;<\/span>
    \n {<\/span> std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>g_mutex)<\/span>;<\/span> send_msg<\/span>(<\/span>fd,<\/span> make_snapshot<\/span>(<\/span>)<\/span>)<\/span>;<\/span> }<\/span>
    \n broadcast<\/span>(<\/span>"PLAYER_JOIN|"<\/span> +<\/span> std::<\/span>to_string<\/span>(<\/span>p.<\/span>id)<\/span> +<\/span> "|"<\/span> +<\/span> p.<\/span>name,<\/span> fd)<\/span>;<\/span>
    \n }<\/span>
    \n else<\/span> if<\/span> (<\/span>cmd ==<\/span> "MOVE"<\/span> &&<\/span> parts.<\/span>size<\/span>(<\/span>)<\/span> >=<\/span> 3<\/span>)<\/span> {<\/span>
    \n float<\/span> x =<\/span> std::<\/span>stof<\/span>(<\/span>parts[<\/span>1<\/span>]<\/span>)<\/span>,<\/span> y =<\/span> std::<\/span>stof<\/span>(<\/span>parts[<\/span>2<\/span>]<\/span>)<\/span>;<\/span>
    \n int<\/span> pid =<\/span> –<\/span>1<\/span>;<\/span>
    \n {<\/span> std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>g_mutex)<\/span>;<\/span>
    \n if<\/span> (<\/span>g_players.<\/span>count<\/span>(<\/span>fd)<\/span>)<\/span> {<\/span> g_players[<\/span>fd]<\/span>.<\/span>x =<\/span> x;<\/span> g_players[<\/span>fd]<\/span>.<\/span>y =<\/span> y;<\/span> pid =<\/span> g_players[<\/span>fd]<\/span>.<\/span>id;<\/span> }<\/span> }<\/span>
    \n if<\/span> (<\/span>pid !=<\/span> –<\/span>1<\/span>)<\/span>
    \n broadcast<\/span>(<\/span>"PLAYER_MOVE|"<\/span> +<\/span> std::<\/span>to_string<\/span>(<\/span>pid)<\/span> +<\/span> "|"<\/span> +<\/span> std::<\/span>to_string<\/span>(<\/span>x)<\/span> +<\/span> "|"<\/span> +<\/span> std::<\/span>to_string<\/span>(<\/span>y)<\/span>,<\/span> fd)<\/span>;<\/span>
    \n }<\/span>
    \n else<\/span> if<\/span> (<\/span>cmd ==<\/span> "QUIT"<\/span>)<\/span> break<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    int<\/span> pid =<\/span> –<\/span>1<\/span>;<\/span> std::<\/span>string pname;<\/span>
    \n {<\/span> std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>g_mutex)<\/span>;<\/span>
    \n if<\/span> (<\/span>g_players.<\/span>count<\/span>(<\/span>fd)<\/span>)<\/span> {<\/span> pid =<\/span> g_players[<\/span>fd]<\/span>.<\/span>id;<\/span> pname =<\/span> g_players[<\/span>fd]<\/span>.<\/span>name;<\/span> g_players.<\/span>erase<\/span>(<\/span>fd)<\/span>;<\/span> }<\/span> }<\/span>
    \n close<\/span>(<\/span>fd)<\/span>;<\/span>
    \n if<\/span> (<\/span>pid !=<\/span> –<\/span>1<\/span>)<\/span> {<\/span>
    \n std::<\/span>cout <<<\/span> "[-] "<\/span> <<<\/span> pname <<<\/span> " \u79bb\u5f00\\\\n"<\/span>;<\/span>
    \n broadcast<\/span>(<\/span>"PLAYER_QUIT|"<\/span> +<\/span> std::<\/span>to_string<\/span>(<\/span>pid)<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
    \n int<\/span> server_fd =<\/span> socket<\/span>(<\/span>AF_INET,<\/span> SOCK_STREAM,<\/span> 0<\/span>)<\/span>;<\/span>
    \n int<\/span> opt =<\/span> 1<\/span>;<\/span>
    \n setsockopt<\/span>(<\/span>server_fd,<\/span> SOL_SOCKET,<\/span> SO_REUSEADDR,<\/span> &<\/span>opt,<\/span> sizeof<\/span>(<\/span>opt)<\/span>)<\/span>;<\/span><\/p>\n

    sockaddr_in addr{<\/span>}<\/span>;<\/span>
    \n addr.<\/span>sin_family =<\/span> AF_INET;<\/span>
    \n addr.<\/span>sin_port =<\/span> htons<\/span>(<\/span>PORT)<\/span>;<\/span>
    \n addr.<\/span>sin_addr.<\/span>s_addr =<\/span> INADDR_ANY;<\/span>
    \n bind<\/span>(<\/span>server_fd,<\/span> (<\/span>sockaddr*<\/span>)<\/span>&<\/span>addr,<\/span> sizeof<\/span>(<\/span>addr)<\/span>)<\/span>;<\/span>
    \n listen<\/span>(<\/span>server_fd,<\/span> 10<\/span>)<\/span>;<\/span><\/p>\n

    std::<\/span>cout <<<\/span> "\u6e38\u620f\u670d\u52a1\u5668\u542f\u52a8，\u76d1\u542c\u7aef\u53e3 "<\/span> <<<\/span> PORT <<<\/span> "…\\\\n"<\/span>;<\/span><\/p>\n

    while<\/span> (<\/span>true<\/span>)<\/span> {<\/span>
    \n sockaddr_in client_addr{<\/span>}<\/span>;<\/span>
    \n socklen_t client_len =<\/span> sizeof<\/span>(<\/span>client_addr)<\/span>;<\/span>
    \n int<\/span> client_fd =<\/span> accept<\/span>(<\/span>server_fd,<\/span> (<\/span>sockaddr*<\/span>)<\/span>&<\/span>client_addr,<\/span> &<\/span>client_len)<\/span>;<\/span>
    \n if<\/span> (<\/span>client_fd <<\/span> 0<\/span>)<\/span> continue<\/span>;<\/span>
    \n std::<\/span>thread<\/span>(<\/span>handle_client,<\/span> client_fd)<\/span>.<\/span>detach<\/span>(<\/span>)<\/span>;<\/span>
    \n }<\/span><\/p>\n

    close<\/span>(<\/span>server_fd)<\/span>;<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    5 \u8fd0\u884c Demo<\/h3>\n

    5.1 \u7f16\u8bd1\u4e0e\u542f\u52a8<\/h4>\n

    # \u7f16\u8bd1（\u9700\u8981 g++ \u652f\u6301 C++17）<\/span>
    \ng++ -std<\/span>=<\/span>c++17 -o<\/span> game_server game_server.cpp -lpthread<\/span><\/p>\n

    # \u542f\u52a8<\/span>
    \n.\/game_server
    \n# \u8f93\u51fa：\u6e38\u620f\u670d\u52a1\u5668\u542f\u52a8，\u76d1\u542c\u7aef\u53e3 9999…<\/span><\/p>\n

    5.2 \u7528 telnet \u624b\u52a8\u6d4b\u8bd5<\/h4>\n

    \u4e0d\u9700\u8981\u5ba2\u6237\u7aef\u7a0b\u5e8f，\u76f4\u63a5\u7528 telnet \u6a21\u62df\u73a9\u5bb6：<\/p>\n

    # \u7ec8\u7aef 1：\u73a9\u5bb6 Alice<\/span>
    \ntelnet localhost 9999<\/span>
    \n><\/span> JOIN|<\/span>Alice
    \n<<\/span> WELCOME|<\/span>1<\/span>
    \n<<\/span> SNAPSHOT|<\/span><\/p>\n

    # \u7ec8\u7aef 2：\u73a9\u5bb6 Bob（\u65b0\u5f00\u4e00\u4e2a\u7ec8\u7aef）<\/span>
    \ntelnet localhost 9999<\/span>
    \n><\/span> JOIN|<\/span>Bob
    \n<<\/span> WELCOME|<\/span>2<\/span>
    \n<<\/span> SNAPSHOT|<\/span>1<\/span>,Alice,400,300 \u2190 \u770b\u5230\u5df2\u6709\u73a9\u5bb6<\/p>\n

    # \u6b64\u65f6\u7ec8\u7aef 1 \u6536\u5230：<\/span>
    \n<<\/span> PLAYER_JOIN|<\/span>2<\/span>|<\/span>Bob<\/p>\n

    # \u7ec8\u7aef 2 \u79fb\u52a8：<\/span>
    \n><\/span> MOVE|<\/span>100<\/span>|<\/span>200<\/span>
    \n# \u7ec8\u7aef 1 \u6536\u5230：<\/span>
    \n<<\/span> PLAYER_MOVE|<\/span>2<\/span>|<\/span>100.0<\/span>|<\/span>200.0<\/span><\/p>\n

    5.3 \u6d4f\u89c8\u5668\u53ef\u89c6\u5316\u5ba2\u6237\u7aef<\/h4>\n

    \u914d\u5957\u7684 game_client.html \u63d0\u4f9b\u5b9e\u65f6\u53ef\u89c6\u5316\u754c\u9762：<\/p>\n

      \n
    • \u6253\u5f00\u540e\u8f93\u5165\u670d\u52a1\u5668\u5730\u5740，\u70b9\u51fb Connect<\/li>\n
    • WASD \/ \u65b9\u5411\u952e\u63a7\u5236\u89d2\u8272\u79fb\u52a8，\u70b9\u51fb\u5730\u56fe\u53ef\u4f20\u9001<\/li>\n
    • \u591a\u6807\u7b7e\u9875\u6253\u5f00\u5373\u53ef\u770b\u5230\u591a\u4e2a\u73a9\u5bb6\u5b9e\u65f6\u540c\u6b65\u4f4d\u7f6e<\/li>\n
    • \u6ca1\u6709\u670d\u52a1\u5668？\u70b9\u51fb Connect \u540e\u81ea\u52a8\u8fdb\u5165 Demo \u6a21\u5f0f（\u5185\u7f6e Bot）<\/li>\n<\/ul>\n

      6 \u6027\u80fd\u74f6\u9888\u4e0e\u4f18\u5316\u65b9\u5411<\/h3>\n

      \u5f53\u524d Demo \u5728\u6559\u5b66\u4e0a\u8db3\u591f\u6e05\u6670，\u4f46\u6709\u51e0\u4e2a\u663e\u800c\u6613\u89c1\u7684\u751f\u4ea7\u95ee\u9898：<\/p>\n\n\u95ee\u9898\u73b0\u72b6\u4f18\u5316\u65b9\u5411<\/tr>\n\n\n\n\n\n\n
      \u5e76\u53d1\u6a21\u578b<\/td>\n\u4e00\u8fde\u63a5\u4e00\u7ebf\u7a0b<\/td>\nepoll + \u7ebf\u7a0b\u6c60 \/ \u534f\u7a0b<\/td>\n<\/tr>\n
      \u6d88\u606f\u89e3\u6790<\/td>\n\u6587\u672c\u534f\u8bae，\u6709\u989d\u5916 CPU \u5f00\u9500<\/td>\nProtobuf \u6216\u81ea\u5b9a\u4e49\u4e8c\u8fdb\u5236\u534f\u8bae<\/td>\n<\/tr>\n
      \u5e7f\u64ad\u4f18\u5316<\/td>\n\u904d\u5386\u6240\u6709\u73a9\u5bb6<\/td>\n\u6309\u623f\u95f4 \/ AOI \u533a\u57df\u8fc7\u6ee4<\/td>\n<\/tr>\n
      \u72b6\u6001\u540c\u6b65<\/td>\n\u6bcf\u6b21 MOVE \u5e7f\u64ad\u5b8c\u6574\u5750\u6807<\/td>\n\u5e27\u540c\u6b65 \/ \u589e\u91cf\u540c\u6b65，\u964d\u4f4e\u5e26\u5bbd<\/td>\n<\/tr>\n
      \u9632\u4f5c\u5f0a<\/td>\n\u65e0\u6821\u9a8c<\/td>\n\u670d\u52a1\u5668\u6743\u5a01\u8ba1\u7b97，\u5ba2\u6237\u7aef\u4ec5\u63d0\u4ea4\u64cd\u4f5c\u8f93\u5165<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      6.1 epoll \u6539\u9020\u601d\u8def<\/h4>\n

      \u7528 epoll \u66ff\u6362\u300c\u4e00\u7ebf\u7a0b\u4e00\u8fde\u63a5\u300d，\u5355\u7ebf\u7a0b\u53ef\u76d1\u542c\u6570\u4e07\u4e2a fd：<\/p>\n

      int<\/span> epfd =<\/span> epoll_create1<\/span>(<\/span>0<\/span>)<\/span>;<\/span><\/p>\n

      \/\/ \u6ce8\u518c\u76d1\u542c socket<\/span>
      \nepoll_event ev{<\/span> .<\/span>events =<\/span> EPOLLIN,<\/span> .<\/span>data.<\/span>fd =<\/span> server_fd }<\/span>;<\/span>
      \nepoll_ctl<\/span>(<\/span>epfd,<\/span> EPOLL_CTL_ADD,<\/span> server_fd,<\/span> &<\/span>ev)<\/span>;<\/span><\/p>\n

      while<\/span> (<\/span>true<\/span>)<\/span> {<\/span>
      \n epoll_event events[<\/span>64<\/span>]<\/span>;<\/span>
      \n int<\/span> n =<\/span> epoll_wait<\/span>(<\/span>epfd,<\/span> events,<\/span> 64<\/span>,<\/span> –<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

      for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> n;<\/span> i++<\/span>)<\/span> {<\/span>
      \n if<\/span> (<\/span>events[<\/span>i]<\/span>.<\/span>data.<\/span>fd ==<\/span> server_fd)<\/span> {<\/span>
      \n \/\/ \u65b0\u8fde\u63a5<\/span>
      \n int<\/span> client_fd =<\/span> accept<\/span>(<\/span>server_fd,<\/span> .<\/span>.<\/span>.<\/span>)<\/span>;<\/span>
      \n epoll_ctl<\/span>(<\/span>epfd,<\/span> EPOLL_CTL_ADD,<\/span> client_fd,<\/span> .<\/span>.<\/span>.<\/span>)<\/span>;<\/span>
      \n }<\/span> else<\/span> {<\/span>
      \n \/\/ \u5df2\u6709\u8fde\u63a5\u6709\u6570\u636e\u53ef\u8bfb<\/span>
      \n handle_data<\/span>(<\/span>events[<\/span>i]<\/span>.<\/span>data.<\/span>fd)<\/span>;<\/span>
      \n }<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      7 \u603b\u7ed3<\/h3>\n

      \u901a\u8fc7\u8fd9\u4e2a Demo，\u6211\u4eec\u8d70\u5b8c\u4e86 C++ \u6e38\u620f\u670d\u52a1\u5668\u7684\u6700\u5c0f\u95ed\u73af：<\/p>\n

        \n
      • \u2705 \u7528 4 \u4e2a\u7cfb\u7edf\u8c03\u7528（socket \/ bind \/ listen \/ accept）\u642d\u8d77 TCP \u670d\u52a1<\/li>\n
      • \u2705 \u591a\u7ebf\u7a0b\u5904\u7406\u5e76\u53d1\u8fde\u63a5，mutex \u4fdd\u62a4\u5171\u4eab\u72b6\u6001<\/li>\n
      • \u2705 \u8bbe\u8ba1\u7b80\u5355\u6587\u672c\u534f\u8bae，\u6b63\u786e\u5904\u7406\u7c98\u5305\u95ee\u9898<\/li>\n
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