{"id":48810,"date":"2025-07-30T13:38:59","date_gmt":"2025-07-30T05:38:59","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/48810.html"},"modified":"2025-07-30T13:38:59","modified_gmt":"2025-07-30T05:38:59","slug":"%e4%bd%bf%e7%94%a8asio%e7%9a%84%e5%8d%8f%e7%a8%8b%e5%ae%9e%e7%8e%b0%e9%ab%98%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/48810.html","title":{"rendered":"\u4f7f\u7528ASIO\u7684\u534f\u7a0b\u5b9e\u73b0\u9ad8\u5e76\u53d1\u670d\u52a1\u5668"},"content":{"rendered":"

\u4f7f\u7528ASIO\u7684\u534f\u7a0b\u5b9e\u73b0\u9ad8\u5e76\u53d1\u670d\u52a1\u5668<\/h2>\n

\u5728 C++ \u7f51\u7edc\u7f16\u7a0b\u9886\u57df，Asio \u5e93\u63d0\u4f9b\u4e86\u4e24\u79cd\u4e3b\u8981\u7684\u5f02\u6b65\u7f16\u7a0b\u8303\u5f0f：\u4f20\u7edf\u7684\u56de\u8c03\u6a21\u5f0f\u548c\u57fa\u4e8e\u534f\u7a0b\u7684\u73b0\u4ee3\u6a21\u5f0f，\u4f20\u7edf\u7684\u56de\u8c03\u6a21\u5f0f\u5927\u5bb6\u90fd\u5f88\u6e05\u695a，\u8fd9\u91cc\u4e0d\u591a\u505a\u4ecb\u7ecd，\u672c\u6587\u4e3b\u8981\u4ecb\u7ecd\u57fa\u4e8e\u534f\u7a0b\u7684\u6a21\u5f0f，Asio \u534f\u7a0b\u57fa\u4e8e C++20 \u6807\u51c6\u534f\u7a0b，\u63d0\u4f9b\u4e86\u66f4\u7b80\u6d01\u7684\u5f02\u6b65\u7f16\u7a0b\u6a21\u578b\u3002<\/p>\n

ASIO\u534f\u7a0b\u548c\u56de\u8c03\u5bf9\u6bd4<\/h3>\n

\u4e0b\u9762\u5148\u5217\u4e3e\u4e00\u4e0bASIO\u4f7f\u7528\u56de\u8c03\u548c\u4f7f\u7528\u534f\u7a0b\u7684\u533a\u522b，\u7b49\u770b\u5b8c\u533a\u522b\u540e\u518d\u8bb2\u8bb2ASIO\u4f7f\u7528\u534f\u7a0b\u7684\u6838\u5fc3\u5173\u952e\u51fd\u6570\u6709\u54ea\u4e9b<\/p>\n

\u8ba9\u6211\u7528\u4e00\u4e2a\u66f4\u751f\u52a8\u7684\u5b9a\u65f6\u5668\u793a\u4f8b\u6765\u5c55\u793a\u534f\u7a0b\u5982\u4f55\u4f18\u96c5\u5730\u89e3\u51b3\u56de\u8c03\u5730\u72f1\u95ee\u9898\u3002\u6211\u4eec\u5c06\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u4f46\u5e38\u89c1\u9700\u6c42：<\/p>\n

\u6bcf\u96943\u79d2\u6253\u5370\u4e00\u6b21\u6d88\u606f，\u5171\u6253\u53705\u6b21\u3002<\/p>\n

\u8981\u5b9e\u73b0\u4e0a\u9762\u8fd9\u4e2a\u529f\u80fd，\u7528\u4f20\u7edf\u7684\u56de\u8c03\u5b9e\u73b0\u662f\u5f88\u9ebb\u70e6\u7684，\u4e0b\u9762\u662f\u7528\u56de\u8c03\u5b9e\u73b0\u7684\u4ee3\u7801（\u4e3a\u4e86\u66f4\u6e05\u6670，\u8fd9\u91cc\u4e0d\u7528lambda\u8868\u8fbe\u5f0f）：<\/p>\n

#<\/span>include<\/span> <boost\/asio.hpp><\/span><\/span>
\n#<\/span>include<\/span> <iostream><\/span><\/span><\/p>\n

namespace<\/span> asio =<\/span> boost::<\/span>asio;<\/span><\/p>\n

\/\/ \u524d\u5411\u58f0\u660e<\/span>
\nvoid<\/span> timer_callback1<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span>;<\/span>
\nvoid<\/span> timer_callback2<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span>;<\/span>
\nvoid<\/span> timer_callback3<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span>;<\/span>
\nvoid<\/span> timer_callback4<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span>;<\/span>
\nvoid<\/span> timer_callback5<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span>;<\/span>
\nvoid<\/span> final_callback<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span>;<\/span><\/p>\n

\/\/ \u5904\u7406\u7b2c\u4e00\u6b21\u5b9a\u65f6\u5668\u5230\u671f<\/span>
\nvoid<\/span> timer_callback1<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span> {<\/span>
\n std::<\/span>cout <<<\/span> "\u56de\u8c03\u6a21\u5f0f: \u7b2c1\u6b21\u6253\u5370 – 3\u79d2\u5df2\u8fc7\\\\n"<\/span>;<\/span>
\n timer-><\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
\n timer-><\/span>async_wait<\/span>(<\/span>
\n std::<\/span>bind<\/span>(<\/span>timer_callback2,<\/span> timer,<\/span> count +<\/span> 1<\/span>)<\/span>
\n )<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u5904\u7406\u7b2c\u4e8c\u6b21\u5b9a\u65f6\u5668\u5230\u671f<\/span>
\nvoid<\/span> timer_callback2<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span> {<\/span>
\n std::<\/span>cout <<<\/span> "\u56de\u8c03\u6a21\u5f0f: \u7b2c2\u6b21\u6253\u5370 – 3\u79d2\u5df2\u8fc7\\\\n"<\/span>;<\/span>
\n timer-><\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
\n timer-><\/span>async_wait<\/span>(<\/span>
\n std::<\/span>bind<\/span>(<\/span>timer_callback3,<\/span> timer,<\/span> count +<\/span> 1<\/span>)<\/span>
\n )<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u5904\u7406\u7b2c\u4e09\u6b21\u5b9a\u65f6\u5668\u5230\u671f<\/span>
\nvoid<\/span> timer_callback3<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span> {<\/span>
\n std::<\/span>cout <<<\/span> "\u56de\u8c03\u6a21\u5f0f: \u7b2c3\u6b21\u6253\u5370 – 3\u79d2\u5df2\u8fc7\\\\n"<\/span>;<\/span>
\n timer-><\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
\n timer-><\/span>async_wait<\/span>(<\/span>
\n std::<\/span>bind<\/span>(<\/span>timer_callback4,<\/span> timer,<\/span> count +<\/span> 1<\/span>)<\/span>
\n )<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u5904\u7406\u7b2c\u56db\u6b21\u5b9a\u65f6\u5668\u5230\u671f<\/span>
\nvoid<\/span> timer_callback4<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span> {<\/span>
\n std::<\/span>cout <<<\/span> "\u56de\u8c03\u6a21\u5f0f: \u7b2c4\u6b21\u6253\u5370 – 3\u79d2\u5df2\u8fc7\\\\n"<\/span>;<\/span>
\n timer-><\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
\n timer-><\/span>async_wait<\/span>(<\/span>
\n std::<\/span>bind<\/span>(<\/span>timer_callback5,<\/span> timer,<\/span> count +<\/span> 1<\/span>)<\/span>
\n )<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u5904\u7406\u7b2c\u4e94\u6b21\u5b9a\u65f6\u5668\u5230\u671f<\/span>
\nvoid<\/span> timer_callback5<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span> {<\/span>
\n std::<\/span>cout <<<\/span> "\u56de\u8c03\u6a21\u5f0f: \u7b2c5\u6b21\u6253\u5370 – 3\u79d2\u5df2\u8fc7\\\\n"<\/span>;<\/span>
\n timer-><\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
\n timer-><\/span>async_wait<\/span>(<\/span>
\n std::<\/span>bind<\/span>(<\/span>final_callback,<\/span> timer,<\/span> count +<\/span> 1<\/span>)<\/span>
\n )<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u6700\u7ec8\u56de\u8c03<\/span>
\nvoid<\/span> final_callback<\/span>(<\/span>asio::<\/span>steady_timer*<\/span> timer,<\/span> int<\/span> count)<\/span> {<\/span>
\n std::<\/span>cout <<<\/span> "\u56de\u8c03\u6a21\u5f0f: \u5b8c\u6210"<\/span> <<<\/span> count <<<\/span> "\u6b21\u6253\u5370\\\\n"<\/span>;<\/span>
\n delete<\/span> timer;<\/span> \/\/ \u6e05\u7406\u8d44\u6e90<\/span>
\n}<\/span><\/p>\n

\/\/ \u542f\u52a8\u5b9a\u65f6\u5668\u5e8f\u5217<\/span>
\nvoid<\/span> start_timer_sequence<\/span>(<\/span>asio::<\/span>io_context&<\/span> io)<\/span> {<\/span>
\n \/\/ \u5728\u5806\u4e0a\u521b\u5efa\u5b9a\u65f6\u5668（\u9700\u8981\u5728\u6574\u4e2a\u5e8f\u5217\u4e2d\u4fdd\u6301\u5b58\u6d3b）<\/span>
\n asio::<\/span>steady_timer*<\/span> timer =<\/span> new<\/span> asio::<\/span>steady_timer<\/span>(<\/span>io)<\/span>;<\/span><\/p>\n

\/\/ \u8bbe\u7f6e\u7b2c\u4e00\u6b21\u7b49\u5f85<\/span>
\n timer-><\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
\n timer-><\/span>async_wait<\/span>(<\/span>
\n std::<\/span>bind<\/span>(<\/span>timer_callback1,<\/span> timer,<\/span> 0<\/span>)<\/span>
\n )<\/span>;<\/span>
\n}<\/span><\/p>\n

int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n asio::<\/span>io_context io;<\/span><\/p>\n

\/\/ \u542f\u52a8\u56de\u8c03\u5730\u72f1<\/span>
\n start_timer_sequence<\/span>(<\/span>io)<\/span>;<\/span><\/p>\n

io.<\/span>run<\/span>(<\/span>)<\/span>;<\/span>
\n return<\/span> 0<\/span>;<\/span>
\n}<\/span><\/p>\n

\u6b63\u5982\u4e0a\u9762\u7684\u4f8b\u5b50，\u6bcf\u4e2a\u5f02\u6b65\u64cd\u4f5c\u9700\u8981\u72ec\u7acb\u7684\u5904\u7406\u51fd\u6570，5\u6b21\u64cd\u4f5c\u9700\u89816\u4e2a\u51fd\u6570（5\u4e2a\u56de\u8c03+1\u4e2a\u542f\u52a8\u51fd\u6570），\u903b\u8f91\u4e0a\u6df1\u5c42\u5d4c\u5957：start \u2192 callback1 \u2192 callback2 \u2192 … \u2192 final，\u56de\u8c03\u51fd\u6570\u5f62\u6210\u94fe\u5f0f\u8c03\u7528，\u5982\u679c\u4e1a\u52a1\u5f88\u590d\u6742，\u4f60\u81ea\u5df1\u90fd\u4e0d\u77e5\u9053\u54ea\u4e00\u4e2a\u56de\u8c03\u8c03\u7528\u4e86\u54ea\u4e00\u4e2a，\u8fd9\u662f\u975e\u5e38\u4e0d\u53cb\u597d\u7684\u3002c++11\u540e\u6709\u4e86lambda\u8868\u8fbe\u5f0f\u8fd9\u4e2a\u60c5\u51b5\u6709\u6240\u597d\u8f6c，\u4f46lambda\u5d4c\u5957lambda\u770b\u7684\u8fd8\u662f\u5f88\u8d39\u52b2<\/p>\n

\u4e0a\u9762\u4ee3\u7801\u7528\u534f\u7a0b\u6765\u5b9e\u73b0\u5c31\u6bd4\u8f83\u7b80\u5355\u4e86：<\/p>\n

#<\/span>include<\/span> <boost\/asio.hpp><\/span><\/span>
\n#<\/span>include<\/span> <boost\/asio\/experimental\/awaitable_operators.hpp><\/span><\/span>
\n#<\/span>include<\/span> <iostream><\/span><\/span><\/p>\n

namespace<\/span> asio =<\/span> boost::<\/span>asio;<\/span><\/p>\n

\/\/ \u534f\u7a0b\u7248 – \u5355\u4e00\u51fd\u6570\u987a\u5e8f\u6267\u884c<\/span>
\nasio::<\/span>awaitable<<\/span>void<\/span>><\/span> sequential_operations<\/span>(<\/span>)<\/span> {<\/span>
\n asio::<\/span>steady_timer timer<\/span>(<\/span>co_await<\/span> asio::<\/span>this_coro::<\/span>executor)<\/span>;<\/span><\/p>\n

\/\/ \u64cd\u4f5c1<\/span>
\n std::<\/span>cout <<<\/span> "\u534f\u7a0b: \u542f\u52a8\u64cd\u4f5c1\\\\n"<\/span>;<\/span>
\n timer.<\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
\n co_await<\/span> timer.<\/span>async_wait<\/span>(<\/span>asio::<\/span>use_awaitable)<\/span>;<\/span>
\n std::<\/span>cout <<<\/span> "\u534f\u7a0b: \u64cd\u4f5c1\u5b8c\u6210 – 3\u79d2\u5df2\u8fc7\\\\n"<\/span>;<\/span><\/p>\n

\/\/ \u64cd\u4f5c2<\/span>
\n std::<\/span>cout <<<\/span> "\u534f\u7a0b: \u542f\u52a8\u64cd\u4f5c2\\\\n"<\/span>;<\/span>
\n timer.<\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
\n co_await<\/span> timer.<\/span>async_wait<\/span>(<\/span>asio::<\/span>use_awaitable)<\/span>;<\/span>
\n std::<\/span>cout <<<\/span> "\u534f\u7a0b: \u64cd\u4f5c2\u5b8c\u6210 – 3\u79d2\u5df2\u8fc7\\\\n"<\/span>;<\/span><\/p>\n

\/\/ \u64cd\u4f5c3<\/span>
\n std::<\/span>cout <<<\/span> "\u534f\u7a0b: \u542f\u52a8\u64cd\u4f5c3\\\\n"<\/span>;<\/span>
\n timer.<\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
\n co_await<\/span> timer.<\/span>async_wait<\/span>(<\/span>asio::<\/span>use_awaitable)<\/span>;<\/span>
\n std::<\/span>cout <<<\/span> "\u534f\u7a0b: \u64cd\u4f5c3\u5b8c\u6210 – 3\u79d2\u5df2\u8fc7\\\\n"<\/span>;<\/span><\/p>\n

\/\/ \u64cd\u4f5c4<\/span>
\n std::<\/span>cout <<<\/span> "\u534f\u7a0b: \u542f\u52a8\u64cd\u4f5c4\\\\n"<\/span>;<\/span>
\n timer.<\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
\n co_await<\/span> timer.<\/span>async_wait<\/span>(<\/span>asio::<\/span>use_awaitable)<\/span>;<\/span>
\n std::<\/span>cout <<<\/span> "\u534f\u7a0b: \u64cd\u4f5c4\u5b8c\u6210 – 3\u79d2\u5df2\u8fc7\\\\n"<\/span>;<\/span><\/p>\n

\/\/ \u64cd\u4f5c5<\/span>
\n std::<\/span>cout <<<\/span> "\u534f\u7a0b: \u542f\u52a8\u64cd\u4f5c5\\\\n"<\/span>;<\/span>
\n timer.<\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
\n co_await<\/span> timer.<\/span>async_wait<\/span>(<\/span>asio::<\/span>use_awaitable)<\/span>;<\/span>
\n std::<\/span>cout <<<\/span> "\u534f\u7a0b: \u64cd\u4f5c5\u5b8c\u6210 – 3\u79d2\u5df2\u8fc7\\\\n"<\/span>;<\/span><\/p>\n

std::<\/span>cout <<<\/span> "\u534f\u7a0b: \u6240\u6709\u64cd\u4f5c\u5b8c\u6210\\\\n"<\/span>;<\/span>
\n co_return<\/span>;<\/span>
\n}<\/span><\/p>\n

int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n asio::<\/span>io_context io;<\/span>
\n asio::<\/span>co_spawn<\/span>(<\/span>io,<\/span> sequential_operations<\/span>(<\/span>)<\/span>,<\/span> asio::<\/span>detached)<\/span>;<\/span>
\n io.<\/span>run<\/span>(<\/span>)<\/span>;<\/span>
\n return<\/span> 0<\/span>;<\/span>
\n}<\/span><\/p>\n

\u4f7f\u7528\u534f\u7a0b\u53ef\u4ee5\u8ba9\u6574\u4e2a\u5e8f\u5217\u5728\u4e00\u4e2a\u51fd\u6570\u4e2d\u5b9e\u73b0，\u6267\u884c\u6d41\u7a0b\u4e00\u76ee\u4e86\u7136，\u4ece\u4e0a\u5230\u4e0b\u987a\u5e8f\u6267\u884c，\u65e0\u5d4c\u5957，\u65e0\u8df3\u8f6c，\u8c03\u6574\u64cd\u4f5c\u987a\u5e8f\u53ea\u9700\u8c03\u6574\u4ee3\u7801\u987a\u5e8f，\u53e6\u5916，\u9519\u8bef\u5904\u7406\u4e0a，\u4e00\u4e2a try\/catch \u5757\u8986\u76d6\u6240\u6709\u64cd\u4f5c<\/p>\n

\u534f\u7a0b\u4e0e\u4f20\u7edf\u56de\u8c03\u5bf9\u6bd4<\/h3>\n\n\u7279\u6027\u534f\u7a0b\u56de\u8c03<\/tr>\n\n\n\n\n\n\n\n
\u4ee3\u7801\u7ed3\u6784<\/td>\n\u987a\u5e8f\u6267\u884c，\u7c7b\u4f3c\u540c\u6b65\u4ee3\u7801<\/td>\n\u5d4c\u5957\u56de\u8c03，\u5bb9\u6613\u5f62\u6210"\u56de\u8c03\u5730\u72f1"<\/td>\n<\/tr>\n
\u53ef\u8bfb\u6027<\/td>\n\u9ad8，\u903b\u8f91\u6e05\u6670<\/td>\n\u4f4e，\u8df3\u8f6c\u590d\u6742<\/td>\n<\/tr>\n
\u9519\u8bef\u5904\u7406<\/td>\n\u4f7f\u7528 try\/catch<\/td>\n\u9519\u8bef\u7801\u53c2\u6570<\/td>\n<\/tr>\n
\u5c40\u90e8\u53d8\u91cf<\/td>\n\u4fdd\u6301\u72b6\u6001<\/td>\n\u9700\u8981\u624b\u52a8\u4fdd\u6301\u72b6\u6001<\/td>\n<\/tr>\n
\u63a7\u5236\u6d41<\/td>\n\u6807\u51c6\u63a7\u5236\u7ed3\u6784<\/td>\n\u624b\u52a8\u72b6\u6001\u7ba1\u7406<\/td>\n<\/tr>\n
\u8d44\u6e90\u7ba1\u7406<\/td>\nRAII \u81ea\u7136\u9002\u7528<\/td>\n\u9700\u8981\u989d\u5916\u6ce8\u610f\u751f\u547d\u5468\u671f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Asio \u534f\u7a0b\u901a\u8fc7 C++20 \u6807\u51c6\u534f\u7a0b\u63d0\u4f9b\u4e86\u66f4\u7b80\u6d01\u3001\u66f4\u6613\u8bfb\u7684\u5f02\u6b65\u7f16\u7a0b\u6a21\u578b，\u540c\u65f6\u4fdd\u6301\u4e86\u9ad8\u6027\u80fd\u7279\u6027\u3002\u638c\u63e1 co_await \u548c co_spawn \u7b49\u5173\u952e\u673a\u5236，\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u7f51\u7edc\u5e94\u7528\u7684\u5f00\u53d1\u6548\u7387\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n

ASIO\u534f\u7a0b\u7684\u6838\u5fc3\u6982\u5ff5\u548c\u5173\u952e\u5b57<\/h2>\n

ASIO\u534f\u7a0b\u7684\u5173\u952e\u6982\u5ff5\u548c\u5173\u952e\u5b57\u5982\u4e0b：<\/p>\n

1. co_await<\/h3>\n
    \n
  • \n

    \u4f5c\u7528：\u6302\u8d77\u5f53\u524d\u534f\u7a0b，\u7b49\u5f85\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210<\/p>\n<\/li>\n

  • \n

    \u7528\u6cd5：\u4ee5asio\u7684\u8bfb\u53d6\u6570\u636e\u7684\u4f8b\u5b50\u4e3e\u4f8b，\u5f02\u6b65\u8bfb\u53d6\u7b49\u5230\u8bfb\u53d6\u5230\u6570\u636e\u540e\u7ee7\u7eed\u6267\u884c\u6570\u636e\u5904\u7406，\u4f20\u7edf\u7684\u56de\u8c03\u662f\u8fd9\u6837\u5b9e\u73b0\u7684：<\/p>\n<\/li>\n<\/ul>\n

    \/\/ \u8bfb\u53d6\u5b8c\u6210\u5904\u7406\u51fd\u6570<\/span>
    \nvoid<\/span> handle_read<\/span>(<\/span>boost::<\/span>system::<\/span>error_code ec,<\/span> size_t n,<\/span>
    \n std::<\/span>shared_ptr<<\/span>std::<\/span>array<<\/span>char<\/span>,<\/span> 1024<\/span>>><\/span> buffer)<\/span> {<\/span>
    \n if<\/span> (<\/span>!<\/span>ec)<\/span> {<\/span>
    \n std::<\/span>cout <<<\/span> "\u8bfb\u53d6\u5230 "<\/span> <<<\/span> n <<<\/span> " \u5b57\u8282\u6570\u636e\\\\n"<\/span>;<\/span>
    \n }<\/span> else<\/span> {<\/span>
    \n std::<\/span>cerr <<<\/span> "\u8bfb\u53d6\u9519\u8bef: "<\/span> <<<\/span> ec.<\/span>message<\/span>(<\/span>)<\/span> <<<\/span> "\\\\n"<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \/\/ \u542f\u52a8\u8bfb\u53d6\u64cd\u4f5c<\/span>
    \nvoid<\/span> start_read<\/span>(<\/span>tcp::<\/span>socket&<\/span> socket)<\/span> {<\/span>
    \n \/\/ \u4f7f\u7528 shared_ptr \u7ba1\u7406\u7f13\u51b2\u533a<\/span>
    \n auto<\/span> buffer =<\/span> std::<\/span>make_shared<<\/span>std::<\/span>array<<\/span>char<\/span>,<\/span> 1024<\/span>>><\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    socket.<\/span>async_read_some<\/span>(<\/span>
    \n asio::<\/span>buffer<\/span>(<\/span>*<\/span>buffer)<\/span>,<\/span>
    \n std::<\/span>bind<\/span>(<\/span>handle_read,<\/span> std::<\/span>placeholders::<\/span>_1,<\/span> std::<\/span>placeholders::<\/span>_2,<\/span> buffer)<\/span>
    \n )<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u4f7f\u7528\u534f\u7a0b\u662f\u8fd9\u6837\u5b9e\u73b0\u7684<\/p>\n

    asio::<\/span>awaitable<<\/span>void<\/span>><\/span> read_data<\/span>(<\/span>tcp::<\/span>socket&<\/span> socket)<\/span> {<\/span>
    \n char<\/span> data[<\/span>1024<\/span>]<\/span>;<\/span>
    \n \/\/ \u4f7f\u7528 co_await \u7b49\u5f85\u5f02\u6b65\u8bfb\u53d6<\/span>
    \n size_t n =<\/span> co_await<\/span> socket.<\/span>async_read_some<\/span>(<\/span>
    \n asio::<\/span>buffer<\/span>(<\/span>data)<\/span>,<\/span>
    \n asio::<\/span>use_awaitable
    \n )<\/span>;<\/span>
    \n std::<\/span>cout <<<\/span> "\u8bfb\u53d6\u5230 "<\/span> <<<\/span> n <<<\/span> " \u5b57\u8282\u6570\u636e\\\\n"<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u534f\u7a0b\u76f4\u63a5"\u7b49\u5f85"\u64cd\u4f5c\u5b8c\u6210，\u4ee3\u7801\u7ebf\u6027\u6267\u884c，\u4ece\u8fd9\u4e2a\u4f8b\u5b50\u4e5f\u770b\u5230\u534f\u7a0b\u7684\u53e6\u5916\u4e00\u4e2a\u597d\u5904，\u5c31\u662f\u53ef\u4ee5\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf\u6765\u7ba1\u7406\u7f13\u51b2\u533a，\u56e0\u4e3a\u4ece\u8bed\u6cd5\u4e0a\u770b，\u534f\u7a0b\u5b83\u662f\u5728\u4e00\u4e2a\u51fd\u6570\u91cc\u6267\u884c，\u7f13\u51b2\u533a\u751f\u547d\u5468\u671f\u4e0d\u4f1a\u91ca\u653e，\u800c\u56de\u8c03\u4f60\u53ea\u80fd\u7528\u6210\u5458\u53d8\u91cf\u6216\u8005\u5806\u5206\u914d\u7a7a\u95f4\u4e86，\u5f53\u7136，\u4f60\u7528lambda\u8868\u8fbe\u5f0f\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u7c7b\u578b\u6548\u679c<\/p>\n

    2. co_return\u548casio::awaitable<\/h3>\n
      \n
    • \u4f5c\u7528：co_return\u7c7b\u4f3creturn\u7ed3\u675f\u534f\u7a0b\u6267\u884c\u5e76\u8fd4\u56de\u503c，\u8fd9\u4e2a\u8fd4\u56de\u503c\u5b9e\u9645\u662fasio::awaitable<\/li>\n<\/ul>\n

      \/\/\u8fd9\u91ccT\u662fresult\u5bf9\u5e94\u7c7b\u578b<\/span>
      \nasio::<\/span>awaitable<<\/span>T><\/span> calculate_value<\/span>(<\/span>)<\/span> {<\/span>
      \n co_return<\/span> result;<\/span> \/\/ \u5bf9\u4e8e\u6709\u8fd4\u56de\u503c\u7684\u534f\u7a0b<\/span>
      \n}<\/span><\/p>\n

      asio::<\/span>awaitable<<\/span>void<\/span>><\/span> do_something<\/span>(<\/span>)<\/span> {<\/span>
      \n co_return<\/span>;<\/span> \/\/ \u5bf9\u4e8e void \u534f\u7a0b<\/span>
      \n}<\/span><\/p>\n

      \u4e0b\u9762\u4e3e\u4f8b\u4e00\u4e2a\u5177\u4f53\u7684\u4f8b\u5b50<\/p>\n

      \/\/calculate_value\u51fd\u6570\u5c06\u5ef6\u65f61\u79d2\u540e\u8fd4\u56de42<\/span>
      \nasio::<\/span>awaitable<<\/span>int<\/span>><\/span> calculate_value<\/span>(<\/span>)<\/span> {<\/span>
      \n asio::<\/span>steady_timer timer<\/span>(<\/span>co_await<\/span> asio::<\/span>this_coro::<\/span>executor)<\/span>;<\/span>
      \n timer.<\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>1<\/span>)<\/span>)<\/span>;<\/span>
      \n co_await<\/span> timer.<\/span>async_wait<\/span>(<\/span>asio::<\/span>use_awaitable)<\/span>;<\/span><\/p>\n

      \/\/ \u4f7f\u7528 co_return \u8fd4\u56de\u503c<\/span>
      \n co_return<\/span> 42<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u534f\u7a0b\u76f4\u63a5\u8fd4\u56de\u7ed3\u679c，\u7c7b\u4f3c\u540c\u6b65\u51fd\u6570,co_return\u642d\u914dasio::awaitable\u4f7f\u7528<\/p>\n

      3. asio::use_awaitable<\/h3>\n
        \n
      • \u4f5c\u7528：\u5c06\u5f02\u6b65\u64cd\u4f5c\u8f6c\u6362\u4e3a\u53ef\u7b49\u5f85\u5bf9\u8c61，\u8fd9\u4e2a\u4f5c\u7528\u662f\u544a\u8bc9asio\u7684\u51fd\u6570\u8fd9\u662f\u4e00\u4e2a\u534f\u7a0b\u51fd\u6570，\u662f\u4e3a\u4e86\u548c\u5f02\u6b65\u51fd\u6570\u80fd\u8fdb\u884c\u91cd\u8f7d\u533a\u5206\u7528\u7684，\u8fd9\u4e2a\u6807\u5fd7\u80fd\u8ba9asio\u7684\u534f\u7a0b\u51fd\u6570\u548c\u5f02\u6b65\u56de\u8c03\u51fd\u6570\u90fd\u4e00\u6837，\u4ec5\u4ec5\u662f\u4f20\u5165\u7684\u53c2\u6570\u4e0d\u540c<\/li>\n<\/ul>\n

        \/\/\u534f\u7a0b\u7248\u672c<\/span>
        \nasio::<\/span>awaitable<<\/span>void<\/span>><\/span> wait_for_timer<\/span>(<\/span>)<\/span> {<\/span>
        \nasio::<\/span>steady_timer timer<\/span>(<\/span>co_await<\/span> asio::<\/span>this_coro::<\/span>executor)<\/span>;<\/span><\/p>\n

        \/\/ \u4f7f\u7528 use_awaitable \u4f7f\u5f02\u6b65\u64cd\u4f5c\u53ef\u7b49\u5f85<\/span>
        \ntimer.<\/span>expires_after<\/span>(<\/span>std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>1<\/span>)<\/span>)<\/span>;<\/span>
        \nco_await<\/span> timer.<\/span>async_wait<\/span>(<\/span>asio::<\/span>use_awaitable)<\/span>;<\/span><\/p>\n

        std::<\/span>cout <<<\/span> "\u5b9a\u65f6\u5668\u5b8c\u6210\\\\n"<\/span>;<\/span>
        \n}<\/span><\/p>\n

        \/\/\u56de\u8c03\u7248\u672c<\/span>
        \nvoid<\/span> wait_for_timer<\/span>(<\/span>asio::<\/span>io_context&<\/span> io)<\/span> {<\/span>
        \n auto<\/span> timer =<\/span> std::<\/span>make_shared<<\/span>asio::<\/span>steady_timer><\/span>(<\/span>io,<\/span> std::<\/span>chrono::<\/span>seconds<\/span>(<\/span>1<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

        timer-><\/span>async_wait<\/span>(<\/span>
        \n [<\/span>]<\/span>(<\/span>const<\/span> asio::<\/span>error_code&<\/span> ec)<\/span> {<\/span>
        \n if<\/span> (<\/span>!<\/span>ec)<\/span> {<\/span>
        \n std::<\/span>cout <<<\/span> "\u5b9a\u65f6\u5668\u5b8c\u6210\\\\n"<\/span>;<\/span>
        \n }<\/span> else<\/span> {<\/span>
        \n std::<\/span>cerr <<<\/span> "\u5b9a\u65f6\u5668\u9519\u8bef: "<\/span> <<<\/span> ec.<\/span>message<\/span>(<\/span>)<\/span> <<<\/span> "\\\\n"<\/span>;<\/span>
        \n }<\/span>
        \n }<\/span>
        \n )<\/span>;<\/span>
        \n}<\/span><\/p>\n

        4. \u542f\u52a8\u534f\u7a0b (co_spawn)<\/h3>\n
          \n
        • \u4f5c\u7528：co_spawn\u7684\u4f5c\u7528\u662f\u542f\u52a8\u4e00\u4e2a\u534f\u7a0b<\/li>\n<\/ul>\n

          asio::<\/span>co_spawn<\/span>(<\/span>
          \n executor,<\/span> \/\/ \u6267\u884c\u4e0a\u4e0b\u6587 (io_context\/strand)<\/span>
          \n coroutine_function,<\/span> \/\/ \u534f\u7a0b\u51fd\u6570<\/span>
          \n completion_handler \/\/ \u5b8c\u6210\u56de\u8c03<\/span>
          \n)<\/span>;<\/span><\/p>\n

          completion_handler\u662f\u5b8c\u6210\u5904\u7406\u7a0b\u5e8f\u9009\u9879\u6709\u4e24\u79cd：<\/p>\n

            \n
          • asio::detached: \u4e0d\u5173\u5fc3\u534f\u7a0b\u7ed3\u675f（\u6700\u5e38\u7528）<\/li>\n<\/ul>\n

            asio::<\/span>co_spawn<\/span>(<\/span>executor,<\/span> session<\/span>(<\/span>std::<\/span>move<\/span>(<\/span>socket)<\/span>)<\/span>,<\/span> asio::<\/span>detached)<\/span>;<\/span><\/p>\n

              \n
            • \u81ea\u5b9a\u4e49\u5904\u7406：<\/li>\n<\/ul>\n

              asio::<\/span>co_spawn<\/span>(<\/span>executor,<\/span> session<\/span>(<\/span>)<\/span>,<\/span>
              \n [<\/span>]<\/span>(<\/span>std::<\/span>exception_ptr e,<\/span> int<\/span> result)<\/span> {<\/span>
              \n if<\/span> (<\/span>e)<\/span> std::<\/span>rethrow_exception<\/span>(<\/span>e)<\/span>;<\/span>
              \n std::<\/span>cout <<<\/span> "Result: "<\/span> <<<\/span> result <<<\/span> "\\\\n"<\/span>;<\/span>
              \n }<\/span>)<\/span>;<\/span><\/p>\n

              \u8fd9\u91cc\u7528ASIO\u56de\u8c03\u65b9\u5f0f\u5199\u4e00\u4e2a\u6700\u7b80\u5355\u7684tcp\u670d\u52a1\u5668\u662f\u8fd9\u6837\u7684：<\/p>\n

              \/\/ \u4f1a\u8bdd\u72b6\u6001\u7ba1\u7406\u7c7b<\/span>
              \nclass<\/span> Session<\/span> :<\/span> public<\/span> std::<\/span>enable_shared_from_this<\/span><<\/span>Session<\/span>><\/span><\/span> {<\/span>
              \npublic<\/span>:<\/span>
              \n Session<\/span>(<\/span>tcp::<\/span>socket socket)<\/span> :<\/span> socket_<\/span>(<\/span>std::<\/span>move<\/span>(<\/span>socket)<\/span>)<\/span> {<\/span>}<\/span><\/p>\n

              void<\/span> start<\/span>(<\/span>)<\/span> {<\/span>
              \n start_read<\/span>(<\/span>)<\/span>;<\/span>
              \n }<\/span><\/p>\n

              void<\/span> start_read<\/span>(<\/span>)<\/span> {<\/span>
              \n auto<\/span> self =<\/span> shared_from_this<\/span>(<\/span>)<\/span>;<\/span>
              \n auto<\/span> buffer =<\/span> std::<\/span>make_shared<<\/span>std::<\/span>array<<\/span>char<\/span>,<\/span> 1024<\/span>>><\/span>(<\/span>)<\/span>;<\/span><\/p>\n

              socket_.<\/span>async_read_some<\/span>(<\/span>
              \n asio::<\/span>buffer<\/span>(<\/span>*<\/span>buffer)<\/span>,<\/span>
              \n std::<\/span>bind<\/span>(<\/span>&<\/span>Session::<\/span>handle_read,<\/span> this<\/span>,<\/span> std::<\/span>placeholders::<\/span>_1,<\/span> std::<\/span>placeholders::<\/span>_2,<\/span> buffer)<\/span>
              \n )<\/span>;<\/span>
              \n }<\/span><\/p>\n

              void<\/span> handle_read<\/span>(<\/span>boost::<\/span>system::<\/span>error_code ec,<\/span> size_t n,<\/span>
              \n std::<\/span>shared_ptr<<\/span>std::<\/span>array<<\/span>char<\/span>,<\/span> 1024<\/span>>><\/span> buffer)<\/span> {<\/span>
              \n if<\/span> (<\/span>!<\/span>ec)<\/span> {<\/span>
              \n \/\/ \u5904\u7406\u6570\u636e…<\/span>
              \n start_read<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u7ee7\u7eed\u8bfb\u53d6<\/span>
              \n }<\/span>
              \n }<\/span><\/p>\n

              private<\/span>:<\/span>
              \n tcp::<\/span>socket socket_;<\/span>
              \n}<\/span>;<\/span><\/p>\n

              int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
              \n asio::<\/span>io_context io;<\/span>
              \n tcp::<\/span>socket socket<\/span>(<\/span>io)<\/span>;<\/span><\/p>\n

              \/\/ \u521b\u5efa\u4f1a\u8bdd\u5e76\u542f\u52a8<\/span>
              \n auto<\/span> session =<\/span> std::<\/span>make_shared<<\/span>Session><\/span>(<\/span>std::<\/span>move<\/span>(<\/span>socket)<\/span>)<\/span>;<\/span>
              \n session-><\/span>start<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

              io.<\/span>run<\/span>(<\/span>)<\/span>;<\/span>
              \n}<\/span><\/p>\n

              \u7528\u534f\u7a0b\u53ef\u4ee5\u53d8\u4e3a\u8fd9\u6837：<\/p>\n

              int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
              \n asio::<\/span>io_context io;<\/span>
              \n tcp::<\/span>socket socket<\/span>(<\/span>io)<\/span>;<\/span><\/p>\n

              \/\/ \u4f7f\u7528 co_spawn \u542f\u52a8\u534f\u7a0b<\/span>
              \n asio::<\/span>co_spawn<\/span>(<\/span>io,<\/span> session<\/span>(<\/span>std::<\/span>move<\/span>(<\/span>socket)<\/span>)<\/span>,<\/span> asio::<\/span>detached)<\/span>;<\/span><\/p>\n

              io.<\/span>run<\/span>(<\/span>)<\/span>;<\/span>
              \n}<\/span><\/p>\n

              \/\/ \u534f\u7a0b\u51fd\u6570<\/span>
              \nasio::<\/span>awaitable<<\/span>void<\/span>><\/span> session<\/span>(<\/span>tcp::<\/span>socket socket)<\/span> {<\/span>
              \n \/\/ …\u534f\u7a0b\u903b\u8f91…<\/span>
              \n co_return<\/span>;<\/span>
              \n}<\/span><\/p>\n

              asio::co_spawn\u542f\u7528\u4e00\u4e2a\u534f\u7a0b\u8fdb\u5165session\u51fd\u6570，\u7136\u540e\u7b49\u5f85\u5176\u5b8c\u6210\u3002<\/p>\n

              \u4e0a\u9762\u4f8b\u5b50\u4e2dasio::detached\u8bf4\u660e\u542f\u52a8\u8fd9\u4e2a\u534f\u7a0b\u540e\u5c31\u4e0d\u7ba1\u4ed6\u7684\u8fd4\u56de\u4e86，\u5982\u679c\u4f60\u8981\u83b7\u53d6\u8fd4\u56de，\u53ef\u4ee5\u4f20\u5165\u4e00\u4e2a\u56de\u8c03（\u534f\u7a0b\u6700\u7ec8\u8fd8\u662f\u4e0d\u80fd\u5b8c\u5168\u907f\u514d\u56de\u8c03）,\u4f8b\u5982：<\/p>\n

              \/\/ \u5b8c\u6210\u5904\u7406\u51fd\u6570<\/span>
              \nvoid<\/span> handle_completion<\/span>(<\/span>std::<\/span>exception_ptr e,<\/span> int<\/span> result)<\/span> {<\/span>
              \n if<\/span> (<\/span>e)<\/span> {<\/span>
              \n try<\/span> {<\/span>
              \n std::<\/span>rethrow_exception<\/span>(<\/span>e)<\/span>;<\/span>
              \n }<\/span> catch<\/span> (<\/span>const<\/span> std::<\/span>exception&<\/span> ex)<\/span> {<\/span>
              \n std::<\/span>cerr <<<\/span> "\u8ba1\u7b97\u9519\u8bef: "<\/span> <<<\/span> ex.<\/span>what<\/span>(<\/span>)<\/span> <<<\/span> "\\\\n"<\/span>;<\/span>
              \n }<\/span>
              \n }<\/span> else<\/span> {<\/span>
              \n std::<\/span>cout <<<\/span> "\u8ba1\u7b97\u7ed3\u679c: "<\/span> <<<\/span> result <<<\/span> "\\\\n"<\/span>;<\/span>
              \n }<\/span>
              \n}<\/span><\/p>\n

              \/\/ \u53ef\u80fd\u5931\u8d25\u7684\u534f\u7a0b<\/span>
              \nasio::<\/span>awaitable<<\/span>int<\/span>><\/span> compute_value<\/span>(<\/span>)<\/span> {<\/span>
              \n \/\/ …\u53ef\u80fd\u629b\u51fa\u5f02\u5e38\u7684\u8ba1\u7b97…<\/span>
              \n co_return<\/span> 42<\/span>;<\/span>
              \n}<\/span><\/p>\n

              int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
              \n asio::<\/span>io_context io;<\/span><\/p>\n

              \/\/ \u542f\u52a8\u534f\u7a0b\u5e76\u6307\u5b9a\u5b8c\u6210\u5904\u7406\u51fd\u6570<\/span>
              \n asio::<\/span>co_spawn<\/span>(<\/span>io,<\/span> compute_value<\/span>(<\/span>)<\/span>,<\/span> handle_completion)<\/span>;<\/span><\/p>\n

              io.<\/span>run<\/span>(<\/span>)<\/span>;<\/span>
              \n}<\/span><\/p>\n

              ASIO\u534f\u7a0b\u7684\u5176\u5b83\u64cd\u4f5c<\/h2>\n

              1. \u5207\u6362\u6267\u884c\u4e0a\u4e0b\u6587<\/h3>\n

              asio::dispatch：\u534f\u7a0b\u6267\u884c\u4e0a\u4e0b\u6587\u5207\u6362，\u5b83\u5141\u8bb8\u5f00\u53d1\u8005\u7cbe\u786e\u63a7\u5236\u534f\u7a0b\u5728\u54ea\u4e2a\u7ebf\u7a0b\u6216\u6267\u884c\u5668\u4e0a\u8fd0\u884c<\/p>\n

              \/\/ \u5207\u6362\u5230\u6307\u5b9a\u7ebf\u7a0b\u7684 io_context<\/span>
              \nco_await<\/span> asio::<\/span>dispatch<\/span>(<\/span>target_io_context,<\/span> asio::<\/span>use_awaitable)<\/span>;<\/span><\/p>\n

              \u5f53\u534f\u7a0b\u6267\u884c\u5230co_await asio::dispatch(…)\u65f6：<\/p>\n

                \n
              • \u6302\u8d77\u5f53\u524d\u534f\u7a0b：\u6682\u505c\u5f53\u524d\u6267\u884c\u6d41\u7a0b<\/li>\n
              • \u8c03\u5ea6\u5230\u76ee\u6807\u6267\u884c\u5668：\u5c06\u534f\u7a0b\u7eed\u4f53（continuation）\u63d0\u4ea4\u5230\u76ee\u6807\u6267\u884c\u5668\u7684\u961f\u5217<\/li>\n
              • \u5728\u76ee\u6807\u4e0a\u4e0b\u6587\u6062\u590d：\u5f53\u76ee\u6807\u6267\u884c\u5668\u8c03\u5ea6\u8be5\u4efb\u52a1\u65f6，\u534f\u7a0b\u5728\u76ee\u6807\u7ebf\u7a0b\u6062\u590d\u6267\u884c<\/li>\n<\/ul>\n

                \u4f8b\u5982：\u7f51\u7edc\u8bf7\u6c42\u540e，\u6709\u4e9b\u590d\u6742\u8ba1\u7b97\u5207\u6362\u5230\u522b\u7684\u7ebf\u7a0b\u8fdb\u884c\u64cd\u4f5c：<\/p>\n

                asio::<\/span>awaitable<<\/span>void<\/span>><\/span> process_request<\/span>(<\/span>)<\/span> {<\/span>
                \n \/\/ \u5728\u7f51\u7edc\u7ebf\u7a0b\u6c60\u5904\u7406\u8bf7\u6c42<\/span>
                \n Request req =<\/span> co_await<\/span> receive_request<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                \/\/ \u5207\u6362\u5230\u8ba1\u7b97\u7ebf\u7a0b\u6c60\u5904\u7406CPU\u5bc6\u96c6\u578b\u4efb\u52a1<\/span>
                \n co_await<\/span> asio::<\/span>dispatch<\/span>(<\/span>compute_pool,<\/span> asio::<\/span>use_awaitable)<\/span>;<\/span>
                \n Result res =<\/span> co_await<\/span> heavy_computation<\/span>(<\/span>req)<\/span>;<\/span><\/p>\n

                \/\/ \u5207\u56de\u7f51\u7edc\u7ebf\u7a0b\u6c60\u53d1\u9001\u54cd\u5e94<\/span>
                \n co_await<\/span> asio::<\/span>dispatch<\/span>(<\/span>network_pool,<\/span> asio::<\/span>use_awaitable)<\/span>;<\/span>
                \n co_await<\/span> send_response<\/span>(<\/span>res)<\/span>;<\/span>
                \n}<\/span><\/p>\n

                \u8fd8\u6709\u5c31\u662f\u7ebf\u7a0b\u548cGUI\u7684\u5207\u6362,GUI\u7ebf\u7a0b\u4e00\u822c\u4e0d\u4f1a\u548c\u7f51\u7edc\u8bf7\u6c42\u5728\u4e00\u4e2a\u7ebf\u7a0b\u4e2d<\/p>\n

                asio::<\/span>awaitable<<\/span>void<\/span>><\/span> update_ui<\/span>(<\/span>)<\/span> {<\/span>
                \n Data data =<\/span> co_await<\/span> fetch_data<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                \/\/ \u5207\u6362\u5230GUI\u7ebf\u7a0b\u66f4\u65b0\u754c\u9762<\/span>
                \n co_await<\/span> asio::<\/span>dispatch<\/span>(<\/span>gui_executor,<\/span> asio::<\/span>use_awaitable)<\/span>;<\/span>
                \n ui_label.<\/span>set_text<\/span>(<\/span>data.<\/span>message)<\/span>;<\/span>
                \n ui_chart.<\/span>update<\/span>(<\/span>data.<\/span>values)<\/span>;<\/span>
                \n}<\/span><\/p>\n

                2. \u534f\u7a0b\u53d6\u6d88<\/h3>\n

                asio::<\/span>cancellation_signal cancel_signal;<\/span><\/p>\n

                \/\/ \u542f\u52a8\u53ef\u53d6\u6d88\u534f\u7a0b<\/span>
                \nasio::<\/span>co_spawn<\/span>(<\/span>executor,<\/span>
                \n [<\/span>]<\/span>(<\/span>asio::<\/span>cancellation_signal sig)<\/span> -><\/span> asio::<\/span>awaitable<<\/span>void<\/span>><\/span> {<\/span>
                \n asio::<\/span>steady_timer timer<\/span>(<\/span>co_await<\/span> asio::<\/span>this_coro::<\/span>executor)<\/span>;<\/span>
                \n timer.<\/span>expires_after<\/span>(<\/span>10<\/span>s)<\/span>;<\/span><\/p>\n

                \/\/ \u7ed1\u5b9a\u53d6\u6d88\u4fe1\u53f7<\/span>
                \n co_await<\/span> timer.<\/span>async_wait<\/span>(<\/span>
                \n asio::<\/span>bind_cancellation_slot<\/span>(<\/span>sig.<\/span>slot<\/span>(<\/span>)<\/span>,<\/span> asio::<\/span>use_awaitable)<\/span>)<\/span>;<\/span>
                \n }<\/span>(<\/span>cancel_signal)<\/span>,<\/span>
                \n asio::<\/span>detached
                \n)<\/span>;<\/span><\/p>\n

                \/\/ \u5728\u9700\u8981\u65f6\u53d6\u6d88<\/span>
                \ncancel_signal.<\/span>emit<\/span>(<\/span>asio::<\/span>cancellation_type::<\/span>all)<\/span>;<\/span><\/p>\n

                \u534f\u7a0b\u64cd\u4f5c\u7b26<\/h2>\n

                \u534f\u7a0b\u64cd\u4f5c\u7b26\u4e3b\u8981\u662f||\u548c&&，\u5141\u8bb8\u591a\u4e2a\u534f\u7a0b\u540c\u65f6\u8fd0\u884c，\u5e76\u7b49\u5f85\u6240\u6709(&&)\u6216\u8005\u67d0\u4e2a(||)\u534f\u7a0b\u5b8c\u6210\u3002<\/p>\n

                1.||\u64cd\u4f5c\u7b26<\/h3>\n

                \u4e0b\u9762\u4e3e\u4e2a\u7f51\u7edc\u7f16\u7a0b\u4e2d\u6700\u5e38\u89c1\u7684\u573a\u666f\u4e4b\u4e00"\u5e26\u8d85\u65f6\u7684\u5f02\u6b65\u8bfb\u53d6"\u6765\u5c55\u793a\u534f\u7a0b\u7684\u64cd\u4f5c\u7b26，\u7f51\u7edc\u7f16\u7a0b\u7ecf\u5e38\u6709\u4e00\u4e2a\u9700\u6c42，\u5c31\u662f\u4f60\u7ed9\u5bf9\u65b9\u5199\u4e00\u4e2a\u6570\u636e，\u8981n\u79d2\u5185\u7b49\u5f85\u5bf9\u65b9\u56de\u590d，\u5982\u679c\u5bf9\u65b9n\u79d2\u5185\u4e0d\u56de\u590d，\u4f60\u8981\u91cd\u53d1，\u6700\u591a\u91cd\u53d1m\u6b21，\u8fd9\u4e2a\u903b\u8f91\u68b3\u7406\u4e3a：<\/p>\n

                  \n
                • \u5411\u5bf9\u65b9\u53d1\u9001\u8bf7\u6c42\u6570\u636e<\/li>\n
                • \u7b49\u5f85\u56de\u590d，\u8bbe\u7f6e\u8d85\u65f6\u65f6\u95f4（\u59823\u79d2）<\/li>\n
                • \u5982\u679c\u8d85\u65f6\u672a\u6536\u5230\u56de\u590d，\u91cd\u53d1\u8bf7\u6c42<\/li>\n
                • \u6700\u591a\u91cd\u53d1M\u6b21（\u59823\u6b21）<\/li>\n<\/ul>\n

                  \u7528\u534f\u7a0b\u8fd9\u6837\u5b9e\u73b0\u7684(\u6ce8\u610f，\u8fd9\u91cc\u534f\u7a0b\u7684||\u64cd\u4f5c\u7b26\u8981include asio\/experimental\/awaitable_operators.hpp)：<\/p>\n

                  #<\/span>include<\/span> <boost\/asio.hpp><\/span><\/span>
                  \n#<\/span>include<\/span> <boost\/asio\/experimental\/awaitable_operators.hpp><\/span><\/span>
                  \n#<\/span>include<\/span> <iostream><\/span><\/span>
                  \n#<\/span>include<\/span> <system_error><\/span><\/span>
                  \n#<\/span>include<\/span> <chrono><\/span><\/span><\/p>\n

                  namespace<\/span> asio =<\/span> boost::<\/span>asio;<\/span>
                  \nusing<\/span> asio::<\/span>ip::<\/span>tcp;<\/span>
                  \nusing<\/span> namespace<\/span> asio::<\/span>experimental::<\/span>awaitable_operators;<\/span>
                  \nnamespace<\/span> chrono =<\/span> std::<\/span>chrono;<\/span><\/p>\n

                  \/\/ \u5e26\u8d85\u65f6\u91cd\u53d1\u7684\u53ef\u9760\u8bf7\u6c42<\/span>
                  \nasio::<\/span>awaitable<<\/span>bool<\/span>><\/span> reliable_request<\/span>(<\/span>
                  \n tcp::<\/span>socket&<\/span> socket,<\/span>
                  \n const<\/span> std::<\/span>string&<\/span> request,<\/span>
                  \n int<\/span> max_retries =<\/span> 3<\/span>,<\/span>
                  \n chrono::<\/span>seconds timeout =<\/span> 3<\/span>s)<\/span>
                  \n{<\/span>
                  \n int<\/span> attempt =<\/span> 0<\/span>;<\/span><\/p>\n

                  while<\/span> (<\/span>attempt <=<\/span> max_retries)<\/span> {<\/span>
                  \n attempt++<\/span>;<\/span>
                  \n std::<\/span>cout <<<\/span> "\u5c1d\u8bd5 #"<\/span> <<<\/span> attempt <<<\/span> "\/"<\/span> <<<\/span> max_retries <<<\/span> "\\\\n"<\/span>;<\/span><\/p>\n

                  try<\/span> {<\/span>
                  \n \/\/ \u53d1\u9001\u8bf7\u6c42<\/span>
                  \n co_await<\/span> asio::<\/span>async_write<\/span>(<\/span>
                  \n socket,<\/span> asio::<\/span>buffer<\/span>(<\/span>request)<\/span>,<\/span> asio::<\/span>use_awaitable)<\/span>;<\/span><\/p>\n

                  \/\/ \u51c6\u5907\u63a5\u6536\u54cd\u5e94<\/span>
                  \n std::<\/span>string response;<\/span>
                  \n response.<\/span>resize<\/span>(<\/span>1024<\/span>)<\/span>;<\/span><\/p>\n

                  \/\/ \u8bbe\u7f6e\u5b9a\u65f6\u5668<\/span>
                  \n asio::<\/span>steady_timer timer<\/span>(<\/span>co_await<\/span> asio::<\/span>this_coro::<\/span>executor)<\/span>;<\/span>
                  \n timer.<\/span>expires_after<\/span>(<\/span>timeout)<\/span>;<\/span><\/p>\n

                  \/\/ \u540c\u65f6\u7b49\u5f85\u8bfb\u53d6\u548c\u8d85\u65f6,\u8fd9\u91cc\u6f14\u793a\u4e86||\u64cd\u4f5c\u7b26，\u8fd9\u91cc\u9762\u6709\u4e24\u4e2a\u534f\u7a0b\u51fd\u6570<\/span>
                  \n auto<\/span> result =<\/span> co_await<\/span> (<\/span>
                  \n socket.<\/span>async_read_some<\/span>(<\/span>asio::<\/span>buffer<\/span>(<\/span>response)<\/span>,<\/span> asio::<\/span>use_awaitable)<\/span> ||<\/span>
                  \n timer.<\/span>async_wait<\/span>(<\/span>asio::<\/span>use_awaitable)<\/span>
                  \n )<\/span>;<\/span>
                  \n \/\/\u53ea\u8981\u4e0a\u9762\u6709\u4e00\u4e2a\u8fd4\u56de\u7ed3\u679c\u5c31\u4f1a\u5f80\u4e0b\u6267\u884c<\/span>
                  \n \/\/ \u5904\u7406\u7ed3\u679c<\/span>
                  \n if<\/span> (<\/span>result.<\/span>index<\/span>(<\/span>)<\/span> ==<\/span> 0<\/span>)<\/span> {<\/span> \/\/ \u6536\u5230\u54cd\u5e94<\/span>
                  \n size_t bytes_read =<\/span> std::<\/span>get<<\/span>0<\/span>><\/span>(<\/span>result)<\/span>.<\/span>first;<\/span>
                  \n response.<\/span>resize<\/span>(<\/span>bytes_read)<\/span>;<\/span>
                  \n std::<\/span>cout <<<\/span> "\u6536\u5230\u54cd\u5e94: "<\/span> <<<\/span> response <<<\/span> "\\\\n"<\/span>;<\/span>
                  \n co_return<\/span> true<\/span>;<\/span>
                  \n }<\/span>
                  \n else<\/span> {<\/span> \/\/ \u8d85\u65f6<\/span>
                  \n std::<\/span>cout <<<\/span> "\u8bf7\u6c42\u8d85\u65f6, "<\/span>;<\/span>
                  \n if<\/span> (<\/span>attempt <<\/span> max_retries)<\/span> {<\/span>
                  \n std::<\/span>cout <<<\/span> "\u51c6\u5907\u91cd\u8bd5…\\\\n"<\/span>;<\/span>
                  \n }<\/span> else<\/span> {<\/span>
                  \n std::<\/span>cout <<<\/span> "\u5df2\u8fbe\u6700\u5927\u91cd\u8bd5\u6b21\u6570\\\\n"<\/span>;<\/span>
                  \n }<\/span>
                  \n }<\/span>
                  \n }<\/span>
                  \n catch<\/span> (<\/span>const<\/span> std::<\/span>exception&<\/span> e)<\/span> {<\/span>
                  \n std::<\/span>cerr <<<\/span> "\u9519\u8bef: "<\/span> <<<\/span> e.<\/span>what<\/span>(<\/span>)<\/span> <<<\/span> "\\\\n"<\/span>;<\/span>
                  \n co_return<\/span> false<\/span>;<\/span>
                  \n }<\/span>
                  \n }<\/span><\/p>\n

                  co_return<\/span> false<\/span>;<\/span> \/\/ \u6240\u6709\u5c1d\u8bd5\u5931\u8d25<\/span>
                  \n}<\/span><\/p>\n

                  \/\/ \u793a\u4f8b\u4f7f\u7528<\/span>
                  \nasio::<\/span>awaitable<<\/span>void<\/span>><\/span> client_session<\/span>(<\/span>tcp::<\/span>socket socket)<\/span> {<\/span>
                  \n try<\/span> {<\/span>
                  \n \/\/ \u6784\u9020\u8bf7\u6c42\u6570\u636e<\/span>
                  \n std::<\/span>string request =<\/span> "QUERY_DATA"<\/span>;<\/span><\/p>\n

                  \/\/ \u53d1\u9001\u53ef\u9760\u8bf7\u6c42（\u6700\u591a\u91cd\u8bd53\u6b21，\u8d85\u65f63\u79d2）<\/span>
                  \n bool<\/span> success =<\/span> co_await<\/span> reliable_request<\/span>(<\/span>socket,<\/span> request,<\/span> 3<\/span>,<\/span> 3<\/span>s)<\/span>;<\/span><\/p>\n

                  if<\/span> (<\/span>success)<\/span> {<\/span>
                  \n std::<\/span>cout <<<\/span> "\u8bf7\u6c42\u6210\u529f\u5b8c\u6210\\\\n"<\/span>;<\/span>
                  \n }<\/span> else<\/span> {<\/span>
                  \n std::<\/span>cout <<<\/span> "\u8bf7\u6c42\u5931\u8d25\\\\n"<\/span>;<\/span>
                  \n }<\/span>
                  \n }<\/span>
                  \n catch<\/span> (<\/span>const<\/span> std::<\/span>exception&<\/span> e)<\/span> {<\/span>
                  \n std::<\/span>cerr <<<\/span> "\u4f1a\u8bdd\u9519\u8bef: "<\/span> <<<\/span> e.<\/span>what<\/span>(<\/span>)<\/span> <<<\/span> "\\\\n"<\/span>;<\/span>
                  \n }<\/span>
                  \n}<\/span><\/p>\n

                  int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
                  \n asio::<\/span>io_context io;<\/span><\/p>\n

                  \/\/ \u521b\u5efa\u5e76\u8fde\u63a5socket（\u793a\u4f8b）<\/span>
                  \n tcp::<\/span>socket socket<\/span>(<\/span>io)<\/span>;<\/span>
                  \n \/\/ \u5b9e\u9645\u4e2d\u5e94\u8fde\u63a5\u670d\u52a1\u5668: socket.connect(endpoint);<\/span><\/p>\n

                  \/\/ \u542f\u52a8\u5ba2\u6237\u7aef\u4f1a\u8bdd<\/span>
                  \n asio::<\/span>co_spawn<\/span>(<\/span>io,<\/span> client_session<\/span>(<\/span>std::<\/span>move<\/span>(<\/span>socket)<\/span>)<\/span>,<\/span> asio::<\/span>detached)<\/span>;<\/span><\/p>\n

                  io.<\/span>run<\/span>(<\/span>)<\/span>;<\/span>
                  \n return<\/span> 0<\/span>;<\/span>
                  \n}<\/span><\/p>\n

                  \u4e0a\u9762\u8fd9\u4e2a\u534f\u7a0b\u5b9e\u73b0\u8fd8\u662f\u6bd4\u8f83\u6e05\u6670\u7684，\u5982\u679c\u7528\u56de\u8c03\u5b9e\u73b0，\u5219\u975e\u5e38\u9ebb\u70e6：<\/p>\n

                  #<\/span>include<\/span> <boost\/asio.hpp><\/span><\/span>
                  \n#<\/span>include<\/span> <iostream><\/span><\/span>
                  \n#<\/span>include<\/span> <memory><\/span><\/span>
                  \n#<\/span>include<\/span> <functional><\/span><\/span><\/p>\n

                  namespace<\/span> asio =<\/span> boost::<\/span>asio;<\/span>
                  \nusing<\/span> asio::<\/span>ip::<\/span>tcp;<\/span>
                  \nnamespace<\/span> chrono =<\/span> std::<\/span>chrono;<\/span><\/p>\n

                  \/\/ \u524d\u5411\u58f0\u660e<\/span>
                  \nclass<\/span> ReliableRequest<\/span>;<\/span>
                  \nvoid<\/span> handle_write<\/span>(<\/span>boost::<\/span>system::<\/span>error_code ec,<\/span> size_t,<\/span>
                  \n std::<\/span>shared_ptr<<\/span>ReliableRequest><\/span> request)<\/span>;<\/span>
                  \nvoid<\/span> handle_read<\/span>(<\/span>boost::<\/span>system::<\/span>error_code ec,<\/span> size_t bytes_read,<\/span>
                  \n std::<\/span>shared_ptr<<\/span>ReliableRequest><\/span> request)<\/span>;<\/span>
                  \nvoid<\/span> handle_timeout<\/span>(<\/span>boost::<\/span>system::<\/span>error_code ec,<\/span>
                  \n std::<\/span>shared_ptr<<\/span>ReliableRequest><\/span> request)<\/span>;<\/span>
                  \nvoid<\/span> start_request<\/span>(<\/span>std::<\/span>shared_ptr<<\/span>ReliableRequest><\/span> request)<\/span>;<\/span><\/p>\n

                  \/\/ \u8bf7\u6c42\u72b6\u6001\u7ba1\u7406\u7c7b<\/span>
                  \nclass<\/span> ReliableRequest<\/span> :<\/span> public<\/span> std::<\/span>enable_shared_from_this<\/span><<\/span>ReliableRequest<\/span>><\/span><\/span> {<\/span>
                  \npublic<\/span>:<\/span>
                  \n ReliableRequest<\/span>(<\/span>tcp::<\/span>socket&<\/span> socket,<\/span> std::<\/span>string request,<\/span>
                  \n int<\/span> max_retries,<\/span> chrono::<\/span>seconds timeout)<\/span>
                  \n :<\/span> socket_<\/span>(<\/span>std::<\/span>move<\/span>(<\/span>socket)<\/span>)<\/span>
                  \n ,<\/span> request_<\/span>(<\/span>std::<\/span>move<\/span>(<\/span>request)<\/span>)<\/span>
                  \n ,<\/span> max_retries_<\/span>(<\/span>max_retries)<\/span>
                  \n ,<\/span> timeout_<\/span>(<\/span>timeout)<\/span>
                  \n ,<\/span> timer_<\/span>(<\/span>socket_.<\/span>get_executor<\/span>(<\/span>)<\/span>)<\/span>
                  \n ,<\/span> attempt_<\/span>(<\/span>0<\/span>)<\/span>
                  \n {<\/span>}<\/span><\/p>\n

                  void<\/span> start<\/span>(<\/span>)<\/span> {<\/span>
                  \n attempt_ =<\/span> 0<\/span>;<\/span>
                  \n start_attempt<\/span>(<\/span>)<\/span>;<\/span>
                  \n }<\/span><\/p>\n

                  private<\/span>:<\/span>
                  \n friend<\/span> void<\/span> handle_write<\/span>(<\/span>boost::<\/span>system::<\/span>error_code,<\/span> size_t,<\/span>
                  \n std::<\/span>shared_ptr<<\/span>ReliableRequest><\/span>)<\/span>;<\/span>
                  \n friend<\/span> void<\/span> handle_read<\/span>(<\/span>boost::<\/span>system::<\/span>error_code,<\/span> size_t,<\/span>
                  \n std::<\/span>shared_ptr<<\/span>ReliableRequest><\/span>)<\/span>;<\/span>
                  \n friend<\/span> void<\/span> handle_timeout<\/span>(<\/span>boost::<\/span>system::<\/span>error_code,<\/span>
                  \n std::<\/span>shared_ptr<<\/span>ReliableRequest><\/span>)<\/span>;<\/span><\/p>\n

                  void<\/span> start_attempt<\/span>(<\/span>)<\/span> {<\/span>
                  \n attempt_++<\/span>;<\/span>
                  \n std::<\/span>cout <<<\/span> "\u5c1d\u8bd5 #"<\/span> <<<\/span> attempt_ <<<\/span> "\/"<\/span> <<<\/span> max_retries_ <<<\/span> "\\\\n"<\/span>;<\/span><\/p>\n

                  auto<\/span> self =<\/span> shared_from_this<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                  \/\/ \u542f\u52a8\u5f02\u6b65\u5199\u5165<\/span>
                  \n asio::<\/span>async_write<\/span>(<\/span>
                  \n socket_,<\/span> asio::<\/span>buffer<\/span>(<\/span>request_)<\/span>,<\/span>
                  \n std::<\/span>bind<\/span>(<\/span>handle_write,<\/span> std::<\/span>placeholders::<\/span>_1,<\/span> std::<\/span>placeholders::<\/span>_2,<\/span> self)<\/span>
                  \n )<\/span>;<\/span>
                  \n }<\/span><\/p>\n

                  void<\/span> start_wait<\/span>(<\/span>)<\/span> {<\/span>
                  \n auto<\/span> self =<\/span> shared_from_this<\/span>(<\/span>)<\/span>;<\/span>
                  \n response_buffer_ =<\/span> std::<\/span>make_shared<<\/span>std::<\/span>array<<\/span>char<\/span>,<\/span> 1024<\/span>>><\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                  \/\/ \u542f\u52a8\u5f02\u6b65\u8bfb\u53d6<\/span>
                  \n socket_.<\/span>async_read_some<\/span>(<\/span>
                  \n asio::<\/span>buffer<\/span>(<\/span>*<\/span>response_buffer_)<\/span>,<\/span>
                  \n std::<\/span>bind<\/span>(<\/span>handle_read,<\/span> std::<\/span>placeholders::<\/span>_1,<\/span> std::<\/span>placeholders::<\/span>_2,<\/span> self)<\/span>
                  \n )<\/span>;<\/span><\/p>\n

                  \/\/ \u542f\u52a8\u8d85\u65f6\u5b9a\u65f6\u5668<\/span>
                  \n timer_.<\/span>expires_after<\/span>(<\/span>timeout_)<\/span>;<\/span>
                  \n timer_.<\/span>async_wait<\/span>(<\/span>
                  \n std::<\/span>bind<\/span>(<\/span>handle_timeout,<\/span> std::<\/span>placeholders::<\/span>_1,<\/span> self)<\/span>
                  \n )<\/span>;<\/span>
                  \n }<\/span><\/p>\n

                  void<\/span> handle_success<\/span>(<\/span>size_t bytes_read)<\/span> {<\/span>
                  \n std::<\/span>string response<\/span>(<\/span>response_buffer_-><\/span>data<\/span>(<\/span>)<\/span>,<\/span> bytes_read)<\/span>;<\/span>
                  \n std::<\/span>cout <<<\/span> "\u6536\u5230\u54cd\u5e94: "<\/span> <<<\/span> response <<<\/span> "\\\\n"<\/span>;<\/span>
                  \n if<\/span> (<\/span>completion_)<\/span> completion_<\/span>(<\/span>true<\/span>)<\/span>;<\/span>
                  \n }<\/span><\/p>\n

                  void<\/span> handle_failure<\/span>(<\/span>)<\/span> {<\/span>
                  \n std::<\/span>cout <<<\/span> "\u8bf7\u6c42\u5931\u8d25\\\\n"<\/span>;<\/span>
                  \n if<\/span> (<\/span>completion_)<\/span> completion_<\/span>(<\/span>false<\/span>)<\/span>;<\/span>
                  \n }<\/span><\/p>\n

                  void<\/span> handle_retry<\/span>(<\/span>)<\/span> {<\/span>
                  \n if<\/span> (<\/span>attempt_ <<\/span> max_retries_)<\/span> {<\/span>
                  \n std::<\/span>cout <<<\/span> "\u51c6\u5907\u91cd\u8bd5…\\\\n"<\/span>;<\/span>
                  \n start_attempt<\/span>(<\/span>)<\/span>;<\/span>
                  \n }<\/span> else<\/span> {<\/span>
                  \n std::<\/span>cout <<<\/span> "\u5df2\u8fbe\u6700\u5927\u91cd\u8bd5\u6b21\u6570\\\\n"<\/span>;<\/span>
                  \n handle_failure<\/span>(<\/span>)<\/span>;<\/span>
                  \n }<\/span>
                  \n }<\/span><\/p>\n

                  public<\/span>:<\/span>
                  \n \/\/ \u5b8c\u6210\u56de\u8c03<\/span>
                  \n using<\/span> CompletionHandler =<\/span> std::<\/span>function<<\/span>void<\/span>(<\/span>bool<\/span>)<\/span>><\/span>;<\/span>
                  \n CompletionHandler completion_;<\/span><\/p>\n

                  tcp::<\/span>socket socket_;<\/span>
                  \n std::<\/span>string request_;<\/span>
                  \n int<\/span> max_retries_;<\/span>
                  \n chrono::<\/span>seconds timeout_;<\/span>
                  \n asio::<\/span>steady_timer timer_;<\/span>
                  \n int<\/span> attempt_;<\/span>
                  \n std::<\/span>shared_ptr<<\/span>std::<\/span>array<<\/span>char<\/span>,<\/span> 1024<\/span>>><\/span> response_buffer_;<\/span>
                  \n}<\/span>;<\/span><\/p>\n

                  \/\/ \u5199\u5165\u5b8c\u6210\u5904\u7406<\/span>
                  \nvoid<\/span> handle_write<\/span>(<\/span>boost::<\/span>system::<\/span>error_code ec,<\/span> size_t,<\/span>
                  \n std::<\/span>shared_ptr<<\/span>ReliableRequest><\/span> request)<\/span> {<\/span>
                  \n if<\/span> (<\/span>ec)<\/span> {<\/span>
                  \n std::<\/span>cerr <<<\/span> "\u5199\u5165\u9519\u8bef: "<\/span> <<<\/span> ec.<\/span>message<\/span>(<\/span>)<\/span> <<<\/span> "\\\\n"<\/span>;<\/span>
                  \n request-><\/span>handle_failure<\/span>(<\/span>)<\/span>;<\/span>
                  \n return<\/span>;<\/span>
                  \n }<\/span><\/p>\n

                  request-><\/span>start_wait<\/span>(<\/span>)<\/span>;<\/span>
                  \n}<\/span><\/p>\n

                  \/\/ \u8bfb\u53d6\u5b8c\u6210\u5904\u7406<\/span>
                  \nvoid<\/span> handle_read<\/span>(<\/span>boost::<\/span>system::<\/span>error_code ec,<\/span> size_t bytes_read,<\/span>
                  \n std::<\/span>shared_ptr<<\/span>ReliableRequest><\/span> request)<\/span> {<\/span>
                  \n \/\/ \u53d6\u6d88\u5b9a\u65f6\u5668<\/span>
                  \n request-><\/span>timer_.<\/span>cancel<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                  if<\/span> (<\/span>ec ==<\/span> asio::<\/span>error::<\/span>operation_aborted)<\/span> {<\/span>
                  \n return<\/span>;<\/span> \/\/ \u8d85\u65f6\u5df2\u5904\u7406<\/span>
                  \n }<\/span><\/p>\n

                  if<\/span> (<\/span>ec)<\/span> {<\/span>
                  \n std::<\/span>cerr <<<\/span> "\u8bfb\u53d6\u9519\u8bef: "<\/span> <<<\/span> ec.<\/span>message<\/span>(<\/span>)<\/span> <<<\/span> "\\\\n"<\/span>;<\/span>
                  \n request-><\/span>handle_retry<\/span>(<\/span>)<\/span>;<\/span>
                  \n return<\/span>;<\/span>
                  \n }<\/span><\/p>\n

                  request-><\/span>handle_success<\/span>(<\/span>bytes_read)<\/span>;<\/span>
                  \n}<\/span><\/p>\n

                  \/\/ \u8d85\u65f6\u5904\u7406<\/span>
                  \nvoid<\/span> handle_timeout<\/span>(<\/span>boost::<\/span>system::<\/span>error_code ec,<\/span>
                  \n std::<\/span>shared_ptr<<\/span>ReliableRequest><\/span> request)<\/span> {<\/span>
                  \n if<\/span> (<\/span>ec ==<\/span> asio::<\/span>error::<\/span>operation_aborted)<\/span> {<\/span>
                  \n return<\/span>;<\/span> \/\/ \u8bfb\u53d6\u5df2\u5b8c\u6210<\/span>
                  \n }<\/span><\/p>\n

                  if<\/span> (<\/span>ec)<\/span> {<\/span>
                  \n std::<\/span>cerr <<<\/span> "\u5b9a\u65f6\u5668\u9519\u8bef: "<\/span> <<<\/span> ec.<\/span>message<\/span>(<\/span>)<\/span> <<<\/span> "\\\\n"<\/span>;<\/span>
                  \n request-><\/span>handle_retry<\/span>(<\/span>)<\/span>;<\/span>
                  \n return<\/span>;<\/span>
                  \n }<\/span><\/p>\n

                  \/\/ \u53d6\u6d88\u8bfb\u53d6\u64cd\u4f5c<\/span>
                  \n request-><\/span>socket_.<\/span>cancel<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                  std::<\/span>cout <<<\/span> "\u8bf7\u6c42\u8d85\u65f6, "<\/span>;<\/span>
                  \n request-><\/span>handle_retry<\/span>(<\/span>)<\/span>;<\/span>
                  \n}<\/span><\/p>\n

                  \/\/ \u542f\u52a8\u53ef\u9760\u8bf7\u6c42<\/span>
                  \nvoid<\/span> start_reliable_request<\/span>(<\/span>tcp::<\/span>socket socket,<\/span> std::<\/span>string request,<\/span>
                  \n ReliableRequest::<\/span>CompletionHandler completion,<\/span>
                  \n int<\/span> max_retries =<\/span> 3<\/span>,<\/span> chrono::<\/span>seconds timeout =<\/span> 3<\/span>s)<\/span> {<\/span>
                  \n auto<\/span> request_obj =<\/span> std::<\/span>make_shared<<\/span>ReliableRequest><\/span>(<\/span>
                  \n std::<\/span>move<\/span>(<\/span>socket)<\/span>,<\/span> std::<\/span>move<\/span>(<\/span>request)<\/span>,<\/span> max_retries,<\/span> timeout
                  \n )<\/span>;<\/span>
                  \n request_obj-><\/span>completion_ =<\/span> completion;<\/span>
                  \n request_obj-><\/span>start<\/span>(<\/span>)<\/span>;<\/span>
                  \n}<\/span><\/p>\n

                  \/\/ \u793a\u4f8b\u4f7f\u7528<\/span>
                  \nvoid<\/span> handle_request_complete<\/span>(<\/span>bool<\/span> success)<\/span> {<\/span>
                  \n if<\/span> (<\/span>success)<\/span> {<\/span>
                  \n std::<\/span>cout <<<\/span> "\u8bf7\u6c42\u6210\u529f\u5b8c\u6210\\\\n"<\/span>;<\/span>
                  \n }<\/span> else<\/span> {<\/span>
                  \n std::<\/span>cout <<<\/span> "\u8bf7\u6c42\u5931\u8d25\\\\n"<\/span>;<\/span>
                  \n }<\/span>
                  \n}<\/span><\/p>\n

                  int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
                  \n asio::<\/span>io_context io;<\/span><\/p>\n

                  \/\/ \u521b\u5efasocket（\u793a\u4f8b）<\/span>
                  \n tcp::<\/span>socket socket<\/span>(<\/span>io)<\/span>;<\/span>
                  \n \/\/ \u5b9e\u9645\u4e2d\u5e94\u8fde\u63a5\u670d\u52a1\u5668<\/span><\/p>\n

                  \/\/ \u542f\u52a8\u53ef\u9760\u8bf7\u6c42<\/span>
                  \n start_reliable_request<\/span>(<\/span>
                  \n std::<\/span>move<\/span>(<\/span>socket)<\/span>,<\/span>
                  \n "QUERY_DATA"<\/span>,<\/span>
                  \n handle_request_complete,<\/span>
                  \n 3<\/span>,<\/span>
                  \n chrono::<\/span>seconds<\/span>(<\/span>3<\/span>)<\/span>
                  \n )<\/span>;<\/span><\/p>\n

                  io.<\/span>run<\/span>(<\/span>)<\/span>;<\/span>
                  \n return<\/span> 0<\/span>;<\/span>
                  \n}<\/span><\/p>\n

                  2. &&\u64cd\u4f5c\u7b26<\/h3>\n

                  &&\u64cd\u4f5c\u7b26\u5141\u8bb8\u4f60\u540c\u65f6\u542f\u52a8\u591a\u4e2a\u5f02\u6b65\u64cd\u4f5c，\u7b49\u5f85\u6240\u6709\u64cd\u4f5c\u5b8c\u6210，\u4ee5\u5143\u7ec4\u5f62\u5f0f\u83b7\u53d6\u6240\u6709\u7ed3\u679c<\/p>\n

                  auto [result1, result2] = co_await (
                  \n async_op1(use_awaitable) &&
                  \n async_op2(use_awaitable)
                  \n);<\/p>\n

                  \u4f8b\u5982\u8981\u591a\u4e2a\u63a5\u53e3\u7ed3\u679c\u6267\u884c\u5b8c\u6210\u540e\u624d\u8fd4\u56de，\u90a3\u4e48\u4e45\u53ef\u4ee5\u7528&&\u64cd\u4f5c\u7b26<\/p>\n

                  asio::<\/span>awaitable<<\/span>SearchResults><\/span> search_products<\/span>(<\/span>string_view query)<\/span> {<\/span>
                  \n \/\/ \u5e76\u884c\u641c\u7d22\u591a\u4e2a\u5206\u7c7b<\/span>
                  \n auto<\/span> [<\/span>electronics,<\/span> clothing,<\/span> books]<\/span> =<\/span> co_await<\/span> (<\/span>
                  \n product_service.<\/span>search<\/span>(<\/span>"electronics"<\/span>,<\/span> query)<\/span> &&<\/span>
                  \n product_service.<\/span>search<\/span>(<\/span>"clothing"<\/span>,<\/span> query)<\/span> &&<\/span>
                  \n product_service.<\/span>search<\/span>(<\/span>"books"<\/span>,<\/span> query)<\/span>
                  \n )<\/span>;<\/span>
                  \n .<\/span>.<\/span>.<\/span>
                  \n \/\/\u5408\u5e76\u5230results<\/span>
                  \n co_return<\/span> results;<\/span>
                  \n}<\/span><\/p>\n

                  \u603b\u7ed3<\/h2>\n

                  Asio\u534f\u7a0b\u65b9\u4fbf\u4e86C++\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u5f00\u53d1，\u5728\u4fdd\u6301\u5f02\u6b65\u9ad8\u6027\u80fd\u7684\u540c\u65f6，\u63d0\u4f9b\u540c\u6b65\u4ee3\u7801\u7684\u7b80\u6d01\u6027，\u540c\u6b65\u6267\u884c\u6d41\u7b80\u5316\u8c03\u8bd5\u548c\u6027\u80fd\u5206\u6790，\u968f\u7740C++20\u6807\u51c6\u7684\u5e7f\u6cdb\u91c7\u7528，\u534f\u7a0b\u5df2\u6210\u4e3a\u6784\u5efa\u4e0b\u4e00\u4ee3\u9ad8\u6027\u80fd\u670d\u52a1\u5668\u7684\u9996\u9009\u8303\u5f0f\u3002<\/p>\n

                  \u4f46\u8981\u6ce8\u610f\u7684\u662f，\u534f\u7a0b\u5e76\u4e0d\u4f1a\u63d0\u9ad8\u7a0b\u5e8f\u8fd0\u884c\u7684\u6548\u7387，\u4ece\u539f\u7406\u4e0a\u8bb2，\u534f\u7a0b\u6709\u53ef\u80fd\u8fd8\u6ca1\u6709\u56de\u8c03\u9ad8\u6548，\u4f46\u8fd9\u4e2a\u6027\u80fd\u5e76\u4e0d\u4f1a\u6709\u592a\u5927\u7684\u5dee\u8ddd<\/p>\n","protected":false},"excerpt":{"rendered":"

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