{"id":45561,"date":"2025-07-30T00:31:01","date_gmt":"2025-07-29T16:31:01","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/45561.html"},"modified":"2025-07-30T00:31:01","modified_gmt":"2025-07-29T16:31:01","slug":"c-%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b15-%e5%88%a9%e7%94%a8asio%e5%8d%8f%e7%a8%8b%e6%90%ad%e5%bb%ba%e5%bc%82%e6%ad%a5%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/45561.html","title":{"rendered":"C++ \u7f51\u7edc\u7f16\u7a0b(15) \u5229\u7528asio\u534f\u7a0b\u642d\u5efa\u5f02\u6b65\u670d\u52a1\u5668"},"content":{"rendered":"<p>&#x1f680; [\u534f\u7a0b\u4e0e\u5f02\u6b65\u670d\u52a1\u5668\u5b9e\u6218]&#xff1a;[C&#043;&#043;20\u534f\u7a0b\u539f\u7406\u4e0eBoost.Asio\u5f02\u6b65\u670d\u52a1\u5668\u5f00\u53d1] &#x1f4c5; \u66f4\u65b0\u65f6\u95f4&#xff1a;2025\u5e7407\u670805\u65e5 &#x1f3f7;\ufe0f \u6807\u7b7e&#xff1a;C&#043;&#043;20 | \u534f\u7a0b | Boost.Asio | \u5f02\u6b65\u7f16\u7a0b | \u7f51\u7edc\u670d\u52a1\u5668<\/p>\n<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u524d\u8a00<\/li>\n<li>\u4e00\u3001\u4ec0\u4e48\u662f\u534f\u7a0b&#xff1f;<\/li>\n<li>\u4e8c\u3001\u7ebf\u7a0b\u4e0e\u534f\u7a0b&#xff1f;<\/li>\n<li>\u4e09\u3001\u4f7f\u7528\u534f\u7a0b\u642d\u5efa\u5f02\u6b65\u670d\u52a1\u5668\u8fdb\u884c\u901a\u4fe1<\/li>\n<li>\n<ul>\n<li>1.\u670d\u52a1\u7aef<\/li>\n<li>\n<ul>\n<li>1.\u6d41\u7a0b\u56fe<\/li>\n<li>2.\u670d\u52a1\u7aef\u4ee3\u7801<\/li>\n<li>\n<ul>\n<li>1.\u4e3b\u51fd\u6570\u5165\u53e3<\/li>\n<li>2.lisenter \u534f\u7a0b\u51fd\u6570<\/li>\n<li>3.echo\u534f\u7a0b\u51fd\u6570<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>2.\u5ba2\u6237\u7aef<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u6d4b\u8bd5<\/li>\n<li>\u603b\u7ed3<\/li>\n<\/ul>\n<hr \/>\n<h2>\u524d\u8a00<\/h2>\n<p>\u4eca\u5929\u6211\u4eec\u5b66\u4e60\u534f\u7a0b\u7684\u57fa\u672c\u6982\u5ff5&#xff0c;\u4ee5\u53ca\u5982\u4f55\u7528\u534f\u7a0b\u6765\u642d\u5efa\u4e00\u4e2a\u7b80\u5355\u7684\u5f02\u6b65\u670d\u52a1\u5668\u6765\u8fdb\u884c\u4e0e\u5ba2\u6237\u7aef\u7684\u6536\u53d1\u6570\u636e<\/p>\n<hr \/>\n<h2>\u4e00\u3001\u4ec0\u4e48\u662f\u534f\u7a0b&#xff1f;<\/h2>\n<p>\u534f\u7a0b&#xff08;Coroutine&#xff09;\u662f\u4e00\u79cd\u6bd4\u7ebf\u7a0b\u66f4\u8f7b\u91cf\u7ea7\u7684\u201c\u5e76\u53d1\u7f16\u7a0b\u201d\u65b9\u5f0f \u5b83\u5141\u8bb8\u4f60\u5728\u4e00\u4e2a\u7ebf\u7a0b\u5185&#xff0c;\u628a\u4efb\u52a1\u5206\u6210\u591a\u4e2a\u53ef\u4ee5\u6302\u8d77\u548c\u6062\u590d\u7684\u5c0f\u6bb5&#xff0c;\u5199\u51fa\u201c\u50cf\u540c\u6b65\u4e00\u6837\u7684\u5f02\u6b65\u4ee3\u7801\u201d\u3002<\/p>\n<p>\u534f\u7a0b\u7684\u7279\u70b9 \u53ef\u4ee5\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u4e3b\u52a8\u6682\u505c&#xff08;\u6302\u8d77&#xff09;&#xff0c;\u7b49\u6761\u4ef6\u6ee1\u8db3\u540e\u6062\u590d\u6267\u884c \u591a\u4e2a\u534f\u7a0b\u53ef\u4ee5\u5728\u540c\u4e00\u4e2a\u7ebf\u7a0b\u5185\u5207\u6362&#xff0c;\u5207\u6362\u901f\u5ea6\u975e\u5e38\u5feb \u7531\u7a0b\u5e8f\u5458\u6216\u6846\u67b6\u8c03\u5ea6&#xff0c;\u800c\u4e0d\u662f\u64cd\u4f5c\u7cfb\u7edf<\/p>\n<p>\u603b\u7ed3 <font color=\"red\">\u534f\u7a0b\u5c31\u662f\u53ef\u4ee5\u968f\u65f6\u6302\u8d77\u548c\u6062\u590d\u7684\u8f7b\u91cf\u7ea7\u4efb\u52a1&#xff0c;\u8ba9\u4f60\u7528\u5f88\u5c11\u7684\u8d44\u6e90\u5b9e\u73b0\u9ad8\u6548\u7684\u5e76\u53d1\u548c\u5f02\u6b65\u7f16\u7a0b<\/font><\/p>\n<h2>\u4e8c\u3001\u7ebf\u7a0b\u4e0e\u534f\u7a0b&#xff1f;<\/h2>\n<p>\u76f4\u89c2\u6bd4\u55bb \u7ebf\u7a0b\u50cf\u201c\u591a\u4e2a\u4eba\u5404\u81ea\u505a\u4e8b\u201d \u534f\u7a0b\u50cf\u201c\u4e00\u4e2a\u4eba\u505a\u591a\u4ef6\u4e8b&#xff0c;\u53ef\u4ee5\u968f\u65f6\u6682\u505c\u5f53\u524d\u4efb\u52a1&#xff0c;\u53bb\u505a\u522b\u7684&#xff0c;\u518d\u56de\u6765\u7ee7\u7eed\u201d<\/p>\n<h2>\u4e09\u3001\u4f7f\u7528\u534f\u7a0b\u642d\u5efa\u5f02\u6b65\u670d\u52a1\u5668\u8fdb\u884c\u901a\u4fe1<\/h2>\n<h3>1.\u670d\u52a1\u7aef<\/h3>\n<h4>1.\u6d41\u7a0b\u56fe<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250729163058-6888f742eb8e8.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>1.\u7a0b\u5e8f\u542f\u52a8&#xff08;main&#xff09; \u521d\u59cb\u5316 io_context \u8bbe\u7f6e\u4fe1\u53f7\u5904\u7406&#xff08;\u76d1\u542c Ctrl&#043;C \u7b49\u4fe1\u53f7&#xff0c;\u4f18\u96c5\u9000\u51fa&#xff09; \u542f\u52a8 lisenter \u534f\u7a0b<\/p>\n<p>2.lisenter \u534f\u7a0b \u521b\u5efa acceptor&#xff0c;\u76d1\u542c 10086 \u7aef\u53e3 \u8fdb\u5165\u65e0\u9650\u5faa\u73af&#xff1a; \u5f02\u6b65\u7b49\u5f85\u65b0\u8fde\u63a5&#xff08;co_await acceptor.async_accept()&#xff09; \u6bcf\u6709\u4e00\u4e2a\u65b0\u8fde\u63a5&#xff0c;\u542f\u52a8\u4e00\u4e2a echo \u534f\u7a0b\u5904\u7406\u8be5\u8fde\u63a5<\/p>\n<p>3.echo \u534f\u7a0b \u8fdb\u5165\u65e0\u9650\u5faa\u73af&#xff1a; \u5f02\u6b65\u8bfb\u53d6\u5ba2\u6237\u7aef\u6570\u636e&#xff08;co_await socket.async_read_some()&#xff09; \u5f02\u6b65\u5199\u56de\u6570\u636e&#xff08;co_await async_write()&#xff09; \u4fe1\u53f7\u5904\u7406 \u6536\u5230\u7ec8\u6b62\u4fe1\u53f7\u65f6&#xff0c;\u8c03\u7528 ioc.stop()&#xff0c;\u4f18\u96c5\u5173\u95ed\u670d\u52a1\u5668<\/p>\n<h4>2.\u670d\u52a1\u7aef\u4ee3\u7801<\/h4>\n<h5>1.\u4e3b\u51fd\u6570\u5165\u53e3<\/h5>\n<p>\u6211\u4eec\u5728\u4e3b\u51fd\u6570\u4e2d\u5229\u7528 try catch \u6765\u8fdb\u884c\u8dd1\u4ee3\u7801&#xff0c;\u8fd9\u6837\u53ef\u4ee5\u9632\u6b62\u540e\u7eed\u7684\u51fa\u9519&#xff0c; \u6211\u4eec\u5148\u5b9a\u4e49\u4e00\u4e2a\u4fe1\u53f7\u96c6signal_set\u6765\u5b9e\u73b0\u670d\u52a1\u5668\u7684\u4f18\u96c5\u9000\u51fa&#xff0c;\u5f53\u5ba2\u6237\u7aef\u4f7f\u7528Ctrl&#043;C\u7b49\u64cd\u4f5c\u7684\u65f6\u5019&#xff0c;\u6211\u4eec\u53ef\u4ee5\u901a\u77e5 \u4e0a\u4e0b\u6587 io_context\u76f4\u63a5\u8c03\u7528 .stop() \u6765\u6682\u505c\u670d\u52a1<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">try<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>io_context <span class=\"token function\">ioc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>signal_set <span class=\"token function\">signals<\/span><span class=\"token punctuation\">(<\/span>ioc<span class=\"token punctuation\">,<\/span> SIGINT<span class=\"token punctuation\">,<\/span> SIGTERM<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        signals<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_wait<\/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 keyword\">auto<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">auto<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                ioc<span class=\"token punctuation\">.<\/span><span class=\"token function\">stop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span>ioc<span class=\"token punctuation\">,<\/span><span class=\"token function\">lisenter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>detached<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u542f\u52a8\u534f\u7a0b<\/span><br \/>\n        ioc<span class=\"token punctuation\">.<\/span><span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">catch<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token operator\">::<\/span>exception<span class=\"token operator\">&amp;<\/span> e<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;main Exception is&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">what<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5728\u5199 Lambda \u8868\u8fbe\u5f0f\u7684\u65f6\u5019\u5982\u679c\u8981\u8c03\u7528\u4e0a\u4e0b\u6587io_context\u5fc5\u987b\u7528&amp;\u6355\u83b7 \u6838\u5fc3\u539f\u56e0\u662f&#xff1a;io_context&#xff08;\u4ee5\u53ca\u5f88\u591a Asio \u76f8\u5173\u5bf9\u8c61&#xff09;\u672c\u8eab\u7981\u6b62\u62f7\u8d1d&#xff0c;\u53ea\u80fd\u88ab\u5f15\u7528\u6355\u83b7&#xff0c;\u4e0d\u80fd\u88ab\u503c\u6355\u83b7<\/p>\n<p><span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span>ioc<span class=\"token punctuation\">,<\/span><span class=\"token function\">lisenter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>detached<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u542f\u52a8\u534f\u7a0b<\/span><\/p>\n<p>co_spawn co_spawn\u8868\u793a\u542f\u52a8\u4e00\u4e2a\u534f\u7a0b&#xff0c;\u53c2\u6570\u5206\u522b\u4e3a\u8c03\u5ea6\u5668&#xff0c;\u6267\u884c\u7684\u51fd\u6570&#xff0c;\u4ee5\u53ca\u542f\u52a8\u65b9\u5f0f, \u6bd4\u5982\u6211\u4eec\u542f\u52a8\u4e86\u4e00\u4e2a\u534f\u7a0b&#xff0c;deatched\u8868\u793a\u5c06\u534f\u7a0b\u5bf9\u8c61\u5206\u79bb\u51fa\u6765&#xff0c;\u8fd9\u79cd\u542f\u52a8\u65b9\u5f0f\u53ef\u4ee5\u542f\u52a8\u591a\u4e2a\u534f\u7a0b&#xff0c;\u4ed6\u4eec\u90fd\u662f\u72ec\u7acb\u7684&#xff0c;\u5982\u4f55\u8c03\u5ea6\u53d6\u51b3\u4e8e\u8c03\u5ea6\u5668&#xff0c;\u5728\u7528\u6237\u7684\u611f\u77e5\u4e0a\u66f4\u50cf\u662f\u7ebf\u7a0b\u8c03\u5ea6\u7684\u6a21\u5f0f&#xff0c;\u7c7b\u4f3c\u4e8e\u5e76\u53d1\u8fd0\u884c&#xff0c;\u5176\u5b9e\u5e95\u5c42\u90fd\u662f\u4e32\u884c\u7684<\/p>\n<p>\u6b64\u65f6\u9700\u8981\u4f20\u5165\u4e09\u4e2a\u53c2\u6570 \u7b2c\u4e00\u4e2a\u53c2\u6570 boost::asio::io_context \u6240\u6709\u5f02\u6b65\u4e8b\u4ef6\u548c\u534f\u7a0b\u90fd\u8981\u7ed1\u5b9a\u5230\u67d0\u4e2a io_context&#xff0c;\u5b83\u8d1f\u8d23\u8c03\u5ea6\u548c\u6267\u884c<\/p>\n<p>\u7b2c\u4e8c\u4e2a\u53c2\u6570 \u662f\u4f60\u81ea\u5b9a\u4e49\u7684\u534f\u7a0b\u51fd\u6570&#xff0c;\u8fd4\u56de\u7c7b\u578b\u901a\u5e38\u662f awaitable&lt;void&gt; \u8fd9\u91cc\u6211\u4eec\u81ea\u5b9a\u4e49\u7684\u51fd\u6570\u662flisenter()<\/p>\n<p>\u7b2c\u4e09\u4e2a\u53c2\u6570 \u534f\u7a0b\u7684\u5b8c\u6210\u65b9\u5f0f \u603b\u5171\u6709\u4e09\u79cd&#xff0c;\u5206\u522b\u662f detached \u4f5c\u7528&#xff1a;\u534f\u7a0b\u5206\u79bb\u8fd0\u884c&#xff0c;\u4e3b\u7a0b\u5e8f\u4e0d\u5173\u5fc3\u534f\u7a0b\u7684\u8fd4\u56de\u503c\u548c\u5f02\u5e38\u3002 \u7528\u6cd5&#xff1a;\u9002\u5408\u201c\u53ea\u7ba1\u542f\u52a8&#xff0c;\u4e0d\u5173\u5fc3\u540e\u7eed\u201d\u7684\u573a\u666f&#xff08;\u5982\u670d\u52a1\u5668\u76d1\u542c\u3001\u540e\u53f0\u4efb\u52a1&#xff09;<\/p>\n<p>use_awaitable \u4f5c\u7528&#xff1a;\u8ba9\u534f\u7a0b\u7684\u7ed3\u679c\u53ef\u4ee5\u88ab co_await \u7b49\u5f85&#xff0c;\u7528\u4e8e\u534f\u7a0b\u4e4b\u95f4\u7684\u5d4c\u5957\u548c\u7ec4\u5408\u3002 \u7528\u6cd5&#xff1a;\u9002\u5408\u4f60\u60f3\u5728\u53e6\u4e00\u4e2a\u534f\u7a0b\u91cc\u7b49\u5f85\u8fd9\u4e2a\u534f\u7a0b\u7684\u7ed3\u679c<\/p>\n<p>\u6700\u540e\u4e00\u79cd\u662f\u81ea\u5b9a\u4e49\u7684\u56de\u8c03\u51fd\u6570<\/p>\n<p>\u6240\u4ee5\u6211\u4eec\u8fd9\u53e5\u8bdd<\/p>\n<p><span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span>ioc<span class=\"token punctuation\">,<\/span><span class=\"token function\">lisenter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>detached<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u542f\u52a8\u534f\u7a0b<\/span><\/p>\n<p>\u7684\u5b8c\u6574\u610f\u601d\u5c31\u662f <font color=\"red\">\u5728 ioc \u8fd9\u4e2a\u4e8b\u4ef6\u5faa\u73af\u4e2d&#xff0c;\u542f\u52a8\u4e00\u4e2a lisenter \u534f\u7a0b&#xff0c;\u8ba9\u5b83\u81ea\u5df1\u8fd0\u884c&#xff0c;\u4e3b\u7a0b\u5e8f\u4e0d\u5173\u5fc3\u5b83\u7684\u7ed3\u679c<\/font><\/p>\n<h5>2.lisenter \u534f\u7a0b\u51fd\u6570<\/h5>\n<p>\u6211\u4eec\u5b9a\u4e49\u4e00\u4e2a\u534f\u7a0b\u51fd\u6570&#xff0c;\u7136\u540e\u5728\u534f\u7a0b\u51fd\u6570\u4e2d\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u76d1\u542c\u5668acceptor\u8fdb\u884c\u7ed1\u5b9a\u4e0a\u4e0b\u6587\u548ctcp\u534f\u8bae\u548c\u7aef\u53e3\u53f7<\/p>\n<p>\u7136\u540e\u6211\u4eec\u8c03\u7528\u4e00\u4e2a\u6b7b\u5faa\u73af&#xff0c;\u5185\u90e8\u5f02\u6b65\u7684\u8fdb\u884c\u76d1\u542c\u7136\u540e\u521b\u5efa\u4e00\u4e2asocket&#xff0c;\u7136\u540e\u6211\u4eec\u6839\u636e\u8fd9\u4e2asocket\u518d\u521b\u5efa\u4e00\u4e2a\u534f\u7a0becho\u5355\u72ec\u7ba1\u7406\u6b64\u5ba2\u6237\u7aef\u7684\u901a\u4fe1<\/p>\n<p>awaitable<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">lisenter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">auto<\/span> executor <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> this_coro<span class=\"token operator\">::<\/span>executor<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/co_await\u5f02\u6b65\u83b7\u53d6\u8c03\u5ea6\u5668<\/span><br \/>\n    tcp<span class=\"token operator\">::<\/span>acceptor <span class=\"token function\">acceptor<\/span><span class=\"token punctuation\">(<\/span>executor<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span> tcp<span class=\"token operator\">::<\/span><span class=\"token function\">v4<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">10086<\/span> <span class=\"token punctuation\">}<\/span><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 punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        tcp<span class=\"token operator\">::<\/span>socket socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> acceptor<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_accept<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span>executor<span class=\"token punctuation\">,<\/span> <span class=\"token function\">echo<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token operator\">::<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>socket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> detached<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u4e3a\u6bcf\u4e00\u4e2a\u8fde\u63a5\u5355\u72ec\u542f\u52a8 \u4e00\u4e2a\u534f\u7a0b\u8fdb\u884c\u6536\u53d1\u6570\u636e<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5982\u679c\u8981\u5199\u534f\u7a0b\u51fd\u6570&#xff0c;\u5fc5\u987b\u662f\u8fd9\u79cd\u7c7b\u578b<\/p>\n<p>awaitable<span class=\"token operator\">&lt;<\/span>T<span class=\"token operator\">&gt;<\/span><\/p>\n<p>\u6211\u4eec\u5728\u534f\u7a0b\u4e2d\u8fdb\u884c\u4e86\u5bf9\u5f53\u524d\u534f\u7a0b\u83b7\u53d6\u8c03\u5ea6\u5668\u7684\u5b9e\u73b0<\/p>\n<p><span class=\"token keyword\">auto<\/span> executor <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> this_coro<span class=\"token operator\">::<\/span>executor<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/co_await\u5f02\u6b65\u83b7\u53d6\u8c03\u5ea6\u5668<\/span><\/p>\n<p>\u5728 Boost.Asio \u4e2d&#xff0c;executor \u662f\u4e00\u4e2a\u201c\u6267\u884c\u73af\u5883\u201d&#xff0c;\u8d1f\u8d23\u8c03\u5ea6\u548c\u7ba1\u7406\u5f02\u6b65\u64cd\u4f5c\u7684\u6267\u884c \u5e38\u89c1\u7684 executor \u6709 io_context::executor_type&#xff0c;\u5b83\u548c io_context \u7ed1\u5b9a<\/p>\n<p>\u56e0\u4e3a\u6211\u4eec\u5728\u4e3b\u51fd\u6570\u4e2d\u4f7f\u7528\u4e86<\/p>\n<p><span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span>ioc<span class=\"token punctuation\">,<\/span> <span class=\"token function\">lisenter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> detached<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u542f\u52a8\u534f\u7a0b\u65f6&#xff0c;\u534f\u7a0b\u4f1a\u81ea\u52a8\u548c ioc \u7ed1\u5b9a \u4f46\u5728\u534f\u7a0b\u4f53\u5185&#xff0c;\u5982\u679c\u4f60\u8981\u521b\u5efa\u65b0\u7684\u5f02\u6b65\u5bf9\u8c61&#xff08;\u5982 acceptor&#xff09;&#xff0c;\u9700\u8981\u660e\u786e\u544a\u8bc9\u5b83\u7528\u54ea\u4e2a executor&#xff0c;\u5426\u5219\u5b83\u4e0d\u77e5\u9053\u8be5\u548c\u54ea\u4e2a\u4e8b\u4ef6\u5faa\u73af\u5173\u8054 \u6240\u4ee5\u76f8\u5f53\u4e8e\u7ed9\u8fd9\u4e2a\u76d1\u542c\u5668\u7ed1\u5b9a\u4e86\u4e00\u4e2a\u4e0a\u4e0b\u6587io_context<\/p>\n<p>\u7136\u540e\u6211\u4eec\u518d\u6765\u4ecb\u7ecd\u4e00\u4e0b co_await co_await \u662f C&#043;&#043;20 \u534f\u7a0b\u7684\u901a\u7528\u5173\u952e\u5b57&#xff0c;\u5b83\u7684\u4f5c\u7528\u662f\u7b49\u5f85\u4e00\u4e2a \u201c\u53ef\u7b49\u5f85\u5bf9\u8c61\u201d \u5b8c\u6210&#xff0c;\u5e76\u83b7\u53d6\u5176\u7ed3\u679c<\/p>\n<p>\u6bd4\u5982\u8fd9\u91cc\u6211\u4eec\u7528\u6765\u83b7\u53d6\u5f53\u524d\u534f\u7a0b\u7684\u8c03\u5ea6\u5668\u548c\u76d1\u542c\u5668\u5206\u914d\u7684socket<\/p>\n<p><span class=\"token keyword\">auto<\/span> executor <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> this_coro<span class=\"token operator\">::<\/span>executor<span class=\"token punctuation\">;<\/span><br \/>\ntcp<span class=\"token operator\">::<\/span>socket socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> acceptor<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_accept<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>3.echo\u534f\u7a0b\u51fd\u6570<\/h5>\n<p>\u8fd9\u4e2a\u534f\u7a0b\u51fd\u6570\u5c31\u662f\u5355\u72ec\u4e3a\u5f53\u524d\u5206\u914d\u7684\u5ba2\u6237\u7aef\u8fdb\u884c\u8bfb\u5199\u901a\u4fe1\u7684\u5b9e\u73b0<\/p>\n<p>awaitable<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token function\">echo<\/span><span class=\"token punctuation\">(<\/span>tcp<span class=\"token operator\">::<\/span>socket socket<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">try<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> data<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/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 punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token operator\">::<\/span>size_t n<span class=\"token operator\">&#061;<\/span><span class=\"token keyword\">co_await<\/span><br \/>\n            socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_read_some<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span><span class=\"token function\">buffer<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">co_await<\/span> <span class=\"token function\">async_write<\/span><br \/>\n            <span class=\"token punctuation\">(<\/span>socket<span class=\"token punctuation\">,<\/span> boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span><span class=\"token function\">buffer<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">,<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> use_awaitable<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 keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>std<span class=\"token operator\">::<\/span>exception<span class=\"token operator\">&amp;<\/span> e<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;echo Exception is&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">what<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><font color=\"red\">\u6211\u4eec\u591a\u6b21\u5229\u7528\u8fd9\u4e2aco_await\u5b9e\u73b0\u4e86\u5c06\u770b\u4f3c\u540c\u6b65\u7684\u4ee3\u7801&#xff0c;\u5b9e\u73b0\u4e86\u5f02\u6b65\u7b49\u5f85\u7684\u64cd\u4f5c&#xff0c;\u6bd4\u5982\u8fd9\u53e5<\/font><\/p>\n<p><span class=\"token comment\">\/\/\u83b7\u53d6\u6536\u5230\u6570\u636e\u957f\u5ea6<\/span><br \/>\nstd<span class=\"token operator\">::<\/span>size_t n<span class=\"token operator\">&#061;<\/span><span class=\"token keyword\">co_await<\/span><br \/>\nsocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_read_some<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span><span class=\"token function\">buffer<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u5f02\u6b65\u5199<\/span><br \/>\n<span class=\"token keyword\">co_await<\/span> <span class=\"token function\">async_write<\/span><br \/>\n<span class=\"token punctuation\">(<\/span>socket<span class=\"token punctuation\">,<\/span> boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span><span class=\"token function\">buffer<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">,<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>2.\u5ba2\u6237\u7aef<\/h3>\n<p>\u5ba2\u6237\u7aef\u6211\u4eec\u8fd8\u662f\u7528\u4ee5\u524d\u7684\u7b80\u6613\u7684\u7248\u672c&#xff0c;\u53d1\u9001 hello world \u8fdb\u884c\u6d4b\u8bd5&#xff0c;\u4e0d\u8003\u8651\u5176\u4ed6\u7684\u95ee\u9898<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/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;boost\/asio.hpp&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>ip<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> MAX_LENGTH <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1024<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">try<\/span><\/p>\n<p>    <span class=\"token punctuation\">{<\/span><br \/>\n        boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>io_context ioc<span class=\"token punctuation\">;<\/span><br \/>\n        tcp<span class=\"token operator\">::<\/span>endpoint <span class=\"token function\">remote_ep<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>ip<span class=\"token operator\">::<\/span><span class=\"token function\">make_address<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10086<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        tcp<span class=\"token operator\">::<\/span>socket <span class=\"token function\">sock<\/span><span class=\"token punctuation\">(<\/span>ioc<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        boost<span class=\"token operator\">::<\/span>system<span class=\"token operator\">::<\/span>error_code error <span class=\"token operator\">&#061;<\/span> boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>error<span class=\"token operator\">::<\/span>host_not_found<span class=\"token punctuation\">;<\/span><br \/>\n        sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>remote_ep<span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;connect failed, code is&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> error<span class=\"token punctuation\">.<\/span><span class=\"token function\">value<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span><span class=\"token string\">&#034;  error msg is &#034;<\/span><span class=\"token operator\">&lt;&lt;<\/span>error<span class=\"token punctuation\">.<\/span><span class=\"token function\">what<\/span><span class=\"token punctuation\">(<\/span><span 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