{"id":266686,"date":"2024-05-15T16:54:53","date_gmt":"2024-05-15T08:54:53","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/266686.html"},"modified":"2024-05-15T16:55:03","modified_gmt":"2024-05-15T08:55:03","slug":"rust%e4%b8%adasync%e4%bb%a3%e7%a0%81%e5%9d%97%e5%92%8casync-fn%e6%98%af%e6%80%8e%e4%b9%88%e7%bc%96%e8%af%91%e6%88%90%e7%8a%b6%e6%80%81%e6%9c%ba%e7%9a%84","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/266686.html","title":{"rendered":"rust\u4e2dasync\u4ee3\u7801\u5757\u548casync fn\u662f\u600e\u4e48\u7f16\u8bd1\u6210\u72b6\u6001\u673a\u7684"},"content":{"rendered":"

\"rust\u4e2dasync\u4ee3\u7801\u5757\u548casync<\/p>\n

\u5728Rust\u4e2d\uff0casync<\/code> \u4ee3\u7801\u5757\u548c async fn<\/code> \u975e\u5e38\u5173\u952e\uff0c\u56e0\u4e3a\u5b83\u4eec\u662fRust\u5f02\u6b65\u7f16\u7a0b\u7684\u57fa\u77f3\u3002\u8fd9\u4e9b\u6784\u9020\u88ab\u7f16\u8bd1\u6210\u72b6\u6001\u673a\u662fRust\u5f02\u6b65\u751f\u6001\u4e2d\u7684\u4e00\u4e2a\u6838\u5fc3\u7279\u6027\u3002<\/strong> \u5f53\u7f16\u8bd1\u5668\u9047\u5230 async<\/code> \u4ee3\u7801\u5757\u6216 async fn<\/code> \u65f6\uff0c\u5b83\u4f1a\u5c06\u8fd9\u4e9b\u6784\u9020\u8f6c\u6362\u6210\u5b9e\u73b0\u4e86 Future<\/code> trAI<\/a>t\u7684\u72b6\u6001\u673a\u3002\u8fd9\u6837\u7684\u8f6c\u6362\u5141\u8bb8\u5b83\u4eec\u5728\u975e\u963b\u585e\u7684\u6267\u884c\u8fc7\u7a0b\u4e2d\u6682\u505c\u548c\u6062\u590d\u6267\u884c\u3002<\/p>\n<\/p>\n

\u5177\u4f53\u800c\u8a00\uff0c\u5f53async<\/code> \u4ee3\u7801\u5757\u6216\u51fd\u6570\u88ab\u8c03\u7528\u65f6\uff0c\u5e76\u4e0d\u4f1a\u7acb\u5373\u6267\u884c\u91cc\u9762\u7684\u4ee3\u7801\u3002\u76f8\u53cd\uff0c\u5b83\u4eec\u4f1a\u8fd4\u56de\u4e00\u4e2aFuture<\/code>\uff0c\u8be5Future<\/code>\u5728\u88ab.await<\/code>\u8c03\u7528\u65f6\u624d\u5f00\u59cb\u6267\u884c\u3002\u5728\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6bcf\u6b21\u9047\u5230 .await<\/code>\uff0c\u6267\u884c\u5c31\u4f1a\u6682\u505c\uff0c\u5c06\u63a7\u5236\u6743\u8fd4\u56de\u7ed9\u8c03\u7528\u8005\uff0c\u76f4\u5230\u7b49\u5f85\u7684Future<\/code>\u51c6\u5907\u597d\u518d\u7ee7\u7eed\u6267\u884c\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u6b63\u662f\u901a\u8fc7\u72b6\u6001\u673a\u7684\u8f6c\u6362\u6765\u5b9e\u73b0\u7684\u3002<\/strong><\/p>\n<\/p>\n

\u4e00\u3001 \u7406\u89e3RUST\u7684ASYNC\u548cAWAIT<\/h3>\n<\/p>\n

async<\/code>\u548cawait<\/code>\u662fRust\u7528\u4e8e\u5b9e\u73b0\u975e\u963b\u585e\u5f02\u6b65\u7f16\u7a0b\u7684\u5173\u952e\u5173\u952e\u5b57\u3002\u4f7f\u7528async<\/code>\u5173\u952e\u5b57\u6807\u8bb0\u7684\u51fd\u6570\u6216\u4ee3\u7801\u5757\u5c06\u8fd4\u56de\u4e00\u4e2aFuture<\/code>\u3002await<\/code>\u7528\u4e8e\u7b49\u5f85\u4e00\u4e2aFuture<\/code>\u5b8c\u6210\u5e76\u83b7\u53d6\u5176\u7ed3\u679c\uff0c\u800c\u4e0d\u4f1a\u963b\u585e\u5f53\u524d\u7ebf\u7a0b\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u7f16\u8bd1\u5668\u7684\u89d2\u8272\u81f3\u5173\u91cd\u8981\uff0c\u5b83\u5c06\u8fd9\u4e9basync<\/code>\u51fd\u6570\u6216\u4ee3\u7801\u5757\u8f6c\u6362\u6210\u4e00\u79cd\u80fd\u591f\u88ab\u6682\u505c\u548c\u6062\u590d\u7684\u5f62\u5f0f\uff0c\u5373\u72b6\u6001\u673a\u3002\u8fd9\u79cd\u8f6c\u6362\u4f7f\u5f97Rust\u80fd\u591f\u6267\u884c\u975e\u963b\u585e\u7684\u5f02\u6b65\u4ee3\u7801\uff0c\u5b9e\u73b0\u9ad8\u6548\u7684\u5e76\u53d1\u7f16\u7a0b\u3002<\/p>\n<\/p>\n

\u4e8c\u3001 FROM ASYNC CODE TO STATE MACHINES<\/h3>\n<\/p>\n

\u8ba9\u6211\u4eec\u6df1\u5165\u7406\u89e3Rust\u662f\u5982\u4f55\u5c06async<\/code>\u4ee3\u7801\u5757\u6216\u51fd\u6570\u8f6c\u5316\u4e3a\u72b6\u6001\u673a\u7684\u3002\u9996\u5148\uff0c\u6bcf\u4e2a async<\/code> \u6807\u8bb0\u7684\u4ee3\u7801\u5757\u6216\u51fd\u6570\u5728\u7f16\u8bd1\u65f6\u90fd\u4f1a\u88ab\u8f6c\u6362\u6210\u4e00\u4e2a\u5b9e\u73b0\u4e86Future<\/code> trait\u7684\u7ed3\u6784\u4f53\u3002\u8fd9\u4e2a\u7ed3\u6784\u4f53\u7ef4\u62a4\u7740\u6267\u884c\u5230\u7684\u4f4d\u7f6e\u3001\u5c40\u90e8\u53d8\u91cf\u548c\u5176\u4ed6\u72b6\u6001\u4fe1\u606f\u3002<\/p>\n<\/p>\n

    \n
  1. \u72b6\u6001\u7684\u8868\u793a<\/strong>: \u7b2c\u4e00\u6b65\u662f\u5c06async<\/code>\u4ee3\u7801\u7684\u6bcf\u4e00\u4e2a\u53ef\u80fd\u7684\u6267\u884c\u70b9\u8f6c\u6362\u6210\u72b6\u6001\u673a\u4e2d\u7684\u4e00\u4e2a\u72b6\u6001\u3002\u8fd9\u5305\u542b\u4e86\u51fd\u6570\u5165\u53e3\u3001\u6bcf\u4e00\u4e2a.await<\/code>\u70b9\u4ee5\u53ca\u51fd\u6570\u8fd4\u56de\u3002\u6bcf\u5f53\u4ee3\u7801\u6267\u884c\u5230\u4e00\u4e2a.await<\/code>\u65f6\uff0c\u72b6\u6001\u673a\u5c31\u4f1a\u8bb0\u5f55\u5f53\u524d\u72b6\u6001\u5e76\u8fd4\u56de\uff0c\u7b49\u5f85\u88ab\u518d\u6b21\u5524\u990a\u7ee7\u7eed\u6267\u884c\u3002<\/li>\n
  2. \u8f6c\u6362\u8fc7\u7a0b<\/strong>: \u5728\u7f16\u8bd1\u9636\u6bb5\uff0cRust\u7f16\u8bd1\u5668\u5206\u6790async<\/code>\u4ee3\u7801\uff0c\u627e\u51fa\u6240\u6709\u5f02\u6b65\u7b49\u5f85\u70b9\uff0c\u6839\u636e\u8fd9\u4e9b\u7b49\u5f85\u70b9\u6784\u5efa\u72b6\u6001\u673a\u3002\u8fd9\u4e2a\u72b6\u6001\u673a\u5728\u8fd0\u884c\u65f6\u7528\u4e8e\u63a7\u5236\u6d41\u7a0b\u7684\u6302\u8d77\u4e0e\u6062\u590d\u3002<\/li>\n<\/ol>\n

    \u4e09\u3001 \u5b9e\u73b0FUTURE TRAIT\u7684\u72b6\u6001\u673a<\/h3>\n<\/p>\n

    \u8fd9\u4e2a\u8f6c\u5316\u540e\u7684\u72b6\u6001\u673a\uff0c\u9664\u4e86\u6301\u6709\u6267\u884c\u4e0a\u4e0b\u6587\u5916\uff0c\u8fd8\u5b9e\u73b0\u4e86Future<\/code> trait\u3002\u8fd9\u610f\u5473\u7740\u5b83\u5177\u6709.poll<\/code>\u65b9\u6cd5\uff0c\u5f53\u8c03\u7528\u6b64\u65b9\u6cd5\u65f6\uff0c\u72b6\u6001\u673a\u4f1a\u6839\u636e\u5185\u90e8\u8bb0\u5f55\u7684\u5f53\u524d\u72b6\u6001\u6765\u51b3\u5b9a\u4e0b\u4e00\u6b65\u64cd\u4f5c\u3002<\/p>\n<\/p>\n

      \n
    1. Poll\u8c03\u7528<\/strong>: \u6bcf\u6b21Future::poll<\/code>\u88ab\u8c03\u7528\u65f6\uff0c\u72b6\u6001\u673a\u68c0\u67e5\u81ea\u5df1\u7684\u5f53\u524d\u72b6\u6001\uff0c\u5e76\u51b3\u5b9a\u662f\u7ee7\u7eed\u6267\u884c\u5230\u4e0b\u4e00\u4e2a.await<\/code>\uff0c\u8fd8\u662f\u5f53\u524d\u7b49\u5f85\u7684Future<\/code>\u8fd8\u672a\u5c31\u7eea\uff0c\u9700\u8981\u518d\u6b21\u6302\u8d77\u3002<\/li>\n
    2. \u72b6\u6001\u8f6c\u6362<\/strong>: \u91cd\u8981\u7684\u662f\uff0c\u8fd9\u4e2a\u8f6c\u6362\u8fc7\u7a0b\u662f\u81ea\u52a8\u53d1\u751f\u7684\u3002Rust\u7f16\u8bd1\u5668\u8d1f\u8d23\u5206\u6790async<\/code>\u4ee3\u7801\uff0c\u5e76\u5c06\u5176\u81ea\u52a8\u8f6c\u6362\u4e3a\u5b9e\u73b0\u4e86Future<\/code> trait\u7684\u72b6\u6001\u673a\u7ed3\u6784\u4f53\u3002<\/li>\n<\/ol>\n

      \u56db\u3001 ASYNC\u51fd\u6570\u548c\u4ee3\u7801\u5757\u5982\u4f55\u5b9e\u73b0\u975e\u963b\u585e\u884c\u4e3a<\/h3>\n<\/p>\n

      \u901a\u8fc7\u5bf9async<\/code> \u51fd\u6570\u548c\u4ee3\u7801\u5757\u7684\u7f16\u8bd1\u8f6c\u6362\uff0cRust\u53ef\u4ee5\u5b9e\u73b0\u771f\u6b63\u7684\u975e\u963b\u585e\u5f02\u6b65\u6267\u884c\u3002\u8fd9\u662f\u56e0\u4e3a\u751f\u6210\u7684\u72b6\u6001\u673a\u80fd\u591f\u5728\u6bcf\u4e2a\u6302\u8d77\u70b9\u4fdd\u5b58\u5176\u72b6\u6001\uff0c\u5e76\u5728Future\u518d\u6b21\u88abpoll\u65f6\u4ece\u4fdd\u5b58\u7684\u72b6\u6001\u7ee7\u7eed\u6267\u884c\uff0c\u800c\u4e0d\u662f\u4ece\u5934\u5f00\u59cb\u3002<\/p>\n<\/p>\n

        \n
      1. \u975e\u963b\u585e\u7279\u6027<\/strong>: \u8fd9\u79cd\u57fa\u4e8e\u72b6\u6001\u673a\u7684\u5b9e\u73b0\u610f\u5473\u7740Rust\u7684\u5f02\u6b65\u6267\u884c\u975e\u5e38\u9ad8\u6548\u3002\u5b83\u5141\u8bb8\u540c\u65f6\u6267\u884c\u591a\u4e2a\u64cd\u4f5c\uff0c\u800c\u4e0d\u4f1a\u963b\u585e\u7ebf\u7a0b\uff0c\u8fdb\u800c\u63d0\u9ad8\u4e86\u8d44\u6e90\u7684\u5229\u7528\u7387\u548c\u5e94\u7528\u6027\u80fd\u3002<\/li>\n
      2. \u6548\u7387\u7684\u63d0\u5347<\/strong>: \u901a\u8fc7\u5141\u8bb8\u7ebf\u7a0b\u5728\u7b49\u5f85I\/O\u64cd\u4f5c\u6216\u5176\u4ed6\u957f\u671f\u4efb\u52a1\u7684\u5b8c\u6210\u65f6\u6267\u884c\u5176\u4ed6\u4efb\u52a1\uff0cRust\u7684\u8fd9\u79cd\u5f02\u6b65\u6a21\u578b\u663e\u8457\u63d0\u9ad8\u4e86\u5e76\u53d1\u6027\u548c\u54cd\u5e94\u80fd\u529b\u3002<\/li>\n<\/ol>\n

        \u4e94\u3001 \u603b\u7ed3<\/h3>\n<\/p>\n

        \u5728Rust\u4e2d\uff0casync<\/code>\u4ee3\u7801\u5757\u548casync fn<\/code>\u901a\u8fc7\u7f16\u8bd1\u5668\u8f6c\u6362\u6210\u72b6\u6001\u673a\uff0c\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u5f02\u6b65\u652f\u6301\u3002\u8fd9\u79cd\u8bbe\u8ba1\u4e0d\u4ec5\u4f7f\u5f97\u5f02\u6b65\u4ee3\u7801\u7684\u5199\u4f5c\u548c\u7406\u89e3\u66f4\u52a0\u76f4\u89c2\uff0c\u800c\u4e14\u901a\u8fc7\u975e\u963b\u585e\u7684\u6267\u884c\u6a21\u578b\uff0c\u6781\u5927\u5730\u63d0\u9ad8\u4e86\u5e94\u7528\u7684\u6548\u7387\u548c\u6027\u80fd\u3002Rust\u7684\u8fd9\u4e00\u5f02\u6b65\u7f16\u7a0b\u6a21\u578b\u662f\u73b0\u4ee3\u8f6f\u4ef6\u5f00\u53d1\u4e2d\u5e76\u53d1\u5904\u7406\u7684\u5f3a\u5927\u5de5\u5177\uff0c\u4e3a\u5f00\u53d1\u9ad8\u6027\u80fd\u7684\u7cfb\u7edf\u8f6f\u4ef6\u548c\u5e94\u7528\u63d0\u4f9b\u4e86\u5f3a\u529b\u652f\u6301\u3002<\/p>\n<\/p>\n

        \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

        1. \u5982\u4f55\u5728Rust\u4e2d\u5c06async\u4ee3\u7801\u5757\u548casync fn\u7f16\u8bd1\u6210\u72b6\u6001\u673a?<\/strong>
        \n\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1Rust\u7684async\u4ee3\u7801\u5757\u548casync fn\u65f6\uff0c\u4f1a\u5c06\u5176\u8f6c\u6362\u4e3a\u72b6\u6001\u673a\u3002\u8fd9\u662f\u4e3a\u4e86\u5b9e\u73b0\u5f02\u6b65\u7f16\u7a0b\u7684\u7279\u6027\u3002\u5728\u7f16\u8bd1\u8fc7\u7a0b\u4e2d\uff0c\u7f16\u8bd1\u5668\u4f1a\u5c06async\u4ee3\u7801\u5757\u6216async fn\u7684\u6267\u884c\u6d41\u7a0b\u5206\u89e3\u4e3a\u591a\u4e2a\u72b6\u6001\uff0c\u5e76\u4f7f\u7528\u72b6\u6001\u53d8\u91cf\u6765\u8bb0\u5f55\u5f53\u524d\u6267\u884c\u7684\u72b6\u6001\u3002<\/p>\n

        2. Rust\u7f16\u8bd1\u5668\u662f\u5982\u4f55\u5c06async\u4ee3\u7801\u5757\u548casync fn\u8f6c\u6362\u4e3a\u72b6\u6001\u673a\u7684?<\/strong>
        \n\u7f16\u8bd1\u5668\u4f7f\u7528\u4e86\u4e00\u79cd\u79f0\u4e3a"desugaring"\u7684\u6280\u672f\uff0c\u5c06async\u4ee3\u7801\u5757\u548casync fn\u8f6c\u6362\u4e3a\u72b6\u6001\u673a\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u7f16\u8bd1\u5668\u4f1a\u521b\u5efa\u4e00\u4e2aFuture<\/code>\u7c7b\u578b\u7684\u7ed3\u6784\u4f53\u6765\u8868\u793a\u72b6\u6001\u673a\uff0c\u5e76\u5728\u5176\u4e2d\u5b9a\u4e49\u4e00\u4e2apoll<\/code>\u65b9\u6cd5\u6765\u6267\u884c\u72b6\u6001\u8f6c\u6362\u3002<\/p>\n

        3. \u72b6\u6001\u673a\u662f\u5982\u4f55\u5728Rust\u4e2d\u5b9e\u73b0\u5f02\u6b65\u7f16\u7a0b\u7684?<\/strong>
        \n\u72b6\u6001\u673a\u5728Rust\u4e2d\u5b9e\u73b0\u5f02\u6b65\u7f16\u7a0b\u7684\u5173\u952e\u5728\u4e8e\u5176\u6267\u884c\u8fc7\u7a0b\u53ef\u4ee5\u88ab\u4e2d\u65ad\u548c\u6062\u590d\uff0c\u4ece\u800c\u5141\u8bb8\u5176\u4ed6\u4efb\u52a1\u5728\u5f53\u524d\u4efb\u52a1\u7b49\u5f85\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\u65f6\u7ee7\u7eed\u6267\u884c\u3002\u5f53\u4e00\u4e2a\u5f02\u6b65\u64cd\u4f5c\u963b\u585e\u65f6\uff0c\u72b6\u6001\u673a\u4f1a\u8fd4\u56de\u4e00\u4e2a\u672a\u51b3\u7684\u503c\uff0c\u7136\u540e\u4ea4\u51fa\u6267\u884c\u6743\u3002\u5f53\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\u540e\uff0c\u72b6\u6001\u673a\u4f1a\u88ab\u91cd\u65b0\u8c03\u5ea6\uff0c\u7ee7\u7eed\u4ece\u88ab\u4e2d\u65ad\u7684\u5730\u65b9\u7ee7\u7eed\u6267\u884c\u3002<\/p>\n

        \u901a\u8fc7\u5c06async\u4ee3\u7801\u5757\u548casync fn\u8f6c\u6362\u4e3a\u72b6\u6001\u673a\uff0cRust\u5b9e\u73b0\u4e86\u7b80\u6d01\u9ad8\u6548\u7684\u5f02\u6b65\u7f16\u7a0b\u6a21\u578b\uff0c\u4f7f\u5f00\u53d1\u8005\u53ef\u4ee5\u66f4\u52a0\u65b9\u4fbf\u5730\u5e76\u53d1\u6267\u884c\u591a\u4e2a\u5f02\u6b65\u4efb\u52a1\uff0c\u4ece\u800c\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6027\u80fd\u548c\u53ef\u4f38\u7f29\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Rust\u4e2d\uff0casync \u4ee3\u7801\u5757\u548c async fn \u975e\u5e38\u5173\u952e\uff0c\u56e0\u4e3a\u5b83\u4eec\u662fRust\u5f02\u6b65\u7f16\u7a0b\u7684\u57fa\u77f3\u3002\u8fd9\u4e9b\u6784\u9020\u88ab\u7f16 […]","protected":false},"author":3,"featured_media":266700,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/266686"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=266686"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/266686\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/266700"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=266686"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=266686"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=266686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}