{"id":2074,"date":"2024-04-07T21:21:40","date_gmt":"2024-04-07T13:21:40","guid":{"rendered":"https:\/\/flandre-scarlet.moe\/blog\/?p=2074"},"modified":"2024-04-07T23:05:19","modified_gmt":"2024-04-07T15:05:19","slug":"c-%e5%bc%82%e6%ad%a5%e7%bc%96%e7%a8%8b%e6%a1%86%e6%9e%b6","status":"publish","type":"post","link":"https:\/\/flandre-scarlet.moe\/blog\/2074\/","title":{"rendered":"C++ \u5f02\u6b65\u7f16\u7a0b\u6846\u67b6"},"content":{"rendered":"<p>\u4e4b\u524d\u516c\u53f8\u9879\u76ee\u4e2d\u4e00\u76f4\u6ca1\u6709\u65b9\u4fbf\u597d\u7528\u7684\u5f02\u6b65\u7f16\u7a0b\u6846\u67b6\uff0c\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u4f1a\u9047\u5230\u4e00\u4e9b\u95ee\u9898\u3002\u6bd4\u5982\u591a\u7ebf\u7a0b\u7f16\u7801\u65f6\u5f00\u53d1\u9700\u8981\u81ea\u5df1\u7ba1\u7406\u7ebf\u7a0b\uff0c\u5e76\u5728\u4e24\u4fa7\u540c\u6b65\u6570\u636e\u3002\u4e00\u4e9b\u64cd\u4f5c\u4e5f\u4f1a\u88ab\u76f4\u63a5\u653e\u5728\u4e3b\u7ebf\u7a0b\u4e2d\uff0c\u5c31\u7b97\u5355\u4e2a\u64cd\u4f5c\u7684\u8017\u65f6\u5e76\u4e0d\u660e\u663e\uff0c\u957f\u6b64\u4ee5\u5f80\u4e5f\u4f1a\u79ef\u5c11\u6210\u591a\uff0c\u6700\u7ec8\u62d6\u6162\u4e86 UI \u7684\u901f\u5ea6\u3002<\/p>\n<p>\u4f46\u597d\u5728\u516c\u53f8\u7684\u4ee3\u7801\u5e93\u5df2\u7ecf\u652f\u6301 C++11\uff0c\u6211\u4eec\u57fa\u4e8e C++11 \u5f00\u53d1\u4e86\u4e00\u4e2a\u4ec5\u4f7f\u7528\u6807\u51c6\u5e93\u7684\u6846\u67b6\u3002\u8fd9\u6837\u65e2\u80fd\u7b80\u5316\u4e1a\u52a1\u5f00\u53d1\u65f6\u7684\u4ee3\u7801\u5de5\u4f5c\u91cf\uff0c\u4e5f\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\uff0c\u800c\u4e14\u4f7f\u7528 std \u7ec4\u4ef6\u5b9e\u73b0\u4e5f\u65b9\u4fbf\u652f\u6301\u6240\u6709\u5e73\u53f0\u3002\u66f4\u8fdb\u4e00\u6b65\u7684\u8bdd\u8fd8\u53ef\u4ee5\u7ed9\u6846\u67b6\u52a0\u5165\u5176\u4ed6\u652f\u6301\uff0c\u5982\uff1a<\/p>\n<ul>\n<li>task \u4f18\u5148\u7ea7<\/li>\n<li>task \u5ef6\u8fdf\u8c03\u7528\u3001\u91cd\u590d\u8c03\u7528\uff0c\u5e76\u53ef\u81ea\u5b9a\u4e49\u8c03\u7528\u95f4\u9694\u7b49\u5c5e\u6027<\/li>\n<li>\u6307\u5b9a\u591a\u4e2a task \u5728\u540c\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u8fd0\u884c<\/li>\n<\/ul>\n<p><!--more--><\/p>\n<h2>\u57fa\u672c\u7ed3\u6784<\/h2>\n<p>\u663e\u7136\u6bcf\u4e2a task \u5f00\u4e00\u4e2a\u7ebf\u7a0b\u975e\u5e38\u4e0d\u73af\u4fdd\uff0c\u6240\u4ee5\u9996\u5148\u9700\u8981\u5b9e\u73b0\u4e00\u4e2a\u57fa\u672c\u7684\u7ebf\u7a0b\u6c60\u3002\u4e0d\u5230 100 \u884c\u5c31\u53ef\u4ee5\u641e\u5b9a\u4e00\u4e2a\u7eaf\u5934\u6587\u4ef6\u7684\u7b80\u5355\u5b9e\u73b0 <a href=\"https:\/\/github.com\/progschj\/ThreadPool\/blob\/master\/ThreadPool.h\" rel=\"noopener\" target=\"_blank\">ThreadPool<\/a>\u3002\u4f7f\u7528\u65b9\u6cd5\u4e5f\u975e\u5e38\u7b80\u5355\uff0c\u53c2\u89c1\u9879\u76ee\u7684\u4ecb\u7ecd\u5373\u53ef\u3002<\/p>\n<p>\u901a\u5e38\u5ba2\u6237\u7aef\u7a0b\u5e8f\u9664\u4e86 UI \u5904\u7406\u5916\uff0c\u5927\u591a\u7684\u4e1a\u52a1\u903b\u8f91\u4e5f\u4f1a\u653e\u5728\u4e3b\u7ebf\u7a0b\u4e00\u8d77\u6267\u884c\u3002\u6240\u4ee5\u6bd4\u8f83\u5e38\u89c1\u7684\u6a21\u5f0f\u662f\u5728\u4e3b\u7ebf\u7a0b\u63d0\u4ea4\u4e00\u4e2a\u8017\u65f6\u64cd\u4f5c\u5230\u5de5\u4f5c\u7ebf\u7a0b\uff0c\u5f53\u4efb\u52a1\u5b8c\u6210\u540e\u518d\u56de\u5230\u4e3b\u7ebf\u7a0b\u505a\u4e0b\u4e00\u6b65\u7684\u5904\u7406\u3002\u9664\u975e\u9879\u76ee\u91cc\u5176\u4ed6\u7ec4\u4ef6\u90fd\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u5426\u5219\u5728\u5de5\u4f5c\u7ebf\u7a0b\u91cc\u76f4\u63a5\u505a\u540e\u7eed\u64cd\u4f5c\uff08\u6bd4\u5982\u540c\u6b65\u6570\u636e\u72b6\u6001\u7b49\uff09\u90fd\u53ef\u80fd\u4f1a\u5f15\u53d1\u7ade\u6001\u6761\u4ef6\uff0c\u6240\u4ee5\u8fd9\u91cc\u9ed8\u8ba4\u90fd\u8ba9\u4e3b\u7ebf\u7a0b\u53bb\u5b8c\u6210\u8fd9\u4e9b\u903b\u8f91\u64cd\u4f5c\u3002<\/p>\n<p>\u800c\u4e14\u4e5f\u4e0d\u53ef\u80fd\u8ba9 UI \u7ebf\u7a0b\/\u4e3b\u7ebf\u7a0b\u53bb\u505a\u540c\u6b65\u7b49\u5f85\uff0c\u6240\u4ee5\u4f1a\u5728 UI \u7ebf\u7a0b\u505a OnIdle \u5904\u7406\u65f6\u4f1a\u52a0\u5165\u4e00\u4e2a\u5bf9\u5b8c\u6210\u961f\u5217\u7684\u68c0\u67e5\uff0c\u5f53\u4efb\u52a1\u5b8c\u6210\u540e\u7ed3\u679c\u88ab post \u5230\u5b8c\u6210\u961f\u5217\u91cc\u65f6\uff0c\u4e3b\u7ebf\u7a0b\u518d\u53bb\u53d6\u51fa\u6765\u6267\u884c\u540e\u7eed\u6b65\u9aa4\u3002<\/p>\n<p>PS\uff1a\u5728 windows \u5e73\u53f0\u4e0a\u53ef\u4ee5\u5229\u7528 UI \u7ebf\u7a0b\u7684\u6d88\u606f\u5faa\u73af\uff0c\u81ea\u5b9a\u4e49\u4e00\u4e2a\u6d88\u606f\u5e76\u5c06\u7ed3\u679c\u7528 PostMessage \u4f20\u8fc7\u53bb\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u4f18\u5316\u6389 OnIdle \u65f6\u7684\u961f\u5217\u68c0\u67e5\uff0c\u5904\u7406\u4f1a\u66f4\u52a0\u9ad8\u6548\uff0c\u4f46\u8fd9\u6837\u7684\u8bdd\u5176\u4ed6\u5e73\u53f0\u9700\u8981\u505a\u7c7b\u4f3c\u7684\u9002\u914d\uff0c\u7528\u81ea\u8eab\u5e73\u53f0\u7684\u673a\u5236\u5b9e\u73b0\u540c\u6837\u6548\u679c\u3002<\/p>\n<p>\u57fa\u4e8e\u8fd9\u4e2a\u7ebf\u7a0b\u6c60\uff0c\u6211\u4eec\u53ef\u4ee5\u5feb\u901f\u641e\u51fa\u4e00\u4e2a\u63d0\u4ea4\u4efb\u52a1\u5904\u7406\u7684\u57fa\u672c\u7ed3\u6784\uff1a<\/p>\n<pre class=\"brush: cpp; title: ; notranslate\" title=\"\">\r\n\/\/\r\n\/\/ \u5b9a\u4e49\u4e00\u4e2a\u7ebf\u7a0b\u6c60\uff0c\u5168\u5c40\u6216\u8005\u662f\u5728\u7279\u5b9a\u8303\u56f4\u7684\u7c7b\u91cc\u5747\u53ef\uff0c\u540c\u65f6\u8bbe\u7f6e\u597d\u6700\u5927\u7ebf\u7a0b\u6570\r\n\/\/\r\nThreadPool th_pool_(5);  \/\/ \u6307\u5b9a\u6c60\u91cc\u7684\u6700\u5927\u7ebf\u7a0b\u6570\uff0c\u8fd9\u91cc\u968f\u4fbf\u5199\u4e86\u4e2a 5\r\nThreadSafeQueue&lt;std::packaged_task&lt;void()&gt;&gt; completed_queue_;  \/\/ \u5b8c\u6210\u961f\u5217\uff0c\u7528\u6765\u5b58\u653e\u9700\u8981\u4e3b\u7ebf\u7a0b\u505a\u540e\u7eed\u5904\u7406\u7684 task\r\n\r\n\/\/\r\n\/\/ \u5728\u4efb\u4f55\u9700\u8981\u7684\u5730\u65b9\u5c06 task \u63d0\u4ea4\u5230\u7ebf\u7a0b\u6c60\u4e2d\u8fd0\u884c\r\n\/\/\r\nvoid Panel::OnButtonClick() {\r\n\u00a0\u00a0\/\/ ... \u5176\u4ed6\u4ee3\u7801\r\n\u00a0\u00a0std::string full_path = ...;\r\n\u00a0\u00a0th_pool_.enqueue(&#x5B;this, full_path]() {\r\n\u00a0\u00a0\u00a0\u00a0\/\/ \u4ee5\u4e0b\u4ee3\u7801\u90fd\u5728\u5de5\u4f5c\u7ebf\u7a0b\u4e2d\u6267\u884c\r\n\r\n\u00a0\u00a0\u00a0\u00a0\/\/ \u505a\u4e00\u4e9b\u8017\u65f6\u64cd\u4f5c\uff0c\u6bd4\u5982\u8bfb\u5199\u6587\u4ef6\u7b49\r\n\u00a0\u00a0\u00a0\u00a0auto result = LoadData(full_path);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\/\/ \u5de5\u4f5c\u7ebf\u7a0b\u90e8\u5206\u7684\u64cd\u4f5c\u7ed3\u675f\u540e\u5728\u4e3b\u7ebf\u7a0b\u8fdb\u884c\u540e\u7eed\u64cd\u4f5c\uff0c\u6bd4\u5982\u901a\u77e5\u5176\u4ed6\u7ec4\u4ef6\u64cd\u4f5c\u7ed3\u679c\uff0c\r\n\u00a0\u00a0\u00a0\u00a0\/\/ \u5237\u65b0 UI \u7b49\uff0c\u9700\u8981\u65b0\u5efa\u4e00\u4e2a task \u5e76 post \u7ed9\u4e3b\u7ebf\u7a0b\r\n\u00a0\u00a0\u00a0\u00a0auto ptask = std::make_shared&lt;std::packaged_task&lt;void()&gt;&gt;(&#x5B;this, result]() {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/ \u8fd9\u4e2a lambda \u5185\u7684\u4ee3\u7801\u4f1a\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u6267\u884c\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0log::info(&quot;save data result: &quot; &lt;&lt; result);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if (this-&gt;sink_)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this-&gt;sink_-&gt;OnDataLoaded(result);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0UpdateLabel();\r\n\u00a0\u00a0\u00a0\u00a0});\r\n\u00a0\u00a0\u00a0\u00a0\/\/ \u5c06\u4e0b\u4e00\u6b65\u7684 task \u653e\u5230\u5b8c\u6210\u961f\u5217\u4e2d\u7b49\u5f85\u4e3b\u7ebf\u7a0b\u6267\u884c\r\n\u00a0\u00a0\u00a0\u00a0completed_queue_.push(ptask);\r\n\u00a0\u00a0});\r\n}\r\n\r\n\/\/\r\n\/\/ \u4e3b\u7ebf\u7a0b\u7684 OnIdle \u51fd\u6570\r\n\/\/\r\nvoid OnIdle() {\r\n\u00a0\u00a0\/\/ ... \u5176\u4ed6\u64cd\u4f5c\r\n\u00a0\u00a0std::shared_ptr&lt;std::packaged_task&lt;void()&gt;&gt; tmp;\r\n\u00a0\u00a0while (finished_task_queue_.try_pop(tmp) &amp;&amp; tmp) {\r\n\u00a0\u00a0\u00a0\u00a0(*tmp)();\r\n\u00a0\u00a0}\r\n}\r\n<\/pre>\n<p>\u8fd9\u91cc\u7528\u4e86 packaged_task\u3001future\u3001thread\u00a0\u7b49\u6765\u5b9e\u73b0\u7b80\u5355\u7684\u5f02\u6b65\u548c\u56de\u8c03\u5904\u7406\uff0c\u5c06 callback \u5199\u6210 lambda \u8fd9\u6837\u540e\u7eed\u7684\u903b\u8f91\u5c31\u4e00\u76ee\u4e86\u7136\uff0c\u4e0d\u7528\u518d\u5230\u4ee3\u7801\u91cc\u4e1c\u7ffb\u897f\u627e\u4e86\u3002<\/p>\n<h2>\u5c01\u88c5\u51fd\u6570\u5bf9\u8c61<\/h2>\n<p>\u5b9e\u9645\u5b9e\u73b0\u4e2d\u6211\u4eec\u4e0d\u4f1a\u76f4\u63a5\u5c06\u4efb\u52a1\u63d0\u4ea4\u5230\u7ebf\u7a0b\u6c60\uff0c\u800c\u662f\u589e\u52a0\u4e00\u4e2a\u95f4\u63a5\u5c42\u6bd4\u5982 TaskRunner\uff0c\u7528\u6765\u5904\u7406\u4efb\u52a1\u8c03\u5ea6\uff0c\u8ddf\u7531\u7cfb\u7edf\u8c03\u5ea6\u5668\u9ed8\u8ba4\u5b89\u6392\u7ebf\u7a0b\u6765\u6267\u884c task \u76f8\u6bd4\u6709\u66f4\u9ad8\u7684\u7075\u6d3b\u5ea6\u3002\u6bd4\u5982\u5c06\u4e00\u4e9b task \u5b89\u6392\u5230\u540c\u4e00\u4e2a\u7ebf\u7a0b\u3001\u4f4e\u8d1f\u8f7d\u60c5\u51b5\u4e0b\u5c3d\u53ef\u80fd\u5730\u5524\u9192\u540c\u4e00\u4e2a\u7ebf\u7a0b\u6765\u5904\u7406 task \u7b49\u3002<\/p>\n<p>\u5b9e\u73b0 task \u7684\u4f18\u5148\u7ea7\u3001\u5ef6\u65f6\u3001\u91cd\u590d\u6267\u884c\u4e5f\u6bd4\u8f83\u5bb9\u6613\uff0c\u53ea\u8981\u5b9a\u4e49\u4e00\u4e2a Task \u7c7b\uff0c\u5c06\u5916\u90e8\u63d0\u4ea4\u7684 lambda \u7b49\u53ef\u6267\u884c\u5bf9\u8c61\u548c\u4f18\u5148\u7ea7\u7b49\u5c5e\u6027\u4e00\u8d77\u6253\u5305\u4fdd\u5b58\uff0c\u7136\u540e\u653e\u5230 TaskRunner \u7684\u4f18\u5148\u961f\u5217\u91cc\uff0c\u518d\u628a\u961f\u5217\u91cc\u7684\u4efb\u52a1\u5206\u914d\u7ed9\u7ebf\u7a0b\u6c60\u6267\u884c\u5c31\u53ef\u4ee5\u3002\u91cd\u590d\u7684\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u540e\u518d\u6b21\u5165\u961f\u5373\u53ef\u3002<\/p>\n<p>\u52a0\u5165 TaskRunner \u7684\u5c01\u88c5\u4e5f\u53ef\u4ee5\u8ba9\u4e3b\u7ebf\u7a0b\u53d8\u6210\u201cWorker Thread\u201d\u4e4b\u4e00\uff0c\u5bf9\u6846\u67b6\u6765\u8bb2\u6240\u6709\u7ebf\u7a0b\u90fd\u53ef\u4ee5\u4e00\u89c6\u540c\u4ec1\u4e86\u3002<\/p>\n<h2>\u53d6\u6d88 Task<\/h2>\n<p>Task \u7684\u53d6\u6d88\u64cd\u4f5c\u4e5f\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u5b9e\u9645\u4f7f\u7528\u4e2d\u6211\u4eec\u5927\u6982\u7387\u4f1a\u628a\u7c7b\u5bf9\u8c61\u7684 this \u6307\u9488\u4f20\u5165\uff0c\u65b9\u4fbf\u5728 task \u6267\u884c\u8fc7\u7a0b\u4e2d\u5373\u65f6\u66f4\u65b0\u72b6\u6001\u7b49\uff0c\u6216\u8005 task \u6267\u884c\u5b8c\u540e\u8c03\u7528\u67d0\u4e2a\u5145\u5f53 callback \u7684\u6210\u5458\u51fd\u6570\u3002\u90a3\u8fd9\u6837\u80af\u5b9a\u4f1a\u9047\u5230 task \u8fd8\u6ca1\u6267\u884c\uff0c\u7c7b\u5bf9\u8c61\u5c31\u8981\u88ab\u6790\u6784\u7684\u60c5\u51b5\uff1b\u6216\u8005\u4f20\u5165\u67d0\u4e2a lambda \u8868\u8fbe\u5f0f\uff0c\u4f46\u662f\u5728\u51fd\u6570\u88ab\u6267\u884c\u524d\u52a8\u6001\u5e93\u5c31\u8981\u88ab\u5378\u8f7d\u4e86\u3002\u5728\u8fd9\u4e4b\u524d\u5c31\u5fc5\u987b\u8981\u53d6\u6d88 task\uff0c\u514d\u5f97\u5230\u65f6\u5019\u4e0d\u4f53\u9762\u3002<\/p>\n<p>\u4f46\u662f\u8981\u53d6\u6d88\u5df2\u7ecf\u5f00\u59cb\u6267\u884c\u7684 task 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