{"id":206178,"date":"2025-06-12T13:41:29","date_gmt":"2025-06-12T05:41:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206178\/"},"modified":"2025-06-12T13:41:29","modified_gmt":"2025-06-12T05:41:29","slug":"go-%e4%b8%ad%e5%a6%82%e4%bd%95%e5%bb%b6%e8%bf%9f%e6%89%a7%e8%a1%8c%e5%8f%96%e6%b6%88%e4%ba%8b%e4%bb%b6%e6%93%8d%e4%bd%9c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206178\/","title":{"rendered":"Go \u4e2d\u5982\u4f55\u5ef6\u8fdf\u6267\u884c\u53d6\u6d88\u4e8b\u4ef6\u64cd\u4f5c\uff1f"},"content":{"rendered":"<p>\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aGo \u4e2d\u5982\u4f55\u5ef6\u8fdf\u6267\u884c\u53d6\u6d88\u4e8b\u4ef6\u64cd\u4f5c\uff1f\u300b<\/span>\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\uff0c\u6216\u8005\u662f\u5bf9<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01,<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241105\/17308033596729f69fb9eb2.jpg\" class=\"aligncenter\">,<br \/>\n<strong>go \u4e2d\u5728 select \u4e2d\u5ef6\u8fdf\u6267\u884c\u53d6\u6d88\u4e8b\u4ef6<\/strong>,\u5f53\u9700\u8981\u5728\u63a5\u6536 ctx.done() \u6d88\u606f\u65f6\u5ef6\u8fdf\u6267\u884c\u67d0\u4e2a\u64cd\u4f5c\uff0c\u4f46\u53c8\u4e0d\u5e0c\u671b\u76f4\u63a5\u5728 ctx.done() \u5185\u6267\u884c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 select \u6765\u5b9e\u73b0\u3002,\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff1a,\u6b64\u65b9\u6cd5\u5141\u8bb8\u60a8\u5728\u6536\u5230\u53d6\u6d88\u4fe1\u53f7\u540e\u5ef6\u8fdf\u6267\u884c\u64cd\u4f5c\uff0c\u800c\u65e0\u9700\u5c06\u4ee3\u7801\u76f4\u63a5\u653e\u5728 ctx.done() \u4e2d\u3002,\u672c\u7bc7\u5173\u4e8e\u300aGo \u4e2d\u5982\u4f55\u5ef6\u8fdf\u6267\u884c\u53d6\u6d88\u4e8b\u4ef6\u64cd\u4f5c\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8eGOLANG\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff01,\u4f7f\u7528 newticker \u521b\u5efa\u4e00\u4e2a ticker\u3002,\u521b\u5efa\u4e00\u4e2a\u5e26\u6709\u8d85\u65f6\u7684\u4e0a\u4e0b\u6587 ctx\u3002,<\/p>\n<p>\u5728 select \u4e2d\uff1a<\/p>\n<ul>\n<li>\u76d1\u542c ctx.done() \u901a\u9053\uff0c\u5982\u679c\u63a5\u6536\u5230\u6d88\u606f\uff0c\u5219\u5c06 shouldreturn \u8bbe\u7f6e\u4e3a true \u5e76\u4f7f\u7528 fallthrough \u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u884c\u3002<\/li>\n<li>\u76d1\u542c ticker \u901a\u9053\uff0c\u5982\u679c\u63a5\u6536\u5230\u6d88\u606f\uff0c\u5219\u6267\u884c\u4ee3\u7801\u5e76\u68c0\u67e5 shouldreturn \u662f\u5426\u4e3a true\u3002\u5982\u679c\u662f\uff0c\u5219\u9000\u51fa\u5faa\u73af\u3002<\/li>\n<\/ul>\n<p>,go \u4e2d\u5728 select \u4e2d\u5ef6\u8fdf\u6267\u884c\u53d6\u6d88\u4e8b\u4ef6,\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aGo \u4e2d\u5982\u4f55\u5ef6\u8fdf\u6267\u884c\u53d6\u6d88\u4e8b\u4ef6\u64cd\u4f5c\uff1f\u300b<\/span>\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\uff0c\u6216\u8005\u662f\u5bf9<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01,<br \/>\n<b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span>  <span>&gt;<\/span>  <span>&gt;<\/span>  <span>&gt;<\/span> <span>Go \u4e2d\u5982\u4f55\u5ef6\u8fdf\u6267\u884c\u53d6\u6d88\u4e8b\u4ef6\u64cd\u4f5c\uff1f<\/span><\/p>\n<h1>Go \u4e2d\u5982\u4f55\u5ef6\u8fdf\u6267\u884c\u53d6\u6d88\u4e8b\u4ef6\u64cd\u4f5c\uff1f<\/h1>\n<p><span>2024-11-05 18:42:55<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aGo \u4e2d\u5982\u4f55\u5ef6\u8fdf\u6267\u884c\u53d6\u6d88\u4e8b\u4ef6\u64cd\u4f5c\uff1f\u300b<\/span>\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\uff0c\u6216\u8005\u662f\u5bf9<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241105\/17308033596729f69fb9eb2.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>go \u4e2d\u5728 select \u4e2d\u5ef6\u8fdf\u6267\u884c\u53d6\u6d88\u4e8b\u4ef6<\/strong><\/p>\n<p>\u5f53\u9700\u8981\u5728\u63a5\u6536 ctx.done() \u6d88\u606f\u65f6\u5ef6\u8fdf\u6267\u884c\u67d0\u4e2a\u64cd\u4f5c\uff0c\u4f46\u53c8\u4e0d\u5e0c\u671b\u76f4\u63a5\u5728 ctx.done() \u5185\u6267\u884c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 select \u6765\u5b9e\u73b0\u3002<\/p>\n<pre>\u5305\u4ee3\u7801\uff1a\n\nimport (\n  \"context\"\n  \"fmt\"\n  \"time\"\n)\n\nfunc main() {\n  \/\/ \u8bbe\u7f6e\u4e0a\u4e0b\u6587\u548c ticker\n  ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)\n  defer cancel()\n  ticker := time.NewTicker(1 * time.Second)\n\n  \/\/ \u5f00\u59cb select\n  shouldReturn := false\n  for {\n    select {\n    case &lt;-ctx.Done():\n      shouldReturn = true\n      fallthrough\n    case &lt;-ticker.C:\n      \/\/ \u6267\u884c\u4ee3\u7801\n      fmt.Println(\"Ticker fired\")\n\n      if shouldReturn {\n        return\n      }\n    }\n  }\n}<\/pre>\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff1a<\/p>\n<ul>\n<li>\u521b\u5efa\u4e00\u4e2a\u5e26\u6709\u8d85\u65f6\u7684\u4e0a\u4e0b\u6587 ctx\u3002<\/li>\n<li>\u4f7f\u7528 newticker \u521b\u5efa\u4e00\u4e2a ticker\u3002<\/li>\n<li>\n<p>\u5728 select \u4e2d\uff1a<\/p>\n<ul>\n<li>\u76d1\u542c ctx.done() \u901a\u9053\uff0c\u5982\u679c\u63a5\u6536\u5230\u6d88\u606f\uff0c\u5219\u5c06 shouldreturn \u8bbe\u7f6e\u4e3a true \u5e76\u4f7f\u7528 fallthrough \u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u884c\u3002<\/li>\n<li>\u76d1\u542c ticker \u901a\u9053\uff0c\u5982\u679c\u63a5\u6536\u5230\u6d88\u606f\uff0c\u5219\u6267\u884c\u4ee3\u7801\u5e76\u68c0\u67e5 shouldreturn \u662f\u5426\u4e3a true\u3002\u5982\u679c\u662f\uff0c\u5219\u9000\u51fa\u5faa\u73af\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u65e0\u9650\u5faa\u73af select\uff0c\u76f4\u5230\u6536\u5230 ctx.done() \u6d88\u606f\u6216 ticker \u89e6\u53d1\u3002<\/li>\n<li>\u5728\u6536\u5230 ctx.done() \u6d88\u606f\u540e\uff0c\u6211\u4eec\u5141\u8bb8 select \u5faa\u73af\u4e00\u6b21\uff0c\u4ee5\u6267\u884c ticker \u4ee3\u7801\uff0c\u7136\u540e\u9000\u51fa\u3002<\/li>\n<\/ul>\n<p>\u6b64\u65b9\u6cd5\u5141\u8bb8\u60a8\u5728\u6536\u5230\u53d6\u6d88\u4fe1\u53f7\u540e\u5ef6\u8fdf\u6267\u884c\u64cd\u4f5c\uff0c\u800c\u65e0\u9700\u5c06\u4ee3\u7801\u76f4\u63a5\u653e\u5728 ctx.done() \u4e2d\u3002<\/p>\n<p>\u672c\u7bc7\u5173\u4e8e\u300aGo \u4e2d\u5982\u4f55\u5ef6\u8fdf\u6267\u884c\u53d6\u6d88\u4e8b\u4ef6\u64cd\u4f5c\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8eGOLANG\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   \u7f51\u9875\u6700\u7ec8\u6e32\u67d3\u5f62\u5f0f\u63a2\u7a76\uff1a\u6d4f\u89c8\u5668\u662f\u5982\u4f55\u5c06\u4ee3\u7801\u8f6c\u5316\u4e3a\u53ef\u89c6\u5316\u9875\u9762\u7684\uff1f\n <\/dd>\n<\/dl>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   MySQL \u4e2d\u53cc\u8868 dual \u6709\u4ec0\u4e48\u7528\u9014\u548c\u5e94\u7528\u573a\u666f\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-206178","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206178","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=206178"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206178\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206178"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206178"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}