{"id":206619,"date":"2025-06-12T12:43:21","date_gmt":"2025-06-12T04:43:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206619\/"},"modified":"2025-06-12T12:43:21","modified_gmt":"2025-06-12T04:43:21","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-channel-%e6%88%96-context-%e7%ad%89%e5%be%85%e5%a4%9a%e4%b8%aa%e5%ad%90%e5%8d%8f%e7%a8%8b%e6%89%a7%e8%a1%8c%e5%ae%8c%e6%af%95%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206619\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 Channel \u6216 Context \u7b49\u5f85\u591a\u4e2a\u5b50\u534f\u7a0b\u6267\u884c\u5b8c\u6bd5\uff1f"},"content":{"rendered":"

\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60
\nGOLANG<\/span>\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765
\n\u300a\u5982\u4f55\u4f7f\u7528 Channel \u6216 Context \u7b49\u5f85\u591a\u4e2a\u5b50\u534f\u7a0b\u6267\u884c\u5b8c\u6bd5\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230
\n<\/span>\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01,
\n,
\n\u534f\u7a0b\u7b49\u5f85\uff1a\u901a\u8fc7 channel \u6216 context \u5b9e\u73b0<\/strong>,\u60f3\u8981\u7b49\u5f85\u591a\u4e2a\u5b50\u534f\u7a0b\u6267\u884c\u5b8c\u6bd5\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 channel \u6216 context \u5b9e\u73b0\uff0c\u7c7b\u4f3c\u4e8e sync.waitgroup \u7684\u529f\u80fd\u3002,
\nchannel<\/strong>,channel \u7528\u4e8e\u5728\u534f\u7a0b\u95f4\u901a\u8baf\u3002\u53ef\u4ee5\u901a\u8fc7\u521b\u5efa\u4e00\u4e2a\u7f13\u51b2 channel\uff0c\u5e76\u4e3a\u6bcf\u4e2a\u534f\u7a0b\u53d1\u9001\u4e00\u4e2a\u503c\uff0c\u6765\u5b9e\u73b0\u5b50\u534f\u7a0b\u5b8c\u6210\u540e\u901a\u77e5\u4e3b\u534f\u7a0b\u3002,
\ncontext<\/strong>,context \u662f\u4e00\u79cd\u66f4\u901a\u7528\u7684\u673a\u5236\uff0c\u53ef\u4ee5\u7528\u6765\u4f20\u64ad\u53d6\u6d88\u4fe1\u53f7\u6216\u5176\u4ed6\u503c\u3002\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 withcancel \u51fd\u6570\u521b\u5efa\u4e00\u4e2a context\uff0c\u5e76\u4f20\u9012\u7ed9\u5b50\u534f\u7a0b\u3002\u5f53\u4e3b\u534f\u7a0b\u53d6\u6d88 context \u65f6\uff0c\u5b50\u534f\u7a0b\u4f1a\u81ea\u52a8\u7ec8\u6b62\u3002,\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u5982\u4f55\u4f7f\u7528 Channel \u6216 Context \u7b49\u5f85\u591a\u4e2a\u5b50\u534f\u7a0b\u6267\u884c\u5b8c\u6bd5\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002,\u534f\u7a0b\u7b49\u5f85\uff1a\u901a\u8fc7 channel \u6216 context \u5b9e\u73b0,\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60
\nGOLANG<\/span>\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765
\n\u300a\u5982\u4f55\u4f7f\u7528 Channel \u6216 Context \u7b49\u5f85\u591a\u4e2a\u5b50\u534f\u7a0b\u6267\u884c\u5b8c\u6bd5\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230
\n<\/span>\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01,
\n<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u5982\u4f55\u4f7f\u7528 Channel \u6216 Context \u7b49\u5f85\u591a\u4e2a\u5b50\u534f\u7a0b\u6267\u884c\u5b8c\u6bd5\uff1f<\/span><\/p>\n

\u5982\u4f55\u4f7f\u7528 Channel \u6216 Context \u7b49\u5f85\u591a\u4e2a\u5b50\u534f\u7a0b\u6267\u884c\u5b8c\u6bd5\uff1f<\/h1>\n

2024-11-17 14:09:56<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60GOLANG<\/span>\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\u300a\u5982\u4f55\u4f7f\u7528 Channel \u6216 Context \u7b49\u5f85\u591a\u4e2a\u5b50\u534f\u7a0b\u6267\u884c\u5b8c\u6bd5\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n

<\/p>\n

\u534f\u7a0b\u7b49\u5f85\uff1a\u901a\u8fc7 channel \u6216 context \u5b9e\u73b0<\/strong><\/p>\n

\u60f3\u8981\u7b49\u5f85\u591a\u4e2a\u5b50\u534f\u7a0b\u6267\u884c\u5b8c\u6bd5\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 channel \u6216 context \u5b9e\u73b0\uff0c\u7c7b\u4f3c\u4e8e sync.waitgroup \u7684\u529f\u80fd\u3002<\/p>\n

channel<\/strong><\/p>\n

channel \u7528\u4e8e\u5728\u534f\u7a0b\u95f4\u901a\u8baf\u3002\u53ef\u4ee5\u901a\u8fc7\u521b\u5efa\u4e00\u4e2a\u7f13\u51b2 channel\uff0c\u5e76\u4e3a\u6bcf\u4e2a\u534f\u7a0b\u53d1\u9001\u4e00\u4e2a\u503c\uff0c\u6765\u5b9e\u73b0\u5b50\u534f\u7a0b\u5b8c\u6210\u540e\u901a\u77e5\u4e3b\u534f\u7a0b\u3002<\/p>\n

import \"math\/rand\"\nimport \"time\"\n\nfunc main() {\n    const num = 10\n    ch := make(chan int, num)\n\n    for i := 0; i < num; i++ {\n        go func() {\n            fmt.println(\"goroutine start: \", i)\n            t := rand.intn(5) + 1\n            time.sleep(time.duration(t) * time.second)\n            fmt.println(\"goroutine end: \", i)\n            ch <- 0\n        }()\n    }\n\n    fmt.println(\"main start\")\n    for i := 0; i < num; i++ {\n        <-ch\n        fmt.println(\"main get: \", i)\n    }\n    fmt.println(\"main end\")\n}<\/pre>\n
context<\/strong><\/p>\n
context \u662f\u4e00\u79cd\u66f4\u901a\u7528\u7684\u673a\u5236\uff0c\u53ef\u4ee5\u7528\u6765\u4f20\u64ad\u53d6\u6d88\u4fe1\u53f7\u6216\u5176\u4ed6\u503c\u3002\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 withcancel \u51fd\u6570\u521b\u5efa\u4e00\u4e2a context\uff0c\u5e76\u4f20\u9012\u7ed9\u5b50\u534f\u7a0b\u3002\u5f53\u4e3b\u534f\u7a0b\u53d6\u6d88 context \u65f6\uff0c\u5b50\u534f\u7a0b\u4f1a\u81ea\u52a8\u7ec8\u6b62\u3002<\/p>\n
import \"context\"\n\nfunc main() {\n    const num = 10\n\n    ctx, cancel := context.WithCancel(context.Background())\n    ch := make(chan int, num)\n\n    for i := 0; i < num; i++ {\n        go func(ctx context.Context) {\n            fmt.Println(\"goroutine start: \", i)\n            select {\n            case <-ctx.Done():\n                fmt.Println(\"goroutine cancelled: \", i)\n                return\n            default:\n            }\n            t := rand.Intn(5) + 1\n            time.Sleep(time.Duration(t) * time.Second)\n            fmt.Println(\"goroutine end: \", i)\n            ch <- 0\n        }(ctx)\n    }\n\n    fmt.Println(\"main start\")\n    for i := 0; i < num; i++ {\n        <-ch\n        fmt.Println(\"main get: \", i)\n    }\n    cancel()\n    fmt.Println(\"main end\")\n}<\/pre>\n
\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u5982\u4f55\u4f7f\u7528 Channel \u6216 Context \u7b49\u5f85\u591a\u4e2a\u5b50\u534f\u7a0b\u6267\u884c\u5b8c\u6bd5\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n
\n
\n <\/dt>\n
\n   Go \u8bed\u8a00\u5f15\u5165\u7b2c\u4e09\u65b9\u5e93\u540e\uff0c\u5982\u4f55\u907f\u514d\u5e93\u4f5c\u8005\u4fee\u6539\u4ee3\u7801\u5bfc\u81f4\u9879\u76ee\u65e0\u6cd5\u4f7f\u7528\uff1f\n <\/dd>\n<\/dl>\n
\n
\n <\/dt>\n
\n   \u8f6c\u6362\u540e\u5b57\u7b26\u4e32\u7684\u6570\u5b57\u603b\u548c\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60 GOLA...<\/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-206619","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206619","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=206619"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206619\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206619"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206619"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206619"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}