{"id":57756,"date":"2024-10-10T20:53:20","date_gmt":"2024-10-10T12:53:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/57756\/"},"modified":"2024-10-10T20:53:21","modified_gmt":"2024-10-10T12:53:21","slug":"go%e6%95%99%e7%a8%8b-go-%e8%aa%9e%e8%a8%80-channel-%e8%b6%85%e6%99%82%e6%a9%9f%e5%88%b6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/57756\/","title":{"rendered":"GO\u6559\u7a0b: Go \u8a9e\u8a00 channel \u8d85\u6642\u6a5f\u5236"},"content":{"rendered":"

GO\u6559\u7a0b: Go \u8a9e\u8a00 channel \u8d85\u6642\u6a5f\u5236<\/h1>\n

\u5728 Go \u8a9e\u8a00\u4e2d\uff0cchannel \u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u7528\u65bc\u5728 goroutine \u4e4b\u9593\u9032\u884c\u901a\u4fe1\u3002\u5b83\u4e0d\u50c5\u80fd\u5920\u50b3\u905e\u6578\u64da\uff0c\u9084\u80fd\u5920\u5354\u8abf goroutine \u7684\u57f7\u884c\u3002\u7136\u800c\uff0c\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u8a2d\u7f6e\u8d85\u6642\u6a5f\u5236\uff0c\u4ee5\u9632\u6b62 goroutine \u7121\u9650\u671f\u5730\u7b49\u5f85\u67d0\u500b\u64cd\u4f5c\u7684\u5b8c\u6210\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728 Go \u8a9e\u8a00\u4e2d\u5be6\u73fe channel \u7684\u8d85\u6642\u6a5f\u5236\u3002<\/p>\n

\u70ba\u4ec0\u9ebc\u9700\u8981\u8d85\u6642\u6a5f\u5236<\/h2>\n

\u5728\u4e26\u767c\u7de8\u7a0b\u4e2d\uff0cgoroutine \u4e4b\u9593\u7684\u901a\u4fe1\u53ef\u80fd\u6703\u56e0\u70ba\u67d0\u4e9b\u539f\u56e0\u800c\u963b\u585e\u3002\u4f8b\u5982\uff0c\u7576\u4e00\u500b goroutine \u5617\u8a66\u5f9e\u4e00\u500b\u7a7a\u7684 channel \u4e2d\u63a5\u6536\u6578\u64da\u6642\uff0c\u5b83\u6703\u88ab\u963b\u585e\uff0c\u76f4\u5230\u6709\u6578\u64da\u53ef\u7528\u3002\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0c\u5982\u679c\u6c92\u6709\u9069\u7576\u7684\u8d85\u6642\u6a5f\u5236\uff0c\u7a0b\u5e8f\u53ef\u80fd\u6703\u7121\u9650\u671f\u5730\u7b49\u5f85\uff0c\u5c0e\u81f4\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u4e0b\u964d\u6216\u751a\u81f3\u5d29\u6f70\u3002<\/p>\n

\u4f7f\u7528 select \u8a9e\u53e5\u5be6\u73fe\u8d85\u6642<\/h2>\n

Go \u8a9e\u8a00\u63d0\u4f9b\u4e86\u4e00\u500b\u540d\u70ba select<\/code> \u7684\u8a9e\u53e5\uff0c\u53ef\u4ee5\u7528\u4f86\u7b49\u5f85\u591a\u500b channel \u7684\u64cd\u4f5c\u3002\u901a\u904e\u5728 select<\/code> \u4e2d\u4f7f\u7528 time.After<\/code> \u51fd\u6578\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u5730\u5be6\u73fe\u8d85\u6642\u6a5f\u5236\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n

package main\n\nimport (\n    \"fmt\"\n    \"time\"\n)\n\nfunc main() {\n    ch := make(chan string)\n\n    go func() {\n        time.Sleep(2 * time.Second) \/\/ \u6a21\u64ec\u4e00\u4e9b\u5de5\u4f5c\n        ch <- \"\u5b8c\u6210\"\n    }()\n\n    select {\n    case msg := <-ch:\n        fmt.Println(msg)\n    case <-time.After(1 * time.Second):\n        fmt.Println(\"\u8d85\u6642\u4e86\")\n    }\n}\n<\/code><\/pre>\n
\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b channel ch<\/code>\uff0c\u4e26\u555f\u52d5\u4e86\u4e00\u500b goroutine\uff0c\u8a72 goroutine \u5728 2 \u79d2\u5f8c\u5411 channel \u767c\u9001\u4e00\u689d\u6d88\u606f\u3002\u4e3b goroutine \u4f7f\u7528 select<\/code> \u7b49\u5f85\u4f86\u81ea ch<\/code> \u7684\u6d88\u606f\u6216\u8d85\u6642\u4e8b\u4ef6\u3002\u5982\u679c\u5728 1 \u79d2\u5167\u6c92\u6709\u6536\u5230\u6d88\u606f\uff0c\u5247\u6703\u6253\u5370\u201c\u8d85\u6642\u4e86\u201d\u3002<\/p>\n
\u4f7f\u7528 context \u5305\u5be6\u73fe\u8d85\u6642<\/h2>\n
\u9664\u4e86\u4f7f\u7528 select<\/code> \u548c time.After<\/code>\uff0c\u6211\u5011\u9084\u53ef\u4ee5\u4f7f\u7528 Go \u7684 context<\/code> \u5305\u4f86\u5be6\u73fe\u66f4\u9748\u6d3b\u7684\u8d85\u6642\u63a7\u5236\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 context<\/code> \u7684\u793a\u4f8b\uff1a<\/p>\n
package main\n\nimport (\n    \"context\"\n    \"fmt\"\n    \"time\"\n)\n\nfunc main() {\n    ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)\n    defer cancel()\n\n    ch := make(chan string)\n\n    go func() {\n        time.Sleep(2 * time.Second) \/\/ \u6a21\u64ec\u4e00\u4e9b\u5de5\u4f5c\n        ch <- \"\u5b8c\u6210\"\n    }()\n\n    select {\n    case msg := <-ch:\n        fmt.Println(msg)\n    case <-ctx.Done():\n        fmt.Println(\"\u8d85\u6642\u4e86:\", ctx.Err())\n    }\n}\n<\/code><\/pre>\n
\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 context.WithTimeout<\/code> \u5275\u5efa\u4e86\u4e00\u500b\u5e36\u6709\u8d85\u6642\u7684\u4e0a\u4e0b\u6587\u3002\u7576\u4e0a\u4e0b\u6587\u8d85\u6642\u6642\uff0cctx.Done()<\/code> \u6703\u88ab\u89f8\u767c\uff0c\u4e26\u4e14\u6211\u5011\u53ef\u4ee5\u5728 select<\/code> \u4e2d\u6355\u7372\u9019\u500b\u4e8b\u4ef6\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728 Go \u8a9e\u8a00\u4e2d\uff0cchannel \u7684\u8d85\u6642\u6a5f\u5236\u662f\u78ba\u4fdd\u7a0b\u5e8f\u7a69\u5b9a\u6027\u548c\u6027\u80fd\u7684\u91cd\u8981\u624b\u6bb5\u3002\u901a\u904e\u4f7f\u7528 select<\/code> \u8a9e\u53e5\u548c context<\/code> \u5305\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406 goroutine \u4e4b\u9593\u7684\u901a\u4fe1\uff0c\u907f\u514d\u7121\u9650\u671f\u7684\u963b\u585e\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u63d0\u9ad8\u4e86\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\uff0c\u9084\u589e\u5f37\u4e86\u61c9\u7528\u7a0b\u5e8f\u7684\u5065\u58ef\u6027\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 \u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3 Go \u8a9e\u8a00\u4e2d\u7684 channel \u8d85\u6642\u6a5f\u5236\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u7ba1\u7406 goroutine \u548c\u907f\u514d\u6b7b\u9396\uff0c\u63d0\u5347\u7a0b\u5f0f\u6027\u80fd\u8207\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-57756","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57756","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=57756"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57756\/revisions"}],"predecessor-version":[{"id":57757,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57756\/revisions\/57757"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=57756"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=57756"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=57756"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}