{"id":44476,"date":"2023-01-27T23:27:20","date_gmt":"2023-07-21T01:03:09","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90golang%e3%80%91%e7%ac%ac%e4%b8%89%e6%96%b9%e4%bf%a1%e5%8f%b7%e9%87%8f%e5%ba%93\/"},"modified":"2024-04-29T11:48:13","modified_gmt":"2024-04-29T03:48:13","slug":"%e3%80%90golang%e3%80%91%e7%ac%ac%e4%b8%89%e6%96%b9%e4%bf%a1%e5%8f%b7%e9%87%8f%e5%ba%93","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90golang%e3%80%91%e7%ac%ac%e4%b8%89%e6%96%b9%e4%bf%a1%e5%8f%b7%e9%87%8f%e5%ba%93\/","title":{"rendered":"\u3010Golang\u3011\u7b2c\u4e09\u65b9\u4fe1\u53f7\u91cf\u5e93"},"content":{"rendered":"<h1>\u3010Golang\u3011\u7b2c\u4e09\u65b9\u4fe1\u53f7\u91cf<\/h1>\n<p>\u57fa\u56e0Golang\u7684\u57fa\u7840\u5b66\u4e60\uff0c\u76f4\u5230\u521b\u5efaWeb\u5e94\u7528\u7a0b\u5e8f\u7684\u5b66\u4e60\u5df2\u7ecf\u5b8c\u6210\uff0c\u6240\u4ee5\u6211\u5c06\u8fdb\u884c\u590d\u4e60\u5e76\u603b\u7ed3\u3002\u4ece\u57fa\u7840\u5230\u5e94\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code>package main \r\n\/*\r\nSemaphore\r\n\r\n\u4e26\u5217\u51e6\u7406\r\n\r\n\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb \u6e08\r\nhttps:\/\/godoc.org\/golang.org\/x\/sync\/semaphore\r\ngo get \"golang.org\/x\/sync\/semaphore\"\r\n*\/\r\n\r\nimport (\r\n    \"context\"\r\n    \"fmt\"\r\n    \"time\"\r\n\r\n    \"golang.org\/x\/sync\/semaphore\"\r\n)\r\n\r\n\/\/2\r\n\/\/\u3053\u3053\u304c\u30bb\u30de\u30d5\u30a9\r\n\/\/semaphore\u3067\u540c\u6642\u306b\u8d70\u3089\u305b\u308b\u6570\u6307\u5b9a\u3000==\u30001 \u958b\u59cb\u3059\u308b\u6570\r\nvar s *semaphore.Weighted = semaphore.NewWeighted(1)\r\n\r\n\r\n\/\/3\r\nfunc longProcess(ctx context.Context) {\r\n    \/\/3-2 \u30ad\u30e3\u30f3\u30bb\u30eb\r\n    \/\/goroutin\u3092\u691c\u8a3c\r\n    \/\/1\u3064\u306a\u3089True\r\n    \/\/2\u3064\u306a\u3089False\r\n    isAcquire := s.TryAcquire(1)\r\n\r\n    \/\/\u5f85\u3063\u3066\u3044\u308bgoroutin\u304c\u3042\u3063\u305f\u3089\u3001\u30ad\u30e3\u30f3\u30bb\u30eb\r\n    \/\/2\u3064\u4ee5\u4e0a\u8d70\u3063\u3066\u3044\u305f\u3089\u3001\u30ad\u30e3\u30f3\u30bb\u30eb\u3059\u308b\r\n    if !isAcquire {\r\n        \/\/\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u306a\u3044\r\n        fmt.Println(\"\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u306a\u3044\")\r\n        return \r\n    }\r\n\r\n    \/\/3-1 \u30ed\u30c3\u30af \u5f85\u3064\r\n    \/*\r\n        \/\/err\u304cnil\u3067\u306a\u3051\u308c\u3070\r\n        \/\/err := s.Acquire(ctx, 1); \u3067\u30ed\u30c3\u30af\u3059\u308b\r\n        \/\/\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u7d42\u308f\u3063\u305f\u3089\u30ea\u30ea\u30fc\u30b9\u3059\u308b\u3002\u3053\u306e\u9593\u3001\u4ed6\u306egoroutin\u306f\u5f85\u3063\u3066\u3044\u308b\r\n        \/\/\u4e00\u3064\u305a\u3064\u3057\u304b\u8d70\u3089\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\r\n        if err := s.Acquire(ctx, 1); err != nil{\r\n            \/\/\u51fa\u529b\u3057\u3066\u7d42\u4e86\u3059\u308b\r\n            fmt.Println(err)\r\n            return\r\n        }\r\n    *\/\r\n\r\n    \/\/1\u3064\u305a\u3064\u51e6\u7406\r\n    defer s.Release(1)\r\n    fmt.Println(\"Wait...\")\r\n    time.Sleep(1 * time.Second)\r\n    fmt.Println(\"Done\")\r\n}\r\n\r\nfunc main() {\r\n    \/\/\u51e6\u7406\u672a\u5b9a\u7fa9 TODO\u90e8\u306b\u8a2d\u5b9a\u3067\u304d\u308b\u4e8b\u306f\u307e\u305f\u8abf\u67fb\u3059\u308b\r\n    ctx := context.TODO()\r\n\r\n    \/\/\u4e26\u5217\u51e6\u7406\r\n    \/\/3\u3064\u306egoroutin\r\n    go longProcess(ctx)\r\n    go longProcess(ctx)\r\n    go longProcess(ctx)\r\n\r\n    time.Sleep(5 * time.Second)\r\n\r\n}\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u3010Golang\u3011\u7b2c\u4e09\u65b9\u4fe1\u53f7\u91cf \u57fa\u56e0Golang\u7684\u57fa\u7840\u5b66\u4e60\uff0c\u76f4\u5230\u521b\u5efaWeb\u5e94\u7528\u7a0b\u5e8f\u7684\u5b66\u4e60\u5df2\u7ecf\u5b8c\u6210\uff0c\u6240\u4ee5\u6211\u5c06\u8fdb\u884c\u590d [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44476","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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