{"id":207471,"date":"2025-07-08T11:05:58","date_gmt":"2025-07-08T03:05:58","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207471\/"},"modified":"2025-07-08T11:05:58","modified_gmt":"2025-07-08T03:05:58","slug":"%e5%bd%93%e9%80%89%e5%ae%9a%e7%bb%84%e4%b8%ad%e7%9a%84%e9%80%9a%e9%81%93%e5%9c%a8%e6%8c%87%e5%ae%9a%e6%97%b6%e9%97%b4%e5%86%85%e6%b2%a1%e6%9c%89%e6%94%b6%e5%88%b0%e4%bf%a1%e5%8f%b7%e6%97%b6%e8%b7%b3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207471\/","title":{"rendered":"\u5f53\u9009\u5b9a\u7ec4\u4e2d\u7684\u901a\u9053\u5728\u6307\u5b9a\u65f6\u95f4\u5185\u6ca1\u6709\u6536\u5230\u4fe1\u53f7\u65f6\u8df3\u51fa\u5faa\u73af"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u5f53\u9009\u5b9a\u7ec4\u4e2d\u7684\u901a\u9053\u5728\u6307\u5b9a\u65f6\u95f4\u5185\u6ca1\u6709\u6536\u5230\u4fe1\u53f7\u65f6\u8df3\u51fa\u5faa\u73af<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-22 20:57:32<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4f60\u5728\u5b66\u4e60Golang<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\u5417\uff1f\u672c\u6587\u300a\u5f53\u9009\u5b9a\u7ec4\u4e2d\u7684\u901a\u9053\u5728\u6307\u5b9a\u65f6\u95f4\u5185\u6ca1\u6709\u6536\u5230\u4fe1\u53f7\u65f6\u8df3\u51fa\u5faa\u73af\u300b<\/span>\uff0c\u4e3b\u8981\u4ecb\u7ecd\u7684\u5185\u5bb9\u5c31\u6d89\u53ca\u5230<\/span>\uff0c\u5982\u679c\u4f60\u60f3\u63d0\u5347\u81ea\u5df1\u7684\u5f00\u53d1\u80fd\u529b\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5927\u5bb6\u8981\u77e5\u9053\u7f16\u7a0b\u7406\u8bba\u57fa\u7840\u548c\u5b9e\u6218\u64cd\u4f5c\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u54e6\uff01<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u5f53\u4e14\u4ec5\u5f53\u6211\u5728\u7279\u5b9a\u65f6\u95f4\u6bb5\u5185\u6211\u7684 select \u8bed\u53e5\u6b63\u5728\u4fa6\u542c\u7684\u4efb\u4f55\u901a\u9053\u4e0a\u90fd\u6ca1\u6709\u6536\u5230\u4fe1\u53f7\u65f6\uff0c\u5982\u4f55\u6253\u7834\u5305\u542b select \u8bed\u53e5\u7684\u60ef\u7528 go for \u5faa\u73af\u3002<\/p>\n

\u8ba9\u6211\u7528\u4e00\u4e2a\u4f8b\u5b50\u6765\u589e\u5f3a\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n

\u8bbe\u7f6e\uff1a<\/h3>\n
    \n
  1. \u5047\u8bbe\u6211\u6709\u4e00\u4e2a\u6b63\u5728\u6536\u542c\u7684\u9891\u9053 varlistench <-chan string<\/code>\u3002<\/li>\n
  2. \u8ba9\u6211\u4eec\u5047\u8bbe\u5176\u4ed6\u4e00\u4e9b go \u4f8b\u7a0b\uff08\u4e0d\u5728\u6211\u4eec\u7684\u63a7\u5236\u8303\u56f4\u5185\uff09\u5728\u6b64\u901a\u9053\u4e0a\u53d1\u9001\u4e0d\u540c\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n
  3. \u6211\u5bf9\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u8fdb\u884c\u4e00\u4e9b\u5904\u7406\uff0c\u7136\u540e\u5728 listench<\/code> \u4e0a\u4fa6\u542c\u4e0b\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ol>\n

    \u8981\u6c42\uff1a<\/h3>\n

    \u5728\u5173\u95ed\u64cd\u4f5c\uff08\u6c38\u4e45\u9000\u51fa for \u5faa\u73af\uff09\u4e4b\u524d\uff0c\u6211\u5e0c\u671b\u5728 listench<\/code> \u4e0a\u7684\u4e24\u4e2a\u8fde\u7eed\u4fe1\u53f7\u4e4b\u95f4\u6700\u591a\u7b49\u5f85 10 \u79d2\uff08\u7cbe\u5ea6\u4e0d\u91cd\u8981\uff09\u3002<\/p>\n

    \u4ee3\u7801\u5b58\u6839\uff1a<\/h3>\n
    func doingSomething(listenCh <-chan string) {\n  var mystr string\n  for {\n    select {\n      case mystr <-listenCh:\n        \/\/dosomething\n      case \/*more than 10 seconds since last signal on listenCh*\/:\n        return\n    }\n  }\n}<\/pre>\n
    \u6211\u5982\u4f55\u4ee5\u6700\u6709\u6548\u7684\u65b9\u5f0f\u5b9e\u73b0\u6211\u7684\u8981\u6c42\u3002<\/p>\n
    \u901a\u5e38\u4f7f\u7528 time.after(time.duration)<\/code> \u7684\u9000\u51fa\u901a\u9053\u6280\u672f\u4f3c\u4e4e\u4e0d\u4f1a\u5728\u4e00\u6b21\u5faa\u73af\u540e\u91cd\u7f6e\uff0c\u56e0\u6b64\u5373\u4f7f\u5b58\u5728\u8fde\u7eed\u7684\u503c\u6d41\uff0c\u6574\u4e2a\u7a0b\u5e8f\u4e5f\u4f1a\u5728 10 \u79d2\u5185\u5173\u95ed\u3002<\/p>\n
    \u6211\u5728 so \u4e0a\u627e\u5230\u4e86\u95ee\u9898\u7684\u53d8\u4f53\uff08\u4f46\u4e0d\u662f\u6211\u60f3\u8981\u7684\uff09\uff0c\u4f46\u6211\u770b\u5230\u7684\u6ca1\u6709\u4e00\u4e2a\u80fd\u56de\u7b54\u6211\u7684\u7279\u5b9a\u7528\u4f8b\u3002<\/p>\n
     <\/p>\n
    \u89e3\u51b3\u65b9\u6848<\/h2>\n
     <\/p>\n
    \u524d\u8a00\uff1a<\/strong>\u4f7f\u7528time.timer<\/code>\u662f\u63a8\u8350\u7684\u65b9\u5f0f\uff0c\u8fd9\u91cc\u4f7f\u7528time.after()<\/code>\u4ec5\u7528\u4e8e\u6f14\u793a\u548c\u63a8\u7406\u3002\u8bf7\u4f7f\u7528\u7b2c\u4e8c\u79cd\u65b9\u6cd5\u3002<\/p>\n
    \u4f7f\u7528 time.after()<\/code> \uff08\u4e0d\u63a8\u8350\u8fd9\u6837\u505a\uff09<\/h3>\n
    \u5982\u679c\u60a8\u5c06 \u653e\u5165 case \u5206\u652f\u4e2d\uff0c\u5219\u4f1a\u5728\u6bcf\u6b21\u8fed\u4ee3\u4e2d\u201c\u91cd\u7f6e\u201d\uff0c\u56e0\u4e3a\u6bcf\u6b21\u90fd\u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u901a\u9053\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u4e86\uff1a<\/p>\n
    func doingsomething(listench <-chan string) {\n    for {\n        select {\n        case mystr := <-listench:\n            log.println(\"received\", mystr)\n        case <-time.after(1 * time.second):\n            log.println(\"timeout\")\n            return\n        }\n    }\n}<\/pre>\n
    \uff08\u6211\u4f7f\u7528\u4e86 1 \u79d2\u8d85\u65f6\u6765\u5b9e\u73b0\u6f14\u793a\u4e2d\u7684\u53ef\u6d4b\u8bd5\u6027\u3002\uff09<\/p>\n
    \u6211\u4eec\u53ef\u4ee5\u50cf\u8fd9\u6837\u6d4b\u8bd5\u5b83\uff1a<\/p>\n
    ch := make(chan string)\ngo func() {\n    for i := 0; i < 3; i++ {\n        ch <- fmt.sprint(i)\n        time.sleep(500 * time.millisecond)\n    }\n}()\ndoingsomething(ch)<\/pre>\n
    \u8f93\u51fa\uff08\u5728 \u4e0a\u5c1d\u8bd5\uff09\uff1a<\/p>\n
    2009\/11\/10 23:00:00 received 0\n2009\/11\/10 23:00:00 received 1\n2009\/11\/10 23:00:01 received 2\n2009\/11\/10 23:00:02 timeout<\/pre>\n
    \u4f7f\u7528time.timer<\/code>\uff08\u63a8\u8350\u89e3\u51b3\u65b9\u6848\uff09<\/h3>\n
    \u5982\u679c\u4ece\u901a\u9053\u63a5\u6536\u7684\u901f\u7387\u5f88\u9ad8\uff0c\u8fd9\u53ef\u80fd\u4f1a\u6d6a\u8d39\u4e00\u4e9b\u8d44\u6e90\uff0c\u56e0\u4e3a time.after()<\/code> \u5728\u540e\u53f0\u521b\u5efa\u5e76\u4f7f\u7528\u4e86\u4e00\u4e2a\u65b0\u7684\u8ba1\u65f6\u5668\uff0c\u5b83\u4e0d\u4f1a\u795e\u5947\u5730\u505c\u6b62\u5e76\u83b7\u53d6\u5982\u679c\u60a8\u5728\u8d85\u65f6\u4e4b\u524d\u4ece\u901a\u9053\u6536\u5230\u503c\uff0c\u5219\u4e0d\u518d\u9700\u8981\u65f6\u7acb\u5373\u6536\u96c6\u5783\u573e\u3002<\/p>\n
    \u66f4\u8d44\u6e90\u53cb\u597d\u7684\u89e3\u51b3\u65b9\u6848\u662f\u5728\u5faa\u73af\u4e4b\u524d\u521b\u5efa\u4e00\u4e2a \uff0c\u5e76\u5728\u8d85\u65f6\u4e4b\u524d\u6536\u5230\u503c\u65f6\u91cd\u7f6e\u5b83\u3002<\/p>\n
    \u8fd9\u5c31\u662f\u5b83\u7684\u6837\u5b50\uff1a<\/p>\n
    func doingSomething(listenCh <-chan string) {\n    d := 1 * time.Second\n    t := time.NewTimer(d)\n    for {\n        select {\n        case mystr := <-listenCh:\n            log.Println(\"Received\", mystr)\n            if !t.Stop() {\n                <-t.C\n            }\n            t.Reset(d)\n        case <-t.C:\n            log.Println(\"Timeout\")\n            return\n        }\n    }\n}<\/pre>\n
    \u6d4b\u8bd5\u548c\u8f93\u51fa\u662f\u76f8\u540c\u7684\u3002\u5728 \u4e0a\u8bd5\u8bd5\u8fd9\u4e2a\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\uff01\u66f4\u591a\u5173\u4e8eGolang\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/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-207471","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207471","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=207471"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207471\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207471"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207471"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207471"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}