{"id":32,"date":"2022-11-23T20:24:03","date_gmt":"2022-11-23T12:24:03","guid":{"rendered":"https:\/\/www.road-trip.cc\/?p=32"},"modified":"2024-05-06T16:04:03","modified_gmt":"2024-05-06T08:04:03","slug":"sync-once%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.road-trip.cc\/?p=32","title":{"rendered":"sync.Once\u89e3\u6790"},"content":{"rendered":"\n<p>\u6709\u65f6\u5019\u6211\u4eec\u67d0\u4e2a\u51fd\u6570\u53ea\u9700\u8981\u8fd0\u884c\u4e00\u6b21\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528sync.Once\u6765\u4fdd\u8bc1\uff0c\u53c2\u8003\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-tertiary-background-color has-background\" style=\"border-width:1px\"><code>package main\n\nimport (\n    \"fmt\"\n    \"sync\"\n)\n\nfunc main() {\n    initFunc := func() {\n        fmt.Println(\"init func must run once\")\n    }\n    var once sync.Once\n    done := make(chan bool)\n    for i := 0; i &lt; 10; i++ {\n        go func(i int) {\n            fmt.Println(i)\n            once.Do(initFunc)\n            done &lt;- true\n        }(i)\n    }\n    for i := 0; i &lt; 10; i++ {\n        &lt;-done\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5f53\u6211\u4eec\u4ec5\u4ec5\u60f3\u8fd0\u884c\u4e00\u6b21initFunc\u65f6\u5019\uff0c\u53ef\u4ee5\u7528sync.Once\u6765\u8fd0\u884c\u3002\u6bd4\u5982\u83b7\u53d6\u5355\u4f8b\u5b9e\u4f8b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6709\u65f6\u5019\u6211\u4eec\u67d0\u4e2a\u51fd\u6570\u53ea\u9700\u8981\u8fd0\u884c\u4e00\u6b21\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528sync.Once\u6765\u4fdd\u8bc1\uff0c\u53c2\u8003\u4ee3\u7801\uff1a \u5f53\u6211\u4eec\u4ec5\u4ec5\u60f3\u8fd0\u884c\u4e00\u6b21ini &#8230; <a title=\"sync.Once\u89e3\u6790\" class=\"read-more\" href=\"https:\/\/www.road-trip.cc\/?p=32\" aria-label=\"\u9605\u8bfb sync.Once\u89e3\u6790\">\u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[15,13,14,20,17],"class_list":["post-32","post","type-post","status-publish","format-standard","hentry","category-7","tag-gl","tag-go","tag-golang","tag-once","tag-sync"],"_links":{"self":[{"href":"https:\/\/www.road-trip.cc\/index.php?rest_route=\/wp\/v2\/posts\/32","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.road-trip.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.road-trip.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.road-trip.cc\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.road-trip.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=32"}],"version-history":[{"count":1,"href":"https:\/\/www.road-trip.cc\/index.php?rest_route=\/wp\/v2\/posts\/32\/revisions"}],"predecessor-version":[{"id":33,"href":"https:\/\/www.road-trip.cc\/index.php?rest_route=\/wp\/v2\/posts\/32\/revisions\/33"}],"wp:attachment":[{"href":"https:\/\/www.road-trip.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=32"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.road-trip.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=32"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.road-trip.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=32"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}