{"id":94,"date":"2023-04-09T23:50:32","date_gmt":"2023-04-09T15:50:32","guid":{"rendered":"https:\/\/blog.49cc.top\/?p=94"},"modified":"2023-04-09T23:50:32","modified_gmt":"2023-04-09T15:50:32","slug":"%e5%a4%9a%e5%8d%8f%e7%a8%8b%e6%9f%a5%e8%af%a2%e5%88%87%e7%89%87%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/blog.rrr.ink\/?p=94","title":{"rendered":"\u591a\u534f\u7a0b\u67e5\u8be2\u5207\u7247\u95ee\u9898"},"content":{"rendered":"\n<p><strong>\u9898\u76ee\u63cf\u8ff0\uff1a<\/strong><\/p>\n\n\n\n<p>\u5047\u8bbe\u6709\u4e00\u4e2a\u8d85\u957f\u7684\u5207\u7247\uff0c\u5207\u7247\u7684\u5143\u7d20\u7c7b\u578b\u4e3aint\uff0c\u5207\u7247\u4e2d\u7684\u5143\u7d20\u4e3a\u4e71\u5e8f\u6392\u5e8f\u3002\u9650\u65f65\u79d2\uff0c\u4f7f\u7528\u591a\u4e2agoroutine\u67e5\u627e\u5207\u7247\u4e2d\u662f\u5426\u5b58\u5728\u7ed9\u5b9a\u7684\u503c\uff0c\u5728\u67e5\u627e\u5230\u76ee\u6807\u503c\u6216\u8005\u8d85\u65f6\u540e\u7acb\u523b\u7ed3\u675f\u6240\u6709goroutine\u7684\u6267\u884c\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\uff0c\u5207\u7247&nbsp;<code>[23,32,78,43,76,65,345,762,......915,86]<\/code>\uff0c\u67e5\u627e\u76ee\u6807\u503c\u4e3a 345 \uff0c\u5982\u679c\u5207\u7247\u4e2d\u5b58\u5728\uff0c\u5219\u76ee\u6807\u503c\u8f93\u51fa<code>\"Found it!\"<\/code>\u5e76\u7acb\u5373\u53d6\u6d88\u4ecd\u5728\u6267\u884c\u67e5\u8be2\u4efb\u52a1\u7684<code>goroutine<\/code>\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u5728\u8d85\u65f6\u65f6\u95f4\u672a\u67e5\u5230\u76ee\u6807\u503c\u7a0b\u5e8f\uff0c\u5219\u8f93\u51fa<code>\"Timeout\uff01Not Found\"<\/code>\uff0c\u540c\u65f6\u7acb\u5373\u53d6\u6d88\u4ecd\u5728\u6267\u884c\u7684\u67e5\u627e\u4efb\u52a1\u7684<code>goroutine<\/code>\u3002<\/p>\n\n\n\n<p><strong>\u601d\u8def\uff1a<\/strong><\/p>\n\n\n\n<p>\u5c06\u5207\u7247\u5206\u6210\u591a\u4e2a\u90e8\u5206\u5e76\u4f7f\u7528\u591a\u4e2agoroutine\u540c\u65f6\u67e5\u627e\u76ee\u6807\u503c\u3002\u4f7f\u7528\u4e00\u4e2a\u5e26\u8d85\u65f6\u7684\u4e0a\u4e0b\u6587\u6765\u63a7\u5236\u67e5\u627e\u7684\u8d85\u65f6\uff0c\u4ee5\u53ca\u4e00\u4e2a<code>sync.WaitGroup<\/code>\u6765\u7b49\u5f85\u6240\u6709goroutine\u5b8c\u6210\u3002\u5f53\u627e\u5230\u76ee\u6807\u503c\u6216\u8d85\u65f6\u65f6\uff0c\u53d6\u6d88\u6240\u6709\u4ecd\u5728\u6267\u884c\u67e5\u627e\u4efb\u52a1\u7684goroutine\u3002<\/p>\n\n\n\n<p><strong>\u5b9e\u73b0\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package main\n\nimport (\n\t\"context\"\n\t\"fmt\"\n\t\"math\/rand\"\n\t\"sync\"\n\t\"time\"\n)\n\nfunc main() {\n\tdata := make(&#91;]int, 9999999)\n\tfor i := range data {\n\t\tdata&#91;i] = rand.Intn(9999999)\n\t}\n\ttarget := 345 \/\/\u76ee\u6807\u503c\n\tstartTime := time.Now()\n\tfmt.Println(\"Start time:\", startTime)\n\tctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) \/\/ \u8d85\u65f6\u65f6\u95f4\n\tdefer cancel()\n\n\tvar wg sync.WaitGroup\n\n\tfound := make(chan struct{})\n\n\tparts := 20\n\tfor i := 0; i &lt; parts; i++ { \/\/\n\t\twg.Add(1)\n\t\tgo func(i int) {\n\t\t\tdefer wg.Done()\n\t\t\tSearchTarget(ctx, data&#91;i*(len(data)\/parts):(i+1)*(len(data)\/parts)], target, found)\n\n\t\t}(i)\n\t}\n\n\tselect {\n\tcase &lt;-found:\n\t\tfmt.Println(\"Found it!\")\n\tcase &lt;-ctx.Done():\n\t\tfmt.Println(\"Timeout\uff01Not Found\")\n\t}\n\tcancel()\n\n\twg.Wait()\n\tendTime := time.Now()\n\tfmt.Println(\"End time:\", endTime)\n\n\telapsed := endTime.Sub(startTime)\n\tfmt.Println(\"Elapsed time:\", elapsed)\n}\n\nfunc SearchTarget(ctx context.Context, data &#91;]int, target int, found chan struct{}) {\n\tfor _, i := range data {\n\t\tif ctx.Err() != nil {\n\t\t\treturn\n\t\t}\n\t\tif target == i {\n\t\t\tselect {\n\t\t\tcase found &lt;- struct{}{}:\n\t\t\tcase &lt;-ctx.Done():\n\t\t\t}\n\t\t\treturn\n\t\t}\n\t}\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u76ee\u63cf\u8ff0\uff1a \u5047\u8bbe\u6709\u4e00\u4e2a\u8d85\u957f\u7684\u5207\u7247\uff0c\u5207\u7247\u7684\u5143\u7d20\u7c7b\u578b\u4e3aint\uff0c\u5207\u7247\u4e2d\u7684\u5143\u7d20\u4e3a\u4e71\u5e8f\u6392\u5e8f\u3002\u9650\u65f65\u79d2\uff0c\u4f7f\u7528\u591a\u4e2agorou [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[7],"_links":{"self":[{"href":"https:\/\/blog.rrr.ink\/index.php?rest_route=\/wp\/v2\/posts\/94"}],"collection":[{"href":"https:\/\/blog.rrr.ink\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.rrr.ink\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.rrr.ink\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.rrr.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=94"}],"version-history":[{"count":1,"href":"https:\/\/blog.rrr.ink\/index.php?rest_route=\/wp\/v2\/posts\/94\/revisions"}],"predecessor-version":[{"id":95,"href":"https:\/\/blog.rrr.ink\/index.php?rest_route=\/wp\/v2\/posts\/94\/revisions\/95"}],"wp:attachment":[{"href":"https:\/\/blog.rrr.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=94"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.rrr.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=94"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.rrr.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=94"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}