{"id":207662,"date":"2025-07-08T11:31:33","date_gmt":"2025-07-08T03:31:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207662\/"},"modified":"2025-07-08T11:31:33","modified_gmt":"2025-07-08T03:31:33","slug":"%e4%bd%bf%e7%94%a8-waitgroup-%e6%b5%8b%e8%af%95%e7%ab%9e%e4%ba%89%e6%9d%a1%e4%bb%b6%e6%97%b6%e5%87%ba%e7%8e%b0%e6%84%8f%e5%a4%96%e8%a1%8c%e4%b8%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207662\/","title":{"rendered":"\u4f7f\u7528 WaitGroup \u6d4b\u8bd5\u7ade\u4e89\u6761\u4ef6\u65f6\u51fa\u73b0\u610f\u5916\u884c\u4e3a"},"content":{"rendered":"

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

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u4f7f\u7528 WaitGroup \u6d4b\u8bd5\u7ade\u4e89\u6761\u4ef6\u65f6\u51fa\u73b0\u610f\u5916\u884c\u4e3a<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-24 13:36:34<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5b66\u4e60Golang<\/span>\u8981\u52aa\u529b\uff0c\u4f46\u662f\u4e0d\u8981\u6025\uff01\u4eca\u5929\u7684\u8fd9\u7bc7\u6587\u7ae0\u300a\u4f7f\u7528 WaitGroup \u6d4b\u8bd5\u7ade\u4e89\u6761\u4ef6\u65f6\u51fa\u73b0\u610f\u5916\u884c\u4e3a\u300b<\/span>\u5c06\u4f1a\u4ecb\u7ecd\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u60f3\u6df1\u5165\u5b66\u4e60Golang<\/span>\uff0c\u53ef\u4ee5\u5173\u6ce8\u6211\uff01\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\u7684\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u80fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n

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

\u6211\u7684\u4efb\u52a1\u662f\u6a21\u62df go \u4e2d\u7684\u7ade\u4e89\u6761\u4ef6\u3002\u7136\u800c\uff0c\u6211\u9047\u5230\u4e86\u4e00\u4e2a\u6211\u65e0\u6cd5\u89e3\u91ca\u7684\u6848\u4f8b\u3002\u4e0b\u9762\u7684\u4ee3\u7801\u7247\u6bb5<\/p>\n

package main\n\nimport (\n    \"fmt\"\n    \"sync\"\n)\n\nvar value, totalOps, totalIncOps, totalDecOps int\n\nfunc main() {\n    fmt.Println(\"Total value: \", simulateRacing(10000))\n    fmt.Print(\"Total iterations: \", totalOps)\n    fmt.Print(\" of it, increments: \", totalIncOps)\n    fmt.Print(\", decrements: \", totalDecOps)\n}\n\n\/\/ Function to simulate racing condition\nfunc simulateRacing(iterationsNumber int) int {\n    value = 0\n    \/\/ Define WaitGroup\n    var waitGroup sync.WaitGroup\n    waitGroup.Add(2)\n\n    go increaseByOne(iterationsNumber, &waitGroup)\n    go decreaseByOne(iterationsNumber, &waitGroup)\n\n    waitGroup.Wait()\n\n    return value\n}\n\n\/\/ Function to do N iterations, each time increasing value by 1\nfunc increaseByOne(N int, waitGroup *sync.WaitGroup) {\n    for i := 0; i < N; i++ {\n        value++\n        \/\/ Collecting stats\n        totalOps++\n        totalIncOps++\n    }\n    waitGroup.Done()\n}\n\n\/\/ Same with decrease\nfunc decreaseByOne(N int, waitGroup *sync.WaitGroup) {\n    for i := 0; i < N; i++ {\n        value--\n        \/\/ Collecting stats\n        totalOps++\n        totalDecOps++\n    }\n    waitGroup.Done()\n}<\/pre>\n
\u6839\u636e\u6211\u7684\u7406\u89e3\uff0c\u5b83\u6bcf\u6b21\u90fd\u5e94\u8be5\u4ea7\u751f\u4e00\u81f4\uff08\u786e\u5b9a\u6027\uff09\u7684\u7ed3\u679c\uff0c\u56e0\u4e3a\u6211\u4eec\u6267\u884c\u76f8\u540c\u6570\u91cf\u7684\u589e\u91cf\u548c\u51cf\u91cf\uff0c\u5e76\u4f7f\u7528 waitgroup \u786e\u4fdd\u4e24\u4e2a\u51fd\u6570\u90fd\u4f1a\u6267\u884c\u3002<\/p>\n
\u4f46\u662f\uff0c\u6bcf\u6b21\u8f93\u51fa\u90fd\u4e0d\u540c\uff0c\u53ea\u6709\u9012\u589e\u548c\u9012\u51cf\u8ba1\u6570\u5668\u4fdd\u6301\u4e0d\u53d8\u3002 \u603b\u4ef7\u503c\uff1a2113 \u603b\u8fed\u4ee3\u6b21\u6570\uff1a17738 \u6b21\uff0c\u589e\u91cf\uff1a10000\uff0c\u51cf\u91cf\uff1a10000 \u548c \u603b\u4ef7\u503c\uff1a35 \u603b\u8fed\u4ee3\u6b21\u6570\uff1a10741 \u6b21\uff0c\u589e\u91cf\uff1a10000\uff0c\u51cf\u91cf\uff1a10000 <\/p>\n
\u4e5f\u8bb8\u4f60\u53ef\u4ee5\u5e2e\u6211\u89e3\u91ca\u4e00\u4e0b\u8fd9\u79cd\u884c\u4e3a\uff1f\u4e3a\u4ec0\u4e48\u603b\u8fed\u4ee3\u8ba1\u6570\u5668\u548c\u503c\u672c\u8eab\u662f\u4e0d\u786e\u5b9a\u7684\uff1f<\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u8fd9\u662f\u7ade\u4e89\u6761\u4ef6\u7684\u7ecf\u5178\u793a\u4f8b\u3002 value++<\/code> \u4e0d\u662f\u539f\u5b50\u64cd\u4f5c\uff0c\u56e0\u6b64\u4e0d\u80fd\u4fdd\u8bc1\u5728\u6ca1\u6709\u540c\u6b65\u7684\u60c5\u51b5\u4e0b\u4ece\u591a\u4e2a\u7ebf\u7a0b\u8c03\u7528\u65f6\u5b83\u4f1a\u6b63\u786e\u6216\u786e\u5b9a\u5730\u5de5\u4f5c\u3002<\/p>\n
\u4e3a\u4e86\u76f4\u89c2\u4e00\u4e9b\uff0cvalue++<\/code> \u6216\u591a\u6216\u5c11\u76f8\u5f53\u4e8e value = value + 1<\/code>\u3002\u60a8\u53ef\u4ee5\u5c06\u5176\u89c6\u4e3a\u4e09\u4e2a<\/em>\u64cd\u4f5c\uff0c\u800c\u4e0d\u662f\u4e00\u4e2a\uff1a\u5c06 value<\/code> \u4ece\u5185\u5b58\u52a0\u8f7d\u5230 cpu \u5bc4\u5b58\u5668\uff0c\u589e\u52a0\u5bc4\u5b58\u5668\u4e2d\u7684\u503c\uff08\u4e0d\u80fd\u76f4\u63a5\u4fee\u6539\u5185\u5b58\uff09\uff0c\u5c06\u503c\u5b58\u50a8\u56de\u5185\u5b58\u3002\u4e24\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u4f1a\u540c\u65f6\u52a0\u8f7d\u76f8\u540c\u7684\u503c\uff0c\u589e\u52a0\u5b83\uff0c\u5f97\u5230\u76f8\u540c\u7684\u7ed3\u679c\uff0c\u7136\u540e\u5c06\u5176\u5199\u56de\uff0c\u56e0\u6b64\u5b83\u5b9e\u9645\u4e0a\u5c06 value<\/code> \u52a0 1\uff0c\u800c\u4e0d\u662f\u52a0 2\u3002<\/p>\n
\u7531\u4e8e\u7ebf\u7a0b\u4e4b\u95f4\u7684\u64cd\u4f5c\u987a\u5e8f\u662f\u4e0d\u786e\u5b9a\u7684\uff0c\u56e0\u6b64\u7ed3\u679c\u4e5f\u662f\u4e0d\u786e\u5b9a\u7684\u3002<\/p>\n
totalops<\/code> \u4e5f\u4f1a\u4ea7\u751f\u76f8\u540c\u7684\u6548\u679c\u3002\u4f46\u662f\uff0ctotalincops<\/code> \u548c totaldecops<\/code> \u53ea\u80fd\u7531\u5355\u4e2a\u7ebf\u7a0b\u4fee\u6539\/\u8bfb\u53d6\uff0c\u56e0\u6b64\u8fd9\u91cc\u4e0d\u5b58\u5728\u7ade\u4e89\uff0c\u5e76\u4e14\u5b83\u4eec\u7684\u6700\u7ec8\u503c\u662f\u786e\u5b9a\u6027\u7684\u3002<\/p>\n
\u56e0\u4e3a\u5bf9\u53d8\u91cf value\u3001totalops\u3001totalincops \u548ctotaldecops \u7684\u64cd\u4f5c\u662f\u672a\u9501\u5b9a<\/p>\n
\u6dfb\u52a0\u4e92\u65a5\u9501\u5e94\u8be5\u4f1a\u6709\u6240\u5e2e\u52a9\u3002 go \u7ade\u8d5b\u68c0\u6d4b\u5668\u529f\u80fd\u4f1a\u53d1\u73b0\u6b64\u6545\u969c<\/p>\n
var m sync.Mutex\n\nfunc increaseByOne(N int, waitGroup *sync.WaitGroup) {\n    for i := 0; i < N; i++ {\n        m.Lock()\nvalue++\n        \/\/ Collecting stats\n        totalOps++\n        totalIncOps++\n        m.Unlock()\n    }\n    waitGroup.Done()\n}\n\n\/\/ Same with decrease\nfunc decreaseByOne(N int, waitGroup *sync.WaitGroup) {\n    for i := 0; i < N; i++ {\n        m.Lock()\n        value--\n        \/\/ Collecting stats\n        totalOps++\n        totalDecOps++\n        m.Unlock()\n    }\n    waitGroup.Done()\n}<\/pre>\n
\u4e0a\u8ff0\u65b9\u6cd5\u7684\u66ff\u4ee3\u65b9\u6cd5\u662f\u4f7f\u7528 sync.atomic \u4f5c\u4e3a\u8ba1\u6570\u5668<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300a\u4f7f\u7528 WaitGroup \u6d4b\u8bd5\u7ade\u4e89\u6761\u4ef6\u65f6\u51fa\u73b0\u610f\u5916\u884c\u4e3a\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/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-207662","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207662","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=207662"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207662\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207662"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207662"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}