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feat: 新增Once的文章小结
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src/essential/impl/sync/2.once.md

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@@ -76,3 +76,8 @@ func (o *Once) doSlow(f func()) {
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5. 更新`done`
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6. 释放锁
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## 小结
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`sync.Once` 是一个非常简洁而高效的同步工具,它确保了并发环境下某个操作只执行一次,从而避免了重复工作或资源的浪费。

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