singleton: double-check inside the lock

mohuishou / go-design-pattern

golang design pattern go 设计模式实现，包含 23 种常见的设计模式实现，同时这也是极客时间-设计模式之美的笔记

https://lailin.xyz/post/go-design-pattern.html

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Closed wandh closed 1 year ago

wandh commented 1 year ago

Double-check inside the lock, otherwise, there may be duplicate creations.