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双检锁是不是应该在外层还有一个if ==nil的判断呢? #1

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davichi11 opened this issue Nov 2, 2018 · 2 comments

davichi11 commented Nov 2, 2018

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silsuer commented Nov 2, 2018

哪个位置？我简单过了一遍，好像没有看到缺少的位置

bkkkc commented Feb 25, 2019

看了作者有写的，不过描述有点问题，并不是每次都需要判断两次，有实例后只有一次判断

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