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双重检查加锁单例模式 是否需要加 volatile 关键字修饰？ #5

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SummerXSH opened this issue May 6, 2019 · 2 comments
Open

双重检查加锁单例模式 是否需要加 volatile 关键字修饰？ #5

SummerXSH opened this issue May 6, 2019 · 2 comments

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@SummerXSH
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在双重检查加锁单例模式 是否需要加 volatile 关键字修饰来保证可见性问题？
@youlookwhat
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严格来说需要加，可以加上volatile 关键字修饰。

被volatile修饰的变量不参与指令重排, 在操作volatile变量时 在变量操作之前的代码一定是执行完毕并且是可见的, 在变量操作之后的代码一定是还没有被执行的。

@SummerXSH SummerXSH reopened this May 8, 2019
@beautifulrainday
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应该是要的把

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@youlookwhat @beautifulrainday @SummerXSH