Java中的volatile int是否是线程安全的？ [英] Is a volatile int in Java thread-safe?

问题描述

Java线程安全中是volatile int 吗？也就是说，可以安全地读取和写入而不锁定吗？

Is a volatile int in Java thread-safe? That is, can it be safely read from and written to without locking?

推荐答案

是的，你可以从中读取并写入它安全 - 但你不能做任何复合，比如安全地增加它，因为这是一个读/修改/写周期。还有一个问题是它如何与其他变量的访问进行交互。

Yes, you can read from it and write to it safely - but you can't do anything compound such as incrementing it safely, as that's a read/modify/write cycle. There's also the matter of how it interacts with access to other variables.

volatile的确切性质令人困惑（参见 JLS的内存模型部分了解更多详情） - 我个人通常使用 AtomicInteger ，这是确保我做对的更简单方法。

The precise nature of volatile is frankly confusing (see the memory model section of the JLS for more details) - I would personally generally use AtomicInteger instead, as a simpler way of making sure I get it right.

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