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TransmittableThreadLocal 是否线程安全 #175

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xingguang2013 opened this issue May 19, 2020 · 2 comments
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TransmittableThreadLocal 是否线程安全 #175

xingguang2013 opened this issue May 19, 2020 · 2 comments
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@oldratlee
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🔰 first nice issue 👍 ❓question Further information is requested

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@xingguang2013
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如题， TransmittableThreadLocal 类是否是线程安全的？查阅资料没有找到相关说明
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oldratlee commented May 19, 2020 •
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简单的回答

TransmittableThreadLocal是线程安全的。 @xingguang2013

关于库的线程安全性声明

  • 对于涉及多线程的库来说（如ThreadLocal），缺省要是线程安全，否则就是 BUG。
  • 即，如不是线程安全，则要显式声明出来。

更完整的回答

库的线程安全，是以正确使用为前提，还要加上使用者相关知识的了解，如：

  • 对ThreadLocal的了解（这是个具体主题 学习）
  • 对线程安全/并发（这是个通用主题 学习）

比如 使用ThreadLocal时，取出ThreadLocal的值（对象引用）并传到其它线程，就要使用者注意额外的线程安全问题了。

更多了解可以看一下TTL的资料/文档： @xingguang2013 ❤️

@oldratlee oldratlee self-assigned this May 19, 2020
@oldratlee oldratlee added the ❓question Further information is requested label May 19, 2020
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感谢感谢

@oldratlee oldratlee mentioned this issue Nov 18, 2020
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