||= 在 Ruby 线程中安全吗? [英] Is ||= in Ruby thread safe?

问题描述

不确定线程​​安全是否适用于 ||=.

Not sure if threads safety even applies to ||=.

最初阅读的是关于 ActiveSupport::Memoizable 并想知道那里的线程安全性.

Was originally reading about ActiveSupport::Memoizable and wondered about thread safety there.

推荐答案

这取决于实现.请注意 x ||= y 扩展为 x ||x = y，并且 x = y 仅在 x 为 false 或 nil 时执行>.

It depends on the implementation. Be aware that x ||= y expands to x || x = y, and that x = y is only executed if x is either false or nil.

话虽如此，Ruby 语言的 C 实现应该是完全线程安全的.

With that said, the C implementation of the Ruby language should be completely thread safe.

YARV 使用本机线程来实现并发，确实以真正的并行方式运行.但是，为了保持向后兼容性，引入了全局、解释器范围的锁.

YARV uses native threads in order to implement concurrency, which do run in true parallel. However, in order to maintain backward compatibility, a global, interpreter-wide lock was introduced.

然而，JRuby 不会对您的代码施加内部锁定，因此您必须在需要时手动同步您的调用.

JRuby, however, imposes no internal locking on your code, so you must manually synchronize your calls when needed.

有关详细信息，请参阅我针对该主题给出的另一个答案.此外，请阅读 Jörg W Mittag 的这个优秀回答，以更深入地了解各种 Ruby 实现的线程模型.

See another answer I've given about the subject for more details. Also, read this excellent answer by Jörg W Mittag for a more in-depth look at the threading models of the various Ruby implementations.

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