问题
Are Kotlin singletons (more specifically, object declarations) thread-safe by construction? If not, what is the best practice to write thread safe singletons in Kotlin?
I would guess they are, but I haven't been able to find any explicit statement about it in the docs.
回答1:
Kotlin "object" is thread-safe by construction. As you can see in any decompile/dumping tool, declared object is just final class with static instance initialization + language syntax sugar to simplify instance access
来源：https://stackoverflow.com/questions/30179793/are-kotlins-singletons-thread-safe