Are C Arrays Thread Safe

4 Answers. The two are equally safe. Provided no element is accessed from multiple threads you’re OK.

Is Unordered_set thread safe?

No, the standard containers are not thread safe.

Are C++ strings thread safe?

The standard doesn’t guarantee anything about threads. So to do anything with threads in C++, you have to rely on implementation-defined guarantees. And Then you can safely use std::string because each implementation tells you whether or not it is safe to use in a threaded environment.