19/12/11 13:46:34.56 iOg65oSz.net
はい。
URLﾘﾝｸ(timsong-cpp.github.io)
> The execution of a program contains a data race if it contains two
> potentially concurrent conflicting actions, at least one of which is
> not atomic, and neither happens before the other, except for the
> special case for signal handlers described below. Any such data race
> results in undefined behavior.