Function openat2::has_openat2_cached

pub fn has_openat2_cached() -> bool

A cached version of has_openat2().

This is equivalent to has_openat2(), except that the result is cached after the first call for efficiency.

Note that the result is cached using an atomic data type, without locking. As a result, if multiple threads call this function concurrently, has_openat2() may be called multiple times.