Function atomic_umax 

pub unsafe fn atomic_umax<T: Copy, const ORD: AtomicOrdering>(
    dst: *mut T,
    src: T,
) -> T

🔬This is a nightly-only experimental API. (core_intrinsics)

Maximum with the current value using an unsigned comparison. T must be an unsigned integer type.

The stabilized version of this intrinsic is available on the [atomic] unsigned integer types via the fetch_max method. For example, [AtomicU32::fetch_max].