atomic_xsub_acqrel in core::intrinsics - Rust
Description: Subtract from the current value, returning the previous value. `T` must be an integer or pointer type. If `T` is a pointer type, the provenance of `src` is ignored: both the return value and the new value stored at `*dst` will have the provenance of the old value stored there.

# Function atomic_xsub_acqrel

Source

    pub unsafe fn atomic_xsub_acqrel<T: Copy>(dst: *mut T, src: T) -> T

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

Subtract from the current value, returning the previous value. `T` must be an integer or pointer type. If `T` is a pointer type, the provenance of `src` is ignored: both the return value and the new value stored at `*dst` will have the provenance of the old value stored there.

The stabilized version of this intrinsic is available on the `atomic` types via the `fetch_sub` method by passing `Ordering::AcqRel` as the `order`. For example, `AtomicIsize::fetch_sub`.