Function std::intrinsics::atomic_cxchg_acq

pub unsafe extern "rust-intrinsic" fn atomic_cxchg_acq<T>(
    dst: *mut T, 
    old: T, 
    src: T
) -> (T, bool)

🔬 This is a nightly-only experimental API. (core_intrinsics #0)

intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library

Stores a value if the current value is the same as the old value. The stabilized version of this intrinsic is available on the std::sync::atomic types via the compare_exchange method by passing Ordering::Acquire as both the success and failure parameters. For example, AtomicBool::compare_exchange.