Function std::intrinsics::atomic_xchg_acqrel

pub unsafe extern "rust-intrinsic" fn atomic_xchg_acqrel<T>(
    dst: *mut T, 
    src: T
) -> T where
    T: Copy, 

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

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

将值存储在指定的内存位置，并返回旧值。

通过将 Ordering::AcqRel 作为 order 传递，可以通过 swap 方法在 atomic 类型上使用此内联函数的稳定版本。 例如， AtomicBool::swap.