Function core::intrinsics::atomic_cxchgweak_acq

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

🔬 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

如果当前值与 old 值相同，则存储一个值。

通过将 Ordering::Acquire 用作 success 和 failure 参数，可以通过 compare_exchange_weak 方法在 atomic 类型上使用此内部函数的稳定版本。

例如，AtomicBool::compare_exchange_weak。