Function std::intrinsics::atomic_cxchgweak

pub unsafe extern "rust-intrinsic" fn atomic_cxchgweak<T>(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

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_weak method by passing Ordering::SeqCst as both the success and failure parameters. For example, AtomicBool::compare_exchange_weak.