Function __libcpp_atomic_notify

system/lib/libcxx/src/atomic.cpp:166–174

   launder the value sequence through an atomic from our table. */

static void __libcpp_atomic_notify(void const volatile* __location) {
  auto const __entry = __libcpp_contention_state(__location);
  // The value sequence laundering happens on the next line below.
  __cxx_atomic_fetch_add(&__entry->__platform_state, __cxx_contention_t(1), memory_order_seq_cst);
  __libcpp_contention_notify(
      &__entry->__contention_state,
      &__entry->__platform_state,
      false /* when laundering, we can't handle notify_one */);
}
_LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(void const volatile* __location) noexcept {
  __libcpp_atomic_notify(__location);
}