Function __libcpp_atomic_wait

system/lib/libcxx/src/atomic.cpp:185–189

  return __libcpp_contention_monitor_for_wait(&__entry->__contention_state, &__entry->__platform_state);
}
_LIBCPP_EXPORTED_FROM_ABI void
__libcpp_atomic_wait(void const volatile* __location, __cxx_contention_t __old_value) noexcept {
  auto const __entry = __libcpp_contention_state(__location);
  __libcpp_contention_wait(&__entry->__contention_state, &__entry->__platform_state, __old_value);
}

/* When the incoming atomic happens to be the platform wait size, we still need to use the
   table for the contention detection, but we can use the atomic directly for the wait. */