memory_order
atomic_thread_fence(memory_order __order __unused)
atomic_signal_fence(memory_order __order __unused)
memory_order __order)
atomic_flag_clear_explicit(volatile atomic_flag *__object, memory_order __order)
atomic_signal_fence(std::memory_order::memory_order_seq_cst);
atomic_signal_fence(std::memory_order::memory_order_seq_cst);