+
+void intrusive_ptr_add_ref(Barrier* barrier)
+{
+ xbt_assert(barrier);
+ barrier->refcount_.fetch_add(1, std::memory_order_relaxed);
+}
+
+void intrusive_ptr_release(Barrier* barrier)
+{
+ xbt_assert(barrier);
+ if (barrier->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
+ std::atomic_thread_fence(std::memory_order_acquire);
+ delete barrier;
+ }
+}