- /* Set the flag if want_notif_if_full was the only ntf requested */
- f->shr->has_deq_ntf =
- f->shr->want_deq_ntf == SVM_FIFO_WANT_DEQ_NOTIF_IF_FULL;
- svm_fifo_del_want_deq_ntf (f, SVM_FIFO_WANT_DEQ_NOTIF);
+ u32 want_deq_ntf = svm_fifo_get_want_deq_ntf (f);
+ /* Set the flag if want ntf if full or empty was requested */
+ if (want_deq_ntf &
+ (SVM_FIFO_WANT_DEQ_NOTIF_IF_FULL | SVM_FIFO_WANT_DEQ_NOTIF_IF_EMPTY))
+ clib_atomic_store_rel_n (&f->shr->has_deq_ntf, 1);
+ if (want_deq_ntf & SVM_FIFO_WANT_DEQ_NOTIF)
+ svm_fifo_del_want_deq_ntf (f, SVM_FIFO_WANT_DEQ_NOTIF);
+}
+
+/**
+ * Get has dequeue notification flag
+ *
+ * Done atomically with acquire memory ordering
+ *
+ * @param f fifo
+ * @return has_deq_ntf flag
+ */
+static inline u32
+svm_fifo_has_deq_ntf (svm_fifo_t *f)
+{
+ return clib_atomic_load_acq_n (&f->shr->has_deq_ntf);