+ press_t *presses = (press_t *)user_data;
+ return next_send(&presses[a]) < next_send(&presses[b]);
+}
+
+void create_press(press_t *presses, pheap_t *sleeps_heap, uint32_t timestamp,
+ u16_t seq) {
+ pheap_node_id_t i = ph_new_node(sleeps_heap);
+ if (i == 0) {
+ /* TODO: Don't drop new presses just because sleeps_heap is full of old
+ * presses. */
+ return;
+ }
+ presses[i].timestamp = timestamp;
+ presses[i].seq = seq;
+ presses[i].send_count = 0;
+ ph_insert_node(sleeps_heap, i);
+}
+
+int32_t next_scheduled_send(press_t *presses, pheap_t *sleeps_heap) {
+ pheap_node_id_t i = ph_peek_head(sleeps_heap);
+ if (i == 0)
+ return -1;
+ return next_send(&presses[i]);