git.scottworley.com Git - tattlekey/blob - client/press.c

   1 #include "press.h"
   2 #include "blink.h"
   3
   4 static uint32_t next_send(press_t *s) {
   5   return s->timestamp + (1 << s->send_count) - 1;
   6 }
   7
   8 static bool next_send_less_than(void *user_data, pheap_node_id_t a,
   9                                 pheap_node_id_t b) {
  10   press_t *presses = (press_t *)user_data;
  11   return next_send(&presses[a]) < next_send(&presses[b]);
  12 }
  13
  14 press_pile_t *create_press_pile() {
  15   press_pile_t *pp = (press_pile_t *)malloc(sizeof(press_pile_t));
  16   if (pp == NULL)
  17     signal_error_by_blinking();
  18   pp->presses = calloc(PICO_PHEAP_MAX_ENTRIES, sizeof(press_t));
  19   if (pp->presses == NULL)
  20     signal_error_by_blinking();
  21   pp->sleeps_heap =
  22       ph_create(PICO_PHEAP_MAX_ENTRIES, next_send_less_than, pp->presses);
  23   if (pp->sleeps_heap == NULL)
  24     signal_error_by_blinking();
  25   return pp;
  26 }
  27
  28 void add_press(press_pile_t *pp, press_t *press) {
  29   pheap_node_id_t i = ph_new_node(pp->sleeps_heap);
  30   if (i == 0) {
  31     /* TODO: Don't drop new presses just because sleeps_heap is full of old
  32      * presses. */
  33     return;
  34   }
  35   pp->presses[i] = *press;
  36   ph_insert_node(pp->sleeps_heap, i);
  37 }
  38
  39 int32_t next_scheduled_send(press_pile_t *pp) {
  40   pheap_node_id_t i = ph_peek_head(pp->sleeps_heap);
  41   if (i == 0)
  42     return -1;
  43   return next_send(&pp->presses[i]);
  44 }
  45
  46 bool get_press_due_for_resend(press_pile_t *pp, uint32_t now, press_t *press) {
  47   pheap_node_id_t i = ph_peek_head(pp->sleeps_heap);
  48   if (i == 0 || next_send(&pp->presses[i]) > now)
  49     return false;
  50   if (ph_remove_head(pp->sleeps_heap, true) != i)
  51     signal_error_by_blinking();
  52   *press = pp->presses[i];
  53   return true;
  54 }