/**
* Free all request items
* @param tail Pointer to request queue tail pointer
*/
static void
mqtt_clear_requests(struct mqtt_request_t **tail)
{
struct mqtt_request_t *iter, *next;
LWIP_ASSERT("mqtt_clear_requests: tail != NULL", tail != NULL);
for (iter = *tail; iter != NULL; iter = next) {
next = iter->next;
mqtt_delete_request(iter);
}
*tail = NULL;
}
/**
* Handle requests timeout
* @param tail Pointer to request queue tail pointer
* @param t Time since last call in seconds
*/
static void
mqtt_request_time_elapsed(struct mqtt_request_t **tail, u8_t t)
{
struct mqtt_request_t *r = *tail;
LWIP_ASSERT("mqtt_request_time_elapsed: tail != NULL", tail != NULL);
while (t > 0 && r != NULL) {
if (t >= r->timeout_diff) {
t -= (u8_t)r->timeout_diff;
/* Unchain */
*tail = r->next;
/* Notify upper layer about timeout */
if (r->cb != NULL) {
r->cb(r->arg, ERR_TIMEOUT);
}
mqtt_delete_request(r);
/* Tail might be be modified in callback, so re-read it in every iteration */
r = *(struct mqtt_request_t * const volatile *)tail;
} else {
r->timeout_diff -= t;
t = 0;
}
}
}
