/****************************************************************************
** **
** Name: _nas_timer_db_insert_entry() **
** **
** Description: Inserts the entry with the given identifier into the **
** queue of active timer entries and restarts the system **
** timer if the new entry is the next entry for which the **
** timer should be scheduled to expire. **
** **
** Inputs: id: Identifier of the new entry **
** te: Pointer to the entry to be inserted **
** Others: None **
** **
** Outputs: None **
** Return: None **
** Others: _nas_timer_db **
** **
***************************************************************************/
static void
_nas_timer_db_insert_entry (
int id,
nas_timer_entry_t * te)
{
struct itimerval it;
struct timespec ts;
struct timeval current_time;
int restart;
/*
* Enqueue the new timer entry
*/
_nas_timer_db.tq[id].id = id;
_nas_timer_db.tq[id].entry = te;
/*
* Save its interval timer value
*/
it.it_interval.tv_sec = it.it_interval.tv_usec = 0;
it.it_value = te->tv;
/*
* Update its interval timer value
*/
clock_gettime (CLOCK_MONOTONIC, &ts);
current_time.tv_sec = ts.tv_sec;
current_time.tv_usec = ts.tv_nsec / 1000;
/*
* tv = tv + time()
*/
_nas_timer_add (&te->tv, ¤t_time, &te->tv);
/*
* Insert the new timer entry into the list of active entries
*/
nas_timer_lock_db ();
restart = _nas_timer_db_insert (&_nas_timer_db.tq[id]);
nas_timer_unlock_db ();
#if ENABLE_ITTI == 0
if (restart) {
/*
* The new entry is the first entry of the list;
* * * * restart the system timer
*/
setitimer (ITIMER_REAL, &it, 0);
}
#else
(void)(restart);
#endif
}
/****************************************************************************
** **
** Name: _nas_timer_db_remove_entry() **
** **
** Description: Removes the entry with the given identifier from the **
** queue of active timer entries and restarts the system **
** timer if the entry was the next entry for which the timer **
** was scheduled to expire. **
** **
** Inputs: id: Identifier of the entry to be removed **
** Others: None **
** **
** Outputs: None **
** Return: A pointer to the removed entry **
** Others: _nas_timer_db **
** **
***************************************************************************/
static nas_timer_entry_t *_nas_timer_db_remove_entry(int id)
{
int restart;
/* The identifier of the timer is valid within the timer queue */
assert(_nas_timer_db.tq[id].id == id);
/* Remove the timer entry from the list of active entries */
nas_timer_lock_db();
restart = _nas_timer_db_remove(&_nas_timer_db.tq[id]);
nas_timer_unlock_db();
if (restart) {
int rc;
/* The entry was the first entry of the list;
* the system timer needs to be restarted */
struct itimerval it;
struct timeval tv;
struct timespec ts;
it.it_interval.tv_sec = it.it_interval.tv_usec = 0;
clock_gettime(CLOCK_MONOTONIC, &ts);
tv.tv_sec = ts.tv_sec;
tv.tv_usec = ts.tv_nsec/1000;
/* tv = tv - time() */
rc = _nas_timer_sub(&_nas_timer_db.head->entry->tv, &tv, &it.it_value);
#if defined(ENABLE_ITTI)
timer_remove(_nas_timer_db.head->entry->timer_id);
(void) (rc);
#else
if (rc < 0) {
/* The system timer should have already expired */
_nas_timer_handler(SIGALRM);
} else {
/* Restart the system timer */
setitimer(ITIMER_REAL, &it, 0);
}
#endif
}
/* Return a pointer to the removed entry */
return (_nas_timer_db.tq[id].entry);
}
