Function update_dlg_timer

modules/dialog/dlg_timer.c:552–580

returns : 0 - dialog was inserted in timer list with the new timeout 1 - dialog was inserted in timer list with the new timeout -1 - failure (dialog is expired, so it cannot be added again) */

     1 - dialog was inserted in timer list with the new timeout 
    -1 - failure (dialog is expired, so it cannot be added again) */
int update_dlg_timer( struct dlg_tl *tl, int timeout )
{
	int ret;

	lock_get( d_timer->lock);

	if ( tl->next == FAKE_DIALOG_TL ) {
		/* previously removed from timer list - we will not add it again */
		lock_release( d_timer->lock);
		return 0;
	}

	if ( tl->next ) {
		if (tl->prev==0) {
			lock_release( d_timer->lock);
			return -1;
		}
		remove_dlg_timer_unsafe(tl);
		ret = 0;
	} else {
		ret = 1;
	}

	tl->timeout = get_ticks()+timeout;
	insert_gen_timer_unsafe( d_timer, tl );

	lock_release( d_timer->lock);
	return ret;
}

static inline struct dlg_tl* _get_gen_expired_dlgs(struct dlg_timer *timer, unsigned int time)
{