static
int enqueue_dropped_notification(
struct lttng_notification_channel *channel)
{
int ret = 0;
struct pending_notification *pending_notification;
struct cds_list_head *last_element =
channel->pending_notifications.list.prev;
pending_notification = caa_container_of(last_element,
struct pending_notification, node);
if (!pending_notification->notification) {
/*
* The last enqueued notification indicates dropped
* notifications; there is nothing to do as we group
* dropped notifications together.
*/
goto end;
}
if (channel->pending_notifications.count >=
DEFAULT_CLIENT_MAX_QUEUED_NOTIFICATIONS_COUNT &&
pending_notification->notification) {
/*
* Discard the last enqueued notification to indicate
* that notifications were dropped at this point.
*/
lttng_notification_destroy(
pending_notification->notification);
pending_notification->notification = NULL;
goto end;
}
pending_notification = zmalloc(sizeof(*pending_notification));
if (!pending_notification) {
ret = -1;
goto end;
}
CDS_INIT_LIST_HEAD(&pending_notification->node);
cds_list_add(&pending_notification->node,
&channel->pending_notifications.list);
channel->pending_notifications.count++;
end:
return ret;
}
static
int enqueue_notification_from_current_message(
struct lttng_notification_channel *channel)
{
int ret = 0;
struct lttng_notification *notification;
struct pending_notification *pending_notification;
if (channel->pending_notifications.count >=
DEFAULT_CLIENT_MAX_QUEUED_NOTIFICATIONS_COUNT) {
/* Drop the notification. */
ret = enqueue_dropped_notification(channel);
goto end;
}
pending_notification = zmalloc(sizeof(*pending_notification));
if (!pending_notification) {
ret = -1;
goto error;
}
CDS_INIT_LIST_HEAD(&pending_notification->node);
notification = create_notification_from_current_message(channel);
if (!notification) {
ret = -1;
goto error;
}
pending_notification->notification = notification;
cds_list_add(&pending_notification->node,
&channel->pending_notifications.list);
channel->pending_notifications.count++;
end:
return ret;
error:
free(pending_notification);
goto end;
}
void deq_push_r(struct cds_list_head *e, struct deq *p)
{
cds_list_add(e, &p->chain);
}
void deq_push_r(struct cds_list_head *e, struct deq *p)
{
spin_lock(&p->lock);
cds_list_add(e, &p->chain);
spin_unlock(&p->lock);
}