* Should be called with session registry mutex held.
*/
int ust_registry_create_event(struct ust_registry_session *session,
- struct ust_registry_channel *chan,
- int session_objd, int channel_objd, char *name, char *sig,
- size_t nr_fields, struct ustctl_field *fields, int loglevel,
+ uint64_t chan_key, int session_objd, int channel_objd, char *name,
+ char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel,
char *model_emf_uri, uint32_t *event_id)
{
int ret;
struct cds_lfht_node *nptr;
struct ust_registry_event *event = NULL;
+ struct ust_registry_channel *chan;
assert(session);
- assert(chan);
assert(name);
assert(sig);
goto error;
}
+ rcu_read_lock();
+
+ chan = ust_registry_channel_find(session, chan_key);
+ if (!chan) {
+ ret = -EINVAL;
+ goto error_unlock;
+ }
+
/* Check if we've reached the maximum possible id. */
if (ust_registry_is_max_id(chan->used_event_id)) {
ret = -ENOENT;
- goto error;
+ goto error_unlock;
}
event = alloc_event(session_objd, channel_objd, name, sig, nr_fields,
fields, loglevel, model_emf_uri);
if (!event) {
ret = -ENOMEM;
- goto error;
+ goto error_unlock;
}
event->id = ust_registry_get_next_event_id(chan);
"chan_objd: %u, sess_objd: %u", event->name, event->signature,
event->id, event->channel_objd, event->session_objd);
- rcu_read_lock();
/*
* This is an add unique with a custom match function for event. The node
* are matched using the event name and signature.
if (event_id) {
*event_id = event->id;
}
- rcu_read_unlock();
/* Append to metadata */
ret = ust_metadata_event_statedump(session, chan, event);
if (ret) {
ERR("Error appending event metadata (errno = %d)", ret);
+ rcu_read_unlock();
return ret;
}
+ rcu_read_unlock();
return 0;
error_unlock:
return;
}
-/*
- * Initialize registry with default values.
- */
-void ust_registry_channel_init(struct ust_registry_session *session,
- struct ust_registry_channel *chan)
-{
- assert(chan);
-
- memset(chan, 0, sizeof(struct ust_registry_channel));
-
- chan->ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
- assert(chan->ht);
-
- /* Set custom match function. */
- chan->ht->match_fct = ht_match_event;
-}
-
/*
* Destroy every element of the registry and free the memory. This does NOT
* free the registry pointer since it might not have been allocated before so
*
* This MUST be called within a RCU read side lock section.
*/
-void ust_registry_channel_destroy(struct ust_registry_session *session,
- struct ust_registry_channel *chan)
+static void destroy_channel(struct ust_registry_channel *chan)
{
struct lttng_ht_iter iter;
struct ust_registry_event *event;
ust_registry_destroy_event(chan, event);
}
lttng_ht_destroy(chan->ht);
+
+ free(chan);
}
/*
* Initialize registry with default values.
*/
-int ust_registry_session_init(struct ust_registry_session *session,
+int ust_registry_channel_add(struct ust_registry_session *session,
+ uint64_t key)
+{
+ int ret = 0;
+ struct ust_registry_channel *chan;
+
+ assert(session);
+
+ chan = zmalloc(sizeof(*chan));
+ if (!chan) {
+ PERROR("zmalloc ust registry channel");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ chan->ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
+ if (!chan->ht) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ /* Set custom match function. */
+ chan->ht->match_fct = ht_match_event;
+
+ rcu_read_lock();
+ lttng_ht_node_init_u64(&chan->node, key);
+ lttng_ht_add_unique_u64(session->channels, &chan->node);
+ rcu_read_unlock();
+
+error:
+ return ret;
+}
+
+/*
+ * Find a channel in the given registry. RCU read side lock MUST be acquired
+ * before calling this function and as long as the event reference is kept by
+ * the caller.
+ *
+ * On success, the pointer is returned else NULL.
+ */
+struct ust_registry_channel *ust_registry_channel_find(
+ struct ust_registry_session *session, uint64_t key)
+{
+ struct lttng_ht_node_u64 *node;
+ struct lttng_ht_iter iter;
+ struct ust_registry_channel *chan = NULL;
+
+ assert(session);
+ assert(session->channels);
+
+ lttng_ht_lookup(session->channels, &key, &iter);
+ node = lttng_ht_iter_get_node_u64(&iter);
+ if (!node) {
+ goto end;
+ }
+ chan = caa_container_of(node, struct ust_registry_channel, node);
+
+end:
+ return chan;
+}
+
+/*
+ * Remove channel using key from registry and free memory.
+ */
+void ust_registry_channel_del_free(struct ust_registry_session *session,
+ uint64_t key)
+{
+ struct lttng_ht_iter iter;
+ struct ust_registry_channel *chan;
+
+ assert(session);
+
+ rcu_read_lock();
+ chan = ust_registry_channel_find(session, key);
+ if (!chan) {
+ goto end;
+ }
+
+ iter.iter.node = &chan->node.node;
+ lttng_ht_del(session->channels, &iter);
+
+ destroy_channel(chan);
+
+end:
+ rcu_read_unlock();
+ return;
+}
+
+/*
+ * Initialize registry with default values and set the newly allocated session
+ * pointer to sessionp.
+ *
+ * Return 0 on success and sessionp is set or else return -1 and sessionp is
+ * kept untouched.
+ */
+int ust_registry_session_init(struct ust_registry_session **sessionp,
struct ust_app *app,
uint32_t bits_per_long,
uint32_t uint8_t_alignment,
int byte_order)
{
int ret;
+ struct ust_registry_session *session;
- assert(session);
+ assert(sessionp);
+ assert(app);
- memset(session, 0, sizeof(struct ust_registry_session));
+ session = zmalloc(sizeof(*session));
+ if (!session) {
+ PERROR("zmalloc ust registry session");
+ goto error;
+ }
pthread_mutex_init(&session->lock, NULL);
session->bits_per_long = bits_per_long;
session->long_alignment = long_alignment;
session->byte_order = byte_order;
+ session->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
+ if (!session->channels) {
+ goto error;
+ }
+
ret = lttng_uuid_generate(session->uuid);
if (ret) {
ERR("Failed to generate UST uuid (errno = %d)", ret);
goto error;
}
+ *sessionp = session;
+
return 0;
error:
void ust_registry_session_destroy(struct ust_registry_session *reg)
{
int ret;
+ struct lttng_ht_iter iter;
+ struct ust_registry_channel *chan;
/* On error, EBUSY can be returned if lock. Code flow error. */
ret = pthread_mutex_destroy(®->lock);
assert(!ret);
+ rcu_read_lock();
+ /* Destroy all event associated with this registry. */
+ cds_lfht_for_each_entry(reg->channels->ht, &iter.iter, chan, node.node) {
+ /* Delete the node from the ht and free it. */
+ ret = lttng_ht_del(reg->channels, &iter);
+ assert(!ret);
+ destroy_channel(chan);
+ }
+ lttng_ht_destroy(reg->channels);
+ rcu_read_unlock();
+
free(reg->metadata);
}
projects / lttng-tools.git / blobdiff