/*
* This hash table contains the mapping between the session id of the sessiond
- * and the relayd session id. Element of the ht are indexed by sessiond_id.
+ * and the relayd session id. Element of the ht are indexed by sessiond session
+ * id.
*
* Node can be added when a relayd communication is opened in the sessiond
* thread.
DBG("Consumer destroy and close relayd socket pair");
+ /* Loockup for a relayd node in the session id map hash table. */
lttng_ht_lookup(relayd_session_id_ht,
- (void *)((unsigned long) relayd->session_id), &iter);
+ (void *)((unsigned long) relayd->sessiond_session_id), &iter);
node = lttng_ht_iter_get_node_ulong(&iter);
if (node != NULL) {
/* We assume the relayd is being or is destroyed */
return;
}
- ret = lttng_ht_del(relayd_session_id_ht, &iter);
- if (ret != 0) {
- /* We assume the relayd is being or is destroyed */
- return;
- }
+ /*
+ * Try to delete it from the relayd session id ht. The return value is of
+ * no importance since either way we are going to try to delete the relayd
+ * from the global relayd_ht.
+ */
+ lttng_ht_del(relayd_session_id_ht, &iter);
iter.iter.node = &relayd->node.node;
ret = lttng_ht_del(consumer_data.relayd_ht, &iter);
}
lttng_ht_destroy(consumer_data.relayd_ht);
+ /* The destroy_relayd call makes sure that this ht is empty here. */
+ lttng_ht_destroy(relayd_session_id_ht);
rcu_read_unlock();
}
lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
goto error;
}
+ relayd->sessiond_session_id = (uint64_t) sessiond_id;
}
/* Poll on consumer socket. */
* grab the socket lock since the relayd object is not yet visible.
*/
ret = relayd_create_session(&relayd->control_sock,
- &relayd->session_id);
+ &relayd->relayd_session_id);
if (ret < 0) {
goto error;
}
goto error;
}
- relayd_id_node->relayd_id = relayd->session_id;
+ relayd_id_node->relayd_id = relayd->relayd_session_id;
relayd_id_node->sessiond_id = (uint64_t) sessiond_id;
- /* Indexed by session id of the session daemon. */
+ /* Indexed by session id of the sessiond. */
lttng_ht_node_init_ulong(&relayd_id_node->node,
relayd_id_node->sessiond_id);
rcu_read_lock();
return ret;
}
+/*
+ * Search for a relayd associated to the session id and return the reference.
+ *
+ * A rcu read side lock MUST be acquire before calling this function and locked
+ * until the relayd object is no longer necessary.
+ */
+static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id)
+{
+ struct lttng_ht_iter iter;
+ struct lttng_ht_node_ulong *node;
+ struct consumer_relayd_sock_pair *relayd = NULL;
+ struct consumer_relayd_session_id *session_id_map;
+
+ /* Get the session id map. */
+ lttng_ht_lookup(relayd_session_id_ht, (void *)((unsigned long) id), &iter);
+ node = lttng_ht_iter_get_node_ulong(&iter);
+ if (node == NULL) {
+ goto end;
+ }
+
+ session_id_map = caa_container_of(node, struct consumer_relayd_session_id,
+ node);
+
+ /* Iterate over all relayd since they are indexed by net_seq_idx. */
+ cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd,
+ node.node) {
+ if (relayd->relayd_session_id == session_id_map->relayd_id) {
+ /* Found the relayd. There can be only one per id. */
+ break;
+ }
+ }
+
+end:
+ return relayd;
+}
+
/*
* Check if for a given session id there is still data needed to be extract
* from the buffers.
struct lttng_ht_iter iter;
struct lttng_ht *ht;
struct lttng_consumer_stream *stream;
- struct consumer_relayd_sock_pair *relayd;
+ struct consumer_relayd_sock_pair *relayd = NULL;
int (*data_pending)(struct lttng_consumer_stream *);
DBG("Consumer data pending command on session id %" PRIu64, id);
/* Ease our life a bit */
ht = consumer_data.stream_list_ht;
+ relayd = find_relayd_by_session_id(id);
+ if (relayd) {
+ /* Send init command for data pending. */
+ pthread_mutex_lock(&relayd->ctrl_sock_mutex);
+ ret = relayd_begin_data_pending(&relayd->control_sock,
+ relayd->relayd_session_id);
+ pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
+ if (ret < 0) {
+ /* Communication error thus the relayd so no data pending. */
+ goto data_not_pending;
+ }
+ }
+
cds_lfht_for_each_entry_duplicate(ht->ht,
ht->hash_fct((void *)((unsigned long) id), lttng_ht_seed),
ht->match_fct, (void *)((unsigned long) id),
/* If this call fails, the stream is being used hence data pending. */
ret = stream_try_lock(stream);
if (!ret) {
- goto data_not_pending;
+ goto data_pending;
}
/*
ret = data_pending(stream);
if (ret == 1) {
pthread_mutex_unlock(&stream->lock);
- goto data_not_pending;
+ goto data_pending;
}
}
/* Relayd check */
- if (stream->net_seq_idx != -1) {
- relayd = consumer_find_relayd(stream->net_seq_idx);
- if (!relayd) {
- /*
- * At this point, if the relayd object is not available for the
- * given stream, it is because the relayd is being cleaned up
- * so every stream associated with it (for a session id value)
- * are or will be marked for deletion hence no data pending.
- */
- pthread_mutex_unlock(&stream->lock);
- goto data_not_pending;
- }
-
+ if (relayd) {
pthread_mutex_lock(&relayd->ctrl_sock_mutex);
if (stream->metadata_flag) {
ret = relayd_quiescent_control(&relayd->control_sock);
pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
if (ret == 1) {
pthread_mutex_unlock(&stream->lock);
- goto data_not_pending;
+ goto data_pending;
}
}
pthread_mutex_unlock(&stream->lock);
}
+ if (relayd) {
+ unsigned int is_data_inflight = 0;
+
+ /* Send init command for data pending. */
+ pthread_mutex_lock(&relayd->ctrl_sock_mutex);
+ ret = relayd_end_data_pending(&relayd->control_sock,
+ relayd->relayd_session_id, &is_data_inflight);
+ pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
+ if (ret < 0 || !is_data_inflight) {
+ /* On error or if NO data inflight, no data is pending. */
+ goto data_not_pending;
+ }
+ }
+
/*
- * Finding _no_ node in the hash table means that the stream(s) have been
- * removed thus data is guaranteed to be available for analysis from the
- * trace files. This is *only* true for local consumer and not network
- * streaming.
+ * Finding _no_ node in the hash table and no inflight data means that the
+ * stream(s) have been removed thus data is guaranteed to be available for
+ * analysis from the trace files.
*/
+data_not_pending:
/* Data is available to be read by a viewer. */
pthread_mutex_unlock(&consumer_data.lock);
rcu_read_unlock();
return 0;
-data_not_pending:
+data_pending:
/* Data is still being extracted from buffers. */
pthread_mutex_unlock(&consumer_data.lock);
rcu_read_unlock();
projects / lttng-tools.git / blobdiff