#include <common/sessiond-comm/inet.hpp>
#include <common/sessiond-comm/relayd.hpp>
#include <common/sessiond-comm/sessiond-comm.hpp>
+#include <common/urcu.hpp>
#include <common/uri.hpp>
#include <common/utils.hpp>
static int check_new_streams(struct relay_connection *conn)
{
struct relay_session *session;
- unsigned long current_val;
int ret = 0;
if (!conn->viewer_session) {
goto end;
}
- rcu_read_lock();
- cds_list_for_each_entry_rcu(
- session, &conn->viewer_session->session_list, viewer_session_node)
+
{
- if (!session_get(session)) {
- continue;
- }
- current_val = uatomic_cmpxchg(&session->new_streams, 1, 0);
- ret = current_val;
- session_put(session);
- if (ret == 1) {
- goto end;
+ lttng::urcu::read_lock_guard read_lock;
+ cds_list_for_each_entry_rcu(
+ session, &conn->viewer_session->session_list, viewer_session_node)
+ {
+ if (!session_get(session)) {
+ continue;
+ }
+
+ ret = uatomic_read(&session->new_streams);
+ session_put(session);
+ if (ret == 1) {
+ goto end;
+ }
}
}
+
end:
- rcu_read_unlock();
+ DBG("Viewer connection has%s new streams: socket_fd = %d",
+ ret == 0 ? " no" : "",
+ conn->sock->fd);
return ret;
}
struct lttng_ht_iter iter;
struct relay_viewer_stream *vstream;
- rcu_read_lock();
+ {
+ lttng::urcu::read_lock_guard read_lock;
- cds_lfht_for_each_entry (viewer_streams_ht->ht, &iter.iter, vstream, stream_n.node) {
- struct ctf_trace *ctf_trace;
- struct lttng_viewer_stream send_stream = {};
+ cds_lfht_for_each_entry (
+ viewer_streams_ht->ht, &iter.iter, vstream, stream_n.node) {
+ struct ctf_trace *ctf_trace;
+ struct lttng_viewer_stream send_stream = {};
- health_code_update();
+ health_code_update();
- if (!viewer_stream_get(vstream)) {
- continue;
- }
+ if (!viewer_stream_get(vstream)) {
+ continue;
+ }
- pthread_mutex_lock(&vstream->stream->lock);
- /* Ignore if not the same session. */
- if (vstream->stream->trace->session->id != session_id ||
- (!ignore_sent_flag && vstream->sent_flag)) {
- pthread_mutex_unlock(&vstream->stream->lock);
- viewer_stream_put(vstream);
- continue;
- }
+ pthread_mutex_lock(&vstream->stream->lock);
+ /* Ignore if not the same session. */
+ if (vstream->stream->trace->session->id != session_id ||
+ (!ignore_sent_flag && vstream->sent_flag)) {
+ pthread_mutex_unlock(&vstream->stream->lock);
+ viewer_stream_put(vstream);
+ continue;
+ }
- ctf_trace = vstream->stream->trace;
- send_stream.id = htobe64(vstream->stream->stream_handle);
- send_stream.ctf_trace_id = htobe64(ctf_trace->id);
- send_stream.metadata_flag = htobe32(vstream->stream->is_metadata);
- if (lttng_strncpy(send_stream.path_name,
- vstream->path_name,
- sizeof(send_stream.path_name))) {
- pthread_mutex_unlock(&vstream->stream->lock);
- viewer_stream_put(vstream);
- ret = -1; /* Error. */
- goto end_unlock;
- }
- if (lttng_strncpy(send_stream.channel_name,
- vstream->channel_name,
- sizeof(send_stream.channel_name))) {
- pthread_mutex_unlock(&vstream->stream->lock);
- viewer_stream_put(vstream);
- ret = -1; /* Error. */
- goto end_unlock;
- }
+ ctf_trace = vstream->stream->trace;
+ send_stream.id = htobe64(vstream->stream->stream_handle);
+ send_stream.ctf_trace_id = htobe64(ctf_trace->id);
+ send_stream.metadata_flag = htobe32(vstream->stream->is_metadata);
+ if (lttng_strncpy(send_stream.path_name,
+ vstream->path_name,
+ sizeof(send_stream.path_name))) {
+ pthread_mutex_unlock(&vstream->stream->lock);
+ viewer_stream_put(vstream);
+ ret = -1; /* Error. */
+ goto end;
+ }
+ if (lttng_strncpy(send_stream.channel_name,
+ vstream->channel_name,
+ sizeof(send_stream.channel_name))) {
+ pthread_mutex_unlock(&vstream->stream->lock);
+ viewer_stream_put(vstream);
+ ret = -1; /* Error. */
+ goto end;
+ }
- DBG("Sending stream %" PRIu64 " to viewer", vstream->stream->stream_handle);
- vstream->sent_flag = true;
- pthread_mutex_unlock(&vstream->stream->lock);
+ DBG("Sending stream %" PRIu64 " to viewer", vstream->stream->stream_handle);
+ vstream->sent_flag = true;
+ pthread_mutex_unlock(&vstream->stream->lock);
- ret = send_response(sock, &send_stream, sizeof(send_stream));
- viewer_stream_put(vstream);
- if (ret < 0) {
- goto end_unlock;
+ ret = send_response(sock, &send_stream, sizeof(send_stream));
+ viewer_stream_put(vstream);
+ if (ret < 0) {
+ goto end;
+ }
}
}
ret = 0;
-end_unlock:
- rcu_read_unlock();
+end:
return ret;
}
* Create viewer streams for relay streams that are ready to be
* used for a the given session id only.
*/
- rcu_read_lock();
- cds_lfht_for_each_entry (
- relay_session->ctf_traces_ht->ht, &iter.iter, ctf_trace, node.node) {
- bool trace_has_metadata_stream = false;
-
- health_code_update();
-
- if (!ctf_trace_get(ctf_trace)) {
- continue;
- }
+ {
+ lttng::urcu::read_lock_guard read_lock;
- /*
- * Iterate over all the streams of the trace to see if we have a
- * metadata stream.
- */
- cds_list_for_each_entry_rcu(relay_stream, &ctf_trace->stream_list, stream_node)
- {
- bool is_metadata_stream;
+ cds_lfht_for_each_entry (
+ relay_session->ctf_traces_ht->ht, &iter.iter, ctf_trace, node.node) {
+ bool trace_has_metadata_stream = false;
- pthread_mutex_lock(&relay_stream->lock);
- is_metadata_stream = relay_stream->is_metadata;
- pthread_mutex_unlock(&relay_stream->lock);
+ health_code_update();
- if (is_metadata_stream) {
- trace_has_metadata_stream = true;
- break;
+ if (!ctf_trace_get(ctf_trace)) {
+ continue;
}
- }
-
- relay_stream = nullptr;
-
- /*
- * If there is no metadata stream in this trace at the moment
- * and we never sent one to the viewer, skip the trace. We
- * accept that the viewer will not see this trace at all.
- */
- if (!trace_has_metadata_stream && !ctf_trace->metadata_stream_sent_to_viewer) {
- ctf_trace_put(ctf_trace);
- continue;
- }
-
- cds_list_for_each_entry_rcu(relay_stream, &ctf_trace->stream_list, stream_node)
- {
- struct relay_viewer_stream *viewer_stream;
- if (!stream_get(relay_stream)) {
- continue;
+ /*
+ * Iterate over all the streams of the trace to see if we have a
+ * metadata stream.
+ */
+ cds_list_for_each_entry_rcu(
+ relay_stream, &ctf_trace->stream_list, stream_node)
+ {
+ bool is_metadata_stream;
+
+ pthread_mutex_lock(&relay_stream->lock);
+ is_metadata_stream = relay_stream->is_metadata;
+ pthread_mutex_unlock(&relay_stream->lock);
+
+ if (is_metadata_stream) {
+ trace_has_metadata_stream = true;
+ break;
+ }
}
- pthread_mutex_lock(&relay_stream->lock);
+ relay_stream = nullptr;
+
/*
- * stream published is protected by the session lock.
+ * If there is no metadata stream in this trace at the moment
+ * and we never sent one to the viewer, skip the trace. We
+ * accept that the viewer will not see this trace at all.
*/
- if (!relay_stream->published) {
- goto next;
+ if (!trace_has_metadata_stream &&
+ !ctf_trace->metadata_stream_sent_to_viewer) {
+ ctf_trace_put(ctf_trace);
+ continue;
}
- viewer_stream = viewer_stream_get_by_id(relay_stream->stream_handle);
- if (!viewer_stream) {
- struct lttng_trace_chunk *viewer_stream_trace_chunk = nullptr;
- /*
- * Save that we sent the metadata stream to the
- * viewer. So that we know what trace the viewer
- * is aware of.
- */
- if (relay_stream->is_metadata) {
- ctf_trace->metadata_stream_sent_to_viewer = true;
+ cds_list_for_each_entry_rcu(
+ relay_stream, &ctf_trace->stream_list, stream_node)
+ {
+ struct relay_viewer_stream *viewer_stream;
+
+ if (!stream_get(relay_stream)) {
+ continue;
}
+ pthread_mutex_lock(&relay_stream->lock);
/*
- * If a rotation is ongoing, use a copy of the
- * relay stream's chunk to ensure the stream
- * files exist.
- *
- * Otherwise, the viewer session's current trace
- * chunk can be used safely.
+ * stream published is protected by the session lock.
*/
- if ((relay_stream->ongoing_rotation.is_set ||
- session_has_ongoing_rotation(relay_session)) &&
- relay_stream->trace_chunk) {
- viewer_stream_trace_chunk =
- lttng_trace_chunk_copy(relay_stream->trace_chunk);
- if (!viewer_stream_trace_chunk) {
- ret = -1;
- ctf_trace_put(ctf_trace);
- goto error_unlock;
+ if (!relay_stream->published) {
+ goto next;
+ }
+ viewer_stream =
+ viewer_stream_get_by_id(relay_stream->stream_handle);
+ if (!viewer_stream) {
+ struct lttng_trace_chunk *viewer_stream_trace_chunk =
+ nullptr;
+
+ /*
+ * Save that we sent the metadata stream to the
+ * viewer. So that we know what trace the viewer
+ * is aware of.
+ */
+ if (relay_stream->is_metadata) {
+ ctf_trace->metadata_stream_sent_to_viewer = true;
}
- } else {
+
/*
- * Transition the viewer session into the newest trace chunk
- * available.
+ * If a rotation is ongoing, use a copy of the
+ * relay stream's chunk to ensure the stream
+ * files exist.
+ *
+ * Otherwise, the viewer session's current trace
+ * chunk can be used safely.
*/
- if (!lttng_trace_chunk_ids_equal(
- viewer_session->current_trace_chunk,
- relay_stream->trace_chunk)) {
- ret = viewer_session_set_trace_chunk_copy(
- viewer_session, relay_stream->trace_chunk);
- if (ret) {
+ if ((relay_stream->ongoing_rotation.is_set ||
+ session_has_ongoing_rotation(relay_session)) &&
+ relay_stream->trace_chunk) {
+ viewer_stream_trace_chunk = lttng_trace_chunk_copy(
+ relay_stream->trace_chunk);
+ if (!viewer_stream_trace_chunk) {
ret = -1;
ctf_trace_put(ctf_trace);
goto error_unlock;
}
- }
-
- if (relay_stream->trace_chunk) {
+ } else {
/*
- * If the corresponding relay
- * stream's trace chunk is set,
- * the viewer stream will be
- * created under it.
- *
- * Note that a relay stream can
- * have a NULL output trace
- * chunk (for instance, after a
- * clear against a stopped
- * session).
+ * Transition the viewer session into the newest
+ * trace chunk available.
*/
- const bool reference_acquired =
- lttng_trace_chunk_get(
- viewer_session->current_trace_chunk);
+ if (!lttng_trace_chunk_ids_equal(
+ viewer_session->current_trace_chunk,
+ relay_stream->trace_chunk)) {
+ ret = viewer_session_set_trace_chunk_copy(
+ viewer_session,
+ relay_stream->trace_chunk);
+ if (ret) {
+ ret = -1;
+ ctf_trace_put(ctf_trace);
+ goto error_unlock;
+ }
+ }
- LTTNG_ASSERT(reference_acquired);
- viewer_stream_trace_chunk =
- viewer_session->current_trace_chunk;
+ if (relay_stream->trace_chunk) {
+ /*
+ * If the corresponding relay
+ * stream's trace chunk is set,
+ * the viewer stream will be
+ * created under it.
+ *
+ * Note that a relay stream can
+ * have a NULL output trace
+ * chunk (for instance, after a
+ * clear against a stopped
+ * session).
+ */
+ const bool reference_acquired =
+ lttng_trace_chunk_get(
+ viewer_session
+ ->current_trace_chunk);
+
+ LTTNG_ASSERT(reference_acquired);
+ viewer_stream_trace_chunk =
+ viewer_session->current_trace_chunk;
+ }
}
- }
- viewer_stream = viewer_stream_create(
- relay_stream, viewer_stream_trace_chunk, seek_t);
- lttng_trace_chunk_put(viewer_stream_trace_chunk);
- viewer_stream_trace_chunk = nullptr;
- if (!viewer_stream) {
- ret = -1;
- ctf_trace_put(ctf_trace);
- goto error_unlock;
- }
+ viewer_stream = viewer_stream_create(
+ relay_stream, viewer_stream_trace_chunk, seek_t);
+ lttng_trace_chunk_put(viewer_stream_trace_chunk);
+ viewer_stream_trace_chunk = nullptr;
+ if (!viewer_stream) {
+ ret = -1;
+ ctf_trace_put(ctf_trace);
+ goto error_unlock;
+ }
- if (nb_created) {
- /* Update number of created stream counter. */
- (*nb_created)++;
- }
- /*
- * Ensure a self-reference is preserved even
- * after we have put our local reference.
- */
- if (!viewer_stream_get(viewer_stream)) {
- ERR("Unable to get self-reference on viewer stream, logic error.");
- abort();
- }
- } else {
- if (!viewer_stream->sent_flag && nb_unsent) {
- /* Update number of unsent stream counter. */
- (*nb_unsent)++;
- }
- }
- /* Update number of total stream counter. */
- if (nb_total) {
- if (relay_stream->is_metadata) {
- if (!relay_stream->closed ||
- relay_stream->metadata_received >
- viewer_stream->metadata_sent) {
- (*nb_total)++;
+ if (nb_created) {
+ /* Update number of created stream counter. */
+ (*nb_created)++;
+ }
+ /*
+ * Ensure a self-reference is preserved even
+ * after we have put our local reference.
+ */
+ if (!viewer_stream_get(viewer_stream)) {
+ ERR("Unable to get self-reference on viewer stream, logic error.");
+ abort();
}
} else {
- if (!relay_stream->closed ||
- !(((int64_t) (relay_stream->prev_data_seq -
- relay_stream->last_net_seq_num)) >= 0)) {
- (*nb_total)++;
+ if (!viewer_stream->sent_flag && nb_unsent) {
+ /* Update number of unsent stream counter. */
+ (*nb_unsent)++;
+ }
+ }
+ /* Update number of total stream counter. */
+ if (nb_total) {
+ if (relay_stream->is_metadata) {
+ if (!relay_stream->closed ||
+ relay_stream->metadata_received >
+ viewer_stream->metadata_sent) {
+ (*nb_total)++;
+ }
+ } else {
+ if (!relay_stream->closed ||
+ !(((int64_t) (relay_stream->prev_data_seq -
+ relay_stream->last_net_seq_num)) >=
+ 0)) {
+ (*nb_total)++;
+ }
}
}
+ /* Put local reference. */
+ viewer_stream_put(viewer_stream);
+ next:
+ pthread_mutex_unlock(&relay_stream->lock);
+ stream_put(relay_stream);
}
- /* Put local reference. */
- viewer_stream_put(viewer_stream);
- next:
- pthread_mutex_unlock(&relay_stream->lock);
- stream_put(relay_stream);
+ relay_stream = nullptr;
+ ctf_trace_put(ctf_trace);
}
- relay_stream = nullptr;
- ctf_trace_put(ctf_trace);
}
ret = 0;
error_unlock:
- rcu_read_unlock();
if (relay_stream) {
pthread_mutex_unlock(&relay_stream->lock);
* the data will be read at some point in time
* or wait to the end of the world :)
*/
- ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn));
+ ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); /* NOLINT sizeof
+ used on a
+ pointer. */
if (ret < 0) {
PERROR("write conn pipe");
connection_put(conn);
return -1;
}
- rcu_read_lock();
- cds_lfht_for_each_entry (sessions_ht->ht, &iter.iter, session, session_n.node) {
- struct lttng_viewer_session *send_session;
+ {
+ lttng::urcu::read_lock_guard read_lock;
- health_code_update();
+ cds_lfht_for_each_entry (sessions_ht->ht, &iter.iter, session, session_n.node) {
+ struct lttng_viewer_session *send_session;
- pthread_mutex_lock(&session->lock);
- if (session->connection_closed) {
- /* Skip closed session */
- goto next_session;
- }
+ health_code_update();
+
+ pthread_mutex_lock(&session->lock);
+ if (session->connection_closed) {
+ /* Skip closed session */
+ goto next_session;
+ }
- if (count >= buf_count) {
- struct lttng_viewer_session *newbuf;
- uint32_t new_buf_count = buf_count << 1;
+ if (count >= buf_count) {
+ struct lttng_viewer_session *newbuf;
+ uint32_t new_buf_count = buf_count << 1;
- newbuf = (lttng_viewer_session *) realloc(
- send_session_buf, new_buf_count * sizeof(*send_session_buf));
- if (!newbuf) {
+ newbuf = (lttng_viewer_session *) realloc(
+ send_session_buf,
+ new_buf_count * sizeof(*send_session_buf));
+ if (!newbuf) {
+ ret = -1;
+ goto break_loop;
+ }
+ send_session_buf = newbuf;
+ buf_count = new_buf_count;
+ }
+ send_session = &send_session_buf[count];
+ if (lttng_strncpy(send_session->session_name,
+ session->session_name,
+ sizeof(send_session->session_name))) {
ret = -1;
goto break_loop;
}
- send_session_buf = newbuf;
- buf_count = new_buf_count;
- }
- send_session = &send_session_buf[count];
- if (lttng_strncpy(send_session->session_name,
- session->session_name,
- sizeof(send_session->session_name))) {
- ret = -1;
- goto break_loop;
- }
- if (lttng_strncpy(send_session->hostname,
- session->hostname,
- sizeof(send_session->hostname))) {
- ret = -1;
- goto break_loop;
- }
- send_session->id = htobe64(session->id);
- send_session->live_timer = htobe32(session->live_timer);
- if (session->viewer_attached) {
- send_session->clients = htobe32(1);
- } else {
- send_session->clients = htobe32(0);
+ if (lttng_strncpy(send_session->hostname,
+ session->hostname,
+ sizeof(send_session->hostname))) {
+ ret = -1;
+ goto break_loop;
+ }
+ send_session->id = htobe64(session->id);
+ send_session->live_timer = htobe32(session->live_timer);
+ if (session->viewer_attached) {
+ send_session->clients = htobe32(1);
+ } else {
+ send_session->clients = htobe32(0);
+ }
+ send_session->streams = htobe32(session->stream_count);
+ count++;
+ next_session:
+ pthread_mutex_unlock(&session->lock);
+ continue;
+ break_loop:
+ pthread_mutex_unlock(&session->lock);
+ break;
}
- send_session->streams = htobe32(session->stream_count);
- count++;
- next_session:
- pthread_mutex_unlock(&session->lock);
- continue;
- break_loop:
- pthread_mutex_unlock(&session->lock);
- break;
}
- rcu_read_unlock();
+
if (ret < 0) {
goto end_free;
}
response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
goto send_reply_unlock;
}
+
+ uatomic_set(&session->new_streams, 0);
send_streams = 1;
response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK);
bool viewer_stream_and_session_in_same_chunk, viewer_stream_one_rotation_behind;
uint64_t stream_file_chunk_id = -1ULL, viewer_session_chunk_id = -1ULL;
enum lttng_trace_chunk_status status;
+ bool attached_sessions_have_new_streams = false;
LTTNG_ASSERT(conn);
goto send_reply;
}
+ ret = check_new_streams(conn);
+ if (ret < 0) {
+ viewer_index.status = LTTNG_VIEWER_INDEX_ERR;
+ ERR("Error checking for new streams in the attached sessions, returning status=%s",
+ lttng_viewer_next_index_return_code_str(
+ (enum lttng_viewer_next_index_return_code) viewer_index.status));
+ goto send_reply;
+ } else if (ret == 1) {
+ attached_sessions_have_new_streams = true;
+ }
+
if (rstream->ongoing_rotation.is_set) {
/* Rotation is ongoing, try again later. */
viewer_index.status = LTTNG_VIEWER_INDEX_RETRY;
*/
goto send_reply;
}
+
/* At this point, ret is 0 thus we will be able to read the index. */
LTTNG_ASSERT(!ret);
vstream->stream_file.handle = fs_handle;
}
- ret = check_new_streams(conn);
- if (ret < 0) {
- viewer_index.status = LTTNG_VIEWER_INDEX_ERR;
- ERR("Error checking for new streams before sending new index to stream id %" PRIu64
- ", returning status=%s",
- (uint64_t) be64toh(request_index.stream_id),
- lttng_viewer_next_index_return_code_str(
- (enum lttng_viewer_next_index_return_code) viewer_index.status));
- goto send_reply;
- } else if (ret == 1) {
- viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
- }
-
ret = lttng_index_file_read(vstream->index_file, &packet_index);
if (ret) {
viewer_index.status = LTTNG_VIEWER_INDEX_ERR;
pthread_mutex_unlock(&metadata_viewer_stream->stream->lock);
}
+ if (attached_sessions_have_new_streams) {
+ viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
+ }
+
viewer_index.flags = htobe32(viewer_index.flags);
viewer_index.status = htobe32(viewer_index.status);
health_code_update();
struct lttng_viewer_get_metadata request;
struct lttng_viewer_metadata_packet reply;
struct relay_viewer_stream *vstream = nullptr;
+ bool dispose_of_stream = false;
LTTNG_ASSERT(conn);
reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
goto send_reply;
}
+
+ pthread_mutex_lock(&vstream->stream->trace->session->lock);
+ pthread_mutex_lock(&vstream->stream->trace->lock);
pthread_mutex_lock(&vstream->stream->lock);
if (!vstream->stream->is_metadata) {
ERR("Invalid metadata stream");
if (vstream->metadata_sent >= vstream->stream->metadata_received) {
/*
- * The live viewers expect to receive a NO_NEW_METADATA
- * status before a stream disappears, otherwise they abort the
- * entire live connection when receiving an error status.
- *
- * Clear feature resets the metadata_sent to 0 until the
+ * Clear feature resets the metadata_received to 0 until the
* same metadata is received again.
*/
reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA);
* The live viewer considers a closed 0 byte metadata stream as
* an error.
*/
- if (vstream->metadata_sent > 0) {
- if (vstream->stream->closed && vstream->stream->no_new_metadata_notified) {
- /*
- * Release ownership for the viewer metadata
- * stream. Note that this reference is the
- * viewer's reference. The vstream still exists
- * until the end of the function as
- * viewer_stream_get_by_id() took a reference.
- */
- viewer_stream_put(vstream);
- }
-
- vstream->stream->no_new_metadata_notified = true;
- }
+ dispose_of_stream = vstream->metadata_sent > 0 && vstream->stream->closed;
goto send_reply;
}
len = vstream->stream->metadata_received - vstream->metadata_sent;
if (!vstream->stream_file.trace_chunk) {
+ if (vstream->stream->trace->session->connection_closed) {
+ /*
+ * If the connection is closed, there is no way for the metadata stream
+ * to ever transition back to an active chunk. As such, signal to the viewer
+ * that there is no new metadata available.
+ *
+ * The stream can be disposed-of. On the next execution of this command,
+ * the relay daemon will reply with an error status since the stream can't
+ * be found.
+ */
+ dispose_of_stream = true;
+ }
+
reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA);
len = 0;
goto send_reply;
health_code_update();
if (vstream) {
pthread_mutex_unlock(&vstream->stream->lock);
+ pthread_mutex_unlock(&vstream->stream->trace->lock);
+ pthread_mutex_unlock(&vstream->stream->trace->session->lock);
}
ret = send_response(conn->sock, &reply, sizeof(reply));
if (ret < 0) {
end:
if (vstream) {
viewer_stream_put(vstream);
+ if (dispose_of_stream) {
+ /*
+ * Trigger the destruction of the viewer stream
+ * by releasing its global reference.
+ *
+ * The live viewers expect to receive a NO_NEW_METADATA
+ * status before a stream disappears, otherwise they abort the
+ * entire live connection when receiving an error status.
+ *
+ * On the next query for this stream, an error will be reported to the
+ * client.
+ */
+ viewer_stream_put(vstream);
+ }
}
+
return ret;
}
if (revents & LPOLLIN) {
struct relay_connection *conn;
- ret = lttng_read(live_conn_pipe[0], &conn, sizeof(conn));
+ ret = lttng_read(live_conn_pipe[0],
+ &conn,
+ sizeof(conn)); /* NOLINT sizeof used on a
+ pointer. */
if (ret < 0) {
goto error;
}
(void) fd_tracker_util_poll_clean(the_fd_tracker, &events);
/* Cleanup remaining connection object. */
- rcu_read_lock();
- cds_lfht_for_each_entry (viewer_connections_ht->ht, &iter.iter, destroy_conn, sock_n.node) {
- health_code_update();
- connection_put(destroy_conn);
+ {
+ lttng::urcu::read_lock_guard read_lock;
+
+ cds_lfht_for_each_entry (
+ viewer_connections_ht->ht, &iter.iter, destroy_conn, sock_n.node) {
+ health_code_update();
+ connection_put(destroy_conn);
+ }
}
- rcu_read_unlock();
error_poll_create:
lttng_ht_destroy(viewer_connections_ht);
viewer_connections_ht_error:
projects / lttng-tools.git / blobdiff