goto error_unlock;
}
} else {
- bool reference_acquired;
-
/*
* Transition the viewer session into the newest trace chunk available.
*/
}
}
- reference_acquired = lttng_trace_chunk_get(
- viewer_session->current_trace_chunk);
- 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);
+
+ assert(reference_acquired);
+ viewer_stream_trace_chunk =
+ viewer_session->current_trace_chunk;
+ }
}
viewer_stream = viewer_stream_create(
goto send_reply;
}
+ /*
+ * For any new stream, create it with LTTNG_VIEWER_SEEK_BEGINNING since
+ * that at this point the client is already attached to the session.Aany
+ * initial stream will have been created with the seek type at attach
+ * time (for now most readers use the LTTNG_VIEWER_SEEK_LAST on attach).
+ * Otherwise any event happening in a new stream between the attach and
+ * a call to viewer_get_new_streams will be "lost" (never received) from
+ * the viewer's point of view.
+ */
pthread_mutex_lock(&session->lock);
+ /*
+ * If a session rotation is ongoing, do not attempt to open any
+ * stream, because the chunk can be in an intermediate state
+ * due to directory renaming.
+ */
+ if (session->ongoing_rotation) {
+ DBG("Relay session %" PRIu64 " rotation ongoing", session_id);
+ response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_NO_NEW);
+ goto send_reply_unlock;
+ }
ret = make_viewer_streams(session,
conn->viewer_session,
- LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent,
+ LTTNG_VIEWER_SEEK_BEGINNING, &nb_total, &nb_unsent,
&nb_created, &closed);
if (ret < 0) {
goto error_unlock_session;
goto send_reply;
}
+ /*
+ * If a session rotation is ongoing, do not attempt to open any
+ * stream, because the chunk can be in an intermediate state
+ * due to directory renaming.
+ */
+ if (session->ongoing_rotation) {
+ DBG("Relay session %" PRIu64 " rotation ongoing", session_id);
+ send_streams = 0;
+ goto send_reply;
+ }
+
ret = make_viewer_streams(session,
conn->viewer_session, seek_type,
&nb_streams, NULL, NULL, &closed);
metadata_viewer_stream =
ctf_trace_get_viewer_metadata_stream(ctf_trace);
+ /*
+ * Hold the session lock to protect against concurrent changes
+ * to the chunk files (e.g. rename done by clear), which are
+ * protected by the session ongoing rotation state. Those are
+ * synchronized with the session lock.
+ */
+ pthread_mutex_lock(&rstream->trace->session->lock);
pthread_mutex_lock(&rstream->lock);
/*
* This allows clients to consume all the packets of a trace chunk
* after a session's destruction.
*/
- if (conn->viewer_session->current_trace_chunk != vstream->stream_file.trace_chunk &&
+ if (!lttng_trace_chunk_ids_equal(conn->viewer_session->current_trace_chunk, vstream->stream_file.trace_chunk) &&
!(rstream->completed_rotation_count == vstream->last_seen_rotation_count + 1 && !rstream->trace_chunk)) {
- DBG("Viewer session and viewer stream chunk differ: "
+ DBG("Viewer session and viewer stream chunk IDs differ: "
"vsession chunk %p vstream chunk %p",
conn->viewer_session->current_trace_chunk,
vstream->stream_file.trace_chunk);
send_reply:
if (rstream) {
pthread_mutex_unlock(&rstream->lock);
+ pthread_mutex_unlock(&rstream->trace->session->lock);
}
if (metadata_viewer_stream) {
error_put:
pthread_mutex_unlock(&rstream->lock);
+ pthread_mutex_unlock(&rstream->trace->session->lock);
if (metadata_viewer_stream) {
viewer_stream_put(metadata_viewer_stream);
}
* an error.
*/
if (vstream->metadata_sent > 0) {
- vstream->stream->no_new_metadata_notified = true;
- if (vstream->stream->closed) {
+ if (vstream->stream->closed && vstream->stream->no_new_metadata_notified) {
/* Release ownership for the viewer metadata stream. */
viewer_stream_put(vstream);
}
+ vstream->stream->no_new_metadata_notified = true;
}
goto send_reply;
}
}
}
- if (conn->viewer_session->current_trace_chunk !=
- vstream->stream_file.trace_chunk) {
+ if (conn->viewer_session->current_trace_chunk &&
+ !lttng_trace_chunk_ids_equal(conn->viewer_session->current_trace_chunk,
+ vstream->stream_file.trace_chunk)) {
bool acquired_reference;
DBG("Viewer session and viewer stream chunk differ: "
len = vstream->stream->metadata_received - vstream->metadata_sent;
- /*
- * Either this is the first time the metadata file is read, or a
- * rotation of the corresponding relay stream has occured.
- */
- if (!vstream->stream_file.handle && len > 0) {
+ if (!vstream->stream_file.trace_chunk) {
+ reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA);
+ len = 0;
+ goto send_reply;
+ } else if (vstream->stream_file.trace_chunk &&
+ !vstream->stream_file.handle && len > 0) {
+ /*
+ * Either this is the first time the metadata file is read, or a
+ * rotation of the corresponding relay stream has occurred.
+ */
struct fs_handle *fs_handle;
char file_path[LTTNG_PATH_MAX];
enum lttng_trace_chunk_status status;
projects / lttng-tools.git / blobdiff