#include <inttypes.h>
#include <common/common.hpp>
#include <common/time.hpp>
+#include <vector>
#include "ust-registry.hpp"
#include "ust-clock.hpp"
if (chan->chan_id == -1U)
return 0;
+ /*
+ * We don't want to output an event's metadata before its parent
+ * stream's metadata. If the stream's metadata hasn't been output yet,
+ * skip this event. Its metadata will be output when we output the
+ * stream's metadata.
+ */
+ if (!chan->metadata_dumped || event->metadata_dumped) {
+ return 0;
+ }
+
ret = lttng_metadata_printf(session,
"event {\n"
" name = \"%s\";\n"
/*
* Should be called with session registry mutex held.
+ *
+ * RCU read lock must be held by the caller.
*/
int ust_metadata_channel_statedump(struct ust_registry_session *session,
struct ust_registry_channel *chan)
{
int ret;
+ ASSERT_RCU_READ_LOCKED();
+
/* Don't dump metadata events */
if (chan->chan_id == -1U)
return 0;
/* Flag success of metadata dump. */
chan->metadata_dumped = 1;
+ /*
+ * Output the metadata of any existing event.
+ *
+ * Sort the events by id. This is not necessary, but it's nice to have
+ * a more predictable order in the metadata file.
+ */
+ std::vector<ust_registry_event *> events;
+ {
+ cds_lfht_iter event_iter;
+ ust_registry_event *event;
+ cds_lfht_for_each_entry(chan->events->ht, &event_iter, event,
+ node.node) {
+ events.push_back(event);
+ }
+ }
+
+ std::sort(events.begin(), events.end(),
+ [] (ust_registry_event *a, ust_registry_event *b) {
+ return a->id < b->id;
+ });
+
+ for (ust_registry_event *event : events) {
+ ust_metadata_event_statedump(session, chan, event);
+ }
+
return 0;
}