- uint64_t current_tracefile_seq; /* Free-running counter. */
- uint64_t oldest_tracefile_seq; /* Free-running counter. */
-
- /* To inform the viewer up to where it can go back in time. */
- uint64_t oldest_tracefile_id;
+ /*
+ * Counts the number of received indexes. The "tag" associated
+ * with an index is taken before incrementing this seqcount.
+ * Therefore, the sequence tag associated with the last index
+ * received is always index_received_seqcount - 1.
+ */
+ uint64_t index_received_seqcount;