uint64_t tracefile_size_current;
uint64_t tracefile_count;
uint64_t tracefile_count_current;
+ /* To inform the viewer up to where it can go back in time. */
+ uint64_t oldest_tracefile_id;
uint64_t total_index_received;
struct relay_viewer_stream *viewer_stream;
* timestamp end, when it is active, this field == -1ULL.
*/
uint64_t beacon_ts_end;
+ /*
+ * To protect the update of the close_write_flag and the checks of
+ * the tracefile_count_current.
+ * It is taken before checking whenever we need to know if the
+ * writer and reader are working in the same tracefile.
+ */
+ pthread_mutex_t viewer_stream_rotation_lock;
/* Information telling us when to close the stream */
unsigned int close_flag:1;
/* Indicate if the stream was initialized for a data pending command. */
unsigned int data_pending_check_done:1;
unsigned int metadata_flag:1;
+ /*
+ * To detect when we start overwriting old data, it is used to
+ * update the oldest_tracefile_id.
+ */
+ unsigned int tracefile_overwrite:1;
};
/*
char *channel_name;
uint64_t last_sent_index;
uint64_t total_index_received;
- uint64_t tracefile_size;
- uint64_t tracefile_size_current;
uint64_t tracefile_count;
uint64_t tracefile_count_current;
struct lttng_ht_node_u64 stream_n;
struct rcu_head rcu_node;
struct ctf_trace *ctf_trace;
+ /*
+ * This lock blocks only when the writer is about to start overwriting
+ * a file currently read by the reader.
+ *
+ * This is nested INSIDE the viewer_stream_rotation_lock.
+ */
+ pthread_mutex_t overwrite_lock;
/* Information telling us if the stream is a metadata stream. */
unsigned int metadata_flag:1;
+ /*
+ * Information telling us that the stream is closed in write, so
+ * we don't expect new indexes and we can read up to EOF.
+ */
+ unsigned int close_write_flag:1;
+ /*
+ * If the streaming side closes a FD in use in the viewer side,
+ * it sets this flag to inform that it is a normal error.
+ */
+ unsigned int abort_flag:1;
};
/*