#include "session.h"
#include "stream-fd.h"
+#include "tracefile-array.h"
+
+struct relay_stream_chunk_id {
+ bool is_set;
+ uint64_t value;
+};
/*
* Represents a stream in the relay
struct relay_stream {
uint64_t stream_handle;
- /*
- * reflock used to synchronize the closing of this stream.
- * stream reflock nests inside viewer stream reflock.
- * stream reflock nests inside index reflock.
- */
- pthread_mutex_t reflock;
struct urcu_ref ref;
/* Back reference to trace. Protected by refcount on trace object. */
struct ctf_trace *trace;
* inside the ctf_trace lock.
*/
pthread_mutex_t lock;
- uint64_t prev_seq; /* previous data sequence number encountered. */
- uint64_t last_net_seq_num; /* seq num to encounter before closing. */
+ /* previous data sequence number written to disk. */
+ uint64_t prev_data_seq;
+ /* previous index sequence number written to disk. */
+ uint64_t prev_index_seq;
+ /* seq num to encounter before closing. */
+ uint64_t last_net_seq_num;
/* FD on which to write the stream data. */
struct stream_fd *stream_fd;
- /* FD on which to write the index data. */
- struct stream_fd *index_fd;
+ /* index file on which to write the index data. */
+ struct lttng_index_file *index_file;
char *path_name;
+ /*
+ * prev_path_name is only used for session rotation support.
+ * It is essentially used to work around the fact that index
+ * files are always created from the 'data' connection.
+ *
+ * Hence, it is possible to receive a ROTATE_STREAM command
+ * which affects the stream's path_name before the creation of
+ * an index file. In this situation, the index file of the
+ * 'previous' chunk would be created in the new destination folder.
+ *
+ * It would then be unlinked when the actual index of the new chunk
+ * is created.
+ */
+ char *prev_path_name;
char *channel_name;
/* On-disk circular buffer of tracefiles. */
uint64_t tracefile_size;
uint64_t tracefile_size_current;
uint64_t tracefile_count;
- uint64_t current_tracefile_id;
- uint64_t current_tracefile_seq; /* Free-running counter. */
- uint64_t oldest_tracefile_seq; /* Free-running counter. */
+ /*
+ * Position in the tracefile where we have the full index also on disk.
+ */
+ uint64_t pos_after_last_complete_data_index;
- /* 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;
- uint64_t total_index_received;
+ /*
+ * Tracefile array is an index of the stream trace files,
+ * indexed by position. It allows keeping track of the oldest
+ * available indexes when overwriting trace files in tracefile
+ * rotation.
+ */
+ struct tracefile_array *tfa;
- bool closed; /* Stream is closed. */
+ bool closed; /* Stream is closed. */
+ bool close_requested; /* Close command has been received. */
/*
* Counts number of indexes in indexes_ht. Redundant info.
* Node of stream within global stream hash table.
*/
struct lttng_ht_node_u64 node;
+ bool in_stream_ht; /* is stream in stream hash table. */
struct rcu_head rcu_node; /* For call_rcu teardown. */
+ /*
+ * When we have written the data and index corresponding to this
+ * seq_num, rotate the tracefile (session rotation). The path_name is
+ * already up-to-date.
+ * This is set to -1ULL when no rotation is pending.
+ *
+ * Always access with stream lock held.
+ */
+ uint64_t rotate_at_seq_num;
+ /*
+ * When rotate_at_seq_num != -1ULL, meaning that a rotation is ongoing,
+ * data_rotated and index_rotated respectively indicate if the stream's
+ * data and index have been rotated. A rotation is considered completed
+ * when both rotations have occurred.
+ */
+ bool data_rotated;
+ bool index_rotated;
+ /*
+ * This is the id of the chunk where we are writing to if no rotation is
+ * pending (rotate_at_seq_num == -1ULL). If a rotation is pending, this
+ * is the chunk_id we will have after the rotation. It must be updated
+ * atomically with rotate_at_seq_num.
+ *
+ * Always access with stream lock held.
+ *
+ * This attribute is not set if the stream is created by a pre-2.11
+ * consumer.
+ */
+ struct relay_stream_chunk_id current_chunk_id;
};
struct relay_stream *stream_create(struct ctf_trace *trace,
uint64_t stream_handle, char *path_name,
char *channel_name, uint64_t tracefile_size,
- uint64_t tracefile_count);
+ uint64_t tracefile_count, const struct relay_stream_chunk_id *chunk_id);
struct relay_stream *stream_get_by_id(uint64_t stream_id);
bool stream_get(struct relay_stream *stream);
void stream_put(struct relay_stream *stream);
-void stream_close(struct relay_stream *stream);
+void try_stream_close(struct relay_stream *stream);
void stream_publish(struct relay_stream *stream);
void print_relay_streams(void);
projects / lttng-tools.git / blobdiff