unsigned int metadata_flag;
/* Used when the stream is set for network streaming */
uint64_t relayd_stream_id;
- /* Next sequence number to use for trace packet */
+ /*
+ * When sending a stream packet to a relayd, this number is used to track
+ * the packet sent by the consumer and seen by the relayd. When sending the
+ * data header to the relayd, this number is sent and if the transmission
+ * was successful, it is incremented.
+ *
+ * Even if the full data is not fully transmitted it won't matter since
+ * only two possible error can happen after that where either the relayd
+ * died or a read error is detected on the stream making this value useless
+ * after that.
+ *
+ * This value SHOULD be read/updated atomically or with the lock acquired.
+ */
uint64_t next_net_seq_num;
/*
- * Lock to use the stream FDs since they are used between threads. Using
- * this lock with network streaming, when using the control mutex of a
- * consumer_relayd_sock_pair, make sure to acquire this lock BEFORE locking
- * it and releasing it AFTER the control mutex unlock.
+ * Lock to use the stream FDs since they are used between threads.
+ *
+ * This is nested INSIDE the consumer_data lock.
+ * This is nested OUTSIDE consumer_relayd_sock_pair lock.
*/
pthread_mutex_t lock;
/* Tracing session id */
* between threads sending data to the relayd. Since metadata data is sent
* over that socket, at least two sendmsg() are needed (header + data)
* creating a race for packets to overlap between threads using it.
+ *
+ * This is nested INSIDE the consumer_data lock.
+ * This is nested INSIDE the stream lock.
*/
pthread_mutex_t ctrl_sock_mutex;
*/
struct lttcomm_sock data_sock;
struct lttng_ht_node_ulong node;
+
+ /* Session id on both sides for the sockets. */
+ uint64_t relayd_session_id;
+ uint64_t sessiond_session_id;
};
/*
* and number of element in the hash table. It's also a protection for
* concurrent read/write between threads.
*
- * XXX: We need to see if this lock is still needed with the lockless RCU
- * hash tables.
+ * This is nested OUTSIDE the stream lock.
+ * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
*/
pthread_mutex_t lock;
int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream);
int consumer_add_relayd_socket(int net_seq_idx, int sock_type,
struct lttng_consumer_local_data *ctx, int sock,
- struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock);
+ struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock,
+ unsigned int sessiond_id);
void consumer_flag_relayd_for_destroy(
struct consumer_relayd_sock_pair *relayd);
int consumer_data_pending(uint64_t id);
+int consumer_send_status_msg(int sock, int ret_code);
#endif /* LIB_CONSUMER_H */