#include <limits.h>
#include <urcu.h>
#include <urcu/wfqueue.h>
+#include <urcu/list.h>
#include <common/hashtable/hashtable.h>
-#include <common/index/lttng-index.h>
+#include <common/index/ctf-index.h>
#include "ctf-trace.h"
RELAY_VIEWER_NOTIFICATION = 4,
};
+/*
+ * When we receive a stream, it gets stored in a list (on a per connection
+ * basis) until we have all the streams of the same channel and the metadata
+ * associated with it, then it gets flagged with viewer_ready.
+ */
+struct relay_stream_recv_handle {
+ uint64_t id; /* stream handle */
+ struct cds_list_head node;
+};
+
/*
* Represents a session for the relay point of view
*/
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;
uint64_t last_net_seq_num;
+
+ /*
+ * This node is added to the *control* connection hash table and the
+ * pointer is copied in here so we can access it when deleting this object.
+ * When deleting this, the ctf trace ht MUST NOT be destroyed. This happens
+ * at connection deletion.
+ */
struct lttng_ht_node_str ctf_trace_node;
+ struct lttng_ht *ctf_traces_ht;
/*
* To protect from concurrent read/update between the
* 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;
+ /*
+ * Can this stream be used by a viewer or are we waiting for additional
+ * information.
+ */
+ unsigned int viewer_ready: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;
+ /* Stop after reading this tracefile. */
+ uint64_t tracefile_count_last;
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;
};
/*
struct lttng_ht_node_ulong sock_n;
struct rcu_head rcu_node;
enum connection_type type;
- unsigned int version_check_done:1;
/* protocol version to use for this session */
uint32_t major;
uint32_t minor;
struct lttng_ht *ctf_traces_ht; /* indexed by path name */
+ uint64_t session_id;
+ struct cds_list_head recv_head;
+ unsigned int version_check_done:1;
};
struct relay_local_data {
extern struct lttng_ht *viewer_streams_ht;
extern struct lttng_ht *indexes_ht;
+extern const char *tracing_group_name;
+
+extern const char * const config_section_name;
+
struct relay_stream *relay_stream_find_by_id(uint64_t stream_id);
+void lttng_relay_notify_ready(void);
#endif /* LTTNG_RELAYD_H */