+++ /dev/null
-#ifndef _STREAM_H
-#define _STREAM_H
-
-/*
- * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
- * David Goulet <dgoulet@efficios.com>
- * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License, version 2 only, as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include <limits.h>
-#include <inttypes.h>
-#include <pthread.h>
-#include <urcu/list.h>
-
-#include <common/hashtable/hashtable.h>
-#include <common/trace-chunk.h>
-
-#include "session.h"
-#include "stream-fd.h"
-#include "tracefile-array.h"
-
-/*
- * Represents a stream in the relay
- */
-struct relay_stream {
- uint64_t stream_handle;
-
- struct urcu_ref ref;
- /* Back reference to trace. Protected by refcount on trace object. */
- struct ctf_trace *trace;
-
- /*
- * To protect from concurrent read/update. The viewer stream
- * lock nests inside the stream lock. The stream lock nests
- * inside the ctf_trace lock.
- */
- pthread_mutex_t lock;
- /* 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;
- /* 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;
-
- /*
- * Position in the tracefile where we have the full index also on disk.
- */
- uint64_t pos_after_last_complete_data_index;
-
- /*
- * 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;
-
- /*
- * 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 close_requested; /* Close command has been received. */
-
- /*
- * Counts number of indexes in indexes_ht. Redundant info.
- * Protected by stream lock.
- */
- int indexes_in_flight;
- struct lttng_ht *indexes_ht;
-
- /*
- * If the stream is inactive, this field is updated with the
- * live beacon timestamp end, when it is active, this
- * field == -1ULL.
- */
- uint64_t beacon_ts_end;
-
- /* CTF stream ID, -1ULL when unset (first packet not received yet). */
- uint64_t ctf_stream_id;
-
- /* Indicate if the stream was initialized for a data pending command. */
- bool data_pending_check_done;
-
- /* Is this stream a metadata stream ? */
- int32_t is_metadata;
- /* Amount of metadata received (bytes). */
- uint64_t metadata_received;
-
- /*
- * Member of the stream list in struct ctf_trace.
- * Updates are protected by the stream_list_lock.
- * Traversals are protected by RCU.
- */
- struct cds_list_head stream_node;
- /*
- * Temporary list belonging to the connection until all streams
- * are received for that connection.
- * Member of the stream recv list in the connection.
- * Updates are protected by the stream_recv_list_lock.
- * Traversals are protected by RCU.
- */
- bool in_recv_list;
- struct cds_list_head recv_node;
- bool published; /* Protected by session lock. */
- /*
- * 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;
- /*
- * `trace_chunk` is the trace chunk to which the file currently
- * being produced (if any) belongs.
- */
- struct lttng_trace_chunk *trace_chunk;
-};
-
-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);
-
-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 try_stream_close(struct relay_stream *stream);
-void stream_publish(struct relay_stream *stream);
-void print_relay_streams(void);
-
-#endif /* _STREAM_H */
projects / lttng-tools.git / blobdiff