a448b19cefa0cbc923aeea3e8e94630fed11c1d6
[lttng-tools.git] / src / bin / lttng-relayd / ctf-trace.h
1 #ifndef _CTF_TRACE_H
2 #define _CTF_TRACE_H
3
4 /*
5 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
6 * David Goulet <dgoulet@efficios.com>
7 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License, version 2 only, as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc., 51
20 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23 #include <inttypes.h>
24 #include <urcu/ref.h>
25
26 #include <common/hashtable/hashtable.h>
27
28 #include "session.h"
29 #include "stream.h"
30 #include "viewer-stream.h"
31
32 struct ctf_trace {
33 struct urcu_ref ref; /* Every stream has a ref on the trace. */
34 struct relay_session *session; /* Back ref to trace session */
35
36 /* Trace sub-folder relative to the session output path. */
37 char *path;
38
39 /*
40 * The ctf_trace lock nests inside the session lock.
41 */
42 pthread_mutex_t lock;
43 uint64_t id;
44 struct relay_viewer_stream *viewer_metadata_stream; /* RCU protected */
45
46 /*
47 * Relay streams associated with this ctf trace.
48 * Updates are protected by the stream_list lock.
49 * Traversals are protected by RCU.
50 */
51 struct cds_list_head stream_list;
52 pthread_mutex_t stream_list_lock;
53
54 /*
55 * Node within session trace hash table. Node is indexed by
56 * stream path name.
57 */
58 struct lttng_ht_node_str node;
59 struct rcu_head rcu_node; /* For call_rcu teardown. */
60
61 /*
62 * True if the metadata stream of this trace was sent the viewer in the
63 * past.
64 */
65 bool metadata_stream_sent_to_viewer;
66 };
67
68 struct ctf_trace *ctf_trace_get_by_path_or_create(struct relay_session *session,
69 const char *subpath);
70 bool ctf_trace_get(struct ctf_trace *trace);
71 void ctf_trace_put(struct ctf_trace *trace);
72
73 int ctf_trace_close(struct ctf_trace *trace);
74
75 struct relay_viewer_stream *ctf_trace_get_viewer_metadata_stream(struct ctf_trace *trace);
76
77 #endif /* _CTF_TRACE_H */
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