Clean code base from redundant verification
[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 /*
37 * The ctf_trace lock nests inside the session lock.
38 */
39 pthread_mutex_t lock;
40 uint64_t id;
41 struct relay_viewer_stream *viewer_metadata_stream; /* RCU protected */
42
43 /*
44 * Relay streams associated with this ctf trace.
45 * Updates are protected by the stream_list lock.
46 * Traversals are protected by RCU.
47 */
48 struct cds_list_head stream_list;
49 pthread_mutex_t stream_list_lock;
50
51 /*
52 * Node within session trace hash table. Node is indexed by
53 * stream path name.
54 */
55 struct lttng_ht_node_str node;
56 struct rcu_head rcu_node; /* For call_rcu teardown. */
57 };
58
59 struct ctf_trace *ctf_trace_get_by_path_or_create(struct relay_session *session,
60 char *path_name);
61 bool ctf_trace_get(struct ctf_trace *trace);
62 void ctf_trace_put(struct ctf_trace *trace);
63
64 int ctf_trace_close(struct ctf_trace *trace);
65
66 struct relay_viewer_stream *ctf_trace_get_viewer_metadata_stream(struct ctf_trace *trace);
67
68 #endif /* _CTF_TRACE_H */
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