Fix: code refactoring of viewer streams in relayd
[lttng-tools.git] / src / bin / lttng-relayd / session.h
1 /*
2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #ifndef _SESSION_H
20 #define _SESSION_H
21
22 #include <limits.h>
23 #include <inttypes.h>
24 #include <pthread.h>
25
26 #include <common/hashtable/hashtable.h>
27
28 /*
29 * Represents a session for the relay point of view
30 */
31 struct relay_session {
32 /*
33 * This session id is used to identify a set of stream to a tracing session
34 * but also make sure we have a unique session id associated with a session
35 * daemon which can provide multiple data source.
36 */
37 uint64_t id;
38 struct lttcomm_sock *sock;
39 char session_name[NAME_MAX];
40 char hostname[HOST_NAME_MAX];
41 uint32_t live_timer;
42 struct lttng_ht_node_ulong session_n;
43 struct rcu_head rcu_node;
44 uint32_t viewer_attached;
45 uint32_t stream_count;
46 /* Tell if this session is for a snapshot or not. */
47 unsigned int snapshot:1;
48
49 /*
50 * Indicate version protocol for this session. This is especially useful
51 * for the data thread that has no idea which version it operates on since
52 * linking control/data sockets is non trivial.
53 */
54 uint64_t minor;
55 uint64_t major;
56 /*
57 * Flag checked and exchanged with uatomic_cmpxchg to tell the
58 * viewer-side if new streams got added since the last check.
59 */
60 unsigned long new_streams;
61
62 /*
63 * Used to synchronize the process where we flag every streams readiness
64 * for the viewer when the streams_sent message is received and the viewer
65 * process of sending those streams.
66 */
67 pthread_mutex_t viewer_ready_lock;
68 };
69
70 struct relay_session *session_find_by_id(struct lttng_ht *ht, uint64_t id);
71
72 #endif /* _SESSION_H */
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