Port: Use LTTNG_NAME_MAX instead of NAME_MAX
[lttng-tools.git] / src / bin / lttng-relayd / session.h
1 #ifndef _SESSION_H
2 #define _SESSION_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 <limits.h>
24 #include <inttypes.h>
25 #include <pthread.h>
26 #include <urcu/list.h>
27 #include <urcu/ref.h>
28
29 #include <lttng/constant.h>
30 #include <common/hashtable/hashtable.h>
31
32 /*
33 * Represents a session for the relay point of view
34 */
35 struct relay_session {
36 /*
37 * This session id is generated by the relay daemon to guarantee
38 * its uniqueness even when serving multiple session daemons.
39 * It is used to match a set of streams to their session.
40 */
41 uint64_t id;
42 char session_name[LTTNG_NAME_MAX];
43 char hostname[HOST_NAME_MAX];
44 uint32_t live_timer;
45
46 /* Session in snapshot mode. */
47 bool snapshot;
48
49 /*
50 * Session has no back reference to its connection because it
51 * has a life-time that can be longer than the consumer connection's
52 * life-time; a reference can still be held by the viewer
53 * connection through the viewer streams.
54 */
55
56 struct urcu_ref ref;
57 /* session reflock nests inside ctf_trace reflock. */
58 pthread_mutex_t reflock;
59
60 pthread_mutex_t lock;
61
62 /* major/minor version used for this session. */
63 uint32_t major;
64 uint32_t minor;
65
66 bool viewer_attached;
67 /* Tell if the session connection has been closed on the streaming side. */
68 bool connection_closed;
69
70 /* Contains ctf_trace object of that session indexed by path name. */
71 struct lttng_ht *ctf_traces_ht;
72
73 /*
74 * This contains streams that are received on that connection.
75 * It's used to store them until we get the streams sent
76 * command. When this is received, we remove those streams from
77 * the list and publish them.
78 *
79 * Updates are protected by the recv_list_lock.
80 * Traversals are protected by RCU.
81 * recv_list_lock also protects stream_count.
82 */
83 struct cds_list_head recv_list; /* RCU list. */
84 uint32_t stream_count;
85 pthread_mutex_t recv_list_lock;
86
87 /*
88 * Flag checked and exchanged with uatomic_cmpxchg to tell the
89 * viewer-side if new streams got added since the last check.
90 */
91 unsigned long new_streams;
92
93 /*
94 * Node in the global session hash table.
95 */
96 struct lttng_ht_node_u64 session_n;
97 /*
98 * Member of the session list in struct relay_viewer_session.
99 * Updates are protected by the relay_viewer_session
100 * session_list_lock. Traversals are protected by RCU.
101 */
102 struct cds_list_head viewer_session_node;
103 struct rcu_head rcu_node; /* For call_rcu teardown. */
104 };
105
106 struct relay_session *session_create(const char *session_name,
107 const char *hostname, uint32_t live_timer,
108 bool snapshot, uint32_t major, uint32_t minor);
109 struct relay_session *session_get_by_id(uint64_t id);
110 bool session_get(struct relay_session *session);
111 void session_put(struct relay_session *session);
112
113 int session_close(struct relay_session *session);
114 void print_sessions(void);
115
116 #endif /* _SESSION_H */
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