relayd: create sessiond trace chunk registry on session creation
[lttng-tools.git] / src / bin / lttng-relayd / session.h
CommitLineData
7591bab1
MD
1#ifndef _SESSION_H
2#define _SESSION_H
3
2f8f53af
DG
4/*
5 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
6 * David Goulet <dgoulet@efficios.com>
7591bab1 7 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
2f8f53af
DG
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
2f8f53af
DG
23#include <limits.h>
24#include <inttypes.h>
25#include <pthread.h>
c3b7390b 26#include <urcu/list.h>
7591bab1 27#include <urcu/ref.h>
2f8f53af 28
36d2e35d 29#include <lttng/constant.h>
2f8f53af 30#include <common/hashtable/hashtable.h>
23c8ff50 31#include <common/compat/uuid.h>
2f8f53af
DG
32
33/*
34 * Represents a session for the relay point of view
35 */
36struct relay_session {
37 /*
7591bab1
MD
38 * This session id is generated by the relay daemon to guarantee
39 * its uniqueness even when serving multiple session daemons.
40 * It is used to match a set of streams to their session.
2f8f53af
DG
41 */
42 uint64_t id;
23c8ff50 43 lttng_uuid sessiond_uuid;
36d2e35d 44 char session_name[LTTNG_NAME_MAX];
9cf3eb20 45 char hostname[LTTNG_HOST_NAME_MAX];
2f8f53af 46 uint32_t live_timer;
2a174661 47
7591bab1
MD
48 /* Session in snapshot mode. */
49 bool snapshot;
50
51 /*
52 * Session has no back reference to its connection because it
53 * has a life-time that can be longer than the consumer connection's
54 * life-time; a reference can still be held by the viewer
55 * connection through the viewer streams.
56 */
57
58 struct urcu_ref ref;
7591bab1
MD
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;
2a174661 69
98ba050e
JR
70 /*
71 * Tell if the session is currently living in a exiting relayd and
72 * should be cleaned forcefully without waiting for pending data or
73 * pending ctrl data.
74 */
75 bool aborted;
76
2a174661
DG
77 /* Contains ctf_trace object of that session indexed by path name. */
78 struct lttng_ht *ctf_traces_ht;
2f8f53af
DG
79
80 /*
7591bab1
MD
81 * This contains streams that are received on that connection.
82 * It's used to store them until we get the streams sent
83 * command. When this is received, we remove those streams from
84 * the list and publish them.
85 *
86 * Updates are protected by the recv_list_lock.
87 * Traversals are protected by RCU.
88 * recv_list_lock also protects stream_count.
2f8f53af 89 */
7591bab1
MD
90 struct cds_list_head recv_list; /* RCU list. */
91 uint32_t stream_count;
92 pthread_mutex_t recv_list_lock;
93
2f8f53af
DG
94 /*
95 * Flag checked and exchanged with uatomic_cmpxchg to tell the
96 * viewer-side if new streams got added since the last check.
97 */
98 unsigned long new_streams;
99
100 /*
7591bab1 101 * Node in the global session hash table.
2f8f53af 102 */
7591bab1 103 struct lttng_ht_node_u64 session_n;
c3b7390b
JD
104 /*
105 * Member of the session list in struct relay_viewer_session.
7591bab1
MD
106 * Updates are protected by the relay_viewer_session
107 * session_list_lock. Traversals are protected by RCU.
c3b7390b 108 */
7591bab1
MD
109 struct cds_list_head viewer_session_node;
110 struct rcu_head rcu_node; /* For call_rcu teardown. */
2f8f53af
DG
111};
112
7591bab1
MD
113struct relay_session *session_create(const char *session_name,
114 const char *hostname, uint32_t live_timer,
23c8ff50
JG
115 bool snapshot, const lttng_uuid sessiond_uuid,
116 uint32_t major, uint32_t minor);
7591bab1
MD
117struct relay_session *session_get_by_id(uint64_t id);
118bool session_get(struct relay_session *session);
119void session_put(struct relay_session *session);
2a174661 120
7591bab1 121int session_close(struct relay_session *session);
98ba050e
JR
122int session_abort(struct relay_session *session);
123
7591bab1 124void print_sessions(void);
2f8f53af
DG
125
126#endif /* _SESSION_H */
This page took 0.063212 seconds and 4 git commands to generate.