Fix: protect the channel's metadata stream using the metadata cache lock
[lttng-tools.git] / src / bin / lttng-relayd / session.h
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1#ifndef _SESSION_H
2#define _SESSION_H
3
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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>
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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
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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>
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30#include <common/hashtable/hashtable.h>
31
32/*
33 * Represents a session for the relay point of view
34 */
35struct relay_session {
36 /*
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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.
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40 */
41 uint64_t id;
36d2e35d 42 char session_name[LTTNG_NAME_MAX];
9cf3eb20 43 char hostname[LTTNG_HOST_NAME_MAX];
2f8f53af 44 uint32_t live_timer;
2a174661 45
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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;
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69
70 /* Contains ctf_trace object of that session indexed by path name. */
71 struct lttng_ht *ctf_traces_ht;
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72
73 /*
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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.
2f8f53af 82 */
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83 struct cds_list_head recv_list; /* RCU list. */
84 uint32_t stream_count;
85 pthread_mutex_t recv_list_lock;
86
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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 /*
7591bab1 94 * Node in the global session hash table.
2f8f53af 95 */
7591bab1 96 struct lttng_ht_node_u64 session_n;
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97 /*
98 * Member of the session list in struct relay_viewer_session.
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99 * Updates are protected by the relay_viewer_session
100 * session_list_lock. Traversals are protected by RCU.
c3b7390b 101 */
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102 struct cds_list_head viewer_session_node;
103 struct rcu_head rcu_node; /* For call_rcu teardown. */
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104};
105
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106struct 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);
109struct relay_session *session_get_by_id(uint64_t id);
110bool session_get(struct relay_session *session);
111void session_put(struct relay_session *session);
2a174661 112
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113int session_close(struct relay_session *session);
114void print_sessions(void);
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115
116#endif /* _SESSION_H */
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