Fix: big relayd cleanup and refactor
[lttng-tools.git] / src / bin / lttng-relayd / session.h
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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 */
31struct 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;
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38 char session_name[NAME_MAX];
39 char hostname[HOST_NAME_MAX];
40 uint32_t live_timer;
2a174661 41 struct lttng_ht_node_u64 session_n;
2f8f53af 42 struct rcu_head rcu_node;
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43 uint32_t stream_count;
44 /* Tell if this session is for a snapshot or not. */
45 unsigned int snapshot:1;
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46 /* Tell if the session has been closed on the streaming side. */
47 unsigned int close_flag:1;
48
49 /* Number of viewer using it. Set to 0, it should be destroyed. */
50 int viewer_refcount;
51
52 /* Contains ctf_trace object of that session indexed by path name. */
53 struct lttng_ht *ctf_traces_ht;
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54
55 /*
56 * Indicate version protocol for this session. This is especially useful
57 * for the data thread that has no idea which version it operates on since
58 * linking control/data sockets is non trivial.
59 */
60 uint64_t minor;
61 uint64_t major;
62 /*
63 * Flag checked and exchanged with uatomic_cmpxchg to tell the
64 * viewer-side if new streams got added since the last check.
65 */
66 unsigned long new_streams;
67
68 /*
69 * Used to synchronize the process where we flag every streams readiness
70 * for the viewer when the streams_sent message is received and the viewer
71 * process of sending those streams.
72 */
73 pthread_mutex_t viewer_ready_lock;
74};
75
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76static inline void session_viewer_attach(struct relay_session *session)
77{
78 uatomic_inc(&session->viewer_refcount);
79}
80
81static inline void session_viewer_detach(struct relay_session *session)
82{
83 uatomic_add(&session->viewer_refcount, -1);
84}
85
2f8f53af 86struct relay_session *session_find_by_id(struct lttng_ht *ht, uint64_t id);
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87struct relay_session *session_create(void);
88int session_delete(struct lttng_ht *ht, struct relay_session *session);
89
90/*
91 * Direct destroy without reading the refcount.
92 */
93void session_destroy(struct relay_session *session);
94
95/*
96 * Destroy the session if the refcount is down to 0.
97 */
98void session_try_destroy(struct lttng_ht *ht, struct relay_session *session);
99
100/*
101 * Decrement the viewer refcount and destroy it if down to 0.
102 */
103void session_viewer_try_destroy(struct lttng_ht *ht,
104 struct relay_session *session);
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105
106#endif /* _SESSION_H */
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