5 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
6 * David Goulet <dgoulet@efficios.com>
7 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
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
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.
26 #include <urcu/list.h>
29 #include <lttng/constant.h>
30 #include <common/hashtable/hashtable.h>
31 #include <common/compat/uuid.h>
32 #include <common/trace-chunk.h>
35 * Represents a session for the relay point of view
37 struct relay_session
{
39 * This session id is generated by the relay daemon to guarantee
40 * its uniqueness even when serving multiple session daemons.
41 * It is used to match a set of streams to their session.
44 lttng_uuid sessiond_uuid
;
45 char session_name
[LTTNG_NAME_MAX
];
46 char hostname
[LTTNG_HOST_NAME_MAX
];
49 /* Session in snapshot mode. */
53 * Session has no back reference to its connection because it
54 * has a life-time that can be longer than the consumer connection's
55 * life-time; a reference can still be held by the viewer
56 * connection through the viewer streams.
63 /* major/minor version used for this session. */
68 /* Tell if the session connection has been closed on the streaming side. */
69 bool connection_closed
;
72 * Tell if the session is currently living in a exiting relayd and
73 * should be cleaned forcefully without waiting for pending data or
78 /* Contains ctf_trace object of that session indexed by path name. */
79 struct lttng_ht
*ctf_traces_ht
;
82 * This contains streams that are received on that connection.
83 * It's used to store them until we get the streams sent
84 * command. When this is received, we remove those streams from
85 * the list and publish them.
87 * Updates are protected by the recv_list_lock.
88 * Traversals are protected by RCU.
89 * recv_list_lock also protects stream_count.
91 struct cds_list_head recv_list
; /* RCU list. */
92 uint32_t stream_count
;
93 pthread_mutex_t recv_list_lock
;
96 * Flag checked and exchanged with uatomic_cmpxchg to tell the
97 * viewer-side if new streams got added since the last check.
99 unsigned long new_streams
;
102 * Node in the global session hash table.
104 struct lttng_ht_node_u64 session_n
;
106 * Member of the session list in struct relay_viewer_session.
107 * Updates are protected by the relay_viewer_session
108 * session_list_lock. Traversals are protected by RCU.
110 struct cds_list_head viewer_session_node
;
111 struct lttng_trace_chunk
*current_trace_chunk
;
112 struct rcu_head rcu_node
; /* For call_rcu teardown. */
115 struct relay_session
*session_create(const char *session_name
,
116 const char *hostname
, uint32_t live_timer
,
117 bool snapshot
, const lttng_uuid sessiond_uuid
,
118 uint32_t major
, uint32_t minor
);
119 struct relay_session
*session_get_by_id(uint64_t id
);
120 bool session_get(struct relay_session
*session
);
121 void session_put(struct relay_session
*session
);
123 int session_close(struct relay_session
*session
);
124 int session_abort(struct relay_session
*session
);
126 void print_sessions(void);
128 #endif /* _SESSION_H */