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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> |
639ddf68 | 32 | #include <common/trace-chunk.h> |
2f8f53af DG |
33 | |
34 | /* | |
35 | * Represents a session for the relay point of view | |
36 | */ | |
37 | struct relay_session { | |
38 | /* | |
7591bab1 MD |
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. | |
2f8f53af DG |
42 | */ |
43 | uint64_t id; | |
23c8ff50 | 44 | lttng_uuid sessiond_uuid; |
36d2e35d | 45 | char session_name[LTTNG_NAME_MAX]; |
9cf3eb20 | 46 | char hostname[LTTNG_HOST_NAME_MAX]; |
2f8f53af | 47 | uint32_t live_timer; |
2a174661 | 48 | |
7591bab1 MD |
49 | /* Session in snapshot mode. */ |
50 | bool snapshot; | |
51 | ||
52 | /* | |
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. | |
57 | */ | |
58 | ||
59 | struct urcu_ref ref; | |
7591bab1 MD |
60 | |
61 | pthread_mutex_t lock; | |
62 | ||
63 | /* major/minor version used for this session. */ | |
64 | uint32_t major; | |
65 | uint32_t minor; | |
66 | ||
67 | bool viewer_attached; | |
68 | /* Tell if the session connection has been closed on the streaming side. */ | |
69 | bool connection_closed; | |
2a174661 | 70 | |
98ba050e JR |
71 | /* |
72 | * Tell if the session is currently living in a exiting relayd and | |
73 | * should be cleaned forcefully without waiting for pending data or | |
74 | * pending ctrl data. | |
75 | */ | |
76 | bool aborted; | |
77 | ||
2a174661 DG |
78 | /* Contains ctf_trace object of that session indexed by path name. */ |
79 | struct lttng_ht *ctf_traces_ht; | |
2f8f53af DG |
80 | |
81 | /* | |
7591bab1 MD |
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. | |
86 | * | |
87 | * Updates are protected by the recv_list_lock. | |
88 | * Traversals are protected by RCU. | |
89 | * recv_list_lock also protects stream_count. | |
2f8f53af | 90 | */ |
7591bab1 MD |
91 | struct cds_list_head recv_list; /* RCU list. */ |
92 | uint32_t stream_count; | |
93 | pthread_mutex_t recv_list_lock; | |
94 | ||
2f8f53af DG |
95 | /* |
96 | * Flag checked and exchanged with uatomic_cmpxchg to tell the | |
97 | * viewer-side if new streams got added since the last check. | |
98 | */ | |
99 | unsigned long new_streams; | |
100 | ||
101 | /* | |
7591bab1 | 102 | * Node in the global session hash table. |
2f8f53af | 103 | */ |
7591bab1 | 104 | struct lttng_ht_node_u64 session_n; |
c3b7390b JD |
105 | /* |
106 | * Member of the session list in struct relay_viewer_session. | |
7591bab1 MD |
107 | * Updates are protected by the relay_viewer_session |
108 | * session_list_lock. Traversals are protected by RCU. | |
c3b7390b | 109 | */ |
7591bab1 | 110 | struct cds_list_head viewer_session_node; |
639ddf68 | 111 | struct lttng_trace_chunk *current_trace_chunk; |
7591bab1 | 112 | struct rcu_head rcu_node; /* For call_rcu teardown. */ |
2f8f53af DG |
113 | }; |
114 | ||
7591bab1 MD |
115 | struct relay_session *session_create(const char *session_name, |
116 | const char *hostname, uint32_t live_timer, | |
23c8ff50 JG |
117 | bool snapshot, const lttng_uuid sessiond_uuid, |
118 | uint32_t major, uint32_t minor); | |
7591bab1 MD |
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); | |
2a174661 | 122 | |
7591bab1 | 123 | int session_close(struct relay_session *session); |
98ba050e JR |
124 | int session_abort(struct relay_session *session); |
125 | ||
7591bab1 | 126 | void print_sessions(void); |
2f8f53af DG |
127 | |
128 | #endif /* _SESSION_H */ |