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91d76f53 | 1 | /* |
5b74c7b1 DG |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
6 | * as published by the Free Software Foundation; only version 2 |
7 | * of the License. | |
5b74c7b1 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | */ | |
18 | ||
19 | #ifndef _LTT_SESSION_H | |
20 | #define _LTT_SESSION_H | |
21 | ||
6c9cc2ab | 22 | //#include <lttng/lttng.h> |
20fe2104 | 23 | #include <urcu/list.h> |
d4a2a84a | 24 | |
b5541356 DG |
25 | /* |
26 | * Tracing session list | |
27 | * | |
28 | * Statically declared in session.c and can be accessed by using | |
29 | * get_session_list() function that returns the pointer to the list. | |
30 | */ | |
5b74c7b1 | 31 | struct ltt_session_list { |
b5541356 DG |
32 | /* |
33 | * This lock protects any read/write access to the list and count (which is | |
34 | * basically the list size). All public functions in session.c acquire this | |
35 | * lock and release it before returning. If none of those functions are | |
36 | * used, the lock MUST be acquired in order to iterate or/and do any | |
37 | * actions on that list. | |
38 | */ | |
39 | pthread_mutex_t lock; | |
6c9cc2ab | 40 | |
b5541356 | 41 | /* |
6c9cc2ab DG |
42 | * Number of element in the list. The session list lock MUST be acquired if |
43 | * this counter is used when iterating over the session list. | |
b5541356 DG |
44 | */ |
45 | unsigned int count; | |
6c9cc2ab DG |
46 | |
47 | /* Linked list head */ | |
5b74c7b1 DG |
48 | struct cds_list_head head; |
49 | }; | |
50 | ||
b5541356 DG |
51 | /* |
52 | * This data structure contains information needed to identify a tracing | |
53 | * session for both LTTng and UST. | |
5b74c7b1 DG |
54 | */ |
55 | struct ltt_session { | |
20fe2104 | 56 | char *name; |
f3ed775e | 57 | char *path; |
20fe2104 | 58 | struct ltt_kernel_session *kernel_session; |
b5541356 | 59 | struct cds_list_head ust_traces; |
1657e9bb | 60 | unsigned int ust_trace_count; |
b5541356 DG |
61 | /* |
62 | * Protect any read/write on this session data structure. This lock must be | |
63 | * acquired *before* using any public functions declared below. Use | |
64 | * lock_session() and unlock_session() for that. | |
65 | */ | |
66 | pthread_mutex_t lock; | |
67 | struct cds_list_head list; | |
5b74c7b1 DG |
68 | }; |
69 | ||
70 | /* Prototypes */ | |
f3ed775e DG |
71 | int create_session(char *name, char *path); |
72 | int destroy_session(char *name); | |
6c9cc2ab | 73 | |
b5541356 | 74 | void lock_session(struct ltt_session *session); |
6c9cc2ab | 75 | void lock_session_list(void); |
b5541356 | 76 | void unlock_session(struct ltt_session *session); |
6c9cc2ab DG |
77 | void unlock_session_list(void); |
78 | ||
5b74c7b1 | 79 | struct ltt_session *find_session_by_name(char *name); |
8c0faa1d | 80 | struct ltt_session_list *get_session_list(void); |
5b74c7b1 DG |
81 | |
82 | #endif /* _LTT_SESSION_H */ |