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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 | ||
00187dd4 | 22 | #include <pthread.h> |
20fe2104 | 23 | #include <urcu/list.h> |
d4a2a84a | 24 | |
00187dd4 DG |
25 | #include "trace-kernel.h" |
26 | #include "trace-ust.h" | |
27 | ||
b5541356 DG |
28 | /* |
29 | * Tracing session list | |
30 | * | |
31 | * Statically declared in session.c and can be accessed by using | |
54d01ffb | 32 | * session_get_list() function that returns the pointer to the list. |
b5541356 | 33 | */ |
5b74c7b1 | 34 | struct ltt_session_list { |
b5541356 DG |
35 | /* |
36 | * This lock protects any read/write access to the list and count (which is | |
37 | * basically the list size). All public functions in session.c acquire this | |
38 | * lock and release it before returning. If none of those functions are | |
39 | * used, the lock MUST be acquired in order to iterate or/and do any | |
40 | * actions on that list. | |
41 | */ | |
42 | pthread_mutex_t lock; | |
6c9cc2ab | 43 | |
b5541356 | 44 | /* |
6c9cc2ab DG |
45 | * Number of element in the list. The session list lock MUST be acquired if |
46 | * this counter is used when iterating over the session list. | |
b5541356 DG |
47 | */ |
48 | unsigned int count; | |
6c9cc2ab DG |
49 | |
50 | /* Linked list head */ | |
5b74c7b1 DG |
51 | struct cds_list_head head; |
52 | }; | |
53 | ||
b5541356 DG |
54 | /* |
55 | * This data structure contains information needed to identify a tracing | |
56 | * session for both LTTng and UST. | |
5b74c7b1 DG |
57 | */ |
58 | struct ltt_session { | |
74babd95 DG |
59 | char name[NAME_MAX]; |
60 | char path[PATH_MAX]; | |
20fe2104 | 61 | struct ltt_kernel_session *kernel_session; |
f6a9efaa | 62 | struct ltt_ust_session *ust_session; |
b5541356 DG |
63 | /* |
64 | * Protect any read/write on this session data structure. This lock must be | |
65 | * acquired *before* using any public functions declared below. Use | |
54d01ffb | 66 | * session_lock() and session_unlock() for that. |
b5541356 DG |
67 | */ |
68 | pthread_mutex_t lock; | |
69 | struct cds_list_head list; | |
464dd62d | 70 | int enabled; /* enabled/started flag */ |
44e96653 | 71 | int uid; |
5b74c7b1 DG |
72 | }; |
73 | ||
74 | /* Prototypes */ | |
54d01ffb | 75 | int session_create(char *name, char *path); |
271933a4 | 76 | int session_destroy(struct ltt_session *session); |
6c9cc2ab | 77 | |
54d01ffb DG |
78 | void session_lock(struct ltt_session *session); |
79 | void session_lock_list(void); | |
80 | void session_unlock(struct ltt_session *session); | |
81 | void session_unlock_list(void); | |
6c9cc2ab | 82 | |
54d01ffb DG |
83 | struct ltt_session *session_find_by_name(char *name); |
84 | struct ltt_session_list *session_get_list(void); | |
5b74c7b1 DG |
85 | |
86 | #endif /* _LTT_SESSION_H */ |