dad0cd9296a66bda15705fad50f614c7e96863b3
[lttng-tools.git] / ltt-sessiond / session.h
1 /*
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
6 * as published by the Free Software Foundation; only version 2
7 * of the License.
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
22 //#include <lttng/lttng.h>
23 #include <urcu/list.h>
24
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 */
31 struct ltt_session_list {
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;
40
41 /*
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.
44 */
45 unsigned int count;
46
47 /* Linked list head */
48 struct cds_list_head head;
49 };
50
51 /*
52 * This data structure contains information needed to identify a tracing
53 * session for both LTTng and UST.
54 */
55 struct ltt_session {
56 char *name;
57 char *path;
58 struct ltt_kernel_session *kernel_session;
59 struct cds_list_head ust_traces;
60 unsigned int ust_trace_count;
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;
68 };
69
70 /* Prototypes */
71 int create_session(char *name, char *path);
72 int destroy_session(char *name);
73
74 void lock_session(struct ltt_session *session);
75 void lock_session_list(void);
76 void unlock_session(struct ltt_session *session);
77 void unlock_session_list(void);
78
79 struct ltt_session *find_session_by_name(char *name);
80 struct ltt_session_list *get_session_list(void);
81
82 #endif /* _LTT_SESSION_H */
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