Fix bad cleanup of context structure
[lttng-tools.git] / ltt-sessiond / session.h
CommitLineData
91d76f53 1/*
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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; either version 2
7 * of the License, or (at your option) any later version.
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
5b97ec60 22#include <lttng/lttng.h>
20fe2104 23#include <urcu/list.h>
d4a2a84a 24
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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 31struct ltt_session_list {
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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 * Number of element in the list.
42 */
43 unsigned int count;
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44 struct cds_list_head head;
45};
46
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47/*
48 * This data structure contains information needed to identify a tracing
49 * session for both LTTng and UST.
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50 */
51struct ltt_session {
20fe2104 52 char *name;
f3ed775e 53 char *path;
20fe2104 54 struct ltt_kernel_session *kernel_session;
b5541356 55 struct cds_list_head ust_traces;
1657e9bb 56 unsigned int ust_trace_count;
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57 /*
58 * Protect any read/write on this session data structure. This lock must be
59 * acquired *before* using any public functions declared below. Use
60 * lock_session() and unlock_session() for that.
61 */
62 pthread_mutex_t lock;
63 struct cds_list_head list;
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64};
65
66/* Prototypes */
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67int create_session(char *name, char *path);
68int destroy_session(char *name);
5461b305 69void get_lttng_session(struct lttng_session *sessions);
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70void lock_session(struct ltt_session *session);
71void unlock_session(struct ltt_session *session);
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72struct ltt_session *find_session_by_name(char *name);
73unsigned int get_session_count(void);
8c0faa1d 74struct ltt_session_list *get_session_list(void);
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75
76#endif /* _LTT_SESSION_H */
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