ebde2dd1dbfc77cfb08c541f898ed89f76253138
[lttng-tools.git] / src / bin / lttng-relayd / viewer-session.h
1 #ifndef _VIEWER_SESSION_H
2 #define _VIEWER_SESSION_H
3
4 /*
5 * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
6 * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
7 * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 *
9 * SPDX-License-Identifier: GPL-2.0-only
10 *
11 */
12
13 #include <limits.h>
14 #include <inttypes.h>
15 #include <pthread.h>
16 #include <urcu/list.h>
17 #include <urcu/ref.h>
18
19 #include <common/hashtable/hashtable.h>
20 #include <common/trace-chunk.h>
21
22 #include "session.h"
23
24 struct relay_viewer_session {
25 /*
26 * Session list. Updates are protected by the session_list_lock.
27 * Traversals are protected by RCU.
28 * This list limits the design to having the sessions in at most
29 * one viewer session.
30 */
31 struct cds_list_head session_list; /* RCU list. */
32 pthread_mutex_t session_list_lock; /* Protects list updates. */
33 /* Once set, the current trace chunk of a viewer must not change. */
34 struct lttng_trace_chunk *current_trace_chunk;
35 };
36
37 struct relay_viewer_session *viewer_session_create(void);
38 void viewer_session_destroy(struct relay_viewer_session *vsession);
39 void viewer_session_close(struct relay_viewer_session *vsession);
40
41 enum lttng_viewer_attach_return_code viewer_session_attach(
42 struct relay_viewer_session *vsession,
43 struct relay_session *session);
44 int viewer_session_is_attached(struct relay_viewer_session *vsession,
45 struct relay_session *session);
46 void viewer_session_close_one_session(struct relay_viewer_session *vsession,
47 struct relay_session *session);
48 int viewer_session_set_trace_chunk_copy(struct relay_viewer_session *vsession,
49 struct lttng_trace_chunk *relay_session_trace_chunk);
50
51 #endif /* _VIEWER_SESSION_H */
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