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 */