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  *                      David Goulet <dgoulet@efficios.com>
   7  *               2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License, version 2 only, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  16  * more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along with
  19  * this program; if not, write to the Free Software Foundation, Inc., 51
  20  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #include <limits.h>
  24 #include <inttypes.h>
  25 #include <pthread.h>
  26 #include <urcu/list.h>
  27 #include <urcu/ref.h>
  28
  29 #include <common/hashtable/hashtable.h>
  30
  31 #include "session.h"
  32
  33 struct relay_viewer_session {
  34         /*
  35          * Session list. Updates are protected by the session_list_lock.
  36          * Traversals are protected by RCU.
  37          * This list limits the design to having the sessions in at most
  38          * one viewer session.
  39          */
  40         struct cds_list_head session_list;      /* RCU list. */
  41         pthread_mutex_t session_list_lock;      /* Protects list updates. */
  42 };
  43
  44 struct relay_viewer_session *viewer_session_create(void);
  45 void viewer_session_destroy(struct relay_viewer_session *vsession);
  46 void viewer_session_close(struct relay_viewer_session *vsession);
  47
  48 int viewer_session_attach(struct relay_viewer_session *vsession,
  49                 struct relay_session *session);
  50 int viewer_session_is_attached(struct relay_viewer_session *vsession,
  51                 struct relay_session *session);
  52
  53 #endif /* _VIEWER_SESSION_H */