Fix: Relay daemon ownership and reference counting

[lttng-tools.git] / src / bin / lttng-relayd / viewer-session.h

diff --git a/src/bin/lttng-relayd/viewer-session.h b/src/bin/lttng-relayd/viewer-session.h
new file mode 100644 (file)
index 0000000..4013b35
--- /dev/null
+++ b/src/bin/lttng-relayd/viewer-session.h
@@ -0,0 +1,53 @@
+#ifndef _VIEWER_SESSION_H
+#define _VIEWER_SESSION_H
+
+/*
+ * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
+ *                      David Goulet <dgoulet@efficios.com>
+ *               2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <limits.h>
+#include <inttypes.h>
+#include <pthread.h>
+#include <urcu/list.h>
+#include <urcu/ref.h>
+
+#include <common/hashtable/hashtable.h>
+
+#include "session.h"
+
+struct relay_viewer_session {
+       /*
+        * Session list. Updates are protected by the session_list_lock.
+        * Traversals are protected by RCU.
+        * This list limits the design to having the sessions in at most
+        * one viewer session.
+        */
+       struct cds_list_head session_list;      /* RCU list. */
+       pthread_mutex_t session_list_lock;      /* Protects list updates. */
+};
+
+struct relay_viewer_session *viewer_session_create(void);
+void viewer_session_destroy(struct relay_viewer_session *vsession);
+void viewer_session_close(struct relay_viewer_session *vsession);
+
+int viewer_session_attach(struct relay_viewer_session *vsession,
+               struct relay_session *session);
+int viewer_session_is_attached(struct relay_viewer_session *vsession,
+               struct relay_session *session);
+
+#endif /* _VIEWER_SESSION_H */