--- /dev/null	2016-10-25 08:46:44.038854975 +0200
+++ new/src/share/vm/evtrace/traceBufferQueue.hpp	2016-10-25 10:40:13.689780512 +0200
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved.
+ *
+ * This file is part of the Lock Contention Tracing Subsystem for the HotSpot
+ * Virtual Machine, which is developed at Christian Doppler Laboratory on
+ * Monitoring and Evolution of Very-Large-Scale Software Systems. Please
+ * contact us at <http://mevss.jku.at/> if you need additional information
+ * or have any questions.
+ *
+ * This code 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 code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef SHARE_VM_EVTRACE_TRACEBUFFERQUEUE_HPP
+#define SHARE_VM_EVTRACE_TRACEBUFFERQUEUE_HPP
+
+#include "memory/allocation.hpp"
+
+class TraceBuffer;
+
+class TraceBufferQueue: public CHeapObj<mtEventTracing> {
+private:
+  volatile jlong _enqueue_ops;
+  volatile jlong _dequeue_ops;
+  volatile int _mtx;
+  TraceBuffer * volatile _head;
+  TraceBuffer * volatile _tail;
+
+  class SpinLocker;
+
+public:
+  TraceBufferQueue();
+  virtual ~TraceBufferQueue();
+
+  bool is_empty() { return (_head == NULL); }
+  size_t count();
+
+  void enqueue(TraceBuffer *buffer);
+  TraceBuffer * try_dequeue();
+
+  jlong fill_mark()   { return _dequeue_ops; }
+  bool has_dequeued_at_mark(jlong mark) { return (_dequeue_ops >= mark); }
+
+  jlong enqueue_ops() { return _enqueue_ops; }
+  jlong dequeue_ops() { return _dequeue_ops; }
+};
+
+#endif /* SHARE_VM_EVTRACE_TRACEBUFFERQUEUE_HPP */