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diff --git a/indra/llcommon/lltracethreadrecorder.h b/indra/llcommon/lltracethreadrecorder.h
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+++ b/indra/llcommon/lltracethreadrecorder.h
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+/** 
+ * @file lltrace.h
+ * @brief Runtime statistics accumulation.
+ *
+ * $LicenseInfo:firstyear=2001&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2012, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library 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
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLTRACETHREADRECORDER_H
+#define LL_LLTRACETHREADRECORDER_H
+
+#include "stdtypes.h"
+#include "llpreprocessor.h"
+
+#include "llmutex.h"
+#include "lltraceaccumulators.h"
+#include "llthreadlocalstorage.h"
+
+namespace LLTrace
+{
+	class LL_COMMON_API ThreadRecorder
+	{
+	protected:
+		struct ActiveRecording;
+		typedef std::vector<ActiveRecording*> active_recording_list_t;
+	public:
+		ThreadRecorder();
+		explicit ThreadRecorder(ThreadRecorder& master);
+
+		~ThreadRecorder();
+
+		void activate(AccumulatorBufferGroup* recording, bool from_handoff = false);
+		void deactivate(AccumulatorBufferGroup* recording);
+		active_recording_list_t::iterator bringUpToDate(AccumulatorBufferGroup* recording);
+
+		void addChildRecorder(class ThreadRecorder* child);
+		void removeChildRecorder(class ThreadRecorder* child);
+
+		// call this periodically to gather stats data from child threads
+		void pullFromChildren();
+		void pushToParent();
+
+		TimeBlockTreeNode* getTimeBlockTreeNode(S32 index);
+
+	protected:
+		void init();
+
+	protected:
+		struct ActiveRecording
+		{
+			ActiveRecording(AccumulatorBufferGroup* target);
+
+			AccumulatorBufferGroup*	mTargetRecording;
+			AccumulatorBufferGroup	mPartialRecording;
+
+			void movePartialToTarget();
+		};
+
+		AccumulatorBufferGroup			mThreadRecordingBuffers;
+
+		BlockTimerStackRecord			mBlockTimerStackRecord;
+		active_recording_list_t			mActiveRecordings;
+
+		class BlockTimer*				mRootTimer;
+		TimeBlockTreeNode*				mTimeBlockTreeNodes;
+		size_t							mNumTimeBlockTreeNodes;
+		typedef std::list<class ThreadRecorder*> child_thread_recorder_list_t;
+
+		child_thread_recorder_list_t	mChildThreadRecorders;	// list of child thread recorders associated with this master
+		LLMutex							mChildListMutex;		// protects access to child list
+		LLMutex							mSharedRecordingMutex;
+		AccumulatorBufferGroup			mSharedRecordingBuffers;
+		ThreadRecorder*					mMasterRecorder;
+
+	};
+
+	const LLThreadLocalPointer<ThreadRecorder>& get_thread_recorder();
+	void set_thread_recorder(ThreadRecorder*);
+
+	void set_master_thread_recorder(ThreadRecorder*);
+	ThreadRecorder* get_master_thread_recorder();
+}
+
+#endif // LL_LLTRACETHREADRECORDER_H