/** 
 * @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& parent);

		~ThreadRecorder();

		AccumulatorBufferGroup* activate(AccumulatorBufferGroup* recording);
		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(size_t 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*					mParentRecorder;

	};

	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