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+/** 
+ * @file llstat.h
+ * @brief Runtime statistics accumulation.
+ *
+ * Copyright (c) 2001-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#ifndef LL_LLSTAT_H
+#define LL_LLSTAT_H
+
+#include <deque>
+
+#include "lltimer.h"
+#include "llframetimer.h"
+
+//
+// Accumulates statistics for an arbitrary length of time.
+// Does this by maintaining a chain of accumulators, each one
+// accumulation the results of the parent.  Can scale to arbitrary
+// amounts of time with very low memory cost.
+//
+
+class LLStatAccum
+{
+protected:
+        LLStatAccum(bool use_frame_timer);
+        virtual ~LLStatAccum();
+
+public:
+        enum TimeScale {
+                SCALE_SECOND,
+                SCALE_MINUTE,
+                SCALE_TWO_MINUTE,
+                SCALE_HOUR,
+                SCALE_DAY,
+                SCALE_WEEK,
+
+                NUM_SCALES
+        };
+
+        F32 meanValue(TimeScale scale) const;
+                // see the subclasses for the specific meaning of value
+
+        F32 meanValueOverLastSecond() const     { return meanValue(SCALE_SECOND); }
+        F32 meanValueOverLastMinute() const     { return meanValue(SCALE_MINUTE); }
+
+protected:
+        class impl;
+        impl& m;
+};
+
+class LLStatMeasure : public LLStatAccum
+        // gathers statistics about things that are measured
+        // ex.: tempature, time dilation
+{
+public:
+        LLStatMeasure(bool use_frame_timer = true);
+
+        void sample(F64);
+        void sample(S32 v) { sample((F64)v); }
+        void sample(U32 v) { sample((F64)v); }
+        void sample(S64 v) { sample((F64)v); }
+        void sample(U64 v) { sample((F64)v); }
+};
+
+
+class LLStatRate : public LLStatAccum
+        // gathers statistics about things that can be counted over time
+        // ex.: LSL instructions executed, messages sent, simulator frames completed
+        // renders it in terms of rate of thing per second
+{
+public:
+        LLStatRate(bool use_frame_timer = true);
+
+        void count(U32);
+                // used to note that n items have occured
+        
+        void mark() { count(1); }
+                // used for counting the rate thorugh a point in the code
+};
+
+
+class LLTimeBlock;
+
+class LLStatTime : public LLStatAccum
+        // gathers statistics about time spent in a block of code
+        // measure average duration per second in the block
+{
+public:
+        LLStatTime(bool use_frame_timer = false);
+
+private:
+        void start();
+        void stop();
+        friend class LLTimeBlock;
+};
+
+class LLTimeBlock
+{
+public:
+        LLTimeBlock(LLStatTime& stat) : mStat(stat) { mStat.start(); }
+        ~LLTimeBlock()                                                          { mStat.stop(); }
+private:
+        LLStatTime& mStat;
+};
+
+
+
+
+
+class LLStat
+{
+public:
+        LLStat(const U32 num_bins = 32, BOOL use_frame_timer = FALSE);
+        ~LLStat();
+
+        void reset();
+
+        void start();   // Start the timer for the current "frame", otherwise uses the time tracked from
+                                        // the last addValue
+        void addValue(const F32 value = 1.f); // Adds the current value being tracked, and tracks the DT.
+        void addValue(const S32 value) { addValue((F32)value); }
+        void addValue(const U32 value) { addValue((F32)value); }
+
+        void setBeginTime(const F64 time);
+        void addValueTime(const F64 time, const F32 value = 1.f);
+        
+        S32 getCurBin() const;
+        S32 getNextBin() const;
+        
+        F32 getCurrent() const;
+        F32 getCurrentPerSec() const;
+        F64 getCurrentBeginTime() const;
+        F64 getCurrentTime() const;
+        F32 getCurrentDuration() const;
+        
+        F32 getPrev(S32 age) const;                             // Age is how many "addValues" previously - zero is current
+        F32 getPrevPerSec(S32 age) const;               // Age is how many "addValues" previously - zero is current
+        F64 getPrevBeginTime(S32 age) const;
+        F64 getPrevTime(S32 age) const;
+        
+        F32 getBin(S32 bin) const;
+        F32 getBinPerSec(S32 bin) const;
+        F64 getBinBeginTime(S32 bin) const;
+        F64 getBinTime(S32 bin) const;
+
+        F32 getMax() const;
+        F32 getMaxPerSec() const;
+        
+        F32 getMean() const;
+        F32 getMeanPerSec() const;
+        F32 getMeanDuration() const;
+
+        F32 getMin() const;
+        F32 getMinPerSec() const;
+        F32 getMinDuration() const;
+
+        F32 getSum() const;
+        F32 getSumDuration() const;
+
+        U32 getNumValues() const;
+        S32 getNumBins() const;
+
+        F64 getLastTime() const;
+private:
+        BOOL mUseFrameTimer;
+        U32 mNumValues;
+        U32 mNumBins;
+        F32 mLastValue;
+        F64 mLastTime;
+        F32 *mBins;
+        F64 *mBeginTime;
+        F64 *mTime;
+        F32 *mDT;
+        S32 mCurBin;
+        S32 mNextBin;
+        static LLTimer sTimer;
+        static LLFrameTimer sFrameTimer;
+};
+
+#endif // LL_STAT_