llthrottle.h
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- /**
- * @file llthrottle.h
- * @brief LLThrottle class used for network bandwidth control
- *
- * $LicenseInfo:firstyear=2001&license=viewergpl$
- *
- * Copyright (c) 2001-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * 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://secondlifegrid.net/programs/open_source/licensing/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://secondlifegrid.net/programs/open_source/licensing/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.
- * $/LicenseInfo$
- */
- #ifndef LL_LLTHROTTLE_H
- #define LL_LLTHROTTLE_H
- #include "lltimer.h"
- const S32 MAX_THROTTLE_SIZE = 32;
- class LLDataPacker;
- // Single instance of a generic throttle
- class LLThrottle
- {
- public:
- LLThrottle(const F32 throttle = 1.f);
- ~LLThrottle() { }
- void setRate(const F32 rate);
- BOOL checkOverflow(const F32 amount); // I'm about to add an amount, TRUE if would overflow throttle
- BOOL throttleOverflow(const F32 amount); // I just sent amount, TRUE if that overflowed the throttle
- F32 getAvailable(); // Return the available bits
- F32 getRate() const { return mRate; }
- private:
- F32 mLookaheadSecs; // Seconds to look ahead, maximum
- F32 mRate; // BPS available, dynamically adjusted
- F32 mAvailable; // Bits available to send right now on each channel
- F64 mLastSendTime; // Time since last send on this channel
- };
- typedef enum e_throttle_categories
- {
- TC_RESEND,
- TC_LAND,
- TC_WIND,
- TC_CLOUD,
- TC_TASK,
- TC_TEXTURE,
- TC_ASSET,
- TC_EOF
- } EThrottleCats;
- class LLThrottleGroup
- {
- public:
- LLThrottleGroup();
- ~LLThrottleGroup() { }
- void resetDynamicAdjust();
- BOOL checkOverflow(S32 throttle_cat, F32 bits); // I'm about to send bits, TRUE if would overflow channel
- BOOL throttleOverflow(S32 throttle_cat, F32 bits); // I just sent bits, TRUE if that overflowed the channel
- BOOL dynamicAdjust(); // Shift bandwidth from idle channels to busy channels, TRUE if adjustment occurred
- BOOL setNominalBPS(F32* throttle_vec); // TRUE if any value was different, resets adjustment system if was different
- S32 getAvailable(S32 throttle_cat); // Return bits available in the channel
- void packThrottle(LLDataPacker &dp) const;
- void unpackThrottle(LLDataPacker &dp);
- public:
- F32 mThrottleTotal[TC_EOF]; // BPS available, sent by viewer, sum for all simulators
- protected:
- F32 mNominalBPS[TC_EOF]; // BPS available, adjusted to be just this simulator
- F32 mCurrentBPS[TC_EOF]; // BPS available, dynamically adjusted
- F32 mBitsAvailable[TC_EOF]; // Bits available to send right now on each channel
- F32 mBitsSentThisPeriod[TC_EOF]; // Sent in this dynamic allocation period
- F32 mBitsSentHistory[TC_EOF]; // Sent before this dynamic allocation period, adjusted to one period length
- F64 mLastSendTime[TC_EOF]; // Time since last send on this channel
- F64 mDynamicAdjustTime; // Only dynamic adjust every 2 seconds or so.
- };
- #endif