269 lines
8.9 KiB
C
269 lines
8.9 KiB
C
/*
|
|
* This file Copyright (C) 2008-2009 Charles Kerr <charles@transmissionbt.com>
|
|
*
|
|
* This file is licensed by the GPL version 2. Works owned by the
|
|
* Transmission project are granted a special exemption to clause 2(b)
|
|
* so that the bulk of its code can remain under the MIT license.
|
|
* This exemption does not extend to derived works not owned by
|
|
* the Transmission project.
|
|
*
|
|
* $Id$
|
|
*/
|
|
|
|
#ifndef __TRANSMISSION__
|
|
#error only libtransmission should #include this header.
|
|
#endif
|
|
|
|
#ifndef TR_BANDWIDTH_H
|
|
#define TR_BANDWIDTH_H
|
|
|
|
#include "transmission.h"
|
|
#include "ptrarray.h"
|
|
#include "utils.h" /* tr_new(), tr_free() */
|
|
|
|
struct tr_peerIo;
|
|
|
|
/**
|
|
* @addtogroup networked_io Networked IO
|
|
* @{
|
|
*/
|
|
|
|
/* these are PRIVATE IMPLEMENTATION details that should not be touched.
|
|
* it's included in the header for inlining and composition. */
|
|
enum
|
|
{
|
|
HISTORY_MSEC = 2000,
|
|
INTERVAL_MSEC = HISTORY_MSEC,
|
|
GRANULARITY_MSEC = 200,
|
|
HISTORY_SIZE = ( INTERVAL_MSEC / GRANULARITY_MSEC ),
|
|
MAGIC_NUMBER = 43143
|
|
};
|
|
|
|
/* these are PRIVATE IMPLEMENTATION details that should not be touched.
|
|
* it's included in the header for inlining and composition. */
|
|
struct bratecontrol
|
|
{
|
|
int newest;
|
|
struct { uint64_t date, size; } transfers[HISTORY_SIZE];
|
|
};
|
|
|
|
/* these are PRIVATE IMPLEMENTATION details that should not be touched.
|
|
* it's included in the header for inlining and composition. */
|
|
struct tr_band
|
|
{
|
|
tr_bool isLimited;
|
|
tr_bool honorParentLimits;
|
|
size_t bytesLeft;
|
|
double desiredSpeed;
|
|
struct bratecontrol raw;
|
|
struct bratecontrol piece;
|
|
};
|
|
|
|
/**
|
|
* Bandwidth is an object for measuring and constraining bandwidth speeds.
|
|
*
|
|
* Bandwidth objects can be "stacked" so that a peer can be made to obey
|
|
* multiple constraints (for example, obeying the global speed limit and a
|
|
* per-torrent speed limit).
|
|
*
|
|
* HIERARCHY
|
|
*
|
|
* Transmission's bandwidth hierarchy is a tree.
|
|
* At the top is the global bandwidth object owned by tr_session.
|
|
* Its children are per-torrent bandwidth objects owned by tr_torrent.
|
|
* Underneath those are per-peer bandwidth objects owned by tr_peer.
|
|
*
|
|
* tr_session also owns a tr_handshake's bandwidths, so that the handshake
|
|
* I/O can be counted in the global raw totals. When the handshake is done,
|
|
* the bandwidth's ownership passes to a tr_peer.
|
|
*
|
|
* MEASURING
|
|
*
|
|
* When you ask a bandwidth object for its speed, it gives the speed of the
|
|
* subtree underneath it as well. So you can get Transmission's overall
|
|
* speed by quering tr_session's bandwidth, per-torrent speeds by asking
|
|
* tr_torrent's bandwidth, and per-peer speeds by asking tr_peer's bandwidth.
|
|
*
|
|
* CONSTRAINING
|
|
*
|
|
* Call tr_bandwidthAllocate() periodically. tr_bandwidth knows its current
|
|
* speed and will decide how many bytes to make available over the
|
|
* user-specified period to reach the user-specified desired speed.
|
|
* If appropriate, it notifies its peer-ios that new bandwidth is available.
|
|
*
|
|
* tr_bandwidthAllocate() operates on the tr_bandwidth subtree, so usually
|
|
* you'll only need to invoke it for the top-level tr_session bandwidth.
|
|
*
|
|
* The peer-ios all have a pointer to their associated tr_bandwidth object,
|
|
* and call tr_bandwidthClamp() before performing I/O to see how much
|
|
* bandwidth they can safely use.
|
|
*/
|
|
typedef struct tr_bandwidth
|
|
{
|
|
/* these are PRIVATE IMPLEMENTATION details that should not be touched.
|
|
* it's included in the header for inlining and composition. */
|
|
|
|
struct tr_band band[2];
|
|
struct tr_bandwidth * parent;
|
|
tr_priority_t priority;
|
|
int magicNumber;
|
|
tr_session * session;
|
|
tr_ptrArray children; /* struct tr_bandwidth */
|
|
struct tr_peerIo * peer;
|
|
}
|
|
tr_bandwidth;
|
|
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
tr_bandwidth* tr_bandwidthConstruct( tr_bandwidth * bandwidth,
|
|
tr_session * session,
|
|
tr_bandwidth * parent );
|
|
|
|
/** @brief create a new tr_bandwidth object */
|
|
static TR_INLINE tr_bandwidth* tr_bandwidthNew( tr_session * session, tr_bandwidth * parent )
|
|
{
|
|
return tr_bandwidthConstruct( tr_new0( tr_bandwidth, 1 ), session, parent );
|
|
}
|
|
|
|
tr_bandwidth* tr_bandwidthDestruct( tr_bandwidth * bandwidth );
|
|
|
|
/** @brief free a tr_bandwidth object */
|
|
static TR_INLINE void tr_bandwidthFree( tr_bandwidth * bandwidth )
|
|
{
|
|
tr_free( tr_bandwidthDestruct( bandwidth ) );
|
|
}
|
|
|
|
/** @brief test to see if the pointer refers to a live bandwidth object */
|
|
static TR_INLINE tr_bool tr_isBandwidth( const tr_bandwidth * b )
|
|
{
|
|
return ( b != NULL ) && ( b->magicNumber == MAGIC_NUMBER );
|
|
}
|
|
|
|
/******
|
|
*******
|
|
******/
|
|
|
|
/**
|
|
* @brief Set the desired speed (in KiB/s) for this bandwidth subtree.
|
|
* @see tr_bandwidthAllocate
|
|
* @see tr_bandwidthGetDesiredSpeed
|
|
*/
|
|
static TR_INLINE void tr_bandwidthSetDesiredSpeed( tr_bandwidth * bandwidth,
|
|
tr_direction dir,
|
|
double desiredSpeed )
|
|
{
|
|
bandwidth->band[dir].desiredSpeed = desiredSpeed;
|
|
}
|
|
|
|
/**
|
|
* @brief Get the desired speed (in KiB/s) for ths bandwidth subtree.
|
|
* @see tr_bandwidthSetDesiredSpeed
|
|
*/
|
|
static TR_INLINE double
|
|
tr_bandwidthGetDesiredSpeed( const tr_bandwidth * bandwidth,
|
|
tr_direction dir )
|
|
{
|
|
return bandwidth->band[dir].desiredSpeed;
|
|
}
|
|
|
|
/**
|
|
* @brief Set whether or not this bandwidth should throttle its peer-io's speeds
|
|
*/
|
|
static TR_INLINE void tr_bandwidthSetLimited( tr_bandwidth * bandwidth,
|
|
tr_direction dir,
|
|
tr_bool isLimited )
|
|
{
|
|
bandwidth->band[dir].isLimited = isLimited;
|
|
}
|
|
|
|
/**
|
|
* @return nonzero if this bandwidth throttles its peer-ios speeds
|
|
*/
|
|
static TR_INLINE tr_bool tr_bandwidthIsLimited( const tr_bandwidth * bandwidth,
|
|
tr_direction dir )
|
|
{
|
|
return bandwidth->band[dir].isLimited;
|
|
}
|
|
|
|
/**
|
|
* @brief allocate the next period_msec's worth of bandwidth for the peer-ios to consume
|
|
*/
|
|
void tr_bandwidthAllocate ( tr_bandwidth * bandwidth,
|
|
tr_direction direction,
|
|
int period_msec );
|
|
|
|
/**
|
|
* @brief clamps byteCount down to a number that this bandwidth will allow to be consumed
|
|
*/
|
|
size_t tr_bandwidthClamp ( const tr_bandwidth * bandwidth,
|
|
tr_direction direction,
|
|
size_t byteCount );
|
|
|
|
/******
|
|
*******
|
|
******/
|
|
|
|
/** @brief Get the raw total of bytes read or sent by this bandwidth subtree. */
|
|
double tr_bandwidthGetRawSpeed( const tr_bandwidth * bandwidth,
|
|
const uint64_t now,
|
|
const tr_direction direction );
|
|
|
|
/** @brief Get the number of piece data bytes read or sent by this bandwidth subtree. */
|
|
double tr_bandwidthGetPieceSpeed( const tr_bandwidth * bandwidth,
|
|
const uint64_t now,
|
|
const tr_direction direction );
|
|
|
|
/**
|
|
* @brief Notify the bandwidth object that some of its allocated bandwidth has been consumed.
|
|
* This is is usually invoked by the peer-io after a read or write.
|
|
*/
|
|
void tr_bandwidthUsed ( tr_bandwidth * bandwidth,
|
|
tr_direction direction,
|
|
size_t byteCount,
|
|
tr_bool isPieceData );
|
|
|
|
/******
|
|
*******
|
|
******/
|
|
|
|
void tr_bandwidthSetParent ( tr_bandwidth * bandwidth,
|
|
tr_bandwidth * parent );
|
|
|
|
/**
|
|
* Almost all the time we do want to honor a parents' bandwidth cap, so that
|
|
* (for example) a peer is constrained by a per-torrent cap and the global cap.
|
|
* But when we set a torrent's speed mode to TR_SPEEDLIMIT_UNLIMITED, then
|
|
* in that particular case we want to ignore the global speed limit...
|
|
*/
|
|
static TR_INLINE void tr_bandwidthHonorParentLimits ( tr_bandwidth * bandwidth,
|
|
tr_direction direction,
|
|
tr_bool isEnabled )
|
|
{
|
|
assert( tr_isBandwidth( bandwidth ) );
|
|
assert( tr_isDirection( direction ) );
|
|
|
|
bandwidth->band[direction].honorParentLimits = isEnabled;
|
|
}
|
|
|
|
static TR_INLINE tr_bool tr_bandwidthAreParentLimitsHonored( tr_bandwidth * bandwidth,
|
|
tr_direction direction )
|
|
{
|
|
assert( tr_isBandwidth( bandwidth ) );
|
|
assert( tr_isDirection( direction ) );
|
|
|
|
return bandwidth->band[direction].honorParentLimits;
|
|
}
|
|
|
|
/******
|
|
*******
|
|
******/
|
|
|
|
void tr_bandwidthSetPeer( tr_bandwidth * bandwidth,
|
|
struct tr_peerIo * peerIo );
|
|
|
|
/* @} */
|
|
#endif
|