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transmission/libtransmission/ratecontrol.h
2009-01-11 17:02:04 +00:00

77 lines
2.8 KiB
C

/******************************************************************************
* $Id$
*
* Copyright (c) 2006-2008 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#ifndef __TRANSMISSION__
#error only libtransmission should #include this header.
#endif
#ifndef _TR_RATECONTROL_H_
#define _TR_RATECONTROL_H_
#include <string.h> /* memset() */
#include "transmission.h"
/* these are PRIVATE IMPLEMENTATION details that should not be touched.
* it's included in the header for inlining and composition. */
enum
{
TR_RC_HISTORY_MSEC = 2000,
TR_RC_GRANULARITY_MSEC = 250,
TR_RC_HISTORY_SIZE = ( TR_RC_HISTORY_MSEC / TR_RC_GRANULARITY_MSEC )
};
/* these are PRIVATE IMPLEMENTATION details that should not be touched.
* it's included in the header for inlining and composition. */
struct tr_transfer
{
uint64_t date;
uint64_t size;
};
/* these are PRIVATE IMPLEMENTATION details that should not be touched.
* it's included in the header for inlining and composition. */
typedef struct tr_ratecontrol
{
int newest;
struct tr_transfer transfers[TR_RC_HISTORY_SIZE];
}
tr_ratecontrol;
/***
****
***/
static TR_INLINE void tr_rcConstruct ( tr_ratecontrol * rc ) { memset( rc, 0, sizeof( tr_ratecontrol ) ); }
static TR_INLINE void tr_rcDestruct ( tr_ratecontrol * rc ) { memset( rc, 0xDEAD, sizeof( tr_ratecontrol ) ); }
void tr_rcTransferred ( tr_ratecontrol * ratecontrol,
size_t byteCount );
float tr_rcRate ( const tr_ratecontrol * ratecontrol,
uint64_t now );
#endif