transmission/libtransmission/ratecontrol.c

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/******************************************************************************
* $Id$
*
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* Copyright (c) 2006-2008 Transmission authors and contributors
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*
* 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.
*****************************************************************************/
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#include <string.h> /* memset */
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#include "transmission.h"
#include "platform.h"
#include "ratecontrol.h"
#include "utils.h"
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/* return the xfer rate over the last `interval' seconds in KiB/sec */
static float
rateForInterval( const tr_ratecontrol * r,
int interval_msec,
uint64_t now )
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{
uint64_t bytes = 0;
const uint64_t cutoff = (now?now:tr_date()) - interval_msec;
int i = r->newest;
for( ; ; )
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{
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if( r->transfers[i].date <= cutoff )
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break;
bytes += r->transfers[i].size;
if( --i == -1 ) i = TR_RC_HISTORY_SIZE - 1; /* circular history */
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if( i == r->newest ) break; /* we've come all the way around */
}
return ( bytes / 1024.0 ) * ( 1000.0 / interval_msec );
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}
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/***
****
***/
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float
tr_rcRate( const tr_ratecontrol * r, uint64_t now )
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{
float ret = 0.0f;
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if( r )
ret = rateForInterval( r, TR_RC_HISTORY_MSEC, now );
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return ret;
}
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/***
****
***/
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void
tr_rcTransferred( tr_ratecontrol * r,
size_t size )
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{
const uint64_t now = tr_date ( );
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if( r->transfers[r->newest].date + TR_RC_GRANULARITY_MSEC >= now )
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r->transfers[r->newest].size += size;
else
{
if( ++r->newest == TR_RC_HISTORY_SIZE ) r->newest = 0;
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r->transfers[r->newest].date = now;
r->transfers[r->newest].size = size;
}
}