83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
/*
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* This file Copyright (C) 2010 Mnemosyne LLC
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*
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* This file is licensed by the GPL version 2. Works owned by the
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* Transmission project are granted a special exemption to clause 2(b)
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* so that the bulk of its code can remain under the MIT license.
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* This exemption does not extend to derived works not owned by
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* the Transmission project.
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*
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* $Id:$
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*/
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#include "transmission.h"
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#include "history.h"
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#include "utils.h"
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struct history_slice
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{
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double n;
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uint64_t date;
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};
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struct tr_recentHistory
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{
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int newest;
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int sliceCount;
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int precision_msec;
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struct history_slice * slices;
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};
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void
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tr_historyAdd( tr_recentHistory * h, uint64_t now, double n )
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{
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if( h->slices[h->newest].date + h->precision_msec >= now )
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h->slices[h->newest].n += n;
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else {
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if( ++h->newest == h->sliceCount ) h->newest = 0;
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h->slices[h->newest].date = now;
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h->slices[h->newest].n = n;
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}
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}
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double
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tr_historyGet( const tr_recentHistory * h, uint64_t now, int msec )
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{
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double n = 0;
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const uint64_t cutoff = (now?now:tr_date()) - msec;
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int i = h->newest;
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for( ;; )
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{
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if( h->slices[i].date <= cutoff )
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break;
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n += h->slices[i].n;
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if( --i == -1 ) i = h->sliceCount - 1; /* circular history */
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if( i == h->newest ) break; /* we've come all the way around */
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}
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return n;
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}
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tr_recentHistory *
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tr_historyNew( int seconds, int bins_per_second )
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{
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tr_recentHistory * h;
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h = tr_new0( tr_recentHistory, 1 );
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h->precision_msec = 1000 / bins_per_second;
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h->sliceCount = seconds * bins_per_second;
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h->slices = tr_new0( struct history_slice, h->sliceCount );
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return h;
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}
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void
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tr_historyFree( tr_recentHistory * h )
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{
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tr_free( h->slices );
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tr_free( h );
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}
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