mirror of
https://github.com/transmission/transmission
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54 lines
1.8 KiB
C
54 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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#ifndef __TRANSMISSION__
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#error only libtransmission should #include this header.
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#endif
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#ifndef TR_RECENT_HISTORY_H
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#define TR_RECENT_HISTORY_H
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/**
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* A generic short-term memory object that remembers how many times
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* something happened over the last N seconds.
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*
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* For example, it could count how many are bytes transferred
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* to estimate the speed over the last N seconds.
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*/
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typedef struct tr_recentHistory tr_recentHistory;
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/**
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* @brief create a new tr_recentHistory object.
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* @param seconds how many seconds of history this object should remember
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* @param precision how precise the history should be, in fractions of a second.
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* For a precision of 1/20th of a second, use a precision of 20.
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*/
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tr_recentHistory * tr_historyNew( unsigned int seconds, unsigned int precision );
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/** @brief destroy an existing tr_recentHistory object. */
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void tr_historyFree( tr_recentHistory * );
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/**
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* @brief add a counter to the recent history object.
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* @param when the current time in msec, such as from tr_time_msec()
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* @param n how many items to add to the history's counter
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*/
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void tr_historyAdd( tr_recentHistory *, uint64_t when, unsigned int n );
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/**
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* @brief count how many events have occurred in the last N seconds.
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* @param when the current time in msec, such as from tr_time_msec()
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* @param seconds how many seconds to count back through.
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*/
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unsigned int tr_historyGet( const tr_recentHistory *, uint64_t when, unsigned int seconds );
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#endif
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