transmission/libtransmission/history.h

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/*
* This file Copyright (C) 2010 Mnemosyne LLC
*
* 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_RECENT_HISTORY_H
#define TR_RECENT_HISTORY_H
/**
* A generic short-term memory object that remembers how many times
* something happened over the last N seconds.
*
* For example, it could count how many are bytes transferred
* to estimate the speed over the last N seconds.
*/
typedef struct tr_recentHistory tr_recentHistory;
/**
* @brief create a new tr_recentHistory object.
* @param seconds how many seconds of history this object should remember
* @param precision how precise the history should be, in fractions of a second.
* For a precision of 1/20th of a second, use a precision of 20.
*/
tr_recentHistory * tr_historyNew( unsigned int seconds, unsigned int precision );
/** @brief destroy an existing tr_recentHistory object. */
void tr_historyFree( tr_recentHistory * );
/**
* @brief add a counter to the recent history object.
* @param when the current time in msec, such as from tr_time_msec()
* @param n how many items to add to the history's counter
*/
void tr_historyAdd( tr_recentHistory *, uint64_t when, unsigned int n );
/**
* @brief count how many events have occurred in the last N seconds.
* @param when the current time in msec, such as from tr_time_msec()
* @param seconds how many seconds to count back through.
*/
unsigned int tr_historyGet( const tr_recentHistory *, uint64_t when, unsigned int seconds );
#endif