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/*
This file is part of GNUnet.
(C) 2010 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file include/gnunet_load_lib.h
* @brief functions related to load calculations
* @author Christian Grothoff
*/
#ifndef GNUNET_LOAD_LIB_H
#define GNUNET_LOAD_LIB_H
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
#include "gnunet_common.h"
#include "gnunet_time_lib.h"
/**
* Opaque load handle.
*/
struct GNUNET_LOAD_Value;
/**
* Create a new load value.
*
* @param autodecline speed at which this value should automatically
* decline in the absence of external events; at the given
* frequency, 0-load values will be added to the load
* @return the new load value
*/
struct GNUNET_LOAD_Value *
GNUNET_LOAD_value_init (struct GNUNET_TIME_Relative autodecline);
/**
* Change the value by which the load automatically declines.
*
* @param load load to update
* @param autodecline frequency of load decline
*/
void
GNUNET_LOAD_value_set_decline (struct GNUNET_LOAD_Value *load,
struct GNUNET_TIME_Relative autodecline);
/**
* Free a load value.
*
* @param lv value to free
*/
#define GNUNET_LOAD_value_free(lv) GNUNET_free (lv)
/**
* Get the current load.
*
* @param load load handle
* @return zero for below-average load, otherwise
* number of std. devs we are above average;
* 100 if the latest updates were so large
* that we could not do proper calculations
*/
double
GNUNET_LOAD_get_load (struct GNUNET_LOAD_Value *load);
/**
* Get the average value given to update so far.
*
* @param load load handle
* @return zero if update was never called
*/
double
GNUNET_LOAD_get_average (struct GNUNET_LOAD_Value *load);
/**
* Update the current load.
*
* @param load to update
* @param data latest measurement value (for example, delay)
*/
void
GNUNET_LOAD_update (struct GNUNET_LOAD_Value *load, uint64_t data);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
/* ifndef GNUNET_LOAD_LIB_H */
#endif
/* end of gnunet_load_lib.h */
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