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/*
* include/types/freq_ctr.h
* This file contains structure declarations for frequency counters.
*
* Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _TYPES_FREQ_CTR_H
#define _TYPES_FREQ_CTR_H
#include <common/config.h>
/* The implicit freq_ctr counter counts a rate of events per second. It is the
* preferred form to count rates over a one-second period, because it does not
* involve any divide.
*/
struct freq_ctr {
unsigned int curr_sec; /* start date of current period (seconds from now.tv_sec) */
unsigned int curr_ctr; /* cumulated value for current period */
unsigned int prev_ctr; /* value for last period */
};
/* The generic freq_ctr_period counter counts a rate of events per period, where
* the period has to be known by the user. The period is measured in ticks and
* must be at least 2 ticks long. This form is slightly more CPU intensive than
* the per-second form.
*/
struct freq_ctr_period {
unsigned int curr_tick; /* start date of current period (wrapping ticks) */
unsigned int curr_ctr; /* cumulated value for current period */
unsigned int prev_ctr; /* value for last period */
};
#endif /* _TYPES_FREQ_CTR_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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