Willy Tarreau | 7f062c4 | 2009-03-05 18:43:00 +0100 | [diff] [blame] | 1 | /* |
Willy Tarreau | 2970b0b | 2010-06-20 07:15:43 +0200 | [diff] [blame] | 2 | * include/types/freq_ctr.h |
| 3 | * This file contains structure declarations for frequency counters. |
| 4 | * |
| 5 | * Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation, version 2.1 |
| 10 | * exclusively. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with this library; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
Willy Tarreau | 7f062c4 | 2009-03-05 18:43:00 +0100 | [diff] [blame] | 21 | |
| 22 | #ifndef _TYPES_FREQ_CTR_H |
| 23 | #define _TYPES_FREQ_CTR_H |
| 24 | |
| 25 | #include <common/config.h> |
| 26 | |
Willy Tarreau | 2970b0b | 2010-06-20 07:15:43 +0200 | [diff] [blame] | 27 | /* The implicit freq_ctr counter counts a rate of events per second. It is the |
| 28 | * preferred form to count rates over a one-second period, because it does not |
| 29 | * involve any divide. |
| 30 | */ |
Willy Tarreau | 7f062c4 | 2009-03-05 18:43:00 +0100 | [diff] [blame] | 31 | struct freq_ctr { |
| 32 | unsigned int curr_sec; /* start date of current period (seconds from now.tv_sec) */ |
| 33 | unsigned int curr_ctr; /* cumulated value for current period */ |
| 34 | unsigned int prev_ctr; /* value for last period */ |
| 35 | }; |
| 36 | |
Willy Tarreau | 2970b0b | 2010-06-20 07:15:43 +0200 | [diff] [blame] | 37 | /* The generic freq_ctr_period counter counts a rate of events per period, where |
| 38 | * the period has to be known by the user. The period is measured in ticks and |
| 39 | * must be at least 2 ticks long. This form is slightly more CPU intensive than |
| 40 | * the per-second form. |
| 41 | */ |
| 42 | struct freq_ctr_period { |
| 43 | unsigned int curr_tick; /* start date of current period (wrapping ticks) */ |
| 44 | unsigned int curr_ctr; /* cumulated value for current period */ |
| 45 | unsigned int prev_ctr; /* value for last period */ |
| 46 | }; |
| 47 | |
Willy Tarreau | 7f062c4 | 2009-03-05 18:43:00 +0100 | [diff] [blame] | 48 | #endif /* _TYPES_FREQ_CTR_H */ |
| 49 | |
| 50 | /* |
| 51 | * Local variables: |
| 52 | * c-indent-level: 8 |
| 53 | * c-basic-offset: 8 |
| 54 | * End: |
| 55 | */ |