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4693ee0ff7
freq-ctr struct is used by the shm_stats_file API, and more precisely, it is used in the shm_stats_file_object struct for counters. shm_stats_file_object struct requires to be plateform-independent, thus we switch to using explicit size types (AKA fixed width integer types) for freq-ctr, in the attempt to make freq-ctr size and memory mapping consistent from one platform to another. We cannot simply use fixed-width integer because some of them are involved in atomic operations, and forcing a given width could cause build issues on some platforms where atomic ops are not implemented for large integers. Instead we leverage the FIXED_SIZE macro to keep handling the integers as before, but forcing them to be stored using expected number of bytes (unused bytes will simply be ignored). No change of behavior should be expected.
50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
/*
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* include/haproxy/freq_ctr.h
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* This file contains structure declarations for frequency counters.
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*
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* Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _HAPROXY_FREQ_CTR_T_H
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#define _HAPROXY_FREQ_CTR_T_H
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#include <haproxy/api-t.h>
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/* The generic freq_ctr counter counts a rate of events per period, where the
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* period has to be known by the user. The period is measured in ticks and
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* must be at least 2 ticks long. This form is slightly more CPU intensive for
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* reads than the per-second form as it involves a divide.
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*
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* /!\ any change performed here will impact shm-stats-file mapping because the
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* struct is embedded in shm_stats_file_object struct, so proceed with caution
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* and change shm stats file version if needed. Also, fixed width integer types
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* should be used (for portability)
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*/
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struct freq_ctr {
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FIXED_SIZE(4, unsigned int, curr_tick); /* start date of current period (wrapping ticks) */
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FIXED_SIZE(4, unsigned int, curr_ctr); /* cumulated value for current period */
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FIXED_SIZE(4, unsigned int, prev_ctr); /* value for last period */
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};
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#endif /* _HAPROXY_FREQ_CTR_T_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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