The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/counter.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/12.0/sys/sys/counter.h 326256 2017-11-27 15:01:59Z pfg $
   29  */
   30 
   31 #ifndef __SYS_COUNTER_H__
   32 #define __SYS_COUNTER_H__
   33 
   34 typedef uint64_t *counter_u64_t;
   35 
   36 #ifdef _KERNEL
   37 #include <machine/counter.h>
   38 
   39 counter_u64_t   counter_u64_alloc(int);
   40 void            counter_u64_free(counter_u64_t);
   41 
   42 void            counter_u64_zero(counter_u64_t);
   43 uint64_t        counter_u64_fetch(counter_u64_t);
   44 
   45 #define COUNTER_ARRAY_ALLOC(a, n, wait) do {                    \
   46         for (int i = 0; i < (n); i++)                           \
   47                 (a)[i] = counter_u64_alloc(wait);               \
   48 } while (0)
   49 
   50 #define COUNTER_ARRAY_FREE(a, n)        do {                    \
   51         for (int i = 0; i < (n); i++)                           \
   52                 counter_u64_free((a)[i]);                       \
   53 } while (0)
   54 
   55 #define COUNTER_ARRAY_COPY(a, dstp, n)  do {                    \
   56         for (int i = 0; i < (n); i++)                           \
   57                 ((uint64_t *)(dstp))[i] = counter_u64_fetch((a)[i]);\
   58 } while (0)
   59 
   60 #define COUNTER_ARRAY_ZERO(a, n)        do {                    \
   61         for (int i = 0; i < (n); i++)                           \
   62                 counter_u64_zero((a)[i]);                       \
   63 } while (0)
   64 
   65 /*
   66  * counter(9) based rate checking.
   67  */
   68 struct counter_rate {
   69         counter_u64_t   cr_rate;        /* Events since last second */
   70         volatile int    cr_lock;        /* Lock to clean the struct */
   71         int             cr_ticks;       /* Ticks on last clean */
   72         int             cr_over;        /* Over limit since cr_ticks? */
   73 };
   74 
   75 int64_t counter_ratecheck(struct counter_rate *, int64_t);
   76 
   77 #endif  /* _KERNEL */
   78 #endif  /* ! __SYS_COUNTER_H__ */

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