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/kern/subr_counter.c

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    1 /*-
    2  * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: stable/10/sys/kern/subr_counter.c 262739 2014-03-04 14:46:30Z glebius $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/lock.h>
   34 #include <sys/mutex.h>
   35 #include <sys/proc.h>
   36 #include <sys/sched.h>
   37 #include <sys/smp.h>
   38 #include <sys/sysctl.h>
   39 #include <vm/uma.h>
   40 
   41 #define IN_SUBR_COUNTER_C
   42 #include <sys/counter.h>
   43  
   44 void
   45 counter_u64_zero(counter_u64_t c)
   46 {
   47 
   48         counter_u64_zero_inline(c);
   49 }
   50 
   51 uint64_t
   52 counter_u64_fetch(counter_u64_t c)
   53 {
   54 
   55         return (counter_u64_fetch_inline(c));
   56 }
   57 
   58 counter_u64_t
   59 counter_u64_alloc(int flags)
   60 {
   61         counter_u64_t r;
   62 
   63         r = uma_zalloc(pcpu_zone_64, flags);
   64         if (r != NULL)
   65                 counter_u64_zero(r);
   66 
   67         return (r);
   68 }
   69 
   70 void
   71 counter_u64_free(counter_u64_t c)
   72 {
   73 
   74         uma_zfree(pcpu_zone_64, c);
   75 }
   76 
   77 int
   78 sysctl_handle_counter_u64(SYSCTL_HANDLER_ARGS)
   79 {
   80         uint64_t out;
   81         int error;
   82 
   83         out = counter_u64_fetch(*(counter_u64_t *)arg1);
   84 
   85         error = SYSCTL_OUT(req, &out, sizeof(uint64_t));
   86 
   87         if (error || !req->newptr)
   88                 return (error);
   89 
   90         /*
   91          * Any write attempt to a counter zeroes it.
   92          */
   93         counter_u64_zero(*(counter_u64_t *)arg1);
   94 
   95         return (0);
   96 }

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