lib/libkinfo/kinfo_pcpu.h

   1 /*
   2  * Copyright (c) 2004, 2005 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Hiten Pandya <hmp@dragonflybsd.org>.
   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  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/lib/libkinfo/kinfo_pcpu.h,v 1.2 2005/04/27 16:16:30 hmp Exp $
  35  */
  36
  37 /*
  38  * Common code for managing per-cpu statistics counters.
  39  */
  40
  41 #ifndef _STRING_H_
  42 #include <string.h>
  43 #endif
  44
  45 #define PCPU_STATISTICS_PROT(proto,type) \
  46 void proto ##_pcpu_statistics(type *percpu, type *total, int ncpu)
  47
  48 #define PCPU_STATISTICS_FUNC(proto,type,fldtype)              \
  49 void                                                          \
  50 proto ##_pcpu_statistics(type *percpu, type *total, int ncpu) \
  51 {                                                             \
  52     int cpu, off, siz;                                        \
  53     siz = sizeof(type);                                       \
  54                                                               \
  55     if (!percpu || !total)                                    \
  56         return;                                               \
  57                                                               \
  58     bzero(total, siz);                                        \
  59     if (ncpu == 1) {                                          \
  60         *total = percpu[0];                                   \
  61     } else {                                                  \
  62         for (cpu = 0; cpu < ncpu; ++cpu) {                    \
  63             for (off = 0; off < siz; off += sizeof(fldtype)) {\
  64                 *(fldtype *)((char *)(*(&total)) + off) +=    \
  65                 *(fldtype *)((char *)&percpu[cpu] + off);     \
  66             }                                                 \
  67         }                                                     \
  68     }                                                         \
  69 }