contrib/top/loadavg.h

   1 /*
   2  * Copyright (c) 1984 through 2008, William LeFebvre
   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 are met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *
  16  *     * Neither the name of William LeFebvre nor the names of other
  17  * contributors may be used to endorse or promote products derived from
  18  * this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /*
  34  *  Top - a top users display for Berkeley Unix
  35  *
  36  *  Defines required to access load average figures.
  37  *
  38  *  This include file sets up everything we need to access the load average
  39  *  values in the kernel in a machine independent way.  First, it sets the
  40  *  typedef "load_avg" to be either double or long (depending on what is
  41  *  needed), then it defines these macros appropriately:
  42  *
  43  *      loaddouble(la) - convert load_avg to double.
  44  *      intload(i)     - convert integer to load_avg.
  45  */
  46
  47 /*
  48  * We assume that if FSCALE is defined, then avenrun and ccpu are type long.
  49  * If your machine is an exception (mips, perhaps?) then make adjustments
  50  * here.
  51  *
  52  * Defined types:  load_avg for load averages, pctcpu for cpu percentages.
  53  */
  54 #if defined(mips) && !defined(NetBSD)
  55 # include <sys/fixpoint.h>
  56 # if defined(FBITS) && !defined(FSCALE)
  57 #  define FSCALE (1 << FBITS)   /* mips */
  58 # endif
  59 #endif
  60
  61 #ifdef FSCALE
  62 # define FIXED_LOADAVG FSCALE
  63 # define FIXED_PCTCPU FSCALE
  64 #endif
  65
  66 #ifdef ibm032
  67 # undef FIXED_LOADAVG
  68 # undef FIXED_PCTCPU
  69 # define FIXED_PCTCPU PCT_SCALE
  70 #endif
  71
  72
  73 #ifdef FIXED_PCTCPU
  74   typedef long pctcpu;
  75 # define pctdouble(p) ((double)(p) / FIXED_PCTCPU)
  76 #else
  77 typedef double pctcpu;
  78 # define pctdouble(p) (p)
  79 #endif
  80
  81 #ifdef FIXED_LOADAVG
  82   typedef long load_avg;
  83 # define loaddouble(la) ((double)(la) / FIXED_LOADAVG)
  84 # define intload(i) ((int)((i) * FIXED_LOADAVG))
  85 #else
  86   typedef double load_avg;
  87 # define loaddouble(la) (la)
  88 # define intload(i) ((double)(i))
  89 #endif