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Annotation of src/usr.bin/top/loadavg.h, Revision 1.3

1.3     ! deraadt     1: /*     $OpenBSD: loadavg.h,v 1.2 1997/08/17 01:01:59 downsj Exp $      */
        !             2:
        !             3: /*
        !             4:  *  Top users/processes display for Unix
        !             5:  *  Version 3
        !             6:  *
        !             7:  * Copyright (c) 1984, 1989, William LeFebvre, Rice University
        !             8:  * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  *
        !            19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            20:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            21:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            22:  * IN NO EVENT SHALL THE AUTHOR OR HIS EMPLOYER BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            23:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            24:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            25:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            26:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            27:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            28:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            29:  */
1.1       downsj     30:
                     31: /*
                     32:  *  Top - a top users display for Berkeley Unix
                     33:  *
                     34:  *  Defines required to access load average figures.
                     35:  *
                     36:  *  This include file sets up everything we need to access the load average
                     37:  *  values in the kernel in a machine independent way.  First, it sets the
                     38:  *  typedef "load_avg" to be either double or long (depending on what is
                     39:  *  needed), then it defines these macros appropriately:
                     40:  *
                     41:  *     loaddouble(la) - convert load_avg to double.
                     42:  *     intload(i)     - convert integer to load_avg.
                     43:  */
                     44:
                     45: /*
                     46:  * We assume that if FSCALE is defined, then avenrun and ccpu are type long.
                     47:  * If your machine is an exception (mips, perhaps?) then make adjustments
                     48:  * here.
                     49:  *
                     50:  * Defined types:  load_avg for load averages, pctcpu for cpu percentages.
                     51:  */
1.2       downsj     52: #if defined(mips) && !defined(__OpenBSD__)
1.1       downsj     53: # include <sys/fixpoint.h>
                     54: # if defined(FBITS) && !defined(FSCALE)
                     55: #  define FSCALE (1 << FBITS)  /* mips */
                     56: # endif
                     57: #endif
                     58:
                     59: #ifdef FSCALE
                     60: # define FIXED_LOADAVG FSCALE
                     61: # define FIXED_PCTCPU FSCALE
                     62: #endif
                     63:
                     64: #ifdef ibm032
                     65: # undef FIXED_LOADAVG
                     66: # undef FIXED_PCTCPU
                     67: # define FIXED_PCTCPU PCT_SCALE
                     68: #endif
                     69:
                     70:
                     71: #ifdef FIXED_PCTCPU
                     72:   typedef long pctcpu;
                     73: # define pctdouble(p) ((double)(p) / FIXED_PCTCPU)
                     74: #else
                     75: typedef double pctcpu;
                     76: # define pctdouble(p) (p)
                     77: #endif
                     78:
                     79: #ifdef FIXED_LOADAVG
                     80:   typedef long load_avg;
                     81: # define loaddouble(la) ((double)(la) / FIXED_LOADAVG)
                     82: # define intload(i) ((int)((i) * FIXED_LOADAVG))
                     83: #else
                     84:   typedef double load_avg;
                     85: # define loaddouble(la) (la)
                     86: # define intload(i) ((double)(i))
                     87: #endif