Lib/Misc/stopwatch.hxx

   1 /***************************************************************************
   2  * stopwatch.hxx        Timer class, for use in benchmarking
   3  *
   4  * Based on blitz/Timer.h
   5  *
   6  * $Id$
   7  *
   8  * Copyright (C) 1997,1998 Todd Veldhuizen <tveldhui@seurat.uwaterloo.ca>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * Suggestions:          blitz-suggest@cybervision.com
  21  * Bugs:                 blitz-bugs@cybervision.com
  22  *
  23  * For more information, please see the Blitz++ Home Page:
  24  *    http://seurat.uwaterloo.ca/blitz/
  25  *
  26  ***************************************************************************
  27  * $Log$
  28  * Revision 1.3  1998/11/20 01:01:03  curt
  29  * FreeBSD support.
  30  *
  31  * Revision 1.2  1998/11/02 18:28:31  curt
  32  * Additional win32 support.
  33  *
  34  * Revision 1.1  1998/09/01 19:06:30  curt
  35  * Initial revision.
  36  *
  37  * Revision 1.4  1998/03/14 00:04:47  tveldhui
  38  * 0.2-alpha-05
  39  *
  40  * Revision 1.3  1997/07/16 14:51:20  tveldhui
  41  * Update: Alpha release 0.2 (Arrays)
  42  *
  43  * Revision 1.2  1997/01/24 14:42:00  tveldhui
  44  * Periodic RCS update
  45  *
  46  */
  47
  48 // This class is not portable to non System V platforms.
  49 // It will need to be rewritten for Windows, NT, Mac.
  50 // NEEDS_WORK
  51
  52 #ifndef _STOPWATCH_HXX
  53 #define _STOPWATCH_HXX
  54
  55 #ifndef __cplusplus
  56 # error This library requires C++
  57 #endif
  58
  59 #ifdef HAVE_CONFIG_H
  60 #  include "config.h"
  61 #endif
  62
  63 #if defined(__linux__) && ! defined(HAVE_GETRUSAGE)
  64 #  define HAVE_GETRUSAGE
  65 #endif
  66
  67 #if defined( WIN32 ) && defined( HAVE_GETRUSAGE )
  68 #  undef HAVE_GETRUSAGE
  69 #endif // WIN32
  70
  71 #if defined( HAVE_GETRUSAGE )
  72 #  if defined( __FreeBSD__ )
  73 #    include <sys/types.h>
  74 #  endif
  75 #  include <sys/time.h>
  76 #  include <sys/resource.h>
  77 #  include <unistd.h>
  78 #elif defined( WIN32 )
  79 #  include <windows.h>
  80 #else
  81 #  include <time.h>
  82 #endif
  83
  84 class StopWatch {
  85
  86 public:
  87     StopWatch()
  88     {
  89 //         state_ = uninitialized;
  90     }
  91
  92     void start()
  93     {
  94 //         state_ = running;
  95         t1_ = systemTime();
  96     }
  97
  98     void stop()
  99     {
 100         t2_ = systemTime();
 101 //      BZPRECONDITION(state_ == running);
 102 //      state_ = stopped;
 103     }
 104
 105     double elapsedSeconds()
 106     {
 107 //         BZPRECONDITION(state_ == stopped);
 108         return t2_ - t1_;
 109     }
 110
 111 private:
 112     StopWatch(StopWatch&) { }
 113     void operator=(StopWatch&) { }
 114
 115     double systemTime()
 116     {
 117 #if defined( HAVE_GETRUSAGE )
 118         getrusage(RUSAGE_SELF, &resourceUsage_);
 119         double seconds = resourceUsage_.ru_utime.tv_sec
 120             + resourceUsage_.ru_stime.tv_sec;
 121         double micros  = resourceUsage_.ru_utime.tv_usec
 122             + resourceUsage_.ru_stime.tv_usec;
 123         return seconds + micros/1.0e6;
 124 #elif defined( WIN32 )
 125         return double(GetTickCount()) * double(1e-3);
 126 #else
 127         return clock() / (double) CLOCKS_PER_SEC;
 128 #endif
 129     }
 130
 131 //     enum { uninitialized, running, stopped } state_;
 132
 133 #if defined( HAVE_GETRUSAGE )
 134     struct rusage resourceUsage_;
 135 #endif
 136
 137     double t1_, t2_;
 138 };
 139
 140 #endif // _STOPWATCH_HXX
 141