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 1.2  1998/11/02 18:28:31  curt
  29  * Additional win32 support.
  30  *
  31  * Revision 1.1  1998/09/01 19:06:30  curt
  32  * Initial revision.
  33  *
  34  * Revision 1.4  1998/03/14 00:04:47  tveldhui
  35  * 0.2-alpha-05
  36  *
  37  * Revision 1.3  1997/07/16 14:51:20  tveldhui
  38  * Update: Alpha release 0.2 (Arrays)
  39  *
  40  * Revision 1.2  1997/01/24 14:42:00  tveldhui
  41  * Periodic RCS update
  42  *
  43  */
  44
  45 // This class is not portable to non System V platforms.
  46 // It will need to be rewritten for Windows, NT, Mac.
  47 // NEEDS_WORK
  48
  49 #ifndef _STOPWATCH_HXX
  50 #define _STOPWATCH_HXX
  51
  52 #ifndef __cplusplus
  53 # error This library requires C++
  54 #endif
  55
  56 #ifdef HAVE_CONFIG_H
  57 #  include "config.h"
  58 #endif
  59
  60 #if defined(__linux__) && ! defined(HAVE_GETRUSAGE)
  61 #  define HAVE_GETRUSAGE
  62 #endif
  63
  64 #if defined( WIN32 ) && defined( HAVE_GETRUSAGE )
  65 #  undef HAVE_GETRUSAGE
  66 #endif // WIN32
  67
  68 #if defined( HAVE_GETRUSAGE )
  69 #  include <sys/resource.h>
  70 #elif defined( WIN32 )
  71 #  include <windows.h>
  72 #else
  73 #  include <time.h>
  74 #endif
  75
  76 class StopWatch {
  77
  78 public:
  79     StopWatch()
  80     {
  81 //         state_ = uninitialized;
  82     }
  83
  84     void start()
  85     {
  86 //         state_ = running;
  87         t1_ = systemTime();
  88     }
  89
  90     void stop()
  91     {
  92         t2_ = systemTime();
  93 //      BZPRECONDITION(state_ == running);
  94 //      state_ = stopped;
  95     }
  96
  97     double elapsedSeconds()
  98     {
  99 //         BZPRECONDITION(state_ == stopped);
 100         return t2_ - t1_;
 101     }
 102
 103 private:
 104     StopWatch(StopWatch&) { }
 105     void operator=(StopWatch&) { }
 106
 107     double systemTime()
 108     {
 109 #if defined( HAVE_GETRUSAGE )
 110         getrusage(RUSAGE_SELF, &resourceUsage_);
 111         double seconds = resourceUsage_.ru_utime.tv_sec
 112             + resourceUsage_.ru_stime.tv_sec;
 113         double micros  = resourceUsage_.ru_utime.tv_usec
 114             + resourceUsage_.ru_stime.tv_usec;
 115         return seconds + micros/1.0e6;
 116 #elif defined( WIN32 )
 117         return double(GetTickCount()) * double(1e-3);
 118 #else
 119         return clock() / (double) CLOCKS_PER_SEC;
 120 #endif
 121     }
 122
 123 //     enum { uninitialized, running, stopped } state_;
 124
 125 #if defined( HAVE_GETRUSAGE )
 126     struct rusage resourceUsage_;
 127 #endif
 128
 129     double t1_, t2_;
 130 };
 131
 132 #endif // _STOPWATCH_HXX
 133