123 lines
2.9 KiB
C++
123 lines
2.9 KiB
C++
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/***************************************************************************
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* stopwatch.hxx Timer class, for use in benchmarking
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*
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* Based on blitz/Timer.h
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*
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* $Id$
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*
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* Copyright (C) 1997,1998 Todd Veldhuizen <tveldhui@seurat.uwaterloo.ca>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Suggestions: blitz-suggest@cybervision.com
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* Bugs: blitz-bugs@cybervision.com
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*
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* For more information, please see the Blitz++ Home Page:
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* http://seurat.uwaterloo.ca/blitz/
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*
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***************************************************************************
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* $Log$
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* Revision 1.1 1998/09/01 19:06:30 curt
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* Initial revision.
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*
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* Revision 1.4 1998/03/14 00:04:47 tveldhui
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* 0.2-alpha-05
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*
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* Revision 1.3 1997/07/16 14:51:20 tveldhui
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* Update: Alpha release 0.2 (Arrays)
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*
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* Revision 1.2 1997/01/24 14:42:00 tveldhui
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* Periodic RCS update
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*
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*/
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// This class is not portable to non System V platforms.
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// It will need to be rewritten for Windows, NT, Mac.
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// NEEDS_WORK
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#ifndef _STOPWATCH_HXX
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#define _STOPWATCH_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#if defined(__linux__) && ! defined(HAVE_GETRUSAGE)
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# define HAVE_GETRUSAGE
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#endif
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#ifdef HAVE_GETRUSAGE
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#include <sys/resource.h>
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#else
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#include <time.h>
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#endif
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class StopWatch {
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public:
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StopWatch()
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{
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// state_ = uninitialized;
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}
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void start()
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{
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// state_ = running;
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t1_ = systemTime();
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}
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void stop()
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{
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t2_ = systemTime();
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// BZPRECONDITION(state_ == running);
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// state_ = stopped;
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}
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double elapsedSeconds()
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{
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// BZPRECONDITION(state_ == stopped);
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return t2_ - t1_;
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}
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private:
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StopWatch(StopWatch&) { }
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void operator=(StopWatch&) { }
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double systemTime()
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{
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#ifdef HAVE_GETRUSAGE
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getrusage(RUSAGE_SELF, &resourceUsage_);
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double seconds = resourceUsage_.ru_utime.tv_sec
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+ resourceUsage_.ru_stime.tv_sec;
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double micros = resourceUsage_.ru_utime.tv_usec
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+ resourceUsage_.ru_stime.tv_usec;
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return seconds + micros/1.0e6;
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#else
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return clock() / (double) CLOCKS_PER_SEC;
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#endif
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}
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// enum { uninitialized, running, stopped } state_;
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#ifdef HAVE_GETRUSAGE
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struct rusage resourceUsage_;
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#endif
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double t1_, t2_;
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};
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#endif // _STOPWATCH_HXX
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