mfranz
dcb95d131b
- coplied license headers from h(xx) files to respective c(xx) files - removed trailing spaces - fixe $Id$ - fixed typos
132 lines
3.1 KiB
C++
132 lines
3.1 KiB
C++
/**
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* \file stopwatch.hxx
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* Timer class, for use in benchmarking
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* Based on blitz/Timer.h
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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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* 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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* $Id$
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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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 <simgear_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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#if defined( WIN32 ) && defined( HAVE_GETRUSAGE )
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# undef HAVE_GETRUSAGE
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#endif // WIN32
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#if defined( HAVE_GETRUSAGE )
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# if defined( __FreeBSD__ )
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# include <sys/types.h>
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# endif
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# include <sys/time.h>
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# include <sys/resource.h>
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# include <unistd.h>
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#elif defined( WIN32 )
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# include <windows.h>
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#else
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# include <time.h>
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#endif
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/**
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* A high resolutions timing class
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*/
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class StopWatch {
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public:
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/** Constructor */
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StopWatch() {
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// state_ = uninitialized;
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}
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/** Start counting time */
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void start() {
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// state_ = running;
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t1_ = systemTime();
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}
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/** Stop counting time */
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void stop() {
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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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/** @return the elapsed time between start and stop */
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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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#if defined( 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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#elif defined( WIN32 )
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return double(GetTickCount()) * double(1e-3);
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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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#if defined( 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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