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98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
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/*
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* Tiny Vector Matrix Library
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* Dense Vector Matrix Libary of Tiny size using Expression Templates
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*
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* Copyright (C) 2001 - 2003 Olaf Petzold <opetzold@users.sourceforge.net>
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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 Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: Timer.h,v 1.5 2004/09/16 09:14:18 opetzold Exp $
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*/
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#ifndef TVMET_UTIL_TIMER_H
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#define TVMET_UTIL_TIMER_H
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#if defined(TVMET_HAVE_SYS_TIME_H) && defined(TVMET_HAVE_UNISTD_H)
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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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#else
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# include <ctime>
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#endif
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namespace tvmet {
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namespace util {
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/**
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\class Timer Timer.h "tvmet/util/Timer.h"
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\brief A quick& dirty portable timer, measures elapsed time.
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It is recommended that implementations measure wall clock rather than CPU
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time since the intended use is performance measurement on systems where
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total elapsed time is more important than just process or CPU time.
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The accuracy of timings depends on the accuracy of timing information
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provided by the underlying platform, and this varies from platform to
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platform.
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*/
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class Timer
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{
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Timer(const Timer&);
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Timer& operator=(const Timer&);
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public: // types
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typedef double time_t;
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public:
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/** starts the timer immediatly. */
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Timer() { m_start_time = getTime(); }
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/** restarts the timer */
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void restart() { m_start_time = getTime(); }
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/** return elapsed time in seconds */
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time_t elapsed() const { return (getTime() - m_start_time); }
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private:
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time_t getTime() const {
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#if defined(TVMET_HAVE_SYS_TIME_H) && defined(TVMET_HAVE_UNISTD_H)
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getrusage(RUSAGE_SELF, &m_rusage);
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time_t sec = m_rusage.ru_utime.tv_sec; // user, no system time
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time_t usec = m_rusage.ru_utime.tv_usec; // user, no system time
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return sec + usec/1e6;
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#else
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return static_cast<time_t>(std::clock()) / static_cast<time_t>(CLOCKS_PER_SEC);
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#endif
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}
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private:
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#if defined(TVMET_HAVE_SYS_TIME_H) && defined(TVMET_HAVE_UNISTD_H)
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mutable struct rusage m_rusage;
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#endif
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time_t m_start_time;
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};
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} // namespace util
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} // namespace tvmet
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#endif // TVMET_UTIL_TIMER_H
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// Local Variables:
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// mode:C++
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// End:
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