ICRS Eurobot 2013
Dependencies: mbed mbed-rtos Servo QEI
Diff: tvmet/util/Timer.h
- Revision:
- 15:9c5aaeda36dc
diff -r c638d4b9ee94 -r 9c5aaeda36dc tvmet/util/Timer.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/tvmet/util/Timer.h Sat Apr 06 20:57:54 2013 +0000 @@ -0,0 +1,98 @@ +/* + * Tiny Vector Matrix Library + * Dense Vector Matrix Libary of Tiny size using Expression Templates + * + * Copyright (C) 2001 - 2007 Olaf Petzold <opetzold@users.sourceforge.net> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * $Id: Timer.h,v 1.9 2007-06-23 15:58:59 opetzold Exp $ + */ + +#ifndef TVMET_UTIL_TIMER_H +#define TVMET_UTIL_TIMER_H + +#if defined(TVMET_HAVE_SYS_TIME_H) && defined(TVMET_HAVE_UNISTD_H) +# include <sys/time.h> +# include <sys/resource.h> +# include <unistd.h> +#else +# include <ctime> +#endif + +namespace tvmet { + +namespace util { + +/** + \class Timer Timer.h "tvmet/util/Timer.h" + \brief A quick& dirty portable timer, measures elapsed time. + + It is recommended that implementations measure wall clock rather than CPU + time since the intended use is performance measurement on systems where + total elapsed time is more important than just process or CPU time. + + The accuracy of timings depends on the accuracy of timing information + provided by the underlying platform, and this varies from platform to + platform. +*/ + +class Timer +{ + Timer(const Timer&); + Timer& operator=(const Timer&); + +public: // types + typedef double time_t; + +public: + /** starts the timer immediatly. */ + Timer() { m_start_time = getTime(); } + + /** restarts the timer */ + void restart() { m_start_time = getTime(); } + + /** return elapsed time in seconds */ + time_t elapsed() const { return (getTime() - m_start_time); } + +private: + time_t getTime() const { +#if defined(TVMET_HAVE_SYS_TIME_H) && defined(TVMET_HAVE_UNISTD_H) + getrusage(RUSAGE_SELF, &m_rusage); + time_t sec = m_rusage.ru_utime.tv_sec; // user, no system time + time_t usec = m_rusage.ru_utime.tv_usec; // user, no system time + return sec + usec/1e6; +#else + return static_cast<time_t>(std::clock()) / static_cast<time_t>(CLOCKS_PER_SEC); +#endif + } + +private: +#if defined(TVMET_HAVE_SYS_TIME_H) && defined(TVMET_HAVE_UNISTD_H) + mutable struct rusage m_rusage; +#endif + time_t m_start_time; +}; + +} // namespace util + +} // namespace tvmet + +#endif // TVMET_UTIL_TIMER_H + +// Local Variables: +// mode:C++ +// tab-width:8 +// End: