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/******************************************************************************\
* Copyright (c) 2016, Robert van Engelen, Genivia Inc. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions are met: *
* *
* (1) Redistributions of source code must retain the above copyright notice, *
* this list of conditions and the following disclaimer. *
* *
* (2) Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* *
* (3) The name of the author may not be used to endorse or promote products *
* derived from this software without specific prior written permission. *
* *
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO *
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, *
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; *
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR *
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
\******************************************************************************/
/**
@file timer.h
@brief Measure elapsed wall-clock time in milliseconds
@author Robert van Engelen - engelen@genivia.com
@copyright (c) 2016-2020, Robert van Engelen, Genivia Inc. All rights reserved.
@copyright (c) BSD-3 License - see LICENSE.txt
*/
#ifndef REFLEX_TIMER_H
#define REFLEX_TIMER_H
#if defined(__WIN32__) || defined(_WIN32) || defined(WIN32) || defined(_WIN64) || defined(__CYGWIN__) || defined(__MINGW32__) || defined(__MINGW64__) || defined(__BORLANDC__)
// disable min/max macros to use std::min and std::max
#define NOMINMAX
#include <windows.h>
namespace reflex {
typedef SYSTEMTIME timer_type;
/// Start timer.
inline void timer_start(timer_type& t) ///< timer to be initialized
{
GetLocalTime(&t);
}
/// Return elapsed time in milliseconds (ms) since the last call up to 1 minute (wraps if elapsed time exceeds 1 minute!)
inline float timer_elapsed(timer_type& t) ///< timer to be updated
{
timer_type now;
GetLocalTime(&now);
float sec = now.wMilliseconds;
sec -= t.wMilliseconds;
t.wMilliseconds = now.wMilliseconds;
sec += 1000.0f * (now.wSecond - t.wSecond);
t.wSecond = now.wSecond;
if (sec < 0.0)
sec += 60000.0;
return sec;
}
} // namespace reflex
#else
#include <cstddef>
#include <sys/time.h>
namespace reflex {
typedef timeval timer_type;
/// Start timer.
inline void timer_start(timer_type& t) ///< timer to be initialized
{
gettimeofday(&t, NULL);
}
/// Return elapsed time in milliseconds (ms) with microsecond precision since the last call up to 1 minute (wraps if elapsed time exceeds 1 minute!)
inline float timer_elapsed(timer_type& t) ///< timer to be updated
{
timer_type now;
gettimeofday(&now, NULL);
float sec = now.tv_usec;
sec -= t.tv_usec;
t.tv_usec = now.tv_usec;
sec = 1000.0 * (now.tv_sec - t.tv_sec) + sec/1000.0;
t.tv_sec = now.tv_sec;
if (sec < 0.0)
sec += 60000.0;
return sec;
}
} // namespace reflex
#endif
#endif
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