StopWatchWin.h
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/**
* Copyright 1993-2015 NVIDIA Corporation. All rights reserved.
*
* Please refer to the NVIDIA end user license agreement (EULA) associated
* with this source code for terms and conditions that govern your use of
* this software. Any use, reproduction, disclosure, or distribution of
* this software and related documentation outside the terms of the EULA
* is strictly prohibited.
*
*/
#ifndef NV_NPP_UTIL_STOP_WATCH_WIN_H
#define NV_NPP_UTIL_STOP_WATCH_WIN_H
// includes, system
#define WINDOWS_LEAN_AND_MEAN
#include <windows.h>
#undef min
#undef max
namespace npp
{
/// Windows specific implementation of StopWatch
class StopWatchWin
{
protected:
//! Constructor, default
StopWatchWin();
// Destructor
~StopWatchWin();
public:
//! Start time measurement
inline void start();
//! Stop time measurement
inline void stop();
//! Reset time counters to zero
inline void reset();
//! Time in msec. after start. If the stop watch is still running (i.e. there
//! was no call to stop()) then the elapsed time is returned, otherwise the
//! time between the last start() and stop call is returned
inline const double elapsed() const;
private:
// member variables
//! Start of measurement
LARGE_INTEGER start_time;
//! End of measurement
LARGE_INTEGER end_time;
//! Time difference between the last start and stop
double diff_time;
//! TOTAL time difference between starts and stops
double total_time;
//! flag if the stop watch is running
bool running;
//! tick frequency
static double freq;
//! flag if the frequency has been set
static bool freq_set;
};
// functions, inlined
////////////////////////////////////////////////////////////////////////////////
//! Start time measurement
////////////////////////////////////////////////////////////////////////////////
inline void
StopWatchWin::start()
{
QueryPerformanceCounter((LARGE_INTEGER *) &start_time);
running = true;
}
////////////////////////////////////////////////////////////////////////////////
//! Stop time measurement and increment add to the current diff_time summation
//! variable. Also increment the number of times this clock has been run.
////////////////////////////////////////////////////////////////////////////////
inline void
StopWatchWin::stop()
{
QueryPerformanceCounter((LARGE_INTEGER *) &end_time);
diff_time = (float)
(((double) end_time.QuadPart - (double) start_time.QuadPart) / freq);
total_time += diff_time;
running = false;
}
////////////////////////////////////////////////////////////////////////////////
//! Reset the timer to 0. Does not change the timer running state but does
//! recapture this point in time as the current start time if it is running.
////////////////////////////////////////////////////////////////////////////////
inline void
StopWatchWin::reset()
{
diff_time = 0;
total_time = 0;
if (running)
{
QueryPerformanceCounter((LARGE_INTEGER *) &start_time);
}
}
////////////////////////////////////////////////////////////////////////////////
//! Time in msec. after start. If the stop watch is still running (i.e. there
//! was no call to stop()) then the elapsed time is returned added to the
//! current diff_time sum, otherwise the current summed time difference alone
//! is returned.
////////////////////////////////////////////////////////////////////////////////
inline const double
StopWatchWin::elapsed() const
{
// Return the TOTAL time to date
double retval = total_time;
if (running)
{
LARGE_INTEGER temp;
QueryPerformanceCounter((LARGE_INTEGER *) &temp);
retval +=
(((double)(temp.QuadPart - start_time.QuadPart)) / freq);
}
return retval;
}
} // npp namespace
#endif // NV_NPP_UTIL_STOP_WATCH_WIN_H