StopWatchPack_stopwatch.cpp

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//#include <iostream>
//#include <iosfwd>

#include "StopWatchPack_stopwatch.hpp"
#include "Teuchos_Time.hpp"

double StopWatchPack::seconds(void)
{
  return Teuchos::Time::wallTime();
}

/*

#ifndef _INTEL_CXX

// Implementation using C standard library.
// In MS VC++ 6.0 the precision is only about 0.05 sec.

#include <time.h>

double StopWatchPack::seconds(void)
{
    static const double secs_per_tick = ((double)1.0) / CLOCKS_PER_SEC;
  const clock_t ticks = clock();
  const double sec = ( (double) ticks ) * secs_per_tick;
  //std::cout << "ticks = " << ticks << ", sec = " << sec << std::endl;
    return sec;
}

#else // _INTEL_CXX implementation

// Windows implementation.

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <assert.h>

namespace {

bool seconds_initialized = false;
LARGE_INTEGER start_count, count_freq;  // counts per sec.

inline void seconds_initialize() {
  if( seconds_initialized ) return;
  // Figure out how often the performance counter increments
  ::QueryPerformanceFrequency( &count_freq );
  // Set this thread's priority as high as reasonably possible to prevent
    // timeslice interruptions
    ::SetThreadPriority( ::GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL );
  // Get the first count.
  TEUCHOS_TEST_FOR_EXCEPT( !(  QueryPerformanceCounter( &start_count )  ) );
  seconds_initialized = true;
}

} // end namespace

double StopWatchPack::seconds(void)
{
  seconds_initialize();
  LARGE_INTEGER count;
  QueryPerformanceCounter( &count );
  // "QuadPart" is a 64 bit integer (__int64).  VC++ supports them!
  const double
    sec = (double)( count.QuadPart - start_count.QuadPart ) / count_freq.QuadPart;
  //std::cout << "ticks = " << ticks << ", sec = " << sec << std::endl;
    return sec;
}

#endif  // _INTEL_CXX

*/