/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-    */
/* ex: set filetype=cpp softtabstop=4 shiftwidth=4 tabstop=4 cindent expandtab: */

/*
  $Id: osaStopwatch.cpp,v 1.2 2007/04/26 19:33:57 anton Exp $

  Author(s):  Ofri Sadowsky
  Created on: 2005-02-17

  (C) Copyright 2005-2007 Johns Hopkins University (JHU), All Rights
  Reserved.

--- begin cisst license - do not edit ---

This software is provided "as is" under an open source license, with
no warranty.  The complete license can be found in license.txt and
http://www.cisst.org/cisst/license.txt.

--- end cisst license ---
*/

#include <cisstOSAbstraction/osaStopwatch.h>

bool osaStopwatch::HasHighPerformanceCounter = false;

double osaStopwatch::GetTimeGranularity() const
{
#if (CISST_OS == CISST_WINDOWS) || (CISST_OS == CISST_CYGWIN)
    static bool gotPerformanceFreq = false;
    static LARGE_INTEGER frequency = { 0, 0 };
    if (!gotPerformanceFreq) {
        HasHighPerformanceCounter = (::QueryPerformanceFrequency( &frequency )) ? true : false;
        gotPerformanceFreq = true;
    }
    if (HasHighPerformanceCounter)
        return 1.0 / double( frequency.QuadPart );
    else
        return 0.001;
#elif (CISST_COMPILER == CISST_GCC)
    return 1.0e-6;
#endif
}

// ****************************************************************************
//                              Change History
// ****************************************************************************
//
//  $Log: osaStopwatch.cpp,v $
//  Revision 1.2  2007/04/26 19:33:57  anton
//  All files in libraries: Applied new license text, separate copyright and
//  updated dates, added standard header where missing.
//
//  Revision 1.1  2007/02/16 18:57:55  ofri
//  cisstOSAbstraction library: Added class osaStopwatch based on recent discussion
//
//  Revision 1.2  2006/08/31 18:38:00  ofri
//  mscStopwatch : Rewritten to use Windows "high performance counter" directly.
//
//  Revision 1.1  2005/02/24 16:22:33  ofri
//  Added classes mscDtopwatch and mscOutputFormatter
//
//
// ****************************************************************************