File: Wm5Time.cpp

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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)

#include "Wm5CorePCH.h"
#include "Wm5Time.h"

namespace Wm5
{

#ifdef __APPLE__
#include <sys/time.h>
static timeval gsInitial;
static bool gsInitializedTime = false;
#else
#include <sys/timeb.h>
static long gsInitialSec = 0;
static long gsInitialUSec = 0;
static bool gsInitializedTime = false;
#endif

//----------------------------------------------------------------------------
int64_t GetTimeInMicroseconds ()
{
#ifdef __APPLE__
    if (!gsInitializedTime)
    {
        gsInitializedTime = true;
        gettimeofday(&gsInitial, 0);
    }

    struct timeval currentTime;
    gettimeofday(&currentTime, 0);
    
    struct timeval deltaTime;
    timersub(&currentTime, &gsInitial, &deltaTime);

    return 1000000*deltaTime.tv_sec + deltaTime.tv_usec;
#else
    struct timeb currentTime;

    if (!gsInitializedTime)
    {
        gsInitializedTime = true;
        ftime(&currentTime);
        gsInitialSec = (long)currentTime.time;
        gsInitialUSec = 1000*currentTime.millitm;
    }

    ftime(&currentTime);
    long currentSec = (long)currentTime.time;
    long currentUSec = 1000*currentTime.millitm;
    long deltaSec = currentSec - gsInitialSec;
    long deltaUSec = currentUSec - gsInitialUSec;
    if (deltaUSec < 0)
    {
        deltaUSec += 1000000;
        --deltaSec;
    }

    return 1000000*deltaSec + deltaUSec;
#endif
}
//----------------------------------------------------------------------------
double GetTimeInSeconds ()
{
    int64_t microseconds = GetTimeInMicroseconds();
    return 1e-06*microseconds;
}
//----------------------------------------------------------------------------

}