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/*=========================================================================
Program: Visualization Toolkit
Module: vtkTimeStamp.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
//
// Initialize static member
//
#include "vtkTimeStamp.h"
#include "vtkCriticalSection.h"
#include "vtkObjectFactory.h"
#include "vtkWindows.h"
// OSAtomic.h optimizations only used in 10.5 and later
#if defined(__APPLE__)
#include <AvailabilityMacros.h>
#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1050
#include <libkern/OSAtomic.h>
#endif
#endif
//-------------------------------------------------------------------------
vtkTimeStamp* vtkTimeStamp::New()
{
// If the factory was unable to create the object, then create it here.
return new vtkTimeStamp;
}
//-------------------------------------------------------------------------
void vtkTimeStamp::Modified()
{
// Windows optimization
#if defined(WIN32) || defined(_WIN32)
static LONG vtkTimeStampTime = 0;
this->ModifiedTime = (unsigned long)InterlockedIncrement(&vtkTimeStampTime);
// Mac optimization
#elif defined(__APPLE__) && (MAC_OS_X_VERSION_MIN_REQUIRED >= 1050)
#if __LP64__
// "ModifiedTime" is "unsigned long", a type that changess sizes
// depending on architecture. The atomic increment is safe, since it
// operates on a variable of the exact type needed. The cast does not
// change the size, but does change signedness, which is not ideal.
static volatile int64_t vtkTimeStampTime = 0;
this->ModifiedTime = (unsigned long)OSAtomicIncrement64Barrier(&vtkTimeStampTime);
#else
static volatile int32_t vtkTimeStampTime = 0;
this->ModifiedTime = (unsigned long)OSAtomicIncrement32Barrier(&vtkTimeStampTime);
#endif
// General case
#else
static unsigned long vtkTimeStampTime = 0;
static vtkSimpleCriticalSection TimeStampCritSec;
TimeStampCritSec.Lock();
this->ModifiedTime = ++vtkTimeStampTime;
TimeStampCritSec.Unlock();
#endif
}
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