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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkTimeStamp.cxx,v $
Language: C++
Date: $Date: 2007-11-21 20:36:52 $
Version: $Revision: 1.16 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
Portions of this code are covered under the VTK copyright.
See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.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 notices for more information.
=========================================================================*/
#include "itkTimeStamp.h"
#include "itkFastMutexLock.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
#if defined(_WIN32)
#include "itkWindows.h"
#endif
namespace itk
{
/**
* Instance creation.
*/
TimeStamp*
TimeStamp
::New()
{
return new Self;
}
/**
* Make sure the new time stamp is greater than all others so far.
*/
void
TimeStamp
::Modified()
{
// Windows optimization
#if defined(WIN32) || defined(_WIN32)
static LONG itkTimeStampTime = 0;
m_ModifiedTime = (unsigned long)InterlockedIncrement(&itkTimeStampTime);
// Mac optimization
#elif defined(__APPLE__) && (MAC_OS_X_VERSION_MIN_REQUIRED >= 1050)
#if __LP64__
// "m_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 itkTimeStampTime = 0;
m_ModifiedTime = (unsigned long)OSAtomicIncrement64Barrier(&itkTimeStampTime);
#else
static volatile int32_t itkTimeStampTime = 0;
m_ModifiedTime = (unsigned long)OSAtomicIncrement32Barrier(&itkTimeStampTime);
#endif
// General case
#else
/**
* Initialize static member
*/
static unsigned long itkTimeStampTime = 0;
/** Used for mutex locking */
static SimpleFastMutexLock TimeStampMutex;
TimeStampMutex.Lock();
m_ModifiedTime = ++itkTimeStampTime;
TimeStampMutex.Unlock();
#endif
}
} // end namespace itk
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