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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.
=========================================================================*/
#include "vtkTimeStamp.h"
#include "vtkObjectFactory.h"
#include "vtkWindows.h"
#include <atomic>
//------------------------------------------------------------------------------
VTK_ABI_NAMESPACE_BEGIN
vtkTimeStamp* vtkTimeStamp::New()
{
// If the factory was unable to create the object, then create it here.
return new vtkTimeStamp;
}
//------------------------------------------------------------------------------
void vtkTimeStamp::Modified()
{
// Here because of a static destruction error? You're not the first. After
// discussion of the tradeoffs, the cost of adding a Schwarz counter on this
// static to ensure it gets destructed is unlikely to be worth the cost over
// just leaking it.
//
// Solutions and their tradeoffs:
//
// - Schwarz counter: each VTK class now has a static initializer function
// that increments an integer. This cannot be inlined or optimized away.
// Adds latency to ParaView startup.
// - Separate library for this static. This adds another library to VTK
// which are already legion. It could not be folded into a kit because
// that would bring you back to the same problem you have today.
// - Leak a heap allocation for it. It's 24 bytes, leaked exactly once, and
// is easily suppressed in Valgrind.
//
// The last solution has been decided to have the smallest downside of these.
//
// Good luck!
#if defined(VTK_USE_64BIT_TIMESTAMPS) || (VTK_SIZEOF_VOID_P == 8)
static std::atomic<uint64_t> GlobalTimeStamp(0U);
#else
static std::atomic<uint32_t> GlobalTimeStamp(0U);
#endif
this->ModifiedTime = (vtkMTimeType)++GlobalTimeStamp;
}
VTK_ABI_NAMESPACE_END
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