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/*=========================================================================
Program: Visualization Toolkit
Module: TestAtomic.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 "vtkAtomicTypes.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"
#include "vtkMultiThreader.h"
#include <algorithm>
static vtkAtomicInt32 TotalAtomic(0);
static vtkAtomicInt64 TotalAtomic64(0);
static const int Target = 1000000;
static int Values32[Target+1];
static int Values64[Target+1];
static vtkMTimeType MTimeValues[Target];
static int NumThreads = 5;
// uncomment the following line if you want to see
// the difference between using atomics and not
//#define SHOW_DIFFERENCE
#ifdef SHOW_DIFFERENCE
static int Total = 0;
static vtkTypeInt64 Total64 = 0;
#endif
VTK_THREAD_RETURN_TYPE MyFunction(void *)
{
vtkNew<vtkObject> AnObject;
for (int i=0; i<Target/NumThreads; i++)
{
#ifdef SHOW_DIFFERENCE
Total++;
Total64++;
#endif
int idx = ++TotalAtomic;
Values32[idx] = 1;
idx = ++TotalAtomic64;
Values64[idx] = 1;
AnObject->Modified();
MTimeValues[idx - 1] = AnObject->GetMTime();
}
return VTK_THREAD_RETURN_VALUE;
}
VTK_THREAD_RETURN_TYPE MyFunction2(void *)
{
for (int i=0; i<Target/NumThreads; i++)
{
--TotalAtomic;
--TotalAtomic64;
}
return VTK_THREAD_RETURN_VALUE;
}
VTK_THREAD_RETURN_TYPE MyFunction3(void *)
{
for (int i=0; i<Target/NumThreads; i++)
{
int idx = TotalAtomic += 1;
Values32[idx]++;
idx = TotalAtomic64 += 1;
Values64[idx]++;
}
return VTK_THREAD_RETURN_VALUE;
}
VTK_THREAD_RETURN_TYPE MyFunction4(void *)
{
for (int i=0; i<Target/NumThreads; i++)
{
TotalAtomic++;
TotalAtomic += 1;
TotalAtomic--;
TotalAtomic -= 1;
TotalAtomic64++;
TotalAtomic64 += 1;
TotalAtomic64--;
TotalAtomic64 -= 1;
}
return VTK_THREAD_RETURN_VALUE;
}
int TestAtomic(int, char*[])
{
#ifdef SHOW_DIFFERENCE
Total = 0;
Total64 = 0;
#endif
TotalAtomic = 0;
TotalAtomic64 = 0;
for (int i=0; i<=Target; i++)
{
Values32[i] = 0;
Values64[i] = 0;
}
vtkNew<vtkMultiThreader> mt;
mt->SetSingleMethod(MyFunction, NULL);
mt->SetNumberOfThreads(NumThreads);
mt->SingleMethodExecute();
mt->SetSingleMethod(MyFunction2, NULL);
mt->SingleMethodExecute();
mt->SetSingleMethod(MyFunction3, NULL);
mt->SingleMethodExecute();
// Making sure that atomic incr returned unique
// values each time. We expect all numbers from
// 1 to Target to be 2.
if (Values32[0] != 0)
{
cout << "Expecting Values32[0] to be 0. Got "
<< Values32[0] << endl;
return 1;
}
if (Values64[0] != 0)
{
cout << "Expecting Values64[0] to be 0. Got "
<< Values64[0] << endl;
return 1;
}
for (int i=1; i<=Target; i++)
{
if (Values32[i] != 2)
{
cout << "Expecting Values32[" << i << "] to be 2. Got "
<< Values32[i] << endl;
return 1;
}
if (Values64[i] != 2)
{
cout << "Expecting Values64[" << i << "] to be 2. Got "
<< Values64[i] << endl;
return 1;
}
}
vtkMTimeType *from = MTimeValues, *to = MTimeValues + Target;
std::sort(from, to);
if (std::unique(from, to) != to)
{
cout << "Found duplicate MTime Values" << endl;
return 1;
}
mt->SetSingleMethod(MyFunction4, NULL);
mt->SingleMethodExecute();
#ifdef SHOW_DIFFERENCE
cout << Total << " " << TotalAtomic.load() << endl;
cout << Total64 << " " << TotalAtomic64.load() << endl;
#endif
if (TotalAtomic.load() != Target)
{
return 1;
}
if (TotalAtomic64.load() != Target)
{
return 1;
}
return 0;
}
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