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/*=========================================================================
Program: Visualization Toolkit
Module: vtkSMPTools.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 "vtkSMPTools.h"
#include <omp.h>
#include <algorithm>
namespace
{
int vtkSMPNumberOfSpecifiedThreads = 0;
}
void vtkSMPTools::Initialize(int numThreads)
{
# pragma omp single
if (numThreads)
{
vtkSMPNumberOfSpecifiedThreads = numThreads;
omp_set_num_threads(numThreads);
}
}
int vtkSMPTools::GetEstimatedNumberOfThreads()
{
return vtk::detail::smp::GetNumberOfThreads();
}
int vtk::detail::smp::GetNumberOfThreads()
{
return vtkSMPNumberOfSpecifiedThreads ? vtkSMPNumberOfSpecifiedThreads :
omp_get_max_threads();
}
void vtk::detail::smp::vtkSMPTools_Impl_For_OpenMP(vtkIdType first,
vtkIdType last, vtkIdType grain, ExecuteFunctorPtrType functorExecuter,
void *functor)
{
if (grain <= 0)
{
vtkIdType estimateGrain = (last - first)/(omp_get_max_threads() * 4);
grain = (estimateGrain > 0) ? estimateGrain : 1;
}
# pragma omp parallel for schedule(runtime)
for (vtkIdType from = first; from < last; from += grain)
{
functorExecuter(functor, from, grain, last);
}
}
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