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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 "vtkCriticalSection.h"
#include <tbb/task_scheduler_init.h>
struct vtkSMPToolsInit
{
tbb::task_scheduler_init Init;
vtkSMPToolsInit(int numThreads) : Init(numThreads)
{
}
};
static bool vtkSMPToolsInitialized = 0;
static int vtkTBBNumSpecifiedThreads = 0;
static vtkSimpleCriticalSection vtkSMPToolsCS;
//--------------------------------------------------------------------------------
void vtkSMPTools::Initialize(int numThreads)
{
vtkSMPToolsCS.Lock();
if (!vtkSMPToolsInitialized)
{
// If numThreads <= 0, don't create a task_scheduler_init
// and let TBB do the default thing.
if (numThreads > 0)
{
static vtkSMPToolsInit aInit(numThreads);
vtkTBBNumSpecifiedThreads = numThreads;
}
vtkSMPToolsInitialized = true;
}
vtkSMPToolsCS.Unlock();
}
//--------------------------------------------------------------------------------
int vtkSMPTools::GetEstimatedNumberOfThreads()
{
return vtkTBBNumSpecifiedThreads ? vtkTBBNumSpecifiedThreads
: tbb::task_scheduler_init::default_num_threads();
}
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