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/*=========================================================================
Program: Visualization Toolkit
Module: vtkSMPToolsImpl.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 "SMP/Common/vtkSMPToolsImpl.h"
#include "SMP/TBB/vtkSMPToolsImpl.txx"
#include <cstdlib> // For std::getenv()
#include <mutex> // For std::mutex
#include <stack> // For std::stack
#ifdef _MSC_VER
#pragma push_macro("__TBB_NO_IMPLICIT_LINKAGE")
#define __TBB_NO_IMPLICIT_LINKAGE 1
#endif
#include <tbb/task_arena.h> // For tbb:task_arena
#ifdef _MSC_VER
#pragma pop_macro("__TBB_NO_IMPLICIT_LINKAGE")
#endif
namespace vtk
{
namespace detail
{
namespace smp
{
VTK_ABI_NAMESPACE_BEGIN
static tbb::task_arena taskArena;
static std::mutex vtkSMPToolsCS;
static std::stack<int> threadIdStack;
static std::mutex threadIdStackLock;
//------------------------------------------------------------------------------
template <>
vtkSMPToolsImpl<BackendType::TBB>::vtkSMPToolsImpl()
: NestedActivated(true)
{
}
//------------------------------------------------------------------------------
template <>
void vtkSMPToolsImpl<BackendType::TBB>::Initialize(int numThreads)
{
vtkSMPToolsCS.lock();
if (numThreads == 0)
{
const char* vtkSmpNumThreads = std::getenv("VTK_SMP_MAX_THREADS");
if (vtkSmpNumThreads)
{
numThreads = std::atoi(vtkSmpNumThreads);
}
else if (taskArena.is_active())
{
taskArena.terminate();
}
}
if (numThreads > 0 && numThreads != taskArena.max_concurrency())
{
if (taskArena.is_active())
{
taskArena.terminate();
}
taskArena.initialize(numThreads);
}
vtkSMPToolsCS.unlock();
}
//------------------------------------------------------------------------------
template <>
int vtkSMPToolsImpl<BackendType::TBB>::GetEstimatedNumberOfThreads()
{
return taskArena.max_concurrency();
}
//------------------------------------------------------------------------------
template <>
bool vtkSMPToolsImpl<BackendType::TBB>::GetSingleThread()
{
return threadIdStack.top() == tbb::this_task_arena::current_thread_index();
}
//------------------------------------------------------------------------------
void vtkSMPToolsImplForTBB(vtkIdType first, vtkIdType last, vtkIdType grain,
ExecuteFunctorPtrType functorExecuter, void* functor)
{
threadIdStackLock.lock();
threadIdStack.emplace(tbb::this_task_arena::current_thread_index());
threadIdStackLock.unlock();
if (taskArena.is_active())
{
taskArena.execute([&] { functorExecuter(functor, first, last, grain); });
}
else
{
functorExecuter(functor, first, last, grain);
}
threadIdStackLock.lock();
threadIdStack.pop();
threadIdStackLock.unlock();
}
VTK_ABI_NAMESPACE_END
} // namespace smp
} // namespace detail
} // namespace vtk
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