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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
// .NAME vtkSMPThreadLocal - A simple thread local implementation for sequential operations.
// .SECTION Description
//
// Note that this particular implementation is designed to work in sequential
// mode and supports only 1 thread.
#ifndef SequentialvtkSMPThreadLocalImpl_h
#define SequentialvtkSMPThreadLocalImpl_h
#include "SMP/Common/vtkSMPThreadLocalImplAbstract.h"
#include "vtkSystemIncludes.h"
#include <iterator>
#include <utility> // For std::move
#include <vector>
namespace vtk
{
namespace detail
{
namespace smp
{
VTK_ABI_NAMESPACE_BEGIN
template <typename T>
class vtkSMPThreadLocalImpl<BackendType::Sequential, T> : public vtkSMPThreadLocalImplAbstract<T>
{
typedef std::vector<T> TLS;
typedef typename TLS::iterator TLSIter;
typedef typename vtkSMPThreadLocalImplAbstract<T>::ItImpl ItImplAbstract;
public:
vtkSMPThreadLocalImpl()
: NumInitialized(0)
{
this->Initialize();
}
explicit vtkSMPThreadLocalImpl(const T& exemplar)
: NumInitialized(0)
, Exemplar(exemplar)
{
this->Initialize();
}
T& Local() override
{
int tid = this->GetThreadID();
if (!this->Initialized[tid])
{
this->Internal[tid] = this->Exemplar;
this->Initialized[tid] = true;
++this->NumInitialized;
}
return this->Internal[tid];
}
size_t size() const override { return this->NumInitialized; }
class ItImpl : public vtkSMPThreadLocalImplAbstract<T>::ItImpl
{
public:
void Increment() override
{
this->InitIter++;
this->Iter++;
// Make sure to skip uninitialized
// entries.
while (this->InitIter != this->EndIter)
{
if (*this->InitIter)
{
break;
}
this->InitIter++;
this->Iter++;
}
}
bool Compare(ItImplAbstract* other) override
{
return this->Iter == static_cast<ItImpl*>(other)->Iter;
}
T& GetContent() override { return *this->Iter; }
T* GetContentPtr() override { return &*this->Iter; }
protected:
ItImpl* CloneImpl() const override { return new ItImpl(*this); };
private:
friend class vtkSMPThreadLocalImpl<BackendType::Sequential, T>;
std::vector<bool>::iterator InitIter;
std::vector<bool>::iterator EndIter;
TLSIter Iter;
};
std::unique_ptr<ItImplAbstract> begin() override
{
TLSIter iter = this->Internal.begin();
std::vector<bool>::iterator iter2 = this->Initialized.begin();
std::vector<bool>::iterator enditer = this->Initialized.end();
// fast forward to first initialized
// value
while (iter2 != enditer)
{
if (*iter2)
{
break;
}
iter2++;
iter++;
}
// XXX(c++14): use std::make_unique
auto retVal = std::unique_ptr<ItImpl>(new ItImpl());
retVal->InitIter = iter2;
retVal->EndIter = enditer;
retVal->Iter = iter;
// XXX(c++14): remove std::move and cast variable
std::unique_ptr<ItImplAbstract> abstractIt(std::move(retVal));
return abstractIt;
};
std::unique_ptr<ItImplAbstract> end() override
{
// XXX(c++14): use std::make_unique
auto retVal = std::unique_ptr<ItImpl>(new ItImpl());
retVal->InitIter = this->Initialized.end();
retVal->EndIter = this->Initialized.end();
retVal->Iter = this->Internal.end();
// XXX(c++14): remove std::move and cast variable
std::unique_ptr<ItImplAbstract> abstractIt(std::move(retVal));
return abstractIt;
}
private:
TLS Internal;
std::vector<bool> Initialized;
size_t NumInitialized;
T Exemplar;
void Initialize()
{
this->Internal.resize(this->GetNumberOfThreads());
this->Initialized.resize(this->GetNumberOfThreads());
std::fill(this->Initialized.begin(), this->Initialized.end(), false);
}
inline int GetNumberOfThreads() { return 1; }
inline int GetThreadID() { return 0; }
// disable copying
vtkSMPThreadLocalImpl(const vtkSMPThreadLocalImpl&) = delete;
void operator=(const vtkSMPThreadLocalImpl&) = delete;
};
VTK_ABI_NAMESPACE_END
} // namespace smp
} // namespace detail
} // namespace vtk
#endif
/* VTK-HeaderTest-Exclude: vtkSMPThreadLocalImpl.h */
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