mirror of
https://gitlab.kitware.com/vtk/vtk-m
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93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2015 Sandia Corporation.
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// Copyright 2015 UT-Battelle, LLC.
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// Copyright 2015 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_exec_AtomicArray_h
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#define vtk_m_exec_AtomicArray_h
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#include <vtkm/ListTag.h>
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#include <vtkm/cont/DeviceAdapter.h>
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/exec/ExecutionObjectBase.h>
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namespace vtkm {
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namespace exec {
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/// \brief A type list containing types that can be used with an AtomicArray.
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///
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struct AtomicArrayTypeListTag : vtkm::ListTagBase<vtkm::Int32,vtkm::Int64> { };
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/// A class that can be used to atomically operate on an array of values safely
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/// across multiple instances of the same worklet. This is useful when you have
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/// an algorithm that needs to accumulate values in parallel, but writing out a
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/// value per worklet might be memory prohibitive.
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///
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/// To construct an AtomicArray you will need to pass in an
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/// vtkm::cont::ArrayHandle that is used as the underlying storage for the
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/// AtomicArray
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///
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/// Supported Operations: add / compare and swap (CAS)
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///
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/// Supported Types: 32 / 64 bit signed integers
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///
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///
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template<typename T, typename DeviceAdapterTag>
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class AtomicArray : public vtkm::exec::ExecutionObjectBase
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{
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public:
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typedef T ValueType;
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VTKM_CONT_EXPORT
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AtomicArray()
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: AtomicImplementation(vtkm::cont::make_ArrayHandle((T*)NULL, 0))
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{ }
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template<typename StorageType>
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VTKM_CONT_EXPORT
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AtomicArray(vtkm::cont::ArrayHandle<T, StorageType> handle):
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AtomicImplementation( handle )
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{
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}
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VTKM_EXEC_EXPORT
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T Add(vtkm::Id index, const T& value) const
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{
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return this->AtomicImplementation.Add(index,value);
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}
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//
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// Compare and Swap is an atomic exchange operation. If the value at
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// the index is equal to oldValue, then newValue is written to the index.
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// The operation was successful if return value is equal to oldValue
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//
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VTKM_EXEC_EXPORT
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T CompareAndSwap(vtkm::Id index, const T& newValue, const T& oldValue) const
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{
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return this->AtomicImplementation.CompareAndSwap(index,newValue, oldValue);
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}
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private:
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vtkm::cont::DeviceAdapterAtomicArrayImplementation<T,DeviceAdapterTag>
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AtomicImplementation;
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};
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}
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} // namespace vtkm::exec
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#endif //vtk_m_exec_AtomicArray_h
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