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100 lines
2.9 KiB
100 lines
2.9 KiB
/* |
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* Copyright 2008-2012 NVIDIA Corporation |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in ctbbliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#include <thrust/detail/config.h> |
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#include <thrust/detail/static_assert.h> |
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#include <thrust/distance.h> |
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#include <thrust/iterator/iterator_traits.h> |
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#include <thrust/distance.h> |
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#include <thrust/system/detail/internal/scalar/for_each.h> |
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#include <tbb/blocked_range.h> |
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#include <tbb/parallel_for.h> |
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namespace thrust |
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{ |
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namespace system |
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{ |
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namespace tbb |
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{ |
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namespace detail |
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{ |
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namespace for_each_detail |
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{ |
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template<typename RandomAccessIterator, |
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typename Size, |
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typename UnaryFunction> |
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struct body |
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{ |
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RandomAccessIterator m_first; |
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UnaryFunction m_f; |
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body(RandomAccessIterator first, UnaryFunction f) |
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: m_first(first), m_f(f) |
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{} |
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void operator()(const ::tbb::blocked_range<Size> &r) const |
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{ |
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// we assume that blocked_range specifies a contiguous range of integers |
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thrust::system::detail::internal::scalar::for_each_n(m_first + r.begin(), r.size(), m_f); |
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} // end operator()() |
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}; // end body |
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template<typename Size, typename RandomAccessIterator, typename UnaryFunction> |
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body<RandomAccessIterator,Size,UnaryFunction> |
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make_body(RandomAccessIterator first, UnaryFunction f) |
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{ |
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return body<RandomAccessIterator,Size,UnaryFunction>(first, f); |
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} // end make_body() |
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} // end for_each_detail |
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template<typename DerivedPolicy, |
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typename RandomAccessIterator, |
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typename Size, |
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typename UnaryFunction> |
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RandomAccessIterator for_each_n(execution_policy<DerivedPolicy> &, |
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RandomAccessIterator first, |
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Size n, |
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UnaryFunction f) |
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{ |
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::tbb::parallel_for(::tbb::blocked_range<Size>(0,n), for_each_detail::make_body<Size>(first,f)); |
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// return the end of the range |
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return first + n; |
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} // end for_each_n |
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template<typename DerivedPolicy, |
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typename RandomAccessIterator, |
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typename UnaryFunction> |
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RandomAccessIterator for_each(execution_policy<DerivedPolicy> &s, |
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RandomAccessIterator first, |
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RandomAccessIterator last, |
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UnaryFunction f) |
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{ |
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return tbb::detail::for_each_n(s, first, thrust::distance(first,last), f); |
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} // end for_each() |
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} // end namespace detail |
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} // end namespace tbb |
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} // end namespace system |
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} // end namespace thrust |
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