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101 lines
2.9 KiB
101 lines
2.9 KiB
11 years ago
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/*
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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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