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98 lines
3.4 KiB
98 lines
3.4 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 compliance 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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/*! \file for_each.inl
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* \brief Inline file for for_each.h.
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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/detail/function.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/for_each.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 omp
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{
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namespace detail
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{
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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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// we're attempting to launch an omp kernel, assert we're compiling with omp support
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// ========================================================================
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// X Note to the user: If you've found this line due to a compiler error, X
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// X you need to enable OpenMP support in your compiler. X
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// ========================================================================
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THRUST_STATIC_ASSERT( (thrust::detail::depend_on_instantiation<RandomAccessIterator,
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(THRUST_DEVICE_COMPILER_IS_OMP_CAPABLE == THRUST_TRUE)>::value) );
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if (n <= 0) return first; //empty range
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// create a wrapped function for f
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typedef typename thrust::iterator_reference<RandomAccessIterator>::type reference;
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thrust::detail::host_function<UnaryFunction,void> wrapped_f(f);
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// do not attempt to compile the body of this function, which depends on #pragma omp,
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// without support from the compiler
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// XXX implement the body of this function in another file to eliminate this ugliness
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#if (THRUST_DEVICE_COMPILER_IS_OMP_CAPABLE == THRUST_TRUE)
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// use a signed type for the iteration variable or suffer the consequences of warnings
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typedef typename thrust::iterator_difference<RandomAccessIterator>::type DifferenceType;
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DifferenceType signed_n = n;
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#pragma omp parallel for
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for(DifferenceType i = 0;
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i < signed_n;
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++i)
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{
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RandomAccessIterator temp = first + i;
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wrapped_f(*temp);
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}
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#endif // THRUST_DEVICE_COMPILER_IS_OMP_CAPABLE
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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 omp::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 omp
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} // end namespace system
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} // end namespace thrust
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