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/******************************************************************************
* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the NVIDIA CORPORATION nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************/
#pragma once
#include <thrust/detail/config.h>
#if THRUST_DEVICE_COMPILER == THRUST_DEVICE_COMPILER_NVCC
#include <iterator>
#include <thrust/system/cuda/config.h>
#include <thrust/system/cuda/detail/util.h>
#include <thrust/system/cuda/detail/parallel_for.h>
#include <thrust/detail/function.h>
#include <thrust/distance.h>
THRUST_NAMESPACE_BEGIN
namespace cuda_cub {
// for_each functor
template <class Input, class UnaryOp>
struct for_each_f
{
Input input;
UnaryOp op;
THRUST_FUNCTION
for_each_f(Input input, UnaryOp op)
: input(input), op(op) {}
template <class Size>
THRUST_DEVICE_FUNCTION void operator()(Size idx)
{
op(raw_reference_cast(input[idx]));
}
};
//-------------------------
// Thrust API entry points
//-------------------------
// for_each_n
template <class Derived,
class Input,
class Size,
class UnaryOp>
Input THRUST_FUNCTION
for_each_n(execution_policy<Derived> &policy,
Input first,
Size count,
UnaryOp op)
{
typedef thrust::detail::wrapped_function<UnaryOp, void> wrapped_t;
wrapped_t wrapped_op(op);
cuda_cub::parallel_for(policy,
for_each_f<Input, wrapped_t>(first, wrapped_op),
count);
cuda_cub::throw_on_error(
cuda_cub::synchronize_optional(policy)
, "for_each: failed to synchronize"
);
return first + count;
}
// for_each
template <class Derived,
class Input,
class UnaryOp>
Input THRUST_FUNCTION
for_each(execution_policy<Derived> &policy,
Input first,
Input last,
UnaryOp op)
{
typedef typename iterator_traits<Input>::difference_type size_type;
size_type count = static_cast<size_type>(thrust::distance(first,last));
return cuda_cub::for_each_n(policy, first, count, op);
}
} // namespace cuda_cub
THRUST_NAMESPACE_END
#endif
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