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85 lines
2.8 KiB
85 lines
2.8 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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#pragma once
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#include <thrust/detail/config.h>
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#include <thrust/detail/raw_pointer_cast.h>
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#include <thrust/detail/type_traits/pointer_traits.h>
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#include <thrust/detail/allocator/allocator_traits.h>
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#include <thrust/detail/util/blocking.h>
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#include <thrust/pair.h>
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namespace thrust
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{
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namespace detail
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{
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template<typename ToPointer, typename FromPointer>
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__host__ __device__
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ToPointer reinterpret_pointer_cast(FromPointer ptr)
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{
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typedef typename thrust::detail::pointer_element<ToPointer>::type to_element;
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return ToPointer(reinterpret_cast<to_element*>(thrust::raw_pointer_cast(ptr)));
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}
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template<typename Allocator, template <typename> class BaseSystem>
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struct execute_with_allocator
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: BaseSystem<execute_with_allocator<Allocator, BaseSystem> >
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{
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Allocator &m_alloc;
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execute_with_allocator(Allocator &alloc)
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: m_alloc(alloc)
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{}
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template<typename T>
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friend thrust::pair<T*,std::ptrdiff_t>
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get_temporary_buffer(execute_with_allocator &system, std::ptrdiff_t n)
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{
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typedef typename thrust::detail::allocator_traits<Allocator> alloc_traits;
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typedef typename alloc_traits::void_pointer void_pointer;
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typedef typename alloc_traits::size_type size_type;
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typedef typename alloc_traits::value_type value_type;
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// how many elements of type value_type do we need to accomodate n elements of type T?
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size_type num_elements = thrust::detail::util::divide_ri(sizeof(T) * n, sizeof(value_type));
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// allocate that many
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void_pointer ptr = alloc_traits::allocate(system.m_alloc, num_elements);
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// return the pointer and the number of elements of type T allocated
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return thrust::make_pair(thrust::detail::reinterpret_pointer_cast<T*>(ptr),n);
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}
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template<typename Pointer>
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friend void return_temporary_buffer(execute_with_allocator &system, Pointer p)
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{
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typedef typename thrust::detail::allocator_traits<Allocator> alloc_traits;
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typedef typename alloc_traits::pointer pointer;
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// return the pointer to the allocator
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pointer to_ptr = thrust::detail::reinterpret_pointer_cast<pointer>(p);
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alloc_traits::deallocate(system.m_alloc, to_ptr, 0);
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}
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};
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} // end detail
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} // end thrust
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