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84 lines
2.8 KiB
84 lines
2.8 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 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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