You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
2.8 KiB
84 lines
2.8 KiB
/* |
|
* Copyright 2008-2012 NVIDIA Corporation |
|
* |
|
* Licensed under the Apache License, Version 2.0 (the "License"); |
|
* you may not use this file except in compliance with the License. |
|
* You may obtain a copy of the License at |
|
* |
|
* http://www.apache.org/licenses/LICENSE-2.0 |
|
* |
|
* Unless required by applicable law or agreed to in writing, software |
|
* distributed under the License is distributed on an "AS IS" BASIS, |
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
|
* See the License for the specific language governing permissions and |
|
* limitations under the License. |
|
*/ |
|
|
|
#pragma once |
|
|
|
#include <thrust/detail/config.h> |
|
#include <thrust/detail/raw_pointer_cast.h> |
|
#include <thrust/detail/type_traits/pointer_traits.h> |
|
#include <thrust/detail/allocator/allocator_traits.h> |
|
#include <thrust/detail/util/blocking.h> |
|
#include <thrust/pair.h> |
|
|
|
namespace thrust |
|
{ |
|
namespace detail |
|
{ |
|
|
|
template<typename ToPointer, typename FromPointer> |
|
__host__ __device__ |
|
ToPointer reinterpret_pointer_cast(FromPointer ptr) |
|
{ |
|
typedef typename thrust::detail::pointer_element<ToPointer>::type to_element; |
|
return ToPointer(reinterpret_cast<to_element*>(thrust::raw_pointer_cast(ptr))); |
|
} |
|
|
|
|
|
template<typename Allocator, template <typename> class BaseSystem> |
|
struct execute_with_allocator |
|
: BaseSystem<execute_with_allocator<Allocator, BaseSystem> > |
|
{ |
|
Allocator &m_alloc; |
|
|
|
execute_with_allocator(Allocator &alloc) |
|
: m_alloc(alloc) |
|
{} |
|
|
|
template<typename T> |
|
friend thrust::pair<T*,std::ptrdiff_t> |
|
get_temporary_buffer(execute_with_allocator &system, std::ptrdiff_t n) |
|
{ |
|
typedef typename thrust::detail::allocator_traits<Allocator> alloc_traits; |
|
typedef typename alloc_traits::void_pointer void_pointer; |
|
typedef typename alloc_traits::size_type size_type; |
|
typedef typename alloc_traits::value_type value_type; |
|
|
|
// how many elements of type value_type do we need to accomodate n elements of type T? |
|
size_type num_elements = thrust::detail::util::divide_ri(sizeof(T) * n, sizeof(value_type)); |
|
|
|
// allocate that many |
|
void_pointer ptr = alloc_traits::allocate(system.m_alloc, num_elements); |
|
|
|
// return the pointer and the number of elements of type T allocated |
|
return thrust::make_pair(thrust::detail::reinterpret_pointer_cast<T*>(ptr),n); |
|
} |
|
|
|
template<typename Pointer> |
|
friend void return_temporary_buffer(execute_with_allocator &system, Pointer p) |
|
{ |
|
typedef typename thrust::detail::allocator_traits<Allocator> alloc_traits; |
|
typedef typename alloc_traits::pointer pointer; |
|
|
|
// return the pointer to the allocator |
|
pointer to_ptr = thrust::detail::reinterpret_pointer_cast<pointer>(p); |
|
alloc_traits::deallocate(system.m_alloc, to_ptr, 0); |
|
} |
|
}; |
|
|
|
|
|
} // end detail |
|
} // end thrust |
|
|
|
|