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/*
* Copyright 2008-2013 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>
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
#include <thrust/detail/cpp11_required.h>
#if THRUST_CPP_DIALECT >= 2011
#include <thrust/system/detail/generic/per_device_resource.h>
#include <thrust/system/detail/adl/per_device_resource.h>
#include <thrust/mr/allocator.h>
#include <thrust/detail/execution_policy.h>
#include <thrust/mr/allocator.h>
THRUST_NAMESPACE_BEGIN
/*! Returns a global instance of \p MR for the current device of the provided system.
*
* \tparam MR type of a memory resource to get an instance from. Must be \p DefaultConstructible.
* \param system execution policy for which the resource is requested.
* \return a pointer to a global instance of \p MR for the current device.
*/
template<typename MR, typename DerivedPolicy>
__host__
MR * get_per_device_resource(const thrust::detail::execution_policy_base<DerivedPolicy> & system)
{
using thrust::system::detail::generic::get_per_device_resource;
return get_per_device_resource<MR>(
thrust::detail::derived_cast(
thrust::detail::strip_const(system)));
}
/*! A helper allocator class that uses global per device instances of a given upstream memory resource. Requires the memory
* resource to be default constructible.
*
* \tparam T the type that will be allocated by this allocator.
* \tparam MR the upstream memory resource to use for memory allocation. Must derive from
* \p thrust::mr::memory_resource and must be \p final.
* \tparam ExecutionPolicy the execution policy of the system to be used to retrieve the resource for the current device.
*/
template<typename T, typename Upstream, typename ExecutionPolicy>
class per_device_allocator : public thrust::mr::allocator<T, Upstream>
{
typedef thrust::mr::allocator<T, Upstream> base;
public:
/*! The \p rebind metafunction provides the type of an \p per_device_allocator instantiated with another type.
*
* \tparam U the other type to use for instantiation.
*/
template<typename U>
struct rebind
{
/*! The typedef \p other gives the type of the rebound \p per_device_allocator.
*/
typedef per_device_allocator<U, Upstream, ExecutionPolicy> other;
};
/*! Default constructor. Uses \p get_global_resource to get the global instance of \p Upstream and initializes the
* \p allocator base subobject with that resource.
*/
__host__
per_device_allocator() : base(get_per_device_resource<Upstream>(ExecutionPolicy()))
{
}
/*! Copy constructor. Copies the memory resource pointer. */
__host__ __device__
per_device_allocator(const per_device_allocator & other)
: base(other) {}
/*! Conversion constructor from an allocator of a different type. Copies the memory resource pointer. */
template<typename U>
__host__ __device__
per_device_allocator(const per_device_allocator<U, Upstream, ExecutionPolicy> & other)
: base(other) {}
/*! Destructor. */
__host__ __device__
~per_device_allocator() {}
};
THRUST_NAMESPACE_END
#endif // THRUST_CPP_DIALECT >= 2011
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