host_memory_resource.hpp

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/*
 * Copyright (c) 2020-2025, 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 <rmm/detail/cuda_memory_resource.hpp>
#include <rmm/detail/export.hpp>
#include <rmm/detail/nvtx/ranges.hpp>
#include <rmm/resource_ref.hpp>
 
#include <cstddef>
 
namespace RMM_NAMESPACE {
namespace mr {
class host_memory_resource {
 public:
  host_memory_resource()                                = default;
  virtual ~host_memory_resource()                       = default;
  host_memory_resource(host_memory_resource const&)     = default;  
  host_memory_resource(host_memory_resource&&) noexcept = default;  
  host_memory_resource& operator=(host_memory_resource const&) =
    default;  
  host_memory_resource& operator=(host_memory_resource&&) noexcept =
    default;  
 
  void* allocate(std::size_t bytes, std::size_t alignment = alignof(std::max_align_t))
  {
    RMM_FUNC_RANGE();
    return do_allocate(bytes, alignment);
  }
 
  void deallocate(void* ptr,
                  std::size_t bytes,
                  std::size_t alignment = alignof(std::max_align_t)) noexcept
  {
    RMM_FUNC_RANGE();
    do_deallocate(ptr, bytes, alignment);
  }
 
  [[nodiscard]] bool is_equal(host_memory_resource const& other) const noexcept
  {
    return do_is_equal(other);
  }
 
  [[nodiscard]] bool operator==(host_memory_resource const& other) const noexcept
  {
    return do_is_equal(other);
  }
 
  [[nodiscard]] bool operator!=(host_memory_resource const& other) const noexcept
  {
    return !do_is_equal(other);
  }
 
  friend void get_property(host_memory_resource const&, cuda::mr::host_accessible) noexcept {}
 
 private:
  virtual void* do_allocate(std::size_t bytes,
                            std::size_t alignment = alignof(std::max_align_t)) = 0;
 
  virtual void do_deallocate(void* ptr,
                             std::size_t bytes,
                             std::size_t alignment = alignof(std::max_align_t)) noexcept = 0;
 
  [[nodiscard]] virtual bool do_is_equal(host_memory_resource const& other) const noexcept
  {
    return this == &other;
  }
 
#if CCCL_MAJOR_VERSION > 3 || (CCCL_MAJOR_VERSION == 3 && CCCL_MINOR_VERSION >= 1)
 
 public:
  void* allocate_sync(std::size_t bytes, std::size_t alignment)
  {
    return allocate(bytes, alignment);
  }
 
  void deallocate_sync(void* ptr, std::size_t bytes, std::size_t alignment)
  {
    return deallocate(ptr, bytes, alignment);
  }
 
#endif
};
 
// static property checks
static_assert(
  rmm::detail::polyfill::resource_with<host_memory_resource, cuda::mr::host_accessible>);
  // end of group
 
}  // namespace mr
}  // namespace RMM_NAMESPACE