device_memory_resource.hpp

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/*
 * SPDX-FileCopyrightText: Copyright (c) 2019-2026, NVIDIA CORPORATION.
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once
 
#include <rmm/cuda_stream_view.hpp>
#include <rmm/detail/aligned.hpp>
#include <rmm/detail/error.hpp>
#include <rmm/detail/export.hpp>
#include <rmm/detail/nvtx/ranges.hpp>
 
#include <cuda/memory_resource>
 
#include <cstddef>
#include <memory>
 
namespace RMM_NAMESPACE {
namespace mr {
class device_memory_resource {
 public:
  device_memory_resource()                              = default;
  virtual ~device_memory_resource()                     = default;
  device_memory_resource(device_memory_resource const&) = default;  
  device_memory_resource(device_memory_resource&&) noexcept =
    default;  
  device_memory_resource& operator=(device_memory_resource const&) =
    default;  
  device_memory_resource& operator=(device_memory_resource&&) noexcept =
    default;  
 
  void* allocate_sync(std::size_t bytes, std::size_t alignment = rmm::CUDA_ALLOCATION_ALIGNMENT)
  {
    RMM_EXPECTS(
      alignment <= rmm::CUDA_ALLOCATION_ALIGNMENT && rmm::is_supported_alignment(alignment),
      "Alignment must be less than or equal to 256 and a power of two",
      rmm::bad_alloc);
    auto const stream = cuda_stream_view{};
    void* ptr         = do_allocate(bytes, stream);
    stream.synchronize();
    return ptr;
  }
 
  void deallocate_sync(
    void* ptr,
    std::size_t bytes,
    [[maybe_unused]] std::size_t alignment = rmm::CUDA_ALLOCATION_ALIGNMENT) noexcept
  {
    do_deallocate(ptr, bytes, cuda_stream_view{});
  }
 
  void* allocate(cuda_stream_view stream,
                 std::size_t bytes,
                 std::size_t alignment = rmm::CUDA_ALLOCATION_ALIGNMENT)
  {
    RMM_EXPECTS(
      alignment <= rmm::CUDA_ALLOCATION_ALIGNMENT && rmm::is_supported_alignment(alignment),
      "Alignment must be less than or equal to 256 and a power of two",
      rmm::bad_alloc);
    return do_allocate(bytes, stream);
  }
 
  void deallocate(cuda_stream_view stream,
                  void* ptr,
                  std::size_t bytes,
                  [[maybe_unused]] std::size_t alignment = rmm::CUDA_ALLOCATION_ALIGNMENT) noexcept
  {
    do_deallocate(ptr, bytes, stream);
  }
 
  [[nodiscard]] bool is_equal(device_memory_resource const& other) const noexcept
  {
    return do_is_equal(other);
  }
 
  [[nodiscard]] bool operator==(device_memory_resource const& other) const noexcept
  {
    return do_is_equal(other);
  }
 
  [[nodiscard]] bool operator!=(device_memory_resource const& other) const noexcept
  {
    return !do_is_equal(other);
  }
 
  friend void get_property(device_memory_resource const&, cuda::mr::device_accessible) noexcept {}
 
 private:
  virtual void* do_allocate(std::size_t bytes, cuda_stream_view stream) = 0;
 
  virtual void do_deallocate(void* ptr, std::size_t bytes, cuda_stream_view stream) noexcept = 0;
 
  [[nodiscard]] virtual bool do_is_equal(device_memory_resource const& other) const noexcept
  {
    return this == std::addressof(other);
  }
};
 
// static property checks
static_assert(cuda::mr::synchronous_resource<device_memory_resource>);
static_assert(cuda::mr::resource<device_memory_resource>);
static_assert(
  cuda::mr::synchronous_resource_with<device_memory_resource, cuda::mr::device_accessible>);
static_assert(cuda::mr::resource_with<device_memory_resource, cuda::mr::device_accessible>);
  // end of group
}  // namespace mr
}  // namespace RMM_NAMESPACE