callback_memory_resource.hpp

/*
 * SPDX-FileCopyrightText: Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once
 
#include <rmm/detail/export.hpp>
#include <rmm/mr/detail/callback_memory_resource_impl.hpp>
#include <rmm/resource_ref.hpp>
 
#include <cuda/memory_resource>
#include <cuda/stream>
 
#include <cstddef>
#include <functional>
 
RMM_NAMESPACE_BEGIN
namespace mr {

using allocate_callback_t = std::function<void*(cuda::stream_ref, std::size_t, std::size_t, void*)>;

using deallocate_callback_t =
  std::function<void(cuda::stream_ref, void*, std::size_t, std::size_t, void*)>;
 
namespace detail {
class callback_memory_resource_impl;
}

class RMM_EXPORT callback_memory_resource
  : public cuda::mr::shared_resource<detail::callback_memory_resource_impl> {
  using shared_base = cuda::mr::shared_resource<detail::callback_memory_resource_impl>;
 
 public:
  RMM_CONSTEXPR_FRIEND void get_property(callback_memory_resource const&,
                                         cuda::mr::device_accessible) noexcept
  {
  }

  callback_memory_resource(allocate_callback_t allocate_callback,
                           deallocate_callback_t deallocate_callback,
                           void* allocate_callback_arg   = nullptr,
                           void* deallocate_callback_arg = nullptr);
 
  callback_memory_resource()  = delete;
  ~callback_memory_resource() = default;
};
 
static_assert(cuda::mr::resource_with<callback_memory_resource, cuda::mr::device_accessible>,
              "callback_memory_resource does not satisfy the cuda::mr::resource concept");
  // end of group
}  // namespace mr
RMM_NAMESPACE_END