failure_callback_resource_adaptor.hpp

转到此文件的文档。

/*
 * Copyright (c) 2020-2024, 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
 *
 * https://apache.ac.cn/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/error.hpp>
#include <rmm/detail/export.hpp>
#include <rmm/mr/device/device_memory_resource.hpp>
#include <rmm/mr/device/per_device_resource.hpp>
#include <rmm/resource_ref.hpp>

#include <cstddef>
#include <functional>
#include <utility>

namespace RMM_NAMESPACE {
namespace mr {
using failure_callback_t = std::function<bool(std::size_t, void*)>;

template <typename Upstream, typename ExceptionType = rmm::out_of_memory>
class failure_callback_resource_adaptor final : public device_memory_resource {
 public
 using exception_type = ExceptionType;

 failure_callback_resource_adaptor(device_async_resource_ref upstream,
 failure_callback_t callback,
 void* callback_arg)
 : upstream_{upstream}, callback_{std::move(callback)}, callback_arg_{callback_arg}
 {
 }

 failure_callback_resource_adaptor(Upstream* upstream,
 failure_callback_t callback,
 void* callback_arg)
 : upstream_{to_device_async_resource_ref_checked(upstream)},
 callback_{std::move(callback)},
 callback_arg_{callback_arg}
 {
 }

 failure_callback_resource_adaptor() = delete;
 ~failure_callback_resource_adaptor() override = default;
 failure_callback_resource_adaptor(failure_callback_resource_adaptor const&) = delete;
 failure_callback_resource_adaptor& operator=(failure_callback_resource_adaptor const&) = delete;
 failure_callback_resource_adaptor(failure_callback_resource_adaptor&&) noexcept =
 default;
 failure_callback_resource_adaptor& operator=(failure_callback_resource_adaptor&&) noexcept =
 default;

 [[nodiscard]] rmm::device_async_resource_ref get_upstream_resource() const noexcept
 {
 return upstream_;
 }

 private
 void* do_allocate(std::size_t bytes, cuda_stream_view stream) override
 {
 void* ret{};

 while (true) {
 try {
 ret = get_upstream_resource().allocate_async(bytes, stream);
 break;
 } catch (exception_type const& e) {
 if (!callback_(bytes, callback_arg_)) { throw; }
 }
 }
 return ret;
 }

 void do_deallocate(void* ptr, std::size_t bytes, cuda_stream_view stream) override
 {
 get_upstream_resource().deallocate_async(ptr, bytes, stream);
 }

 [[nodiscard]] bool do_is_equal(device_memory_resource const& other) const noexcept override
 {
 if (this == &other) { return true; }
 auto cast = dynamic_cast<failure_callback_resource_adaptor<Upstream> const*>(&other);
 if (cast == nullptr) { return false; }
 return get_upstream_resource() == cast->get_upstream_resource();
 }

 // 用于满足分配请求的上游资源
 device_async_resource_ref upstream_;
 failure_callback_t callback_;
 void* callback_arg_;
};
 // 组结束
} // namespace mr
} // namespace RMM_NAMESPACE