stream.hpp

/*
 * Copyright (c) 2023-2025, 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 <sys/types.h>
#include <cstdlib>
#include <tuple>
#include <utility>
 
#include <kvikio/shim/cuda.hpp>
 
namespace kvikio {
 
class StreamFuture {
 private:
  struct ArgByVal {
    std::size_t size;
    off_t file_offset;
    off_t devPtr_offset;
    ssize_t bytes_done;
  };
 
  void* _devPtr_base{nullptr};
  CUstream _stream{nullptr};
  ArgByVal* _val{nullptr};
  bool _stream_synchronized{false};
 
 public:
  StreamFuture() noexcept = default;
 
  StreamFuture(
    void* devPtr_base, std::size_t size, off_t file_offset, off_t devPtr_offset, CUstream stream);
 
  StreamFuture(const StreamFuture&)        = delete;
  StreamFuture& operator=(StreamFuture& o) = delete;
  StreamFuture(StreamFuture&& o) noexcept;
  StreamFuture& operator=(StreamFuture&& o) noexcept;
 
  std::tuple<void*, std::size_t*, off_t*, off_t*, ssize_t*, CUstream> get_args() const;
 
  std::size_t check_bytes_done();
 
  ~StreamFuture() noexcept;
};
 
}  // namespace kvikio