task_queue.hpp

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// Copyright 2015 TIER IV, Inc. All rights reserved.
//
// 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.
 
#ifndef CONCEALER__TASK_QUEUE_HPP_
#define CONCEALER__TASK_QUEUE_HPP_
 
#include <atomic>
#include <exception>
#include <functional>
#include <mutex>
#include <queue>
#include <thread>
 
namespace concealer
{
class TaskQueue
{
  using Thunk = std::function<void()>;
 
  std::queue<Thunk> thunks;
 
  mutable std::mutex thunks_mutex;
 
  std::thread dispatcher;
 
  std::atomic<bool> finalized = false;
 
  std::exception_ptr thrown;
 
  auto front() const -> Thunk;
 
  auto pop() -> void;
 
public:
  explicit TaskQueue();
 
  ~TaskQueue();
 
  template <typename F>
  auto delay(F && f) -> void
  {
    rethrow();
    auto lock = std::unique_lock(thunks_mutex);
    thunks.emplace(std::forward<F>(f));
  }
 
  auto empty() const -> bool;
 
  auto rethrow() const -> void;
};
}  // namespace concealer
 
#endif  // CONCEALER__TASK_QUEUE_HPP_