/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 QUICKSTEP_THREADING_CPP11_CONDITION_VARIABLE_HPP_
#define QUICKSTEP_THREADING_CPP11_CONDITION_VARIABLE_HPP_

#include <chrono>
#include <cstdint>
#include <condition_variable>  // NOLINT(build/c++11)
#include <mutex>  // NOLINT(build/c++11)

#include "threading/ConditionVariable.hpp"
#include "utility/Macros.hpp"

namespace quickstep {

template <class InternalMutexType> class MutexImplCPP11;

/** \addtogroup Threading
 *  @{
 */

/**
 * @brief Implementation of ConditionVariable using C++11 threads.
 **/
template <typename InternalMutexType>
class ConditionVariableImplCPP11 {
 public:
  inline void await() {
    internal_condition_var_.wait(*parent_mutex_);
  }

  inline bool awaitWithTimeout(std::uint64_t milliseconds) {
    std::cv_status status = internal_condition_var_.wait_for(*parent_mutex_,
                                                             std::chrono::milliseconds(milliseconds));
    return std::cv_status::no_timeout == status;
  }

  inline void signalOne() {
    internal_condition_var_.notify_one();
  }

  inline void signalAll() {
    internal_condition_var_.notify_all();
  }

 private:
  explicit ConditionVariableImplCPP11(InternalMutexType *parent_mutex)
      : parent_mutex_(parent_mutex) {
  }

  InternalMutexType *parent_mutex_;
  std::condition_variable_any internal_condition_var_;

  friend class MutexImplCPP11<std::mutex>;
  friend class MutexImplCPP11<std::recursive_mutex>;

  DISALLOW_COPY_AND_ASSIGN(ConditionVariableImplCPP11);
};
typedef ConditionVariableImplCPP11<std::mutex> ConditionVariable;

/** @} */

}  // namespace quickstep

#endif  // QUICKSTEP_THREADING_CPP11_CONDITION_VARIABLE_HPP_