deeplearning4j/deeplearning4j

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libnd4j/include/execution/impl/BlockingQueue.cpp

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/* ******************************************************************************
 *
 *
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 which is available at
 * https://www.apache.org/licenses/LICENSE-2.0.
 *
 *  See the NOTICE file distributed with this work for additional
 *  information regarding copyright ownership.
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 ******************************************************************************/

//
// @author raver119@gmail.com
//
#include <execution/BlockingQueue.h>
#include <execution/CallableWithArguments.h>

#include <thread>

namespace samediff {
template <typename T>
BlockingQueue<T>::BlockingQueue(int queueSize) {
  _size = 0;
  _available = true;
}

template <typename T>
T BlockingQueue<T>::poll() {
  // locking untill there's something within queue
  std::unique_lock<std::mutex> lock(_lock);
  _condition.wait(lock, [&] { return this->_size.load() != 0; });

  T t(std::move(_queue.front()));
  _queue.pop();
  _size--;
  return t;
}

template <typename T>
void BlockingQueue<T>::put(const T &t) {
  {
    // locking before push, unlocking after
    std::unique_lock<std::mutex> lock(_lock);
    _queue.push(t);
    _size++;
  }

  // notifying condition
  _condition.notify_one();
}

template <typename T>
bool BlockingQueue<T>::available() {
  return _available.load();
}

template <typename T>
void BlockingQueue<T>::markAvailable() {
  _available = true;
}

template <typename T>
void BlockingQueue<T>::markUnavailable() {
  _available = false;
}

template class BlockingQueue<CallableWithArguments *>;
}  // namespace samediff