itkBarrier.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  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.txt
 *
 *  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 itkBarrier_h
#define itkBarrier_h

#include "itkLightObject.h"
#include "itkObjectFactory.h"
#include <condition_variable>
#include <mutex>

namespace itk
{
class ITKCommon_EXPORT Barrier
  : public LightObject
{
public:

  using Self = Barrier;
  using Superclass = LightObject;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkNewMacro(Self);

  itkTypeMacro(Barrier, LightObject);

  void Initialize(unsigned int);

  void Wait();

private:
  Barrier();
  ~Barrier() override;

  unsigned int            m_NumberArrived{0};
  unsigned int            m_NumberExpected{0};
  unsigned int            m_Generation{0}; // Allows successive waits
  std::condition_variable m_ConditionVariable;
  std::mutex              m_Mutex;
};
} // end namespace itk

#endif