/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2018 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#include "Semaphore.h"


namespace OrthancWSI
{
  Semaphore::Semaphore(unsigned int count) : count_(count)
  {
  }

  void Semaphore::Release()
  {
    boost::mutex::scoped_lock lock(mutex_);

    count_++;
    condition_.notify_one(); 
  }

  void Semaphore::Acquire()
  {
    boost::mutex::scoped_lock lock(mutex_);

    while (count_ == 0)
    {
      condition_.wait(lock);
    }

    count_++;
  }
}