OHLockedHist.h

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/*
  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef AthenaMonitoringKernel_OHLockedHist_h
#define AthenaMonitoringKernel_OHLockedHist_h

 
#include "CxxUtils/checker_macros.h"
 
#include <mutex>

class oh_lock_histogram_mutex {
public:
  oh_lock_histogram_mutex() = default;
  ~oh_lock_histogram_mutex() = default;

  static void set_histogram_mutex(std::mutex& mutex) { m_mutex = &mutex; }

  static void reset_histogram_mutex() { m_mutex = nullptr; }
 
  // no copy
  oh_lock_histogram_mutex(const oh_lock_histogram_mutex&) = delete;
  oh_lock_histogram_mutex& operator=(const oh_lock_histogram_mutex&) = delete;
 
protected:
  static std::mutex* m_mutex ATLAS_THREAD_SAFE;
};

template <class H>
class oh_lock_histogram : public oh_lock_histogram_mutex {
public:
  oh_lock_histogram(H* h) : m_hist(h)
  {
    if (m_mutex) m_mutex->lock();
  }

  H* operator->() { return m_hist; }

  ~oh_lock_histogram()
  {
    if (m_mutex) m_mutex->unlock();
  }
 
private:
  void* operator new(size_t);
 
  H* m_hist;
};

class oh_scoped_lock_histogram : public oh_lock_histogram_mutex {
public:
  oh_scoped_lock_histogram()
  {
    if (m_mutex) m_mutex->lock();
  }

  ~oh_scoped_lock_histogram()
  {
    if (m_mutex) m_mutex->unlock();
  }
 
private:
  void* operator new(size_t);
};
 
#endif