DqmSharedMem.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
#pragma once
 
#include <sys/types.h>
 
#include <string>
 
namespace Belle2 {
  class DqmSharedMem {
  public:
    DqmSharedMem(const char* name, int size);
    DqmSharedMem(int shm_id, int sem_id, int size);
    ~DqmSharedMem(void);
 
    void* ptr(void);
    int shmid(void);
 
    bool IsCreated(void);
 
    static std::string getTmpFileName(std::string user, std::string name);
    static bool getIdFromTmpFileName(std::string filename, int& shmid, int& semid);
 
    void lock(void);
    void unlock(void);
    bool isLocked(void);
 
  private:
    bool m_new{false}; 
    int  m_pathfd; 
    key_t m_shmkey; 
    key_t m_semkey; 
    int m_shmid{-1}; 
    int m_semid{-1}; 
    void* m_shmadr{nullptr};
  };
}