SharedMem.h

#ifndef SHAREDMEM_H
#define SHAREDMEM_H
//+
// File : sharedmem.h
// Description : shared memory library for communication among processes
//
// Author : Ryosuke Itoh, IPNS, KEK
// Date : 11 - Dec - 2002
//-
 
#include <sys/types.h>
 
#include <string>
 
namespace Belle2 {
  class SharedMem {
  public:
    SharedMem(const char* name, int size);
    SharedMem(int shm_id);
    SharedMem(int shm_id, int sem_id, int size);
    ~SharedMem(void);
 
    void* ptr(void);
    int shmid(void);
 
    bool IsCreated(void);
 
    void lock();
    void unlock();
    bool isLocked();
 
  private:
    bool m_new; 
    bool m_file;
    std::string m_pathname;
    int  m_pathfd; 
    key_t m_shmkey; 
    key_t m_semkey; 
    int m_shmid;
    int m_semid;
    void* m_shmadr;
    int m_shmsize;
    char* m_strbuf;
  };
}
 
#endif