SharedEventBuffer.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.                  *
 **************************************************************************/
#ifndef Belle2_SharedEventBuffer_h
#define Belle2_SharedEventBuffer_h
 
#include "daq/slc/system/SharedMemory.h"
#include "daq/slc/system/MMutex.h"
#include "daq/slc/system/MCond.h"
 
namespace Belle2 {
 
  class SharedEventBuffer {
 
  public:
    struct Header {
      unsigned int expno;
      unsigned int runno;
      unsigned int subno;
      unsigned int count_in;
      unsigned int count_out;
      unsigned long long nword_in;
      unsigned long long nword_out;
      unsigned short nwriter;
      unsigned short nreader;
    };
 
  public:
    SharedEventBuffer()
    {
      m_buf = NULL;
      m_nword = 0;
    }
    ~SharedEventBuffer()
    {
      if (m_buf != NULL) m_memory.close();
    }
 
  public:
    size_t size() throw();
    bool open(const std::string& nodename,
              size_t nword, bool recreate = false);
    bool init();
    bool close();
    bool unlink();
    bool lock() throw();
    bool unlock() throw();
    bool wait() throw();
    bool wait(int time) throw();
    bool notify() throw();
    void clear();
    bool isOpened() { return m_memory.isOpened(); }
 
  public:
    const std::string getPath() const throw() { return m_path; }
    Header* getHeader() throw() { return m_header; }
    int* getBuffer() throw() { return m_buf; }
    bool isWritable(int nword) throw();
    bool isReadable(int nword) throw();
    unsigned int write(const int* buf, unsigned int nword,
                       bool fouce, unsigned int serial = 0)
    {
      return write(buf, nword, fouce, serial, false);
    }
    unsigned int write(const int* buf, unsigned int nword,
                       bool fouce, unsigned int serial, bool unlocked);
    unsigned int read(int* buf, bool fouce, bool unlocked, Header* hdr = NULL);
 
  private:
    std::string m_path;
    SharedMemory m_memory;
    MMutex m_mutex;
    MCond m_cond;
    Header* m_header;
    int* m_buf;
    unsigned int m_nword;
 
  };

}
 
#endif