ngcdcsSHM.hpp

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#ifndef ngcdcsSHM_H
#define ngcdcsSHM_H
 
 
#ifndef __cplusplus
#error This is a C++ include file and cannot be used from plain C
#endif
 
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/shm.h>
 
#include <ngc/core/ngcb.h>
#include <ngc/core/ngcdcsFINFO.hpp>

#define ngcdcsSHM_NAME_DEFAULT "NGC"

#define ngcdcsSHM_NUM_BUF 2
 

class ngcdcsSHM {
public:
  char name[64];

  char type[64];

  void *spare;

  ngcdcsSHM();

  explicit ngcdcsSHM(FILE *wd);

  ngcdcsSHM(FILE *wd, int n);

  ngcdcsSHM(FILE *wd, const char *s);      

  ngcdcsSHM(FILE *wd, const char *s, int n);      
 
  // Destructor 
  virtual ~ngcdcsSHM();     

  int Initialized() {return (initialized_);}
  
  char *ErrMsg() {return (erms_);}

  int NumBuf(int n);

  int NumBuf() {return (numBuf_);}

  void *Buffer(int noWait=1);

  int Update(const ngcdcs_finfo_t &finfo, int endian, int fullFrame = 0);

  void Next();

  int Export(const ngcdcs_finfo_t &finfo, int endian);

  void Wait();

  int TryWait();                      

  int Locked();

  int LockNext(int noWait = 1);

  void Unlock(int noWait);

  virtual void *Alloc(size_t size); 

  virtual void Free(); 

  virtual int SetName(const char *newName);
 
protected: 
  FILE *watchdog;

  void **buffer; 

  size_t bufferSize;  

  char thisHost[46];

  void Initialized(int flag) {
    if (flag)  initialized_ = 1;
    else initialized_ = 0;
  }

  void Reset() {idx_ = 0;}

  void InvalidateBuffers() {idx_ = -1;}

  virtual void InvalidateEvent() {};

  virtual void BufferWait(int idx);

  virtual int BufferLocked(int idx);

  virtual int BufferLock(int idx);

  virtual int BufferTryLock(int idx);

  virtual void BufferUnlock(int idx) {};

  virtual int Publish(int idx, const ngcdcs_finfo_t &finfo, int endian, 
              int fullFrame);
 
private:
  void Init_();
  
  char erms_[256];

  int initialized_;         

  int numBuf_; 
        
  int idx_;

  int spare_;
  
};
 
#endif