////////////////////////////////////////////////////////////////////////
// class CBuffer
//
// $Log: buffer.h,v $
// Revision 1.2  1997/07/23 18:27:14  nettleto
// Add code to clear buffer so that all variables are
// initialized.
//
// Revision 1.1  1997/06/13 18:10:34  nettleto
// Initial revision
//
//

#ifndef BUFFER_H
#define BUFFER_H

#include "mutex.h"
#include "cond.h"

#define SIZE 64


// CBuffer is a traditional cyclic buffer with a single mutex for the
// input and output sides, and two signal mechanisms, one to indicate the
// buffer may contain data, and one to indicate that it may no longer be
// full.

class CBuffer
{
protected:
  // Mutex to protect the attributes
  CMutex m;
  // attributes
  char Buf [SIZE];
  int N;             // Number of elements in the buffer
  int Inp, Outp;     // Index of next empty/full slot
  CCond Inc, Outc;   // Input and output conds
public:
  CBuffer ()
    {
      for (int i = 0; i < SIZE; i++)
        Buf [i] = 0;
      N = 0; 
      Inp = Outp = 0;
    }
  void Put (int c);
  void Get (int &c);
};


#endif // BUFFER_H