gk.h

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 * Copyright (c) 1994 Regents of the University of California.
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#ifndef ns_gk_h
#define ns_gk_h
 
#include <string.h>
#include "queue.h"

class LinkDelay; 

class GK : public Queue {
 public:
    GK(const char *);
 protected:
  int command(int argc, const char*const* argv);
  void enque(Packet*);
  Packet* deque();
  void deque_vq();    /* Deques from the virtual queue_ */
    LinkDelay* link_; /* outgoing link */
  PacketQueue *q_;    /* underlying FIFO queue */
  int drop_front_;    /* drop-from-front (rather than from tail) */
  double ecnlim_;     /* Factor by which capacity and buffer is acled down*/
  double vq_len;      /* Virtual Queue length */
  double c_;          /* Capacity of the link */
  int mark_flag;      /* Indicates that all outgoing packets shd be marked */
  double prev_time;
  double curr_time;
    int mean_pktsize_;
    TracedInt curq_;    /* current qlen seen by arrivals */

    // added to be able to trace EDrop Objects
    // the other events - forced drop, enque and deque are traced by a 
    // different mechanism.
    NsObject * EDTrace;    //early drop trace
    char traceType[20];    /* the preferred type for early drop trace. 
                                                        better be less than 19 chars long */
    Tcl_Channel tchan_; /* place to write trace records */
    void trace(TracedVar*); /* routine to write trace records */
};

#endif

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