peq_with_cb_and_phase.h

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  All Rights reserved.

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  set forth in the SystemC Open Source License (the "License");
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// 12-Jan-2009  John Aynsley  Bug fix. Phase argument to notify should be const
// 20-Mar-2009  John Aynsley  Add cancel_all() method


#ifndef __PEQ_WITH_CB_AND_PHASE_H__
#define __PEQ_WITH_CB_AND_PHASE_H__

#ifndef SC_INCLUDE_DYNAMIC_PROCESSES // needed for sc_spawn
#  define SC_INCLUDE_DYNAMIC_PROCESSES
#endif

#include <vector>
#include <systemc>
#include <tlm>

namespace tlm_utils {

template <typename PAYLOAD>
class time_ordered_list
{
public:
  struct element
  {
    struct element  *next;
    PAYLOAD p;
    sc_core::sc_time t;
    sc_dt::uint64 d;
    element(PAYLOAD& p, sc_core::sc_time t, sc_dt::uint64 d): p(p),t(t),d(d) {}
    element(){}
  };

  element *nill;
  element *empties;
  element *list;
  unsigned int size;

  time_ordered_list()
    : nill(new element()),
      empties(NULL),
      list(nill),
      size(0)
  {
  }

  ~time_ordered_list() {
    reset();
    while(empties){
      struct element *e=empties->next;
      delete empties;
      empties=e;
    }
    delete nill;
  }

  void reset() {
    while(size) {
      delete_top();
    }
  }

  void insert(const PAYLOAD& p, sc_core::sc_time t) {
    if (!empties) {
      empties=new struct element();
      empties->next=NULL;
    }

    struct element *e=empties;
    empties=empties->next;
    e->p=p;
    e->t=t;
    e->d=sc_core::sc_delta_count();

    struct element * ancestor=nill;
    struct element * iterator=list;
    while (iterator!=nill && iterator->t<=t){
      ancestor=iterator;
      iterator=iterator->next;
    }
    if (ancestor==nill){
      e->next=list;
      list=e;
    }
    else {
      e->next=iterator;
      ancestor->next=e;
    }
    size++;
  }

  void delete_top(){
    if (list != nill) {
      struct element *e=list;
      list=list->next;
      e->next=empties;
      empties=e;
      size--;
    }
  }

  unsigned int get_size()
  {
    return size;
  }

  PAYLOAD &top()
  {
    return list->p;
  }
  sc_core::sc_time top_time()
  {
    return list->t;
  }

  sc_dt::uint64& top_delta()
  {
    return list->d;
  }

  sc_core::sc_time next_time()
  {
    return list->next->t;
  }
};

//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
template<typename OWNER,typename TYPES=tlm::tlm_base_protocol_types>
class peq_with_cb_and_phase:
  public sc_core::sc_object
{

  typedef typename TYPES::tlm_payload_type tlm_payload_type;
  typedef typename TYPES::tlm_phase_type   tlm_phase_type;
  typedef std::pair<tlm_payload_type*, tlm_phase_type> PAYLOAD;
  typedef void (OWNER::*cb)(tlm_payload_type&, const tlm_phase_type&);

  class delta_list{
  public:
    delta_list(){
      reset();
      entries.resize(100);
    }

    inline void insert(const PAYLOAD& p){
      if (size==entries.size()){
        entries.resize(entries.size()*2);
      }
      entries[size++]=p;
    }

    inline PAYLOAD& get(){
      return entries[out++];
    }

    inline bool next(){
      return out<size;
    }

    inline void reset(){
      size=0;
      out=0;
    }
  public:
    unsigned int size;
  private:
    std::vector<PAYLOAD> entries;
    unsigned int out;
  };

public:

  peq_with_cb_and_phase(OWNER* _owner, cb _cb)
    :sc_core::sc_object( sc_core::sc_gen_unique_name( "peq_with_cb_and_phase" ) )
    ,m_owner(_owner)
    ,m_cb(_cb)
  {
    sc_core::sc_spawn_options opts;
    opts.spawn_method();
    opts.set_sensitivity(&m_e);
    opts.dont_initialize();
    sc_core::sc_spawn(sc_bind(&peq_with_cb_and_phase::fec, this),
                      sc_core::sc_gen_unique_name("fec"), &opts);
  }

  peq_with_cb_and_phase(const char* _name, OWNER* _owner,cb _cb)
    : sc_core::sc_object( _name )
    ,m_owner(_owner)
    ,m_cb(_cb)
  {
    sc_core::sc_spawn_options opts;
    opts.spawn_method();
    opts.set_sensitivity(&m_e);
    opts.dont_initialize();
    sc_core::sc_spawn(sc_bind(&peq_with_cb_and_phase::fec, this),
                      sc_core::sc_gen_unique_name("fec"), &opts);
  }

  ~peq_with_cb_and_phase(){}

  void notify (tlm_payload_type& t, const tlm_phase_type& p, const sc_core::sc_time& when){
    //t.aquire();
    if (when==sc_core::SC_ZERO_TIME) {
      if (sc_core::sc_delta_count() & (sc_dt::uint64)0x1) //uneven delta cycle so delta delay is for even cylce
        m_even_delta.insert(PAYLOAD(&t,p));
      else
        m_uneven_delta.insert(PAYLOAD(&t,p)); //even delta cycle so delta delay is for uneven delta
      m_e.notify(sc_core::SC_ZERO_TIME);
    }
    else {
      m_ppq.insert(PAYLOAD(&t,p),  when + sc_core::sc_time_stamp() );
      m_e.notify(when); // note, this will only over-right the "newest" event.
    }
  }

  void notify (tlm_payload_type& t, const tlm_phase_type& p){
    m_immediate_yield.insert(PAYLOAD(&t,p));
    m_e.notify(); // immediate notification
  }

  // Cancel all events from the event queue
  void cancel_all() {
    m_ppq.reset();
    m_uneven_delta.reset();
    m_even_delta.reset();
    m_immediate_yield.reset();
    m_e.cancel();
  }

private:

  void fec(){
    //immediate yield notifications
    while(m_immediate_yield.next()) {PAYLOAD& tmp=m_immediate_yield.get(); (m_owner->*m_cb)(*tmp.first, tmp.second);} //tmp.first->release();}
    m_immediate_yield.reset();

    //delta notifications
    if (sc_core::sc_delta_count() & (sc_dt::uint64) 0x1) {//uneven delta so put out all payloads for uneven delta
      while (m_uneven_delta.next()) {PAYLOAD& tmp=m_uneven_delta.get(); (m_owner->*m_cb)(*tmp.first, tmp.second);} //tmp.first->release();}
      m_uneven_delta.reset();
      if (m_even_delta.size) m_e.notify(sc_core::SC_ZERO_TIME);
    }
    else {
      while (m_even_delta.next()) {PAYLOAD& tmp=m_even_delta.get(); (m_owner->*m_cb)(*tmp.first, tmp.second);} //tmp.first->release();}
      m_even_delta.reset();
      if (m_uneven_delta.size) m_e.notify(sc_core::SC_ZERO_TIME);
    }
    if (!m_ppq.get_size()) return; //there were only delta notification

    //timed notifications
    const sc_core::sc_time now=sc_core::sc_time_stamp();
    sc_core::sc_time top=m_ppq.top_time();

    while(m_ppq.get_size() && top==now) { // push all active ones into target
      PAYLOAD& tmp=m_ppq.top();
      (m_owner->*m_cb)(*tmp.first, tmp.second); //tmp.first->release();}
      m_ppq.delete_top();
      top=m_ppq.top_time();
    }
    if ( m_ppq.get_size()) {
      m_e.notify( top - now) ;
    }

  }

  OWNER* m_owner;
  cb     m_cb;

  time_ordered_list<PAYLOAD> m_ppq;
  delta_list m_uneven_delta;
  delta_list m_even_delta;
  delta_list m_immediate_yield;

  sc_core::sc_event m_e;   // default event
};

}

#endif // __PEQ_WITH_CB_AND_PHASE_H__