scGPMessagefifo.h

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 /*  @author János Végh (jvegh)
 *  @bug No known bugs.
 */
 
#ifndef scGPMessagefifo_h
#define scGPMessagefifo_h
 
//#include <systemc>
//#include "BasicConfig.h"
//#include "scIGPfifo.h"
using namespace std;
using namespace sc_core;
using namespace sc_dt;
class scIGPMessage;
 
class scGPMessagefifowrite_if : virtual public sc_interface
{
   public:
     virtual void write(scIGPMessage*) = 0;
     virtual void reset() = 0;
};
 
class scGPMessagefiforead_if : virtual public sc_interface
{
   public:
     virtual void read(scIGPMessage*&) = 0;
     virtual int num_available() = 0;
};
 
class scGPMessagefifo : public sc_channel, public scGPMessagefifowrite_if, public scGPMessagefiforead_if
{
//    friend class scGridPoint;
    friend class scIGPMessage_if;
  public:
     scGPMessagefifo(sc_module_name name) : sc_channel(name), num_elements(0), first(0) {}
 
     void write(scIGPMessage* c) {
       if (num_elements == max)
         wait(scGPMessagefifo_read_event);
 
       data[(first + num_elements) % max] = c;
       ++ num_elements;
       scGPMessagefifo_write_event.notify();
     }
 
     void read(scIGPMessage* &c){
       if (num_elements == 0)
         wait(scGPMessagefifo_write_event);
 
       c = data[first];
       -- num_elements;
       first = (first + 1) % max;
       scGPMessagefifo_read_event.notify();
     }
 
     void reset() { num_elements = first = 0; }
 
     int num_available() { return num_elements;}
 
   private:
     enum e { max = 10 };
     scIGPMessage* data[max];
     uint16_t num_elements, first;
     sc_event scGPMessagefifo_write_event, scGPMessagefifo_read_event;
};
 
#endif //scGPMessagefifo_h