// sched.h
//
// ABC for scheduler parts.

// macro guard
#ifndef __SCHED_H
#define __SCHED_H

#include "linkedlist.h"

typedef struct
{
  int start_time;
  int exit_time;
  int execution_time;
  int time_remaining;
  
} pcb;

class sched

// scheduler will be run every time cycle
{
public:
  virtual void schedule(int nextproc, int timeindex, linked_list<pcb*>* run) = 0;
  // nextproc is the execution time of the next process
  // timeindex is the current clock
  // run is a pointer to the run queue
};

// -------------------------------------------------------------

class fcfs : public sched
{
// first come first served scheduling algorithm
public:
  void schedule(int nextproc, int timeindex, linked_list<pcb*>* run);
};

// -------------------------------------------------------------

class rr : public sched
// round-robin scheduling algorithm
{
public:
  void schedule(int nextproc, int timeindex, linked_list<pcb*>* run);
};

// -------------------------------------------------------------

class sjn : public sched
// shortest job next scheduling algorithm
{
public:
  void schedule(int nextproc, int timeindex, linked_list<pcb*>* run);
};

#endif