scheduler.h

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// scheduler.h 
//      Data structures for the thread dispatcher and scheduler.
//      Primarily, the list of threads that are ready to run.
//
// Copyright (c) 1992-1996 The Regents of the University of California.
// All rights reserved.  See copyright.h for copyright notice and limitation 
// of liability and disclaimer of warranty provisions.

#ifndef SCHEDULER_H
#define SCHEDULER_H

#include "copyright.h"
#include "list.h"
#include "thread.h"

// The following class defines the scheduler/dispatcher abstraction -- 
// the data structures and operations needed to keep track of which 
// thread is running, and which threads are ready but not running.

class Scheduler {
  public:
    Scheduler();                // Initialize list of ready threads 
    ~Scheduler();               // De-allocate ready list

    void ReadyToRun(Thread* thread);    
                                // Thread can be dispatched.
    Thread* FindNextToRun();    // Dequeue first thread on the ready 
                                // list, if any, and return thread.
    void Run(Thread* nextThread, bool finishing);
                                // Cause nextThread to start running
    void CheckToBeDestroyed();// Check if thread that had been
                                // running needs to be deleted
    void Print();               // Print contents of ready list
    
    // SelfTest for scheduler is implemented in class Thread
    
  private:
    List<Thread *> *readyList;  // queue of threads that are ready to run,
                                // but not running
    Thread *toBeDestroyed;      // finishing thread to be destroyed
                                // by the next thread that runs
};

#endif // SCHEDULER_H

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