scheduler.h

Go to the documentation of this file.

// scheduler.h
//      Data structures for the thread dispatcher and scheduler.
//      Primarily, the list of threads that are ready to run.
//
// Copyright (c) 1992-1993 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"



extern sigset_t timer_mask;
#define SCHED() siglongjmp(schd_jmp, 1)

void SetPreemption();
void timerInit();
void schedule();
// 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    Print();    // Print contents of ready list
    int     IsEmpty();

    static void timerIntH(int sig);


private:
    List *readyList; // queue of threads that are ready to run, but not running

    // new additions

};

#endif // SCHEDULER_H

---