nachos.threads
Class RoundRobinScheduler

java.lang.Object
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  +--nachos.threads.Scheduler
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        +--nachos.threads.RoundRobinScheduler

public class RoundRobinScheduler

extends Scheduler

A round-robin scheduler tracks waiting threads in FIFO queues, implemented with linked lists. When a thread begins waiting for access, it is appended to the end of a list. The next thread to receive access is always the first thread in the list. This causes access to be given on a first-come first-serve basis.

Constructor Summary

RoundRobinScheduler()
Allocate a new round-robin scheduler.

Method Summary

ThreadQueue

newThreadQueue(boolean transferPriority) Allocate a new FIFO thread queue.

Methods inherited from class nachos.threads.Scheduler

decreasePriority, getEffectivePriority, getEffectivePriority, getPriority, getPriority, increasePriority, setPriority, setPriority

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RoundRobinScheduler

public RoundRobinScheduler()

Allocate a new round-robin scheduler.

Method Detail

newThreadQueue

public ThreadQueue newThreadQueue(boolean transferPriority)

Allocate a new FIFO thread queue.

Overrides:

newThreadQueue in class Scheduler

Parameters:

transferPriority - ignored. Round robin schedulers have no priority.

Returns:

a new FIFO thread queue.