nachos.machine
Class StandardConsole

java.lang.Object
  nachos.machine.StandardConsole

All Implemented Interfaces:

SerialConsole

public class StandardConsole
extends Object
implements SerialConsole

A text-based console that uses System.in and System.out.

Constructor Summary

StandardConsole(Privilege privilege)
Allocate a new standard console.

Method Summary

protected int	in() Attempt to read a byte from the object backing this console.
protected void	out(int value) Write a byte to the object backing this console.
int	readByte() Return the next unsigned byte received (in the range 0 through 255).
void	setInterruptHandlers(Runnable receiveInterruptHandler, Runnable sendInterruptHandler) Set this console's receive and send interrupt handlers.
void	writeByte(int value) Send another byte.

Methods inherited from class java.lang.Object

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

Constructor Detail

StandardConsole

public StandardConsole(Privilege privilege)

Allocate a new standard console.

Parameters:

privilege - encapsulates privileged access to the Nachos machine.

Method Detail

setInterruptHandlers

public final void setInterruptHandlers(Runnable receiveInterruptHandler,
                                       Runnable sendInterruptHandler)

Description copied from interface: SerialConsole

Set this console's receive and send interrupt handlers.

The receive interrupt handler is called every time another byte arrives and can be read using readByte().

The send interrupt handler is called every time a byte sent with writeByte() is finished being sent. This means that another byte can be sent.

Specified by:

setInterruptHandlers in interface SerialConsole

Parameters:

receiveInterruptHandler - the callback to call when a byte arrives.

sendInterruptHandler - the callback to call when another byte can be sent.

in

protected int in()

Attempt to read a byte from the object backing this console.

Returns:

the byte read, or -1 of no data is available.

readByte

public final int readByte()

Description copied from interface: SerialConsole

Return the next unsigned byte received (in the range 0 through 255).

Specified by:

readByte in interface SerialConsole

Returns:

the next byte read, or -1 if no byte is available.

out

protected void out(int value)

Write a byte to the object backing this console.

Parameters:

value - the byte to write.

writeByte

public final void writeByte(int value)

Description copied from interface: SerialConsole

Send another byte. If a byte is already being sent, the result is not defined.

Specified by:

writeByte in interface SerialConsole

Parameters:

value - the byte to be sent (the upper 24 bits are ignored).