Package org.deepjava.runtime.ppc32

Class Task

java.lang.Object

org.deepjava.runtime.ppc32.Task

All Implemented Interfaces:

Ippc32, Actionable

Direct Known Subclasses:

BlueRS, BlueRSCmdInt, BlueRSCmdIntDemo, BlueRSDemo, CAN1Test, DateTime, EPOStest1, ExceptionDemo, FileTransfer, HD44780U, HLC1395Demo, HLC1395Pulsed, MotorDemo1, RN131, Robi2, Robi2LedBlinkerDemo, Robi2LineTask, Robi2MotorDemo, Robi2ObstacleTask, Robi2SensorProximityDemo_Led, Robi2SensorProximityDemo_Out, SimpleBlinkerDemo, SimpleBlinkerDemo, SPIDemo, SystemInOutReflector, SystemOutDemo1, SystemOutDemo2, UART3Demo, UART3InOutReflector, UART6Demo, VL53L0X, VL53L0XTest, WifiDemo

public class Task
extends Object
implements Actionable, Ippc32

This class implements a simple non-preemptive tasking system. Each task runs to completion. After this the next task in the ready queue will run. Tasks with a period equal to 0 will be rescheduled immediately after completion Tasks with a period greater than 0 will be scheduled when their time has come.

Author:

urs.graf@ntb.ch

Field Summary

Fields

Modifier and Type	Field	Description
static boolean	done
static int	firstErr	first error occurred, see this error list 1: error at installation 2: too many tasks 3: task is already or still installed
static int	maxNofTasks
int	nofActivations	number of activations
int	period	period: 0 <= period : period time in ms The period is must be specified before installation of the task by calling install.
boolean	safe	safe=FALSE -> task gets removed on trap, currently not used
int	time	time: 0 <= time : start time in ms from install time

Fields inherited from interface org.deepjava.runtime.ppc32.Ippc32

CR, CTR, DAR, DEC, DSISR, FPR0, FPR1, FPR10, FPR11, FPR12, FPR13, FPR14, FPR15, FPR16, FPR17, FPR18, FPR19, FPR2, FPR20, FPR21, FPR22, FPR23, FPR24, FPR25, FPR26, FPR27, FPR28, FPR29, FPR3, FPR30, FPR31, FPR4, FPR5, FPR6, FPR7, FPR8, FPR9, FPSCR, LR, MSR, R0, R1, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R2, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R3, R30, R31, R4, R5, R6, R7, R8, R9, SPR1, SPR18, SPR19, SPR22, SPR26, SPR268, SPR269, SPR27, SPR272, SPR273, SPR274, SPR275, SPR287, SPR8, SPR9, SPRG0, SPRG1, SPRG2, SPRG3, SRR0, SRR1, TBLread, TBUread, XER

Constructor Summary

Constructors

Constructor	Description
Task()	Creates a new Task.
Task(Actionable act)	Creates a new Task.

Method Summary

Modifier and Type	Method	Description
void	action()	Action to be performed by the task
(package private) static void	error(int n)
static void	install(Task task)	Installs a new Task.
(package private) static void	loop()
static void	remove(Task task)	Removes an installed task
static int	time()	Returns system time in milliseconds, time starts at powerup

Methods inherited from class java.lang.Object

equals, getClass, hashCode, toString

Field Detail

maxNofTasks

public static final int maxNofTasks

See Also:

Constant Field Values

done

public static boolean done

firstErr

public static int firstErr

first error occurred, see this error list
1: error at installation
2: too many tasks
3: task is already or still installed

time

public int time

time: 0 <= time : start time in ms from install time

period

public int period

period: 0 <= period : period time in ms
The period is must be specified before installation of the task by calling install. Subsequent modifications of this value do not have any effects!

nofActivations

public int nofActivations

number of activations

safe

public boolean safe

safe=FALSE -> task gets removed on trap, currently not used

Constructor Detail

Task

public Task()

Creates a new Task.
It's action method will be called by the task scheduler

Task

public Task(Actionable act)

Creates a new Task.
The action method of the parameter Actionable will be called by the task scheduler

Parameters:

act - Actionable to be installed.

Method Detail

error

static void error(int n)

action

public void action()

Action to be performed by the task

Specified by:

action in interface Actionable

time

public static int time()

Returns system time in milliseconds, time starts at powerup

Returns:

Current time in ms.

install

public static void install(Task task)

Installs a new Task.

Parameters:

task - Task to be installed.

remove

public static void remove(Task task)

Removes an installed task

Parameters:

task - Task to be removed.

loop

static void loop()