Class Gate

Placement in the overall structure

Module

guard

Base classes

Chain

Derived classes

Keyboard

Panic

Time of creation

Task 2

Modified in

Task 3

Files

gate.h

Description

The abstract class Gate is the basis of the interrupt handling. The classes of all objects to be registered in the Plugbox must be derived from Gate and define the virtual method prologue (). An empty implementation can be specified in Gate for the epilogue () virtual method, so derived classes do not necessarily have to define an epilogue. To determine whether a Gate object has already been added to an epilog queue, a corresponding Boolean attribute should be included in the class, which can be set and get by access functions.

Public methods

virtual bool prologue ()

Interrupt-handler routine that is executed immediately after the interrupt occurs, asynchronously to other kernel activities. The return value signals whether the epilogue should be executed.

virtual void epilogue ()

Potentially delayed and synchronously executed interrupt handler.

void queued (bool q)

Sets a flag that remembers whether the epilogue is enqueued.

bool queued ()

Checks whether the epilogue is enqueued.