/*

    File:       TimerEventSample.h

    Description:

                Header for simple sample KEXT that shows how use a timer event source.

    Author:     JAS

    Copyright:  © Copyright 2001 Apple Computer, Inc. All rights reserved.

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    Change History (most recent first):

    03/28/01    JAS Created

*/

#include <IOKit/IOService.h>

#include <IOKit/IOTimerEventSource.h>

// TimerEventSample class

class TimerEventSample : public IOService

{

OSDeclareDefaultStructors( TimerEventSample )

public:

    // member variables

    IOWorkLoop*         myWorkLoop;     // holds the workloop for this driver

    IOTimerEventSource* myTimer;        // holds the timer we create

    UInt32              counter;        // counter incremented each time the timeout handler is called

    /*

        counter is used for two things:

        1). it shows how many times the timeoutHandler has been called

        2). it makes the message printed from the timeoutHandler different each time

            if the message printed was the same each time, you'd see entries in the 

            system.log like "last message repeated 3 times".

    */

    // standard IOKit methods

    virtual bool init(OSDictionary *dictionary = 0);

    virtual void free(void);

    virtual IOService *probe(IOService *provider, SInt32 *score);

    virtual bool start(IOService *provider);

    virtual void stop(IOService *provider);

    // timer event handler, the function that is called when the timer fires

    static void timeoutHandler(OSObject *owner, IOTimerEventSource *sender);

};