/*

File:SCSIEmulatorEventSource.h

Abstract: Header for an IOEventSource subclass used to respond to SCSI tasks

        on the IOSCSIParallelInterfaceController workloop

Version: 1.0

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*/

#ifndef _SCSIEMULATOREVENTSOURCE_H

#define _SCSIEMULATOREVENTSOURCE_H

#include <kern/queue.h>

#include <IOKit/IOEventSource.h>

#include <IOKit/scsi/spi/IOSCSIParallelInterfaceController.h>

class com_apple_dts_SCSIEmulatorAdapter;

typedef struct {

    queue_chain_t               fQueueChain;

    SCSIParallelTaskIdentifier  fTask;

    SCSITaskStatus              fTaskStatus;

    SCSIServiceResponse         fServiceResponse;

} SCSIEmulatorRequestBlock;

class com_apple_dts_SCSIEmulatorEventSource : public IOEventSource {

OSDeclareDefaultStructors(com_apple_dts_SCSIEmulatorEventSource)

public:

    typedef void (*Action) (com_apple_dts_SCSIEmulatorAdapter *owner, SCSIEmulatorRequestBlock srb);

    virtual bool                            init(com_apple_dts_SCSIEmulatorAdapter *ourAdapter, com_apple_dts_SCSIEmulatorEventSource::Action action = 0);

    virtual void                            free(void);

    virtual bool                            addItemToQueue(SCSIEmulatorRequestBlock* elem);

protected:

    /*! @function checkForWork

        @abstract Pure Virtual member function used by IOWorkLoop for work scheduling.

        @discussion This function will be called to request a subclass to check it's internal state for any work to do and then to call out the owner/action.

        @result Return true if this function needs to be called again before all its outstanding events have been processed.

    */

    virtual bool checkForWork();

private:

    queue_head_t mResponderQueue;

};

#endif