/*

File:SCSIEmulatorEventSource.cpp

Abstract: Implementaion of an IOEventSource subclass used to respond to
		SCSI tasks on the IOSCSIParallelInterfaceController workloop

Version: 1.0

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*/

#include "SCSIEmulatorEventSource.h"
#include "SCSIEmulatorAdapter.h"


// Define superclass
#define super IOEventSource

// REQUIRED! This macro defines the class's constructors, destructors,
// and several other methods I/O Kit requires. Do NOT use super as the
// second parameter. You must use the literal name of the superclass.
OSDefineMetaClassAndStructors(com_apple_dts_SCSIEmulatorEventSource, IOEventSource)


bool com_apple_dts_SCSIEmulatorEventSource::init(com_apple_dts_SCSIEmulatorAdapter *ourAdapter, com_apple_dts_SCSIEmulatorEventSource::Action action)
{
	bool res = super::init(ourAdapter, (IOEventSource::Action) action);

	if (res) {
		queue_init(&mResponderQueue);
	} else {
		IOLog("SCSIEmulatorEventSource: failed super::init()\n");
	}

	return res;
}


void com_apple_dts_SCSIEmulatorEventSource::free(void)
{
	super::free();
}

bool com_apple_dts_SCSIEmulatorEventSource::addItemToQueue(SCSIEmulatorRequestBlock* elem)
{
	closeGate();
	queue_enter(&mResponderQueue, elem, SCSIEmulatorRequestBlock *, fQueueChain);
	openGate();
	
	signalWorkAvailable();
	
	return true;
}

bool com_apple_dts_SCSIEmulatorEventSource::checkForWork()
{
	SCSIEmulatorRequestBlock* elem = NULL;

	while (!queue_empty(&mResponderQueue)) {
		queue_remove_first(&mResponderQueue, elem, SCSIEmulatorRequestBlock *, fQueueChain);

		if (action && owner && elem) {
			(*action)(owner, *elem);
		}
	};

	return (!queue_empty(&mResponderQueue));
}