IOPMPowerStateQueue.cpp

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 * Copyright (c) 2001-2002 Apple Computer, Inc. All rights reserved.
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 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
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 * may not be used to create, or enable the creation or redistribution of,
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 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
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 *
 * The Original Code and all software distributed under the License are
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#include "IOPMPowerStateQueue.h"

#define super IOEventSource
OSDefineMetaClassAndStructors( IOPMPowerStateQueue, IOEventSource )

IOPMPowerStateQueue * IOPMPowerStateQueue::PMPowerStateQueue(
	OSObject * inOwner, Action inAction )
{
	IOPMPowerStateQueue * me = new IOPMPowerStateQueue;

	if (me && !me->init(inOwner, inAction)) {
		me->release();
		return NULL;
	}

	return me;
}

bool
IOPMPowerStateQueue::init( OSObject * inOwner, Action inAction )
{
	if (!inAction || !(super::init(inOwner, inAction))) {
		return false;
	}

	queue_init( &queueHead );

	queueLock = IOLockAlloc();
	if (!queueLock) {
		return false;
	}

	return true;
}

bool
IOPMPowerStateQueue::submitPowerEvent(
	uint32_t eventType,
	void *   arg0,
	uint64_t arg1 )
{
	PowerEventEntry * entry;

	entry = IONew(PowerEventEntry, 1);
	if (!entry) {
		return false;
	}

	entry->eventType = eventType;
	entry->arg0 = arg0;
	entry->arg1 = arg1;

	IOLockLock(queueLock);
	queue_enter(&queueHead, entry, PowerEventEntry *, chain);
	IOLockUnlock(queueLock);
	signalWorkAvailable();

	return true;
}

bool
IOPMPowerStateQueue::checkForWork( void )
{
	IOPMPowerStateQueueAction queueAction = (IOPMPowerStateQueueAction) action;
	PowerEventEntry * entry;

	IOLockLock(queueLock);
	while (!queue_empty(&queueHead)) {
		queue_remove_first(&queueHead, entry, PowerEventEntry *, chain);
		IOLockUnlock(queueLock);

		(*queueAction)(owner, entry->eventType, entry->arg0, entry->arg1);
		IODelete(entry, PowerEventEntry, 1);

		IOLockLock(queueLock);
	}
	IOLockUnlock(queueLock);

	return false;
}