--- /dev/null
+++ xnu/xnu-11215.81.4/iokit/Kernel/IOPMPowerStateQueue.cpp
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2001-2002 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+#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 = IOMallocType(PowerEventEntry);
+
+	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);
+		IOFreeType(entry, PowerEventEntry);
+
+		IOLockLock(queueLock);
+	}
+	IOLockUnlock(queueLock);
+
+	return false;
+}