/*
* Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 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. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * 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
* Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <IOKit/pwr_mgt/IOPM.h>
#include <IOKit/pwr_mgt/IOPMinformeeList.h>
length = 0;
}
+//******************************************************************************
+// getSharedRecursiveLock
+//
+//******************************************************************************
+IORecursiveLock *IOPMinformeeList::getSharedRecursiveLock( void )
+{
+ static IORecursiveLock *sharedListLock = NULL;
+
+ /* A running system could have 50-60+ instances of IOPMInformeeList.
+ * They'll share this lock, since list insertion and removal is relatively
+ * rare, and generally tied to major events like device discovery.
+ *
+ * getSharedRecursiveLock() is called from IOStartIOKit to initialize
+ * the sharedListLock before any IOPMinformeeLists are instantiated.
+ *
+ * The IOPMinformeeList class will be around for the lifetime of the system,
+ * we don't worry about freeing this lock.
+ */
+
+ if ( NULL == sharedListLock )
+ {
+ sharedListLock = IORecursiveLockAlloc();
+ }
+ return sharedListLock;
+}
+
+ //*********************************************************************************
+// appendNewInformee
+ //
+ //*********************************************************************************
+IOPMinformee *IOPMinformeeList::appendNewInformee ( IOService * newObject )
+{
+ IOPMinformee * newInformee;
+
+ if (!newObject)
+ return NULL;
+
+ newInformee = IOPMinformee::withObject (newObject);
+
+ if (!newInformee)
+ return NULL;
+
+ if( IOPMNoErr == addToList (newInformee))
+ return newInformee;
+ else
+ return NULL;
+}
+
+
//*********************************************************************************
// addToList
-//
+// *OBSOLETE* do not call from outside of this file.
+// Try appendNewInformee() instead
//*********************************************************************************
-
IOReturn IOPMinformeeList::addToList ( IOPMinformee * newInformee )
{
IOPMinformee * nextInformee;
- nextInformee = firstItem; // Is new object already in the list?
- while ( nextInformee != NULL ) {
- if ( nextInformee->whatObject == newInformee->whatObject ) {
- return IOPMNoErr; // yes, just return
+ IORecursiveLock *listLock = getSharedRecursiveLock();
+
+ if(!listLock)
+ return kIOReturnError;
+
+ IORecursiveLockLock(listLock);
+ nextInformee = firstItem;
+
+ // Is new object already in the list?
+ while ( nextInformee != NULL )
+ {
+ if ( nextInformee->whatObject == newInformee->whatObject )
+ {
+ // object is present; just exit
+ goto unlock_and_exit;
}
nextInformee = nextInList(nextInformee);
}
- newInformee->nextInList = firstItem; // add it to list
+
+ // add it to the front of the list
+ newInformee->nextInList = firstItem;
firstItem = newInformee;
- length += 1;
+ length++;
+
+unlock_and_exit:
+ IORecursiveLockUnlock(listLock);
+ return IOPMNoErr;
+}
+
+
+//*********************************************************************************
+// removeFromList
+//
+// Find the item in the list, unlink it, and free it.
+//*********************************************************************************
+
+IOReturn IOPMinformeeList::removeFromList ( IOService * theItem )
+{
+ IOPMinformee * item = firstItem;
+ IOPMinformee * temp;
+ IORecursiveLock *listLock = getSharedRecursiveLock();
+
+ if ( NULL == item )
+ return IOPMNoErr;
+ if(!listLock)
+ return kIOReturnError;
+
+ IORecursiveLockLock( listLock );
+
+ if ( item->whatObject == theItem )
+ {
+ firstItem = item->nextInList;
+ length--;
+ item->release();
+ goto unlock_and_exit;
+ }
+
+ while ( item->nextInList != NULL )
+ {
+ if ( item->nextInList->whatObject == theItem )
+ {
+ temp = item->nextInList;
+ item->nextInList = temp->nextInList;
+ length--;
+ temp->release();
+ goto unlock_and_exit;
+ }
+ item = item->nextInList;
+ }
+
+unlock_and_exit:
+ IORecursiveLockUnlock(listLock);
return IOPMNoErr;
}
}
-//*********************************************************************************
-// removeFromList
-//
-// Find the item in the list, unlink it, and free it.
-//*********************************************************************************
-
-IOReturn IOPMinformeeList::removeFromList ( IOService * theItem )
-{
- IOPMinformee * item = firstItem;
- IOPMinformee * temp;
-
- if ( item != NULL ) {
- if ( item->whatObject == theItem ) {
- firstItem = item->nextInList;
- length--;
- item->release();
- return IOPMNoErr;
- }
- while ( item->nextInList != NULL ) {
- if ( item->nextInList->whatObject == theItem ) {
- temp = item->nextInList;
- item->nextInList = temp->nextInList;
- length--;
- temp->release();
- return IOPMNoErr;
- }
- item = item->nextInList;
- }
- }
- return IOPMNoErr;
-}
-
//*********************************************************************************
// free
projects / apple / xnu.git / blobdiff