1/*
2 * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28#include <libkern/c++/OSObject.h>
29#include <IOKit/IOLocks.h>
30#include <IOKit/IOReturn.h>
31
32class IOPMinformee;
33class IOService;
34
35class IOPMinformeeList : public OSObject
36{
37OSDeclareDefaultStructors(IOPMinformeeList)
38    friend class IOPMinformee;
39
40private:
41    // pointer to first informee in the list
42    IOPMinformee       *firstItem;
43    // how many informees are in the list
44    unsigned long       length;
45
46public:
47    void initialize ( void );
48    void free ( void );
49
50    unsigned long numberOfItems ( void );
51
52    IOPMinformee *appendNewInformee( IOService * newObject );
53
54    // OBSOLETE
55    // do not use addToList(); Use appendNewInformee() instead
56    IOReturn addToList ( IOPMinformee *   newInformee );
57    IOReturn removeFromList ( IOService * theItem );
58
59    IOPMinformee * firstInList ( void );
60    IOPMinformee * nextInList ( IOPMinformee * currentItem );
61
62    IOPMinformee * findItem ( IOService * driverOrChild );
63
64    // This lock must be held while modifying list or length
65    static IORecursiveLock * getSharedRecursiveLock( void );
66};
67
68