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Annotation of XNU/iokit/Kernel/IOPMinformeeList.cpp, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: #include <stddef.h> 
        !            23: #include <IOKit/pwr_mgt/IOPM.h>
        !            24: #include <IOKit/pwr_mgt/IOPMinformeeList.h>
        !            25: #include <IOKit/pwr_mgt/IOPMinformee.h>
        !            26: 
        !            27: #define super OSObject
        !            28: OSDefineMetaClassAndStructors(IOPMinformeeList,OSObject)
        !            29: 
        !            30: //*********************************************************************************
        !            31: // init
        !            32: //
        !            33: //*********************************************************************************
        !            34: void IOPMinformeeList::initialize ( void )
        !            35: {
        !            36:     firstItem = NULL;
        !            37:     length = 0;
        !            38: }
        !            39: 
        !            40: //*********************************************************************************
        !            41: // addToList
        !            42: //
        !            43: //*********************************************************************************
        !            44: 
        !            45: IOReturn IOPMinformeeList::addToList ( IOPMinformee * newInformee )
        !            46: {
        !            47:     IOPMinformee * nextInformee;
        !            48:     nextInformee = firstItem;                          // Is new object already in the list?
        !            49:     while (  nextInformee != NULL ) {
        !            50:         if ( nextInformee->whatObject == newInformee->whatObject ) {
        !            51:             return IOPMNoErr;                          // yes, just return
        !            52:         }
        !            53:         nextInformee = nextInList(nextInformee);
        !            54:     }
        !            55:     newInformee->nextInList = firstItem;               // add it to list
        !            56:     firstItem = newInformee;
        !            57:     length += 1;
        !            58:     return IOPMNoErr;
        !            59: }
        !            60: 
        !            61: 
        !            62: //*********************************************************************************
        !            63: // firstInList
        !            64: //
        !            65: //*********************************************************************************
        !            66: 
        !            67: IOPMinformee * IOPMinformeeList::firstInList ( void )
        !            68: {
        !            69:     return firstItem;
        !            70: }
        !            71: 
        !            72: //*********************************************************************************
        !            73: // nextInList
        !            74: //
        !            75: //*********************************************************************************
        !            76: 
        !            77: IOPMinformee * IOPMinformeeList::nextInList ( IOPMinformee * currentItem )
        !            78: {
        !            79:     if ( currentItem != NULL ) {
        !            80:        return (currentItem->nextInList);
        !            81:     }
        !            82:     return NULL;
        !            83: }
        !            84: 
        !            85: //*********************************************************************************
        !            86: // numberOfItems
        !            87: //
        !            88: //*********************************************************************************
        !            89: 
        !            90: unsigned long IOPMinformeeList::numberOfItems ( void )
        !            91: {
        !            92:     return length;
        !            93: }
        !            94: 
        !            95: //*********************************************************************************
        !            96: // findItem
        !            97: //
        !            98: // Look through the list for the one which points to the object identified
        !            99: // by the parameter.  Return a pointer to the list item or NULL.
        !           100: //*********************************************************************************
        !           101: 
        !           102: IOPMinformee * IOPMinformeeList::findItem ( IOService * driverOrChild )
        !           103: {
        !           104:     IOPMinformee * nextObject;
        !           105: 
        !           106:     nextObject = firstInList();
        !           107:     while (  nextObject != NULL ) {
        !           108:         if ( nextObject->whatObject == driverOrChild ) {
        !           109:             return nextObject;
        !           110:         }
        !           111:         nextObject = nextInList(nextObject);
        !           112:     }
        !           113:     return NULL;
        !           114: }
        !           115: 
        !           116: 
        !           117: //*********************************************************************************
        !           118: // removeFromList
        !           119: //
        !           120: // Find the item in the list, unlink it, and free it.
        !           121: //*********************************************************************************
        !           122: 
        !           123: IOReturn IOPMinformeeList::removeFromList ( IOService * theItem )
        !           124: {
        !           125:     IOPMinformee * item = firstItem;
        !           126:     IOPMinformee * temp;
        !           127: 
        !           128:     if ( item != NULL ) {
        !           129:         if ( item->whatObject == theItem ) {
        !           130:             firstItem = item->nextInList;
        !           131:             length--;
        !           132:             item->release();
        !           133:             return IOPMNoErr;
        !           134:         }
        !           135:         while ( item->nextInList != NULL ) {
        !           136:             if ( item->nextInList->whatObject == theItem ) {
        !           137:                 temp = item->nextInList;
        !           138:                 item->nextInList = temp->nextInList;
        !           139:                 length--;
        !           140:                 temp->release();
        !           141:                 return IOPMNoErr;
        !           142:             }
        !           143:             item = item->nextInList;
        !           144:         }
        !           145:     }
        !           146:     return IOPMNoErr;
        !           147: }
        !           148: 
        !           149: 
        !           150: //*********************************************************************************
        !           151: // free
        !           152: //
        !           153: // Free all items in the list, and then free the list itself
        !           154: //*********************************************************************************
        !           155: 
        !           156: void IOPMinformeeList::free (void )
        !           157: {
        !           158:     IOPMinformee * next = firstItem;
        !           159: 
        !           160:     while ( next != NULL ) {
        !           161:         firstItem = next->nextInList;
        !           162:         length--;
        !           163:         next->release();
        !           164:         next = firstItem;        
        !           165:     }
        !           166: super::free();
        !           167: }
        !           168: 

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