iokit/Kernel/IOPMPowerStateQueue.cpp

   1 /*
   2  * Copyright (c) 2001-2002 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,
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  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
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  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include "IOPMPowerStateQueue.h"
  30
  31 #define super IOEventSource
  32 OSDefineMetaClassAndStructors( IOPMPowerStateQueue, IOEventSource )
  33
  34 IOPMPowerStateQueue * IOPMPowerStateQueue::PMPowerStateQueue(
  35         OSObject * inOwner, Action inAction )
  36 {
  37         IOPMPowerStateQueue * me = new IOPMPowerStateQueue;
  38
  39         if (me && !me->init(inOwner, inAction)) {
  40                 me->release();
  41                 return NULL;
  42         }
  43
  44         return me;
  45 }
  46
  47 bool
  48 IOPMPowerStateQueue::init( OSObject * inOwner, Action inAction )
  49 {
  50         if (!inAction || !(super::init(inOwner, inAction))) {
  51                 return false;
  52         }
  53
  54         queue_init( &queueHead );
  55
  56         queueLock = IOLockAlloc();
  57         if (!queueLock) {
  58                 return false;
  59         }
  60
  61         return true;
  62 }
  63
  64 bool
  65 IOPMPowerStateQueue::submitPowerEvent(
  66         uint32_t eventType,
  67         void *   arg0,
  68         uint64_t arg1 )
  69 {
  70         PowerEventEntry * entry;
  71
  72         entry = IONew(PowerEventEntry, 1);
  73         if (!entry) {
  74                 return false;
  75         }
  76
  77         entry->eventType = eventType;
  78         entry->arg0 = arg0;
  79         entry->arg1 = arg1;
  80
  81         IOLockLock(queueLock);
  82         queue_enter(&queueHead, entry, PowerEventEntry *, chain);
  83         IOLockUnlock(queueLock);
  84         signalWorkAvailable();
  85
  86         return true;
  87 }
  88
  89 bool
  90 IOPMPowerStateQueue::checkForWork( void )
  91 {
  92         IOPMPowerStateQueueAction queueAction = (IOPMPowerStateQueueAction) action;
  93         PowerEventEntry * entry;
  94
  95         IOLockLock(queueLock);
  96         while (!queue_empty(&queueHead)) {
  97                 queue_remove_first(&queueHead, entry, PowerEventEntry *, chain);
  98                 IOLockUnlock(queueLock);
  99
 100                 (*queueAction)(owner, entry->eventType, entry->arg0, entry->arg1);
 101                 IODelete(entry, PowerEventEntry, 1);
 102
 103                 IOLockLock(queueLock);
 104         }
 105         IOLockUnlock(queueLock);
 106
 107         return false;
 108 }