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,
  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
  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     {
  41         me->release();
  42         return NULL;
  43     }
  44
  45     return me;
  46 }
  47
  48 bool IOPMPowerStateQueue::init( OSObject * inOwner, Action inAction )
  49 {
  50     if (!inAction || !(super::init(inOwner, inAction)))
  51         return false;
  52
  53     queue_init( &queueHead );
  54
  55     queueLock = IOLockAlloc();
  56     if (!queueLock)
  57         return false;
  58
  59     return true;
  60 }
  61
  62 bool IOPMPowerStateQueue::submitPowerEvent(
  63      uint32_t eventType,
  64      void *   arg0,
  65      void *   arg1 )
  66 {
  67     PowerEventEntry * entry;
  68
  69     entry = IONew(PowerEventEntry, 1);
  70     if (!entry)
  71         return false;
  72
  73     entry->eventType = eventType;
  74     entry->args[0]   = arg0;
  75     entry->args[1]   = arg1;
  76
  77     IOLockLock(queueLock);
  78     queue_enter(&queueHead, entry, PowerEventEntry *, chain);
  79     IOLockUnlock(queueLock);
  80     signalWorkAvailable();
  81
  82     return true;
  83 }
  84
  85 bool IOPMPowerStateQueue::checkForWork( void )
  86 {
  87     IOPMPowerStateQueueAction queueAction = (IOPMPowerStateQueueAction) action;
  88     PowerEventEntry * entry;
  89
  90         IOLockLock(queueLock);
  91         while (!queue_empty(&queueHead))
  92         {
  93                 queue_remove_first(&queueHead, entry, PowerEventEntry *, chain);
  94                 IOLockUnlock(queueLock);
  95
  96         (*queueAction)(owner, entry->eventType, entry->args[0], entry->args[1]);
  97         IODelete(entry, PowerEventEntry, 1);
  98
  99         IOLockLock(queueLock);
 100         }
 101         IOLockUnlock(queueLock);
 102
 103     return false;
 104 }