iokit/Kernel/IOEventSource.cpp

   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 /*
  23 Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
  24
  25 HISTORY
  26     1998-7-13   Godfrey van der Linden(gvdl)
  27         Created.
  28 ]*/
  29 #include <IOKit/IOLib.h>
  30
  31 #include <IOKit/IOEventSource.h>
  32 #include <IOKit/IOWorkLoop.h>
  33
  34 #define super OSObject
  35
  36 OSDefineMetaClassAndAbstractStructors(IOEventSource, OSObject)
  37 OSMetaClassDefineReservedUnused(IOEventSource, 0);
  38 OSMetaClassDefineReservedUnused(IOEventSource, 1);
  39 OSMetaClassDefineReservedUnused(IOEventSource, 2);
  40 OSMetaClassDefineReservedUnused(IOEventSource, 3);
  41 OSMetaClassDefineReservedUnused(IOEventSource, 4);
  42 OSMetaClassDefineReservedUnused(IOEventSource, 5);
  43 OSMetaClassDefineReservedUnused(IOEventSource, 6);
  44 OSMetaClassDefineReservedUnused(IOEventSource, 7);
  45
  46 bool IOEventSource::init(OSObject *inOwner,
  47                          Action inAction = 0)
  48 {
  49     if (!inOwner)
  50         return false;
  51
  52     owner = inOwner;
  53
  54     if ( !super::init() )
  55         return false;
  56
  57     (void) setAction(inAction);
  58     enabled = true;
  59
  60     return true;
  61 }
  62
  63 IOEventSource::Action IOEventSource::getAction () const { return action; };
  64
  65 void IOEventSource::setAction(Action inAction)
  66 {
  67     action = inAction;
  68 }
  69
  70 IOEventSource *IOEventSource::getNext() const { return eventChainNext; };
  71
  72 void IOEventSource::setNext(IOEventSource *inNext)
  73 {
  74     eventChainNext = inNext;
  75 }
  76
  77 void IOEventSource::enable()
  78 {
  79     enabled = true;
  80     if (workLoop)
  81         return signalWorkAvailable();
  82 }
  83
  84 void IOEventSource::disable()
  85 {
  86     enabled = false;
  87 }
  88
  89 bool IOEventSource::isEnabled() const
  90 {
  91     return enabled;
  92 }
  93
  94 void IOEventSource::setWorkLoop(IOWorkLoop *inWorkLoop)
  95 {
  96     if ( !inWorkLoop )
  97         disable();
  98     workLoop = inWorkLoop;
  99 }
 100
 101 IOWorkLoop *IOEventSource::getWorkLoop() const
 102 {
 103     return workLoop;
 104 }
 105
 106 bool IOEventSource::onThread() const
 107 {
 108     return (workLoop != 0) && workLoop->onThread();
 109 }