iokit/Kernel/IOEventSource.cpp

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26 Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
  27
  28 HISTORY
  29     1998-7-13   Godfrey van der Linden(gvdl)
  30         Created.
  31 ]*/
  32 #include <IOKit/IOLib.h>
  33
  34 #include <IOKit/IOEventSource.h>
  35 #include <IOKit/IOWorkLoop.h>
  36
  37 #define super OSObject
  38
  39 OSDefineMetaClassAndAbstractStructors(IOEventSource, OSObject)
  40 OSMetaClassDefineReservedUnused(IOEventSource, 0);
  41 OSMetaClassDefineReservedUnused(IOEventSource, 1);
  42 OSMetaClassDefineReservedUnused(IOEventSource, 2);
  43 OSMetaClassDefineReservedUnused(IOEventSource, 3);
  44 OSMetaClassDefineReservedUnused(IOEventSource, 4);
  45 OSMetaClassDefineReservedUnused(IOEventSource, 5);
  46 OSMetaClassDefineReservedUnused(IOEventSource, 6);
  47 OSMetaClassDefineReservedUnused(IOEventSource, 7);
  48
  49 /* inline function implementations */
  50 void IOEventSource::signalWorkAvailable()       { workLoop->signalWorkAvailable(); }
  51 void IOEventSource::openGate()                  { workLoop->openGate(); }
  52 void IOEventSource::closeGate()                 { workLoop->closeGate(); }
  53 bool IOEventSource::tryCloseGate()              { return workLoop->tryCloseGate(); }
  54 int IOEventSource::sleepGate(void *event, UInt32 type)
  55         { return workLoop->sleepGate(event, type); }
  56 void IOEventSource::wakeupGate(void *event, bool oneThread)
  57         { workLoop->wakeupGate(event, oneThread); }
  58
  59 bool IOEventSource::init(OSObject *inOwner,
  60                          Action inAction)
  61 {
  62     if (!inOwner)
  63         return false;
  64
  65     owner = inOwner;
  66
  67     if ( !super::init() )
  68         return false;
  69
  70     (void) setAction(inAction);
  71     enabled = true;
  72
  73     return true;
  74 }
  75
  76 IOEventSource::Action IOEventSource::getAction () const { return action; };
  77
  78 void IOEventSource::setAction(Action inAction)
  79 {
  80     action = inAction;
  81 }
  82
  83 IOEventSource *IOEventSource::getNext() const { return eventChainNext; };
  84
  85 void IOEventSource::setNext(IOEventSource *inNext)
  86 {
  87     eventChainNext = inNext;
  88 }
  89
  90 void IOEventSource::enable()
  91 {
  92     enabled = true;
  93     if (workLoop)
  94         return signalWorkAvailable();
  95 }
  96
  97 void IOEventSource::disable()
  98 {
  99     enabled = false;
 100 }
 101
 102 bool IOEventSource::isEnabled() const
 103 {
 104     return enabled;
 105 }
 106
 107 void IOEventSource::setWorkLoop(IOWorkLoop *inWorkLoop)
 108 {
 109     if ( !inWorkLoop )
 110         disable();
 111     workLoop = inWorkLoop;
 112 }
 113
 114 IOWorkLoop *IOEventSource::getWorkLoop() const
 115 {
 116     return workLoop;
 117 }
 118
 119 bool IOEventSource::onThread() const
 120 {
 121     return (workLoop != 0) && workLoop->onThread();
 122 }