iokit/Kernel/IOEventSource.cpp

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24 Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
  25
  26 HISTORY
  27     1998-7-13   Godfrey van der Linden(gvdl)
  28         Created.
  29 ]*/
  30 #include <IOKit/IOLib.h>
  31
  32 #include <IOKit/IOEventSource.h>
  33 #include <IOKit/IOWorkLoop.h>
  34
  35 #define super OSObject
  36
  37 OSDefineMetaClassAndAbstractStructors(IOEventSource, OSObject)
  38 OSMetaClassDefineReservedUnused(IOEventSource, 0);
  39 OSMetaClassDefineReservedUnused(IOEventSource, 1);
  40 OSMetaClassDefineReservedUnused(IOEventSource, 2);
  41 OSMetaClassDefineReservedUnused(IOEventSource, 3);
  42 OSMetaClassDefineReservedUnused(IOEventSource, 4);
  43 OSMetaClassDefineReservedUnused(IOEventSource, 5);
  44 OSMetaClassDefineReservedUnused(IOEventSource, 6);
  45 OSMetaClassDefineReservedUnused(IOEventSource, 7);
  46
  47 /* inline function implementations */
  48 void IOEventSource::signalWorkAvailable()       { workLoop->signalWorkAvailable(); }
  49 void IOEventSource::openGate()                  { workLoop->openGate(); }
  50 void IOEventSource::closeGate()                 { workLoop->closeGate(); }
  51 bool IOEventSource::tryCloseGate()              { return workLoop->tryCloseGate(); }
  52 int IOEventSource::sleepGate(void *event, UInt32 type)
  53         { return workLoop->sleepGate(event, type); }
  54 void IOEventSource::wakeupGate(void *event, bool oneThread)
  55         { workLoop->wakeupGate(event, oneThread); }
  56
  57 bool IOEventSource::init(OSObject *inOwner,
  58                          Action inAction)
  59 {
  60     if (!inOwner)
  61         return false;
  62
  63     owner = inOwner;
  64
  65     if ( !super::init() )
  66         return false;
  67
  68     (void) setAction(inAction);
  69     enabled = true;
  70
  71     return true;
  72 }
  73
  74 IOEventSource::Action IOEventSource::getAction () const { return action; };
  75
  76 void IOEventSource::setAction(Action inAction)
  77 {
  78     action = inAction;
  79 }
  80
  81 IOEventSource *IOEventSource::getNext() const { return eventChainNext; };
  82
  83 void IOEventSource::setNext(IOEventSource *inNext)
  84 {
  85     eventChainNext = inNext;
  86 }
  87
  88 void IOEventSource::enable()
  89 {
  90     enabled = true;
  91     if (workLoop)
  92         return signalWorkAvailable();
  93 }
  94
  95 void IOEventSource::disable()
  96 {
  97     enabled = false;
  98 }
  99
 100 bool IOEventSource::isEnabled() const
 101 {
 102     return enabled;
 103 }
 104
 105 void IOEventSource::setWorkLoop(IOWorkLoop *inWorkLoop)
 106 {
 107     if ( !inWorkLoop )
 108         disable();
 109     workLoop = inWorkLoop;
 110 }
 111
 112 IOWorkLoop *IOEventSource::getWorkLoop() const
 113 {
 114     return workLoop;
 115 }
 116
 117 bool IOEventSource::onThread() const
 118 {
 119     return (workLoop != 0) && workLoop->onThread();
 120 }