iokit/Kernel/IOEventSource.cpp

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31 Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
  32
  33 HISTORY
  34     1998-7-13   Godfrey van der Linden(gvdl)
  35         Created.
  36 ]*/
  37 #include <IOKit/IOLib.h>
  38
  39 #include <IOKit/IOEventSource.h>
  40 #include <IOKit/IOWorkLoop.h>
  41
  42 #define super OSObject
  43
  44 OSDefineMetaClassAndAbstractStructors(IOEventSource, OSObject)
  45 OSMetaClassDefineReservedUnused(IOEventSource, 0);
  46 OSMetaClassDefineReservedUnused(IOEventSource, 1);
  47 OSMetaClassDefineReservedUnused(IOEventSource, 2);
  48 OSMetaClassDefineReservedUnused(IOEventSource, 3);
  49 OSMetaClassDefineReservedUnused(IOEventSource, 4);
  50 OSMetaClassDefineReservedUnused(IOEventSource, 5);
  51 OSMetaClassDefineReservedUnused(IOEventSource, 6);
  52 OSMetaClassDefineReservedUnused(IOEventSource, 7);
  53
  54 /* inline function implementations */
  55 void IOEventSource::signalWorkAvailable()       { workLoop->signalWorkAvailable(); }
  56 void IOEventSource::openGate()                  { workLoop->openGate(); }
  57 void IOEventSource::closeGate()                 { workLoop->closeGate(); }
  58 bool IOEventSource::tryCloseGate()              { return workLoop->tryCloseGate(); }
  59 int IOEventSource::sleepGate(void *event, UInt32 type)
  60         { return workLoop->sleepGate(event, type); }
  61 void IOEventSource::wakeupGate(void *event, bool oneThread)
  62         { workLoop->wakeupGate(event, oneThread); }
  63
  64 bool IOEventSource::init(OSObject *inOwner,
  65                          Action inAction)
  66 {
  67     if (!inOwner)
  68         return false;
  69
  70     owner = inOwner;
  71
  72     if ( !super::init() )
  73         return false;
  74
  75     (void) setAction(inAction);
  76     enabled = true;
  77
  78     return true;
  79 }
  80
  81 IOEventSource::Action IOEventSource::getAction () const { return action; };
  82
  83 void IOEventSource::setAction(Action inAction)
  84 {
  85     action = inAction;
  86 }
  87
  88 IOEventSource *IOEventSource::getNext() const { return eventChainNext; };
  89
  90 void IOEventSource::setNext(IOEventSource *inNext)
  91 {
  92     eventChainNext = inNext;
  93 }
  94
  95 void IOEventSource::enable()
  96 {
  97     enabled = true;
  98     if (workLoop)
  99         return signalWorkAvailable();
 100 }
 101
 102 void IOEventSource::disable()
 103 {
 104     enabled = false;
 105 }
 106
 107 bool IOEventSource::isEnabled() const
 108 {
 109     return enabled;
 110 }
 111
 112 void IOEventSource::setWorkLoop(IOWorkLoop *inWorkLoop)
 113 {
 114     if ( !inWorkLoop )
 115         disable();
 116     workLoop = inWorkLoop;
 117 }
 118
 119 IOWorkLoop *IOEventSource::getWorkLoop() const
 120 {
 121     return workLoop;
 122 }
 123
 124 bool IOEventSource::onThread() const
 125 {
 126     return (workLoop != 0) && workLoop->onThread();
 127 }