1 /* 2 * Copyright (c) 1998-2000, 2009 Apple 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 Copyright (c) 1998 Apple Computer, Inc. All rights reserved. 30 31 HISTORY 32 1998-7-13 Godfrey van der Linden(gvdl) 33 Created. 34 ]*/ 35 #include <IOKit/IOLib.h> 36 37 #include <IOKit/IOEventSource.h> 38 #include <IOKit/IOWorkLoop.h> 39 40 #define super OSObject 41 42 OSDefineMetaClassAndAbstractStructors(IOEventSource, OSObject) 43 44 OSMetaClassDefineReservedUnused(IOEventSource, 0); 45 OSMetaClassDefineReservedUnused(IOEventSource, 1); 46 OSMetaClassDefineReservedUnused(IOEventSource, 2); 47 OSMetaClassDefineReservedUnused(IOEventSource, 3); 48 OSMetaClassDefineReservedUnused(IOEventSource, 4); 49 OSMetaClassDefineReservedUnused(IOEventSource, 5); 50 OSMetaClassDefineReservedUnused(IOEventSource, 6); 51 OSMetaClassDefineReservedUnused(IOEventSource, 7); 52 53 bool IOEventSource::checkForWork() { return false; } 54 55 /* inline function implementations */ 56 57 #if IOKITSTATS 58 59 #define IOStatisticsRegisterCounter() \ 60 do { \ 61 reserved->counter = IOStatistics::registerEventSource(inOwner); \ 62 } while (0) 63 64 #define IOStatisticsUnregisterCounter() \ 65 do { \ 66 if (reserved) \ 67 IOStatistics::unregisterEventSource(reserved->counter); \ 68 } while (0) 69 70 #define IOStatisticsOpenGate() \ 71 do { \ 72 IOStatistics::countOpenGate(reserved->counter); \ 73 } while (0) 74 75 #define IOStatisticsCloseGate() \ 76 do { \ 77 IOStatistics::countCloseGate(reserved->counter); \ 78 } while (0) 79 80 #else 81 82 #define IOStatisticsRegisterCounter() 83 #define IOStatisticsUnregisterCounter() 84 #define IOStatisticsOpenGate() 85 #define IOStatisticsCloseGate() 86 87 #endif /* IOKITSTATS */ 88 89 void IOEventSource::signalWorkAvailable() 90 { 91 workLoop->signalWorkAvailable(); 92 } 93 94 void IOEventSource::openGate() 95 { 96 IOStatisticsOpenGate(); 97 workLoop->openGate(); 98 } 99 100 void IOEventSource::closeGate() 101 { 102 workLoop->closeGate(); 103 IOStatisticsCloseGate(); 104 } 105 106 bool IOEventSource::tryCloseGate() 107 { 108 bool res; 109 if ((res = workLoop->tryCloseGate())) { 110 IOStatisticsCloseGate(); 111 } 112 return res; 113 } 114 115 int IOEventSource::sleepGate(void *event, UInt32 type) 116 { 117 int res; 118 IOStatisticsOpenGate(); 119 res = workLoop->sleepGate(event, type); 120 IOStatisticsCloseGate(); 121 return res; 122 } 123 124 int IOEventSource::sleepGate(void *event, AbsoluteTime deadline, UInt32 type) 125 { 126 int res; 127 IOStatisticsOpenGate(); 128 res = workLoop->sleepGate(event, deadline, type); 129 IOStatisticsCloseGate(); 130 return res; 131 } 132 133 void IOEventSource::wakeupGate(void *event, bool oneThread) { workLoop->wakeupGate(event, oneThread); } 134 135 136 bool IOEventSource::init(OSObject *inOwner, 137 Action inAction) 138 { 139 if (!inOwner) 140 return false; 141 142 owner = inOwner; 143 144 if ( !super::init() ) 145 return false; 146 147 (void) setAction(inAction); 148 enabled = true; 149 150 if(!reserved) { 151 reserved = IONew(ExpansionData, 1); 152 if (!reserved) { 153 return false; 154 } 155 } 156 157 IOStatisticsRegisterCounter(); 158 159 return true; 160 } 161 162 void IOEventSource::free( void ) 163 { 164 IOStatisticsUnregisterCounter(); 165 166 if (reserved) 167 IODelete(reserved, ExpansionData, 1); 168 169 super::free(); 170 } 171 172 IOEventSource::Action IOEventSource::getAction () const { return action; }; 173 174 void IOEventSource::setAction(Action inAction) 175 { 176 action = inAction; 177 } 178 179 IOEventSource *IOEventSource::getNext() const { return eventChainNext; }; 180 181 void IOEventSource::setNext(IOEventSource *inNext) 182 { 183 eventChainNext = inNext; 184 } 185 186 void IOEventSource::enable() 187 { 188 enabled = true; 189 if (workLoop) 190 return signalWorkAvailable(); 191 } 192 193 void IOEventSource::disable() 194 { 195 enabled = false; 196 } 197 198 bool IOEventSource::isEnabled() const 199 { 200 return enabled; 201 } 202 203 void IOEventSource::setWorkLoop(IOWorkLoop *inWorkLoop) 204 { 205 if ( !inWorkLoop ) 206 disable(); 207 workLoop = inWorkLoop; 208 } 209 210 IOWorkLoop *IOEventSource::getWorkLoop() const 211 { 212 return workLoop; 213 } 214 215 bool IOEventSource::onThread() const 216 { 217 return (workLoop != 0) && workLoop->onThread(); 218 } 219