1/* 2 File: AppleSCSIEmulatorEventSource.cpp 3 4 Contains: 5 6 Version: 1.0.0 7 8 Copyright: Copyright (c) 2007 by Apple Inc., All Rights Reserved. 9 10Disclaimer:IMPORTANT: This Apple software is supplied to you by Apple Inc. 11("Apple") in consideration of your agreement to the following terms, and your use, 12installation, modification or redistribution of this Apple software constitutes acceptance 13of these terms. 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Except as expressly stated in this notice, no 26other rights or licenses, express or implied, are granted by Apple herein, 27including but not limited to any patent rights that may be infringed by your derivative 28works or by other works in which the Apple Software may be incorporated. 29 30The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO WARRANTIES, 31EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, 32MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE 33OR ITS USE AND OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. IN NO EVENT SHALL APPLE 34BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 35NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 36OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, 37REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED 38AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT 39LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40*/ 41 42 43//----------------------------------------------------------------------------- 44// Includes 45//----------------------------------------------------------------------------- 46 47#include "DebugSupport.h" 48#include "AppleSCSIEmulatorEventSource.h" 49#include "AppleSCSIEmulatorAdapter.h" 50 51 52// Define superclass 53#define super IOEventSource 54OSDefineMetaClassAndStructors ( AppleSCSIEmulatorEventSource, IOEventSource ) 55 56 57//----------------------------------------------------------------------------- 58// Create 59//----------------------------------------------------------------------------- 60 61AppleSCSIEmulatorEventSource * 62AppleSCSIEmulatorEventSource::Create ( OSObject * owner, Action action ) 63{ 64 65 AppleSCSIEmulatorEventSource * es = NULL; 66 bool result = false; 67 68 es = OSTypeAlloc ( AppleSCSIEmulatorEventSource ); 69 require_nonzero ( es, ErrorExit ); 70 71 result = es->Init ( owner, action ); 72 require ( result, ReleaseEventSource ); 73 74 return es; 75 76 77ReleaseEventSource: 78 79 80 es->release ( ); 81 82 83ErrorExit: 84 85 86 return NULL; 87 88} 89 90 91//----------------------------------------------------------------------------- 92// Init 93//----------------------------------------------------------------------------- 94 95bool 96AppleSCSIEmulatorEventSource::Init ( OSObject * owner, Action action ) 97{ 98 99 bool result = false; 100 101 // Initialize the queue head. 102 queue_init ( &fResponderQueue ); 103 104 fLock = IOSimpleLockAlloc ( ); 105 if ( fLock != NULL ) 106 { 107 108 // Call the superclass. 109 result = super::init ( owner, ( IOEventSource::Action ) action ); 110 111 } 112 113 return result; 114 115} 116 117 118//----------------------------------------------------------------------------- 119// AddItemToQueue 120//----------------------------------------------------------------------------- 121 122void 123AppleSCSIEmulatorEventSource::AddItemToQueue ( SCSIEmulatorRequestBlock * srb ) 124{ 125 126 // Take the lock to protect the queue. 127 IOSimpleLockLock ( fLock ); 128 129 // Add the item to the queue. 130 queue_enter ( &fResponderQueue, srb, SCSIEmulatorRequestBlock *, fQueueChain ); 131 132 // Drop the lock. 133 IOSimpleLockUnlock ( fLock ); 134 135 // Wakeup the thread since there's work to do... 136 signalWorkAvailable ( ); 137 138} 139 140 141//----------------------------------------------------------------------------- 142// RemoveItemFromQueue 143//----------------------------------------------------------------------------- 144 145SCSIEmulatorRequestBlock * 146AppleSCSIEmulatorEventSource::RemoveItemFromQueue ( void ) 147{ 148 149 SCSIEmulatorRequestBlock * srb = NULL; 150 151 // Take the lock to protect the queue. 152 IOSimpleLockLock ( fLock ); 153 154 if ( !queue_empty ( &fResponderQueue ) ) 155 { 156 157 // Remove the item to the queue. 158 queue_remove_first ( &fResponderQueue, srb, SCSIEmulatorRequestBlock *, fQueueChain ); 159 160 } 161 162 // Drop the lock. 163 IOSimpleLockUnlock ( fLock ); 164 165 return srb; 166 167} 168 169 170//----------------------------------------------------------------------------- 171// checkForWork 172//----------------------------------------------------------------------------- 173 174bool 175AppleSCSIEmulatorEventSource::checkForWork ( void ) 176{ 177 178 SCSIEmulatorRequestBlock * srb = NULL; 179 180 srb = RemoveItemFromQueue ( ); 181 while ( srb != NULL ) 182 { 183 184 // Complete it if it's non-NULL. 185 ( *action ) ( owner, srb->fParallelRequest ); 186 187 srb = RemoveItemFromQueue ( ); 188 189 } 190 191 return false; 192 193} 194