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Annotation of XNU/iokit/Families/IOSCSIParallel/queueHelpers.cpp, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  *
        !            24:  *     queueHelpers.cpp
        !            25:  *
        !            26:  */
        !            27: #include <IOKit/scsi/IOSCSIParallelInterface.h>
        !            28: 
        !            29: void IOSCSIParallelDevice::addCommand( queue_head_t *list, IOSCSIParallelCommand *scsiCmd )
        !            30: {
        !            31:     scsiCmd->list = list;
        !            32: 
        !            33:     queue_enter( list, scsiCmd, IOSCSIParallelCommand *, nextCommand );
        !            34: }
        !            35: 
        !            36: void IOSCSIParallelDevice::deleteCommand( queue_head_t *list, IOSCSIParallelCommand *scsiCmd, IOReturn rc = kIOReturnSuccess )
        !            37: {
        !            38:     scsiCmd->list = 0;
        !            39: 
        !            40:     if ( rc != kIOReturnSuccess )
        !            41:     {
        !            42:         if  ( scsiCmd->results.returnCode == kIOReturnSuccess )
        !            43:         {    
        !            44:             scsiCmd->results.returnCode = (IOReturn) rc;
        !            45:         }
        !            46:     }
        !            47:  
        !            48:     queue_remove( list, scsiCmd, IOSCSIParallelCommand *, nextCommand );
        !            49: }
        !            50: 
        !            51: IOSCSIParallelCommand *IOSCSIParallelDevice::checkCommand( queue_head_t *list )
        !            52: {
        !            53:     if ( queue_empty( list ) == true )
        !            54:     {
        !            55:         return 0;
        !            56:     }
        !            57: 
        !            58:     return (IOSCSIParallelCommand *)queue_first( list );
        !            59: }
        !            60: 
        !            61: 
        !            62: IOSCSIParallelCommand *IOSCSIParallelDevice::getCommand( queue_head_t *list )
        !            63: {
        !            64:     IOSCSIParallelCommand      *scsiCmd = 0;
        !            65: 
        !            66:     if ( queue_empty( list ) == false )
        !            67:     {
        !            68:         queue_remove_first( list, scsiCmd, IOSCSIParallelCommand *, nextCommand );
        !            69:         scsiCmd->list = 0;
        !            70:     }
        !            71: 
        !            72:     return scsiCmd;
        !            73: }
        !            74: 
        !            75: void IOSCSIParallelDevice::stackCommand( queue_head_t *list, IOSCSIParallelCommand *scsiCmd )
        !            76: {
        !            77:     scsiCmd->list = list;
        !            78: 
        !            79:     queue_enter_first( list, scsiCmd, IOSCSIParallelCommand *, nextCommand );
        !            80: }
        !            81: 
        !            82: void IOSCSIParallelDevice::moveCommand( queue_head_t *fromList, queue_head_t *toList, IOSCSIParallelCommand *scsiCmd, IOReturn rc = kIOReturnSuccess )
        !            83: {
        !            84:     if ( rc != kIOReturnSuccess )
        !            85:     {
        !            86:         if  ( scsiCmd->results.returnCode == kIOReturnSuccess )
        !            87:         {    
        !            88:             scsiCmd->results.returnCode = (IOReturn) rc;
        !            89:         }
        !            90:     }
        !            91: 
        !            92:     scsiCmd->list = toList;  
        !            93: 
        !            94:     queue_remove( fromList, scsiCmd, IOSCSIParallelCommand *, nextCommand );
        !            95:     queue_enter(  toList,   scsiCmd, IOSCSIParallelCommand *, nextCommand );
        !            96: }
        !            97: 
        !            98: void IOSCSIParallelDevice::moveAllCommands( queue_head_t *fromList, queue_head_t *toList, IOReturn rc = kIOReturnSuccess )
        !            99: {
        !           100:     IOSCSIParallelCommand              *scsiCmd;
        !           101: 
        !           102:     if ( queue_empty( fromList ) == true ) return;
        !           103: 
        !           104:     do
        !           105:     {
        !           106:         scsiCmd = (IOSCSIParallelCommand *)queue_first( fromList );
        !           107: 
        !           108:         if ( rc != kIOReturnSuccess )
        !           109:         {
        !           110:             if  ( scsiCmd->results.returnCode == kIOReturnSuccess )
        !           111:             {    
        !           112:                 scsiCmd->results.returnCode = (IOReturn) rc;
        !           113:             }
        !           114:         }
        !           115: 
        !           116:         scsiCmd->list = toList;  
        !           117: 
        !           118:         queue_remove( fromList, scsiCmd, IOSCSIParallelCommand *, nextCommand );
        !           119:         queue_enter(  toList,   scsiCmd, IOSCSIParallelCommand *, nextCommand );
        !           120: 
        !           121:     } while( queue_empty( fromList ) == false );
        !           122: }
        !           123: 
        !           124: bool IOSCSIParallelDevice::findCommand( queue_head_t *list, IOSCSIParallelCommand *findSCSICmd )
        !           125: {
        !           126:     IOSCSIParallelCommand              *scsiCmd;
        !           127: 
        !           128:     queue_iterate( list, scsiCmd, IOSCSIParallelCommand *, nextCommand )
        !           129:     {
        !           130:         if ( scsiCmd == findSCSICmd )
        !           131:         {
        !           132:             return true;
        !           133:         }
        !           134:     }
        !           135:     return false;
        !           136: }
        !           137:   
        !           138: void IOSCSIParallelDevice::purgeAllCommands( queue_head_t *list, IOReturn rc )
        !           139: {
        !           140:     IOSCSIParallelCommand              *scsiCmd;
        !           141: 
        !           142:     if ( queue_empty( list ) == true ) return;
        !           143: 
        !           144:     do
        !           145:     {
        !           146:         scsiCmd = (IOSCSIParallelCommand *)queue_first( list );
        !           147: 
        !           148:         deleteCommand( list, scsiCmd, rc );
        !           149:         finishCommand( scsiCmd );
        !           150: 
        !           151:     } while( queue_empty( list ) == false );
        !           152: }

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