iokit/Kernel/IOCommand.cpp

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 /*
  27  *
  28  *      Copyright (c) 2000 Apple Computer, Inc.  All rights reserved.
  29  *
  30  *      HISTORY
  31  *
  32  *      11/13/2000              CJS             Created IOCommand class and implementation
  33  *
  34  */
  35
  36 #include <IOKit/IOCommand.h>
  37
  38 #define super OSObject
  39 OSDefineMetaClassAndAbstractStructors(IOCommand, OSObject);
  40
  41
  42 //--------------------------------------------------------------------------
  43 //      init -  initialize our data structures
  44 //--------------------------------------------------------------------------
  45
  46 bool IOCommand::init(void)
  47 {
  48     if (super::init()) {
  49         queue_init(&fCommandChain);
  50         return true;
  51     }
  52     else
  53         return false;
  54 }