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Annotation of driverkit/Examples/IOStub/IOStub.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: /*     IOStub.h        1.0     01/29/91        (c) 1991 NeXT   
                     25:  *
                     26:  * IOStub.h - Interface for trivial I/O device subclass.
                     27:  *
                     28:  * HISTORY
                     29:  * 29-Jan-91    Doug Mitchell at NeXT
                     30:  *      Created. 
                     31:  */
                     32:  
                     33: #import <driverkit/return.h>
                     34: #import <mach/mach.h>
                     35: #import <mach/vm_param.h>
                     36: #import <driverkit/IODisk.h>
                     37: #import <driverkit/IODiskRwDistributed.h>
                     38: #import <driverkit/generalFuncs.h>
                     39: #import <kernserv/queue.h>
                     40: 
                     41: #define        SUPPORT_ASYNC   0
                     42: 
                     43: @interface IOStub: IODisk<IODiskReadingAndWriting, DiskRwDistributed>
                     44: {
                     45:        char            *stub_data;     // read/write data
                     46:        id              ioQLock;        // NXConditionLock. Protects ioQueue;
                     47:                                        //    I/O thread sleeps on this.
                     48:        queue_head_t    ioQueue;        // queue of IOBuf's
                     49: }
                     50: 
                     51: /* 
                     52:  * Condition variable states for  ioQLock.
                     53:  */
                     54: #define NO_WORK_AVAILABLE      0
                     55: #define WORK_AVAILABLE         1
                     56: 
                     57: /*
                     58:  * Init and free instances.
                     59:  */
                     60: - initStub : (int)unitNum;
                     61: - free;
                     62: 
                     63: @end

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