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Annotation of driverkit/Examples/IOStub/IOStubThread.h, revision 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: /*     IOStubThread.h          1.0     02/07/91        (c) 1991 NeXT   
        !            25:  *
        !            26:  * IOStubThread.h - IOStub device thread support.
        !            27:  *
        !            28:  * HISTORY
        !            29:  * 07-Feb-91    Doug Mitchell at NeXT
        !            30:  *      Created.
        !            31:  */
        !            32: 
        !            33: #ifndef        _IOSTUB_THREAD_
        !            34: #define _IOSTUB_THREAD_
        !            35: 
        !            36: #import <driverkit/return.h>
        !            37: #import <objc/objc.h>
        !            38: #import <mach/cthreads.h>
        !            39: #import <kernserv/queue.h>
        !            40: #import "IOStub.h"
        !            41: 
        !            42: /*
        !            43:  * Operations performed by IOStub's I/O thread.
        !            44:  */
        !            45: typedef enum {
        !            46:        STUB_READ, 
        !            47:        STUB_WRITE, 
        !            48:        STUB_ZERO, 
        !            49:        STUB_ABORT
        !            50: } stub_cmd_t;
        !            51: 
        !            52: /*
        !            53:  * Representation of one I/O. This is generated by the device's exported
        !            54:  * methods and enqueued on IOQueue to be serviced by the I/O thread.
        !            55:  */
        !            56: typedef struct {
        !            57: 
        !            58:        stub_cmd_t      cmd;            /* op to perform */
        !            59:        unsigned        offset;         /* block # */
        !            60:        unsigned        bytesReq;       /* bytes to move */
        !            61:        void            *buf;           /* where to r/w */
        !            62:        unsigned        *bytesXfr;      /* bytes actually moved (RETURNED) */
        !            63:        IOReturn        status;         /* result (RETURNED) */
        !            64:        void            *pending;       /* if non-zero, async request; this is
        !            65:                                         * used to ioComplete: the operation.
        !            66:                                         */
        !            67:        id              waitLock;       /* NXConditionLock. Sync I/O waits on 
        !            68:                                         * this. */
        !            69:        int             dirRead;        /* Written by command-specific code.
        !            70:                                         * Specifies direction of data 
        !            71:                                         * transfer. A hack which should go 
        !            72:                                         * away with RO support. */
        !            73:        queue_chain_t   link;           /* for linking on ioQueue */
        !            74:        
        !            75: } IOBuf_t;
        !            76: 
        !            77: @interface IOStub(Thread)
        !            78: 
        !            79: - (void)enqueueIoBuf : (IOBuf_t *)buf;
        !            80: - (IOBuf_t *)dequeueIoBuf;
        !            81: 
        !            82: @end
        !            83: 
        !            84: 
        !            85: extern void IOStub_thread(IOStub *stubId);
        !            86: 
        !            87: #endif _IOSTUB_THREAD_

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