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Annotation of driverkit/libDriver/Kernel/AudioCommand.m, 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: 
        !            25: #import "AudioCommand.h"
        !            26: #import <driverkit/IOAudioPrivate.h>           // AD_CMD_MSG_SYNCHRONOUS
        !            27: 
        !            28: #import <mach/message.h>               // msg_header_t
        !            29: #import <machkit/NXLock.h>
        !            30: #import <driverkit/kernelDriver.h>
        !            31:  
        !            32: /*
        !            33:  * FIXME: This is from <kern/ipc_basics.h>, which can't be
        !            34:  * imported because of a conflict with <mach/mach_types.h>
        !            35:  */
        !            36: extern msg_return_t msg_send_from_kernel();
        !            37: 
        !            38: @implementation AudioCommand
        !            39: 
        !            40: - initPort:(port_t)port
        !            41: {
        !            42:     [super init];
        !            43: 
        !            44:     interLock = [[NXConditionLock alloc] initWith:AUDIO_COMMAND_IDLE];
        !            45:     driverPort_kern = port;
        !            46:     return self;
        !            47: }
        !            48: 
        !            49: - free
        !            50: {
        !            51:     [interLock free];
        !            52:     return [super free];
        !            53: }
        !            54: 
        !            55: - (ADCommand) command
        !            56: {
        !            57:     return (command);
        !            58: }
        !            59: 
        !            60: - (void)done:(int)_ret
        !            61: {
        !            62:     if ([interLock condition] == AUDIO_COMMAND_BUSY) {
        !            63:        [interLock lock];
        !            64:        ret = _ret;
        !            65:        [interLock unlockWith:AUDIO_COMMAND_DONE];
        !            66:     }
        !            67: 
        !            68: }
        !            69: 
        !            70: - (int)send:(ADCommand)_command
        !            71: {
        !            72:     msg_header_t       msg = { 0 };
        !            73:     int                        result = 0;
        !            74:  
        !            75:  
        !            76:      [interLock lockWhen:AUDIO_COMMAND_IDLE];
        !            77:         
        !            78:     command = _command;
        !            79:     
        !            80:     msg.msg_size = sizeof (msg);
        !            81:     msg.msg_remote_port = driverPort_kern;
        !            82:     msg.msg_id =  AD_CMD_MSG_SYNCHRONOUS;
        !            83:     
        !            84:     [interLock unlockWith:AUDIO_COMMAND_BUSY];
        !            85:     
        !            86:     result = msg_send_from_kernel(&msg, SEND_TIMEOUT, 1000);
        !            87:     if (result == SEND_SUCCESS) {
        !            88:        [interLock lockWhen:AUDIO_COMMAND_DONE];
        !            89:        result = ret;
        !            90:     }
        !            91:     else
        !            92:        [interLock lock];
        !            93:     
        !            94:     [interLock unlockWith:AUDIO_COMMAND_IDLE];
        !            95:     
        !            96:     return (result);
        !            97: 
        !            98: }
        !            99: 
        !           100: @end

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