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Annotation of driverkit/libDriver/Kernel/IONetbufQueue.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:  * Copyright (c) 1993 NeXT Computer, Inc.
        !            26:  *
        !            27:  * Class which implements queues of Netbufs.
        !            28:  *
        !            29:  * HISTORY
        !            30:  *
        !            31:  * 2 Feb 1993 David E. Bohman at NeXT
        !            32:  *     Created.
        !            33:  */
        !            34:  
        !            35: #ifdef KERNEL
        !            36: 
        !            37: #import <driverkit/IONetbufQueue.h>
        !            38: 
        !            39: @implementation IONetbufQueue
        !            40: 
        !            41: - init
        !            42: {
        !            43:     return [self initWithMaxCount:16];
        !            44: }
        !            45: 
        !            46: - initWithMaxCount:(unsigned)maxCount
        !            47: {
        !            48:     [super init];
        !            49: 
        !            50:     _queueHead = _queueTail = 0;
        !            51:     _queueCount = 0; _maxCount = maxCount;
        !            52:     
        !            53:     return self;
        !            54: }
        !            55: 
        !            56: - free
        !            57: {
        !            58:     netbuf_t   nb;
        !            59:     
        !            60:     while (nb = [self dequeue])
        !            61:        nb_free(nb);
        !            62:        
        !            63:     return [super free];
        !            64: }
        !            65: 
        !            66: - (unsigned)count
        !            67: {
        !            68:     return (_queueCount);
        !            69: }
        !            70: 
        !            71: - (unsigned)maxCount
        !            72: {
        !            73:     return (_maxCount);
        !            74: }
        !            75: 
        !            76: - (void)enqueue:(netbuf_t)nb
        !            77: {
        !            78:     struct _queueEntry *qe = (struct _queueEntry *)nb;
        !            79: 
        !            80:     if (_queueCount < _maxCount) {
        !            81:        if (_queueCount++ > 0) {
        !            82:            _queueTail->_next = qe; _queueTail = qe;
        !            83:        }
        !            84:        else
        !            85:            _queueHead = _queueTail = qe;
        !            86: 
        !            87:        qe->_next = 0;
        !            88:     }
        !            89:     else
        !            90:        nb_free(nb);
        !            91: }
        !            92: 
        !            93: - (netbuf_t)dequeue
        !            94: {
        !            95:     struct _queueEntry *qe;
        !            96: 
        !            97:     if (_queueCount > 0) {
        !            98:        qe = _queueHead; _queueHead = qe->_next;
        !            99:        if (--_queueCount == 0)
        !           100:            _queueHead = _queueTail = 0;
        !           101:            
        !           102:        qe->_next = 0;
        !           103:     }
        !           104:     else
        !           105:        qe = 0;
        !           106:        
        !           107:     return ((netbuf_t)qe);
        !           108: }
        !           109: 
        !           110: @end
        !           111: 
        !           112: #endif KERNEL

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