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Annotation of driverkit/libDriver/Kernel/NXSpinLock.m, 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: /*     Copyright (c) 1991 NeXT Computer, Inc.  All rights reserved. 
                     25:  *
                     26:  * NXSpinLock.m. Cheap lock object, kernel version.
                     27:  *
                     28:  * HISTORY
                     29:  * 22-Apr-91    Doug Mitchell at NeXT
                     30:  *      Created. 
                     31:  */
                     32: 
                     33: #define KERNEL         1
                     34: #define KERNEL_PRIVATE 1
                     35: #define ARCH_PRIVATE   1 
                     36: 
                     37: #import <machkit/NXLock.h>
                     38: #import <kernserv/lock.h>
                     39: 
                     40: /*
                     41:  * _priv instance variable points to one of these.
                     42:  */
                     43: struct _priv {
                     44:     simple_lock_t              spin_lock;
                     45: };
                     46: 
                     47: @implementation NXSpinLock 
                     48: 
                     49: - init
                     50: {
                     51:        struct _priv    *p = _priv;
                     52:        
                     53:        [super init];
                     54: 
                     55:        if (p == 0) {   
                     56:            p = (struct _priv *)kalloc(sizeof (struct _priv));
                     57:            p->spin_lock = simple_lock_alloc();
                     58:        
                     59:            _priv = p;
                     60:        }
                     61: 
                     62:        simple_lock_init(p->spin_lock);
                     63: 
                     64:        return self;
                     65: }
                     66: 
                     67: - free
                     68: {
                     69:        struct _priv    *p = _priv;
                     70: 
                     71:        if (p) {
                     72:            simple_lock_free(p->spin_lock);
                     73:            kfree(p, sizeof (struct _priv));
                     74:        }
                     75: 
                     76:        return [super free];
                     77: }
                     78: 
                     79: 
                     80: - lock
                     81: {
                     82:        struct _priv    *p = _priv;
                     83: 
                     84:        simple_lock(p->spin_lock);
                     85: 
                     86:        return self;
                     87: }
                     88: 
                     89: - unlock
                     90: {
                     91:        struct _priv    *p = _priv;
                     92: 
                     93:        simple_unlock(p->spin_lock);
                     94: 
                     95:        return self;
                     96: }
                     97: 
                     98: @end

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