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Annotation of driverkit/libDriver/User/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, user version.
                     27:  *
                     28:  * HISTORY
                     29:  * 22-Apr-91    Doug Mitchell at NeXT
                     30:  *      Created. 
                     31:  */
                     32: 
                     33: 
                     34: #import <machkit/NXLock.h>
                     35: #import <mach/cthreads.h>
                     36: 
                     37: @implementation NXSpinLock  
                     38: 
                     39: /*
                     40:  * _priv instance variable points to one of these.
                     41:  */
                     42: typedef struct {
                     43:        struct mutex            m;
                     44: } spinlock_priv_t;
                     45: 
                     46: - init
                     47: {
                     48:        spinlock_priv_t *priv = _priv = malloc(sizeof(spinlock_priv_t));
                     49: 
                     50:        [super init];
                     51:        mutex_init(&priv->m);
                     52:        return self;
                     53: }
                     54: 
                     55: - free {
                     56:        spinlock_priv_t *priv = _priv;
                     57: 
                     58:        mutex_clear(&priv->m);
                     59:        free(priv);
                     60:        return [super free];
                     61: }
                     62: 
                     63: - lock {
                     64:        spinlock_priv_t *priv = _priv;
                     65: 
                     66:        mutex_lock(&priv->m);
                     67:        return self;
                     68: }
                     69: 
                     70: - unlock {
                     71:        spinlock_priv_t *priv = _priv;
                     72: 
                     73:        mutex_unlock(&priv->m);
                     74:        return self;
                     75: }
                     76: @end
                     77: 

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