Return to NXLock.m CVS log

Up to [Apple Darwin 0.x] / driverkit / libDriver / Kernel

Annotation of driverkit/libDriver/Kernel/NXLock.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: /*     Copyright (c) 1991 NeXT Computer, Inc.  All rights reserved. 
        !            25:  *
        !            26:  * NXLock.m. Standard lock object, kernel version.
        !            27:  *
        !            28:  * HISTORY
        !            29:  * 01-Aug-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:     lock_t             sleep_lock;
        !            45: };
        !            46: 
        !            47: @implementation NXLock 
        !            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->sleep_lock = lock_alloc();       
        !            58: 
        !            59:            _priv = p;
        !            60:        }
        !            61:        
        !            62:        lock_init(p->sleep_lock, TRUE);
        !            63: 
        !            64:        return self;
        !            65: }
        !            66: 
        !            67: - free
        !            68: {
        !            69:        struct _priv    *p = _priv;
        !            70: 
        !            71:        if (p) {
        !            72:            lock_free(p->sleep_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:        lock_write(p->sleep_lock);
        !            85: 
        !            86:        return self;
        !            87: }
        !            88: 
        !            89: - unlock 
        !            90: {
        !            91:        struct _priv    *p = _priv;
        !            92: 
        !            93:        lock_done(p->sleep_lock); 
        !            94: 
        !            95:        return self;
        !            96: }
        !            97: 
        !            98: @end

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.