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Annotation of kernel/driverkit/KernLock.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: /*
        !            26:  * Copyright (c) 1994 NeXT Computer, Inc.
        !            27:  *
        !            28:  * Kernel generic lock object.
        !            29:  *
        !            30:  * HISTORY
        !            31:  *
        !            32:  * 4 July 1994 ? at NeXT
        !            33:  *     Created.
        !            34:  */
        !            35: 
        !            36: #import <cpus.h>
        !            37: 
        !            38: #import <mach/mach_types.h>
        !            39: 
        !            40: #import <driverkit/KernLock.h>
        !            41: 
        !            42: @implementation KernLock
        !            43: 
        !            44: - initWithLevel:       (int)level
        !            45: {
        !            46: #if    NCPUS > 1
        !            47:     _slock = simple_lock_alloc();
        !            48:     simple_lock_init(_slock);
        !            49: #else
        !            50:     if (level == 0)
        !            51:        return [super free];
        !            52: #endif
        !            53: 
        !            54:     _lockLevel = level;
        !            55:     
        !            56:     return self;
        !            57: }
        !            58: 
        !            59: - init
        !            60: {
        !            61:     return [self initWithLevel:0];
        !            62: }
        !            63: 
        !            64: - free
        !            65: {
        !            66: #if    NCPUS > 1
        !            67:     simple_lock_free(_slock);
        !            68: #endif
        !            69:     
        !            70:     return [super free];
        !            71: }
        !            72: 
        !            73: - (int)level
        !            74: {
        !            75:     return _lockLevel;
        !            76: }
        !            77: 
        !            78: - (void)acquire
        !            79: {
        !            80:     int                oldLevel = curipl();
        !            81:     
        !            82:     if (oldLevel < _lockLevel)
        !            83:        spln(ipltospl(_lockLevel));
        !            84: 
        !            85: #if    NCPUS > 1       
        !            86:     simple_lock(_slock);
        !            87: #endif
        !            88:     _savedLevel = oldLevel;
        !            89: }
        !            90: 
        !            91: - (void)release
        !            92: {
        !            93:     int                oldLevel = _savedLevel;
        !            94: 
        !            95: #if    NCPUS > 1    
        !            96:     simple_unlock(_slock);
        !            97: #endif
        !            98:     spln(ipltospl(oldLevel));
        !            99: }
        !           100: 
        !           101: @end
        !           102: 
        !           103: typedef struct KernLock_ {
        !           104:     @defs(KernLock)
        !           105: } KernLock_;
        !           106: 
        !           107: void
        !           108: KernLockAcquire(
        !           109:     KernLock           *_lock
        !           110: )
        !           111: {
        !           112:     KernLock_          *lock = (KernLock_ *)_lock;
        !           113:     int                        oldLevel = curipl();
        !           114:     
        !           115:     if (_lock == nil)
        !           116:        return;
        !           117:     
        !           118:     if (oldLevel < lock->_lockLevel)
        !           119:        spln(ipltospl(lock->_lockLevel));
        !           120: 
        !           121: #if    NCPUS > 1       
        !           122:     simple_lock(lock->_slock);
        !           123: #endif
        !           124:     lock->_savedLevel = oldLevel;
        !           125: }
        !           126: 
        !           127: void
        !           128: KernLockRelease(
        !           129:     KernLock           *_lock
        !           130: )
        !           131: {
        !           132:     KernLock_          *lock = (KernLock_ *)_lock;
        !           133:     int                        oldLevel;
        !           134:     
        !           135:     if (_lock == nil)
        !           136:        return;
        !           137: 
        !           138:     oldLevel = lock->_savedLevel;
        !           139: 
        !           140: #if    NCPUS > 1    
        !           141:     simple_unlock(lock->_slock);
        !           142: #endif
        !           143:     spln(ipltospl(oldLevel));
        !           144: }

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