| | 1 | /* |
| | 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| | 7 | * |
| | 8 | * This file contains Original Code and/or Modifications of Original Code |
| | 9 | * as defined in and that are subject to the Apple Public Source License |
| | 10 | * Version 2.0 (the 'License'). You may not use this file except in |
| | 11 | * compliance with the License. Please obtain a copy of the License at |
| | 12 | * http://www.opensource.apple.com/apsl/ and read it before using this |
| | 13 | * file. |
| | 14 | * |
| | 15 | * The Original Code and all software distributed under the License are |
| | 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| | 20 | * Please see the License for the specific language governing rights and |
| | 21 | * limitations under the License. |
| | 22 | * |
| | 23 | * @APPLE_LICENSE_HEADER_END@ |
| | 24 | */ |
| | 25 | /* |
| | 26 | * Copyright (c) 1999 Apple Computer, Inc. |
| | 27 | * |
| | 28 | * |
| | 29 | * HISTORY |
| | 30 | * |
| | 31 | * wgulland 23 Jul 99 - Bogus implementation! |
| | 32 | */ |
| | 33 | #include <libkern/OSAtomic.h> |
| | 34 | |
| | 35 | #warning Bogus OSCompareAndSwap() for i386 |
| | 36 | int OSCompareAndSwap( UInt32 oldVal, |
| | 37 | UInt32 newVal, UInt32 * addr ) |
| | 38 | { |
| | 39 | /* |
| | 40 | * This should be |
| | 41 | * EAX = oldVal |
| | 42 | * Lock:CMPXCHG addr, newVal |
| | 43 | * But I don't know how to write that. |
| | 44 | */ |
| | 45 | int ok; |
| | 46 | if( (ok = (oldVal == *addr))) |
| | 47 | *addr = newVal; |
| | 48 | return( ok ); |
| | 49 | } |
| | 50 | |
projects / apple / xnu.git / blame_incremental