/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1999 Apple Computer, Inc. * * * HISTORY * * wgulland 23 Jul 99 - Bogus implementation! */ #include <libkern/OSAtomic.h> #warning Bogus OSCompareAndSwap() for i386 int OSCompareAndSwap( UInt32 oldVal, UInt32 newVal, UInt32 * addr ) { /* * This should be * EAX = oldVal * Lock:CMPXCHG addr, newVal * But I don't know how to write that. */ int ok; if( (ok = (oldVal == *addr))) *addr = newVal; return( ok ); }