;; @file

; InnoTek Portable Runtime - ASMAtomicBitClear().

;

;

; Copyright (C) 2006 InnoTek Systemberatung GmbH

;

; This file is part of VirtualBox Open Source Edition (OSE), as

; available from http://www.virtualbox.org. This file is free software;

; you can redistribute it and/or modify it under the terms of the GNU

; General Public License as published by the Free Software Foundation,

; in version 2 as it comes in the "COPYING" file of the VirtualBox OSE

; distribution. VirtualBox OSE is distributed in the hope that it will

; be useful, but WITHOUT ANY WARRANTY of any kind.

;

; If you received this file as part of a commercial VirtualBox

; distribution, then only the terms of your commercial VirtualBox

; license agreement apply instead of the previous paragraph.

;

;*******************************************************************************

;* Header Files *

;*******************************************************************************

%include "iprt/asmdefs.mac"

BEGINCODE

;;

; Atomically clears a bit in a bitmap.

;

; @param rcx pvBitmap Pointer to the bitmap.

; @param edx iBit The bit to toggle set.

; @remark No memory barrier, take care on smp.

;

BEGINPROC_EXPORTED ASMAtomicBitClear

lock btr [rcx], edx

ret

ENDPROC ASMAtomicBitClear