MdePkg/Library/BaseLib/Ia32/InterlockedCompareExchange32.c


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/** @file
  InterlockedCompareExchange32 function

  Copyright (c) 2006 - 2007, Intel Corporation<BR>
  All rights reserved. This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

UINT32
EFIAPI
InternalSyncCompareExchange32 (
  IN      UINT32                    *Value,
  IN      UINT32                    CompareValue,
  IN      UINT32                    ExchangeValue
  )
{
  _asm {
    mov     ecx, Value
    mov     eax, CompareValue
    mov     edx, ExchangeValue
    lock    cmpxchg [ecx], edx
  }
}