[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / InterlockedCompareExchange32.c

/** @file\r
  InterlockedCompareExchange32 function\r
\r
  Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
UINT32\r
EFIAPI\r
InternalSyncCompareExchange32 (\r
  IN      UINT32                    *Value,\r
  IN      UINT32                    CompareValue,\r
  IN      UINT32                    ExchangeValue\r
  )\r
{\r
  _asm {\r
    mov     ecx, Value\r
    mov     eax, CompareValue\r
    mov     edx, ExchangeValue\r
    lock    cmpxchg [ecx], edx\r
  }\r
}\r
\r
Commit	Line	Data
23086ba8	1	/** @file\r
	2	InterlockedCompareExchange32 function\r
	3	\r
e5f461a8	4	Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
23086ba8	5	All rights reserved. This program and the accompanying materials\r
	6	are licensed and made available under the terms and conditions of the BSD License\r
	7	which accompanies this distribution. The full text of the license may be found at\r
	8	http://opensource.org/licenses/bsd-license.php\r
	9	\r
	10	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	12	\r
	13	**/\r
	14	\r
23086ba8	15	UINT32\r
	16	EFIAPI\r
	17	InternalSyncCompareExchange32 (\r
	18	IN UINT32 *Value,\r
	19	IN UINT32 CompareValue,\r
	20	IN UINT32 ExchangeValue\r
	21	)\r
	22	{\r
	23	_asm {\r
	24	mov ecx, Value\r
	25	mov eax, CompareValue\r
	26	mov edx, ExchangeValue\r
	27	lock cmpxchg [ecx], edx\r
	28	}\r
	29	}\r
	30	\r