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[mirror_edk2.git] / MdePkg / Library / BaseSynchronizationLib / X64 / InterlockedCompareExchange64.c

/** @file\r
  InterlockedCompareExchange64 function\r
\r
  Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
/**\r
  Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.\r
**/\r
\r
__int64\r
_InterlockedCompareExchange64 (\r
  __int64 volatile  *Destination,\r
  __int64           Exchange,\r
  __int64           Comperand\r
  );\r
\r
#pragma intrinsic(_InterlockedCompareExchange64)\r
\r
/**\r
  Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r
\r
  Performs an atomic compare exchange operation on the 64-bit unsigned integer specified\r
  by Value.  If Value is equal to CompareValue, then Value is set to ExchangeValue and\r
  CompareValue is returned.  If Value is not equal to CompareValue, then Value is returned.\r
  The compare exchange operation must be performed using MP safe mechanisms.\r
\r
  @param  Value         A pointer to the 64-bit value for the compare exchange\r
                        operation.\r
  @param  CompareValue  64-bit value used in compare operation.\r
  @param  ExchangeValue 64-bit value used in exchange operation.\r
\r
  @return The original *Value before exchange.\r
\r
**/\r
UINT64\r
EFIAPI\r
InternalSyncCompareExchange64 (\r
  IN      volatile UINT64  *Value,\r
  IN      UINT64           CompareValue,\r
  IN      UINT64           ExchangeValue\r
  )\r
{\r
  return _InterlockedCompareExchange64 (Value, ExchangeValue, CompareValue);\r
}\r