MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c File Reference


Functions

UINT64 EFIAPI InternalSyncCompareExchange64 (IN UINT64 *Value, IN UINT64 CompareValue, IN UINT64 ExchangeValue)

Detailed Description

InterlockedCompareExchange64 function

Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.
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Function Documentation

UINT64 EFIAPI InternalSyncCompareExchange64 ( IN UINT64 Value,
IN UINT64  CompareValue,
IN UINT64  ExchangeValue 
)

Performs an atomic compare exchange operation on a 64-bit unsigned integer.

Performs an atomic compare exchange operation on the 64-bit unsigned integer specified by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue, then Value is returned. The compare exchange operation must be performed using MP safe mechanisms.

Parameters:
Value A pointer to the 64-bit value for the compare exchange operation.
CompareValue A 64-bit value used in a compare operation.
ExchangeValue A 64-bit value used in an exchange operation.
Returns:
The original *Value before exchange.

References eax, ebx, ecx, edx, and mov.


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