MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange32.c File Reference


Functions

UINT32 EFIAPI InternalSyncCompareExchange32 (IN UINT32 *Value, IN UINT32 CompareValue, IN UINT32 ExchangeValue)

Detailed Description

InterlockedCompareExchange32 function

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Function Documentation

UINT32 EFIAPI InternalSyncCompareExchange32 ( IN UINT32 Value,
IN UINT32  CompareValue,
IN UINT32  ExchangeValue 
)

Performs an atomic compare exchange operation on a 32-bit unsigned integer.

Performs an atomic compare exchange operation on the 32-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 32-bit value for the compare exchange operation.
CompareValue 32-bit value used in compare operation.
ExchangeValue 32-bit value used in exchange operation.
Returns:
The original *Value before exchange.

References eax, ecx, edx, and mov.


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