MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c File Reference


Functions

UINT16 EFIAPI InternalSyncCompareExchange16 (IN UINT16 *Value, IN UINT16 CompareValue, IN UINT16 ExchangeValue)

Detailed Description

InterlockedCompareExchange16 function

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Copyright (c) 2015, Linaro Ltd. All rights reserved.
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Function Documentation

UINT16 EFIAPI InternalSyncCompareExchange16 ( IN UINT16 Value,
IN UINT16  CompareValue,
IN UINT16  ExchangeValue 
)

Performs an atomic compare exchange operation on a 16-bit unsigned integer.

Performs an atomic compare exchange operation on the 16-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 16-bit value for the compare exchange operation.
CompareValue 16-bit value used in compare operation.
ExchangeValue 16-bit value used in exchange operation.
Returns:
The original *Value before exchange.

References ax, dx, ecx, and mov.


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