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49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/** @file
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InterlockedCompareExchange32 function
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Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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/**
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Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
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**/
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long _InterlockedCompareExchange(
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long volatile * Destination,
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long Exchange,
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long Comperand
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);
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#pragma intrinsic(_InterlockedCompareExchange)
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/**
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Performs an atomic compare exchange operation on a 32-bit unsigned integer.
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Performs an atomic compare exchange operation on the 32-bit unsigned integer
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specified by Value. If Value is equal to CompareValue, then Value is set to
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ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
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then Value is returned. The compare exchange operation must be performed using
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MP safe mechanisms.
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@param Value A pointer to the 32-bit value for the compare exchange
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operation.
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@param CompareValue 32-bit value used in compare operation.
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@param ExchangeValue 32-bit value used in exchange operation.
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@return The original *Value before exchange.
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**/
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UINT32
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EFIAPI
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InternalSyncCompareExchange32 (
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IN volatile UINT32 *Value,
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IN UINT32 CompareValue,
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IN UINT32 ExchangeValue
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)
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{
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return _InterlockedCompareExchange (Value, ExchangeValue, CompareValue);
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}
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