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49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
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/** @file
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InterlockedCompareExchange16 function
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Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2015, Linaro Ltd. 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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__int16 _InterlockedCompareExchange16(
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__int16 volatile * Destination,
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__int16 Exchange,
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__int16 Comperand
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);
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#pragma intrinsic(_InterlockedCompareExchange16)
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/**
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Performs an atomic compare exchange operation on a 16-bit unsigned integer.
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Performs an atomic compare exchange operation on the 16-bit unsigned integer specified
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by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and
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CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.
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The compare exchange operation must be performed using MP safe mechanisms.
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@param Value A pointer to the 16-bit value for the compare exchange
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operation.
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@param CompareValue 16-bit value used in compare operation.
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@param ExchangeValue 16-bit value used in exchange operation.
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@return The original *Value before exchange.
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**/
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UINT16
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EFIAPI
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InternalSyncCompareExchange16 (
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IN volatile UINT16 *Value,
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IN UINT16 CompareValue,
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IN UINT16 ExchangeValue
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)
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{
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return _InterlockedCompareExchange16 (Value, ExchangeValue, CompareValue);
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}
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