1 /** @file 2 InterlockedCompareExchange64 function 3 4 Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 /** 16 Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics. 17 **/ 18 19 __int64 _InterlockedCompareExchange64( 20 __int64 volatile * Destination, 21 __int64 Exchange, 22 __int64 Comperand 23 ); 24 25 #pragma intrinsic(_InterlockedCompareExchange64) 26 27 /** 28 Performs an atomic compare exchange operation on a 64-bit unsigned integer. 29 30 Performs an atomic compare exchange operation on the 64-bit unsigned integer specified 31 by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and 32 CompareValue is returned. If Value is not equal to CompareValue, then Value is returned. 33 The compare exchange operation must be performed using MP safe mechanisms. 34 35 @param Value A pointer to the 64-bit value for the compare exchange 36 operation. 37 @param CompareValue 64-bit value used in compare operation. 38 @param ExchangeValue 64-bit value used in exchange operation. 39 40 @return The original *Value before exchange. 41 42 **/ 43 UINT64 44 EFIAPI 45 InternalSyncCompareExchange64 ( 46 IN volatile UINT64 *Value, 47 IN UINT64 CompareValue, 48 IN UINT64 ExchangeValue 49 ) 50 { 51 return _InterlockedCompareExchange64 (Value, ExchangeValue, CompareValue); 52 } 53 54
