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9b89163e AB |
1 | /** @file\r |
2 | InterlockedCompareExchange16 function\r | |
3 | \r | |
4cee954e | 4 | Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r |
9b89163e | 5 | Copyright (c) 2015, Linaro Ltd. All rights reserved.<BR>\r |
9344f092 | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
9b89163e AB |
7 | \r |
8 | **/\r | |
9 | \r | |
10 | /**\r | |
11 | Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.\r | |
12 | **/\r | |
13 | \r | |
14 | __int16 _InterlockedCompareExchange16(\r | |
15 | __int16 volatile * Destination,\r | |
16 | __int16 Exchange,\r | |
17 | __int16 Comperand\r | |
18 | );\r | |
19 | \r | |
20 | #pragma intrinsic(_InterlockedCompareExchange16)\r | |
21 | \r | |
22 | /**\r | |
23 | Performs an atomic compare exchange operation on a 16-bit unsigned integer.\r | |
24 | \r | |
25 | Performs an atomic compare exchange operation on the 16-bit unsigned integer specified\r | |
26 | by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and\r | |
27 | CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.\r | |
28 | The compare exchange operation must be performed using MP safe mechanisms.\r | |
29 | \r | |
30 | @param Value A pointer to the 16-bit value for the compare exchange\r | |
31 | operation.\r | |
32 | @param CompareValue 16-bit value used in compare operation.\r | |
33 | @param ExchangeValue 16-bit value used in exchange operation.\r | |
34 | \r | |
35 | @return The original *Value before exchange.\r | |
36 | \r | |
37 | **/\r | |
38 | UINT16\r | |
39 | EFIAPI\r | |
40 | InternalSyncCompareExchange16 (\r | |
4cee954e | 41 | IN volatile UINT16 *Value,\r |
9b89163e AB |
42 | IN UINT16 CompareValue,\r |
43 | IN UINT16 ExchangeValue\r | |
44 | )\r | |
45 | {\r | |
46 | return _InterlockedCompareExchange16 (Value, ExchangeValue, CompareValue);\r | |
47 | }\r | |
48 | \r |