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1 | /** @file\r | |
2 | InterlockedCompareExchange32 function\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2008, Intel Corporation<BR>\r | |
5 | All rights reserved. This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | /**\r | |
16 | Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.\r | |
17 | **/\r | |
18 | \r | |
19 | long _InterlockedCompareExchange(\r | |
20 | long volatile * Destination,\r | |
21 | long Exchange,\r | |
22 | long Comperand\r | |
23 | );\r | |
24 | \r | |
25 | #pragma intrinsic(_InterlockedCompareExchange)\r | |
26 | \r | |
27 | /**\r | |
28 | Performs an atomic compare exchange operation on a 32-bit unsigned integer.\r | |
29 | \r | |
30 | Performs an atomic compare exchange operation on the 32-bit unsigned integer\r | |
31 | specified by Value. If Value is equal to CompareValue, then Value is set to\r | |
32 | ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,\r | |
33 | then Value is returned. The compare exchange operation must be performed using\r | |
34 | MP safe mechanisms.\r | |
35 | \r | |
36 | @param Value A pointer to the 32-bit value for the compare exchange\r | |
37 | operation.\r | |
38 | @param CompareValue 32-bit value used in compare operation.\r | |
39 | @param ExchangeValue 32-bit value used in exchange operation.\r | |
40 | \r | |
41 | @return The original *Value before exchange.\r | |
42 | \r | |
43 | **/\r | |
44 | UINT32\r | |
45 | EFIAPI\r | |
46 | InternalSyncCompareExchange32 (\r | |
47 | IN UINT32 *Value,\r | |
48 | IN UINT32 CompareValue,\r | |
49 | IN UINT32 ExchangeValue\r | |
50 | )\r | |
51 | {\r | |
52 | return _InterlockedCompareExchange (Value, ExchangeValue, CompareValue);\r | |
53 | }\r | |
54 | \r |