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1 | /** @file\r | |
2 | InterlockedDecrement function\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2007, 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 | // Include common header file for this module.\r | |
17 | //\r | |
18 | \r | |
19 | \r | |
20 | /**\r | |
21 | Performs an atomic decrement of an 32-bit unsigned integer.\r | |
22 | \r | |
23 | Performs an atomic decrement of the 32-bit unsigned integer specified by\r | |
24 | Value and returns the decrement value. The decrement operation must be\r | |
25 | performed using MP safe mechanisms. The state of the return value is not\r | |
26 | guaranteed to be MP safe.\r | |
27 | \r | |
28 | @param Value A pointer to the 32-bit value to decrement.\r | |
29 | \r | |
30 | @return The decrement value.\r | |
31 | \r | |
32 | **/\r | |
33 | UINT32\r | |
34 | EFIAPI\r | |
35 | InternalSyncDecrement (\r | |
36 | IN UINT32 *Value\r | |
37 | )\r | |
38 | {\r | |
39 | _asm {\r | |
40 | mov eax, Value\r | |
41 | lock dec dword ptr [eax]\r | |
42 | mov eax, [eax]\r | |
43 | }\r | |
44 | }\r |