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3eb9473e | 1 | /*++\r |
2 | \r | |
2c7e5c2f HT |
3 | Copyright (c) 2004 - 2006, Intel Corporation. All rights reserved.<BR>\r |
4 | This program and the accompanying materials \r | |
3eb9473e | 5 | are licensed and made available under the terms and conditions of the BSD License \r |
6 | which accompanies this distribution. The full text of the license may be found at \r | |
7 | http://opensource.org/licenses/bsd-license.php \r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
11 | \r | |
12 | \r | |
13 | Module Name:\r | |
14 | \r | |
15 | Synchronization.c\r | |
16 | \r | |
17 | Abstract: \r | |
18 | \r | |
19 | --*/\r | |
20 | \r | |
c7f33ca4 | 21 | #include "BaseLibInternals.h"\r |
3eb9473e | 22 | \r |
23 | /**\r | |
24 | Performs an atomic increment of an 32-bit unsigned integer.\r | |
25 | \r | |
26 | Performs an atomic increment of the 32-bit unsigned integer specified by\r | |
27 | Value and returns the incremented value. The increment operation must be\r | |
28 | performed using MP safe mechanisms. The state of the return value is not\r | |
29 | guaranteed to be MP safe.\r | |
30 | \r | |
31 | @param Value A pointer to the 32-bit value to increment.\r | |
32 | \r | |
33 | @return The incremented value.\r | |
34 | \r | |
35 | **/\r | |
36 | UINT32\r | |
37 | EFIAPI\r | |
38 | InternalSyncIncrement (\r | |
39 | IN volatile UINT32 *Value\r | |
40 | )\r | |
41 | {\r | |
42 | UINT32 OriginalValue;\r | |
43 | \r | |
44 | do {\r | |
45 | OriginalValue = *Value;\r | |
46 | } while (OriginalValue != InternalSyncCompareExchange32 (\r | |
47 | Value,\r | |
48 | OriginalValue,\r | |
49 | OriginalValue + 1\r | |
50 | ));\r | |
51 | return OriginalValue + 1;\r | |
52 | }\r | |
53 | \r | |
54 | /**\r | |
55 | Performs an atomic decrement of an 32-bit unsigned integer.\r | |
56 | \r | |
57 | Performs an atomic decrement of the 32-bit unsigned integer specified by\r | |
58 | Value and returns the decrement value. The decrement operation must be\r | |
59 | performed using MP safe mechanisms. The state of the return value is not\r | |
60 | guaranteed to be MP safe.\r | |
61 | \r | |
62 | @param Value A pointer to the 32-bit value to decrement.\r | |
63 | \r | |
64 | @return The decrement value.\r | |
65 | \r | |
66 | **/\r | |
67 | UINT32\r | |
68 | EFIAPI\r | |
69 | InternalSyncDecrement (\r | |
70 | IN volatile UINT32 *Value\r | |
71 | )\r | |
72 | {\r | |
73 | UINT32 OriginalValue;\r | |
74 | \r | |
75 | do {\r | |
76 | OriginalValue = *Value;\r | |
77 | } while (OriginalValue != InternalSyncCompareExchange32 (\r | |
78 | Value,\r | |
79 | OriginalValue,\r | |
80 | OriginalValue - 1\r | |
81 | ));\r | |
82 | return OriginalValue - 1;\r | |
83 | }\r |