]>
Commit | Line | Data |
---|---|---|
61eb22d3 | 1 | /* Low-level functions for atomitc operations. Stub version. |
9a0a462c | 2 | Copyright (C) 1997 Free Software Foundation, Inc. |
4cca6b86 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
9a0a462c UD |
20 | #ifndef _ATOMICITY_H |
21 | #define _ATOMICITY_H 1 | |
4cca6b86 | 22 | |
9a0a462c | 23 | #include <inttypes.h> |
4cca6b86 | 24 | |
9a0a462c UD |
25 | |
26 | static inline int | |
27 | __attribute__ ((unused)) | |
28 | exchange_and_add (uint32_t *mem, int val) | |
29 | { | |
30 | int result = *mem; | |
31 | *mem += val; | |
32 | return result; | |
33 | } | |
34 | ||
35 | static inline void | |
36 | __attribute__ ((unused)) | |
37 | atomic_add (uint32_t *mem, int val) | |
38 | { | |
39 | *mem += val; | |
40 | } | |
41 | ||
42 | static inline int | |
43 | __attribute__ ((unused)) | |
44 | compare_and_swap (long int *p, long int oldval, long int newval) | |
45 | { | |
46 | if (*p != oldval) | |
47 | return 0; | |
48 | ||
49 | *p = newval; | |
50 | return 1; | |
51 | } | |
52 | ||
53 | #endif /* atomicity.h */ |